import { Injectable } from "@nestjs/common";
import { and, eq, lte, sql } from "drizzle-orm";
import { DatabaseService } from "../../database/database.service";
import { contents, favorites, users } from "../../database/schemas";

@Injectable()
export class UsersRepository {
	constructor(private readonly databaseService: DatabaseService) {}

	async create(data: {
		username: string;
		email: string;
		passwordHash: string;
		emailHash: string;
	}) {
		const [newUser] = await this.databaseService.db
			.insert(users)
			.values(data)
			.returning();
		return newUser;
	}

	async findByEmailHash(emailHash: string) {
		const result = await this.databaseService.db
			.select({
				uuid: users.uuid,
				username: users.username,
				email: users.email,
				passwordHash: users.passwordHash,
				status: users.status,
				isTwoFactorEnabled: users.isTwoFactorEnabled,
			})
			.from(users)
			.where(eq(users.emailHash, emailHash))
			.limit(1);
		return result[0] || null;
	}

	async findOneWithPrivateData(uuid: string) {
		const result = await this.databaseService.db
			.select({
				uuid: users.uuid,
				username: users.username,
				email: users.email,
				displayName: users.displayName,
				avatarUrl: users.avatarUrl,
				bio: users.bio,
				status: users.status,
				isTwoFactorEnabled: users.isTwoFactorEnabled,
				createdAt: users.createdAt,
				updatedAt: users.updatedAt,
			})
			.from(users)
			.where(eq(users.uuid, uuid))
			.limit(1);
		return result[0] || null;
	}

	async countAll() {
		const result = await this.databaseService.db
			.select({ count: sql<number>`count(*)` })
			.from(users);
		return Number(result[0].count);
	}

	async findAll(limit: number, offset: number) {
		const result = await this.databaseService.db
			.select({
				uuid: users.uuid,
				username: users.username,
				email: users.email,
				displayName: users.displayName,
				avatarUrl: users.avatarUrl,
				status: users.status,
				createdAt: users.createdAt,
			})
			.from(users)
			.limit(limit)
			.offset(offset);

		return result;
	}

	async findByUsername(username: string) {
		const result = await this.databaseService.db
			.select({
				uuid: users.uuid,
				username: users.username,
				displayName: users.displayName,
				avatarUrl: users.avatarUrl,
				bio: users.bio,
				createdAt: users.createdAt,
			})
			.from(users)
			.where(eq(users.username, username))
			.limit(1);
		return result[0] || null;
	}

	async findOne(uuid: string) {
		const result = await this.databaseService.db
			.select()
			.from(users)
			.where(eq(users.uuid, uuid))
			.limit(1);
		return result[0] || null;
	}

	async update(uuid: string, data: Partial<typeof users.$inferInsert>) {
		return await this.databaseService.db
			.update(users)
			.set({ ...data, updatedAt: new Date() })
			.where(eq(users.uuid, uuid))
			.returning();
	}

	async getTwoFactorSecret(uuid: string) {
		const result = await this.databaseService.db
			.select({
				secret: users.twoFactorSecret,
			})
			.from(users)
			.where(eq(users.uuid, uuid))
			.limit(1);
		return result[0]?.secret || null;
	}

	async getUserContents(uuid: string) {
		return await this.databaseService.db
			.select()
			.from(contents)
			.where(eq(contents.userId, uuid));
	}

	async getUserFavorites(uuid: string) {
		return await this.databaseService.db
			.select()
			.from(favorites)
			.where(eq(favorites.userId, uuid));
	}

	async softDeleteUserAndContents(uuid: string) {
		return await this.databaseService.db.transaction(async (tx) => {
			const userResult = await tx
				.update(users)
				.set({ status: "deleted", deletedAt: new Date() })
				.where(eq(users.uuid, uuid))
				.returning();

			await tx
				.update(contents)
				.set({ deletedAt: new Date() })
				.where(eq(contents.userId, uuid));

			return userResult;
		});
	}

	async purgeDeleted(before: Date) {
		return await this.databaseService.db
			.delete(users)
			.where(and(eq(users.status, "deleted"), lte(users.deletedAt, before)))
			.returning();
	}
}