#include "../../plugins/Mangadex.hpp"
#include <json/writer.h>

namespace QuickMedia {
    PluginResult legacy_mangadex_id_to_new_manga_id(Page *page, const std::vector<int> &manga_ids, std::vector<std::pair<int, std::string>> &new_manga_ids) {
        Json::Value request_json(Json::objectValue);
        request_json["type"] = "manga";
        Json::Value manga_ids_json(Json::arrayValue);
        for(int manga_id : manga_ids) {
            manga_ids_json.append(manga_id);
        }
        request_json["ids"] = std::move(manga_ids_json);

        Json::StreamWriterBuilder json_builder;
        json_builder["commentStyle"] = "None";
        json_builder["indentation"] = "";

        std::vector<CommandArg> additional_args = {
            { "-X", "POST" },
            { "-H", "content-type: application/json" },
            { "--data-binary", Json::writeString(json_builder, request_json) }
        };

        Json::Value json_root;
        if(page->download_json(json_root, "https://api.mangadex.org/legacy/mapping", std::move(additional_args), true) != DownloadResult::OK)
            return PluginResult::NET_ERR;

        if(!json_root.isArray())
            return PluginResult::OK;

        for(const Json::Value &result_item_json : json_root) {
            if(!result_item_json.isObject())
                continue;

            const Json::Value &result_json = result_item_json["result"];
            if(!result_json.isString() || strcmp(result_json.asCString(), "ok") != 0)
                continue;

            const Json::Value &data_json = result_item_json["data"];
            if(!data_json.isObject())
                continue;

            const Json::Value &attributes_json = data_json["attributes"];
            if(!attributes_json.isObject())
                continue;

            const Json::Value &legacy_id_json = attributes_json["legacyId"];
            if(!legacy_id_json.isInt())
                continue;

            const Json::Value &new_id_json = attributes_json["newId"];
            if(!new_id_json.isString())
                continue;

            new_manga_ids.push_back(std::make_pair<int, std::string>(legacy_id_json.asInt(), new_id_json.asString()));
        }

        return PluginResult::OK;
    }

    class MangadexChapterImagesList : public BodyItemExtra {
    public:
        std::vector<std::string> image_urls;
    };

    SearchResult MangadexSearchPage::search(const std::string &str, int page, BodyItems &result_items) {
        std::string url = "https://api.mangadex.org/manga?title=" + url_param_encode(str) + "&limit=100&offset=" + std::to_string(page * 100);

        Json::Value json_root;
        if(download_json(json_root, url, {}, true) != DownloadResult::OK)
            return SearchResult::NET_ERR;

        if(!json_root.isObject())
            return SearchResult::OK;

        const Json::Value &results_json = json_root["results"];
        if(!results_json.isArray())
            return SearchResult::OK;

        for(const Json::Value &result_item_json : results_json) {
            if(!result_item_json.isObject())
                continue;

            const Json::Value &result_json = result_item_json["result"];
            if(!result_json.isString() || strcmp(result_json.asCString(), "ok") != 0)
                continue;

            const Json::Value &data_json = result_item_json["data"];
            if(!data_json.isObject())
                continue;
            
            const Json::Value &id_json = data_json["id"];
            if(!id_json.isString())
                continue;

            const Json::Value &attributes_json = data_json["attributes"];
            if(!attributes_json.isObject())
                continue;

            const Json::Value &title_json = attributes_json["title"];
            if(!title_json.isObject())
                continue;

            std::string title;
            const Json::Value &title_en_json = title_json["en"];
            if(title_en_json.isString())
                title = title_en_json.asString();
            else
                title = "No title"; // TODO: Verify if this happens. If it happens, get the title in any available language

            auto body_item = BodyItem::create(std::move(title));
            body_item->url = id_json.asString();
            result_items.push_back(std::move(body_item));
        }

        return SearchResult::OK;
    }

    SearchResult MangadexSearchPage::search(const std::string &str, BodyItems &result_items) {
        return search(str, 0, result_items);
    }

    PluginResult MangadexSearchPage::get_page(const std::string &str, int page, BodyItems &result_items) {
        return search_result_to_plugin_result(search(str, page, result_items));
    }

    static PluginResult get_chapters_for_manga(Page *page, const std::string &manga_id, int page_num, BodyItems &result_items) {
        std::string request_url = "https://api.mangadex.org/manga/" + manga_id + "/feed?order[chapter]=desc&limit=100&locales[]=en&offset=" + std::to_string(page_num * 100);

