package service

import (
	"context"
	"errors"
	"fmt"
	"net/http"
	"net/url"
	"os"
	"strings"

	"github.com/QuantumNous/new-api/common"
	"github.com/QuantumNous/new-api/model"
	cmerrs "gitlab.ecloud.com/ecloud/ecloudsdkcore/errs"
	cmmodel "gitlab.ecloud.com/ecloud/ecloudsdkmaas/model"
)

const defaultChinaMobileAssetBaseURL = "https://ecloud.10086.cn"
const defaultChinaMobileAssetPoolID = "CIDC-CORE-00"
const chinaMobileAssetAKEnv = "CHINAMOBILE_ASSET_AK"
const chinaMobileAssetSKEnv = "CHINAMOBILE_ASSET_SK"
const chinaMobileAssetPoolIDEnv = "CHINAMOBILE_ASSET_POOL_ID"

type ChinaMobileAssetAdapter struct {
	newClient func(credential chinaMobileAssetCredential) chinaMobileAssetSDKClient
}

func NewChinaMobileAssetAdapter() AssetAdapter {
	return &ChinaMobileAssetAdapter{newClient: newChinaMobileAssetSDKClient}
}

func (a *ChinaMobileAssetAdapter) Name() string {
	return "chinamobile_asset"
}

func (a *ChinaMobileAssetAdapter) Supports(operation AssetOperation) bool {
	switch operation {
	case AssetOperationAssetCreate,
		AssetOperationAssetList,
		AssetOperationAssetGet,
		AssetOperationAssetUpdate,
		AssetOperationAssetDelete,
		AssetOperationAssetGroupCreate,
		AssetOperationAssetGroupList,
		AssetOperationAssetGroupGet,
		AssetOperationAssetGroupUpdate,
		AssetOperationAssetGroupDelete:
		return true
	default:
		return false
	}
}

func (a *ChinaMobileAssetAdapter) DoAssetRequest(ctx context.Context, channel *model.Channel, req AssetRequest) (*AssetUpstreamResponse, *AssetError) {
	if !a.Supports(req.Action.Operation) {
		return nil, newAssetError(AssetErrorOperationNotSupported, fmt.Sprintf("asset operation %s is not supported", req.Action.Operation), http.StatusBadRequest)
	}
	if err := validateChinaMobileCompatibility(req.Body); err != nil {
		return nil, err
	}
	if err := validateChinaMobileAssetRequest(req); err != nil {
		return nil, err
	}

	credential, err := chinaMobileAssetCredentialFromEnv()
	if err != nil {
		return nil, newAssetError(AssetErrorInvalidRequest, err.Error(), http.StatusBadRequest)
	}
	newClient := a.newClient
	if newClient == nil {
		newClient = newChinaMobileAssetSDKClient
	}
	result, err := callChinaMobileAssetSDK(ctx, newClient(credential), req)
	if err != nil {
		if assetErr := classifyChinaMobileAssetSDKError(err); assetErr != nil {
			return nil, assetErr
		}
		return nil, newAssetError(AssetErrorUpstream, err.Error(), http.StatusBadGateway)
	}
	normalized, assetErr := normalizeChinaMobileAssetSDKResponse(req.Action, req.Version, result)
	if assetErr != nil {
		return nil, assetErr
	}
	return &AssetUpstreamResponse{StatusCode: http.StatusOK, Header: http.Header{}, Body: normalized}, nil
}

func joinChinaMobileAssetURL(baseURL string, path string) (string, error) {
	u, err := url.Parse(baseURL)
	if err != nil {
		return "", err
	}
	u.Path = strings.TrimRight(u.Path, "/") + path
	u.RawQuery = ""
	u.Fragment = ""
	return u.String(), nil
}

type chinaMobileAssetCredential struct {
	AK     string `json:"ak"`
	SK     string `json:"sk"`
	PoolID string `json:"pool_id"`
}

func chinaMobileAssetCredentialFromEnv() (chinaMobileAssetCredential, error) {
	return normalizeChinaMobileAssetCredential(chinaMobileAssetCredential{
		AK:     os.Getenv(chinaMobileAssetAKEnv),
		SK:     os.Getenv(chinaMobileAssetSKEnv),
		PoolID: os.Getenv(chinaMobileAssetPoolIDEnv),
	})
}

