#include "../../plugins/Mangatown.hpp"
#include "../../include/Notification.hpp"
#include "../../include/StringUtils.hpp"
#include "../../include/NetUtils.hpp"
#include <quickmedia/HtmlSearch.h>

static const std::string mangatown_url = "https://www.mangatown.com";

namespace QuickMedia {
    static bool is_number_with_zero_fill(const char *str) {
        while(*str == '0') { ++str; }
        return atoi(str) != 0;
    }

    static SearchResult search_page(const std::string &str, int page, BodyItems &result_items) {
        std::string url = "https://www.mangatown.com/search?name=";
        url += url_param_encode(str);
        url += "&page=" + std::to_string(page);

        std::string website_data;
        if(download_to_string(url, website_data, {}, true) != DownloadResult::OK)
            return SearchResult::NET_ERR;

        if(website_data.empty())
            return SearchResult::OK;

        QuickMediaHtmlSearch html_search;
        int result = quickmedia_html_search_init(&html_search, website_data.c_str());
        if(result != 0)
            goto cleanup;

        result = quickmedia_html_find_nodes_xpath(&html_search, "//p[class='title']/a",
            [](QuickMediaHtmlNode *node, void *userdata) {
                auto *item_data = (BodyItems*)userdata;
                const char *href = quickmedia_html_node_get_attribute_value(node, "href");
                const char *title = quickmedia_html_node_get_attribute_value(node, "title");
                if(href && title && strncmp(href, "/manga/", 7) == 0) {
                    auto item = BodyItem::create(strip(title));
                    item->url = mangatown_url + href;
                    item_data->push_back(std::move(item));
                }
            }, &result_items);

        BodyItemImageContext body_item_image_context;
        body_item_image_context.body_items = &result_items;
        body_item_image_context.index = 0;

        result = quickmedia_html_find_nodes_xpath(&html_search, "//a[class='manga_cover']/img",
            [](QuickMediaHtmlNode *node, void *userdata) {
                auto *item_data = (BodyItemImageContext*)userdata;
                const char *src = quickmedia_html_node_get_attribute_value(node, "src");
                if(src && item_data->index < item_data->body_items->size()) {
                    (*item_data->body_items)[item_data->index]->thumbnail_url = src;
                    item_data->index++;
                }
            }, &body_item_image_context);

        cleanup:
        quickmedia_html_search_deinit(&html_search);
        return SearchResult::OK;
    }

    SearchResult MangatownSearchPage::search(const std::string &str, BodyItems &result_items) {
        return search_page(str, 1, result_items);
    }

    PluginResult MangatownSearchPage::get_page(const std::string &str, int page, BodyItems &result_items) {
        return search_result_to_plugin_result(search_page(str, 1 + page, result_items));
    }

    PluginResult MangatownSearchPage::submit(const std::string &title, const std::string &url, std::vector<Tab> &result_tabs) {
        BodyItems chapters_items;

        std::string website_data;
        if(download_to_string(url, website_data, {}, true) != DownloadResult::OK)
            return PluginResult::NET_ERR;

        QuickMediaHtmlSearch html_search;
        int result = quickmedia_html_search_init(&html_search, website_data.c_str());
        if(result != 0)
            goto cleanup;

        result = quickmedia_html_find_nodes_xpath(&html_search, "//ul[class='chapter_list']//a",
            [](QuickMediaHtmlNode *node, void *userdata) {
                auto *item_data = (BodyItems*)userdata;
                const char *href = quickmedia_html_node_get_attribute_value(node, "href");
                const char *text = quickmedia_html_node_get_text(node);
                if(href && text && strncmp(href, "/manga/", 7) == 0) {
                    auto item = BodyItem::create(strip(text));
                    item->url = mangatown_url + href;
                    item_data->push_back(std::move(item));
                }
            }, &chapters_items);

        cleanup:
        quickmedia_html_search_deinit(&html_search);
        if(result != 0)
            return PluginResult::ERR;

        int chapter_num = chapters_items.size();
        for(auto &body_item : chapters_items) {
            body_item->set_title("Ch. " + std::to_string(chapter_num));
            chapter_num--;
        }

        auto body = create_body();
        body->items = std::move(chapters_items);
        result_tabs.push_back(Tab{std::move(body), std::make_unique<MangatownChaptersPage>(program, title, url), create_search_bar("Search...", SEARCH_DELAY_FILTER)});
        return PluginResult::OK;
    }