        Json::Value json_root;
        if(page->download_json(json_root, request_url, {}, true) != DownloadResult::OK)
            return PluginResult::NET_ERR;

        if(!json_root.isObject())
            return PluginResult::OK;

        const Json::Value &results_json = json_root["results"];
        if(!results_json.isArray())
            return PluginResult::OK;

        for(const Json::Value &result_item_json : results_json) {
            if(!result_item_json.isObject())
                continue;

            const Json::Value &result_json = result_item_json["result"];
            if(!result_json.isString() || strcmp(result_json.asCString(), "ok") != 0)
                continue;

            const Json::Value &data_json = result_item_json["data"];
            if(!data_json.isObject())
                continue;

            const Json::Value &id_json = data_json["id"];
            if(!id_json.isString())
                continue;

            const Json::Value &attributes_json = data_json["attributes"];
            if(!attributes_json.isObject())
                continue;

            const Json::Value &translated_language_json = attributes_json["translatedLanguage"];
            if(!translated_language_json.isString() || strcmp(translated_language_json.asCString(), "en") != 0)
                continue;

            const Json::Value &chapter_json = attributes_json["chapter"];
            if(!chapter_json.isString())
                continue;

            std::string title = "Ch. " + chapter_json.asString();
            const Json::Value &title_json = attributes_json["title"];
            if(title_json.isString() && title_json.asCString()[0] != '\0')
                title += " - " + title_json.asString();

            const Json::Value &hash_json = attributes_json["hash"];
            if(!hash_json.isString())
                continue;

            const Json::Value &attributes_data_json = attributes_json["data"];
            if(!attributes_data_json.isArray())
                continue;

            auto body_item = BodyItem::create(std::move(title));
            body_item->url = id_json.asString();
            auto images_list = std::make_shared<MangadexChapterImagesList>();
            for(const Json::Value &data_item_json : attributes_data_json) {
                if(!data_item_json.isString())
                    continue;

                std::string url = hash_json.asString() + "/" + data_item_json.asString();
                images_list->image_urls.push_back(std::move(url));
            }
            body_item->extra = std::move(images_list);
            result_items.push_back(std::move(body_item));
        }

        return PluginResult::OK;
    }

    PluginResult MangadexSearchPage::submit(const std::string &title, const std::string &url, std::vector<Tab> &result_tabs) {
        auto body = create_body();
        get_chapters_for_manga(this, url, 0, body->items);
        result_tabs.push_back(Tab{std::move(body), std::make_unique<MangadexChaptersPage>(program, title, url), create_search_bar("Search...", SEARCH_DELAY_FILTER)});
        return PluginResult::OK;
    }

    PluginResult MangadexChaptersPage::submit(const std::string &title, const std::string &url, std::vector<Tab> &result_tabs) {
        Json::Value json_root;
        if(download_json(json_root, "https://api.mangadex.org/at-home/server/" + url, {}, true) != DownloadResult::OK)
            return PluginResult::NET_ERR;

        if(!json_root.isObject())
            return PluginResult::ERR;

        const Json::Value &base_url_json = json_root["baseUrl"];
        if(!base_url_json.isString())
            return PluginResult::ERR;

        std::string base_url = base_url_json.asString();
        if(!base_url.empty() && base_url.back() != '/')
            base_url += '/';

        auto image_urls = static_cast<MangadexChapterImagesList*>(submit_body_item->extra.get())->image_urls;
        for(auto &image_url : image_urls) {
            image_url = base_url + "data/" + image_url;
        }

        result_tabs.push_back(Tab{nullptr, std::make_unique<MangadexImagesPage>(program, content_title, title, content_url, image_urls), nullptr});
        return PluginResult::OK;
    }

    PluginResult MangadexChaptersPage::get_page(const std::string&, int page, BodyItems &result_items) {
        return get_chapters_for_manga(this, content_url, page, result_items);
    }

    bool MangadexChaptersPage::extract_id_from_url(const std::string &url, std::string &manga_id) const {
        size_t start_index = url.find("manga=");
        if(start_index == std::string::npos) {
            manga_id = url;
            return true;
        }

        start_index += 6;
        size_t end_index = url.find('&', start_index);
        if(end_index == std::string::npos) {
            manga_id = url.substr(start_index);
            return true;
        }
        
        manga_id = url.substr(start_index, end_index - start_index);
        return true;
    }

    ImageResult MangadexImagesPage::get_number_of_images(int &num_images) {
        num_images = image_urls.size();
        return ImageResult::OK;
    }

    ImageResult MangadexImagesPage::for_each_page_in_chapter(PageCallback callback) {
        for(const std::string &url : image_urls) {
            if(!callback(url))
                break;
        }
        return ImageResult::OK;
    }
}