#pragma once

#include "Page.hpp"
#include "../include/AsyncTask.hpp"
#include <unordered_set>

namespace QuickMedia {
    struct YoutubeFormat {
        std::string url;
        int bitrate = 0;
        std::string mime_type;
    };

    struct YoutubeVideoFormat {
        YoutubeFormat base;
        int width = 0;
        int height = 0;
        int fps = 0;
        bool has_embedded_audio = false;
    };

    struct YoutubeAudioFormat {
        YoutubeFormat base;
    };

    bool youtube_url_extract_id(const std::string &youtube_url, std::string &youtube_video_id);
    // |video_url| or |audio_url| will be empty if there is an error and false will be returned.
    // If false is returned from |active_handler|, then this function is cancelled.
    bool youtube_custom_redirect(std::string &video_url, std::string &audio_url, int &video_content_length, int &audio_content_length, std::function<bool()> active_handler);

    class YoutubeSearchPage : public LazyFetchPage {
    public:
        YoutubeSearchPage(Program *program) : LazyFetchPage(program) {}
        const char* get_title() const override { return "Search"; }
        bool search_is_filter() override { return false; }
        SearchResult search(const std::string &str, BodyItems &result_items) override;
        PluginResult get_page(const std::string &str, int page, BodyItems &result_items) override;
        PluginResult submit(const std::string &title, const std::string &url, std::vector<Tab> &result_tabs) override;
        PluginResult lazy_fetch(BodyItems &result_items) override;
        bool lazy_fetch_is_loader() override { return true; }
    private:
        PluginResult search_get_continuation(const std::string &url, const std::string &continuation_token, BodyItems &result_items);
    private:
        std::string search_url;
        std::string continuation_token;
        int current_page = 0;
        std::unordered_set<std::string> added_videos;
    };

    class YoutubeCommentsPage : public LazyFetchPage {
    public:
        YoutubeCommentsPage(Program *program, const std::string &xsrf_token, const std::string &continuation_token) : LazyFetchPage(program), xsrf_token(xsrf_token), continuation_token(continuation_token) {}
        const char* get_title() const override { return "Comments"; }
        PluginResult get_page(const std::string &str, int page, BodyItems &result_items) override;
        PluginResult submit(const std::string &title, const std::string &url, std::vector<Tab> &result_tabs) override;
        PluginResult lazy_fetch(BodyItems &result_items) override;
    private:
        int current_page = 0;
        std::string xsrf_token;
        std::string continuation_token;
    };

    class YoutubeCommentRepliesPage : public LazyFetchPage {
    public:
        YoutubeCommentRepliesPage(Program *program, const std::string &xsrf_token, const std::string &continuation_token) : LazyFetchPage(program), xsrf_token(xsrf_token), continuation_token(continuation_token) {}
        const char* get_title() const override { return "Comment replies"; }
        PluginResult get_page(const std::string &str, int page, BodyItems &result_items) override;
        PluginResult submit(const std::string &title, const std::string &url, std::vector<Tab> &result_tabs) override;
        PluginResult lazy_fetch(BodyItems &result_items) override;
    private:
        int current_page = 0;
        std::string xsrf_token;
        std::string continuation_token;
    };

    class YoutubeChannelPage : public LazyFetchPage, public TrackablePage {
    public:
        YoutubeChannelPage(Program *program, std::string url, std::string continuation_token, std::string title) : LazyFetchPage(program), TrackablePage(title, url), url(url), continuation_token(std::move(continuation_token)), title(title) {}
        const char* get_title() const override { return title.c_str(); }
        bool search_is_filter() override { return false; }
        SearchResult search(const std::string &str, BodyItems &result_items) override;
        PluginResult get_page(const std::string &str, int page, BodyItems &result_items) override;
        PluginResult submit(const std::string &title, const std::string &url, std::vector<Tab> &result_tabs) override;
        PluginResult lazy_fetch(BodyItems &result_items) override;

        TrackResult track(const std::string &str) override;
        bool is_trackable() const override { return true; }

        std::unordered_set<std::string> added_videos;
    private:
        PluginResult search_get_continuation(const std::string &url, const std::string &continuation_token, BodyItems &result_items);
    private:
        const std::string url;
        std::string continuation_token;
        const std::string title;
        int current_page = 0;
    };

    struct YoutubeSubscriptionTaskResult {
        std::shared_ptr<BodyItem> body_item;
        time_t timestamp = 0;
    };

    class YoutubeSubscriptionsPage : public LazyFetchPage {
    public:
        YoutubeSubscriptionsPage(Program *program) : LazyFetchPage(program) {}
        const char* get_title() const override { return "Subscriptions"; }
        PluginResult submit(const std::string &title, const std::string &url, std::vector<Tab> &result_tabs) override;
        PluginResult lazy_fetch(BodyItems &result_items) override;
    private:
        std::array<AsyncTask<std::vector<YoutubeSubscriptionTaskResult>>, 4> subscription_load_tasks; // TODO: Use multiple curl outputs instead?
    };

    class YoutubeRecommendedPage : public LazyFetchPage {
    public:
        YoutubeRecommendedPage(Program *program) : LazyFetchPage(program) {}
        const char* get_title() const override { return "Recommended"; }
        PluginResult get_page(const std::string &str, int page, BodyItems &result_items) override;
        PluginResult submit(const std::string &title, const std::string &url, std::vector<Tab> &result_tabs) override;
        PluginResult lazy_fetch(BodyItems &result_items) override;
        bool reload_on_page_change() override { return true; }
    private:
        PluginResult search_get_continuation(const std::string &continuation_token, BodyItems &result_items);
    private:
        int current_page = 0;
        std::string continuation_token;
        std::unordered_set<std::string> added_videos;
    };

    class YoutubeRelatedVideosPage : public RelatedVideosPage {
    public:
        YoutubeRelatedVideosPage(Program *program) : RelatedVideosPage(program) {}
        PluginResult submit(const std::string&, const std::string&, std::vector<Tab> &result_tabs) override;
    };

    class YoutubeVideoPage : public VideoPage {
    public:
        YoutubeVideoPage(Program *program, std::string url);
        const char* get_title() const override { return ""; }
        BodyItems get_related_media(const std::string &url) override;
        std::unique_ptr<Page> create_search_page(Program *program, int &search_delay) override;
        std::unique_ptr<Page> create_comments_page(Program *program) override;
        std::unique_ptr<RelatedVideosPage> create_related_videos_page(Program *program) override;
        std::unique_ptr<Page> create_channels_page(Program *program, const std::string &channel_url) override;
        void set_url(std::string new_url) override;
        std::string get_url_timestamp() override { return timestamp; }
        std::string get_video_url(int max_height, bool &has_embedded_audio) override;
        std::string get_audio_url() override;
        PluginResult load(std::string &title, std::string &channel_url, std::vector<MediaChapter> &chapters) override;
        void mark_watched() override;
    private:
        PluginResult get_video_info(const std::string &video_id, Json::Value &json_root);
        PluginResult parse_video_response(Json::Value &json_root, std::string &title, std::string &channel_url, std::vector<MediaChapter> &chapters);
        void parse_format(const Json::Value &format_json, bool is_adaptive);
        void parse_formats(const Json::Value &streaming_data_json);
    private:
        std::string timestamp;
        std::string xsrf_token;
        std::string comments_continuation_token;
        std::string livestream_url;
        std::vector<YoutubeVideoFormat> video_formats;
        std::vector<YoutubeAudioFormat> audio_formats;

        std::string playback_url;
        std::string watchtime_url;
        std::string tracking_url;
    };
}