package sdk_LinkedMall

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strconv"
	"strings"

	openapi "github.com/alibabacloud-go/darabonba-openapi/v2/client"
	"github.com/alibabacloud-go/tea/v2"
)

const (
	defaultRegionId = "cn-zhangjiakou"
	defaultEndpoint = "linkedmall.cn-zhangjiakou.aliyuncs.com"
	basePath        = "/opensaas-s2b/opensaas-s2b-biz-trade/v2"
	readTimeout     = 30000
	connectTimeout  = 10000
)

// Client LinkedMall SDK 客户端
type Client struct {
	inner *openapi.Client
}

// NewClient 创建一个新的LinkedMall SDK客户端
//
// 使用RAM子账号的AccessKey初始化，禁止使用主账号AK。
// 示例：
//
//	cli, err := NewClient("your-access-key-id", "your-access-key-secret")
//	if err != nil {
//	    panic(err)
//	}
func NewClient(accessKeyId, accessKeySecret string) (*Client, error) {
	config := &openapi.Config{
		AccessKeyId:     tea.String(accessKeyId),
		AccessKeySecret: tea.String(accessKeySecret),
		RegionId:        tea.String(defaultRegionId),
		Endpoint:        tea.String(defaultEndpoint),
		ReadTimeout:     tea.Int(readTimeout),
		ConnectTimeout:  tea.Int(connectTimeout),
	}
	c, err := openapi.NewClient(config)
	if err != nil {
		return nil, fmt.Errorf("failed to create openapi client: %w", err)
	}
	return &Client{inner: c}, nil
}

// buildPath 构建完整的请求路径
func buildPath(suffix string) string {
	return basePath + suffix
}

// toQueryMap 将结构体转为查询参数map
func toQueryMap(params interface{}) map[string]*string {
	result := make(map[string]*string)
	if params == nil {
		return result
	}

	// 使用json标签序列化后转为map
	data, _ := json.Marshal(params)
	var rawMap map[string]interface{}
	if err := json.Unmarshal(data, &rawMap); err != nil {
		return result
	}

	for k, v := range rawMap {
		switch val := v.(type) {
		case string:
			if val != "" {
				result[k] = tea.String(val)
			}
		case float64:
			if val != 0 {
				result[k] = tea.String(strconv.FormatInt(int64(val), 10))
			}
		case bool:
			result[k] = tea.String(strconv.FormatBool(val))
		default:
			// 忽略复杂类型
		}
	}
	return result
}

// doRequest 执行HTTP请求并返回响应体字节
func (c *Client) doRequest(method, path string, query map[string]*string, body interface{}) ([]byte, error) {
	resp, err := c.inner.RoaRequest(
		tea.String(method),
		tea.String(path),
		query,
		body,
		nil,
	)
	if err != nil {
		return nil, fmt.Errorf("roa request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		bodyBytes, _ := io.ReadAll(resp.Body)
		return nil, fmt.Errorf("unexpected http status %d, body: %s", resp.StatusCode, string(bodyBytes))
	}

	return io.ReadAll(resp.Body)
}

// parseResponse 解析通用响应，如果业务失败返回 *APIError
func (c *Client) parseResponse(data []byte, target interface{}) error {
	var commonResp CommonResponse
	if err := json.Unmarshal(data, &commonResp); err != nil {
		return fmt.Errorf("failed to parse common response: %w, body: %s", err, string(data))
	}

	if !commonResp.Success {
		return &APIError{
			Code:       commonResp.Code,
			Message:    commonResp.Message,
			SubCode:    commonResp.SubCode,
			SubMessage: commonResp.SubMessage,
			RequestId:  commonResp.RequestId,
		}
	}

	if target != nil && len(commonResp.Data) > 0 {
		if err := json.Unmarshal(commonResp.Data, target); err != nil {
			return fmt.Errorf("failed to parse data field: %w, data: %s", err, string(commonResp.Data))
		}
	}
	return nil
}

// ============================================================
// 采购方店铺 (Purchaser Shop)
// ============================================================