func normalizeChinaMobileAssetCredential(credential chinaMobileAssetCredential) (chinaMobileAssetCredential, error) {
	credential.AK = strings.TrimSpace(credential.AK)
	credential.SK = strings.TrimSpace(credential.SK)
	credential.PoolID = strings.TrimSpace(credential.PoolID)
	if credential.AK == "" || credential.SK == "" {
		return chinaMobileAssetCredential{}, fmt.Errorf("%s and %s are required for China Mobile asset library", chinaMobileAssetAKEnv, chinaMobileAssetSKEnv)
	}
	if credential.PoolID == "" {
		credential.PoolID = defaultChinaMobileAssetPoolID
	}
	return credential, nil
}

func callChinaMobileAssetSDK(ctx context.Context, client chinaMobileAssetSDKClient, req AssetRequest) (any, error) {
	type sdkResult struct {
		value any
		err   error
	}
	resultCh := make(chan sdkResult, 1)
	go func() {
		value, err := executeChinaMobileAssetSDK(client, req)
		resultCh <- sdkResult{value: value, err: err}
	}()
	select {
	case <-ctx.Done():
		return nil, ctx.Err()
	case result := <-resultCh:
		return result.value, result.err
	}
}

func executeChinaMobileAssetSDK(client chinaMobileAssetSDKClient, req AssetRequest) (any, error) {
	switch req.Action.Operation {
	case AssetOperationAssetCreate:
		return client.CreateAsset(&cmmodel.CreateAssetRequest{CreateAssetBody: newChinaMobileCreateAssetBody(req.Body)})
	case AssetOperationAssetList:
		return client.ListAssets(&cmmodel.ListAssetsRequest{ListAssetsBody: newChinaMobileListAssetsBody(req.Body)})
	case AssetOperationAssetGet:
		id, err := requiredAssetString(req.Body, "Id")
		if err != nil {
			return nil, err
		}
		return client.GetAsset(&cmmodel.GetAssetRequest{GetAssetPath: (&cmmodel.GetAssetPath{}).SetAssetId(id)})
	case AssetOperationAssetUpdate:
		id, err := requiredAssetString(req.Body, "Id")
		if err != nil {
			return nil, err
		}
		return client.UpdateAsset(&cmmodel.UpdateAssetRequest{
			UpdateAssetPath: (&cmmodel.UpdateAssetPath{}).SetAssetId(id),
			UpdateAssetBody: newChinaMobileUpdateAssetBody(req.Body),
		})
	case AssetOperationAssetDelete:
		id, err := requiredAssetString(req.Body, "Id")
		if err != nil {
			return nil, err
		}
		return client.DeleteAsset(&cmmodel.DeleteAssetRequest{DeleteAssetPath: (&cmmodel.DeleteAssetPath{}).SetAssetId(id)})
	case AssetOperationAssetGroupCreate:
		return client.CreateAssetGroup(&cmmodel.CreateAssetGroupRequest{CreateAssetGroupBody: newChinaMobileCreateAssetGroupBody(req.Body)})
	case AssetOperationAssetGroupList:
		return client.ListAssetGroups(&cmmodel.ListAssetGroupsRequest{ListAssetGroupsBody: newChinaMobileListAssetGroupsBody(req.Body)})
	case AssetOperationAssetGroupGet:
		id, err := requiredAssetString(req.Body, "Id")
		if err != nil {
			return nil, err
		}
		return client.GetAssetGroup(&cmmodel.GetAssetGroupRequest{GetAssetGroupPath: (&cmmodel.GetAssetGroupPath{}).SetGroupId(id)})
	case AssetOperationAssetGroupUpdate:
		id, err := requiredAssetString(req.Body, "Id")
		if err != nil {
			return nil, err
		}
		return client.UpdateAssetGroup(&cmmodel.UpdateAssetGroupRequest{
			UpdateAssetGroupPath: (&cmmodel.UpdateAssetGroupPath{}).SetGroupId(id),
			UpdateAssetGroupBody: newChinaMobileUpdateAssetGroupBody(req.Body),
		})
	case AssetOperationAssetGroupDelete:
		id, err := requiredAssetString(req.Body, "Id")
		if err != nil {
			return nil, err
		}
		return client.DeleteAssetGroup(&cmmodel.DeleteAssetGroupRequest{DeleteAssetGroupPath: (&cmmodel.DeleteAssetGroupPath{}).SetGroupId(id)})
	default:
		return nil, fmt.Errorf("unsupported asset operation %s", req.Action.Operation)
	}
}

