package service

import (
	"encoding/json"
	"errors"
	"gorm.io/gorm"
	"log"
	"math"
	"psi/database"
	"psi/models"
	"psi/models/request"
	"psi/models/response"
	"strconv"
	"time"
)

type LogisticsService struct{}

// GetLogisticsList 获取物流模板列表
func (s *LogisticsService) GetLogisticsList(req request.QueryLogisticsRequest, db ...*gorm.DB) ([]response.LogisticsResponse, int64, error) {
	databaseConn := database.OptionalDB(db...)

	if req.Page < 1 {
		req.Page = 1
	}
	if req.PageSize < 1 || req.PageSize > 100 {
		req.PageSize = 20
	}

	// 如果提供了 about_id，先查询该租户下的所有仓库
	var warehouseIDs []int64
	if req.AboutID > 0 {
		if err := databaseConn.Model(&models.Warehouse{}).
			Where("about_id = ? AND is_del = ?", req.AboutID, 0).
			Pluck("id", &warehouseIDs).Error; err != nil {
			return nil, 0, errors.New("查询仓库信息失败")
		}

		// 如果没有找到仓库，直接返回空结果
		if len(warehouseIDs) == 0 {
			return []response.LogisticsResponse{}, 0, nil
		}
	}

	query := databaseConn.Model(&models.Logistics{}).Where("del_flag = ?", "0")

	// 如果有仓库ID列表，只查询这些仓库关联的物流模板
	if len(warehouseIDs) > 0 {
		query = query.Where("id IN (?)", warehouseIDs)
	}

	if req.Keyword != "" {
		query = query.Where("template_name LIKE ? OR delivery_province LIKE ? OR delivery_city LIKE ?",
			"%"+req.Keyword+"%", "%"+req.Keyword+"%", "%"+req.Keyword+"%")
	}

	if req.Status != nil {
		query = query.Where("status = ?", *req.Status)
	}

	// === debug: 打印完整SQL ===
	log.Printf("[GetLogisticsList] 请求参数 page=%d pageSize=%d keyword=%q about_id=%d", req.Page, req.PageSize, req.Keyword, req.AboutID)
	// === debug end ===

	var total int64
	if err := query.Debug().Count(&total).Error; err != nil {
		return nil, 0, errors.New("查询物流模板总数失败")
	}

	var logistics []models.Logistics
	offset := (req.Page - 1) * req.PageSize
	if err := query.Debug().Order("id DESC").Offset(offset).Limit(req.PageSize).Find(&logistics).Error; err != nil {
		return nil, 0, errors.New("查询物流模板列表失败")
	}

	responses := make([]response.LogisticsResponse, 0, len(logistics))
	for _, item := range logistics {
		resp := response.ConvertLogisticsToResponse(item)
		responses = append(responses, resp)
	}

	return responses, total, nil
}

// GetLogisticsByID 获取物流模板详情
func (s *LogisticsService) GetLogisticsByID(id uint64, db ...*gorm.DB) (*response.LogisticsResponse, error) {
	databaseConn := database.OptionalDB(db...)

	var logistics models.Logistics
	if err := databaseConn.Where("id = ? AND del_flag = ?", id, "0").First(&logistics).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, errors.New("物流模板不存在")
		}
		return nil, errors.New("查询物流模板失败")
	}

	resp := response.ConvertLogisticsToResponse(logistics)
	return &resp, nil
}

// CreateLogistics 创建物流模板
// calculateMinFirstFee 从 shipping_range JSON 中计算最小首费
func (s *LogisticsService) calculateMinFirstFee(shippingRange string) (float64, error) {
	if shippingRange == "" {
		return 0, errors.New("运送范围不能为空")
	}

	var rangeMap map[string][]interface{}
	if err := json.Unmarshal([]byte(shippingRange), &rangeMap); err != nil {
		return 0, errors.New("运送范围格式错误")
	}

	minFee := math.MaxFloat64
	found := false

	for _, values := range rangeMap {
		if len(values) < 2 {
			continue
		}

		// values[1] 是首费，可能是 string 或 float64
		var fee float64
		switch v := values[1].(type) {
		case float64:
			fee = v
		case string:
			var err error
			fee, err = strconv.ParseFloat(v, 64)
			if err != nil {
				continue
			}
		default:
			continue
		}

		if fee < minFee {
			minFee = fee
		}
		found = true
	}

	if !found {
		return 0, errors.New("运送范围数据格式错误")
	}

	return minFee, nil
}

// CreateLogistics 创建物流模板
func (s *LogisticsService) CreateLogistics(req request.CreateLogisticsRequest, db ...*gorm.DB) (uint64, error) {
	databaseConn := database.OptionalDB(db...)

