package ali

import (
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"one-api/common"
	"one-api/dto"
	"one-api/logger"
	relaycommon "one-api/relay/common"
	"one-api/service"
	"one-api/types"
	"strings"
	"time"

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

func oaiImage2Ali(request dto.ImageRequest) (*AliImageRequest, error) {
	var imageRequest AliImageRequest
	imageRequest.Model = request.Model
	imageRequest.ResponseFormat = request.ResponseFormat

	if request.Extra != nil {
		if val, ok := request.Extra["parameters"]; ok {
			err := common.Unmarshal(val, &imageRequest.Parameters)
			if err != nil {
				return nil, fmt.Errorf("invalid parameters field: %w", err)
			}
		}
		if val, ok := request.Extra["input"]; ok {
			err := common.Unmarshal(val, &imageRequest.Input)
			if err != nil {
				return nil, fmt.Errorf("invalid input field: %w", err)
			}
		}
	}

	if imageRequest.Parameters == nil {
		imageRequest.Parameters = AliImageParameters{
			Size:      strings.Replace(request.Size, "x", "*", -1),
			N:         int(request.N),
			Watermark: request.Watermark,
		}
	}

	if imageRequest.Input == nil {
		imageRequest.Input = AliImageInput{
			Prompt: request.Prompt,
		}
	}

	return &imageRequest, nil
}

func updateTask(info *relaycommon.RelayInfo, taskID string) (*AliResponse, error, []byte) {
	url := fmt.Sprintf("%s/api/v1/tasks/%s", info.ChannelBaseUrl, taskID)

	var aliResponse AliResponse

	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return &aliResponse, err, nil
	}

	req.Header.Set("Authorization", "Bearer "+info.ApiKey)

	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		common.SysLog("updateTask client.Do err: " + err.Error())
		return &aliResponse, err, nil
	}
	defer resp.Body.Close()

	responseBody, err := io.ReadAll(resp.Body)

	var response AliResponse
	err = common.Unmarshal(responseBody, &response)
	if err != nil {
		common.SysLog("updateTask NewDecoder err: " + err.Error())
		return &aliResponse, err, nil
	}

	return &response, nil, responseBody
}

func asyncTaskWait(c *gin.Context, info *relaycommon.RelayInfo, taskID string) (*AliResponse, []byte, error) {
	waitSeconds := 5
	step := 0
	maxStep := 20

	var taskResponse AliResponse
	var responseBody []byte

	for {
		logger.LogDebug(c, fmt.Sprintf("asyncTaskWait step %d/%d, wait %d seconds", step, maxStep, waitSeconds))
		step++
		rsp, err, body := updateTask(info, taskID)
		responseBody = body
		if err != nil {
			logger.LogWarn(c, "asyncTaskWait UpdateTask err: "+err.Error())
			time.Sleep(time.Duration(waitSeconds) * time.Second)
			continue
		}

		if rsp.Output.TaskStatus == "" {
			return &taskResponse, responseBody, nil
		}

		switch rsp.Output.TaskStatus {
		case "FAILED":
			fallthrough
		case "CANCELED":
			fallthrough
		case "SUCCEEDED":
			fallthrough
		case "UNKNOWN":
			return rsp, responseBody, nil
		}
		if step >= maxStep {
			break
		}
		time.Sleep(time.Duration(waitSeconds) * time.Second)
	}

	return nil, nil, fmt.Errorf("aliAsyncTaskWait timeout")
}

func responseAli2OpenAIImage(c *gin.Context, response *AliResponse, info *relaycommon.RelayInfo, responseFormat string) *dto.ImageResponse {
	imageResponse := dto.ImageResponse{
		Created: info.StartTime.Unix(),
	}

	for _, data := range response.Output.Results {
		var b64Json string
		if responseFormat == "b64_json" {
			_, b64, err := service.GetImageFromUrl(data.Url)
			if err != nil {
				logger.LogError(c, "get_image_data_failed: "+err.Error())
				continue
			}
			b64Json = b64
		} else {
			b64Json = data.B64Image
		}

		imageResponse.Data = append(imageResponse.Data, dto.ImageData{
			Url:           data.Url,
			B64Json:       b64Json,
			RevisedPrompt: "",
		})
	}
	imageResponse.Extra = response
	return &imageResponse
}

func aliImageHandler(c *gin.Context, resp *http.Response, info *relaycommon.RelayInfo) (*types.NewAPIError, *dto.Usage) {
	responseFormat := c.GetString("response_format")

	var aliTaskResponse AliResponse
	responseBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return types.NewOpenAIError(err, types.ErrorCodeReadResponseBodyFailed, http.StatusInternalServerError), nil
	}
	service.CloseResponseBodyGracefully(resp)
	err = json.Unmarshal(responseBody, &aliTaskResponse)
	if err != nil {
		return types.NewOpenAIError(err, types.ErrorCodeBadResponseBody, http.StatusInternalServerError), nil
	}

	if aliTaskResponse.Message != "" {
		logger.LogError(c, "ali_async_task_failed: "+aliTaskResponse.Message)
		return types.NewError(errors.New(aliTaskResponse.Message), types.ErrorCodeBadResponse), nil
	}

	aliResponse, _, err := asyncTaskWait(c, info, aliTaskResponse.Output.TaskId)
	if err != nil {
		return types.NewError(err, types.ErrorCodeBadResponse), nil
	}

	if aliResponse.Output.TaskStatus != "SUCCEEDED" {
		return types.WithOpenAIError(types.OpenAIError{
			Message: aliResponse.Output.Message,
			Type:    "ali_error",
			Param:   "",
			Code:    aliResponse.Output.Code,
		}, resp.StatusCode), nil
	}

	fullTextResponse := responseAli2OpenAIImage(c, aliResponse, info, responseFormat)
	jsonResponse, err := common.Marshal(fullTextResponse)
	if err != nil {
		return types.NewError(err, types.ErrorCodeBadResponseBody), nil
	}
	c.Writer.Header().Set("Content-Type", "application/json")
	c.Writer.WriteHeader(resp.StatusCode)
	c.Writer.Write(jsonResponse)
	return nil, &dto.Usage{}
}