From 71f9ebaed717f24958b087a666842f6da8cd933b Mon Sep 17 00:00:00 2001
From: trilader <trilader@schroedingers-bit.net>
Date: Sun, 22 Nov 2020 16:17:14 +0100
Subject: [PATCH] Initial commit

---
 .gitignore         |   4 +
 main.cpp           | 634 +++++++++++++++++++++++++++++++++++++++++++++
 tui.cpp            | 537 ++++++++++++++++++++++++++++++++++++++
 tui.h              |  74 ++++++
 yt-tool-tui.pro    |  23 ++
 yt.cpp             | 266 +++++++++++++++++++
 yt.h               |  55 ++++
 yttui.conf.example |   6 +
 8 files changed, 1599 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 main.cpp
 create mode 100644 tui.cpp
 create mode 100644 tui.h
 create mode 100644 yt-tool-tui.pro
 create mode 100644 yt.cpp
 create mode 100644 yt.h
 create mode 100644 yttui.conf.example

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..84e1d89
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+*.conf
+*.sqlite
+*.pro.user
+build-*/
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..183e07c
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,634 @@
+#define _X_OPEN_SOURCE
+
+#include "tui.h"
+#include "yt.h"
+
+#include <algorithm>
+#include <cstdlib>
+#include <cstring>
+#include <ctime>
+#include <unordered_map>
+#include <fstream>
+
+#include <time.h>
+#include <stdio.h>
+
+#include <curl/curl.h>
+#include <nlohmann/json.hpp>
+#include <sqlite3.h>
+
+static std::string user_home;
+
+std::vector<Channel> channels;
+std::unordered_map<std::string, std::vector<Video>> videos;
+
+std::optional<size_t> selected_channel;
+size_t current_video_count = 0;
+size_t selected_video = 0;
+size_t videos_per_page = 0;
+size_t current_page_count = 0;
+size_t title_offset = 0;
+bool any_title_in_next_half = false;
+
+#define SC(x) { const int res = (x); if(res != SQLITE_OK && res != SQLITE_ROW && res != SQLITE_DONE) { fprintf(stderr, "%s failed: (%d) %s\n", #x, res, sqlite3_errstr(res)); std::abort(); }}
+
+static termpaint_attr* get_attr(const AttributeSetType type, const bool highlight=false)
+{
+    return highlight ? attributes[type].highlight : attributes[type].normal;
+}
+
+void draw_channel_list(const std::vector<Video> &videos)
+{
+    const size_t cols = termpaint_surface_width(surface);
+    const size_t rows = termpaint_surface_height(surface);
+
+    const size_t column_spacing = 2;
+
+    const size_t status_column = 0;
+    const size_t status_width = 1;
+
+    const size_t date_column = status_column + status_width + column_spacing;
+    const size_t date_width = std::string("xxxx-xx-xx xx:xx").size();
+    const size_t first_name_column = date_column + date_width + column_spacing;
+    const size_t last_name_column = cols;
+    const size_t name_quater = (last_name_column - first_name_column) / 4;
+
+    const size_t start_row = 2;
+    const size_t available_rows = rows - 2;
+    videos_per_page = available_rows;
+
+    const int pages = videos.size() / available_rows;
+    const int cur_page = selected_video / available_rows;
+
+    const std::string channel_name = std::string("Channel: ") + channels[*selected_channel].name.c_str();
+    termpaint_surface_write_with_attr(surface, 0, 0, channel_name.c_str(), get_attr(ASNormal));
+
+    if(pages > 1) {
+        std::string text = "(Page " + std::to_string(cur_page + 1) + "/" + std::to_string(pages + 1) + ")";
+        const size_t w = string_width(text);
+        termpaint_surface_write_with_attr(surface, cols - w, 0, text.c_str(), attributes[ASNormal].normal);
+    }
+
+    termpaint_surface_write_with_attr(surface, date_column, 1, "Date", get_attr(ASNormal));
+    termpaint_surface_write_with_attr(surface, first_name_column, 1, "Title", get_attr(ASNormal));
+
+    any_title_in_next_half = false;
+
+    size_t cur_entry = 0;
+    for(size_t i = cur_page*available_rows; i < videos.size(); i++) {
+        const size_t row = start_row + cur_entry;
+        const bool selected = i == selected_video;
+        const Video &video = videos.at(i);
+        termpaint_attr *attr = get_attr(video.flags & kWatched ? ASWatched : ASUnwatched, selected);
+
+        termpaint_surface_clear_rect_with_attr(surface, 0, row, cols, 1, attr);
+
+        std::vector<char> dt(date_width + 10, 0);
+
+        struct tm tm;
+        memset(&tm, 0, sizeof(tm));
+        if(strptime(video.published.c_str(), "%FT%T%z", &tm) != nullptr) {
+            strftime(dt.data(), date_width + 10, "%F %H:%M", &tm);
+        }
+
+        termpaint_surface_write_with_attr(surface, date_column, row, dt.data(), attr);
+
+        bool in_this_quater = title_offset * name_quater < video.tui_title_width;
+        any_title_in_next_half = any_title_in_next_half || ((title_offset + 2) * name_quater) < video.tui_title_width;
+        if(in_this_quater)
+            termpaint_surface_write_with_attr_clipped(surface, first_name_column, row, video.title.c_str() + (name_quater * title_offset), attr, first_name_column, last_name_column);
+        else
+            termpaint_surface_write_with_attr(surface, first_name_column, row, "←", attr);
+        std::string status_symbol = "";
+        if(video.flags & kWatched) {
+            status_symbol = "*";
+        }
+        if(video.flags & kDownloaded) {
+            status_symbol = "↓";
+        }
+        termpaint_surface_write_with_attr(surface, status_column, row, status_symbol.c_str(), attr);
+
+        if(++cur_entry > available_rows)
+            break;
+    }
+
+    if(!any_title_in_next_half && title_offset > 0)
+        title_offset--;
+}
+
+void draw_no_channels_msg()
+{
+    const size_t cols = termpaint_surface_width(surface);
+    const size_t rows = termpaint_surface_height(surface);
+
+    const std::string text("No configured channels.\n"
+                           "Press the following keys to add one:\n"
+                           "a    Add by name\n"
+                           "A    Add by ID\n"
+                           "Or press h for help or ^q to quit.");
+    {
+        std::pair<size_t, size_t> size = string_size(text);
+        write_multiline_string((cols - size.first) / 2, (rows - size.second) / 2, text, get_attr(ASNormal));
+    }
+}
+
+static void pad_to_width(std::string &str, const size_t width)
+{
+    const size_t current = string_width(str);
+    str.append(width-current, ' ');
+}
+
+struct action
+{
+    int type;
+    std::string string;
+    int modifier;
+
+    std::function<void(void)> func;
+    const std::string help;
+};
+
+struct helpitem {
+    std::string key;
+    std::string text;
+};
+
+void draw_help(const std::vector<helpitem> &items)
+{
+    const size_t rows = termpaint_surface_height(surface);
+
+    const size_t rows_per_column = rows / 3 * 2;
+
+    std::vector<std::vector<std::string>> column_texts;
+
+    const size_t text_columns = 1 + items.size() / rows_per_column;
+
+    size_t item = 0;
+    for(size_t column=0; column<text_columns; column++) {
