import {
    ConflictException,
    Injectable,
    UnauthorizedException,
} from '@nestjs/common';
import { UserService } from '../user/user.service';
import { JwtService } from '@nestjs/jwt';
import * as bcrypt from 'bcrypt';
import { RegisterDto } from './dto/register.dto';
import { ConfigService } from '@nestjs/config';
import { RoleType, StatutUtilisateurType, Users } from 'src/entities/users.entity';
import { LoginDto } from './dto/login.dto';
import { DeepPartial } from 'typeorm';

@Injectable()
export class AuthService {
    constructor(
        private readonly usersService: UserService,
        private readonly jwtService: JwtService,
        private readonly configService: ConfigService,
    ) { }

    /**
     * Génère un access_token et un refresh_token
     */
    async generateTokens(userId: string, email: string, role: RoleType) {
        const accessSecret = this.configService.get<string>('jwt.accessSecret');
        const accessExpiresIn = this.configService.get<string>('jwt.accessExpiresIn');
        const refreshSecret = this.configService.get<string>('jwt.refreshSecret');
        const refreshExpiresIn = this.configService.get<string>('jwt.refreshExpiresIn');

        const [accessToken, refreshToken] = await Promise.all([
            this.jwtService.signAsync({ sub: userId, email, role }, { secret: accessSecret, expiresIn: accessExpiresIn }),
            this.jwtService.signAsync({ sub: userId }, { secret: refreshSecret, expiresIn: refreshExpiresIn }),
        ]);

        return {
            access_token: accessToken,
            refresh_token: refreshToken,
        };
    }

    /**
     * Connexion utilisateur
     */
    async login(dto: LoginDto) {
        try {
            const user = await this.usersService.findByEmailOrNull(dto.email);

            if (!user) {
                throw new UnauthorizedException('Email invalide');
            }
            console.log("Tentative login:", dto.email, JSON.stringify(dto.password));
            console.log("Utilisateur trouvé:", user.email, user.password);

            const isMatch = await bcrypt.compare(dto.password, user.password);
            console.log("Résultat bcrypt.compare:", isMatch);
            if (!isMatch) {
                throw new UnauthorizedException('Mot de passe invalide');
            }
            // if (user.password !== dto.password) {
            //     throw new UnauthorizedException('Mot de passe invalide');
            // }

            return this.generateTokens(user.id, user.email, user.role);
        } catch (error) {
            console.error('Erreur de connexion :', error);
            throw new UnauthorizedException('Identifiants invalides');
        }
    }

    /**
     * Rafraîchir les tokens
     */
    async refreshTokens(refreshToken: string) {
        try {
            const payload = await this.jwtService.verifyAsync(refreshToken, {
                secret: this.configService.get<string>('jwt.refreshSecret'),
            });

            const user = await this.usersService.findOne(payload.sub);
            if (!user) {
                throw new UnauthorizedException('Utilisateur introuvable');
            }

            return this.generateTokens(user.id, user.email, user.role);
        } catch {
            throw new UnauthorizedException('Refresh token invalide');
        }
    }

    /**
     * Inscription utilisateur lambda (parent ou assistante maternelle)
     */
    async register(registerDto: RegisterDto) {
        const exists = await this.usersService.findByEmailOrNull(registerDto.email);
        if (exists) {
            throw new ConflictException('Email déjà utilisé');
        }

        const allowedRoles = new Set<RoleType>([RoleType.PARENT, RoleType.ASSISTANTE_MATERNELLE]);
        if (!allowedRoles.has(registerDto.role)) {
            registerDto.role = RoleType.PARENT;
        }

        registerDto.statut = StatutUtilisateurType.EN_ATTENTE;

        if (!registerDto.consentement_photo) {
            registerDto.date_consentement_photo = null;
        } else if (registerDto.date_consentement_photo) {
            const date = new Date(registerDto.date_consentement_photo);
            if (isNaN(date.getTime())) {
                registerDto.date_consentement_photo = null;
            }
        }

        const user = await this.usersService.createUser(registerDto);
        const tokens = await this.generateTokens(user.id, user.email, user.role);

        return {
            ...tokens,
            user: {
                id: user.id,
                email: user.email,
                role: user.role,
                prenom: user.prenom,
                nom: user.nom,
                statut: user.statut,
            },
        };
    }

    async logout(userId: string) {
        // Pour une implémentation simple, on ne fait rien ici.
    }
}