// ListPurchaserShops 分页获取采购方店铺列表
func (c *Client) ListPurchaserShops(req *ListPurchaserShopsReq) (*ListPurchaserShopsRespData, error) {
	path := buildPath("/purchaser-shops")
	query := toQueryMap(req)

	data, err := c.doRequest("GET", path, query, nil)
	if err != nil {
		return nil, err
	}

	var result ListPurchaserShopsRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// GetPurchaserShop 获取单个采购店铺详情
func (c *Client) GetPurchaserShop(shopId string) (*GetPurchaserShopRespData, error) {
	path := buildPath("/purchaser-shops/" + shopId)

	data, err := c.doRequest("GET", path, nil, nil)
	if err != nil {
		return nil, err
	}

	var result GetPurchaserShopRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// ============================================================
// 选品池商品 (Selection Product)
// ============================================================

// ListSelectionProducts 分页查询选品池商品列表
func (c *Client) ListSelectionProducts(req *ListSelectionProductsReq) (*ListSelectionProductsRespData, error) {
	path := buildPath("/selection-products")
	query := toQueryMap(req)

	data, err := c.doRequest("GET", path, query, nil)
	if err != nil {
		return nil, err
	}

	var result ListSelectionProductsRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// GetSelectionProduct 查询选品池商品详情
//
// divisionCode 为可选参数，传入五级乡镇区域编码后可返回该区域可售状态和库存。
func (c *Client) GetSelectionProduct(productId, purchaserId, divisionCode string) (*GetSelectionProductRespData, error) {
	path := buildPath("/selection-products/" + productId)
	query := map[string]*string{
		"PurchaserId": tea.String(purchaserId),
	}
	if divisionCode != "" {
		query["DivisionCode"] = tea.String(divisionCode)
	}

	data, err := c.doRequest("GET", path, query, nil)
	if err != nil {
		return nil, err
	}

	var result GetSelectionProductRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// GetSelectionProductSaleInfo 查询选品池商品销售信息
func (c *Client) GetSelectionProductSaleInfo(productId, purchaserId, divisionCode string) (*GetSelectionProductSaleInfoRespData, error) {
	path := buildPath("/selection-products/" + productId + "/sale-info")
	query := map[string]*string{
		"PurchaserId": tea.String(purchaserId),
	}
	if divisionCode != "" {
		query["DivisionCode"] = tea.String(divisionCode)
	}

	data, err := c.doRequest("GET", path, query, nil)
	if err != nil {
		return nil, err
	}

	var result GetSelectionProductSaleInfoRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// ListSelectionProductSaleInfos 批量查询商品销售信息
func (c *Client) ListSelectionProductSaleInfos(req *ListSelectionProductSaleInfosReq) (*ListSelectionProductSaleInfosRespData, error) {
	path := buildPath("/selection-products:batch-sale-info")

	data, err := c.doRequest("POST", path, nil, req)
	if err != nil {
		return nil, err
	}

	var result ListSelectionProductSaleInfosRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// ListSelectionSkuSaleInfos 批量查询SKU销售信息
func (c *Client) ListSelectionSkuSaleInfos(req *ListSelectionSkuSaleInfosReq) (*ListSelectionSkuSaleInfosRespData, error) {
	path := buildPath("/selection-skus:batch-sale-info")

	data, err := c.doRequest("POST", path, nil, req)
	if err != nil {
		return nil, err
	}

	var result ListSelectionSkuSaleInfosRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// ListCategories 查询类目列表
func (c *Client) ListCategories(req *ListCategoriesReq) (*ListCategoriesRespData, error) {
	path := buildPath("/categories")
	query := toQueryMap(req)

	data, err := c.doRequest("GET", path, query, nil)
	if err != nil {
		return nil, err
	}

	var result ListCategoriesRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// SearchProducts 搜索选品池商品
func (c *Client) SearchProducts(req *SearchProductsReq) (*SearchProductsRespData, error) {
	path := buildPath("/selection-products:search")

	data, err := c.doRequest("POST", path, nil, req)
	if err != nil {
		return nil, err
	}

	var result SearchProductsRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// ============================================================
// 选品池入库/出库
// ============================================================

// SelectionGroupAddProduct 选品池商品入库
func (c *Client) SelectionGroupAddProduct(req *SelectionGroupAddProductReq) (*OperationRespData, error) {
	path := buildPath("/selection-group/products:add")

	data, err := c.doRequest("POST", path, nil, req)
	if err != nil {
		return nil, err
	}

	var result OperationRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// SelectionGroupRemoveProduct 选品池商品出库
func (c *Client) SelectionGroupRemoveProduct(req *SelectionGroupRemoveProductReq) (*OperationRespData, error) {
	path := buildPath("/selection-group/products:remove")

	data, err := c.doRequest("POST", path, nil, req)
	if err != nil {
		return nil, err
	}

	var result OperationRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// ============================================================
// 采购单 (Purchase Order)
// ============================================================