+        const size_t items_this_column = std::min(items.size() - item, rows_per_column);
+        std::vector<std::string> texts;
+        size_t key_width = 0;
+        size_t text_width = 0;
+        for(size_t i=0; i<items_this_column; i++) {
+            key_width = std::max(string_width(items[item + i].key), key_width);
+            text_width = std::max(string_width(items[item + i].text), text_width);
+        }
+        for(size_t i=0; i<items_this_column; i++) {
+            std::string s = items[item].key;
+            pad_to_width(s, key_width);
+            s.append(" ");
+            s.append(items[item].text);
+            pad_to_width(s, key_width + 1 + text_width);
+            texts.push_back(s);
+
+            item++;
+        }
+        column_texts.push_back(texts);
+    }
+
+    std::string to_show;
+    for(size_t i=0; i<rows_per_column; i++) {
+        for(size_t column=0; column<text_columns; column++) {
+            if(i >= column_texts[column].size())
+                continue;
+            to_show.append(column_texts[column][i]);
+            if(column+1 < text_columns)
+                to_show.append(" ");
+        }
+        to_show.append("\n");
+    }
+
+    message_box("Help", to_show.c_str());
+}
+
+static std::unordered_map<std::string, std::string> key_symbols = {
+    {"ArrowLeft", "←"},
+    {"ArrowUp", "↑"},
+    {"ArrowRight", "→"},
+    {"ArrowDown", "↓"},
+    {"Space", "[Space]"},
+};
+
+std::string format_key(const action &action) {
+    std::string str;
+    if(action.modifier & TERMPAINT_MOD_CTRL)
+        str.append("C-");
+    if(action.modifier & TERMPAINT_MOD_ALT)
+        str.append("M-");
+    if(action.type == TERMPAINT_EV_KEY) {
+        auto it = key_symbols.find(action.string);
+        if(it == key_symbols.end())
+            str.append(action.string);
+        else
+            str.append(it->second);
+    } else {
+        str.append(action.string);
+    }
+    return str;
+}
+
+bool handle_action(const Event &event, const std::vector<action> &actions)
+{
+    if(event.type == EV_TIMEOUT)
+        return false;
+
+    const auto it = std::find_if(actions.cbegin(), actions.cend(), [&](const action &a) {
+        return a.type == event.type
+                && a.string == event.string
+                && event.modifier == a.modifier;
+    });
+    if(it == actions.cend()) {
+        if(event.type == TERMPAINT_EV_KEY && event.string == "F1") {
+            std::vector<helpitem> items = {{"F1", "Display this help"}};
+            for(const action &action: actions) {
+                if(action.help.empty())
+                    continue;
+                items.push_back({format_key(action), action.help});
+            }
+            draw_help(items);
+        }
+        return false;
+    }
+    if(it->func)
+        it->func();
+    return true;
+}
+
+sqlite3 *db;
+
+void load_videos_for_channel(const std::string &channelId, bool force=false)
+{
+    if(videos.find(channelId) != videos.end() && !force)
+        return;
+    std::vector<Video> &channelVideos = videos[channelId];
+    channelVideos.clear();
+    if(channels[*selected_channel].id == channelId)
+        selected_video = 0;
+
+    sqlite3_stmt *query;
+    SC(sqlite3_prepare_v2(db, "SELECT * FROM videos WHERE channelId=?1 ORDER BY published DESC;", -1, &query, nullptr));
+
+    SC(sqlite3_bind_text(query, 1, channelId.c_str(), -1, SQLITE_TRANSIENT));
+    while(sqlite3_step(query) == SQLITE_ROW) {
+        Video video(query);
+        video.tui_title_width = string_width(video.title);
+        channelVideos.push_back(video);
+    }
+    SC(sqlite3_finalize(query));
+}
+
+void fetch_videos_for_channel(Channel &ch, bool name_in_title=false)
+{
+    std::string title("Refreshing");
+    if(name_in_title)
+        title.append(" ").append(ch.name);
+    title.append("…");
+    progress_info *info = begin_progress(title, 30);
+    ch.fetch_new_videos(db, info);
+    end_progress(info);
+    load_videos_for_channel(channels[*selected_channel].id, true);
+    ch.load_info(db);
+}
+
+void select_channel_by_index(const int index) {
+    selected_channel = index;
+    const Channel &channel = channels.at(*selected_channel);
+    selected_video = 0;
+    current_video_count = channel.video_count;
+    load_videos_for_channel(channel.id);
+}
+
+void select_channel_by_name(const std::string &channel_name) {
+    auto it = std::find_if(channels.cbegin(), channels.cend(), [&](const Channel &channel){ return channel.name == channel_name; });
+    if(it == channels.cend())
+        return;
+    select_channel_by_index(std::distance(channels.cbegin(), it));
+}
+
+void select_channel_by_id(const std::string &channel_id) {
+    auto it = std::find_if(channels.cbegin(), channels.cend(), [&](const Channel &channel){ return channel.id == channel_id; });
+    if(it == channels.cend())
+        return;
+    select_channel_by_index(std::distance(channels.cbegin(), it));
+}
+
+void add_channel_to_list(Channel &channel)
+{
+    channel.load_info(db);
+
+    std::string selected_channel_id;
+    if(selected_channel) {
+        selected_channel_id = channels[*selected_channel].id;
+    }
+
+    channels.push_back(channel);
+    std::sort(channels.begin(), channels.end(), [](const Channel &a, const Channel &b){ return a.name < b.name; });
+
+    if(selected_channel) {
+        const size_t new_index = std::distance(channels.cbegin(), std::find_if(channels.cbegin(), channels.cend(), [&](const Channel &ch){ return ch.id == selected_channel_id; }));
+        selected_channel = new_index;
+    }
+}
+
+void handle_add_channel_by_name()
+{
+    std::string channel_name = get_string("Add new Channel", "Enter channel name");
+    if(channel_name.empty()) {
+        return;
+    } else if(std::find_if(channels.cbegin(), channels.cend(), [&](const Channel &channel){ return channel.name == channel_name; }) != channels.cend()) {
+        message_box("Can't add channel", "A channel with this name is already in the list!");
+        return;
+    } else {
+        Channel ch = Channel::add(db, "forUsername", channel_name);
+        if(ch.is_valid()) {
+            add_channel_to_list(ch);
+            select_channel_by_id(ch.id);
+            tp_flush();
+            if(message_box("Update now?", "Fetch videos for this channel now?", Button::Yes | Button::No, Button::Yes) == Button::Yes) {
+                fetch_videos_for_channel(ch);
+            }
+        } else {
+            message_box("Can't add channel", "There is no channel with this name!");
+        }
+    }
+}
+
+void handle_add_channel_by_id()
+{
+    std::string channel_id = get_string("Add new Channel", "Enter channel ID");
+    if(channel_id.empty()) {
+        return;
+    } else if(std::find_if(channels.cbegin(), channels.cend(), [&](const Channel &channel){ return channel.id == channel_id; }) != channels.cend()) {
+        message_box("Can't add channel", "A channel with this ID is already in the list!");
