import { BackendVariables } from "@Common/config/variables/Variables";
import { Customers, Prisma } from "@prisma/client";
import CustomersRepository from "@Repositories/CustomersRepository";
import TotpCodesRepository from "@Repositories/TotpCodesRepository";
import BaseService from "@Services/BaseService";
import AuthService from "@Services/common/AuthService/AuthService";
import TotpCodes, { TotpCodesReasons } from "le-coffre-resources/dist/Customer/TotpCodes";
import { Customer } from "le-coffre-resources/dist/Notary";
import { Service } from "typedi";
import OvhService from "@Services/common/OvhService/OvhService";

export class SmsNotExpiredError extends Error {
	constructor() {
		super("SMS code not expired");
	}
}

export class TotpCodeExpiredError extends Error {
	constructor() {
		super("Totp code not found or expired");
	}
}

export class InvalidTotpCodeError extends Error {
	constructor() {
		super("Invalid Totp code");
	}
}

export class NotRegisteredCustomerError extends Error {
	constructor() {
		super("Customer not registered");
	}
}

export class InvalidPasswordError extends Error {
	constructor() {
		super("Invalid password");
	}
}

export class PasswordAlreadySetError extends Error {
	constructor() {
		super("Password already set");
	}
}

export class TooSoonForNewCode extends Error {
	constructor() {
		super("You need to wait at least 30 seconds before asking for a new code");
	}
}
@Service()
export default class CustomersService extends BaseService {
	constructor(
		private customerRepository: CustomersRepository,
		private authService: AuthService,
		private totpCodesRepository: TotpCodesRepository,
		private variables: BackendVariables,
		private ovhService: OvhService,
	) {
		super();
	}

	/**
	 * @description : Get all Customers
	 * @throws {Error} If Customers cannot be get
	 */
	public async get(query: Prisma.CustomersFindManyArgs): Promise<Customers[]> {
		return this.customerRepository.findMany(query);
	}

	/**
	 * @description : Get all Customers
	 * @throws {Error} If Customers cannot be get
	 */
	public async getOne(query: Prisma.CustomersFindFirstArgs): Promise<Customers | null> {
		return this.customerRepository.findOne(query);
	}

	/**
	 * @description : Send SMS to verify the email of a customer (2FA)
	 * 1: Check if the customer exists
	 * 2: Check in the array of totpCodes if one is still valid
	 * 3: Generate a new SMS code
	 * 4: Save the SMS code in database
	 * 5: Send the SMS code to the customer
	 */
	public async verifyEmail2FASms(email: string): Promise<Customer | null> {
		// 1: Check if the customer exists
		const customer = await this.getByEmail(email);
		if (!customer) return null;
		const now = new Date().getTime();

		const customerHydrated = Customer.hydrate<Customer>(customer);

		// 2: Check in the array of totpCodes if one is still valid
		const validTotpCode = customerHydrated.totpCodes?.find((totpCode) => {
			return totpCode.expire_at && totpCode.expire_at.getTime() > now;
		});
		if (validTotpCode) throw new SmsNotExpiredError();

		// 3: Generate a new SMS code
		const totpPin = this.generateTotp();

		const reason = customer.password ? TotpCodesReasons.LOGIN : TotpCodesReasons.FIRST_LOGIN;
		// 4: Save the SMS code in database
		await this.saveTotpPin(customer, totpPin, new Date(now + 5 * 60000), reason);

		// 5: Send the SMS code to the customer
		await this.sendSmsCodeToCustomer(totpPin, customer);
		return customer;
	}

	/**
	 * @description : Send SMS to verify the email of a customer (2FA)
	 * 1: Check if the customer exists
	 * 2: Check in the array of totpCodes if one is still valid
	 * 3: Generate a new SMS code
	 * 4: Save the SMS code in database
	 * 5: Send the SMS code to the customer
	 */
	public async generateCodeForNewPassword(email: string): Promise<Customer | null> {
		// 1: Check if the customer exists
		const customer = await this.getByEmail(email);
		if (!customer) return null;
		const now = new Date().getTime();

		const customerHydrated = Customer.hydrate<Customer>(customer);

		// 2: Check in the array of totpCodes if one is still valid
		const validTotpCode = customerHydrated.totpCodes?.find((totpCode) => {
			return totpCode.expire_at && totpCode.expire_at.getTime() > now && totpCode.reason === TotpCodesReasons.RESET_PASSWORD;
		});
		if (validTotpCode) throw new SmsNotExpiredError();