func isChinaMobileAssetLocalValidationError(err error) bool {
	return err != nil && strings.Contains(err.Error(), " is required")
}

func classifyChinaMobileAssetSDKError(err error) *AssetError {
	if err == nil {
		return nil
	}
	if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
		return newAssetError(AssetErrorUpstream, err.Error(), http.StatusGatewayTimeout)
	}
	if isChinaMobileAssetLocalValidationError(err) {
		return newAssetError(AssetErrorInvalidRequest, err.Error(), http.StatusBadRequest)
	}
	var responseErr *cmerrs.ServerResponseError
	if errors.As(err, &responseErr) && responseErr.Code == http.StatusBadRequest {
		message := strings.TrimSpace(responseErr.Body)
		if message == "" {
			message = responseErr.Error()
		}
		return newAssetError(AssetErrorInvalidRequest, message, http.StatusBadRequest)
	}
	return nil
}

func validateChinaMobileAssetRequest(req AssetRequest) *AssetError {
	invalid := func(message string) *AssetError {
		return newAssetError(AssetErrorInvalidRequest, message, http.StatusBadRequest)
	}
	requireString := func(key string) *AssetError {
		if strings.TrimSpace(stringValue(req.Body, key)) == "" {
			return invalid(key + " is required")
		}
		return nil
	}
	validatePage := func() *AssetError {
		pageNumber := intValue(req.Body, "PageNumber", 1)
		pageSize := intValue(req.Body, "PageSize", 10)
		if pageNumber < 1 {
			return invalid("PageNumber must be greater than or equal to 1")
		}
		if pageSize < 1 || pageSize > 999999 {
			return invalid("PageSize must be between 1 and 999999")
		}
		return nil
	}

	switch req.Action.Operation {
	case AssetOperationAssetCreate:
		for _, key := range []string{"GroupId", "Name", "URL", "AssetType"} {
			if err := requireString(key); err != nil {
				return err
			}
		}
		if len([]rune(stringValue(req.Body, "Name"))) > 64 {
			return invalid("Name must not exceed 64 characters")
		}
		assetURL, err := url.ParseRequestURI(strings.TrimSpace(stringValue(req.Body, "URL")))
		if err != nil || (assetURL.Scheme != "http" && assetURL.Scheme != "https") || assetURL.Host == "" {
			return invalid("URL must be a valid public HTTP or HTTPS URL")
		}
		switch stringValue(req.Body, "AssetType") {
		case "Image", "Video", "Audio":
		default:
			return invalid("AssetType must be one of Image, Video, Audio")
		}
	case AssetOperationAssetList:
		if err := validatePage(); err != nil {
			return err
		}
		groupType := strings.TrimSpace(stringValue(mapValue(req.Body, "Filter"), "GroupType"))
		if groupType == "" {
			return invalid("Filter.GroupType is required")
		}
		if groupType != "AIGC" && groupType != "LivenessFace" {
			return invalid("Filter.GroupType must be AIGC or LivenessFace")
		}
	case AssetOperationAssetGroupCreate:
		if stringValue(req.Body, "GroupType") != "AIGC" {
			return invalid("GroupType must be AIGC")
		}
		if len([]rune(stringValue(req.Body, "Name"))) > 64 {
			return invalid("Name must not exceed 64 characters")
		}
		if len([]rune(stringValue(req.Body, "Description"))) > 300 {
			return invalid("Description must not exceed 300 characters")
		}
	case AssetOperationAssetGroupList:
		return validatePage()
	case AssetOperationAssetUpdate:
		if err := requireString("Id"); err != nil {
			return err
		}
		if len([]rune(stringValue(req.Body, "Name"))) > 64 {
			return invalid("Name must not exceed 64 characters")
		}
	case AssetOperationAssetGroupUpdate:
		if err := requireString("Id"); err != nil {
			return err
		}
		if len([]rune(stringValue(req.Body, "Name"))) > 64 {
			return invalid("Name must not exceed 64 characters")
		}
		if len([]rune(stringValue(req.Body, "Description"))) > 300 {
			return invalid("Description must not exceed 300 characters")
		}
	case AssetOperationAssetGet, AssetOperationAssetDelete, AssetOperationAssetGroupGet, AssetOperationAssetGroupDelete:
		return requireString("Id")
	}
	return nil
}

