/**
 * 价格计算工具类
 * 根据当前地址、日期、宠物类型等因素计算价格，保留2位小数
 */
class PriceCalculator {
  constructor(priceConfig) {
    this.priceConfig = priceConfig || this.getDefaultPriceConfig();
  }

  // 获取默认价格配置
  getDefaultPriceConfig() {
    return {
      basePrice: {
        normal: 75,
        holiday: 85,
        weekend: 80
      },
      memberDiscount: {
        'new': 0.95,
        'regular': 0.9,
        'silver': 0.88,
        'gold': 0.85
      },
      preFamiliarize: {
        price: 40,
        holidayRate: 1.2
      },
      multiService: {
        two: {
          price: 45,
          holidayRate: 1.1
        },
        three: {
          price: 130,
          holidayRate: 1.1
        }
      },
      petExtra: {
        largeDog: {
          price: 40,
          holidayRate: 1.1
        },
        mediumDog: {
          price: 30,
          holidayRate: 1.1
        },
        smallDog: {
          price: 15,
          holidayRate: 1.1
        },
        cat: {
          price: 10,
          holidayRate: 1.1
        }
      },
      freeQuota: {
        threshold: 30,
        rules: [
          {
            type: 'cat',
            count: 3,
            freeAmount: 30,
            description: '3只及以上猫免费30元'
          },
          {
            type: 'smallDog',
            count: 2,
            freeAmount: 30,
            description: '2只及以上小型犬免费30元'
          },
          {
            type: 'mediumDog',
            count: 1,
            freeAmount: 30,
            description: '1只及以上中型犬免费30元'
          },
          {
            type: 'mixed',
            count: 0,
            freeAmount: 25,
            description: '混合类型免费25元(1猫1小型犬)'
          }
        ]
      },
      holidays: [
        '2024-07-15', '2024-07-16', '2024-07-17',
        '2024-10-01', '2024-10-02', '2024-10-03'
      ],
      weekends: [0, 6],
      customServices: {
        priceConfig: {},
        holidayRate: 1.1
      },
      cityConfig: {
        priceRates: {
          'beijing': 1.2,
          'shanghai': 1.15,
          'guangzhou': 1.1,
          'shenzhen': 1.15,
          'default': 1.0
        }
      }
    };
  }

  // 保留2位小数
  roundToTwoDecimals(value) {
    return Math.round(value * 100) / 100;
  }

  // 根据地址获取城市代码
  getCityCode(address) {
    if (!address) return 'default';
    
    const cityMapping = {
      '北京': 'beijing',
      '上海': 'shanghai',
      '广州': 'guangzhou',
      '深圳': 'shenzhen'
    };

    for (const [cityName, cityCode] of Object.entries(cityMapping)) {
      if (address.includes(cityName)) {
        return cityCode;
      }
    }
    
    return 'default';
  }

  // 获取城市价格倍率
  getCityPriceRate(address) {
    const cityCode = this.getCityCode(address);
    return this.priceConfig.cityConfig.priceRates[cityCode] || 1.0;
  }

  // 判断日期类型
  getDatePriceType(dateString) {
    const date = new Date(dateString);
    const dayOfWeek = date.getDay();
    
    if (this.priceConfig.holidays.includes(dateString)) {
      return 'holiday';
    }
    
    if (this.priceConfig.weekends.includes(dayOfWeek)) {
      return 'weekend';
    }
    
    return 'normal';
  }

  // 获取基础服务价格
  getBasePriceByDate(dateString) {
    const priceType = this.getDatePriceType(dateString);
    return this.priceConfig.basePrice[priceType] || this.priceConfig.basePrice.normal;
  }

  // 获取宠物额外费用
  getPetExtraCost(pet, dateString) {
    const priceType = this.getDatePriceType(dateString);
    let baseCost = 0;
    let holidayRate = 1;

    if (pet.petType === 'cat') {
      baseCost = this.priceConfig.petExtra.cat.price;
      holidayRate = this.priceConfig.petExtra.cat.holidayRate;
    } else if (pet.petType === 'dog' && pet.bodyType.includes('小型')) {
      baseCost = this.priceConfig.petExtra.smallDog.price;
      holidayRate = this.priceConfig.petExtra.smallDog.holidayRate;
    } else if (pet.petType === 'dog' && pet.bodyType.includes('中型')) {
      baseCost = this.priceConfig.petExtra.mediumDog.price;
      holidayRate = this.priceConfig.petExtra.mediumDog.holidayRate;
    } else if (pet.petType === 'dog' && pet.bodyType.includes('大型')) {
      baseCost = this.priceConfig.petExtra.largeDog.price;
      holidayRate = this.priceConfig.petExtra.largeDog.holidayRate;
    }