		// 3: Archive all active totp codes for this customer
		const activeTotpCodes = customerHydrated.totpCodes?.filter((totpCode) => {
			return totpCode.expire_at && totpCode.expire_at.getTime() > now;
		});

		if (activeTotpCodes) {
			await Promise.all(
				activeTotpCodes.map(async (totpCode) => {
					await this.totpCodesRepository.disable(totpCode);
				}),
			);
		}

		// 3: Generate a new SMS code
		const totpPin = this.generateTotp();

		// 4: Save the SMS code in database
		await this.saveTotpPin(customer, totpPin, new Date(now + 5 * 60000), TotpCodesReasons.RESET_PASSWORD);

		// 5: Send the SMS code to the customer
		await this.sendSmsCodeToCustomer(totpPin, customer);
		return customer;
	}

	/**
	 * @description : Set the password of a customer when it's the first time they connect
	 * 1: Check if the customer exists
	 * 2: Check if a totp code is existing and is not expired in the array
	 * 3: Check if the SMS code is valid
	 * 4: Check the totpcode reason is valid
	 * 5: Disable the totp code used
	 * 6: Hash the password
	 * 7: Set the password in database and return the result of the update
	 * @param email
	 * @param totpCode
	 * @param password
	 * @returns
	 */
	public async setFirstPassword(email: string, totpCode: string, password: string): Promise<Customer | null> {
		// 1: Check if the customer exists
		const customer = await this.getByEmail(email);
		if (!customer) return null;

		const customerHydrated = Customer.hydrate<Customer>(customer);
		// 2: Check if a totp code is existing and is not expired in the array
		const validTotpCode = customerHydrated.totpCodes?.find((totpCode) => {
			return totpCode.expire_at && new Date().getTime() < totpCode.expire_at.getTime();
		});

		if (!validTotpCode) throw new TotpCodeExpiredError();

		// 3: Check if the SMS code is valid
		if (validTotpCode.code !== totpCode) throw new InvalidTotpCodeError();

		// 4: Check the totpcode reason is valid
		// If the customer already has a password, the reason must be RESET_PASSWORD
		// If the customer doesn't have a password, the reason must be FIRST_LOGIN
		if (
			(customer.password && validTotpCode.reason !== TotpCodesReasons.RESET_PASSWORD) ||
			(!customer.password && validTotpCode.reason !== TotpCodesReasons.FIRST_LOGIN)
		)
			throw new InvalidTotpCodeError();

		// 5: Disable the totp code used
		await this.totpCodesRepository.disable(validTotpCode);

		// 6: Hash the password
		const hashedPassword = await this.authService.hashPassword(password);

		// 7: Set the password in database and return the result of the update
		return await this.setPassword(customer, hashedPassword);
	}

	/**
	 *
	 * @description : Login a customer
	 * 1: Check if the customer exists
	 * 2: Check if a totp code is existing and is not expired in the array
	 * 3: Check if the SMS code is valid
	 * 4: Check if the user has a password or it's their first login
	 * 5: Check if the password is valid
	 * 6: Disable the totp code used
	 * 7: Return the customer
	 * @param email
	 * @param totpCode
	 * @param password
	 * @returns Customer | null
	 */
	public async login(email: string, totpCode: string, password: string): Promise<Customer | null> {
		// 1: Check if the customer exists
		const customer = await this.getByEmail(email);
		if (!customer) return null;
		const customerHydrated = Customer.hydrate<Customer>(customer);

		// 2: Check if a totp code is existing and is not expired in the array
		const validTotpCode = customerHydrated.totpCodes?.find((totpCode) => {
			return totpCode.expire_at && new Date().getTime() < totpCode.expire_at.getTime() && totpCode.reason === TotpCodesReasons.LOGIN;
		});
		if (!validTotpCode) throw new TotpCodeExpiredError();

		// 3: Check if the SMS code is valid
		if (validTotpCode.code !== totpCode) throw new InvalidTotpCodeError();

		// 4: Check if the user has a password or it's their first login
		if (!customer.password) throw new NotRegisteredCustomerError();

		// 5: Check if the password is valid
		const isPasswordValid = await this.authService.comparePassword(password, customer.password);
		if (!isPasswordValid) throw new InvalidPasswordError();

		// 6: Disable the totp code used
		await this.totpCodesRepository.disable(validTotpCode);

