import { isFuture } from "date-fns";
import { sql } from "kysely";
import { jsonArrayFrom, jsonObjectFrom } from "kysely/helpers/sqlite";
import { db } from "~/db/sql";
import type { Tables, TablesInsertable } from "~/db/tables";
import {
	databaseTimestampNow,
	databaseTimestampToDate,
	dateToDatabaseTimestamp,
} from "~/utils/dates";
import {
	COMMON_USER_FIELDS,
	concatUserSubmittedImagePrefix,
	tournamentLogoWithDefault,
} from "~/utils/kysely.server";
import { mySlugify } from "~/utils/urls";
import { TOURNAMENT_SERIES_EVENTS_PER_PAGE } from "./tournament-organization-constants";

interface CreateArgs {
	ownerId: number;
	name: string;
}

export function create(args: CreateArgs) {
	return db.transaction().execute(async (trx) => {
		const org = await trx
			.insertInto("TournamentOrganization")
			.values({
				name: args.name,
				slug: mySlugify(args.name),
			})
			.returning(["id", "slug"])
			.executeTakeFirstOrThrow();

		await trx
			.insertInto("TournamentOrganizationMember")
			.values({
				organizationId: org.id,
				userId: args.ownerId,
				role: "ADMIN",
			})
			.execute();

		return org;
	});
}

export async function findBySlug(slug: string) {
	const organization = await db
		.selectFrom("TournamentOrganization")
		.leftJoin(
			"UserSubmittedImage",
			"UserSubmittedImage.id",
			"TournamentOrganization.avatarImgId",
		)
		.select(({ eb }) => [
			"TournamentOrganization.id",
			"TournamentOrganization.name",
			"TournamentOrganization.description",
			"TournamentOrganization.socials",
			"TournamentOrganization.slug",
			"TournamentOrganization.isEstablished",
			concatUserSubmittedImagePrefix(eb.ref("UserSubmittedImage.url")).as(
				"avatarUrl",
			),
			jsonArrayFrom(
				eb
					.selectFrom("TournamentOrganizationMember")
					.innerJoin("User", "User.id", "TournamentOrganizationMember.userId")
					.select([
						"TournamentOrganizationMember.role",
						"TournamentOrganizationMember.roleDisplayName",
						...COMMON_USER_FIELDS,
					])
					.whereRef(
						"TournamentOrganizationMember.organizationId",
						"=",
						"TournamentOrganization.id",
					)
					.orderBy(
						sql`coalesce(TournamentOrganizationMember.roleDisplayName, TournamentOrganizationMember.role)`,
						"asc",
					)
					.orderBy("User.username", "asc"),
			).as("members"),
			jsonArrayFrom(
				eb
					.selectFrom("TournamentOrganizationSeries")
					.select([
						"TournamentOrganizationSeries.id",
						"TournamentOrganizationSeries.name",
						"TournamentOrganizationSeries.substringMatches",
						"TournamentOrganizationSeries.showLeaderboard",
						"TournamentOrganizationSeries.description",
					])
					.whereRef(
						"TournamentOrganizationSeries.organizationId",
						"=",
						"TournamentOrganization.id",
					),
			).as("series"),
			jsonArrayFrom(
				eb
					.selectFrom("TournamentOrganizationBadge")
					.innerJoin("Badge", "Badge.id", "TournamentOrganizationBadge.badgeId")
					.select(["Badge.id", "Badge.displayName", "Badge.code", "Badge.hue"])
					.whereRef(
						"TournamentOrganizationBadge.organizationId",
						"=",
						"TournamentOrganization.id",
					),
			).as("badges"),
		])
		.where("TournamentOrganization.slug", "=", slug)
		.executeTakeFirst();

	if (!organization) return null;

	const orgAdminUserIds = organization.members
		.filter((member) => member.role === "ADMIN")
		.map((member) => member.id);

	return {
		...organization,
		permissions: {
			EDIT: orgAdminUserIds,
			BAN: orgAdminUserIds,
		},
	};
}

