package service

import (
	"encoding/json"
	"fmt"
	"log"
	"psi/config"
	"psi/database"
	"psi/models"
	"psi/utils"
	"strconv"
	"time"

	"gorm.io/gorm"
)

type WangdianPurchaseInfo struct {
	ProviderNo       string                       `json:"provider_no"`
	WarehouseNo      string                       `json:"warehouse_no"`
	OuterNo          string                       `json:"outer_no"`
	IsUseOuterNo     int8                         `json:"is_use_outer_no,omitempty"`
	IsCheck          int8                         `json:"is_check,omitempty"`
	Contact          string                       `json:"contact,omitempty"`
	PurchaseName     string                       `json:"purchase_name,omitempty"`
	Telno            string                       `json:"telno,omitempty"`
	ReceiveAddress   string                       `json:"receive_address,omitempty"`
	LogisticsType    int8                         `json:"logistics_type,omitempty"` // 暂未使用 运货方式（物流公司）
	ExpectArriveTime string                       `json:"expect_arrive_time,omitempty"`
	Remark           string                       `json:"remark,omitempty"`
	OtherFee         float64                      `json:"other_fee,omitempty"` // 暂未使用 其他费用
	PostFee          float64                      `json:"post_fee,omitempty"`  // 暂未使用 邮资
	Prop1            string                       `json:"prop1,omitempty"`     // 暂未使用 自定义属性1
	Prop2            string                       `json:"prop2,omitempty"`     // 暂未使用 自定义属性2
	DetailsList      []WangdianPurchaseDetailItem `json:"details_list"`
}

type WangdianPurchaseDetailItem struct {
	SpecNo    string  `json:"spec_no"`
	Num       float64 `json:"num"`
	Price     float64 `json:"price"`
	Discount  float64 `json:"discount,omitempty"`
	Tax       float64 `json:"tax,omitempty"`        //暂未使用 税率
	TaxPrice  float64 `json:"tax_price,omitempty"`  //暂未使用 税后单价
	TaxAmount float64 `json:"tax_amount,omitempty"` //暂未使用 税后金额
	Remark    string  `json:"remark,omitempty"`
	Prop1     string  `json:"prop1,omitempty"` // 暂未使用 自定义属性1
	Prop2     string  `json:"prop2,omitempty"` // 暂未使用 自定义属性2

}

type WangdianPurchasePushResponse struct {
	Code    int    `json:"code"`
	Message string `json:"message"`
}

func PushPurchaseOrder(purchaseOrderID int64, db ...*gorm.DB) (*WangdianPurchasePushResponse, error) {
	databaseConn := database.OptionalDB(db...)

	dbName := databaseConn.Migrator().CurrentDatabase()
	log.Printf("[旺店通推送] 使用数据库: %s", dbName)

	// 1. 查询采购单
	var po models.PurchaseOrder
	if err := databaseConn.Where("id = ? AND is_del = 0", purchaseOrderID).First(&po).Error; err != nil {
		return nil, fmt.Errorf("采购单不存在: %v", err)
	}

	// 2. 查询供应商编号（必须）
	var supplier models.Supplier
	if err := databaseConn.Select("code, contact_person, contact_phone, address").
		Where("id = ? AND is_del = 0", po.SupplierID).First(&supplier).Error; err != nil {
		return nil, fmt.Errorf("获取供应商信息失败: %v", err)
	}
	if supplier.Code == "" {
		return nil, fmt.Errorf("供应商编码为空,请先维护供应商档案")
	}

	// 3. 查询仓库编号（必须）
	var warehouse models.Warehouse
	if err := databaseConn.Select("code, contact_person, contact_phone, address").
		Where("id = ? AND is_del = 0", po.WarehouseID).First(&warehouse).Error; err != nil {
		return nil, fmt.Errorf("获取仓库信息失败: %v", err)
	}
	if warehouse.Code == "" {
		return nil, fmt.Errorf("仓库编码为空,请先维护仓库档案")
	}