+        return;
+    } else {
+        Channel ch = Channel::add(db, "id", channel_id);
+        if(ch.is_valid()) {
+            add_channel_to_list(ch);
+            select_channel_by_id(ch.id);
+            tp_flush();
+            if(message_box("Update now?", "Fetch videos for this channel now?", Button::Yes | Button::No, Button::Yes) == Button::Yes) {
+                fetch_videos_for_channel(ch);
+            }
+        } else {
+            message_box("Can't add channel", "There is no channel with this ID!");
+        }
+    }
+}
+
+void handle_watch_video(Video &video, bool mark_only) {
+    const std::string url = "https://youtube.com/watch?v=";
+    const std::string cmd = "xdg-open \"" + url + video.id + "\" > /dev/null";
+    if(!mark_only) {
+        int rc = system(cmd.c_str());
+        if(rc)
+            message_box("Failed to open browser", ("xdg-open failed with error " + std::to_string(rc)).c_str());
+    }
+    video.set_flag(db, kWatched);
+}
+
+void handle_mark_all_videos_watched(Channel &channel) {
+    sqlite3_exec(db, "BEGIN TRANSACTION;", nullptr, nullptr, nullptr);
+    for(Video &video: videos[channel.id]) {
+        video.set_flag(db, kWatched);
+    }
+    sqlite3_exec(db, "COMMIT TRANSACTION;", nullptr, nullptr, nullptr);
+    channel.load_info(db);
+}
+
+void action_select_channel() {
+    if(channels.size()) {
+        std::vector<std::string> names;
+        for(const Channel &c: channels)
+            names.push_back(c.name + " (" + std::to_string(c.unwatched) + ")");
+        const int channel = get_selection("Switch Channel", names, *selected_channel, Align::VCenter | Align::Left);
+        if(channel != -1)
+            select_channel_by_index(channel);
+    } else {
+        message_box("Can't select channel", "No channels configured.\n Please configure one.");
+    }
+}
+
+void action_refresh_channel() {
+    Channel &ch = channels[*selected_channel];
+    fetch_videos_for_channel(ch);
+}
+
+void action_refresh_all_channels() {
+    if(message_box("Refresh all channels?", ("Do you want to refresh all " + std::to_string(channels.size()) + " channels?").c_str(), Button::Yes | Button::No, Button::No) != Button::Yes)
+        return;
+    for(Channel &channel: channels) {
+        fetch_videos_for_channel(channel, true);
+    }
+}
+
+void action_mark_video_watched() {
+    Channel &ch = channels[*selected_channel];
+    Video &video = videos[ch.id][selected_video];
+    video.set_flag(db, kWatched);
+    ch.load_info(db);
+}
+
+void action_watch_video() {
+    Channel &ch = channels[*selected_channel];
+    Video &video = videos[ch.id][selected_video];
+
+    const std::string url = "https://youtube.com/watch?v=";
+    const std::string cmd = "xdg-open \"" + url + video.id + "\" > /dev/null";
+    int rc = system(cmd.c_str());
+    if(rc) {
+        message_box("Failed to open browser", ("xdg-open failed with error " + std::to_string(rc)).c_str());
+    } else {
+        video.set_flag(db, kWatched);
+        ch.load_info(db);
+    }
+}
+
+void action_mark_video_unwatched() {
+    Channel &ch = channels[*selected_channel];
+    Video &selected = videos[ch.id][selected_video];
+    selected.set_flag(db, kWatched, false);
+    ch.load_info(db);
+}
+
+void action_mark_all_videos_watched() {
+    Channel &ch = channels[*selected_channel];
+    if(message_box("Mark all as watched", ("Do you want to mark all videos of " + ch.name + " as watched?").c_str(), Button::Yes | Button::No, Button::No) != Button::Yes)
+        return;
+    handle_mark_all_videos_watched(ch);
+}
+
+void action_select_prev_channel() {
+    if(selected_channel && *selected_channel > 0)
+        select_channel_by_index(*selected_channel - 1);
+}
+
+void action_select_next_channel() {
+    if(selected_channel && *selected_channel < channels.size() - 1)
+        select_channel_by_index(*selected_channel + 1);
+}
+
+void action_select_prev_video() {
+    if(selected_video > 0)
+        selected_video--;
+}
+
+void action_select_next_video() {
+    if(selected_video < current_video_count - 1)
+        selected_video++;
+}
+
+void action_select_prev_video_page() {
+    if(selected_video > 0)
+        selected_video -= std::min(selected_video, videos_per_page);
+}
+
+void action_select_next_video_page() {
+    if(selected_video < current_video_count - 1)
+        selected_video++;
+}
+
+void action_select_first_video() {
+    selected_video = 0;
+}
+
+void action_select_last_video() {
+    selected_video = current_video_count - 1;
+}
+
+void action_scroll_title_left() {
+    if(title_offset > 0)
+        title_offset--;
+}
+
+void action_scroll_title_right() {
+    if(any_title_in_next_half)
+        title_offset++;
+}
+
+void action_show_video_detail() {
+    message_box("Details", "Video details go here...");
+}
+
+using json = nlohmann::json;
+std::optional<json> load_json(const std::string &filename) {
+    std::ifstream ifs(filename);
+    if(!ifs.is_open())
+        return {};
+    try {
+        json data;
+        ifs >> data;
+        return data;
+    } catch (json::parse_error &err) {
+        fprintf(stderr, "Failed to parse JSON file %s: %s\n", filename.c_str(), err.what());
+        return {};
+    }
+}
+
+bool save_json(const std::string &filename, const json &data) {
+    std::ofstream ofs(filename);
+    if(!ofs.is_open())
+        return false;
+    try {
+        ofs << data;
+        return true;
+    }  catch (json::exception &err) {
+        return false;
+    }
+}
+
+int main()
+{
+    user_home = std::string(std::getenv("HOME"));
+    std::vector<std::string> config_locations{user_home + "/.config/", "./"};
+
+    curl_global_init(CURL_GLOBAL_ALL);
+    tp_init();
+
+    nlohmann::json config;
+    for(const std::string &location: config_locations) {
+        std::string config_file(location + "yttui.conf");
+        auto config_data = load_json(config_file);
+        if(config_data) {
+            config = *config_data;
+            fprintf(stderr, "Using config file %s...\n", config_file.c_str());
+            break;
+        } else {
+            fprintf(stderr, "Can't read config file %s...\n", config_file.c_str());
+        }
+    }
+    if(!config.empty()) {
+        if(config.contains("apiKey") && config["apiKey"].is_string()) {
+            yt_config.api_key = config["apiKey"];
+        } else {
+            tui_abort("A YouTube API key is required for this application to function.\n  Please provide one in the config file.");
+        }
+        if(config.contains("extraHeaders") && config["extraHeaders"].is_array()) {
+            for(const json &elem: config["extraHeaders"]) {
+                if(elem.contains("key") && elem["key"].is_string() && elem.contains("value") && elem["value"].is_string()) {
+                    yt_config.extra_headers.emplace(elem["key"], elem["value"]);
+                }
+            }
+        }
