package t3_union

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"math/rand"
	"net/http"
	"sort"
	"strings"
	"time"

	"github.com/zeromicro/go-zero/core/logx"

	"gitee.com/chengdu-lenntc/third-platform-sdk/client"
	"gitee.com/chengdu-lenntc/third-platform-sdk/util"
)

// T3UnionApi 调用第三方平台的api
// Api defines the interface of t3_union api
type T3UnionApi interface {
	// Sign 签名
	Sign(methodType string, url string, data map[string]interface{}) string
	// GenerateLink 生成短链
	GenerateLink(ctx context.Context, req GenerateLinkRequest) (*GenerateLinkData, error)
	// GenerateCode 生成二维码
	GenerateCode(ctx context.Context, req GenerateCodeRequest) (*GenerateCodeData, error)
	// GeneratePoster 生成推广海报
	GeneratePoster(ctx context.Context, req GeneratePosterRequest) (*GeneratePosterData, error)
	// QueryOrderList 查询订单列表
	QueryOrderList(ctx context.Context, req QueryOrderListRequest) (*QueryOrderData, error)
}

type t3UnionApiImpl struct {
	log    logx.Logger
	client *Client
}

func newT3UnionApiImpl(log logx.Logger, client *Client) T3UnionApi {
	return &t3UnionApiImpl{
		log:    log,
		client: client,
	}
}

func (a *t3UnionApiImpl) buildHeader(methodType string, uri string, data map[string]any) map[string]string {
	// 随机数
	tn := time.Now()
	src := rand.NewSource(tn.Unix())
	randNum := rand.New(src).Int31n(10000)
	nonce := util.Md5String(fmt.Sprintf("%d_nonce_%d", tn.UnixMicro(), randNum))
	headers := map[string]string{
		XT3Nonce:           nonce,                                     // 请求标识，10分钟内保证唯一性
		XT3Timestamp:       fmt.Sprintf("%d", time.Now().UnixMilli()), // 请求发起时间戳(毫秒)，有效时1分钟
		XT3Version:         "V1",                                      // 版本（固定值传"V1"）
		XT3Key:             a.client.authConfig.AppKey,                // 使用前联系分配账号（APP Key）
		XT3SignatureMethod: "MD5",                                     // 固定值传 "MD5"
	}

	headers[XT3Signature] = a.getSign(methodType, uri, headers, data)                                      // 在获得签名后赋值
	headers[XT3SignatureHeaders] = "x-t3-nonce,x-t3-timestamp,x-t3-version,x-t3-key,x-t3-signature-method" // 固定传值

	return headers
}

func (a *t3UnionApiImpl) getSign(methodType string, uri string, headers map[string]string, data map[string]any) string {
	// key排序
	arr := sort.StringSlice{}
	for k := range headers {
		if k != XT3Signature && k != XT3SignatureHeaders {
			arr = append(arr, k)
		}
	}
	arr.Sort()
	// 参数拼接
	var build strings.Builder
	build.WriteString(fmt.Sprintf("%s%s", methodType, uri))
	for _, k := range arr {
		build.WriteString(fmt.Sprintf("%s:%v", k, headers[k]))
	}
	// 请求参数body转json string后用MD5进行加密
	dataByte, _ := json.Marshal(data)
	build.WriteString(util.Md5String(string(dataByte)))
	build.WriteString(a.client.authConfig.AppSecret)
	return util.Md5String(build.String())
}

// Sign 签名
func (a *t3UnionApiImpl) Sign(methodType string, uri string, dataMap map[string]any) string {
	headers := a.buildHeader(methodType, uri, dataMap)
	if sign, ok := headers[XT3Signature]; ok {
		return sign
	}
	return ""
}

// GenerateLink 生成短链
func (a *t3UnionApiImpl) GenerateLink(ctx context.Context, req GenerateLinkRequest) (*GenerateLinkData, error) {
	args := util.StructToMap(req)
	headers := a.buildHeader(http.MethodPost, GetLinkUri, args)
	for k, v := range a.client.headers {
		headers[k] = v
	}
	request := &client.HttpRequest{Headers: headers, BodyArgs: args}
	response := new(GenerateLinkResponse)
	if err := a.client.HttpPost(GetLinkUrl, request, &client.HttpResponse{Result: response}); err != nil {
		return nil, err
	}
	if !response.Success || response.ErrCode != 0 {
		a.log.WithFields(logx.LogField{Key: "data", Value: map[string]any{"req": req, "resp": response}}).
			Errorf("[t3UnionApiImpl][GenerateLink] response result error: %s", response.Msg)
		return nil, errors.New(response.Msg)
	}
	return response.Data, nil
}

// GenerateCode 生成二维码
func (a *t3UnionApiImpl) GenerateCode(ctx context.Context, req GenerateCodeRequest) (*GenerateCodeData, error) {
	args := util.StructToMap(req)
	headers := a.buildHeader(http.MethodPost, GetMiniCodeUri, args)
	for k, v := range a.client.headers {
		headers[k] = v
	}
	request := &client.HttpRequest{Headers: headers, BodyArgs: args}
	response := new(GenerateCodeResponse)
	if err := a.client.HttpPost(GetMiniCodeUrl, request, &client.HttpResponse{Result: response}); err != nil {
		return nil, err
	}
	if !response.Success || response.ErrCode != 0 {
		a.log.WithFields(logx.LogField{Key: "data", Value: map[string]any{"req": req, "resp": response}}).
			Errorf("[t3UnionApiImpl][GenerateLink] response result error: %s", response.Msg)
		return nil, errors.New(response.Msg)
	}
	return response.Data, nil
}

// GeneratePoster 生成推广海报
func (a *t3UnionApiImpl) GeneratePoster(ctx context.Context, req GeneratePosterRequest) (*GeneratePosterData, error) {
	args := util.StructToMap(req)
	headers := a.buildHeader(http.MethodPost, GetPosterUri, args)
	for k, v := range a.client.headers {
		headers[k] = v
	}
	request := &client.HttpRequest{Headers: headers, BodyArgs: args}
	response := new(GeneratePosterResponse)
	if err := a.client.HttpPost(GetPosterUrl, request, &client.HttpResponse{Result: response}); err != nil {
		return nil, err
	}
	if !response.Success || response.ErrCode != 0 {
		a.log.WithFields(logx.LogField{Key: "data", Value: map[string]any{"req": req, "resp": response}}).
			Errorf("[t3UnionApiImpl][GenerateLink] response result error: %s", response.Msg)
		return nil, errors.New(response.Msg)
	}
	return response.Data, nil
}

// QueryOrderList 查询订单列表
func (a *t3UnionApiImpl) QueryOrderList(ctx context.Context, req QueryOrderListRequest) (*QueryOrderData, error) {
	args := util.StructToMap(req)
	headers := a.buildHeader(http.MethodPost, GetOrderListUri, args)
	for k, v := range a.client.headers {
		headers[k] = v
	}
	request := &client.HttpRequest{Headers: headers, BodyArgs: args}
	response := new(QueryOrderListResponse)
	if err := a.client.HttpPost(GetOrderListUrl, request, &client.HttpResponse{Result: response}); err != nil {
		return nil, err
	}
	if !response.Success || response.ErrCode != 0 {
		a.log.WithFields(logx.LogField{Key: "data", Value: map[string]any{"req": req, "resp": response}}).
			Errorf("[t3UnionApiImpl][GenerateLink] response result error: %s", response.Msg)
		return nil, errors.New(response.Msg)
	}
	return response.Data, nil
}