import { ForbiddenException, Injectable, NotFoundException } from "@nestjs/common";
import { InjectRepository } from "@nestjs/typeorm";
import { RoleType, 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';

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

    // 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.consent_photo && dto.consent_photo_at) {
            const parsed = new Date(dto.consent_photo_at);
            if (!isNaN(parsed.getTime())) {
                consentDate = parsed;
            }
        }

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

        const entity = this.usersRepository.create({
            email: dto.email,
            password_hash,
            first_name: dto.first_name,
            last_name: dto.last_name,
            role: dto.role,
            status: dto.status,
            gender: dto.gender,
            phone: dto.phone,
            address: dto.address,
            photo_url: dto.photo_url,
            consent_photo: dto.consent_photo ?? false,
            consent_photo_at: consentDate,
            must_change_password: dto.must_change_password ?? false
        });

        const saved = await this.usersRepository.save(entity);
        return this.findOne(saved.id);
    }
    
    //Trouver tous les utilisateurs
    async findAll(): Promise<Users[]> {
        return this.usersRepository.find();
    }


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

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

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

    // Mettre à jour un utilisateur
    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_hash = await bcrypt.hash(dto.password, salt);
            delete (dto as any).password;
        }

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

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

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