+    }
+
+    sqlite3_open("yttool.sqlite", &db);
+
+    sqlite3_stmt *query;
+    sqlite3_prepare_v2(db, "SELECT * FROM channels;", -1, &query, nullptr);
+    while(sqlite3_step(query) == SQLITE_ROW) {
+        Channel channel(query);
+        add_channel_to_list(channel);
+    }
+    sqlite3_finalize(query);
+
+    if(channels.size())
+        select_channel_by_index(0);
+
+    bool exit = false;
+    std::vector<action> actions = {
+        {TERMPAINT_EV_CHAR, "a", 0, handle_add_channel_by_name, "Add channel by name"},
+        {TERMPAINT_EV_CHAR, "A", 0, handle_add_channel_by_id, "Add channel by Id"},
+        {TERMPAINT_EV_CHAR, "c", 0, action_select_channel, "Select channel"},
+        {TERMPAINT_EV_CHAR, "j", 0, action_select_prev_channel, "Select previous channel"},
+        {TERMPAINT_EV_CHAR, "k", 0, action_select_next_channel, "Select next channel"},
+        {TERMPAINT_EV_CHAR, "r", 0, action_refresh_channel, "Refresh selected channel"},
+        {TERMPAINT_EV_CHAR, "R", 0, action_refresh_all_channels, "Refresh all channels"},
+        {TERMPAINT_EV_CHAR, "w", 0, action_watch_video, "Watch video"},
+        {TERMPAINT_EV_CHAR, "w", TERMPAINT_MOD_ALT, action_mark_video_watched, "Mark video as watched"},
+        {TERMPAINT_EV_CHAR, "u", 0, action_mark_video_unwatched, "Mark video as unwatched"},
+        {TERMPAINT_EV_CHAR, "W", 0, action_mark_all_videos_watched, "Mark channel as watched"},
+        {TERMPAINT_EV_CHAR, "q", TERMPAINT_MOD_CTRL, [&](){exit = true;}, "Quit"},
+
+        {TERMPAINT_EV_KEY, "Space", 0, action_show_video_detail, "Show video details"},
+        {TERMPAINT_EV_KEY, "ArrowUp", 0, action_select_prev_video, "Previous video"},
+        {TERMPAINT_EV_KEY, "ArrowDown", 0, action_select_next_video, "Next video"},
+        {TERMPAINT_EV_KEY, "PageUp", 0, action_select_prev_video_page, "Previous video page"},
+        {TERMPAINT_EV_KEY, "PageDown", 0, action_select_next_video_page, "Next video page"},
+        {TERMPAINT_EV_KEY, "Home", 0, action_select_first_video, "First video"},
+        {TERMPAINT_EV_KEY, "End", 0, action_select_last_video, "Last video"},
+        {TERMPAINT_EV_KEY, "ArrowLeft", 0, action_scroll_title_left, "Scroll title left"},
+        {TERMPAINT_EV_KEY, "ArrowRight", 0, action_scroll_title_right, "Scroll title right"},
+    };
+
+    do {
+        termpaint_surface_clear(surface, TERMPAINT_DEFAULT_COLOR, TERMPAINT_DEFAULT_COLOR);
+        if(selected_channel)
+            draw_channel_list(videos[channels.at(*selected_channel).id]);
+        else
+            draw_no_channels_msg();
+        tp_flush();
+
+        auto event = tp_wait_for_event();
+        if(!event)
+            abort();
+
+        handle_action(*event, actions);
+    } while (!exit);
+
+    tp_shutdown();
+    sqlite3_close(db);
+    curl_global_cleanup();
+
+    return 0;
+}
diff --git a/tui.cpp b/tui.cpp
new file mode 100644
index 0000000..b52b8db
--- /dev/null
+++ b/tui.cpp
@@ -0,0 +1,537 @@
+#include "tui.h"
+
+#include <algorithm>
+#include <deque>
+#include <string>
+#include <vector>
+
+termpaint_integration *integration;
+termpaint_terminal *terminal;
+termpaint_surface *surface;
+
+AttributeSet attributes[ASetTypeCount];
+
+std::deque<Event> eventqueue;
+
+static void convert_tp_event(void *, termpaint_event *tp_event) {
+    Event e;
+    if (tp_event->type == TERMPAINT_EV_CHAR) {
+        e.type = tp_event->type;
+        e.modifier = tp_event->c.modifier;
+        e.string = std::string(tp_event->c.string, tp_event->c.length);
+        eventqueue.push_back(e);
+    } else if (tp_event->type == TERMPAINT_EV_KEY) {
+        e.type = tp_event->type;
+        e.modifier = tp_event->key.modifier;
+        e.string = std::string(tp_event->key.atom, tp_event->key.length);
+        eventqueue.push_back(e);
+    }
+}
+
+std::optional<Event> wait_for_event(termpaint_integration *integration, int timeout) {
+    while (eventqueue.empty()) {
+        bool ok = false;
+        if(timeout > 0)
+            ok = termpaintx_full_integration_do_iteration_with_timeout(integration, &timeout);
+        else
+            ok = termpaintx_full_integration_do_iteration(integration);
+        if (!ok) {
+            return {}; // or some other error handling
+        } else if(timeout == 0) {
+            Event e;
+            e.type = EV_TIMEOUT;
+            eventqueue.push_back(e);
+        }
+    }
+    Event e = eventqueue.front();
+    eventqueue.pop_front();
+    return e;
+}
+
+void tp_init()
+{
+    auto new_attr_set = [](AttributeSet &set, int color, int style = 0) {
+        set.normal = termpaint_attr_new(color, TERMPAINT_DEFAULT_COLOR);
+        termpaint_attr_set_style(set.normal, style);
+        set.highlight = termpaint_attr_clone(set.normal);
+        termpaint_attr_set_style(set.highlight, TERMPAINT_STYLE_INVERSE | style);
+    };
+
+    new_attr_set(attributes[ASNormal], TERMPAINT_DEFAULT_COLOR);
+    new_attr_set(attributes[ASWatched], TERMPAINT_DEFAULT_COLOR);
+    new_attr_set(attributes[ASUnwatched], TERMPAINT_DEFAULT_COLOR, TERMPAINT_STYLE_BOLD);
+
+    integration = termpaintx_full_integration_setup_terminal_fullscreen( "+kbdsig +kbdsigint +kbdsigtstp", convert_tp_event, nullptr, &terminal);
+    surface = termpaint_terminal_get_surface(terminal);
+    termpaint_terminal_set_cursor_visible(terminal, false);
+}
+
+void tp_shutdown()
+{
+    auto free_attr_set = [](AttributeSet &set) {
+        termpaint_attr_free(set.normal);
+        termpaint_attr_free(set.highlight);
+    };
+
+    free_attr_set(attributes[ASNormal]);
+    free_attr_set(attributes[ASWatched]);
+    free_attr_set(attributes[ASUnwatched]);
+
+    termpaint_terminal_free_with_restore(terminal);
+}
+
+void tp_flush()
+{
+    termpaint_terminal_flush(terminal, false);
+}
+
+std::optional<Event> tp_wait_for_event()
+{
+    return wait_for_event(integration, 0);
+}
+
+static std::string repeated(const int n, const std::string &what)
+{
+    std::string out;
+    for(int i=0; i<n; i++)
+        out.append(what);
+    return out;
+}
+
+size_t string_width(const std::string &str)
+{
+    termpaint_text_measurement *m = termpaint_text_measurement_new(surface);
+    termpaint_text_measurement_feed_utf8(m, str.c_str(), str.length(), true);
+    const int width = termpaint_text_measurement_last_width(m);
+    termpaint_text_measurement_free(m);
+    return width;
+}
+
+static void resolve_align(const Align align, const int width, const int height, const int xmin, const int xmax, const int ymin, const int ymax, int &x, int &y)
+{
+    int available_width = xmax-xmin;
+    x = xmin;
+    if(((int)align & 0x0f) == (int)Align::HCenter)
+        x = (available_width - width) / 2;
+    else if(((int)align & 0x0f) == (int)Align::Right)
+        x = xmax - width;
+
+    int available_rows = ymax - ymin;
+    y = ymin;
+    if(((int)align & 0xf0) == (int)Align::VCenter)
+        y = (available_rows - height) / 2;