// RenderPurchaseOrder 采购单渲染（下单预校验）
//
// 下单前必须调用，获取实时价格、校验商品是否可售。
func (c *Client) RenderPurchaseOrder(req *RenderPurchaseOrderReq) (*RenderPurchaseOrderRespData, error) {
	path := buildPath("/purchase-orders:render")

	data, err := c.doRequest("POST", path, nil, req)
	if err != nil {
		return nil, err
	}

	var result RenderPurchaseOrderRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// SplitPurchaseOrder 采购单渲染并拆单
//
// 返回拆成多份子单结构，用于前端展示，拆单结果用于创建采购单入参。
func (c *Client) SplitPurchaseOrder(req *SplitPurchaseOrderReq) (*SplitPurchaseOrderRespData, error) {
	path := buildPath("/purchase-orders:split-render")

	data, err := c.doRequest("POST", path, nil, req)
	if err != nil {
		return nil, err
	}

	var result SplitPurchaseOrderRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// CreatePurchaseOrder 创建采购单【异步】
//
// 重要：接口只返回采购单号，不代表下单成功，必须等待回调通知，再查询订单接口。
// 禁止在同步返回后直接标记本地订单成功。
func (c *Client) CreatePurchaseOrder(req *CreatePurchaseOrderReq) (*CreatePurchaseOrderRespData, error) {
	path := buildPath("/purchase-orders")

	data, err := c.doRequest("POST", path, nil, req)
	if err != nil {
		return nil, err
	}

	var result CreatePurchaseOrderRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// GetPurchaseOrderStatus 获取采购单状态
//
// 状态枚举：INIT（初始化）、PROCESS（处理中）、SUCCESS（成功）、FAIL（失败）、CLOSED（已关闭）
func (c *Client) GetPurchaseOrderStatus(purchaseOrderId, purchaserId string) (*GetPurchaseOrderStatusRespData, error) {
	path := buildPath("/purchase-orders/" + purchaseOrderId + "/status")
	query := map[string]*string{
		"PurchaserId": tea.String(purchaserId),
	}

	data, err := c.doRequest("GET", path, query, nil)
	if err != nil {
		return nil, err
	}

	var result GetPurchaseOrderStatusRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// ============================================================
// 订单 (Order)
// ============================================================

// GetOrder 获取订单详情
func (c *Client) GetOrder(orderId, purchaserId string) (*GetOrderRespData, error) {
	path := buildPath("/orders/" + orderId)
	query := map[string]*string{
		"PurchaserId": tea.String(purchaserId),
	}

	data, err := c.doRequest("GET", path, query, nil)
	if err != nil {
		return nil, err
	}

	var result GetOrderRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// QueryOrders 查询订单列表
func (c *Client) QueryOrders(req *QueryOrdersReq) (*QueryOrdersRespData, error) {
	path := buildPath("/orders")
	query := toQueryMap(req)

	data, err := c.doRequest("GET", path, query, nil)
	if err != nil {
		return nil, err
	}

	var result QueryOrdersRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// ListLogisticsOrders 查询订单物流信息
func (c *Client) ListLogisticsOrders(orderId, purchaserId string) (*ListLogisticsOrdersRespData, error) {
	path := buildPath("/orders/" + orderId + "/logistics")
	query := map[string]*string{
		"PurchaserId": tea.String(purchaserId),
	}

	data, err := c.doRequest("GET", path, query, nil)
	if err != nil {
		return nil, err
	}

	var result ListLogisticsOrdersRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// ConfirmDisburse 确认收货
func (c *Client) ConfirmDisburse(orderId, purchaserId string) (*OperationRespData, error) {
	path := buildPath("/orders/" + orderId + ":confirm-disburse")
	body := map[string]*string{
		"PurchaserId": tea.String(purchaserId),
	}

	data, err := c.doRequest("POST", path, nil, body)
	if err != nil {
		return nil, err
	}

	var result OperationRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// ============================================================
// 售后单 (Refund Order)
// ============================================================

