import { Injectable } from '@nestjs/common';
import { EntityManager, EntityRepository } from '@mikro-orm/postgresql';
import { FilterQuery } from '@mikro-orm/core';
import { Product } from '../entities/product.entity';
import { PaginatedResult } from 'src/common/interfaces/pagination.interface';

type FindproductsOpts = {
  page?: number;
  limit?: number;
  search?: string;
  orderBy?: string;
  order?: 'asc' | 'desc';
  categoryId?: string;
  isActive?: boolean;
};

@Injectable()
export class ProductRepository extends EntityRepository<Product> {
  constructor(readonly em: EntityManager) {
    super(em, Product);
  }

  async findAllPaginated(opts: FindproductsOpts = {}): Promise<PaginatedResult<Product>> {
    const { page = 1, limit = 10, search, orderBy = 'createdAt', order = 'desc', categoryId, isActive } = opts;

    const offset = (page - 1) * limit;

    const where: FilterQuery<Product> = {};

    if (typeof isActive === 'boolean') {
      where.isActive = isActive;
    }

    if (search) {
      const pattern = `%${search}%`;
      where.$or = [{ title: { $ilike: pattern } },];
    }

    if (categoryId) {
      // filter by related category (product has a single `category` relation)
      Object.assign(where, { category: { id: categoryId } } as unknown as FilterQuery<Product>);
    }

    const [data, total] = await this.findAndCount(where, {
      limit,
      offset,
      orderBy: { [orderBy]: order.toLowerCase() as 'asc' | 'desc' },
      populate: [],
    });

    const totalPages = Math.ceil(total / limit);

    return {
      data,
      meta: {
        total,
        page,
        limit,
        totalPages,
      },
    };

  }
}