#pragma once

#include "../include/FileAnalyzer.hpp"
#include "Plugin.hpp"
#include "Page.hpp"
#include <SFML/Graphics/Color.hpp>
#include <unordered_map>
#include <mutex>
#include <rapidjson/fwd.h>

namespace QuickMedia {
    // Dummy, only play one video. TODO: Play all videos in room, as related videos?
    class MatrixVideoPage : public Page {
    public:
        MatrixVideoPage(Program *program) : Page(program) {}
        const char* get_title() const override { return ""; }
        PluginResult submit(const std::string &title, const std::string &url, std::vector<Tab> &result_tabs) override {
            (void)title;
            (void)url;
            (void)result_tabs;
            return PluginResult::ERR;
        }
        bool is_video_page() const override { return true; }
    };

    struct RoomData;

    struct UserInfo {
        friend struct RoomData;

        std::string user_id;
        std::string display_name;
        std::string avatar_url;
        sf::Color display_name_color;
    private:
        std::string read_marker_event_id;
    };

    enum class MessageType {
        TEXT,
        IMAGE,
        VIDEO,
        AUDIO,
        FILE,
        REDACTION
    };

    enum class RelatedEventType {
        NONE,
        REPLY,
        EDIT,
        REDACTION
    };

    struct Message {
        std::shared_ptr<UserInfo> user;
        std::string event_id;
        std::string body;
        std::string url;
        std::string thumbnail_url;
        std::string related_event_id;
        RelatedEventType related_event_type;
        bool mentions_me = false;
        time_t timestamp = 0;
        MessageType type;
    };

    struct RoomData {
        std::shared_ptr<UserInfo> get_user_by_id(const std::string &user_id);
        void add_user(std::shared_ptr<UserInfo> user);

        void set_user_read_marker(std::shared_ptr<UserInfo> &user, const std::string &event_id);
        std::string get_user_read_marker(std::shared_ptr<UserInfo> &user);

        // Ignores duplicates
        void prepend_messages_reverse(std::vector<std::shared_ptr<Message>> new_messages);
        // Ignores duplicates
        void append_messages(std::vector<std::shared_ptr<Message>> new_messages);

        std::shared_ptr<Message> get_message_by_id(const std::string &id);

        std::vector<std::shared_ptr<UserInfo>> get_users_excluding_me(const std::string &my_user_id);

        void acquire_room_lock();
        void release_room_lock();

        const std::vector<std::shared_ptr<Message>>& get_messages_thread_unsafe() const;

        std::string id;
        std::string name;
        std::string avatar_url;
        std::string prev_batch;
        bool initial_fetch_finished = false;

        // These are messages fetched with |Matrix::get_message_by_id|. Needed to show replies, when replying to old message not part of /sync.
        // The value is nullptr if the message is fetched and cached but the event if referenced an invalid message.
        // TODO: Verify if replied to messages are also part of /sync; then this is not needed.
        std::unordered_map<std::string, std::shared_ptr<Message>> fetched_messages_by_event_id;
    private:
        std::mutex user_mutex;
        std::mutex room_mutex;
        // Each room has its own list of user data, even if multiple rooms has the same user
        // because users can have different display names and avatars in different rooms.
        std::unordered_map<std::string, std::shared_ptr<UserInfo>> user_info_by_user_id;
        std::vector<std::shared_ptr<Message>> messages;
        std::unordered_map<std::string, std::shared_ptr<Message>> message_by_event_id;
    };

    enum class MessageDirection {
        BEFORE,
        AFTER
    };

    struct UploadInfo {
        ContentType content_type;
        size_t file_size;
        std::optional<Dimensions> dimensions;
        std::optional<double> duration_seconds;
        std::string content_uri;
    };

    using Messages = std::vector<std::shared_ptr<Message>>;
    using RoomSyncMessages = std::unordered_map<std::shared_ptr<RoomData>, Messages>;
    using Rooms = std::vector<std::shared_ptr<RoomData>>;

    bool message_contains_user_mention(const std::string &msg, const std::string &username);

    class Matrix {
    public:
        PluginResult sync(RoomSyncMessages &room_messages);
        void get_room_join_updates(Rooms &new_rooms);
        PluginResult get_all_synced_room_messages(std::shared_ptr<RoomData> room, Messages &messages);
        PluginResult get_previous_room_messages(std::shared_ptr<RoomData> room, Messages &messages);

