package controller

import (
	"bytes"
	"errors"
	"fmt"
	"io"
	"log"
	"net/http"
	"strings"

	"github.com/QuantumNous/new-api/common"
	"github.com/QuantumNous/new-api/constant"
	"github.com/QuantumNous/new-api/dto"
	"github.com/QuantumNous/new-api/logger"
	"github.com/QuantumNous/new-api/middleware"
	"github.com/QuantumNous/new-api/model"
	"github.com/QuantumNous/new-api/relay"
	relaycommon "github.com/QuantumNous/new-api/relay/common"
	relayconstant "github.com/QuantumNous/new-api/relay/constant"
	"github.com/QuantumNous/new-api/relay/helper"
	"github.com/QuantumNous/new-api/service"
	"github.com/QuantumNous/new-api/setting"
	"github.com/QuantumNous/new-api/setting/operation_setting"
	"github.com/QuantumNous/new-api/types"

	"github.com/bytedance/gopkg/util/gopool"

	"github.com/gin-gonic/gin"
	"github.com/gorilla/websocket"
)

func relayHandler(c *gin.Context, info *relaycommon.RelayInfo) *types.NewAPIError {
	var err *types.NewAPIError
	switch info.RelayMode {
	case relayconstant.RelayModeImagesGenerations, relayconstant.RelayModeImagesEdits:
		err = relay.ImageHelper(c, info)
	case relayconstant.RelayModeAudioSpeech:
		fallthrough
	case relayconstant.RelayModeAudioTranslation:
		fallthrough
	case relayconstant.RelayModeAudioTranscription:
		err = relay.AudioHelper(c, info)
	case relayconstant.RelayModeRerank:
		err = relay.RerankHelper(c, info)
	case relayconstant.RelayModeEmbeddings:
		err = relay.EmbeddingHelper(c, info)
	case relayconstant.RelayModeResponses, relayconstant.RelayModeResponsesCompact:
		err = relay.ResponsesHelper(c, info)
	default:
		err = relay.TextHelper(c, info)
	}
	return err
}

func geminiRelayHandler(c *gin.Context, info *relaycommon.RelayInfo) *types.NewAPIError {
	var err *types.NewAPIError
	if strings.Contains(c.Request.URL.Path, "embed") {
		err = relay.GeminiEmbeddingHandler(c, info)
	} else {
		err = relay.GeminiHelper(c, info)
	}
	return err
}

func Relay(c *gin.Context, relayFormat types.RelayFormat) {

	requestId := c.GetString(common.RequestIdKey)
	//group := common.GetContextKeyString(c, constant.ContextKeyUsingGroup)
	//originalModel := common.GetContextKeyString(c, constant.ContextKeyOriginalModel)

	var (
		newAPIError *types.NewAPIError
		ws          *websocket.Conn
	)

	if relayFormat == types.RelayFormatOpenAIRealtime {
		var err error
		ws, err = upgrader.Upgrade(c.Writer, c.Request, nil)
		if err != nil {
			helper.WssError(c, ws, types.NewError(err, types.ErrorCodeGetChannelFailed, types.ErrOptionWithSkipRetry()).ToOpenAIError())
			return
		}
		defer ws.Close()
	}

	defer func() {
		if newAPIError != nil {
			logger.LogError(c, fmt.Sprintf("relay error: %s", newAPIError.Error()))
			newAPIError.SetMessage(common.MessageWithRequestId(newAPIError.Error(), requestId))
			switch relayFormat {
			case types.RelayFormatOpenAIRealtime:
				helper.WssError(c, ws, newAPIError.ToOpenAIError())
			case types.RelayFormatClaude:
				c.JSON(newAPIError.StatusCode, gin.H{
					"type":  "error",
					"error": newAPIError.ToClaudeError(),
				})
			default:
				c.JSON(newAPIError.StatusCode, gin.H{
					"error": newAPIError.ToOpenAIError(),
				})
			}
		}
	}()

	request, err := helper.GetAndValidateRequest(c, relayFormat)
	if err != nil {
		// Map "request body too large" to 413 so clients can handle it correctly
		if common.IsRequestBodyTooLargeError(err) || errors.Is(err, common.ErrRequestBodyTooLarge) {
			newAPIError = types.NewErrorWithStatusCode(err, types.ErrorCodeReadRequestBodyFailed, http.StatusRequestEntityTooLarge, types.ErrOptionWithSkipRetry())
		} else {
			newAPIError = types.NewError(err, types.ErrorCodeInvalidRequest)
		}
		return
	}