		// 7: Return the customer
		return await this.customerRepository.update(
			customer.uid as string,
			Customer.hydrate<Customer>({
				...customer,
			}),
		);
	}

	public async askAnotherCode(email: string): Promise<Customer | null> {
		// 1: Check if the customer exists
		const customer = await this.getByEmail(email);
		if (!customer) return null;
		const now = new Date().getTime();

		const customerHydrated = Customer.hydrate<Customer>(customer);

		// 2: Get last code sent
		const lastCode = customerHydrated.totpCodes?.find((totpCode) => {
			return totpCode.expire_at && totpCode.expire_at.getTime() > now;
		});
		if (!lastCode) throw new TotpCodeExpiredError();

		// 3: Check if it was created more than 30 seconds ago
		if (lastCode.created_at && lastCode.created_at.getTime() > now - 30000) throw new TooSoonForNewCode();

		// 4: Generate a new SMS code
		const totpPin = this.generateTotp();

		// 5: Disable the old code
		await this.totpCodesRepository.disable(lastCode);

		// 6: Save the SMS code in database
		await this.saveTotpPin(customer, totpPin, new Date(now + 5 * 60000), lastCode.reason!);

		// 7: Send the SMS code to the customer
		await this.sendSmsCodeToCustomer(totpPin, customer);
		return customer;
	}

	/**
	 * @description : Set password for a customer
	 * @throws {Error} If customer cannot be updated
	 */
	private async setPassword(customer: Customer, password: string) {
		return await this.customerRepository.update(
			customer.uid as string,
			Customer.hydrate<Customer>({
				...customer,
			}),
			{
				password,
			},
		);
	}

	private getByEmail(email: string) {
		return this.customerRepository.findOne({
			where: {
				contact: {
					email,
				},
			},
			include: {
				contact: true,
				totpCodes: true,
			},
		});
	}

	/**
	 * @description : Saves a TotpPin in database
	 */
	private async saveTotpPin(customer: Customer, totpPin: number, expireAt: Date, reason: TotpCodesReasons) {
		// Create the totpCode in table using repository
		await this.totpCodesRepository.create(
			TotpCodes.hydrate<TotpCodes>({
				reason,
				customer_uid: customer.uid,
				customer: Customer.hydrate<Customer>(customer),
				created_at: new Date(),
				code: totpPin.toString(),
				expire_at: expireAt,
			}),
		);
		return await this.customerRepository.update(
			customer.uid as string,
			Customer.hydrate<Customer>({
				...customer,
			}),
		);
	}

	private generateTotp() {
		return Math.floor(100000 + Math.random() * 900000);
	}

	private async sendSmsCodeToCustomer(totpPin: number, customer: Customer) {
		try {
			// Sélectionnez le fournisseur de SMS en fonction de la variable d'environnement
			const selectedProvider = this.variables.SMS_PROVIDER === 'OVH' ? this.ovhService : this.ovhService;

			// Envoi du SMS
			if(!customer.contact?.phone_number) return false;
			let success = await selectedProvider.sendSms(customer.contact?.phone_number, totpPin.toString());

			// Si l'envoi échoue, basculez automatiquement sur le second fournisseur
			// if (!success) {
			// 	const alternateProvider = this.variables.SMS_PROVIDER === 'OVH' ? this.smsService2 : this.ovhService;
			// 	success = await alternateProvider.sendSms(customer.contact?.phone_number, totpPin);
			// }

			return success;

		} catch (error) {
			console.error(`Erreur lors de l'envoi du SMS : ${error}`);
      		return false;
		}
	}

	/**
	 *
	 * 1: Check if the customer exists
	 * 2: Check if a totp code is existing and is not expired in the array
	 * 3: Check if the totp code is valid
	 * 4: Return the customer
	 * @param totpCode
	 * @param email
	 * @returns
	 */
	public async verifyTotpCode(totpCode: string, email: string): Promise<TotpCodes | null> {
		// 1: Check if the customer exists
		const customer = await this.getByEmail(email);
		if (!customer) return null;

		const customerHydrated = Customer.hydrate<Customer>(customer);

		// 2: Check if a totp code is existing and is not expired in the array
		const validTotpCode = customerHydrated.totpCodes?.find((totpCode) => {
			return totpCode.expire_at && new Date().getTime() < totpCode.expire_at.getTime();
		});
		if (!validTotpCode) throw new TotpCodeExpiredError();

		// 3: Check if the SMS code is valid
		if (validTotpCode.code !== totpCode) throw new InvalidTotpCodeError();

		// 4: Return the customer
		return validTotpCode;
	}
}