export function findByUserId(
	userId: number,
	{
		roles = [],
	}: {
		/** If set, filters organizations by user's org member role */
		roles?: Array<Tables["TournamentOrganizationMember"]["role"]>;
	} = {},
) {
	return db
		.selectFrom("TournamentOrganizationMember")
		.innerJoin(
			"TournamentOrganization",
			"TournamentOrganization.id",
			"TournamentOrganizationMember.organizationId",
		)
		.select([
			"TournamentOrganization.id",
			"TournamentOrganization.name",
			"TournamentOrganization.isEstablished",
		])
		.where("TournamentOrganizationMember.userId", "=", userId)
		.$if(roles.length > 0, (qb) =>
			qb.where("TournamentOrganizationMember.role", "in", roles),
		)
		.orderBy("TournamentOrganization.id", "asc")
		.execute();
}

interface FindEventsByMonthArgs {
	month: number;
	year: number;
	organizationId: number;
}

const findEventsBaseQuery = (organizationId: number) =>
	db
		.selectFrom("CalendarEvent")
		.innerJoin(
			"CalendarEventDate",
			"CalendarEventDate.eventId",
			"CalendarEvent.id",
		)
		.select(({ eb }) => [
			"CalendarEvent.id as eventId",
			"CalendarEvent.name",
			"CalendarEvent.tournamentId",
			eb.fn.min("CalendarEventDate.startTime").as("startTime"),
			tournamentLogoWithDefault(eb).as("logoUrl"),
			jsonObjectFrom(
				eb
					.selectFrom("TournamentResult")
					.innerJoin(
						"TournamentTeam",
						"TournamentTeam.id",
						"TournamentResult.tournamentTeamId",
					)
					.leftJoin("AllTeam", "TournamentTeam.teamId", "AllTeam.id")
					.leftJoin("UserSubmittedImage as u1", "AllTeam.avatarImgId", "u1.id")
					.leftJoin(
						"UserSubmittedImage as u2",
						"TournamentTeam.avatarImgId",
						"u2.id",
					)
					.select(({ eb: innerEb }) => [
						"TournamentTeam.name",
						concatUserSubmittedImagePrefix(
							innerEb.fn.coalesce("u1.url", "u2.url"),
						).as("avatarUrl"),
						jsonArrayFrom(
							innerEb
								.selectFrom("TournamentTeamMember")
								.innerJoin("User", "User.id", "TournamentTeamMember.userId")
								.select(["User.discordAvatar", "User.discordId"])
								.whereRef(
									"TournamentTeamMember.tournamentTeamId",
									"=",
									"TournamentTeam.id",
								)
								.orderBy("User.id", "asc"),
						).as("members"),
					])
					.whereRef(
						"TournamentResult.tournamentId",
						"=",
						"CalendarEvent.tournamentId",
					)
					.where("TournamentResult.placement", "=", 1),
			).as("tournamentWinners"),
			jsonObjectFrom(
				eb
					.selectFrom("CalendarEventResultTeam")
					.select(({ eb: innerEb }) => [
						"CalendarEventResultTeam.name",
						sql<null>`null`.as("avatarUrl"),
						jsonArrayFrom(
							innerEb
								.selectFrom("CalendarEventResultPlayer")
								.innerJoin(
									"User",
									"User.id",
									"CalendarEventResultPlayer.userId",
								)
								.select(["User.discordAvatar", "User.discordId"])
								.whereRef(
									"CalendarEventResultPlayer.teamId",
									"=",
									"CalendarEventResultTeam.id",
								)
								.orderBy("User.id", "asc"),
						).as("members"),
					])
					.whereRef("CalendarEventResultTeam.eventId", "=", "CalendarEvent.id")
					.where("CalendarEventResultTeam.placement", "=", 1),
			).as("eventWinners"),
		])
		.where("CalendarEvent.organizationId", "=", organizationId)
		.where("CalendarEvent.hidden", "=", 0)
		.groupBy("CalendarEvent.id");