	relayInfo, err := relaycommon.GenRelayInfo(c, relayFormat, request, ws)
	if err != nil {
		newAPIError = types.NewError(err, types.ErrorCodeGenRelayInfoFailed)
		return
	}

	needSensitiveCheck := setting.ShouldCheckPromptSensitive()
	needCountToken := constant.CountToken
	// Avoid building huge CombineText (strings.Join) when token counting and sensitive check are both disabled.
	var meta *types.TokenCountMeta
	if needSensitiveCheck || needCountToken {
		meta = request.GetTokenCountMeta()
	} else {
		meta = fastTokenCountMetaForPricing(request)
	}

	if needSensitiveCheck && meta != nil {
		contains, words := service.CheckSensitiveText(meta.CombineText)
		if contains {
			logger.LogWarn(c, fmt.Sprintf("user sensitive words detected: %s", strings.Join(words, ", ")))
			newAPIError = types.NewError(err, types.ErrorCodeSensitiveWordsDetected)
			return
		}
	}

	tokens, err := service.EstimateRequestToken(c, meta, relayInfo)
	if err != nil {
		newAPIError = types.NewError(err, types.ErrorCodeCountTokenFailed)
		return
	}

	relayInfo.SetEstimatePromptTokens(tokens)

	priceData, err := helper.ModelPriceHelper(c, relayInfo, tokens, meta)
	if err != nil {
		newAPIError = types.NewError(err, types.ErrorCodeModelPriceError)
		return
	}

	// common.SetContextKey(c, constant.ContextKeyTokenCountMeta, meta)

	if priceData.FreeModel {
		logger.LogInfo(c, fmt.Sprintf("模型 %s 免费，跳过预扣费", relayInfo.OriginModelName))
	} else {
		newAPIError = service.PreConsumeQuota(c, priceData.QuotaToPreConsume, relayInfo)
		if newAPIError != nil {
			return
		}
	}

	defer func() {
		// Only return quota if downstream failed and quota was actually pre-consumed
		if newAPIError != nil {
			newAPIError = service.NormalizeViolationFeeError(newAPIError)
			if relayInfo.FinalPreConsumedQuota != 0 {
				service.ReturnPreConsumedQuota(c, relayInfo)
			}
			service.ChargeViolationFeeIfNeeded(c, relayInfo, newAPIError)
		}
	}()

	retryParam := &service.RetryParam{
		Ctx:        c,
		TokenGroup: relayInfo.TokenGroup,
		ModelName:  relayInfo.OriginModelName,
		Retry:      common.GetPointer(0),
	}

	for ; retryParam.GetRetry() <= common.RetryTimes; retryParam.IncreaseRetry() {
		channel, channelErr := getChannel(c, relayInfo, retryParam)
		if channelErr != nil {
			logger.LogError(c, channelErr.Error())
			newAPIError = channelErr
			break
		}

		addUsedChannel(c, channel.Id)
		requestBody, bodyErr := common.GetRequestBody(c)
		if bodyErr != nil {
			// Ensure consistent 413 for oversized bodies even when error occurs later (e.g., retry path)
			if common.IsRequestBodyTooLargeError(bodyErr) || errors.Is(bodyErr, common.ErrRequestBodyTooLarge) {
				newAPIError = types.NewErrorWithStatusCode(bodyErr, types.ErrorCodeReadRequestBodyFailed, http.StatusRequestEntityTooLarge, types.ErrOptionWithSkipRetry())
			} else {
				newAPIError = types.NewErrorWithStatusCode(bodyErr, types.ErrorCodeReadRequestBodyFailed, http.StatusBadRequest, types.ErrOptionWithSkipRetry())
			}
			break
		}
		c.Request.Body = io.NopCloser(bytes.NewBuffer(requestBody))

		switch relayFormat {
		case types.RelayFormatOpenAIRealtime:
			newAPIError = relay.WssHelper(c, relayInfo)
		case types.RelayFormatClaude:
			newAPIError = relay.ClaudeHelper(c, relayInfo)
		case types.RelayFormatGemini:
			newAPIError = geminiRelayHandler(c, relayInfo)
		default:
			newAPIError = relayHandler(c, relayInfo)
		}

		if newAPIError == nil {
			return
		}

		newAPIError = service.NormalizeViolationFeeError(newAPIError)

		processChannelError(c, *types.NewChannelError(channel.Id, channel.Type, channel.Name, channel.ChannelInfo.IsMultiKey, common.GetContextKeyString(c, constant.ContextKeyChannelKey), channel.GetAutoBan()), newAPIError)