func newChinaMobileCreateAssetBody(body map[string]any) *cmmodel.CreateAssetBody {
	assetType := cmmodel.CreateAssetBodyAssetTypeEnum(stringValue(body, "AssetType"))
	result := &cmmodel.CreateAssetBody{}
	result.SetGroupId(stringValue(body, "GroupId"))
	result.SetAssetName(stringValue(body, "Name"))
	result.SetAssetUrl(stringValue(body, "URL"))
	if strings.TrimSpace(string(assetType)) != "" {
		result.SetAssetType(assetType)
	}
	return result
}

func newChinaMobileListAssetsBody(body map[string]any) *cmmodel.ListAssetsBody {
	mapped := mapChinaMobileListAssets(body)
	result := &cmmodel.ListAssetsBody{}
	result.SetPageNo(int32(intValue(mapped, "pageNo", 1)))
	result.SetPageSize(int32(intValue(mapped, "pageSize", 10)))
	if value := stringValue(mapped, "groupType"); value != "" {
		result.SetGroupType(value)
	}
	if value := stringValue(mapped, "assetName"); value != "" {
		result.SetAssetName(value)
	}
	if values := stringArrayValue(mapped, "groupIds"); len(values) > 0 {
		result.SetGroupIds(values)
	}
	if values := stringArrayValue(mapped, "statuses"); len(values) > 0 {
		result.SetStatuses(values)
	}
	return result
}

func newChinaMobileUpdateAssetBody(body map[string]any) *cmmodel.UpdateAssetBody {
	result := &cmmodel.UpdateAssetBody{}
	if value := stringValue(body, "Name"); value != "" {
		result.SetAssetName(value)
	}
	return result
}

func newChinaMobileCreateAssetGroupBody(body map[string]any) *cmmodel.CreateAssetGroupBody {
	result := &cmmodel.CreateAssetGroupBody{}
	if value := stringValue(body, "GroupType"); value != "" {
		result.SetGroupType(value)
	}
	if value := stringValue(body, "Name"); value != "" {
		result.SetGroupName(value)
	}
	if value := stringValue(body, "Description"); value != "" {
		result.SetDescription(value)
	}
	return result
}

func newChinaMobileListAssetGroupsBody(body map[string]any) *cmmodel.ListAssetGroupsBody {
	mapped := mapChinaMobileListAssetGroups(body)
	result := &cmmodel.ListAssetGroupsBody{}
	result.SetPageNo(int32(intValue(mapped, "pageNo", 1)))
	result.SetPageSize(int32(intValue(mapped, "pageSize", 10)))
	if value := stringValue(mapped, "groupType"); value != "" {
		result.SetGroupType(value)
	}
	if value := stringValue(mapped, "groupName"); value != "" {
		result.SetGroupName(value)
	}
	if values := stringArrayValue(mapped, "groupIds"); len(values) > 0 {
		result.SetGroupIds(values)
	}
	return result
}

func newChinaMobileUpdateAssetGroupBody(body map[string]any) *cmmodel.UpdateAssetGroupBody {
	result := &cmmodel.UpdateAssetGroupBody{}
	if value := stringValue(body, "Name"); value != "" {
		result.SetGroupName(value)
	}
	if value := stringValue(body, "Description"); value != "" {
		result.SetDescription(value)
	}
	return result
}