const mapEvent = <
	T extends {
		tournamentId: number | null;
		logoUrl: string;
		name: string;
	},
>(
	event: T,
) => {
	return {
		...event,
		logoUrl: !event.tournamentId ? null : event.logoUrl,
	};
};

export async function findEventsByMonth({
	month,
	year,
	organizationId,
}: FindEventsByMonthArgs) {
	const firstDayOfTheMonth = new Date(Date.UTC(year, month, 1));
	const lastDayOfTheMonth = new Date(Date.UTC(year, month + 1, 0));

	// a bit of margin for timezones, filtered in the frontend code
	firstDayOfTheMonth.setUTCDate(firstDayOfTheMonth.getUTCDate() - 1);
	lastDayOfTheMonth.setUTCDate(lastDayOfTheMonth.getUTCDate() + 1);

	const events = await findEventsBaseQuery(organizationId)
		.where(
			"CalendarEventDate.startTime",
			">=",
			dateToDatabaseTimestamp(firstDayOfTheMonth),
		)
		.where(
			"CalendarEventDate.startTime",
			"<=",
			dateToDatabaseTimestamp(lastDayOfTheMonth),
		)
		.orderBy("CalendarEventDate.startTime", "asc")
		.execute();

	return events.map(mapEvent);
}

export function findAllUnfinalizedEvents(organizationId: number) {
	return db
		.selectFrom("Tournament")
		.innerJoin("CalendarEvent", "CalendarEvent.tournamentId", "Tournament.id")
		.select(["Tournament.id"])
		.where("Tournament.isFinalized", "=", 0)
		.where("CalendarEvent.organizationId", "=", organizationId)
		.execute();
}

const findSeriesEventsBaseQuery = ({
	organizationId,
	substringMatches,
}: {
	organizationId: number;
	substringMatches: string[];
}) =>
	findEventsBaseQuery(organizationId)
		.where((eb) =>
			eb.or(
				substringMatches.map((match) =>
					eb("CalendarEvent.name", "like", `%${match}%`),
				),
			),
		)
		.orderBy("CalendarEventDate.startTime", "desc");

export async function findPaginatedEventsBySeries({
	organizationId,
	substringMatches,
	page,
}: {
	organizationId: number;
	substringMatches: string[];
	page: number;
}) {
	const events = await findSeriesEventsBaseQuery({
		organizationId,
		substringMatches,
	})
		.limit(TOURNAMENT_SERIES_EVENTS_PER_PAGE)
		.offset((page - 1) * TOURNAMENT_SERIES_EVENTS_PER_PAGE)
		.execute();

	return events.map(mapEvent);
}

export async function findAllEventsBySeries({
	organizationId,
	substringMatches,
}: {
	organizationId: number;
	substringMatches: string[];
}) {
	const events = await findSeriesEventsBaseQuery({
		organizationId,
		substringMatches,
	}).execute();

	return events.map(mapEvent);
}

interface UpdateArgs
	extends Pick<
		Tables["TournamentOrganization"],
		"id" | "name" | "description" | "socials"
	> {
	members: Array<
		Pick<
			Tables["TournamentOrganizationMember"],
			"role" | "roleDisplayName" | "userId"
		>
	>;
	series: Array<
		Pick<Tables["TournamentOrganizationSeries"], "description" | "name"> & {
			showLeaderboard: boolean;
		}
	>;
	badges: number[];
}

export function update({
	id,
	name,
	description,
	socials,
	members,
	series,
	badges,
}: UpdateArgs) {
	return db.transaction().execute(async (trx) => {
		const updatedOrg = await trx
			.updateTable("TournamentOrganization")
			.set({
				name,
				description,
				slug: mySlugify(name),
				socials: socials ? JSON.stringify(socials) : null,
			})
			.where("id", "=", id)
			.returningAll()
			.executeTakeFirstOrThrow();

