import { Config, Inject, Provide } from '@midwayjs/core';
import { WPService } from './wp.service';
import { WpSite } from '../interface';
import { WpProduct } from '../entity/wp_product.entity';
import { InjectEntityModel } from '@midwayjs/typeorm';
import { And, Like, Not, Repository } from 'typeorm';
import { Variation } from '../entity/variation.entity';
import {
  QueryWpProductDTO,
  UpdateVariationDTO,
  UpdateWpProductDTO,
} from '../dto/wp_product.dto';
import { Product } from '../entity/product.entty';

@Provide()
export class WpProductService {
  @Config('wpSite')
  sites: WpSite[];

  @Inject()
  private readonly wpApiService: WPService;

  @InjectEntityModel(WpProduct)
  wpProductModel: Repository<WpProduct>;

  @InjectEntityModel(Variation)
  variationModel: Repository<Variation>;

  geSite(id: string): WpSite {
    let idx = this.sites.findIndex(item => item.id === id);
    return this.sites[idx];
  }

  async syncAllSites() {
    for (const site of this.sites) {
      const products = await this.wpApiService.getProducts(site);
      for (const product of products) {
        const variations =
          product.type === 'variable'
            ? await this.wpApiService.getVariations(site, product.id)
            : [];
        await this.syncProductAndVariations(site.id, product, variations);
      }
    }
  }

  async syncSite(siteId: string) {
    const site = this.geSite(siteId);
    const products = await this.wpApiService.getProducts(site);
    for (const product of products) {
      const variations =
        product.type === 'variable'
          ? await this.wpApiService.getVariations(site, product.id)
          : [];
      await this.syncProductAndVariations(site.id, product, variations);
    }
  }

  async findProduct(
    siteId: string,
    externalProductId: string
  ): Promise<WpProduct | null> {
    return await this.wpProductModel.findOne({
      where: { siteId, externalProductId },
    });
  }

  async findVariation(
    siteId: string,
    externalProductId: string,
    externalVariationId: string
  ): Promise<Variation | null> {
    return await this.variationModel.findOne({
      where: { siteId, externalProductId, externalVariationId },
    });
  }

  async updateWpProduct(
    siteId: string,
    productId: string,
    product: UpdateWpProductDTO
  ) {
    let existingProduct = await this.findProduct(siteId, productId);
    if (existingProduct) {
      existingProduct.name = product.name;
      existingProduct.sku = product.sku;
      product.regular_price &&
        (existingProduct.regular_price = product.regular_price);
      product.sale_price && (existingProduct.sale_price = product.sale_price);
      await this.wpProductModel.save(existingProduct);
    }
  }

  async updateWpProductVaritation(
    siteId: string,
    productId: string,
    variationId: string,
    variation: UpdateVariationDTO
  ) {
    const existingVariation = await this.findVariation(
      siteId,
      productId,
      variationId
    );

    if (existingVariation) {
      existingVariation.name = variation.name;
      existingVariation.sku = variation.sku;
      variation.regular_price &&
        (existingVariation.regular_price = variation.regular_price);
      variation.sale_price &&
        (existingVariation.sale_price = variation.sale_price);
      await this.variationModel.save(existingVariation);
    }
  }

  async syncProductAndVariations(
    siteId: string,
    product: WpProduct,
    variations: Variation[]
  ) {
    // 1. 处理产品同步
    let existingProduct = await this.findProduct(siteId, String(product.id));

    if (existingProduct) {
      existingProduct.name = product.name;
      existingProduct.status = product.status;
      existingProduct.type = product.type;
      existingProduct.sku = product.sku;
      product.regular_price &&
        (existingProduct.regular_price = product.regular_price);
      product.sale_price && (existingProduct.sale_price = product.sale_price);
      existingProduct.on_sale = product.on_sale;
      existingProduct.metadata = product.metadata;
      await this.wpProductModel.save(existingProduct);
    } else {
      existingProduct = this.wpProductModel.create({
        siteId,
        externalProductId: String(product.id),
        sku: product.sku,
        status: product.status,
        name: product.name,
        type: product.type,
        ...(product.regular_price
          ? { regular_price: product.regular_price }
          : {}),
        ...(product.sale_price ? { sale_price: product.sale_price } : {}),
        on_sale: product.on_sale,
        metadata: product.metadata,
      });
      await this.wpProductModel.save(existingProduct);
    }