		if !shouldRetry(c, newAPIError, common.RetryTimes-retryParam.GetRetry()) {
			break
		}
	}

	useChannel := c.GetStringSlice("use_channel")
	if len(useChannel) > 1 {
		retryLogStr := fmt.Sprintf("重试：%s", strings.Trim(strings.Join(strings.Fields(fmt.Sprint(useChannel)), "->"), "[]"))
		logger.LogInfo(c, retryLogStr)
	}
}

var upgrader = websocket.Upgrader{
	Subprotocols: []string{"realtime"}, // WS 握手支持的协议，如果有使用 Sec-WebSocket-Protocol，则必须在此声明对应的 Protocol TODO add other protocol
	CheckOrigin: func(r *http.Request) bool {
		return true // 允许跨域
	},
}

func addUsedChannel(c *gin.Context, channelId int) {
	useChannel := c.GetStringSlice("use_channel")
	useChannel = append(useChannel, fmt.Sprintf("%d", channelId))
	c.Set("use_channel", useChannel)
}

func fastTokenCountMetaForPricing(request dto.Request) *types.TokenCountMeta {
	if request == nil {
		return &types.TokenCountMeta{}
	}
	meta := &types.TokenCountMeta{
		TokenType: types.TokenTypeTokenizer,
	}
	switch r := request.(type) {
	case *dto.GeneralOpenAIRequest:
		if r.MaxCompletionTokens > r.MaxTokens {
			meta.MaxTokens = int(r.MaxCompletionTokens)
		} else {
			meta.MaxTokens = int(r.MaxTokens)
		}
	case *dto.OpenAIResponsesRequest:
		meta.MaxTokens = int(r.MaxOutputTokens)
	case *dto.ClaudeRequest:
		meta.MaxTokens = int(r.MaxTokens)
	case *dto.ImageRequest:
		// Pricing for image requests depends on ImagePriceRatio; safe to compute even when CountToken is disabled.
		return r.GetTokenCountMeta()
	default:
		// Best-effort: leave CombineText empty to avoid large allocations.
	}
	return meta
}

func getChannel(c *gin.Context, info *relaycommon.RelayInfo, retryParam *service.RetryParam) (*model.Channel, *types.NewAPIError) {
	if info.ChannelMeta == nil {
		autoBan := c.GetBool("auto_ban")
		autoBanInt := 1
		if !autoBan {
			autoBanInt = 0
		}
		return &model.Channel{
			Id:      c.GetInt("channel_id"),
			Type:    c.GetInt("channel_type"),
			Name:    c.GetString("channel_name"),
			AutoBan: &autoBanInt,
		}, nil
	}
	channel, selectGroup, err := service.CacheGetRandomSatisfiedChannel(retryParam)

	info.PriceData.GroupRatioInfo = helper.HandleGroupRatio(c, info)

	if err != nil {
		return nil, types.NewError(fmt.Errorf("获取分组 %s 下模型 %s 的可用渠道失败（retry）: %s", selectGroup, info.OriginModelName, err.Error()), types.ErrorCodeGetChannelFailed, types.ErrOptionWithSkipRetry())
	}
	if channel == nil {
		return nil, types.NewError(fmt.Errorf("分组 %s 下模型 %s 的可用渠道不存在（retry）", selectGroup, info.OriginModelName), types.ErrorCodeGetChannelFailed, types.ErrOptionWithSkipRetry())
	}

	newAPIError := middleware.SetupContextForSelectedChannel(c, channel, info.OriginModelName)
	if newAPIError != nil {
		return nil, newAPIError
	}
	return channel, nil
}

func shouldRetry(c *gin.Context, openaiErr *types.NewAPIError, retryTimes int) bool {
	if openaiErr == nil {
		return false
	}
	if types.IsChannelError(openaiErr) {
		return true
	}
	if types.IsSkipRetryError(openaiErr) {
		return false
	}
	if retryTimes <= 0 {
		return false
	}
	if _, ok := c.Get("specific_channel_id"); ok {
		return false
	}
	code := openaiErr.StatusCode
	if code >= 200 && code < 300 {
		return false
	}
	if code < 100 || code > 599 {
		return true
	}
	return operation_setting.ShouldRetryByStatusCode(code)
}

