import bcrypt from 'bcrypt';
import { Injectable, NotFoundException } from '@nestjs/common';
import { plainToInstance } from 'class-transformer';

import { Prisma, Usuario } from 'generated/prisma';

import { PrismaService } from '@prisma/prisma.service';
import { PaginatedResponse } from '@shared/dto/paginated';
import { UsuariosResponseDto } from './dto/usuarios.response';
import { CreateUsuarioDto } from './dto/create-usuario-dto';

type ListUsuariosFilters = {
  name?: string;
  email?: string;
};

type ListUsuariosPaginatedParams = ListUsuariosFilters & {
  page?: number;
  perPage?: number;
  direction?: 'asc' | 'desc';
};

const SELECT = {
  id: true,
  uuid: true,
  email: true,
  email_verificado: true,
  nome: true,
  sobrenome: true,
  papel: true,
  status: true,
  ultimo_login_em: true,
  ultimo_login_ip: true,
  tentativas_login_falhadas: true,
  bloqueado_ate: true,
  criado_em: true,
  atualizado_em: true,
} as const;

@Injectable()
export class UsuariosService {
  constructor(private readonly prisma: PrismaService) {}

  private buildWhere({
    name,
    email,
  }: ListUsuariosFilters): Prisma.UsuarioWhereInput {
    const andConditions: Prisma.UsuarioWhereInput[] = [
      { email: { not: 'admin@clipperia.com' } },
    ];

    if (name) {
      andConditions.push({
        OR: [
          { nome: { contains: name, mode: 'insensitive' } },
          { sobrenome: { contains: name, mode: 'insensitive' } },
        ],
      });
    }

    if (email) {
      andConditions.push({ email: { contains: email, mode: 'insensitive' } });
    }

    return { AND: andConditions };
  }

  async list(
    filters: ListUsuariosFilters = {},
  ): Promise<UsuariosResponseDto[]> {
    const where = this.buildWhere(filters);

    const data = await this.prisma.usuario.findMany({
      where,
      orderBy: { id: 'desc' },
      select: SELECT,
    });

    return plainToInstance(UsuariosResponseDto, data, {
      excludeExtraneousValues: true,
    });
  }

  async listPaginated(
    params: ListUsuariosPaginatedParams,
  ): Promise<PaginatedResponse<UsuariosResponseDto>> {
    const parsedPage = Number(params.page);
    const safePage =
      Number.isFinite(parsedPage) && parsedPage > 0
        ? Math.floor(parsedPage)
        : 1;

    const parsedPerPage = Number(params.perPage);
    const safePerPage =
      Number.isFinite(parsedPerPage) && parsedPerPage > 0
        ? Math.floor(parsedPerPage)
        : 10;

    const safeDirection: 'asc' | 'desc' =
      params.direction === 'asc' ? 'asc' : 'desc';

    const where = this.buildWhere(params);
    const skip = (safePage - 1) * safePerPage;

    const [rows, total] = await Promise.all([
      this.prisma.usuario.findMany({
        where,
        orderBy: { id: safeDirection },
        skip,
        take: safePerPage,
        select: SELECT,
      }),
      this.prisma.usuario.count({ where }),
    ]);

    const content: UsuariosResponseDto[] = plainToInstance(
      UsuariosResponseDto,
      rows,
      { excludeExtraneousValues: true },
    );

    const totalPages = Math.max(1, Math.ceil(total / safePerPage));

    return {
      content,
      pagination: {
        page: safePage,
        direction: safeDirection,
        perPage: safePerPage,
        total,
        totalPages,
        hasNext: safePage < totalPages,
        hasPrev: safePage > 1,
      },
    };
  }

  async get(uuid: string): Promise<UsuariosResponseDto> {
    const row = await this.prisma.usuario.findUnique({
      where: { uuid },
      select: SELECT,
    });

    if (!row) {
      throw new NotFoundException('Usuário não encontrado');
    }

    return plainToInstance(UsuariosResponseDto, row, {
      excludeExtraneousValues: true,
    });
  }

  async update(id: number, data: Prisma.UsuarioUpdateInput): Promise<Usuario> {
    return this.prisma.usuario.update({
      where: { id },
      data,
    });
  }

  async create(dto: CreateUsuarioDto): Promise<UsuariosResponseDto> {
    const { email, password, nome, sobrenome } = dto;

    const senhaCriptografada = await bcrypt.hash(password, 10);

    const usuario = await this.prisma.usuario.create({
      data: {
        email,
        password: senhaCriptografada,
        nome,
        sobrenome,
      },
    });

    return plainToInstance(UsuariosResponseDto, usuario, {
      excludeExtraneousValues: true,
    });
  }

  async delete(id: number): Promise<Usuario> {
    return this.prisma.usuario.delete({
      where: { id },
    });
  }

  async emailVerificado(uuid: string): Promise<UsuariosResponseDto> {
    const usuario = await this.prisma.usuario.update({
      where: { uuid },
      data: { email_verificado: 'V' },
    });

    return plainToInstance(UsuariosResponseDto, usuario, {
      excludeExtraneousValues: true,
    });
  }
}