package sora

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"one-api/common"
	"one-api/dto"
	"one-api/model"
	"one-api/relay/channel"
	relaycommon "one-api/relay/common"
	"one-api/service"

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

// ============================
// Request / Response structures
// ============================

type ContentItem struct {
	Type     string    `json:"type"`                // "text" or "image_url"
	Text     string    `json:"text,omitempty"`      // for text type
	ImageURL *ImageURL `json:"image_url,omitempty"` // for image_url type
}

type ImageURL struct {
	URL string `json:"url"`
}

type responsePayload struct {
	ID string `json:"id"` // task_id
}

type responseTask struct {
	ID                 string `json:"id"`
	Object             string `json:"object"`
	Model              string `json:"model"`
	Status             string `json:"status"`
	Progress           int    `json:"progress"`
	CreatedAt          int64  `json:"created_at"`
	CompletedAt        int64  `json:"completed_at,omitempty"`
	ExpiresAt          int64  `json:"expires_at,omitempty"`
	Seconds            string `json:"seconds,omitempty"`
	Size               string `json:"size,omitempty"`
	RemixedFromVideoID string `json:"remixed_from_video_id,omitempty"`
	Error              *struct {
		Message string `json:"message"`
		Code    string `json:"code"`
	} `json:"error,omitempty"`
}

// ============================
// Adaptor implementation
// ============================

type TaskAdaptor struct {
	ChannelType int
	apiKey      string
	baseURL     string
}

func (a *TaskAdaptor) Init(info *relaycommon.RelayInfo) {
	a.ChannelType = info.ChannelType
	a.baseURL = info.ChannelBaseUrl
	a.apiKey = info.ApiKey
}

func (a *TaskAdaptor) ValidateRequestAndSetAction(c *gin.Context, info *relaycommon.RelayInfo) (taskErr *dto.TaskError) {
	return relaycommon.ValidateMultipartDirect(c, info)
}

func (a *TaskAdaptor) BuildRequestURL(info *relaycommon.RelayInfo) (string, error) {
	return fmt.Sprintf("%s/v1/videos", a.baseURL), nil
}

// BuildRequestHeader sets required headers.
func (a *TaskAdaptor) BuildRequestHeader(c *gin.Context, req *http.Request, info *relaycommon.RelayInfo) error {
	req.Header.Set("Authorization", "Bearer "+a.apiKey)
	req.Header.Set("Content-Type", c.Request.Header.Get("Content-Type"))
	return nil
}

func (a *TaskAdaptor) BuildRequestBody(c *gin.Context, info *relaycommon.RelayInfo) (io.Reader, error) {
	cachedBody, err := common.GetRequestBody(c)
	if err != nil {
		return nil, errors.Wrap(err, "get_request_body_failed")
	}
	return bytes.NewReader(cachedBody), nil
}

// DoRequest delegates to common helper.
func (a *TaskAdaptor) DoRequest(c *gin.Context, info *relaycommon.RelayInfo, requestBody io.Reader) (*http.Response, error) {
	return channel.DoTaskApiRequest(a, c, info, requestBody)
}

// DoResponse handles upstream response, returns taskID etc.
func (a *TaskAdaptor) DoResponse(c *gin.Context, resp *http.Response, _ *relaycommon.RelayInfo) (taskID string, taskData []byte, taskErr *dto.TaskError) {
	responseBody, err := io.ReadAll(resp.Body)
	if err != nil {
		taskErr = service.TaskErrorWrapper(err, "read_response_body_failed", http.StatusInternalServerError)
		return
	}
	_ = resp.Body.Close()

	// Parse Sora response
	var dResp responsePayload
	if err := json.Unmarshal(responseBody, &dResp); err != nil {
		taskErr = service.TaskErrorWrapper(errors.Wrapf(err, "body: %s", responseBody), "unmarshal_response_body_failed", http.StatusInternalServerError)
		return
	}

	if dResp.ID == "" {
		taskErr = service.TaskErrorWrapper(fmt.Errorf("task_id is empty"), "invalid_response", http.StatusInternalServerError)
		return
	}

	c.JSON(http.StatusOK, gin.H{"task_id": dResp.ID})
	return dResp.ID, responseBody, nil
}

// FetchTask fetch task status
func (a *TaskAdaptor) FetchTask(baseUrl, key string, body map[string]any) (*http.Response, error) {
	taskID, ok := body["task_id"].(string)
	if !ok {
		return nil, fmt.Errorf("invalid task_id")
	}

	uri := fmt.Sprintf("%s/v1/videos/%s", baseUrl, taskID)

	req, err := http.NewRequest(http.MethodGet, uri, nil)
	if err != nil {
		return nil, err
	}

	req.Header.Set("Authorization", "Bearer "+key)

	return service.GetHttpClient().Do(req)
}

func (a *TaskAdaptor) GetModelList() []string {
	return ModelList
}

func (a *TaskAdaptor) GetChannelName() string {
	return ChannelName
}

func (a *TaskAdaptor) ParseTaskResult(respBody []byte) (*relaycommon.TaskInfo, error) {
	resTask := responseTask{}
	if err := json.Unmarshal(respBody, &resTask); err != nil {
		return nil, errors.Wrap(err, "unmarshal task result failed")
	}

	taskResult := relaycommon.TaskInfo{
		Code: 0,
	}

	switch resTask.Status {
	case "queued", "pending":
		taskResult.Status = model.TaskStatusQueued
	case "processing", "in_progress":
		taskResult.Status = model.TaskStatusInProgress
	case "completed":
		taskResult.Status = model.TaskStatusSuccess
		taskResult.Url = fmt.Sprintf("%s/v1/videos/%s/content", a.baseURL, resTask.ID)
	case "failed", "cancelled":
		taskResult.Status = model.TaskStatusFailure
		if resTask.Error != nil {
			taskResult.Reason = resTask.Error.Message
		} else {
			taskResult.Reason = "task failed"
		}
	default:
	}
	if resTask.Progress > 0 && resTask.Progress < 100 {
		taskResult.Progress = fmt.Sprintf("%d%%", resTask.Progress)
	}

	return &taskResult, nil
}
