// 视频重绘接口处理器，负责重绘工作台、分析任务和源媒体上传请求。
package handler

import (
	"errors"
	"fmt"
	"net/http"
	"path/filepath"
	"strings"

	mediakey "juhe-factory/api/internal/media"
	"juhe-factory/api/internal/service"

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

func (h *Creative) GetRedrawWorkbench(c *gin.Context) {
	projectID, ok := h.projectID(c)
	if !ok {
		return
	}
	data, err := h.service.GetRedrawWorkbench(currentWebUser(c).ID, projectID)
	if err != nil {
		h.respondError(c, err)
		return
	}
	c.JSON(http.StatusOK, gin.H{"data": data})
}

func (h *Creative) GetRedrawEpisodeWorkbench(c *gin.Context) {
	projectID, ok := h.projectID(c)
	if !ok {
		return
	}
	episodeID, err := service.ParseUUID(c.Param("episode_id"), "剧集")
	if err != nil {
		h.bad(c, err)
		return
	}
	data, err := h.service.GetRedrawEpisodeWorkbench(currentWebUser(c).ID, projectID, episodeID)
	if err != nil {
		h.respondError(c, err)
		return
	}
	c.JSON(http.StatusOK, gin.H{"data": data})
}

func (h *Creative) QueueRedrawEpisodeScript(c *gin.Context) {
	projectID, ok := h.projectID(c)
	if !ok {
		return
	}
	episodeID, err := service.ParseUUID(c.Param("episode_id"), "剧集")
	if err != nil {
		h.bad(c, err)
		return
	}
	task, err := h.service.QueueRedrawEpisodeScript(currentWebUser(c).ID, projectID, episodeID)
	if err != nil {
		h.respondError(c, err)
		return
	}
	c.JSON(http.StatusAccepted, gin.H{"data": task})
}

// SaveRedrawEpisodeScript 保存用户修改后的剧集反推剧本正文。
func (h *Creative) SaveRedrawEpisodeScript(c *gin.Context) {
	projectID, ok := h.projectID(c)
	if !ok {
		return
	}
	episodeID, err := service.ParseUUID(c.Param("episode_id"), "剧集")
	if err != nil {
		h.bad(c, err)
		return
	}
	var body struct {
		Content string `json:"content"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		h.bad(c, err)
		return
	}
	if err := h.service.SaveRedrawEpisodeScript(currentWebUser(c).ID, projectID, episodeID, body.Content); err != nil {
		h.respondError(c, err)
		return
	}
	c.Status(http.StatusNoContent)
}

func (h *Creative) UpdateRedrawAnalysisSettings(c *gin.Context) {
	projectID, ok := h.projectID(c)
	if !ok {
		return
	}
	var body struct {
		AudioSource    string `json:"audio_source"`
		SourceLanguage string `json:"source_language"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		h.bad(c, err)
		return
	}
	if err := h.service.UpdateRedrawAnalysisSettings(currentWebUser(c).ID, projectID, body.AudioSource, body.SourceLanguage); err != nil {
		h.respondError(c, err)
		return
	}
	c.Status(http.StatusNoContent)
}

func (h *Creative) QueueRedrawAnalysis(c *gin.Context) {
	projectID, ok := h.projectID(c)
	if !ok {
		return
	}
	task, err := h.service.QueueRedrawAnalysis(currentWebUser(c).ID, projectID)
	if err != nil {
		h.respondError(c, err)
		return
	}
	c.JSON(http.StatusAccepted, gin.H{"data": task})
}

func (h *Creative) ReanalyzeRedraw(c *gin.Context) {
	if !h.objectStorageAvailable(c) {
		return
	}
	projectID, ok := h.projectID(c)
	if !ok {
		return
	}
	objectKeys, err := h.service.ResetRedrawAnalysis(currentWebUser(c).ID, projectID)
	if err != nil {
		h.respondError(c, err)
		return
	}
	if !h.deleteStoredObjects(c, objectKeys) {
		return
	}
	task, err := h.service.QueueRedrawAnalysis(currentWebUser(c).ID, projectID)
	if err != nil {
		h.respondError(c, err)
		return
	}
	c.JSON(http.StatusAccepted, gin.H{"data": task})
}