    PluginResult MangatownChaptersPage::submit(const std::string &title, const std::string &url, std::vector<Tab> &result_tabs) {
        result_tabs.push_back(Tab{nullptr, std::make_unique<MangatownImagesPage>(program, content_title, title, url), nullptr});
        return PluginResult::OK;
    }

    bool MangatownChaptersPage::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)
            return false;
        
        start_index += 7;
        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 MangatownImagesPage::get_number_of_images(int &num_images) {
        num_images = 0;
        ImageResult image_result = get_image_urls_for_chapter(url);
        if(image_result != ImageResult::OK)
            return image_result;

        num_images = chapter_image_urls.size();
        return ImageResult::OK;
    }

    ImageResult MangatownImagesPage::for_each_page_in_chapter(PageCallback callback) {
        int num_pages;
        ImageResult image_result = get_number_of_images(num_pages);
        if(image_result != ImageResult::OK)
            return image_result;

        for(const std::string &full_url : chapter_image_urls) {
            std::string image_src;
            std::string website_data;
            if(download_to_string_cache(full_url, website_data, {}, true) != DownloadResult::OK)
                break;

            QuickMediaHtmlSearch html_search;
            int result = quickmedia_html_search_init(&html_search, website_data.c_str());
            if(result != 0)
                goto cleanup;

            result = quickmedia_html_find_nodes_xpath(&html_search, "//div[id='viewer']//img",
                [](QuickMediaHtmlNode *node, void *userdata) {
                    std::string *image_src = (std::string*)userdata;
                    const char *src = quickmedia_html_node_get_attribute_value(node, "src");
                    if(src && strstr(src, "/store/manga/")) {
                        if(strncmp(src, "//", 2) == 0)
                            *image_src = src + 2;
                        else
                            *image_src = src;
                    }
                }, &image_src);

            cleanup:
            quickmedia_html_search_deinit(&html_search);

            if(result != 0)
                return ImageResult::ERR;

            if(image_src.empty())
                break;

            if(!callback(image_src))
                break;
        }

        return ImageResult::OK;
    }

    ImageResult MangatownImagesPage::get_image_urls_for_chapter(const std::string &url) {
        if(!chapter_image_urls.empty())
            return ImageResult::OK;

        int num_pages = 0;

        std::string website_data;
        if(download_to_string(url, website_data, {}, true) != DownloadResult::OK)
            return ImageResult::NET_ERR;

        QuickMediaHtmlSearch html_search;
        int result = quickmedia_html_search_init(&html_search, website_data.c_str());
        if(result != 0)
            goto cleanup;

        result = quickmedia_html_find_nodes_xpath(&html_search, "//div[class='page_select']//option",
            [](QuickMediaHtmlNode *node, void *userdata) {
                int *last_num_pages = (int*)userdata;
                const char *value = quickmedia_html_node_get_attribute_value(node, "value");
                const char *text = quickmedia_html_node_get_text(node);
                if(value && strncmp(value, "/manga/", 7) == 0) {
                    if(is_number_with_zero_fill(text)) {
                        (*last_num_pages)++;
                    }
                }
            }, &num_pages);

        num_pages /= 2;

        cleanup:
        quickmedia_html_search_deinit(&html_search);
        if(result != 0) {
            chapter_image_urls.clear();
            return ImageResult::ERR;
        }
        if(num_pages == 0)
            return ImageResult::ERR;
        for(int i = 0; i < num_pages; ++i) {
            chapter_image_urls.push_back(url + std::to_string(1 + i) + ".html");
        }
        return ImageResult::OK;
    }
}