+    else if(((int)align & 0xf0) == (int)Align::Bottom)
+        y = ymax - height;
+}
+
+static void draw_box_with_caption(int x, int y, int w, int h, const std::string &caption=std::string())
+{
+    termpaint_surface_clear_rect(surface, x, y, w, h, TERMPAINT_DEFAULT_COLOR, TERMPAINT_DEFAULT_COLOR);
+    const int fill = w - 2;
+    const int endy = y+h;
+
+    for(int yy = y; yy<endy; yy++)
+    {
+        std::string s;
+        if(yy == y) {
+            s = "┌" + repeated(fill, "─") + "┐";
+        } else if(yy + 1 == endy) {
+            s = "└" + repeated(fill, "─") + "┘";
+        } else {
+            s = "│" + repeated(fill, " ") + "│";
+        }
+        termpaint_surface_write_with_attr(surface, x, yy, s.c_str(), attributes[ASNormal].normal);
+    }
+    if(!caption.empty())
+        termpaint_surface_write_with_attr(surface, x+2, y, caption.c_str(), attributes[ASNormal].normal);
+}
+
+int get_selection(const std::string &caption, const std::vector<std::string> &entries, size_t selected, const Align align)
+{
+    selected = std::max(size_t(0), std::min(entries.size(), selected));
+
+    size_t cols_needed = string_width(caption);
+    for(const auto &e: entries)
+        cols_needed = std::max(cols_needed, string_width(e));
+
+    cols_needed += 4; // Border and left/right padding
+
+    const int rows_needed = entries.size()+2; // Number of entries and top/bottom border
+
+    const int cols = termpaint_surface_width(surface);
+    const int rows = termpaint_surface_height(surface);
+
+    int x, y;
+    resolve_align(align, cols_needed, rows_needed, 0, cols, 0, rows, x, y);
+
+    while (true) {
+        draw_box_with_caption(x, y, cols_needed, rows_needed, caption);
+        int yy = y+1;
+
+        size_t cur_entry = 0;
+        for(const auto &e: entries) {
+            termpaint_attr *attr = cur_entry == selected ? attributes[ASNormal].highlight : attributes[ASNormal].normal;
+            termpaint_surface_write_with_attr(surface, x+2, yy++, e.c_str(), attr);
+            cur_entry++;
+        }
+        termpaint_terminal_flush(terminal, false);
+
+        auto event = wait_for_event(integration, 0);
+        if(!event)
+            abort();
+
+        if(event->type == TERMPAINT_EV_CHAR) {
+            if(event->string.length() == 1) {
+                char c = event->string[0];
+                if(c>'0' && c<='9') {
+                    size_t idx = c - '0';
+                    if(idx > entries.size())
+                        continue;
+                    return idx - 1;
+                }
+            }
+        } else if (event->type == TERMPAINT_EV_KEY) {
+            if (event->string == "Escape") {
+                return -1;
+            } else if(event->string == "ArrowUp") {
+                if(selected > 0)
+                    selected--;
+            } else if(event->string == "ArrowDown") {
+                if(selected < entries.size() - 1)
+                    selected++;
+            } else if(event->string == "Enter" || event->string == "NumpadEnter") {
+                return static_cast<int>(selected);
+            }
+        }
+    }
+
+    return -1;
+}
+
+Align operator|(const Align &a, const Align &b)
+{
+    return Align((int)a | (int)b);
+}
+
+Button operator|(const Button &a, const Button &b)
+{
+    return Button((int)a | (int)b);
+}
+
+Button operator&(const Button &a, const Button &b)
+{
+    return Button((int)a & (int)b);
+}
+
+std::string get_string(const std::string &caption, const std::string &text, const Align align)
+{
+    const int cols = termpaint_surface_width(surface);
+    const int rows = termpaint_surface_height(surface);
+
+    const size_t rows_needed = 3 + !text.empty();
+    const size_t cols_needed = cols/2;
+
+    int x, y;
+    resolve_align(align, cols_needed, rows_needed, 0, cols, 0, rows, x, y);
+
+    const int input_row = y + 1 + !text.empty();
+
+    std::string input;
+    size_t input_pos = 0;
+    termpaint_terminal_set_cursor_visible(terminal, true);
+    termpaint_terminal_set_cursor_style(terminal, TERMPAINT_CURSOR_STYLE_BAR, true);
+
+    while(true) {
+        draw_box_with_caption(x, y, cols_needed, rows_needed, caption);
+        if(!text.empty())
+            termpaint_surface_write_with_attr(surface, x + 1, y + 1, text.c_str(), attributes[ASNormal].normal);
+        termpaint_surface_write_with_attr(surface, x + 1, input_row, input.c_str(), attributes[ASNormal].normal);
+        termpaint_terminal_set_cursor_position(terminal, x + 1 + input_pos, input_row);
+
+        termpaint_terminal_flush(terminal, false);
+
+        auto event = wait_for_event(integration, 0);
+        if(!event)
+            abort();
+
+        if(event->type == TERMPAINT_EV_CHAR) {
+            if(event->string == "a" && event->modifier & TERMPAINT_MOD_CTRL) {
+                input_pos = 0;
+            } else if (event->string == "e" && event->modifier & TERMPAINT_MOD_CTRL) {
+                input_pos = input.size();
+            } else {
+                if(input_pos + 1 == cols_needed - 1)
+                    continue;
+                input.insert(input_pos, event->string);
+                input_pos++;
+            }
+        } else if (event->type == TERMPAINT_EV_KEY) {
+            if (event->string == "Escape") {
+                input.clear();
+                break;
+            } else if(event->string == "Backspace") {
+                if(!input.empty()) {
+                    input.erase(input_pos - 1, 1);
+                    input_pos--;
+                }
+            } else if(event->string == "Delete") {
+                if(input_pos < input.size()) {
+                    input.erase(input_pos, 1);
+                }
+            } else if(event->string == "ArrowLeft") {
+                if(input_pos > 0)
+                    input_pos--;
+            } else if(event->string == "ArrowRight") {
+                if(input_pos < input.size())
+                    input_pos++;
+            } else if(event->string == "Enter" || event->string == "NumpadEnter") {
+                break;
+            }
+        }
+    }
+
+    termpaint_terminal_set_cursor_visible(terminal, false);
+    termpaint_terminal_set_cursor_style(terminal, TERMPAINT_CURSOR_STYLE_TERM_DEFAULT, false);
+    return input;
+}
+
+std::vector<std::string> split(const std::string &str, const char delim, const unsigned int max_splits=0)
+{
+    std::vector<std::string> parts;
+
+    std::string::const_iterator prev = str.cbegin();
+    std::string::const_iterator cur = str.cbegin();
+    unsigned int splits_done = 0;
+
+    do {
+        cur = std::find(prev, str.cend(), delim);
+        if(max_splits!=0 && splits_done>=max_splits) {
+            parts.emplace_back(prev, str.cend());
+            break;
+        }
+        parts.emplace_back(prev, cur);
+        splits_done++;
+        if(cur!=str.cend())
+            cur++;
+        prev = cur;
