#pragma once

#include "Text.hpp"
#include <SFML/Graphics/Text.hpp>
#include <SFML/Graphics/Texture.hpp>
#include <SFML/Graphics/RectangleShape.hpp>
#include <SFML/Graphics/Sprite.hpp>
#include "../external/RoundedRectangleShape.hpp"
#include <json/value.h>
#include <thread>
#include <future>

namespace sf {
    class RenderWindow;
}

namespace QuickMedia {
    class Program;

    class BodyItem {
    public:
        BodyItem(std::string _title);
        BodyItem(const BodyItem &other);

        void set_title(std::string new_title) {
            if(title.empty() && new_title.empty())
                return;
            title = std::move(new_title);
            dirty = true;
        }

        void append_title(std::string str) {
            title += str;
            dirty = true;
        }

        void set_description(std::string new_description) {
            if(description.empty() && new_description.empty())
                return;
            description = std::move(new_description);
            dirty_description = true;
        }

        void append_description(std::string str) {
            description += str;
            dirty_description = true;
        }

        void set_author(std::string new_author) {
            if(author.empty() && new_author.empty())
                return;
            author = std::move(new_author);
            dirty_author = true;
        }

        const std::string& get_title() const { return title; }
        const std::string& get_description() const { return description; }
        const std::string& get_author() const { return author; }

        // TODO: Use a list of strings instead, not all plugins need all of these fields
        std::string url;
        std::string thumbnail_url;
        std::string attached_content_url; // TODO: Remove and use |url| instead
        bool visible;
        bool dirty;
        bool dirty_description;
        bool dirty_author;
        bool thumbnail_is_local;
        std::unique_ptr<Text> title_text;
        std::unique_ptr<Text> description_text;
        std::unique_ptr<Text> author_text;
        // Used by image boards for example. The elements are indices to other body items
        std::vector<size_t> replies;
        std::string post_number;
        sf::Color title_color;
        sf::Color author_color;
    private:
        std::string title;
        std::string description;
        std::string author;
    };

    using BodyItems = std::vector<std::unique_ptr<BodyItem>>;

    class Body {
    public:
        Body(Program *program, sf::Font *font, sf::Font *bold_font, sf::Font *cjk_font);
        ~Body();

        // Select previous page, ignoring invisible items. Returns true if the item was changed. This can be used to check if the top was hit when wrap_around is set to false
        bool select_previous_page();
        // Select next page, ignoring invisible items. Returns true if the item was changed. This can be used to check if the bottom was hit when wrap_around is set to false
        bool select_next_page();

        // Select previous item, ignoring invisible items. Returns true if the item was changed. This can be used to check if the top was hit when wrap_around is set to false
        bool select_previous_item();

        // Select next item, ignoring invisible items. Returns true if the item was changed. This can be used to check if the bottom was hit when wrap_around is set to false
        bool select_next_item();
        void set_selected_item(int item);
        
        void select_first_item();
        void select_last_item();
        void reset_selected();
        void clear_items();
        void prepend_items(BodyItems new_items);
        void append_items(BodyItems new_items);
        void clear_thumbnails();

        BodyItem* get_selected() const;

        void clamp_selection();
        void draw(sf::RenderWindow &window, sf::Vector2f pos, sf::Vector2f size);
        void draw(sf::RenderWindow &window, sf::Vector2f pos, sf::Vector2f size, const Json::Value &content_progress);
        static bool string_find_case_insensitive(const std::string &str, const std::string &substr);

        // TODO: Make this actually fuzzy... Right now it's just a case insensitive string find.
        // This would require reordering the body.
        // TODO: Highlight the part of the text that matches the search.
        // TODO: Ignore dot, whitespace and special characters
        void filter_search_fuzzy(const std::string &text);

        bool no_items_visible() const;

        int get_selected_item() const { return selected_item; }

        void set_page_scroll(float scroll) { page_scroll = scroll; }
        float get_page_scroll() const { return page_scroll; }
        bool is_last_item_fully_visible() const { return last_item_fully_visible; }

        sf::Font *font;
        sf::Font *bold_font;
        sf::Font *cjk_font;
        sf::Text progress_text;
        sf::Text replies_text;
        BodyItems items;
        bool draw_thumbnails;
        bool wrap_around;
        // Set to {0, 0} to disable resizing
        sf::Vector2i thumbnail_resize_target_size;
        sf::Vector2f thumbnail_fallback_size;
        sf::Color line_seperator_color;
    private:
        void draw_item(sf::RenderWindow &window, BodyItem *item, const sf::Vector2f &pos, const sf::Vector2f &size, const float item_height, const int item_index, const Json::Value &content_progress);
        float get_item_height(BodyItem *item);
    private:
        enum class LoadingState {
            NOT_LOADED,
            LOADING,
            FINISHED_LOADING,
            APPLIED_TO_TEXTURE
        };

        struct ThumbnailData {
            bool referenced = false;
            LoadingState loading_state = LoadingState::NOT_LOADED;
            sf::Texture texture;
            std::unique_ptr<sf::Image> image; // Set in another thread, and then reset after loading it into |texture|
        };
        Program *program;
        void load_thumbnail_from_url(const std::string &url, bool local, sf::Vector2i thumbnail_resize_target_size, std::shared_ptr<ThumbnailData> thumbnail_data);
        std::unordered_map<std::string, std::shared_ptr<ThumbnailData>> item_thumbnail_textures;
        bool loading_thumbnail;
        int selected_item;
        int prev_selected_item;
        float page_scroll;
        // TODO: Use a loading gif or something similar instead, to properly indicate the image is loading. Which could also have text that says "failed to load image" when image loading failed.
        sf::RectangleShape image_fallback;
        sf::RectangleShape item_background_shadow;
        sf::RoundedRectangleShape item_background;
        sf::Sprite image;
        std::future<void> load_thumbnail_future;
        int num_visible_items;
        bool last_item_fully_visible;
    };
}