		await trx
			.deleteFrom("TournamentOrganizationMember")
			.where("organizationId", "=", id)
			.execute();

		await trx
			.insertInto("TournamentOrganizationMember")
			.values(
				members.map((member) => ({
					organizationId: id,
					...member,
				})),
			)
			.execute();

		await trx
			.deleteFrom("TournamentOrganizationSeries")
			.where("organizationId", "=", id)
			.execute();

		if (series.length > 0) {
			await trx
				.insertInto("TournamentOrganizationSeries")
				.values(
					series.map((s) => ({
						organizationId: id,
						name: s.name,
						description: s.description,
						substringMatches: JSON.stringify([s.name.toLowerCase()]),
						showLeaderboard: Number(s.showLeaderboard),
					})),
				)
				.execute();
		}

		await trx
			.deleteFrom("TournamentOrganizationBadge")
			.where("TournamentOrganizationBadge.organizationId", "=", id)
			.execute();

		if (badges.length > 0) {
			await trx
				.insertInto("TournamentOrganizationBadge")
				.values(
					badges.map((badgeId) => ({
						organizationId: id,
						badgeId,
					})),
				)
				.execute();
		}

		return updatedOrg;
	});
}

/**
 * Inserts a user to the banned list for a tournament organization or updates the existing entry if already exists.
 */
export function upsertBannedUser(
	args: Omit<TablesInsertable["TournamentOrganizationBannedUser"], "updatedAt">,
) {
	return db
		.insertInto("TournamentOrganizationBannedUser")
		.values({ ...args, updatedAt: databaseTimestampNow() })
		.execute();
}

/**
 * Removes a user from the banned list for a tournament organization
 */
export function unbanUser({
	organizationId,
	userId,
}: {
	organizationId: number;
	userId: number;
}) {
	return db
		.deleteFrom("TournamentOrganizationBannedUser")
		.where("organizationId", "=", organizationId)
		.where("userId", "=", userId)
		.execute();
}

/**
 * Returns all banned users for a specific tournament organization
 */
export function allBannedUsersByOrganizationId(organizationId: number) {
	return db
		.selectFrom("TournamentOrganizationBannedUser")
		.innerJoin("User", "User.id", "TournamentOrganizationBannedUser.userId")
		.select([
			"TournamentOrganizationBannedUser.privateNote",
			"TournamentOrganizationBannedUser.updatedAt",
			"TournamentOrganizationBannedUser.expiresAt",
			...COMMON_USER_FIELDS,
		])
		.where(
			"TournamentOrganizationBannedUser.organizationId",
			"=",
			organizationId,
		)
		.orderBy("TournamentOrganizationBannedUser.updatedAt", "desc")
		.execute();
}

/**
 * Checks if a user is banned by a specific organization
 */
export async function isUserBannedByOrganization({
	organizationId,
	userId,
}: {
	organizationId: number;
	userId: number;
}) {
	const result = await db
		.selectFrom("TournamentOrganizationBannedUser")
		.select(["userId", "expiresAt"])
		.where("organizationId", "=", organizationId)
		.where("userId", "=", userId)
		.executeTakeFirst();

	if (!result) return false;

	if (!result.expiresAt) return true;

	return isFuture(databaseTimestampToDate(result.expiresAt));
}

/**
 * Returns the number of organizations a user is a member of.
 */
export async function countOrganizationsByUserId(userId: number) {
	const result = await db
		.selectFrom("TournamentOrganizationMember")
		.select((eb) => eb.fn.count("organizationId").as("count"))
		.where("userId", "=", userId)
		.executeTakeFirstOrThrow();

	return Number(result.count);
}

/**
 * Updates the isEstablished status for a tournament organization.
 */
export function updateIsEstablished(
	organizationId: number,
	isEstablished: boolean,
) {
	return db
		.updateTable("TournamentOrganization")
		.set({ isEstablished: Number(isEstablished) })
		.where("id", "=", organizationId)
		.execute();
}