#include "services/anilist.h"
#include "core/anime.h"
#include "core/anime_db.h"
#include "core/config.h"
#include "core/json.h"
#include "core/session.h"
#include "core/strings.h"
#include "gui/translate/anilist.h"
#include <QDesktopServices>
#include <QInputDialog>
#include <QLineEdit>
#include <QMessageBox>
#include <QUrl>
#include <chrono>
#include <curl/curl.h>
#include <exception>
#include <format>
#define CLIENT_ID "13706"

using nlohmann::literals::operator"" _json_pointer;

namespace Services::AniList {

class Account {
	public:
		std::string Username() const { return session.config.anilist.username; }
		void SetUsername(std::string const& username) {
			session.config.anilist.username = username;
		}

		int UserId() const { return session.config.anilist.user_id; }
		void SetUserId(const int id) { session.config.anilist.user_id = id; }

		std::string AuthToken() const { return session.config.anilist.auth_token; }
		void SetAuthToken(std::string const& auth_token) {
			session.config.anilist.auth_token = auth_token;
		}

		bool Authenticated() const { return !AuthToken().empty(); }
};

static Account account;

static size_t CurlWriteCallback(void* contents, size_t size, size_t nmemb, void* userdata) {
	((std::string*)userdata)->append((char*)contents, size * nmemb);
	return size * nmemb;
}

/* A wrapper around cURL to send requests to AniList */
std::string SendRequest(std::string data) {
	struct curl_slist* list = NULL;
	std::string userdata;
	CURL* curl = curl_easy_init();
	if (curl) {
		std::string bearer = "Authorization: Bearer " + account.AuthToken();
		list = curl_slist_append(list, "Accept: application/json");
		list = curl_slist_append(list, "Content-Type: application/json");
		list = curl_slist_append(list, bearer.c_str());
		curl_easy_setopt(curl, CURLOPT_URL, "https://graphql.anilist.co");
		curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data.c_str());
		curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
		curl_easy_setopt(curl, CURLOPT_WRITEDATA, &userdata);
		curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &CurlWriteCallback);
		/* Use system certs... useful on Windows. */
		curl_easy_setopt(curl, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NATIVE_CA);
		CURLcode res = curl_easy_perform(curl);
		curl_slist_free_all(list);
		curl_easy_cleanup(curl);
		if (res != CURLE_OK) {
			QMessageBox box(QMessageBox::Icon::Critical, "",
			                QString("curl_easy_perform(curl) failed!: ") +
			                    QString(curl_easy_strerror(res)));
			box.exec();
			return "";
		}
		return userdata;
	}
	return "";
}

void ParseListStatus(std::string status, Anime::Anime& anime) {
	std::unordered_map<std::string, Anime::ListStatus> map = {
	    {"CURRENT",   Anime::ListStatus::CURRENT  },
	    {"PLANNING",  Anime::ListStatus::PLANNING },
	    {"COMPLETED", Anime::ListStatus::COMPLETED},
	    {"DROPPED",   Anime::ListStatus::DROPPED  },
	    {"PAUSED",    Anime::ListStatus::PAUSED   }
    };

	if (status == "REPEATING") {
		anime.SetUserIsRewatching(true);
		anime.SetUserStatus(Anime::ListStatus::CURRENT);
		return;
	}

	if (!map.contains(status)) {
		anime.SetUserStatus(Anime::ListStatus::NOT_IN_LIST);
		return;
	}

	anime.SetUserStatus(map[status]);
}

std::string ListStatusToString(const Anime::Anime& anime) {
	std::unordered_map<Anime::ListStatus, std::string> map = {
	    {Anime::ListStatus::CURRENT,   "CURRENT"  },
	    {Anime::ListStatus::PLANNING,  "PLANNING" },
	    {Anime::ListStatus::COMPLETED, "COMPLETED"},
	    {Anime::ListStatus::DROPPED,   "DROPPED"  },
	    {Anime::ListStatus::PAUSED,    "PAUSED"   }
    };

	if (anime.GetUserIsRewatching())
		return "REWATCHING";

	if (!map.contains(anime.GetUserStatus()))
		return "CURRENT";
	return map[anime.GetUserStatus()];
}