+    } while(cur!=str.cend());
+
+    return parts;
+}
+
+struct button_info {
+    Button button;
+    std::string string;
+    size_t width;
+};
+
+static std::vector<button_info> all_buttons = {
+    {Button::Ok, "Ok", 2},
+    {Button::Cancel, "Cancel", 6},
+    {Button::Yes, "Yes", 3},
+    {Button::No, "No", 2},
+};
+static const char *button_gfx_left[]={"[", " "};
+const char *button_gfx_right[]={"]", " "};
+
+Button message_box(const std::string &caption, const std::string &text, const Button buttons, const Button default_button, const Align align)
+{
+    std::vector<button_info> active_buttons;
+
+    size_t buttons_width = 0;
+    for(const button_info &info: all_buttons) {
+        if((buttons & info.button) == info.button) {
+            active_buttons.push_back(info);
+            buttons_width += info.width + 2 + 1;
+        }
+    }
+    if(buttons_width)
+        buttons_width -= 1;
+    size_t selected_button = std::distance(active_buttons.begin(),
+                                           std::find_if(active_buttons.begin(), active_buttons.end(),
+                                                        [default_button](const button_info &info){ return info.button == default_button; }));
+
+    size_t width = std::max(string_width(caption), buttons_width);
+
+    const std::vector<std::string> lines = split(text, '\n');
+    for(const std::string &line: lines) {
+        width = std::max(width, string_width(line));
+    }
+
+    const size_t cols = termpaint_surface_width(surface);
+    const size_t rows = termpaint_surface_height(surface);
+
+    const size_t rows_needed = 4 + lines.size();
+    const size_t cols_needed = width + 4;
+
+    int x, y;
+    resolve_align(align, cols_needed, rows_needed, 0, cols, 0, rows, x, y);
+
+    while(true) {
+        draw_box_with_caption(x, y, cols_needed, rows_needed, caption);
+
+        for(size_t i=0; i<lines.size(); i++) {
+            termpaint_surface_write_with_attr(surface, x + 2, y + 1 + i, lines[i].c_str(), attributes[ASNormal].normal);
+        }
+
+
+        int button_x = x + 2;
+        for(size_t btn=0; btn<active_buttons.size(); btn++) {
+            const bool button_selected = selected_button == btn;
+            termpaint_attr *attr = button_selected ? attributes[ASNormal].highlight : attributes[ASNormal].normal;
+
+            termpaint_surface_write_with_attr(surface, button_x, y + rows_needed - 2, button_gfx_left[button_selected], attr);
+            termpaint_surface_write_with_attr(surface, button_x + 1, y + rows_needed - 2, active_buttons[btn].string.c_str(), attr);
+            termpaint_surface_write_with_attr(surface, button_x + active_buttons[btn].width + 1, y + rows_needed - 2, button_gfx_right[button_selected], attr);
+
+            button_x += active_buttons[btn].width + 2 + 1;
+        }
+
+        termpaint_terminal_flush(terminal, false);
+
+        auto event = wait_for_event(integration, 0);
+        if(!event)
+            abort();
+
+        if (event->type == TERMPAINT_EV_KEY) {
+            if (event->string == "Escape" || event->string == "Enter" || event->string == "NumpadEnter") {
+                break;
+            } else if(event->string == "ArrowLeft" && selected_button > 0) {
+                selected_button--;
+            } else if(event->string == "ArrowRight" && selected_button < active_buttons.size() - 1) {
+                selected_button++;
+            }
+        }
+    }
+
+    return active_buttons[selected_button].button;
+}
+
+void tp_pause()
+{
+    termpaint_terminal_pause(terminal);
+}
+
+void tp_unpause()
+{
+    termpaint_terminal_unpause(terminal);
+}
+
+struct progress_info
+{
+    Align align;
+    size_t width, height;
+    std::string caption;
+    int value, maxvalue;
+};
+
+static void draw_progress(progress_info *info)
+{
+    const size_t cols = termpaint_surface_width(surface);
+    const size_t rows = termpaint_surface_height(surface);
+
+    int x, y;
+    resolve_align(info->align, info->width, info->height, 0, cols, 0, rows, x, y);
+
+    draw_box_with_caption(x, y, info->width, info->height, info->caption);
+
+    size_t progress_w = info->width - 4;
+    float progress = info->value / (float)info->maxvalue;
+    int full_blocks = progress_w * progress;
+    int partial_block = ((progress_w * progress) - full_blocks) * 8;
+
+    std::string draw = repeated(full_blocks, "█");
+
+    switch(partial_block) {
+    case 1:
+        draw.append("▏"); break;
+    case 2:
+        draw.append("▎"); break;
+    case 3:
+        draw.append("▍"); break;
+    case 4:
+        draw.append("▌"); break;
+    case 5:
+        draw.append("▋"); break;
+    case 6:
+        draw.append("▊"); break;
+    case 7:
+        draw.append("▉"); break;
+    default:
+        break;
+    }
+
+    termpaint_surface_write_with_attr(surface, x + 2, y + 1, draw.c_str(), attributes[ASNormal].normal);
+    termpaint_terminal_flush(terminal, false);
+}
+
+progress_info* begin_progress(const std::string &caption, const int width, const Align align)
+{
+    progress_info *info = new progress_info;
+
+    info->align = align;
+    info->width = width + 4;
+    info->height = 3;
+    info->caption = caption;
+    info->value = 0;
+    info->maxvalue = 100;
+
+    draw_progress(info);
+
+    return info;
+}
+
+void update_progress(progress_info *info, int value, int maxvalue)
+{
+    info->value = value;
+    info->maxvalue = maxvalue;
+    draw_progress(info);
+}
+
+void end_progress(progress_info *info)
+{
+    delete info;
+}
+
+std::pair<size_t, size_t> string_size(const std::string &str)
+{
+    size_t width = 0;
+    const std::vector<std::string> lines = split(str, '\n');
+    for(const std::string &line: lines) {
+        width = std::max(width, string_width(line));
+    }
+    return {width, lines.size()};
+}
+
+void write_multiline_string(const int x, const int y, const std::string &str, termpaint_attr *attr)
+{
+    const std::vector<std::string> lines = split(str, '\n');
+    for(size_t i=0; i<lines.size(); i++) {
+        termpaint_surface_write_with_attr(surface, x, y + i, lines[i].c_str(), attr);
+    }
+}
+
+static std::string simple_wrap(const std::string &text, const size_t desired_width)
+{
+    std::string out;
+    size_t current_line_width = 0;
+    for(const std::string &word: split(text, ' ')) {
+        size_t w = string_width(word);
+        if(current_line_width + w < desired_width) {
+            out.append(word).append(" ");
+        } else {
+            current_line_width = 0;
+            out.append("\n").append(word).append(" ");
+        }
+        current_line_width += w + 1;
+    }
+    return out;
+}
+
+void tui_abort(std::string message)
+{
+    const size_t cols = termpaint_surface_width(surface);
+
+    message_box("Error", simple_wrap(message, cols/2));
+    exit(1);
+}
diff --git a/tui.h b/tui.h
new file mode 100644
index 0000000..39c530a
--- /dev/null
