package common

import "C"
import (
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"
	"syscall"
	"unsafe"
)

// ErrorResponse 错误响应结构
type ErrorResponse struct {
	ErrorMsg  string      `json:"error_msg"`  // 错误信息
	SubMsg    string      `json:"sub_msg"`    // 子错误信息
	SubCode   interface{} `json:"sub_code"`   // 使用json.RawMessage处理null和不同类型
	ErrorCode int         `json:"error_code"` // 错误代码
	RequestID string      `json:"request_id"` // 请求ID
}

// ErrorWrapper 最外层错误响应包装
type ErrorWrapper struct {
	ErrorResponse ErrorResponse `json:"error_response"` // 错误响应
}

// GoodsImageUploadResp 商品图片上传响应结构体
type GoodsImageUploadResp struct {
	GoodsImageUploadResponse struct {
		ImageURL  string `json:"image_url"`  // 上传后的图片URL
		RequestID string `json:"request_id"` // 请求ID
	} `json:"goods_image_upload_response"`
}

// PddDLL 拼多多工具DLL结构
type pddDLL struct {
	dll                        *syscall.DLL
	pddGoodsOuterCatMappingGet *syscall.Proc // 类目预测接口
	pddGoodsAdd                *syscall.Proc // 商品新增接口
	pddGoodsAd                 *syscall.Proc // 商品新增接口
	pddGoodsImageUpload        *syscall.Proc // 商品图片上传接口
	freeCString                *syscall.Proc // 释放C字符串
}

// InitPddDLL 初始化pddDLL
func InitPddDLL() (*pddDLL, error) {
	dllPath := filepath.Join("pddTask", "dll", "pdd.dll")
	if _, err := os.Stat(dllPath); os.IsNotExist(err) {
		return nil, fmt.Errorf("pdd DLL 不存在: %s", dllPath)
	}
	if dll, err := syscall.LoadDLL(dllPath); err != nil {
		return nil, fmt.Errorf("加载pdd DLL 失败: %s", err)
	} else {
		return &pddDLL{
			dll:                        dll,
			pddGoodsOuterCatMappingGet: dll.MustFindProc("PddGoodsOuterCatMappingGet"),
			pddGoodsAdd:                dll.MustFindProc("PddGoodsAdd"),
			pddGoodsAd:                 dll.MustFindProc("PddGoodsAd"),
			pddGoodsImageUpload:        dll.MustFindProc("PddGoodsImageUpload"),
			freeCString:                dll.MustFindProc("FreeCString"),
		}, nil
	}
}

// cStr 获取C字符串
func (m *pddDLL) cStr(p uintptr) string {
	if p == 0 {
		return ""
	}
	b := []byte{}
	for i := uintptr(0); ; i++ {
		c := *(*byte)(unsafe.Pointer(p + i))
		if c == 0 {
			break
		}
		b = append(b, c)
	}
	s := string(b)
	if m.freeCString != nil {
		m.freeCString.Call(p)
	}
	return s
}

// PddGoodsAdd 商品新增接口
func PddGoodsAdd(clientId, clientSecret, accessToken, goodsAddJson string) (string, error) {
	dll, err := InitPddDLL()
	if err != nil {
		return "", err
	}

	clientIdPtr, _ := syscall.BytePtrFromString(clientId)
	clientSecretPtr, _ := syscall.BytePtrFromString(clientSecret)
	accessTokenPtr, _ := syscall.BytePtrFromString(accessToken)
	goodsAddJsonPtr, _ := syscall.BytePtrFromString(goodsAddJson)
	info, _, _ := dll.pddGoodsAdd.Call(
		uintptr(unsafe.Pointer(clientIdPtr)),
		uintptr(unsafe.Pointer(clientSecretPtr)),
		uintptr(unsafe.Pointer(accessTokenPtr)),
		uintptr(unsafe.Pointer(goodsAddJsonPtr)),
	)
	result := dll.cStr(info)
	return result, err
}

// PddGoodsImageUpload 商品图片上传接口
func (m *pddDLL) PddGoodsImageUpload(clientId, clientSecret, accessToken, fileBase string) (string, error) {
	proc := m.pddGoodsImageUpload

	clientIdPtr, _ := syscall.BytePtrFromString(clientId)
	clientSecretPtr, _ := syscall.BytePtrFromString(clientSecret)
	accessTokenPtr, _ := syscall.BytePtrFromString(accessToken)
	fileBasePtr, _ := syscall.BytePtrFromString(fileBase)

	info, _, _ := proc.Call(
		uintptr(unsafe.Pointer(clientIdPtr)),
		uintptr(unsafe.Pointer(clientSecretPtr)),
		uintptr(unsafe.Pointer(accessTokenPtr)),
		uintptr(unsafe.Pointer(fileBasePtr)),
	)
	result := m.cStr(info)
	// 解析
	var goodsImageUploadResp GoodsImageUploadResp
	if err := json.Unmarshal([]byte(result), &goodsImageUploadResp); err != nil {
		return "", fmt.Errorf("解析 goodsImageUploadResp JSON失败: %s,响应信息: %s", err, result)
	}
	return goodsImageUploadResp.GoodsImageUploadResponse.ImageURL, nil
}