func processChannelError(c *gin.Context, channelError types.ChannelError, err *types.NewAPIError) {
	logger.LogError(c, fmt.Sprintf("channel error (channel #%d, status code: %d): %s", channelError.ChannelId, err.StatusCode, err.Error()))
	// 不要使用context获取渠道信息，异步处理时可能会出现渠道信息不一致的情况
	// do not use context to get channel info, there may be inconsistent channel info when processing asynchronously
	if service.ShouldDisableChannel(channelError.ChannelType, err) && channelError.AutoBan {
		gopool.Go(func() {
			service.DisableChannel(channelError, err.ErrorWithStatusCode())
		})
	}

	if constant.ErrorLogEnabled && types.IsRecordErrorLog(err) {
		// 保存错误日志到mysql中
		userId := c.GetInt("id")
		tokenName := c.GetString("token_name")
		modelName := c.GetString("original_model")
		tokenId := c.GetInt("token_id")
		userGroup := c.GetString("group")
		channelId := c.GetInt("channel_id")
		other := make(map[string]interface{})
		if c.Request != nil && c.Request.URL != nil {
			other["request_path"] = c.Request.URL.Path
		}
		other["error_type"] = err.GetErrorType()
		other["error_code"] = err.GetErrorCode()
		other["status_code"] = err.StatusCode
		other["channel_id"] = channelId
		other["channel_name"] = c.GetString("channel_name")
		other["channel_type"] = c.GetInt("channel_type")
		adminInfo := make(map[string]interface{})
		adminInfo["use_channel"] = c.GetStringSlice("use_channel")
		isMultiKey := common.GetContextKeyBool(c, constant.ContextKeyChannelIsMultiKey)
		if isMultiKey {
			adminInfo["is_multi_key"] = true
			adminInfo["multi_key_index"] = common.GetContextKeyInt(c, constant.ContextKeyChannelMultiKeyIndex)
		}
		service.AppendChannelAffinityAdminInfo(c, adminInfo)
		other["admin_info"] = adminInfo
		model.RecordErrorLog(c, userId, channelId, modelName, tokenName, err.MaskSensitiveErrorWithStatusCode(), tokenId, 0, false, userGroup, other)
	}

}

func RelayMidjourney(c *gin.Context) {
	relayInfo, err := relaycommon.GenRelayInfo(c, types.RelayFormatMjProxy, nil, nil)

	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{
			"description": fmt.Sprintf("failed to generate relay info: %s", err.Error()),
			"type":        "upstream_error",
			"code":        4,
		})
		return
	}

	var mjErr *dto.MidjourneyResponse
	switch relayInfo.RelayMode {
	case relayconstant.RelayModeMidjourneyNotify:
		mjErr = relay.RelayMidjourneyNotify(c)
	case relayconstant.RelayModeMidjourneyTaskFetch, relayconstant.RelayModeMidjourneyTaskFetchByCondition:
		mjErr = relay.RelayMidjourneyTask(c, relayInfo.RelayMode)
	case relayconstant.RelayModeMidjourneyTaskImageSeed:
		mjErr = relay.RelayMidjourneyTaskImageSeed(c)
	case relayconstant.RelayModeSwapFace:
		mjErr = relay.RelaySwapFace(c, relayInfo)
	default:
		mjErr = relay.RelayMidjourneySubmit(c, relayInfo)
	}
	//err = relayMidjourneySubmit(c, relayMode)
	log.Println(mjErr)
	if mjErr != nil {
		statusCode := http.StatusBadRequest
		if mjErr.Code == 30 {
			mjErr.Result = "当前分组负载已饱和，请稍后再试，或升级账户以提升服务质量。"
			statusCode = http.StatusTooManyRequests
		}
		c.JSON(statusCode, gin.H{
			"description": fmt.Sprintf("%s %s", mjErr.Description, mjErr.Result),
			"type":        "upstream_error",
			"code":        mjErr.Code,
		})
		channelId := c.GetInt("channel_id")
		logger.LogError(c, fmt.Sprintf("relay error (channel #%d, status code %d): %s", channelId, statusCode, fmt.Sprintf("%s %s", mjErr.Description, mjErr.Result)))
	}
}

func RelayNotImplemented(c *gin.Context) {
	err := types.OpenAIError{
		Message: "API not implemented",
		Type:    "new_api_error",
		Param:   "",
		Code:    "api_not_implemented",
	}
	c.JSON(http.StatusNotImplemented, gin.H{
		"error": err,
	})
}

func RelayNotFound(c *gin.Context) {
	err := types.OpenAIError{
		Message: fmt.Sprintf("Invalid URL (%s %s)", c.Request.Method, c.Request.URL.Path),
		Type:    "invalid_request_error",
		Param:   "",
		Code:    "",
	}
	c.JSON(http.StatusNotFound, gin.H{
		"error": err,
	})
}