+++ b/tui.h
@@ -0,0 +1,74 @@
+#pragma once
+
+#include <termpaintx.h>
+#define EV_TIMEOUT 0xffff
+
+#include <functional>
+#include <optional>
+#include <string>
+#include <vector>
+
+struct Event {
+    int type;
+    int modifier;
+    std::string string;
+};
+
+enum class Align {
+    HCenter = 0x01,
+    Left    = 0x02,
+    Right   = 0x04,
+
+    VCenter = 0x10,
+    Top     = 0x20,
+    Bottom  = 0x40,
+
+    Center = HCenter | VCenter,
+};
+extern Align operator|(const Align &a, const Align &b);
+
+extern termpaint_surface *surface;
+
+enum AttributeSetType {
+    ASNormal,
+    ASWatched,
+    ASUnwatched,
+    ASetTypeCount,
+};
+
+struct AttributeSet {
+    termpaint_attr *normal;
+    termpaint_attr *highlight;
+};
+extern AttributeSet attributes[ASetTypeCount];
+
+enum class Button {
+    Ok = (1<<0),
+    Cancel = (1<<1),
+    Yes = (1<<2),
+    No = (1<<3),
+};
+extern Button operator|(const Button &a, const Button &b);
+extern Button operator&(const Button &a, const Button &b);
+
+extern void tp_init();
+extern void tp_shutdown();
+extern void tp_flush();
+extern void tp_pause();
+extern void tp_unpause();
+extern std::optional<Event> tp_wait_for_event();
+
+extern size_t string_width(const std::string &str);
+extern std::pair<size_t, size_t> string_size(const std::string &str);
+extern void write_multiline_string(const int x, const int y, const std::string &str, termpaint_attr *attr);
+
+extern Button message_box(const std::string &caption, const std::string &text, const Button buttons=Button::Ok, const Button default_button=Button::Ok, const Align align=Align::Center);
+extern int get_selection(const std::string &caption, const std::vector<std::string> &choices, size_t selected=0, const Align align=Align::Center);
+extern std::string get_string(const std::string &caption, const std::string &text=std::string(), const Align align=Align::Center);
+
+struct progress_info;
+extern progress_info* begin_progress(const std::string &caption, const int width, const Align align=Align::Center);
+extern void update_progress(progress_info *info, const int val, const int maxval);
+extern void end_progress(progress_info *info);
+
+extern void tui_abort(std::string message);
diff --git a/yt-tool-tui.pro b/yt-tool-tui.pro
new file mode 100644
index 0000000..804cc14
--- /dev/null
+++ b/yt-tool-tui.pro
@@ -0,0 +1,23 @@
+TEMPLATE = app
+CONFIG += console c++17 sanitizer sanitize_address
+CONFIG -= app_bundle
+CONFIG -= qt
+
+unix:!macx: LIBS += -L$$PWD/termpaint/ -ltermpaint
+
+INCLUDEPATH += $$PWD/termpaint
+DEPENDPATH += $$PWD/termpaint
+
+unix:!macx: PRE_TARGETDEPS += $$PWD/termpaint/libtermpaint.a
+
+SOURCES += \
+        main.cpp \
+        tui.cpp \
+        yt.cpp
+
+HEADERS += \
+    tui.h \
+    yt.h
+
+unix: CONFIG += link_pkgconfig
+unix: PKGCONFIG += libcurl sqlite3 nlohmann_json
diff --git a/yt.cpp b/yt.cpp
new file mode 100644
index 0000000..b23a406
--- /dev/null
+++ b/yt.cpp
@@ -0,0 +1,266 @@
+#include "yt.h"
+
+#include <sqlite3.h>
+#include <nlohmann/json.hpp>
+#include <curl/curl.h>
+
+#include "tui.h"
+
+#define SC(x) { const int res = (x); if(res != SQLITE_OK && res != SQLITE_ROW && res != SQLITE_DONE) { fprintf(stderr, "%s failed: (%d) %s\n", #x, res, sqlite3_errstr(res)); std::abort(); }}
+
+using json = nlohmann::json;
+struct yt_config yt_config;
+
+static std::string get_string(sqlite3_stmt *row, int col)
+{
+    return std::string((char*)sqlite3_column_text(row, col));
+}
+
+static size_t curl_writecallback(void *data, size_t size, size_t nmemb, void *userp)
+{
+    size_t to_add = size * nmemb;
+    std::vector<unsigned char> *buffer = reinterpret_cast<std::vector<unsigned char>*>(userp);
+    const size_t cur_size = buffer->size();
+    buffer->resize(cur_size + to_add);
+    memcpy(buffer->data() + cur_size, data, to_add);
+
+    return to_add;
+}
+
+static json api_request(const std::string &url, std::map<std::string, std::string> params)
+{
+    CURL *curl = curl_easy_init();
+    curl_slist *headers = nullptr;
+    for(const auto &[header, value]: yt_config.extra_headers) {
+        headers = curl_slist_append(headers, (header + ": " + value).c_str());
+    }
+
+    CURLU *u = curl_url();
+    curl_url_set(u, CURLUPART_URL, url.c_str(), 0);
+    for(const auto &[k, v]: params) {
+        std::string p = k + "=" + v;
+        curl_url_set(u, CURLUPART_QUERY, p.c_str(), CURLU_APPENDQUERY|CURLU_URLENCODE);
+    }
+    char *real_url;
+    curl_url_get(u, CURLUPART_URL, &real_url, 0);
+
+    std::vector<unsigned char> data;
+
+    curl_easy_setopt(curl, CURLOPT_URL, real_url);
+    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_writecallback);
+    curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&data);
+
+    //curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
+    curl_easy_perform(curl);
+
+    data.push_back(0);
+
+    int http_response = 0;
+    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_response);
+
+    curl_free(real_url);
+    curl_url_cleanup(u);
+    curl_easy_cleanup(curl);
+    if(headers)
+        curl_slist_free_all(headers);
+
+    try {
+        return json::parse(data);
+    } catch (json::exception &err) {
+    }
+    return {};
+}
+
+Channel::Channel(sqlite3_stmt *row): id(get_string(row, 0)), name(get_string(row, 1))
+{
+}
+
+Channel::Channel(const std::string &id, const std::string &name): id(id), name(name)
+{
+}
+
+Channel Channel::add(sqlite3 *db, const std::string &selector, const std::string &value)
+{
+    std::map<std::string, std::string> params = {
+        {"part", "snippet"},
+        {selector, value},
+        {"key", yt_config.api_key},
+    };
+
+    const json response = api_request("https://content.googleapis.com/youtube/v3/channels", params);
+
+    const json page_info = response["pageInfo"];
+    const bool any_results = page_info["totalResults"] > 0;
+
+    if(!any_results) {
+        return Channel("", "");
+    }
+
+    const std::string channel_id = response["items"][0]["id"];
+    const std::string channel_name = response["items"][0]["snippet"]["title"];
+
+    sqlite3_stmt *query;
+    SC(sqlite3_prepare_v2(db, "INSERT INTO channels(channelId, name) VALUES(?1, ?2);", -1, &query, nullptr));
+    SC(sqlite3_bind_text(query, 1, channel_id.c_str(), -1, SQLITE_TRANSIENT));
+    SC(sqlite3_bind_text(query, 2, channel_name.c_str(), -1, SQLITE_TRANSIENT));
+    sqlite3_step(query);
+    SC(sqlite3_finalize(query));
+
+    return Channel(channel_id, channel_name);
+}
+
+std::string Channel::upload_playlist() const
+{
+    return "UU" + id.substr(2);
+}
+
+bool video_is_known(sqlite3 *db, const std::string &channel_id, const std::string &video_id)
+{
+    sqlite3_stmt *query;
+    SC(sqlite3_prepare_v2(db, "SELECT 1 FROM videos WHERE channelId=?1 AND videoId=?2 LIMIT 1;", -1, &query, nullptr));
+    SC(sqlite3_bind_text(query, 1, channel_id.c_str(), -1, SQLITE_TRANSIENT));