Date ParseDate(const nlohmann::json& json) {
	Date date;
	if (json.contains("/year"_json_pointer) && json.at("/year"_json_pointer).is_number())
		date.SetYear(JSON::GetInt(json, "/year"_json_pointer));
	else
		date.VoidYear();

	if (json.contains("/month"_json_pointer) && json.at("/month"_json_pointer).is_number())
		date.SetMonth(JSON::GetInt(json, "/month"_json_pointer));
	else
		date.VoidMonth();

	if (json.contains("/day"_json_pointer) && json.at("/day"_json_pointer).is_number())
		date.SetDay(JSON::GetInt(json, "/day"_json_pointer));
	else
		date.VoidDay();
	return date;
}

void ParseTitle(const nlohmann::json& json, Anime::Anime& anime) {
	anime.SetNativeTitle(JSON::GetString(json, "/native"_json_pointer));
	anime.SetEnglishTitle(JSON::GetString(json, "/english"_json_pointer));
	anime.SetRomajiTitle(JSON::GetString(json, "/romaji"_json_pointer));
}

int ParseMediaJson(const nlohmann::json& json) {
	int id = JSON::GetInt(json, "/id"_json_pointer);
	if (!id)
		return 0;
	Anime::Anime& anime = Anime::db.items[id];
	anime.SetId(id);

	ParseTitle(json.at("/title"_json_pointer), anime);

	anime.SetEpisodes(JSON::GetInt(json, "/episodes"_json_pointer));
	anime.SetFormat(Translate::AniList::ToSeriesFormat(JSON::GetString(json, "/format"_json_pointer)));

	anime.SetAiringStatus(Translate::AniList::ToSeriesStatus(JSON::GetString(json, "/status"_json_pointer)));

	anime.SetAirDate(ParseDate(json["/startDate"_json_pointer]));

	anime.SetAudienceScore(JSON::GetInt(json, "/averageScore"_json_pointer));
	anime.SetSeason(Translate::AniList::ToSeriesSeason(JSON::GetString(json, "/season"_json_pointer)));
	anime.SetDuration(JSON::GetInt(json, "/duration"_json_pointer));
	anime.SetSynopsis(Strings::TextifySynopsis(JSON::GetString(json, "/description"_json_pointer)));

	if (json.contains("/genres"_json_pointer) && json["/genres"_json_pointer].is_array())
		anime.SetGenres(json["/genres"_json_pointer].get<std::vector<std::string>>());
	if (json.contains("/synonyms"_json_pointer) && json["/synonyms"_json_pointer].is_array())
		anime.SetTitleSynonyms(json["/synonyms"_json_pointer].get<std::vector<std::string>>());
	return id;
}

int ParseListItem(const nlohmann::json& json) {
	int id = ParseMediaJson(json["media"]);

	Anime::Anime& anime = Anime::db.items[id];

	anime.AddToUserList();

	anime.SetUserScore(JSON::GetInt(json, "/score"_json_pointer));
	anime.SetUserProgress(JSON::GetInt(json, "/progress"_json_pointer));
	ParseListStatus(JSON::GetString(json, "/status"_json_pointer), anime);
	anime.SetUserNotes(JSON::GetString(json, "/notes"_json_pointer));

	anime.SetUserDateStarted(ParseDate(json["/startedAt"_json_pointer]));
	anime.SetUserDateCompleted(ParseDate(json["/completedAt"_json_pointer]));

	anime.SetUserTimeUpdated(JSON::GetInt(json, "/updatedAt"_json_pointer));

	return id;
}

int ParseList(const nlohmann::json& json) {
	for (const auto& entry : json["entries"].items()) {
		ParseListItem(entry.value());
	}
	return 1;
}