        // |url| should only be set when uploading media.
        // TODO: Make api better.
        PluginResult post_message(std::shared_ptr<RoomData> room, const std::string &body, const std::optional<UploadInfo> &file_info, const std::optional<UploadInfo> &thumbnail_info);
        // |relates_to| is from |BodyItem.userdata| and is of type |Message*|
        PluginResult post_reply(std::shared_ptr<RoomData> room, const std::string &body, void *relates_to);
        // |relates_to| is from |BodyItem.userdata| and is of type |Message*|
        PluginResult post_edit(std::shared_ptr<RoomData> room, const std::string &body, void *relates_to);
        
        PluginResult post_file(std::shared_ptr<RoomData> room, const std::string &filepath, std::string &err_msg);
        PluginResult login(const std::string &username, const std::string &password, const std::string &homeserver, std::string &err_msg);
        PluginResult logout();

        // |message| is from |BodyItem.userdata| and is of type |Message*|
        PluginResult delete_message(std::shared_ptr<RoomData> room, void *message, std::string &err_msg);

        PluginResult load_and_verify_cached_session();

        PluginResult on_start_typing(std::shared_ptr<RoomData> room);
        PluginResult on_stop_typing(std::shared_ptr<RoomData> room);

        PluginResult set_read_marker(std::shared_ptr<RoomData> room, const Message *message);

        // |message| is from |BodyItem.userdata| and is of type |Message*|
        bool was_message_posted_by_me(void *message);

        std::string message_get_author_displayname(Message *message) const;

        // Cached
        PluginResult get_config(int *upload_size);

        std::shared_ptr<UserInfo> get_me(std::shared_ptr<RoomData> room);

        // Returns nullptr if message cant be found. Note: cached
        std::shared_ptr<Message> get_message_by_id(RoomData *room, const std::string &event_id);

        bool use_tor = false;
    private:
        PluginResult sync_response_to_body_items(const rapidjson::Document &root, RoomSyncMessages &room_messages);
        PluginResult get_previous_room_messages(std::shared_ptr<RoomData> &room_data);
        void events_add_user_info(const rapidjson::Value &events_json, RoomData *room_data);
        void events_add_user_read_markers(const rapidjson::Value &events_json, RoomData *room_data);
        void events_add_messages(const rapidjson::Value &events_json, std::shared_ptr<RoomData> &room_data, MessageDirection message_dir, RoomSyncMessages *room_messages, bool has_unread_notifications);
        void events_set_room_name(const rapidjson::Value &events_json, RoomData *room_data);
        std::shared_ptr<Message> parse_message_event(const rapidjson::Value &event_item_json, RoomData *room_data);
        PluginResult upload_file(std::shared_ptr<RoomData> room, const std::string &filepath, UploadInfo &file_info, UploadInfo &thumbnail_info, std::string &err_msg);

        std::shared_ptr<Message> get_edited_message_original_message(RoomData *room_data, std::shared_ptr<Message> message);

        std::shared_ptr<RoomData> get_room_by_id(const std::string &id);
        void add_room(std::shared_ptr<RoomData> room);
        DownloadResult download_json(rapidjson::Document &result, const std::string &url, std::vector<CommandArg> additional_args, bool use_browser_useragent = false, std::string *err_msg = nullptr) const;
    private:
        std::vector<std::shared_ptr<RoomData>> rooms;
        std::unordered_map<std::string, size_t> room_data_by_id; // value is an index into |rooms|
        size_t room_list_read_index = 0;
        std::mutex room_data_mutex;
        std::string user_id;
        std::string username;
        std::string access_token;
        std::string homeserver;
        std::optional<int> upload_limit;
        std::string next_batch;
    };
}