	// 4. 查询采购明细，关联商品条码
	type itemRow struct {
		models.PurchaseOrderItem
		Barcode string `gorm:"column:barcode"`
	}
	var items []itemRow
	if err := databaseConn.Table("purchase_order_item").
		Select("purchase_order_item.*, product.barcode").
		Joins("LEFT JOIN product ON purchase_order_item.product_id = product.id AND product.is_del = 0").
		Where("purchase_order_item.purchase_order_id = ? AND purchase_order_item.is_del = 0", purchaseOrderID).
		Debug().Scan(&items).Error; err != nil {
		return nil, fmt.Errorf("获取采购明细失败: %v", err)
	}
	if len(items) == 0 {
		return nil, fmt.Errorf("采购明细为空,无法推送")
	}

	// 5. 组装 details_list
	detailList := make([]WangdianPurchaseDetailItem, 0, len(items))
	for _, it := range items {
		specNo := it.Barcode
		if specNo == "" {
			specNo = strconv.FormatInt(it.ProductID, 10)
		}
		detailList = append(detailList, WangdianPurchaseDetailItem{
			SpecNo:   specNo,
			Num:      float64(it.Quantity),
			Price:    float64(it.UnitPrice) / 100.0,
			Discount: 1.0,
		})
	}

	// 6. 组装 purchase_info
	info := WangdianPurchaseInfo{
		ProviderNo:     supplier.Code,
		WarehouseNo:    warehouse.Code,
		OuterNo:        po.PoNo,
		IsUseOuterNo:   0,
		IsCheck:        0,
		Contact:        warehouse.ContactPerson,
		PurchaseName:   warehouse.ContactPerson,
		Telno:          warehouse.ContactPhone,
		ReceiveAddress: warehouse.Address,
		Remark:         po.Remark,
		DetailsList:    detailList,
	}
	if po.ExpectedArrivalDate > 0 {
		info.ExpectArriveTime = time.Unix(po.ExpectedArrivalDate, 0).Format("2006-01-02 15:04:05")
	}

	infoBytes, err := json.Marshal(info)
	if err != nil {
		return nil, fmt.Errorf("序列化采购信息失败: %v", err)
	}

	// 7. 校验配置
	cfg := config.AppConfig.Wangdian
	if cfg.Sid == "" || cfg.AppKey == "" || cfg.AppSecret == "" {
		return nil, fmt.Errorf("旺店通接口配置不完整(sid/appkey/appsecret)")
	}

	// 8. 组装公共请求参数 + 计算签名
	timestamp := time.Now().Unix()
	params := map[string]string{
		"sid":           cfg.Sid,
		"appkey":        cfg.AppKey,
		"timestamp":     strconv.FormatInt(timestamp, 10),
		"purchase_info": string(infoBytes),
	}
	params["sign"] = utils.WangdianSign(params, cfg.AppSecret)

	// 9. 提交请求
	url := cfg.URL
	if cfg.Sandbox && cfg.SandboxURL != "" {
		url = cfg.SandboxURL
	}
	if url == "" {
		url = "https://api.wangdian.cn/openapi2/purchase_order_push.php"
	}
	timeout := cfg.Timeout
	if timeout <= 0 {
		timeout = 30
	}

	log.Printf("[旺店通推送] 请求URL: %s (sandbox=%v, form-urlencoded), 参数: sid=%s appkey=%s timestamp=%s sign=%s", url, cfg.Sandbox, cfg.Sid, cfg.AppKey, params["timestamp"], params["sign"])
	log.Printf("[旺店通推送] purchase_info: %s", string(infoBytes))

	respBody, err := utils.SubmitFormDataWithTimeout(url, params, timeout)
	if err != nil {
		return nil, fmt.Errorf("推送请求失败: %v", err)
	}

	log.Printf("[旺店通推送] 返回信息: %s", string(respBody))

	var resp WangdianPurchasePushResponse
	if err := json.Unmarshal([]byte(respBody), &resp); err != nil {
		return nil, fmt.Errorf("解析响应失败(raw=%s): %v", respBody, err)
	}
	return &resp, nil
}