	var count int64
	databaseConn.Model(&models.Logistics{}).
		Where("template_name = ? AND del_flag = ?", req.TemplateName, "0").
		Count(&count)
	if count > 0 {
		return 0, errors.New("物流模板名称已存在")
	}

	// 计算最小首费
	minFirPrice, err := s.calculateMinFirstFee(req.ShippingRange)
	if err != nil {
		return 0, err
	}

	now := time.Now()
	logistics := models.Logistics{
		TemplateName:     req.TemplateName,
		DeliveryProvince: req.DeliveryProvince,
		DeliveryCity:     req.DeliveryCity,
		DeliveryArea:     req.DeliveryArea,
		DeliveryAddress:  req.DeliveryAddress,
		PricingMethod:    req.PricingMethod,
		Shipping:         req.Shipping,
		FirWbv:           req.FirWbv,
		FirPrice:         minFirPrice,
		ContinueWbv:      req.ContinueWbv,
		ContinuePrice:    req.ContinuePrice,
		Contact:          req.Contact,
		PhoneNumber:      req.PhoneNumber,
		FullAddress:      req.FullAddress,
		ShippingRange:    req.ShippingRange,
		WarehouseId:      req.WarehouseId,
		Remark:           req.Remark,
		Status:           req.Status,
		DelFlag:          "0",
		CreateTime:       &now,
		UpdateTime:       &now,
	}

	if logistics.Status == "" {
		logistics.Status = "0"
	}

	if err := databaseConn.Create(&logistics).Error; err != nil {
		return 0, errors.New("创建物流模板失败")
	}

	return logistics.Id, nil
}

// UpdateLogistics 修改物流模板
func (s *LogisticsService) UpdateLogistics(req request.UpdateLogisticsRequest, db ...*gorm.DB) error {
	databaseConn := database.OptionalDB(db...)

	var logistics models.Logistics
	if err := databaseConn.Where("id = ? AND del_flag = ?", req.Id, "0").First(&logistics).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return errors.New("物流模板不存在")
		}
		return errors.New("查询物流模板失败")
	}

	var count int64
	databaseConn.Model(&models.Logistics{}).
		Where("template_name = ? AND id != ? AND del_flag = ?", req.TemplateName, req.Id, "0").
		Count(&count)
	if count > 0 {
		return errors.New("物流模板名称已存在")
	}

	// 计算最小首费
	minFirPrice, err := s.calculateMinFirstFee(req.ShippingRange)
	if err != nil {
		return err
	}

	now := time.Now()
	updates := map[string]interface{}{
		"template_name":     req.TemplateName,
		"delivery_province": req.DeliveryProvince,
		"delivery_city":     req.DeliveryCity,
		"delivery_area":     req.DeliveryArea,
		"delivery_address":  req.DeliveryAddress,
		"pricing_method":    req.PricingMethod,
		"shipping":          req.Shipping,
		"fir_wbv":           req.FirWbv,
		"fir_price":         minFirPrice,
		"continue_wbv":      req.ContinueWbv,
		"continue_price":    req.ContinuePrice,
		"contact":           req.Contact,
		"phone_number":      req.PhoneNumber,
		"full_address":      req.FullAddress,
		"shipping_range":    req.ShippingRange,
		"warehouse_id":      req.WarehouseId,
		"remark":            req.Remark,
		"status":            req.Status,
		"update_time":       &now,
	}

	if err := databaseConn.Model(&logistics).Updates(updates).Error; err != nil {
		return errors.New("更新物流模板失败")
	}

	return nil
}

// DeleteLogistics 删除物流模板
func (s *LogisticsService) DeleteLogistics(id uint64, db ...*gorm.DB) error {
	databaseConn := database.OptionalDB(db...)

	if id == 0 {
		return errors.New("物流模板ID不能为空")
	}

	var logistics models.Logistics
	if err := databaseConn.Where("id = ? AND del_flag = ?", id, "0").First(&logistics).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return errors.New("物流模板不存在")
		}
		return errors.New("查询物流模板失败")
	}

	now := time.Now()
	if err := databaseConn.Model(&logistics).Update("del_flag", "1").Update("update_time", &now).Error; err != nil {
		return errors.New("删除物流模板失败")
	}

	return nil
}