+    SC(sqlite3_bind_text(query, 2, video_id.c_str(), -1, SQLITE_TRANSIENT));
+
+    bool known = false;
+    const int res = sqlite3_step(query);
+    if(res == SQLITE_ROW) {
+        known =  sqlite3_column_int(query, 0) > 0;
+    } else if(res == SQLITE_DONE) {
+        known = false;
+    }
+    SC(sqlite3_finalize(query));
+
+    return known;
+}
+
+void add_video(sqlite3 *db, const json &snippet, const std::string &channel_id) {
+    const std::string video_id = snippet["resourceId"]["videoId"];
+    const std::string title = snippet["title"];
+    const std::string description = snippet["description"];
+    const int flags = 0;
+    const std::string published = snippet["publishedAt"];
+
+    sqlite3_stmt *query;
+    SC(sqlite3_prepare_v2(db, "INSERT INTO videos (videoId, channelId, title, description, flags, published) values(?1,?2,?3,?4,?5,?6);", -1, &query, nullptr));
+    SC(sqlite3_bind_text(query, 1, video_id.c_str(), -1, SQLITE_TRANSIENT));
+    SC(sqlite3_bind_text(query, 2, channel_id.c_str(), -1, SQLITE_TRANSIENT));
+    SC(sqlite3_bind_text(query, 3, title.c_str(), -1, SQLITE_TRANSIENT));
+    SC(sqlite3_bind_text(query, 4, description.c_str(), -1, SQLITE_TRANSIENT));
+    SC(sqlite3_bind_int(query, 5, flags));
+    SC(sqlite3_bind_text(query, 6, published.c_str(), -1, SQLITE_TRANSIENT));
+    sqlite3_step(query);
+    SC(sqlite3_finalize(query));
+}
+
+
+void Channel::fetch_new_videos(sqlite3 *db, progress_info *info, std::optional<std::string> after, std::optional<int> max_count)
+{
+    const std::string playlist_id = upload_playlist();
+    std::map<std::string, std::string> params = {
+        {"part", "snippet"},
+        {"playlistId", playlist_id},
+        {"maxResults", "50"},
+        {"key", yt_config.api_key},
+    };
+
+    sqlite3_exec(db, "BEGIN TRANSACTION;", nullptr, nullptr, nullptr);
+
+    int processed = 0;
+    bool abort = false;
+    while(true) {
+        const json response = api_request("https://content.googleapis.com/youtube/v3/playlistItems", params);
+
+        if(response.empty())
+            break;
+
+        for(auto &item: response["items"]) {
+            auto snippet = item["snippet"];
+            std::string channel_id = snippet["channelId"];
+            std::string video_id = snippet["resourceId"]["videoId"];
+            std::string title = snippet["title"];
+
+            if(after) {
+                auto publishedAt = snippet["publishedAt"];
+                if(publishedAt < *after) {
+                    //fprintf(stderr, "Stopping at video '%s': Too old.\r\n", title.c_str());
+                    abort = true;
+                    break;
+                }
+            }
+
+            if(video_is_known(db, channel_id, video_id)) {
+                //fprintf(stderr, "Stopping at video '%s': Already known.\r\n", title.c_str());
+                abort = true;
+                break;
+            }
+
+            add_video(db, snippet, channel_id);
+            //fprintf(stderr, "New video: '%s': %s.\r\n", title.c_str(), video_id.c_str());
+            processed += 1;
+            if(max_count && processed >= *max_count) {
+                abort = true;
+                break;
+            }
+        }
+
+        const json page_info = response["pageInfo"];
+        const int results = page_info["totalResults"];
+        if(info)
+            update_progress(info, processed, results);
+
+        if(!abort && response.contains("nextPageToken")) {
+            params["pageToken"] = response["nextPageToken"];
+            //fprintf(stderr, "Processed %d. Next page...\r\n", processed);
+        } else {
+            break;
+        }
+    }
+
+    sqlite3_exec(db, "COMMIT TRANSACTION;", nullptr, nullptr, nullptr);
+}
+
+void Channel::load_info(sqlite3 *db)
+{
+    sqlite3_stmt *query;
+    SC(sqlite3_prepare_v2(db, "SELECT "
+                              "(SELECT count(*) FROM videos WHERE channelId = ?1), "
+                              "(SELECT count(*) FROM videos WHERE channelId = ?1 AND flags & ?2 = 0)"
+                              ";", -1, &query, nullptr));
+    SC(sqlite3_bind_text(query, 1, id.c_str(), -1, SQLITE_TRANSIENT));
+    SC(sqlite3_bind_int(query, 2, kWatched));
+    sqlite3_step(query);
+    video_count = sqlite3_column_int(query, 0);
+    unwatched = sqlite3_column_int(query, 1);
+    SC(sqlite3_finalize(query));
+}
+
+void Channel::videos_watched(int count)
+{
+    unwatched -= count;
+}
+
+bool Channel::is_valid() const
+{
+    return !id.empty() && !name.empty();
+}
+
+Video::Video(sqlite3_stmt *row): id(get_string(row, 0)), title(get_string(row, 2)), description(get_string(row, 3)), flags(sqlite3_column_int(row, 4)), published(get_string(row, 5))
+{
+}
+
+void Video::set_flag(sqlite3 *db, VideoFlag flag, bool value)
+{
+    sqlite3_stmt *query;
+    if(value){
+        SC(sqlite3_prepare_v2(db, "UPDATE videos SET flags = flags | ?1 WHERE videoID = ?2;", -1, &query, nullptr));
+        flags |= flag;
+    } else {
+        SC(sqlite3_prepare_v2(db, "UPDATE videos SET flags = flags & ~?1 WHERE videoID = ?2;", -1, &query, nullptr));
+        flags &= ~flag;
+    }
+    SC(sqlite3_bind_int(query, 1, flag));
+    SC(sqlite3_bind_text(query, 2, id.c_str(), -1, SQLITE_TRANSIENT));
+    SC(sqlite3_step(query));
+    SC(sqlite3_finalize(query));
+}
diff --git a/yt.h b/yt.h
new file mode 100644
index 0000000..2e5b1c1
--- /dev/null
+++ b/yt.h
@@ -0,0 +1,55 @@
+#pragma once
+
+#include <map>
+#include <optional>
+#include <string>
+
+class sqlite3;
+class sqlite3_stmt;
+class progress_info;
+
+extern struct yt_config {
+    std::string api_key;
+    std::map<std::string, std::string> extra_headers;
+} yt_config;
+
+class Channel
+{
+public:
+    std::string id;
+    std::string name;
+
+    Channel(sqlite3_stmt *row);
+    static Channel add(sqlite3 *db, const std::string &selector, const std::string &value);
+
+    std::string upload_playlist() const;
+    void fetch_new_videos(sqlite3 *db, progress_info *info=nullptr, std::optional<std::string> after={}, std::optional<int> max_count={});
+    void load_info(sqlite3 *db);
+    void videos_watched(int count);
+    bool is_valid() const;
+
+    unsigned int video_count;
+    unsigned int unwatched;
+private:
+    Channel(const std::string &id, const std::string &name);
+};
+
+enum VideoFlag {
+    kNone = 0,
+    kWatched = (1<<0),
+    kDownloaded = (1<<1),
+};
+
+struct Video
+{
+    std::string id;
+    std::string title;
+    std::string description;
+    int flags;
+    std::string published;
+
+    Video(sqlite3_stmt *row);
+    void set_flag(sqlite3 *db, VideoFlag flag, bool value=true);
+
+    size_t tui_title_width;
+};
diff --git a/yttui.conf.example b/yttui.conf.example
new file mode 100644
index 0000000..ffa9e28
--- /dev/null
+++ b/yttui.conf.example
@@ -0,0 +1,6 @@
+{
+    "apiKey": "YOUR_API_KEY",
+    "extraHeaders": [
+        {"key": "x-extra", "value": "heder"}
+    ]
+}