    if (priceType === 'holiday') {
      baseCost = baseCost * holidayRate;
    }

    return this.roundToTwoDecimals(baseCost);
  }

  // 获取多次服务费用
  getMultiServiceCost(feedCount, dateString) {
    const priceType = this.getDatePriceType(dateString);
    let baseCost = 0;
    let holidayRate = 1;

    if (feedCount === 2) {
      baseCost = this.priceConfig.multiService.two.price;
      holidayRate = this.priceConfig.multiService.two.holidayRate;
    } else if (feedCount === 3) {
      baseCost = this.priceConfig.multiService.three.price;
      holidayRate = this.priceConfig.multiService.three.holidayRate;
    }

    if (priceType === 'holiday') {
      baseCost = baseCost * holidayRate;
    }

    return this.roundToTwoDecimals(baseCost);
  }

  // 获取提前熟悉费用
  getPreFamiliarizeCost(dateString) {
    const priceType = this.getDatePriceType(dateString);
    let baseCost = this.priceConfig.preFamiliarize.price;
    
    if (priceType === 'holiday') {
      baseCost = baseCost * this.priceConfig.preFamiliarize.holidayRate;
    }

    return this.roundToTwoDecimals(baseCost);
  }

  // 计算套餐免费额度
  calculateFreeQuota(pets) {
    let totalPetCost = pets.reduce((acc, pet) => {
      return acc + this.getPetExtraCost(pet, pet.serviceDate);
    }, 0);

    if (totalPetCost <= this.priceConfig.freeQuota.threshold) {
      return 0;
    }

    let freeAmount = 0;
    const petCounts = {
      cat: pets.filter(pet => pet.petType === 'cat').length,
      smallDog: pets.filter(pet => pet.petType === 'dog' && pet.bodyType.includes('小型')).length,
      mediumDog: pets.filter(pet => pet.petType === 'dog' && pet.bodyType.includes('中型')).length,
      largeDog: pets.filter(pet => pet.petType === 'dog' && pet.bodyType.includes('大型')).length
    };

    for (const rule of this.priceConfig.freeQuota.rules) {
      if (rule.type === 'cat' && petCounts.cat >= rule.count) {
        freeAmount += rule.freeAmount;
        petCounts.cat -= rule.count;
      } else if (rule.type === 'smallDog' && petCounts.smallDog >= rule.count) {
        freeAmount += rule.freeAmount;
        petCounts.smallDog -= rule.count;
      } else if (rule.type === 'mediumDog' && petCounts.mediumDog >= rule.count) {
        freeAmount += rule.freeAmount;
        petCounts.mediumDog -= rule.count;
      } else if (rule.type === 'mixed' && petCounts.cat >= 1 && petCounts.smallDog >= 1) {
        freeAmount += rule.freeAmount;
        petCounts.cat -= 1;
        petCounts.smallDog -= 1;
      }
    }

    return this.roundToTwoDecimals(freeAmount);
  }

  // 计算会员折扣
  calculateMemberDiscount(originalPrice, memberLevel) {
    const discount = this.priceConfig.memberDiscount[memberLevel] || 1;
    const discountedPrice = originalPrice * discount;
    return this.roundToTwoDecimals(discountedPrice);
  }

  // 计算定制服务费用
  calculateCustomServiceCost(customServices, dateString) {
    const priceType = this.getDatePriceType(dateString);
    let totalCost = 0;

    customServices.forEach(service => {
      let servicePrice = service.price * service.quantity;
      
      if (priceType === 'holiday') {
        servicePrice = servicePrice * this.priceConfig.customServices.holidayRate;
      }
      
      totalCost += servicePrice;
    });

