import { Injectable, NotFoundException } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository, Not } from 'typeorm';
import { Tenant } from '../entities/tenant.entity';
import { CreateTenantDto, UpdateTenantDto } from './dto/tenant.dto';

// 预设色板（避开红绿盲敏感色，保证差异度）
const COLOR_PALETTE = [
  '#ff7875', '#ffa940', '#ffc53d', '#73d13d', '#36cfc9',
  '#40a9ff', '#597ef7', '#9254de', '#f759ab', '#8c8c8c',
];

@Injectable()
export class TenantsService {
  constructor(@InjectRepository(Tenant) private repo: Repository<Tenant>) {}

  async findAll(query?: { includeArchived?: boolean }) {
    const where: any = {};
    if (!query?.includeArchived) where.status = Not('archived');
    return this.repo.find({ where, order: { createdAt: 'DESC' } });
  }

  async findOne(id: number) {
    const tenant = await this.repo.findOne({ where: { id } });
    if (!tenant) throw new NotFoundException('租赁方不存在');
    return tenant;
  }

  async create(dto: CreateTenantDto) {
    // 颜色未指定则自动分配（按当前租赁方数量取模）
    let color = dto.color;
    if (!color) {
      const total = await this.repo.count();
      color = COLOR_PALETTE[total % COLOR_PALETTE.length];
    }
    return this.repo.save(this.repo.create({ ...dto, color }));
  }

  async update(id: number, dto: UpdateTenantDto) {
    await this.findOne(id);
    await this.repo.update(id, dto);
    return this.repo.findOne({ where: { id } });
  }

  async remove(id: number) {
    await this.findOne(id);
    await this.repo.update(id, { status: 'archived' });
    return { message: '已归档' };
  }
}