func buildChinaMobileAssetRequest(req AssetRequest) (string, string, map[string]any, error) {
	switch req.Action.Operation {
	case AssetOperationAssetCreate:
		return http.MethodPost, "/api/openapi-maas/exp/aicc/v2/asset", mapChinaMobileCreateAsset(req.Body), nil
	case AssetOperationAssetList:
		return http.MethodPost, "/api/openapi-maas/exp/aicc/v2/asset/query", mapChinaMobileListAssets(req.Body), nil
	case AssetOperationAssetGet:
		id, err := requiredAssetString(req.Body, "Id")
		return http.MethodGet, "/api/openapi-maas/exp/aicc/v2/asset/" + url.PathEscape(id), nil, err
	case AssetOperationAssetUpdate:
		id, err := requiredAssetString(req.Body, "Id")
		return http.MethodPut, "/api/openapi-maas/exp/aicc/v2/asset/" + url.PathEscape(id), mapChinaMobileUpdateAsset(req.Body), err
	case AssetOperationAssetDelete:
		id, err := requiredAssetString(req.Body, "Id")
		return http.MethodDelete, "/api/openapi-maas/exp/aicc/v2/asset/" + url.PathEscape(id), nil, err
	case AssetOperationAssetGroupCreate:
		return http.MethodPost, "/api/openapi-maas/exp/aicc/v2/asset-group", mapChinaMobileCreateAssetGroup(req.Body), nil
	case AssetOperationAssetGroupList:
		return http.MethodPost, "/api/openapi-maas/exp/aicc/v2/asset-group/query", mapChinaMobileListAssetGroups(req.Body), nil
	case AssetOperationAssetGroupGet:
		id, err := requiredAssetString(req.Body, "Id")
		return http.MethodGet, "/api/openapi-maas/exp/aicc/v2/asset-group/" + url.PathEscape(id), nil, err
	case AssetOperationAssetGroupUpdate:
		id, err := requiredAssetString(req.Body, "Id")
		return http.MethodPut, "/api/openapi-maas/exp/aicc/v2/asset-group/" + url.PathEscape(id), mapChinaMobileUpdateAssetGroup(req.Body), err
	case AssetOperationAssetGroupDelete:
		id, err := requiredAssetString(req.Body, "Id")
		return http.MethodDelete, "/api/openapi-maas/exp/aicc/v2/asset-group/" + url.PathEscape(id), nil, err
	default:
		return "", "", nil, fmt.Errorf("unsupported asset operation %s", req.Action.Operation)
	}
}

func mapChinaMobileCreateAsset(body map[string]any) map[string]any {
	return compactAssetMap(map[string]any{
		"groupId":   stringValue(body, "GroupId"),
		"assetName": stringValue(body, "Name"),
		"assetUrl":  stringValue(body, "URL"),
		"assetType": stringValue(body, "AssetType"),
	})
}

func mapChinaMobileListAssets(body map[string]any) map[string]any {
	filter := mapValue(body, "Filter")
	mapped := map[string]any{
		"pageNo":   intValue(body, "PageNumber", 1),
		"pageSize": intValue(body, "PageSize", 10),
	}
	copyStringArray(mapped, "groupIds", filter, "GroupIds")
	copyString(mapped, "groupType", filter, "GroupType")
	copyString(mapped, "assetName", filter, "Name")
	copyStatusArray(mapped, "statuses", filter, "Statuses")
	return compactAssetMap(mapped)
}

func mapChinaMobileUpdateAsset(body map[string]any) map[string]any {
	return compactAssetMap(map[string]any{"assetName": stringValue(body, "Name")})
}

func mapChinaMobileCreateAssetGroup(body map[string]any) map[string]any {
	return compactAssetMap(map[string]any{
		"groupType":   stringValue(body, "GroupType"),
		"groupName":   stringValue(body, "Name"),
		"description": stringValue(body, "Description"),
	})
}

func mapChinaMobileListAssetGroups(body map[string]any) map[string]any {
	filter := mapValue(body, "Filter")
	mapped := map[string]any{
		"pageNo":   intValue(body, "PageNumber", 1),
		"pageSize": intValue(body, "PageSize", 10),
	}
	copyString(mapped, "groupType", filter, "GroupType")
	copyString(mapped, "groupName", filter, "Name")
	copyStringArray(mapped, "groupIds", filter, "GroupIds")
	return compactAssetMap(mapped)
}