func RelayTask(c *gin.Context) {
	retryTimes := common.RetryTimes
	channelId := c.GetInt("channel_id")
	c.Set("use_channel", []string{fmt.Sprintf("%d", channelId)})
	relayInfo, err := relaycommon.GenRelayInfo(c, types.RelayFormatTask, nil, nil)
	if err != nil {
		return
	}
	taskErr := taskRelayHandler(c, relayInfo)
	if taskErr == nil {
		retryTimes = 0
	}
	retryParam := &service.RetryParam{
		Ctx:        c,
		TokenGroup: relayInfo.TokenGroup,
		ModelName:  relayInfo.OriginModelName,
		Retry:      common.GetPointer(0),
	}
	for ; shouldRetryTaskRelay(c, channelId, taskErr, retryTimes) && retryParam.GetRetry() < retryTimes; retryParam.IncreaseRetry() {
		channel, newAPIError := getChannel(c, relayInfo, retryParam)
		if newAPIError != nil {
			logger.LogError(c, fmt.Sprintf("CacheGetRandomSatisfiedChannel failed: %s", newAPIError.Error()))
			taskErr = service.TaskErrorWrapperLocal(newAPIError.Err, "get_channel_failed", http.StatusInternalServerError)
			break
		}
		channelId = channel.Id
		useChannel := c.GetStringSlice("use_channel")
		useChannel = append(useChannel, fmt.Sprintf("%d", channelId))
		c.Set("use_channel", useChannel)
		logger.LogInfo(c, fmt.Sprintf("using channel #%d to retry (remain times %d)", channel.Id, retryParam.GetRetry()))
		//middleware.SetupContextForSelectedChannel(c, channel, originalModel)

		requestBody, err := common.GetRequestBody(c)
		if err != nil {
			if common.IsRequestBodyTooLargeError(err) || errors.Is(err, common.ErrRequestBodyTooLarge) {
				taskErr = service.TaskErrorWrapperLocal(err, "read_request_body_failed", http.StatusRequestEntityTooLarge)
			} else {
				taskErr = service.TaskErrorWrapperLocal(err, "read_request_body_failed", http.StatusBadRequest)
			}
			break
		}
		c.Request.Body = io.NopCloser(bytes.NewBuffer(requestBody))
		taskErr = taskRelayHandler(c, relayInfo)
	}
	useChannel := c.GetStringSlice("use_channel")
	if len(useChannel) > 1 {
		retryLogStr := fmt.Sprintf("重试：%s", strings.Trim(strings.Join(strings.Fields(fmt.Sprint(useChannel)), "->"), "[]"))
		logger.LogInfo(c, retryLogStr)
	}
	if taskErr != nil {
		if taskErr.StatusCode == http.StatusTooManyRequests {
			taskErr.Message = "当前分组上游负载已饱和，请稍后再试"
		}
		c.JSON(taskErr.StatusCode, taskErr)
	}
}

func taskRelayHandler(c *gin.Context, relayInfo *relaycommon.RelayInfo) *dto.TaskError {
	var err *dto.TaskError
	switch relayInfo.RelayMode {
	case relayconstant.RelayModeSunoFetch, relayconstant.RelayModeSunoFetchByID, relayconstant.RelayModeVideoFetchByID:
		err = relay.RelayTaskFetch(c, relayInfo.RelayMode)
	default:
		err = relay.RelayTaskSubmit(c, relayInfo)
	}
	return err
}

func shouldRetryTaskRelay(c *gin.Context, channelId int, taskErr *dto.TaskError, retryTimes int) bool {
	if taskErr == nil {
		return false
	}
	if retryTimes <= 0 {
		return false
	}
	if _, ok := c.Get("specific_channel_id"); ok {
		return false
	}
	if taskErr.StatusCode == http.StatusTooManyRequests {
		return true
	}
	if taskErr.StatusCode == 307 {
		return true
	}
	if taskErr.StatusCode/100 == 5 {
		// 超时不重试
		if taskErr.StatusCode == 504 || taskErr.StatusCode == 524 {
			return false
		}
		return true
	}
	if taskErr.StatusCode == http.StatusBadRequest {
		return false
	}
	if taskErr.StatusCode == 408 {
		// azure处理超时不重试
		return false
	}
	if taskErr.LocalError {
		return false
	}
	if taskErr.StatusCode/100 == 2 {
		return false
	}
	return true
}
