package relay

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

	relayconstant "github.com/QuantumNous/new-api/relay/constant"

	"github.com/QuantumNous/new-api/common"
	"github.com/QuantumNous/new-api/constant"
	"github.com/QuantumNous/new-api/dto"
	"github.com/QuantumNous/new-api/logger"
	relaycommon "github.com/QuantumNous/new-api/relay/common"
	"github.com/QuantumNous/new-api/relay/helper"
	"github.com/QuantumNous/new-api/service"
	"github.com/QuantumNous/new-api/setting/model_setting"
	"github.com/QuantumNous/new-api/types"

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

type imageResponseCaptureWriter struct {
	gin.ResponseWriter
	buf *bytes.Buffer
}

func (w *imageResponseCaptureWriter) Write(data []byte) (int, error) {
	if w.buf != nil {
		_, _ = w.buf.Write(data)
	}
	return w.ResponseWriter.Write(data)
}

func ImageHelper(c *gin.Context, info *relaycommon.RelayInfo) (tokenFactoryError *types.TokenFactoryError) {
	info.InitChannelMeta(c)

	imageReq, ok := info.Request.(*dto.ImageRequest)
	if !ok {
		return types.NewErrorWithStatusCode(fmt.Errorf("invalid request type, expected dto.ImageRequest, got %T", info.Request), types.ErrorCodeInvalidRequest, http.StatusBadRequest, types.ErrOptionWithSkipRetry())
	}

	request, err := common.DeepCopy(imageReq)
	if err != nil {
		return types.NewError(fmt.Errorf("failed to copy request to ImageRequest: %w", err), types.ErrorCodeInvalidRequest, types.ErrOptionWithSkipRetry())
	}

	err = helper.ModelMappedHelper(c, info, request)
	if err != nil {
		return types.NewError(err, types.ErrorCodeChannelModelMappedError, types.ErrOptionWithSkipRetry())
	}

	adaptor := GetAdaptor(info.ApiType)
	if adaptor == nil {
		return types.NewError(fmt.Errorf("invalid api type: %d", info.ApiType), types.ErrorCodeInvalidApiType, types.ErrOptionWithSkipRetry())
	}
	adaptor.Init(info)

	var requestBody io.Reader

	if model_setting.GetGlobalSettings().PassThroughRequestEnabled || info.ChannelSetting.PassThroughBodyEnabled {
		storage, err := common.GetBodyStorage(c)
		if err != nil {
			return types.NewErrorWithStatusCode(err, types.ErrorCodeReadRequestBodyFailed, http.StatusBadRequest, types.ErrOptionWithSkipRetry())
		}
		requestBody = common.ReaderOnly(storage)
	} else {
		convertedRequest, err := adaptor.ConvertImageRequest(c, info, *request)
		if err != nil {
			return types.NewError(err, types.ErrorCodeConvertRequestFailed)
		}
		relaycommon.AppendRequestConversionFromRequest(info, convertedRequest)

		switch convertedRequest.(type) {
		case *bytes.Buffer:
			requestBody = convertedRequest.(io.Reader)
		default:
			jsonData, err := common.Marshal(convertedRequest)
			if err != nil {
				return types.NewError(err, types.ErrorCodeConvertRequestFailed, types.ErrOptionWithSkipRetry())
			}

			// apply param override
			if len(info.ParamOverride) > 0 {
				jsonData, err = relaycommon.ApplyParamOverrideWithRelayInfo(jsonData, info)
				if err != nil {
					return tokenFactoryErrorFromParamOverride(err)
				}
			}

			if common.DebugEnabled {
				logger.LogDebug(c, fmt.Sprintf("image request body: %s", string(jsonData)))
			}
			requestBody = bytes.NewBuffer(jsonData)
		}
	}

	statusCodeMappingStr := c.GetString("status_code_mapping")

	captureImageResponse := shouldCaptureImageResponse(info)
	var responseCapture *bytes.Buffer
	if captureImageResponse {
		responseCapture = &bytes.Buffer{}
		c.Writer = &imageResponseCaptureWriter{ResponseWriter: c.Writer, buf: responseCapture}
	}

	resp, err := adaptor.DoRequest(c, info, requestBody)
	if err != nil {
		return types.NewOpenAIError(err, types.ErrorCodeDoRequestFailed, http.StatusInternalServerError)
	}
	var httpResp *http.Response
	if resp != nil {
		httpResp = resp.(*http.Response)
		info.IsStream = info.IsStream || strings.HasPrefix(httpResp.Header.Get("Content-Type"), "text/event-stream")
		if httpResp.StatusCode != http.StatusOK {
			if httpResp.StatusCode == http.StatusCreated && info.ApiType == constant.APITypeReplicate {
				// replicate channel returns 201 Created when using Prefer: wait, treat it as success.
				httpResp.StatusCode = http.StatusOK
			} else {
				tokenFactoryError = service.RelayErrorHandler(c.Request.Context(), httpResp, false)
				// reset status code 重置状态码
				service.ResetStatusCode(tokenFactoryError, statusCodeMappingStr)
				return tokenFactoryError
			}
		}
	}

	usage, tokenFactoryError := adaptor.DoResponse(c, httpResp, info)
	if tokenFactoryError != nil {
		// reset status code 重置状态码
		service.ResetStatusCode(tokenFactoryError, statusCodeMappingStr)
		return tokenFactoryError
	}

	imageN := uint(1)
	if request.N != nil {
		imageN = *request.N
	}
	if captureImageResponse && responseCapture != nil {
		helper.FinalizeImagePerImageBilling(c, info, request, responseCapture.Bytes())
		if n, ok := info.PriceData.OtherRatios["n"]; ok && n > 0 {
			imageN = uint(n)
		}
	} else if _, hasN := info.PriceData.OtherRatios["n"]; !hasN {
		info.PriceData.AddOtherRatio("n", float64(imageN))
	}

	if usage.(*dto.Usage).TotalTokens == 0 {
		usage.(*dto.Usage).TotalTokens = 1
	}
	if usage.(*dto.Usage).PromptTokens == 0 {
		usage.(*dto.Usage).PromptTokens = 1
	}

	quality := "standard"
	if request.Quality == "hd" {
		quality = "hd"
	}

	var logContent []string

	if len(request.Size) > 0 {
		logContent = append(logContent, fmt.Sprintf("大小 %s", request.Size))
	}
	if len(quality) > 0 {
		logContent = append(logContent, fmt.Sprintf("品质 %s", quality))
	}
	if imageN > 0 {
		logContent = append(logContent, fmt.Sprintf("生成数量 %d", imageN))
	}

	service.PostTextConsumeQuota(c, info, usage.(*dto.Usage), logContent)
	return nil
}

func shouldCaptureImageResponse(info *relaycommon.RelayInfo) bool {
	if info == nil || info.ImageBilling == nil || !info.PriceData.UsePrice {
		return false
	}
	return info.RelayMode == relayconstant.RelayModeImagesGenerations ||
		info.RelayMode == relayconstant.RelayModeImagesEdits
}