import { Injectable, UnauthorizedException } from '@nestjs/common';
import { JwtService } from '@nestjs/jwt';
import * as bcrypt from 'bcrypt';
import { PrismaService } from '../prisma/prisma.service';
import { displayName, normalizeMobile } from '../common/mobile.util';
import { LoginDto } from './dto/login.dto';

@Injectable()
export class AuthService {
  constructor(
    private readonly prisma: PrismaService,
    private readonly jwt: JwtService,
  ) {}

  async login(dto: LoginDto) {
    const mobile = normalizeMobile(dto.mobile);
    if (!mobile) {
      throw new UnauthorizedException('موبایل یا رمز عبور نادرست است');
    }

    const user = await this.prisma.user.findUnique({
      where: { mobile },
    });

    if (!user || !user.isActive) {
      throw new UnauthorizedException('موبایل یا رمز عبور نادرست است');
    }

    const ok = await bcrypt.compare(dto.password, user.passwordHash);
    if (!ok) {
      throw new UnauthorizedException('موبایل یا رمز عبور نادرست است');
    }

    const name = displayName(user.firstName, user.lastName);
    const payload = {
      sub: user.id,
      mobile: user.mobile,
      role: user.role,
    };

    return {
      accessToken: await this.jwt.signAsync(payload),
      user: {
        id: user.id,
        mobile: user.mobile,
        firstName: user.firstName,
        lastName: user.lastName,
        name,
        role: user.role,
      },
    };
  }

  async me(userId: string) {
    const user = await this.prisma.user.findUnique({
      where: { id: userId },
      select: {
        id: true,
        mobile: true,
        firstName: true,
        lastName: true,
        email: true,
        role: true,
        isActive: true,
        createdAt: true,
      },
    });

    if (!user || !user.isActive) {
      throw new UnauthorizedException();
    }

    return {
      ...user,
      name: displayName(user.firstName, user.lastName),
    };
  }
}