const { SlashCommandBuilder, EmbedBuilder } = require('discord.js');
const { getUserRegistration, getBeatenGames, checkGameStorageId, getChangelog, getLeaderboardEntriesBetweenDates, getLeaderboardEntries } = require('../../databaseHelperFunctions');
const { getGameJson, getGenres, getCompanyInfo } = require('../../igdbHelperFunctions');

let userBeatenGamesDatabaseEntries = {};
let beatGameIGDBEntries = [];
let companies = [];

module.exports = {
	data: new SlashCommandBuilder()
	.setName('wrapped')
	.setDescription('Get your 2024 summary.')
	.addUserOption(option => option.setName('user').setDescription('The user to check')),
	async execute(interaction) {

		await interaction.deferReply();

        let user = interaction.user;
        const userOption = interaction.options.getUser('user');

        if (userOption) {
            user = userOption;
        }

		const userDatabaseEntry = await getUserRegistration(user);
		if (!userDatabaseEntry) return interaction.followUp({ content: `Issue checking registration with "${user.username}".`, ephemeral: true });

		await GetBeatenGamesForYear(userDatabaseEntry, 2024);

		if (!userBeatenGamesDatabaseEntries || userBeatenGamesDatabaseEntries.length === 0) {
			return interaction.followUp({ content: `${user.username} hasn't beaten any games in this time frame.`, ephemeral: false });
		}

		await GetIGDBEntries(userBeatenGamesDatabaseEntries);
		await GetDevelopers();

		const numberOfGamesBeat = await GetNumberOfGamesBeat();
		const averageBeatGameInterval = await GetAverageBeatInterval();
		const mostActiveMonth = await GetMostActiveMonth();
		const oldestGameBeat = await GetOldestGameBeat();
		const newestGameBeat = await GetNewestGameBeat();
		const averageGameAge = await GetAverageGameAge();
		const favouriteGameGenres = await GetFavouriteGenres();
		const favouriteGameDevs = await GetFavouriteDevelopers();
		const favouriteGamePublishers = await GetFavouritePublishers();
		const numberOfGamesDropped = await GetNumberOfDroppedGames(userDatabaseEntry);
		const yearLeaderboardPlace = await GetYearLeaderboardPosition(userDatabaseEntry);
		const currentLeaderboardPlace = await GetLeaderboardPosition(userDatabaseEntry);

		const embed = new EmbedBuilder();
        embed.setColor(0xD36918);
        embed.setTitle('The 100 Games Challenge: 2024 Wrapped');
		embed.setDescription(`Here are the stats for the games you played for the 100 Games Challenge in 2024 ${user.displayName}`);
        embed.setThumbnail(user.avatarURL());
		embed.setTimestamp();

		embed.addFields({ name: 'Number of Games Beat', value: numberOfGamesBeat.toString(), inline: true });
		embed.addFields({ name: 'Average Beat Interval', value: `${Math.round(averageBeatGameInterval).toString()} days`, inline: true });
		embed.addFields({ name: 'Most Active Month', value: mostActiveMonth, inline: true });
		embed.addFields({ name: 'Number Of Games Dropped', value: numberOfGamesDropped, inline: true });
		embed.addFields({ name: 'Yearly Leaderboard', value: yearLeaderboardPlace, inline: true });
		embed.addFields({ name: 'Overall Leaderboard', value: currentLeaderboardPlace, inline: true });
		embed.addFields({ name: 'Oldest Beat Game', value: oldestGameBeat });
		embed.addFields({ name: 'Newest Beat Game', value: newestGameBeat });
		embed.addFields({ name: 'Average Game Age', value: averageGameAge });
		embed.addFields({ name: 'Favourite Game Genres', value: favouriteGameGenres });
		embed.addFields({ name: 'Favourite Game Developers', value: favouriteGameDevs });
		embed.addFields({ name: 'Favourite Game Publisher', value: favouriteGamePublishers });

		return interaction.followUp({ embeds: [embed] });
	},
};

function FilterByMonth(array, targetMonth) {
	return array.filter(entry => {
		const date = new Date(entry.updatedAt);
		return date.getMonth() === targetMonth;
	});
}

function FilterByYear(array, targetYear) {
	return array.filter(entry => {
		const date = new Date(entry.updatedAt);
		return date.getFullYear() === targetYear;
	});
}

