import { Inject, Injectable } from '@nestjs/common';
import bcrypt from 'bcryptjs';
import { IsNull } from 'typeorm';
import { DI } from '@/di-symbols.js';
import type { RegistrationTicketsRepository, UsedUsernamesRepository, UserPendingsRepository, UserProfilesRepository, UsersRepository } from '@/models/index.js';
import type { Config } from '@/config.js';
import { MetaService } from '@/core/MetaService.js';
import { CaptchaService } from '@/core/CaptchaService.js';
import { IdService } from '@/core/IdService.js';
import { SignupService } from '@/core/SignupService.js';
import { UserEntityService } from '@/core/entities/UserEntityService.js';
import { EmailService } from '@/core/EmailService.js';
import { LocalUser } from '@/models/entities/User.js';
import { FastifyReplyError } from '@/misc/fastify-reply-error.js';
import { bindThis } from '@/decorators.js';
import { SigninService } from './SigninService.js';
import type { FastifyRequest, FastifyReply } from 'fastify';
import { L_CHARS, secureRndstr } from '@/misc/secure-rndstr.js';

@Injectable()
export class SignupApiService {
	constructor(
		@Inject(DI.config)
		private config: Config,

		@Inject(DI.usersRepository)
		private usersRepository: UsersRepository,

		@Inject(DI.userProfilesRepository)
		private userProfilesRepository: UserProfilesRepository,

		@Inject(DI.userPendingsRepository)
		private userPendingsRepository: UserPendingsRepository,

		@Inject(DI.usedUsernamesRepository)
		private usedUsernamesRepository: UsedUsernamesRepository,

		@Inject(DI.registrationTicketsRepository)
		private registrationTicketsRepository: RegistrationTicketsRepository,

		private userEntityService: UserEntityService,
		private idService: IdService,
		private metaService: MetaService,
		private captchaService: CaptchaService,
		private signupService: SignupService,
		private signinService: SigninService,
		private emailService: EmailService,
	) {
	}

	@bindThis
	public async signup(
		request: FastifyRequest<{
			Body: {
				username: string;
				password: string;
				host?: string;
				invitationCode?: string;
				emailAddress?: string;
				'hcaptcha-response'?: string;
				'g-recaptcha-response'?: string;
				'turnstile-response'?: string;
			}
		}>,
		reply: FastifyReply,
	) {
		const body = request.body;

		const instance = await this.metaService.fetch(true);

		// Verify *Captcha
		// ただしテスト時はこの機構は障害となるため無効にする
		if (process.env.NODE_ENV !== 'test') {
			if (instance.enableHcaptcha && instance.hcaptchaSecretKey) {
				await this.captchaService.verifyHcaptcha(instance.hcaptchaSecretKey, body['hcaptcha-response']).catch(err => {
					throw new FastifyReplyError(400, err);
				});
			}

			if (instance.enableRecaptcha && instance.recaptchaSecretKey) {
				await this.captchaService.verifyRecaptcha(instance.recaptchaSecretKey, body['g-recaptcha-response']).catch(err => {
					throw new FastifyReplyError(400, err);
				});
			}

			if (instance.enableTurnstile && instance.turnstileSecretKey) {
				await this.captchaService.verifyTurnstile(instance.turnstileSecretKey, body['turnstile-response']).catch(err => {
					throw new FastifyReplyError(400, err);
				});
			}
		}

		const username = body['username'];
		const password = body['password'];
		const host: string | null = process.env.NODE_ENV === 'test' ? (body['host'] ?? null) : null;
		const invitationCode = body['invitationCode'];
		const emailAddress = body['emailAddress'];

		if (instance.emailRequiredForSignup) {
			if (emailAddress == null || typeof emailAddress !== 'string') {
				reply.code(400);
				return;
			}

			const res = await this.emailService.validateEmailForAccount(emailAddress);
			if (!res.available) {
				reply.code(400);
				return;
			}
		}

		if (instance.disableRegistration) {
			if (invitationCode == null || typeof invitationCode !== 'string') {
				reply.code(400);
				return;
			}

			const ticket = await this.registrationTicketsRepository.findOneBy({
				code: invitationCode,
			});

			if (ticket == null) {
				reply.code(400);
				return;
			}

			this.registrationTicketsRepository.delete(ticket.id);
		}

		if (instance.emailRequiredForSignup) {
			if (await this.usersRepository.findOneBy({ usernameLower: username.toLowerCase(), host: IsNull() })) {
				throw new FastifyReplyError(400, 'DUPLICATED_USERNAME');
			}

			// Check deleted username duplication
			if (await this.usedUsernamesRepository.findOneBy({ username: username.toLowerCase() })) {
				throw new FastifyReplyError(400, 'USED_USERNAME');
			}

			const isPreserved = instance.preservedUsernames.map(x => x.toLowerCase()).includes(username.toLowerCase());
			if (isPreserved) {
				throw new FastifyReplyError(400, 'DENIED_USERNAME');
			}

			const code = secureRndstr(16, { chars: L_CHARS });

			// Generate hash of password
			const salt = await bcrypt.genSalt(8);
			const hash = await bcrypt.hash(password, salt);

			await this.userPendingsRepository.insert({
				id: this.idService.genId(),
				createdAt: new Date(),
				code,
				email: emailAddress!,
				username: username,
				password: hash,
			});

			const link = `${this.config.url}/signup-complete/${code}`;

			this.emailService.sendEmail(emailAddress!, 'Signup',
				`To complete signup, please click this link:<br><a href="${link}">${link}</a>`,
				`To complete signup, please click this link: ${link}`);

			reply.code(204);
			return;
		} else {
			try {
				const { account, secret } = await this.signupService.signup({
					username, password, host,
				});

				const res = await this.userEntityService.pack(account, account, {
					detail: true,
					includeSecrets: true,
				});

				return {
					...res,
					token: secret,
				};
			} catch (err) {
				throw new FastifyReplyError(400, typeof err === 'string' ? err : (err as Error).toString());
			}
		}
	}

	@bindThis
	public async signupPending(request: FastifyRequest<{ Body: { code: string; } }>, reply: FastifyReply) {
		const body = request.body;

		const code = body['code'];

		try {
			const pendingUser = await this.userPendingsRepository.findOneByOrFail({ code });

			const { account, secret } = await this.signupService.signup({
				username: pendingUser.username,
				passwordHash: pendingUser.password,
			});

			this.userPendingsRepository.delete({
				id: pendingUser.id,
			});

			const profile = await this.userProfilesRepository.findOneByOrFail({ userId: account.id });

			await this.userProfilesRepository.update({ userId: profile.userId }, {
				email: pendingUser.email,
				emailVerified: true,
				emailVerifyCode: null,
			});

			return this.signinService.signin(request, reply, account as LocalUser);
		} catch (err) {
			throw new FastifyReplyError(400, typeof err === 'string' ? err : (err as Error).toString());
		}
	}
}