func (h *Creative) QueueRedrawStoryboardAnalysis(c *gin.Context) {
	projectID, ok := h.projectID(c)
	if !ok {
		return
	}
	storyboardID, err := service.ParseUUID(c.Param("storyboard_id"), "分镜")
	if err != nil {
		h.bad(c, err)
		return
	}
	task, err := h.service.QueueRedrawStoryboardAnalysis(currentWebUser(c).ID, projectID, storyboardID)
	if err != nil {
		h.respondError(c, err)
		return
	}
	c.JSON(http.StatusAccepted, gin.H{"data": task})
}

func (h *Creative) QueueRedrawScript(c *gin.Context) {
	projectID, ok := h.projectID(c)
	if !ok {
		return
	}
	task, err := h.service.QueueRedrawScript(currentWebUser(c).ID, projectID)
	if err != nil {
		h.respondError(c, err)
		return
	}
	c.JSON(http.StatusAccepted, gin.H{"data": task})
}

func (h *Creative) UploadRedrawSource(c *gin.Context) {
	h.uploadRedrawMedia(c, "source")
}

func (h *Creative) UploadRedrawSubtitle(c *gin.Context) {
	h.uploadRedrawMedia(c, "subtitle")
}

func (h *Creative) uploadRedrawMedia(c *gin.Context, kind string) {
	if h.cos == nil {
		fail(c, http.StatusServiceUnavailable, "cos_not_configured", "COS 对象存储未配置")
		return
	}
	projectID, ok := h.projectID(c)
	if !ok {
		return
	}
	target, err := h.service.PrepareRedrawMediaUpload(currentWebUser(c).ID, projectID, kind)
	if err != nil {
		h.respondError(c, err)
		return
	}
	project := target.Project
	file, header, err := c.Request.FormFile("file")
	if err != nil {
		h.bad(c, errors.New("请选择文件"))
		return
	}
	defer file.Close()
	contentType := cleanContentType(header.Header.Get("Content-Type"))
	maxBytes := int64(50 * 1024 * 1024)
	ext := strings.ToLower(filepath.Ext(header.Filename))
	allowedVideoTypes := map[string]bool{"video/mp4": true, "video/webm": true, "video/quicktime": true, "video/x-m4v": true}
	allowed := allowedVideoTypes[contentType] && map[string]bool{".mp4": true, ".webm": true, ".mov": true, ".m4v": true}[ext]
	if kind == "subtitle" {
		maxBytes = 2 * 1024 * 1024
		allowed = ext == ".srt" || ext == ".vtt" || ext == ".txt"
		if contentType == "" {
			contentType = "text/plain"
		}
	}
	if !allowed || header.Size <= 0 || header.Size > maxBytes {
		h.bad(c, fmt.Errorf("%s文件格式或大小不符合要求", map[bool]string{true: "字幕", false: "视频"}[kind == "subtitle"]))
		return
	}
	oldMediaID := target.OldMediaID
	if kind == "source" && project.SourceVideoAssetID != nil {
		objectKeys, err := h.service.ResetRedrawAnalysis(currentWebUser(c).ID, projectID)
		if err != nil {
			h.respondError(c, err)
			return
		}
		if !h.deleteStoredObjects(c, objectKeys) {
			return
		}
	}
	mediaID := uuid.New()
	key := mediakey.ProjectSource(projectID, mediaID, header.Filename, contentType)
	displayName := project.Name + "原视频"
	if kind == "subtitle" {
		key = mediakey.ProjectSubtitle(projectID, mediaID, header.Filename, contentType)
		displayName = project.Name + "字幕"
	}
	asset, err := h.storeUpload(c, mediaID, currentWebUser(c).ID, file, header, key, displayName, contentType, nil)
	if err != nil {
		h.internal(c, err)
		return
	}
	if err := h.service.PersistRedrawMediaUpload(projectID, kind, project.RedrawStatus, asset, oldMediaID); err != nil {
		_ = h.cos.Delete(c.Request.Context(), asset.ObjectKey)
		h.internal(c, err)
		return
	}
	if target.OldObjectKey != "" && !h.deleteStoredObjects(c, []string{target.OldObjectKey}) {
		return
	}
	c.JSON(http.StatusCreated, gin.H{"data": asset})
}