// RenderRefundOrder 售后渲染预校验
func (c *Client) RenderRefundOrder(req *RenderRefundOrderReq) (*RenderRefundOrderRespData, error) {
	path := buildPath("/refund-orders:render")

	data, err := c.doRequest("POST", path, nil, req)
	if err != nil {
		return nil, err
	}

	var result RenderRefundOrderRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// CreateRefundOrder 创建售后单
func (c *Client) CreateRefundOrder(req *CreateRefundOrderReq) (*CreateRefundOrderRespData, error) {
	path := buildPath("/refund-orders")

	data, err := c.doRequest("POST", path, nil, req)
	if err != nil {
		return nil, err
	}

	var result CreateRefundOrderRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// CancelRefundOrder 取消售后单
func (c *Client) CancelRefundOrder(refundOrderId, purchaserId string) (*CancelRefundOrderRespData, error) {
	path := buildPath("/refund-orders/" + refundOrderId + ":cancel")
	body := map[string]*string{
		"PurchaserId": tea.String(purchaserId),
	}

	data, err := c.doRequest("POST", path, nil, body)
	if err != nil {
		return nil, err
	}

	var result CancelRefundOrderRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// GetRefundOrder 获取售后单详情
func (c *Client) GetRefundOrder(refundOrderId, purchaserId string) (*GetRefundOrderRespData, error) {
	path := buildPath("/refund-orders/" + refundOrderId)
	query := map[string]*string{
		"PurchaserId": tea.String(purchaserId),
	}

	data, err := c.doRequest("GET", path, query, nil)
	if err != nil {
		return nil, err
	}

	var result GetRefundOrderRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// CreateGoodsShippingNotice 回填退货物流运单
func (c *Client) CreateGoodsShippingNotice(refundOrderId string, req *CreateGoodsShippingNoticeReq) (*CreateGoodsShippingNoticeRespData, error) {
	path := buildPath("/refund-orders/" + refundOrderId + ":fill-logistics")

	data, err := c.doRequest("POST", path, nil, req)
	if err != nil {
		return nil, err
	}

	var result CreateGoodsShippingNoticeRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// ============================================================
// 区域编码 (Division Code)
// ============================================================

// QueryChildDivisionCode 查询子区域编码
//
// 不传ParentDivisionCode返回省级编码；
// 传入省返回市，传入市返回区，传入区返回乡镇（五级）。
// 下单、商品可售校验必须拿到乡镇级DivisionCode。
func (c *Client) QueryChildDivisionCode(parentDivisionCode string) (*QueryChildDivisionCodeRespData, error) {
	path := buildPath("/divisions:children")
	var query map[string]*string
	if parentDivisionCode != "" {
		query = map[string]*string{
			"ParentDivisionCode": tea.String(parentDivisionCode),
		}
	}

	data, err := c.doRequest("GET", path, query, nil)
	if err != nil {
		return nil, err
	}

	var result QueryChildDivisionCodeRespData
	if err := c.parseResponse(data, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

// ============================================================
// 回调解析工具
// ============================================================

// CallbackEvent 回调通知事件结构体
type CallbackEvent struct {
	EventCode       string   `json:"EventCode"`       // 事件类型
	PurchaseOrderId string   `json:"PurchaseOrderId"` // 采购单ID
	OrderIdList     []string `json:"OrderIdList"`     // 附属真实订单ID数组
	Status          string   `json:"Status"`          // 状态
	RequestId       string   `json:"RequestId"`       // 请求ID
}

// ParseCallbackEvent 解析回调通知的JSON Body
//
// 业务侧在回调接口中接收阿里云POST请求，解析事件后做本地状态同步。
// 处理完成后需返回 {"success":true} 告知阿里云消费成功。
func ParseCallbackEvent(body []byte) (*CallbackEvent, error) {
	var event CallbackEvent
	if err := json.Unmarshal(body, &event); err != nil {
		return nil, fmt.Errorf("failed to parse callback event: %w", err)
	}
	return &event, nil
}

// CallbackSuccessResponse 回调成功响应
//
// 业务处理完回调事件后，返回此结构告知阿里云消费成功。
func CallbackSuccessResponse() string {
	return `{"success":true}`
}

// IsAPIError 判断错误是否为指定错误码
func IsAPIError(err error, code string) bool {
	if apiErr, ok := err.(*APIError); ok {
		return apiErr.Code == code
	}
	return false
}

// ============================================================
// 辅助函数
// ============================================================

// ToQueryString 将结构体转为URL查询字符串（仅用于调试）
func ToQueryString(params interface{}) string {
	query := toQueryMap(params)
	if len(query) == 0 {
		return ""
	}
	var parts []string
	for k, v := range query {
		if v != nil {
			parts = append(parts, k+"="+*v)
		}
	}
	return strings.Join(parts, "&")
}