    return this.roundToTwoDecimals(totalCost);
  }

  // 计算单日总价
  calculateDailyPrice(pets, dateString, feedCount = 1, customServices = []) {
    // 明细数组
    let priceDetails = [];
    // 基础服务费用
    let baseServiceCost = this.getBasePriceByDate(dateString);
    priceDetails.push({
      name: '专业喂养',
      formula: `¥${baseServiceCost.toFixed(2)} x ${pets.length}天`,
      amount: this.roundToTwoDecimals(baseServiceCost * pets.length)
    });
    // 宠物额外费用
    let petExtraCost = pets.reduce((acc, pet) => {
      return acc + this.getPetExtraCost(pet, dateString);
    }, 0);
    if (petExtraCost > 0) {
      // 细分每只宠物
      pets.forEach(pet => {
        const extra = this.getPetExtraCost(pet, dateString);
        if (extra > 0) {
          priceDetails.push({
            name: '额外宠物费用',
            formula: `${pet.petType === 'cat' ? '猫' : pet.bodyType}${pet.petType === 'dog' ? '犬' : ''} 1只 x ¥${extra.toFixed(2)}`,
            amount: extra
          });
        }
      });
    }
    // 多次服务费用
    let multiServiceCost = this.getMultiServiceCost(feedCount, dateString);
    if (multiServiceCost > 0) {
      priceDetails.push({
        name: '上门次数',
        formula: `${feedCount === 2 ? '1天2次' : feedCount === 3 ? '1天3次' : '1天1次'} x ¥${multiServiceCost.toFixed(2)}`,
        amount: multiServiceCost
      });
    }
    // 定制服务费用
    let customServiceCost = this.calculateCustomServiceCost(customServices, dateString);
    if (customServiceCost > 0) {
      customServices.forEach(service => {
        if (service.quantity > 0) {
          priceDetails.push({
            name: '定制服务',
            formula: `${service.name} | ¥${service.price} x ${service.quantity}次`,
            amount: this.roundToTwoDecimals(service.price * service.quantity)
          });
        }
      });
    }
    // 计算免费额度
    let freeQuota = this.calculateFreeQuota(pets);
    if (freeQuota > 0) {
      priceDetails.push({
        name: '套餐免费额度',
        formula: `-¥${freeQuota.toFixed(2)}`,
        amount: -freeQuota
      });
    }
    // 总价（未折扣）
    let totalOriginalPrice = baseServiceCost + petExtraCost + multiServiceCost + customServiceCost - freeQuota;
    return {
      baseServiceCost: this.roundToTwoDecimals(baseServiceCost),
      petExtraCost: this.roundToTwoDecimals(petExtraCost),
      multiServiceCost: this.roundToTwoDecimals(multiServiceCost),
      customServiceCost: this.roundToTwoDecimals(customServiceCost),
      freeQuota: this.roundToTwoDecimals(freeQuota),
      totalOriginalPrice: this.roundToTwoDecimals(totalOriginalPrice),
      priceType: this.getDatePriceType(dateString),
      priceDetails // 新增明细
    };
  }

  // 计算订单总价（含城市倍率和会员折扣）
  calculateOrderTotal(orderData, userAddress, memberLevel = 'new') {
    const cityRate = this.getCityPriceRate(userAddress);
    // 计算每日费用
    const dailyPrices = orderData.pets.map(pet => {
      const dailyPrice = this.calculateDailyPrice(
        [pet], 
        pet.serviceDate, 
        pet.feedCount, 
        pet.customServices || []
      );
      // 应用城市倍率
      dailyPrice.totalWithCityRate = this.roundToTwoDecimals(dailyPrice.totalOriginalPrice * cityRate);
      // 明细也加上城市倍率
      dailyPrice.priceDetails = dailyPrice.priceDetails.map(detail => ({
        ...detail,
        amount: this.roundToTwoDecimals(detail.amount * cityRate),
        formula: cityRate !== 1.0 ? `${detail.formula} x 城市倍率${cityRate}` : detail.formula
      }));
      return dailyPrice;
    });
    // 汇总明细
    let priceDetails = [];
    dailyPrices.forEach((d, idx) => {
      d.priceDetails.forEach(item => {
        priceDetails.push({
          ...item,
          date: orderData.pets[idx]?.serviceDate || ''
        });
      });
    });
    // 提前熟悉费用
    let preFamiliarizeCost = 0;
    if (orderData.needPreFamiliarize && orderData.needPreFamiliarize.length > 0) {
      const firstServiceDate = orderData.pets[0]?.serviceDate;
      if (firstServiceDate) {
        preFamiliarizeCost = this.getPreFamiliarizeCost(firstServiceDate);
        preFamiliarizeCost = this.roundToTwoDecimals(preFamiliarizeCost * cityRate);
        priceDetails.push({
          name: '提前熟悉',
          formula: `¥${this.getPreFamiliarizeCost(firstServiceDate)} x 城市倍率${cityRate}`,
          amount: preFamiliarizeCost
        });
      }
    }
    // 计算总价
    let totalOriginalPrice = dailyPrices.reduce((acc, daily) => {
      return acc + daily.totalWithCityRate;
    }, 0) + preFamiliarizeCost;
    // 应用会员折扣
    const totalWithDiscount = this.calculateMemberDiscount(totalOriginalPrice, memberLevel);
    return {
      dailyPrices,
      preFamiliarizeCost,
      totalOriginalPrice: this.roundToTwoDecimals(totalOriginalPrice),
      totalWithDiscount: this.roundToTwoDecimals(totalWithDiscount),
      cityRate: this.roundToTwoDecimals(cityRate),
      memberDiscount: this.roundToTwoDecimals(totalOriginalPrice - totalWithDiscount),
      memberLevel,
      priceDetails // 新增明细
    };
  }

}

export default PriceCalculator;