func mapChinaMobileUpdateAssetGroup(body map[string]any) map[string]any {
	return compactAssetMap(map[string]any{
		"groupName":   stringValue(body, "Name"),
		"description": stringValue(body, "Description"),
	})
}

func normalizeChinaMobileAssetResponse(spec AssetActionSpec, version string, data []byte) ([]byte, *AssetError) {
	var payload struct {
		RequestID    string `json:"requestId"`
		State        string `json:"state"`
		ErrorCode    string `json:"errorCode"`
		ErrorMessage string `json:"errorMessage"`
		Body         any    `json:"body"`
	}
	if err := common.Unmarshal(data, &payload); err != nil {
		return nil, newAssetError(AssetErrorUpstream, err.Error(), http.StatusBadGateway)
	}
	if strings.EqualFold(payload.State, "ERROR") {
		message := strings.TrimSpace(payload.ErrorMessage)
		if message == "" {
			message = payload.ErrorCode
		}
		return nil, newAssetError(AssetErrorUpstream, message, http.StatusBadGateway)
	}
	if !strings.EqualFold(payload.State, "OK") {
		return nil, newAssetError(AssetErrorUpstream, "China Mobile asset response has invalid state", http.StatusBadGateway)
	}
	if spec.Delete {
		deleted, ok := payload.Body.(bool)
		if !ok || !deleted {
			return nil, newAssetError(AssetErrorUpstream, "China Mobile asset delete was not confirmed", http.StatusBadGateway)
		}
	}
	var result any
	if !spec.Delete {
		result = normalizeChinaMobileResult(spec.Operation, payload.Body)
	}
	body, err := buildAssetSuccessResponseWithRequestID(spec.Action, version, payload.RequestID, result)
	if err != nil {
		return nil, newAssetError(AssetErrorServer, err.Error(), http.StatusInternalServerError)
	}
	return body, nil
}

func normalizeChinaMobileAssetSDKResponse(spec AssetActionSpec, version string, response any) ([]byte, *AssetError) {
	data, err := common.Marshal(response)
	if err != nil {
		return nil, newAssetError(AssetErrorServer, err.Error(), http.StatusInternalServerError)
	}
	return normalizeChinaMobileAssetResponse(spec, version, data)
}

func normalizeChinaMobileResult(operation AssetOperation, body any) any {
	raw, ok := body.(map[string]any)
	if !ok {
		return body
	}
	switch operation {
	case AssetOperationAssetList:
		return map[string]any{
			"Items":      normalizeChinaMobileItems(raw["data"], false),
			"TotalCount": raw["total"],
		}
	case AssetOperationAssetGroupList:
		return map[string]any{
			"Items":      normalizeChinaMobileItems(raw["data"], true),
			"TotalCount": raw["total"],
		}
	case AssetOperationAssetGroupCreate, AssetOperationAssetGroupGet, AssetOperationAssetGroupUpdate:
		return normalizeChinaMobileAssetGroup(raw)
	default:
		return normalizeChinaMobileAsset(raw)
	}
}

func normalizeChinaMobileItems(value any, group bool) []any {
	items, ok := value.([]any)
	if !ok {
		return nil
	}
	normalized := make([]any, 0, len(items))
	for _, item := range items {
		raw, ok := item.(map[string]any)
		if !ok {
			continue
		}
		if group {
			normalized = append(normalized, normalizeChinaMobileAssetGroup(raw))
		} else {
			normalized = append(normalized, normalizeChinaMobileAsset(raw))
		}
	}
	return normalized
}

func normalizeChinaMobileAsset(raw map[string]any) map[string]any {
	return compactAssetMap(map[string]any{
		"Id":           raw["assetId"],
		"GroupId":      raw["groupId"],
		"Name":         raw["assetName"],
		"AssetType":    raw["assetType"],
		"URL":          raw["assetUrl"],
		"Status":       chinaMobileStatusToOfficial(fmt.Sprint(raw["status"])),
		"ErrorMessage": raw["errorMessage"],
		"CreatedAt":    raw["createdTime"],
		"UpdatedAt":    raw["updatedTime"],
	})
}

