import { ForbiddenException, Injectable, NotFoundException } from "@nestjs/common";
import { InjectRepository } from "@nestjs/typeorm";
import { RoleType, StatutUtilisateurType, Users } from "src/entities/users.entity";
import { Repository } from "typeorm";
import { CreateUserDto } from "./dto/create_user.dto";
import { UpdateUserDto } from "./dto/update_user.dto";
import * as bcrypt from 'bcrypt';
import { StatutValidationType, Validation } from "src/entities/validations.entity";

@Injectable()
export class UserService {
    constructor(
        @InjectRepository(Users)
        private readonly usersRepository: Repository<Users>,

        @InjectRepository(Validation)
        private readonly validationRepository: Repository<Validation>
    ) { }

    // Création utilisateur
    async createUser(dto: CreateUserDto, currentUser?: Users): Promise<Users> {
        // Sécuriser le rôle
        if (!currentUser || currentUser.role !== RoleType.SUPER_ADMIN) {
            dto.role = RoleType.PARENT;
        }

        // Nettoyage / validation consentement photo
        let consentDate: Date | undefined;
        if (dto.consentement_photo && dto.date_consentement_photo) {
            const parsed = new Date(dto.date_consentement_photo);
            if (!isNaN(parsed.getTime())) {
                consentDate = parsed;
            }
        }

        // Hash mot de passe
        const salt = await bcrypt.genSalt();
        const hashedPassword = await bcrypt.hash(dto.password, salt);

        const entity = this.usersRepository.create({
            email: dto.email,
            password: hashedPassword,
            prenom: dto.prenom,
            nom: dto.nom,
            role: dto.role,
            statut: dto.statut,
            genre: dto.genre,
            telephone: dto.telephone,
            ville: dto.ville,
            code_postal: dto.code_postal,
            adresse: dto.adresse,
            photo_url: dto.photo_url,
            consentement_photo: dto.consentement_photo ?? false,
            date_consentement_photo: consentDate,
            changement_mdp_obligatoire: dto.changement_mdp_obligatoire ?? false
        });

        const saved = await this.usersRepository.save(entity);
        return this.findOne(saved.id);
    }

    async findAll(): Promise<Users[]> {
        return this.usersRepository.find();
    }

    async findOneBy(where: Partial<Users>): Promise<Users | null> {
        return this.usersRepository.findOne({ where });
    }

    async findOne(id: string): Promise<Users> {
        const user = await this.usersRepository.findOne({ where: { id } });
        if (!user) {
            throw new NotFoundException('Utilisateur introuvable');
        }
        return user;
    }

    async findByEmailOrNull(email: string): Promise<Users | null> {
        return this.usersRepository.findOne({ where: { email } });
    }

    async updateUser(id: string, dto: UpdateUserDto, currentUser: Users): Promise<Users> {
        const user = await this.findOne(id);

        // Interdire changement de rôle si pas super admin
        if (dto.role && currentUser.role !== RoleType.SUPER_ADMIN) {
            throw new ForbiddenException('Accès réservé aux super admins');
        }

        // Gestion du mot de passe
        if (dto.password) {
            const salt = await bcrypt.genSalt();
            user.password = await bcrypt.hash(dto.password, salt);
            delete (dto as any).password;
        }

        // Conversion de la date de consentement
        if (dto.date_consentement_photo !== undefined) {
            user.date_consentement_photo = dto.date_consentement_photo
                ? new Date(dto.date_consentement_photo)
                : undefined;
            delete (dto as any).date_consentement_photo;
        }

        Object.assign(user, dto);
        return this.usersRepository.save(user);
    }

    async validateUser(user_id: string, currentUser: Users, comment?: string): Promise<Users> {
        if (![RoleType.SUPER_ADMIN, RoleType.ADMINISTRATEUR, RoleType.GESTIONNAIRE].includes(currentUser.role)) {
            throw new ForbiddenException('Accès réservé aux super admins, administrateurs et gestionnaires');
        }

        const user = await this.usersRepository.findOne({ where: { id: user_id } });
        if (!user) throw new NotFoundException('Utilisateur introuvable');
        user.statut = StatutUtilisateurType.ACTIF;
        const savedUser = await this.usersRepository.save(user);

        const validation = this.validationRepository.create({
            user: savedUser,
            type: 'validation_compte',
            status: StatutValidationType.VALIDE,
            validated_by: currentUser,
            comment
            
        });
        await this.validationRepository.save(validation);
        return savedUser;
    }

    async remove(id: string): Promise<void> {
        const result = await this.usersRepository.delete(id);
        if (result.affected === 0) {
            throw new NotFoundException('Utilisateur introuvable');
        }
    }
}