int GetAnimeList() {
	/* NOTE: these should be in the qrc file */
	const std::string query = "query ($id: Int) {\n"
	                          "  MediaListCollection (userId: $id, type: ANIME) {\n"
	                          "    lists {\n"
	                          "      name\n"
	                          "      entries {\n"
	                          "        score\n"
	                          "        notes\n"
	                          "        status\n"
	                          "        progress\n"
	                          "        startedAt {\n"
	                          "          year\n"
	                          "          month\n"
	                          "          day\n"
	                          "        }\n"
	                          "        completedAt {\n"
	                          "          year\n"
	                          "          month\n"
	                          "          day\n"
	                          "        }\n"
	                          "        updatedAt\n"
	                          "        media {\n"
	                          "          id\n"
	                          "          title {\n"
	                          "            romaji\n"
	                          "            english\n"
	                          "            native\n"
	                          "          }\n"
	                          "          format\n"
	                          "          status\n"
	                          "          averageScore\n"
	                          "          season\n"
	                          "          startDate {\n"
	                          "            year\n"
	                          "            month\n"
	                          "            day\n"
	                          "          }\n"
	                          "          genres\n"
	                          "          episodes\n"
	                          "          duration\n"
	                          "          synonyms\n"
	                          "          description(asHtml: false)\n"
	                          "        }\n"
	                          "      }\n"
	                          "    }\n"
	                          "  }\n"
	                          "}\n";
	// clang-format off
	nlohmann::json json = {
		{"query", query},
		{"variables", {
			{"id", account.UserId()}
		}}
	};
	// clang-format on
	/* TODO: do a try catch here, catch any json errors and then call
	   Authorize() if needed */
	auto res = nlohmann::json::parse(SendRequest(json.dump()));
	/* TODO: make sure that we actually need the wstring converter and see
	   if we can just get wide strings back from nlohmann::json */
	for (const auto& list : res["data"]["MediaListCollection"]["lists"].items()) {
		ParseList(list.value());
	}
	return 1;
}

int UpdateAnimeEntry(const Anime::Anime& anime) {
	/**
	 * possible values:
	 *
	 * int mediaId,
	 * MediaListStatus status,
	 * float score,
	 * int scoreRaw,
	 * int progress,
	 * int progressVolumes,
	 * int repeat,
	 * int priority,
	 * bool private,
	 * string notes,
	 * bool hiddenFromStatusLists,
	 * string[] customLists,
	 * float[] advancedScores,
	 * Date startedAt,
	 * Date completedAt
	 **/
	const std::string query = "mutation ($media_id: Int, $progress: Int, $status: MediaListStatus, "
	                          "$score: Int, $notes: String) {\n"
	                          "  SaveMediaListEntry (mediaId: $media_id, progress: $progress, "
	                          "status: $status, scoreRaw: $score, notes: "
	                          "$notes) {\n"
	                          "    id\n"
	                          "  }\n"
	                          "}\n";
	// clang-format off
	nlohmann::json json = {
		{"query", query},
		{"variables", {
			{"media_id", anime.GetId()},
			{"progress", anime.GetUserProgress()},
			{"status",   ListStatusToString(anime)},
			{"score",    anime.GetUserScore()},
			{"notes",    anime.GetUserNotes()}
		}}
	};
	// clang-format on
	SendRequest(json.dump());
	return 1;
}

int ParseUser(const nlohmann::json& json) {
	account.SetUsername(JSON::GetString(json, "/name"_json_pointer));
	account.SetUserId(JSON::GetInt(json, "/id"_json_pointer));
	return account.UserId();
}

int AuthorizeUser() {
	/* Prompt for PIN */
	QDesktopServices::openUrl(QUrl("https://anilist.co/api/v2/oauth/authorize?client_id=" CLIENT_ID
	                               "&response_type=token"));
	bool ok;
	QString token = QInputDialog::getText(
	    0, "Credentials needed!",
	    "Please enter the code given to you after logging in to AniList:", QLineEdit::Normal, "",
	    &ok);
	if (ok && !token.isEmpty())
		account.SetAuthToken(token.toStdString());
	else // fail
		return 0;
	const std::string query = "query {\n"
	                          "  Viewer {\n"
	                          "    id\n"
	                          "    name\n"
	                          "    mediaListOptions {\n"
	                          "      scoreFormat\n"
	                          "    }\n"
	                          "  }\n"
	                          "}\n";
	nlohmann::json json = {
	    {"query", query}
    };
	auto ret = nlohmann::json::parse(SendRequest(json.dump()));
	ParseUser(json["Viewer"]);
	return 1;
}

} // namespace Services::AniList