async function GetBeatenGamesForYear(userDatabaseEntry, year) {
	userBeatenGamesDatabaseEntries = await getBeatenGames(userDatabaseEntry.id);

	if (userBeatenGamesDatabaseEntries && userBeatenGamesDatabaseEntries.length > 0) {
		userBeatenGamesDatabaseEntries = FilterByYear(userBeatenGamesDatabaseEntries, year);
	}
}

async function GetIGDBEntries(array) {
	beatGameIGDBEntries = [];

	for (let i = 0; i < array.length; i++) {
		const game = await checkGameStorageId(array[i].gameId);
		const json = await getGameJson(String.prototype.concat('where id = ', game.igdb_id, '; fields *;'));
		beatGameIGDBEntries.push(json[0]);
	}
}

async function GetDevelopers() {
	companies = [];

	for (let i = 0; i < beatGameIGDBEntries.length; i++) {
		for (let j = 0; j < beatGameIGDBEntries[i].involved_companies.length; j++) {

			if (!companies.find(item => item.id === beatGameIGDBEntries[i].involved_companies[j])) {
				const company = await getCompanyInfo(beatGameIGDBEntries[i].involved_companies[j]);
				companies.push(company);
			}
		}
	}
}

async function GetNumberOfGamesBeat() {
	if (userBeatenGamesDatabaseEntries) {
		return userBeatenGamesDatabaseEntries.length;
	}

	return 0;
}

async function GetAverageBeatInterval() {
	if (userBeatenGamesDatabaseEntries && userBeatenGamesDatabaseEntries.length > 0) {
		const today = new Date();
		const start = new Date(2024, 0, 1);
		const days = (today - start) / (1000 * 60 * 60 * 24);
		const timepergame = days / userBeatenGamesDatabaseEntries.length;
		return Math.round(timepergame);
	}

	return 0;
}

async function GetMostActiveMonth() {
	if (userBeatenGamesDatabaseEntries && userBeatenGamesDatabaseEntries.length > 0) {
		let mostActiveMonth = [];

		for (let i = 0; i < 12; i++) {
			const month = FilterByMonth(userBeatenGamesDatabaseEntries, i);
			if (month.length > mostActiveMonth.length) {
				mostActiveMonth = month;
			}
		}

		return String.prototype.concat(mostActiveMonth[0].updatedAt.toLocaleDateString('en-GB', { month: 'long' }), ' (', mostActiveMonth.length.toString(), ' games)');
	}

	return '';
}

async function GetOldestGameBeat() {
	if (beatGameIGDBEntries.length > 0) {
		let oldestGame = beatGameIGDBEntries[0];

		for (let i = 1; i < beatGameIGDBEntries.length; i++) {
			if (beatGameIGDBEntries[i].first_release_date < oldestGame.first_release_date) {
				oldestGame = beatGameIGDBEntries[i];
			}
		}

		const gameName = oldestGame.name;
		const gameReleaseDate = new Intl.DateTimeFormat('en-GB', { dateStyle: 'full' }).format(oldestGame.first_release_date * 1000);
		return gameName + ' *(' + gameReleaseDate + ')*';
	}
	return '';
}

async function GetNewestGameBeat() {
	if (beatGameIGDBEntries.length > 0) {
		let newestGame = beatGameIGDBEntries[0];

		for (let i = 1; i < beatGameIGDBEntries.length; i++) {
			if (beatGameIGDBEntries[i].first_release_date > newestGame.first_release_date) {
				newestGame = beatGameIGDBEntries[i];
			}
		}

		const gameName = newestGame.name;
		const gameReleaseDate = new Intl.DateTimeFormat('en-GB', { dateStyle: 'full' }).format(newestGame.first_release_date * 1000);
		return gameName + ' *(' + gameReleaseDate + ')*';
	}
	return '';
}

async function GetAverageGameAge() {
	if (beatGameIGDBEntries.length > 0) {
		let averageGameAge = 0;

		for (let i = 0; i < beatGameIGDBEntries.length; i++) {
			averageGameAge += beatGameIGDBEntries[i].first_release_date;
		}

		averageGameAge /= beatGameIGDBEntries.length;
		averageGameAge = new Date(averageGameAge * 1000);
		const today = new Date();
		let year = today.getFullYear() - averageGameAge.getFullYear();
		let month = today.getMonth() - averageGameAge.getMonth();
		let day = today.getDate() - averageGameAge.getDate();