    // 2. 处理变体同步
    if (product.type === 'variable') {
      const currentVariations = await this.variationModel.find({
        where: { siteId, externalProductId: String(product.id) },
      });
      const syncedVariationIds = new Set(variations.map(v => String(v.id)));
      const variationsToDelete = currentVariations.filter(
        dbVariation =>
          !syncedVariationIds.has(String(dbVariation.externalVariationId))
      );
      if (variationsToDelete.length > 0) {
        const idsToDelete = variationsToDelete.map(v => v.id);
        await this.variationModel.delete(idsToDelete);
      }

      for (const variation of variations) {
        const existingVariation = await this.findVariation(
          siteId,
          String(product.id),
          String(variation.id)
        );

        if (existingVariation) {
          existingVariation.name = variation.name;
          existingVariation.attributes = variation.attributes;
          variation.regular_price &&
            (existingVariation.regular_price = variation.regular_price);
          variation.sale_price &&
            (existingVariation.sale_price = variation.sale_price);
          existingVariation.on_sale = variation.on_sale;
          await this.variationModel.save(existingVariation);
        } else {
          const newVariation = this.variationModel.create({
            siteId,
            externalProductId: String(product.id),
            externalVariationId: String(variation.id),
            productId: existingProduct.id,
            sku: variation.sku,
            name: variation.name,
            ...(variation.regular_price
              ? { regular_price: variation.regular_price }
              : {}),
            ...(variation.sale_price
              ? { sale_price: variation.sale_price }
              : {}),
            on_sale: variation.on_sale,
            attributes: variation.attributes,
          });
          await this.variationModel.save(newVariation);
        }
      }
    } else {
      // 清理之前的变体
      await this.variationModel.delete({
        siteId,
        externalProductId: String(product.id),
      });
    }
  }

  async syncVariation(siteId: string, productId: string, variation: Variation) {
    let existingProduct = await this.findProduct(siteId, String(productId));
    if (!existingProduct) return;
    const existingVariation = await this.findVariation(
      siteId,
      String(productId),
      String(variation.id)
    );

    if (existingVariation) {
      existingVariation.name = variation.name;
      existingVariation.attributes = variation.attributes;
      variation.regular_price &&
        (existingVariation.regular_price = variation.regular_price);
      variation.sale_price &&
        (existingVariation.sale_price = variation.sale_price);
      existingVariation.on_sale = variation.on_sale;
      await this.variationModel.save(existingVariation);
    } else {
      const newVariation = this.variationModel.create({
        siteId,
        externalProductId: String(productId),
        externalVariationId: String(variation.id),
        productId: existingProduct.id,
        sku: variation.sku,
        name: variation.name,
        ...(variation.regular_price
          ? { regular_price: variation.regular_price }
          : {}),
        ...(variation.sale_price ? { sale_price: variation.sale_price } : {}),
        on_sale: variation.on_sale,
        attributes: variation.attributes,
      });
      await this.variationModel.save(newVariation);
    }
  }

  async getProductList(param: QueryWpProductDTO) {
    const { current = 1, pageSize = 10, name, siteId, status } = param;
    // 第一步：先查询分页的产品
    const where: any = {};
    if (siteId) {
      where.siteId = siteId;
    }
    const nameFilter = name ? name.split(' ').filter(Boolean) : [];
    if (nameFilter.length > 0) {
      const nameConditions = nameFilter.map(word => Like(`%${word}%`));
      where.name = And(...nameConditions);
    }
    if (status) {
      where.status = status;
    }
    const products = await this.wpProductModel.find({
      where,
      skip: (current - 1) * pageSize,
      take: pageSize,
    });
    const total = await this.wpProductModel.count({
      where,
    });
    if (products.length === 0) {
      return {
        items: [],
        total,
        current,
        pageSize,
      };
    }