func normalizeChinaMobileAssetGroup(raw map[string]any) map[string]any {
	return compactAssetMap(map[string]any{
		"Id":          raw["groupId"],
		"GroupId":     raw["groupId"],
		"GroupType":   raw["groupType"],
		"Name":        raw["groupName"],
		"Description": raw["description"],
		"CreatedAt":   raw["createdTime"],
		"UpdatedAt":   raw["updatedTime"],
	})
}

func validateChinaMobileCompatibility(body map[string]any) *AssetError {
	if projectName := strings.TrimSpace(stringValue(body, "ProjectName")); projectName != "" && projectName != "default" {
		return newAssetError(AssetErrorOperationNotSupported, "China Mobile asset API does not support non-default ProjectName", http.StatusBadRequest)
	}
	if sortBy := strings.TrimSpace(stringValue(body, "SortBy")); sortBy != "" && sortBy != "CreateTime" {
		return newAssetError(AssetErrorOperationNotSupported, "China Mobile asset API does not support custom SortBy", http.StatusBadRequest)
	}
	if sortOrder := strings.TrimSpace(stringValue(body, "SortOrder")); sortOrder != "" && !strings.EqualFold(sortOrder, "Desc") {
		return newAssetError(AssetErrorOperationNotSupported, "China Mobile asset API does not support custom SortOrder", http.StatusBadRequest)
	}
	return nil
}

func chinaMobileStatusToOfficial(status string) string {
	switch strings.ToUpper(strings.TrimSpace(status)) {
	case "PROCESSING":
		return "Processing"
	case "ACTIVE":
		return "Active"
	case "FAILED":
		return "Failed"
	default:
		return status
	}
}

func officialStatusToChinaMobile(status string) string {
	switch strings.ToLower(strings.TrimSpace(status)) {
	case "processing":
		return "PROCESSING"
	case "active":
		return "ACTIVE"
	case "failed":
		return "FAILED"
	default:
		return status
	}
}

func requiredAssetString(body map[string]any, key string) (string, error) {
	value := strings.TrimSpace(stringValue(body, key))
	if value == "" {
		return "", fmt.Errorf("%s is required", key)
	}
	return value, nil
}

func stringValue(body map[string]any, key string) string {
	if body == nil {
		return ""
	}
	value, _ := body[key].(string)
	return value
}

func mapValue(body map[string]any, key string) map[string]any {
	if body == nil {
		return nil
	}
	value, _ := body[key].(map[string]any)
	return value
}

func intValue(body map[string]any, key string, fallback int) int {
	if body == nil {
		return fallback
	}
	switch value := body[key].(type) {
	case int:
		return value
	case int32:
		return int(value)
	case int64:
		return int(value)
	case float64:
		return int(value)
	case float32:
		return int(value)
	default:
		return fallback
	}
}

func copyString(dst map[string]any, dstKey string, src map[string]any, srcKey string) {
	value := stringValue(src, srcKey)
	if strings.TrimSpace(value) != "" {
		dst[dstKey] = value
	}
}

func copyStringArray(dst map[string]any, dstKey string, src map[string]any, srcKey string) {
	values := stringArrayValue(src, srcKey)
	if len(values) > 0 {
		dst[dstKey] = values
	}
}

func copyStatusArray(dst map[string]any, dstKey string, src map[string]any, srcKey string) {
	values := stringArrayValue(src, srcKey)
	if len(values) == 0 {
		return
	}
	mapped := make([]string, 0, len(values))
	for _, value := range values {
		mapped = append(mapped, officialStatusToChinaMobile(value))
	}
	dst[dstKey] = mapped
}

func stringArrayValue(body map[string]any, key string) []string {
	if body == nil {
		return nil
	}
	switch value := body[key].(type) {
	case []string:
		return value
	case []any:
		values := make([]string, 0, len(value))
		for _, item := range value {
			if s, ok := item.(string); ok && strings.TrimSpace(s) != "" {
				values = append(values, s)
			}
		}
		return values
	default:
		return nil
	}
}

func compactAssetMap(input map[string]any) map[string]any {
	output := make(map[string]any, len(input))
	for key, value := range input {
		switch v := value.(type) {
		case string:
			if strings.TrimSpace(v) != "" {
				output[key] = v
			}
		case nil:
			continue
		default:
			output[key] = value
		}
	}
	return output
}