		if (month < 0) {
			year--;
			month += 12;
		}

		if (day < 0) {
			month--;
			const previousMonth = new Date(today.getFullYear(), today.getMonth(), 0);
			day += previousMonth.getDate();
		}


		return `${year} years, ${month} months, ${day} days old`;
	}
	return '';
}

async function GetFavouriteGenres() {
	const genres = [];
	const counts = [];
	for (let i = 0; i < beatGameIGDBEntries.length; i++) {
		for (let j = 0; j < beatGameIGDBEntries[i].genres.length; j++) {
			const genre = await getGenres(beatGameIGDBEntries[i].genres[j]);
			genres.push(genre);
		}
	}

	genres.forEach(item => {
		counts[item] = (counts[item] || 0) + 1;
	});

	const keys = Object.keys(counts);

	let string = '';
	for (let i = 0; i < keys.length && i < 3; i++) {
		const genre = keys[i];

		if (counts[genre] >= 1) {
			string = string.concat(` ${genre} (${counts[genre]} games),`);
		}
	}
	string = string.slice(1, -1);

	return string;
}

async function GetFavouriteDevelopers() {
	const developers = [];
	const counts = [];
	for (let i = 0; i < beatGameIGDBEntries.length; i++) {
		for (let j = 0; j < companies.length; j++) {
			if (companies[j].developed) {
				const developedGames = companies[j].developed;
				if (developedGames.find(item => item === beatGameIGDBEntries[i].id)) {
					developers.push(companies[j].name);
				}
			}
		}
	}

	developers.forEach(item => {
		counts[item] = (counts[item] || 0) + 1;
	});

	const keys = Object.keys(counts);

	let string = '';
	for (let i = 0; i < keys.length && i < 3; i++) {
		const developer = keys[i];

		if (counts[developer] >= 1) {
			string = string.concat(` ${developer} (${counts[developer] } games),`);
		}
	}
	string = string.slice(1, -1);

	return string;
}

async function GetFavouritePublishers() {
	const publishers = [];
	const counts = [];
	for (let i = 0; i < beatGameIGDBEntries.length; i++) {
		for (let j = 0; j < companies.length; j++) {
			if (companies[j].published)	{
				const developedGames = companies[j].published;
				if (developedGames.find(item => item === beatGameIGDBEntries[i].id)) {
					publishers.push(companies[j].name);
				}
			}
		}
	}

	publishers.forEach(item => {
		counts[item] = (counts[item] || 0) + 1;
	});

	const keys = Object.keys(counts);

	let string = '';
	for (let i = 0; i < keys.length && i < 3; i++) {
		const publisher = keys[i];

		if (counts[publisher] >= 1) {
			string = string.concat(` ${publisher} (${counts[publisher] } games),`);
		}
	}
	string = string.slice(1, -1);

	return string;
}

async function GetNumberOfDroppedGames(userDatabaseEntry) {
	const userChangelog = await getChangelog(userDatabaseEntry.id);
	const droppedGames = userChangelog.filter(item => item.oldStatus === 'playing' && item.newStatus === null);

	if (droppedGames) {
		return droppedGames.length.toString();
	}

	return '0';
}

async function GetYearLeaderboardPosition(userDatabaseEntry) {
	const leaderboard = await getLeaderboardEntriesBetweenDates('2024-01-01', '2024-12-31');
	const index = leaderboard.findIndex(item => item.username === userDatabaseEntry.username) + 1;
	return await appendOrdinalSuffix(index);
}

async function GetLeaderboardPosition(userDatabaseEntry) {
	const leaderboard = await getLeaderboardEntries();
	const index = leaderboard.findIndex(item => item.username === userDatabaseEntry.username) + 1;
	return await appendOrdinalSuffix(index);
}

async function appendOrdinalSuffix(number) {
	const lastDigit = number % 10;
	const lastTwoDigits = number % 100;

	// Handle special case for 11th, 12th, 13th, etc.
	if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
		return number + 'th';
	}

	// Handle the common cases for 1st, 2nd, 3rd
	switch (lastDigit) {
		case 1:
			return number + 'st';
		case 2:
			return number + 'nd';
		case 3:
			return number + 'rd';
		default:
			return number + 'th';
	}
}