#include "blankie/murl.h"
#include "numberhelper.h"
#include "pixivclient.h"

static const constexpr char* touch_user_agent = "Mozilla/5.0 (Android 12; Mobile; rv:97.0) Gecko/97.0 Firefox/97.0";
static const constexpr char* desktop_user_agent = "Mozilla/5.0 (Windows NT 10.0; rv:111.0) Gecko/20100101 Firefox/111.0";

PixivClient::PixivClient() {
    this->_www_pixiv_net_client.set_keep_alive(true);
    this->_www_pixiv_net_client.set_default_headers({
        {"Cookie", "webp_available=1"}
    });
}

User PixivClient::get_user(uint64_t user_id) {
    httplib::Result res = this->_www_pixiv_net_client.Get("/touch/ajax/user/details", {
        {"lang", "en"}, {"id", std::to_string(user_id)}
    }, {{"User-Agent", touch_user_agent}});
    return this->_handle_result(std::move(res)).at("user_details").get<User>();
}

Illusts PixivClient::get_illusts(uint64_t user_id, size_t page) {
    httplib::Params params = {{"lang", "en"}, {"id", std::to_string(user_id)}};
    if (page != 0) {
        params.insert({"p", std::to_string(page + 1)});
    }
    httplib::Result res = this->_www_pixiv_net_client.Get("/touch/ajax/user/illusts", std::move(params), {{"User-Agent", touch_user_agent}});
    return this->_handle_result(std::move(res)).get<Illusts>();
}

Illust PixivClient::get_illust(uint64_t illust_id) {
    httplib::Result res = this->_www_pixiv_net_client.Get("/touch/ajax/illust/details", {
        {"lang", "en"}, {"illust_id", std::to_string(illust_id)}
    }, {{"User-Agent", touch_user_agent}});
    return this->_handle_result(std::move(res)).get<Illust>();
}

SearchResults PixivClient::search_illusts(const std::string& query, size_t page, const std::string& order) {
    using namespace std::string_literals;

    httplib::Result res = this->_www_pixiv_net_client.Get("/ajax/search/illustrations/"s + blankie::murl::escape(query), {
        {"lang", "en"},
        {"mode", "all"},
        {"p", std::to_string(page + 1)},
        {"s_mode", "s_tag_full"},
        {"type", "illust_and_ugoira"},
        {"order", order},
        {"word", query}
    }, {{"User-Agent", desktop_user_agent}});
    return this->_handle_result(std::move(res)).get<SearchResults>();
}

std::vector<SearchSuggestion> PixivClient::get_search_suggestions(const std::string& query) {
    httplib::Result res = this->_www_pixiv_net_client.Get("/rpc/cps.php", {
        {"lang", "en"}, {"keyword", query}
    }, {{"User-Agent", desktop_user_agent}, {"Referer", "https://www.pixiv.net/"}});
    if (!res) {
        throw HTTPLibException(res.error());
    }
    nlohmann::json j = nlohmann::json::parse(std::move(res->body)).at("candidates");

    std::vector<SearchSuggestion> search_suggestions;
    search_suggestions.reserve(j.size());

    for (const nlohmann::json& i : j) {
        SearchSuggestion search_suggestion = i.get<SearchSuggestion>();
        if (search_suggestion.tag != query) {
            search_suggestions.push_back(std::move(search_suggestion));
        }
    }

    return search_suggestions;
}

nlohmann::json PixivClient::_handle_result(httplib::Result res) {
    if (!res) {
        throw HTTPLibException(res.error());
    }

    nlohmann::json j = nlohmann::json::parse(std::move(res->body));
    if (j.at("error")) {
        throw PixivException(res->status, j.at("message").get<std::string>());
    }
    return j.at("body");
}