import {
  HttpException,
  HttpStatus,
  Injectable,
  UnauthorizedException,
} from '@nestjs/common';
import { EntityNotFoundError, Repository } from 'typeorm';
import { Product } from './entities/product.entity';
import { InjectRepository } from '@nestjs/typeorm';
import { CreateProductDto } from './dto/product/create-product.dto';
import { ProductSubCategoriesService } from './product-sub-categories.service';
import { UpdateProductDto } from './dto/product/update-product.dto';
import { ProductHistoryPrice } from './entities/product-history-price.entity';
import { productType } from '../helper/enum-list';
import { UpdatePriceProductDto } from './dto/product/update-price-product.dto';
import { UsersService } from '../users/users.service';
import { SupplierService } from '../users/supplier/supplier.service';
import { type } from 'os';

export class ProductService {
  constructor(
    @InjectRepository(Product)
    private productRepository: Repository<Product>,
    @InjectRepository(ProductHistoryPrice)
    private productHistoryPrice: Repository<ProductHistoryPrice>,
    private productSubCategoriesService: ProductSubCategoriesService,
    private usersService: UsersService,
    private supplierService: SupplierService,
  ) {}

  async create(createProductDto: CreateProductDto) {
    const subCategories = await this.productSubCategoriesService.findOne(
      createProductDto.subCategoriesId,
    );

    const result = await this.productRepository.insert({
      name: createProductDto.name,
      code: createProductDto.code,
      status: createProductDto.status,
      sub_categories: subCategories,
      price: createProductDto.price,
    });

    await this.productHistoryPrice.insert({
      product: result.identifiers[0],
      type: productType.NORMAL,
      price: createProductDto.price,
      mark_up_price: createProductDto.markUpPrice,
      startDate: new Date(),
      endDate: null,
    });

    return this.productRepository.findOneOrFail(result.identifiers[0].id);
  }

  async findAll(page, supplier, categories, subCategories) {
    if (supplier == 'null' || !supplier) {
      supplier = (await this.supplierService.findByActive()).id;
    }
    const baseQuery = this.productRepository
      .createQueryBuilder('product')
      .leftJoin('product.sub_categories', 'sub_categories')
      .leftJoin('sub_categories.category', 'category')
      .where('product.supplier_id = :supplier_id', {
        supplier_id: supplier,
      })
      .leftJoinAndMapOne(
        'product.currentPrice',
        'product.priceHistory',
        'current_price',
        'current_price.partner_id is null',
      );

    if (subCategories != 'null' && subCategories) {
      baseQuery.where('product.sub_categories_id = :id', {
        id: subCategories,
      });
    }

    if (categories != 'null' && categories) {
      baseQuery.where('sub_categories.category_id = :id', {
        id: categories,
      });
    }

    const data = await baseQuery
      .skip(page * 10)
      .take(10)
      .getMany();

    const totalData = await baseQuery.getCount();

    return {
      data,
      count: totalData,
    };
  }

  async findAllByCategories(page, subCategories, supplier) {
    const baseQuery = this.productRepository
      .createQueryBuilder('product')
      .leftJoin('product.sub_categories', 'sub_categories')
      .where(
        'sub_categories.category_id = :id and product.supplier_id = :supplier_id',
        {
          id: subCategories,
          supplier_id: supplier,
        },
      )
      .leftJoinAndMapOne(
        'product.currentPrice',
        'product.priceHistory',
        'current_price',
        'current_price.partner_id is null',
      );

    const data = await baseQuery
      .skip(page * 10)
      .take(10)
      .getMany();

    const totalData = await baseQuery.getCount();

    return {
      data,
      count: totalData,
    };
  }

  async findAllBySubCategories(page, subCategories, supplier) {
    if (supplier != 'null' && !supplier) {
      supplier = (await this.supplierService.findByActive()).id;
    }
    const baseQuery = this.productRepository
      .createQueryBuilder('product')
      .leftJoin('product.sub_categories', 'sub_categories')
      .where('product.supplier_id = :supplier_id', {
        supplier_id: supplier,
      })
      .leftJoinAndMapOne(
        'product.currentPrice',
        'product.priceHistory',
        'current_price',
        'current_price.partner_id is null',
      );

    if (subCategories != 'null' && subCategories) {
      baseQuery.where('product.sub_categories_id = :id', {
        id: subCategories,
      });
    }

    const data = await baseQuery
      .skip(page * 10)
      .take(10)
      .getMany();

    const totalData = await baseQuery.getCount();

    return {
      data,
      count: totalData,
    };
  }

  async findAllForPartner(
    page: number,
    pageSize: number,
    categories: string,
    username: string,
  ) {
    const user = await this.usersService.findOneByUsername(username);
    const supplier = await this.supplierService.findByActive();

    const baseQuery = this.productRepository
      .createQueryBuilder('product')
      .leftJoin('product.sub_categories', 'sub_categories')
      .where(
        'sub_categories.category_id = :id and product.supplier_id = :supplier_id',
        {
          id: categories,
          supplier_id: supplier.id,
        },
      )
      .leftJoinAndMapOne(
        'product.currentPrice',
        'product.priceHistory',
        'current_price',
        'current_price.partner_id = :id_partner and current_price.end_date is NULL',
      )
      .setParameter('id_partner', user.partner.id);

    const data = await baseQuery
      .skip(page * pageSize)
      .take(pageSize)
      .getMany();

    const totalData = await baseQuery.getCount();

    return {
      data,
      count: totalData,
    };
  }

  async findOne(code: string) {
    try {
      return await this.productRepository.findOneOrFail({
        relations: ['supplier'],
        where: {
          code: code,
        },
      });
    } catch (e) {
      if (e instanceof EntityNotFoundError) {
        throw new HttpException(
          {
            statusCode: HttpStatus.NOT_FOUND,
            error: 'Product not found',
          },
          HttpStatus.NOT_FOUND,
        );
      } else {
        throw e;
      }
    }
  }

  async update(id: string, updateProductDto: UpdateProductDto) {
    try {
      await this.productRepository.findOneOrFail(id);
    } catch (e) {
      if (e instanceof EntityNotFoundError) {
        throw new HttpException(
          {
            statusCode: HttpStatus.NOT_FOUND,
            error: 'Product not found',
          },
          HttpStatus.NOT_FOUND,
        );
      } else {
        throw e;
      }
    }

    const subCategories = await this.productSubCategoriesService.findOne(
      updateProductDto.subCategoriesId,
    );

    const result = await this.productRepository.update(id, {
      name: updateProductDto.name,
      code: updateProductDto.code,
      status: updateProductDto.status,
      sub_categories: subCategories,
    });

    return this.productRepository.findOneOrFail(id);
  }

  async updatePrice(
    code: string,
    updatePriceProductDto: UpdatePriceProductDto,
  ) {
    const product = await this.findOne(code);

    await this.productHistoryPrice.insert({
      product: product,
      type: updatePriceProductDto.type,
      price: updatePriceProductDto.price,
      mark_up_price: updatePriceProductDto.markUpPrice,
      startDate: updatePriceProductDto.startDate,
      endDate: updatePriceProductDto.endDate,
    });

    return true;
  }

  async remove(id: string) {
    try {
      await this.productRepository.findOneOrFail(id);
    } catch (e) {
      if (e instanceof EntityNotFoundError) {
        throw new HttpException(
          {
            statusCode: HttpStatus.NOT_FOUND,
            error: 'Product not found',
          },
          HttpStatus.NOT_FOUND,
        );
      } else {
        throw e;
      }
    }

    await this.productRepository.delete(id);
  }
}