    const variationQuery = this.wpProductModel
      .createQueryBuilder('wp_product')
      .leftJoin(Variation, 'variation', 'variation.productId = wp_product.id')
      .leftJoin(
        Product,
        'product',
        'JSON_UNQUOTE(JSON_EXTRACT(wp_product.constitution, "$.sku")) = product.sku'
      )
      .leftJoin(
        Product,
        'variation_product',
        'JSON_UNQUOTE(JSON_EXTRACT(variation.constitution, "$.sku")) = variation_product.sku'
      )
      .select([
        'wp_product.*',
        'variation.id as variation_id',
        'variation.siteId as variation_siteId',
        'variation.externalProductId as variation_externalProductId',
        'variation.externalVariationId as variation_externalVariationId',
        'variation.productId as variation_productId',
        'variation.sku as variation_sku',
        'variation.name as variation_name',
        'variation.regular_price as variation_regular_price',
        'variation.sale_price as variation_sale_price',
        'variation.on_sale as variation_on_sale',
        'variation.constitution as variation_constitution',
        'product.name as product_name', // 关联查询返回 product.name
        'variation_product.name as variation_product_name', // 关联查询返回 variation 的产品 name
      ])
      .where('wp_product.id IN (:...ids)', {
        ids: products.map(product => product.id),
      });

    const rawResult = await variationQuery.getRawMany();

    // 数据转换
    const items = rawResult.reduce((acc, row) => {
      let product = acc.find(p => p.id === row.id);
      if (!product) {
        product = {
          ...Object.keys(row)
            .filter(key => !key.startsWith('variation_'))
            .reduce((obj, key) => {
              obj[key] = row[key];
              return obj;
            }, {}),
          variations: [],
        };
        acc.push(product);
      }

      if (row.variation_id) {
        const variation: any = Object.keys(row)
          .filter(key => key.startsWith('variation_'))
          .reduce((obj, key) => {
            obj[key.replace('variation_', '')] = row[key];
            return obj;
          }, {});
        variation.constitution =
          variation?.constitution?.map(item => {
            const product = item.sku
              ? { ...item, name: row.variation_product_name }
              : item;
            return product;
          }) || [];

        product.variations.push(variation);
      }

      product.constitution =
        product?.constitution?.map(item => {
          const productWithName = item.sku
            ? { ...item, name: row.product_name }
            : item;
          return productWithName;
        }) || [];

      return acc;
    }, []);

    return {
      items,
      total,
      current,
      pageSize,
    };
  }

  /**
   * 检查 SKU 是否重复
   * @param sku SKU 编码
   * @param excludeSiteId 需要排除的站点 ID
   * @param excludeProductId 需要排除的产品 ID
   * @param excludeVariationId 需要排除的变体 ID
   * @returns 是否重复
   */
  async isSkuDuplicate(
    sku: string,
    excludeSiteId?: string,
    excludeProductId?: string,
    excludeVariationId?: string
  ): Promise<boolean> {
    if (!sku) return false;
    const where: any = { sku };
    const varWhere: any = { sku };
    if (excludeVariationId) {
      varWhere.siteId = Not(excludeSiteId);
      varWhere.externalProductId = Not(excludeProductId);
      varWhere.externalVariationId = Not(excludeVariationId);
    } else {
      where.externalProductId = Not(excludeProductId);
      where.externalProductId = Not(excludeProductId);
    }

    const productDuplicate = await this.wpProductModel.findOne({
      where,
    });

    if (productDuplicate) {
      return true;
    }

    const variationDuplicate = await this.variationModel.findOne({
      where: varWhere,
    });

    return !!variationDuplicate;
  }

  /**
   * 设置产品或变体的构成成分
   */
  async setConstitution(
    id: number,
    isProduct: boolean,
    constitution: { sku: string; quantity: number }[]
  ): Promise<void> {
    if (isProduct) {
      // 更新产品的 constitution
      const product = await this.wpProductModel.findOne({ where: { id } });
      if (!product) {
        throw new Error(`未找到 ID 为 ${id} 的产品`);
      }
      product.constitution = constitution;
      await this.wpProductModel.save(product);
    } else {
      // 更新变体的 constitution
      const variation = await this.variationModel.findOne({ where: { id } });
      if (!variation) {
        throw new Error(`未找到 ID 为 ${id} 的变体`);
      }
      variation.constitution = constitution;
      await this.variationModel.save(variation);
    }
  }

  async delWpProduct(siteId: string, productId: string) {
    const product = await this.wpProductModel.findOne({
      where: { siteId, externalProductId: productId },
    });
    if (!product) throw new Error('未找到该商品');
    await this.variationModel.delete({ siteId, externalProductId: productId });
    await this.wpProductModel.delete({ siteId, externalProductId: productId });
  }
}