/**
 * @fileoverview useDigitalHumanGeneration Hook - 数字人生成逻辑
 *
 * 重构后：不管理识别状态，只提供数据和操作方法
 * 状态由 Pipeline 统一管理
 */

import { ref, computed } from 'vue'
import { message } from 'ant-design-vue'
import type {
  VideoState,
  IdentifyResult,
  Video,
} from '../types/identify-face'
import { identifyUploadedVideo, uploadAndIdentifyVideo } from '@/api/kling'
import { useUpload } from '@/composables/useUpload'

export function useDigitalHumanGeneration() {
  // ========== 状态 ==========
  const videoState = ref<VideoState>({
    uploadedVideo: '',
    videoFile: null,
    previewVideoUrl: '',
    selectedVideo: null,
    fileId: null,
    videoSource: null,
    selectorVisible: false,
  })

  // 识别结果数据（不含状态标志）
  const identifyResult = ref<IdentifyResult>({
    sessionId: '',
    faceId: '',
    faceStartTime: 0,
    faceEndTime: 0,
    videoFileId: null,
  })

  const { upload } = useUpload()

  // ========== 计算属性 ==========
  const faceDuration = computed(function() {
    return identifyResult.value.faceEndTime - identifyResult.value.faceStartTime
  })

  const hasVideo = computed(function() {
    return !!videoState.value.uploadedVideo || !!videoState.value.selectedVideo
  })

  const isIdentified = computed(function() {
    return !!identifyResult.value.sessionId
  })

  // ========== 方法 ==========

  async function handleFileUpload(file: File): Promise<void> {
    if (!file.name.match(/\.(mp4|mov)$/i)) {
      message.error('仅支持 MP4 和 MOV')
      return
    }

    // 释放旧的 blob URL
    if (videoState.value.uploadedVideo && videoState.value.uploadedVideo.startsWith('blob:')) {
      URL.revokeObjectURL(videoState.value.uploadedVideo)
    }

    videoState.value.videoFile = file
    videoState.value.uploadedVideo = URL.createObjectURL(file)
    videoState.value.selectedVideo = null
    videoState.value.previewVideoUrl = ''
    videoState.value.videoSource = 'upload'
    resetIdentifyResult()
  }

  async function handleVideoSelect(video: Video): Promise<void> {
    videoState.value.selectedVideo = video
    videoState.value.uploadedVideo = video.fileUrl
    videoState.value.videoFile = null
    videoState.value.videoSource = 'select'
    videoState.value.selectorVisible = false
    resetIdentifyResult()
    identifyResult.value.videoFileId = video.fileId
  }

  /**
   * 执行人脸识别
   * 返回识别结果供 Pipeline 使用
   */
  async function performFaceRecognition(): Promise<IdentifyResult> {
    const hasUploadFile = videoState.value.videoFile
    const hasSelectedVideo = videoState.value.selectedVideo

    if (!hasUploadFile && !hasSelectedVideo) {
      throw new Error('请先选择视频')
    }

    if (hasSelectedVideo) {
      // 从素材库选择：调用识别接口
      const res = await identifyUploadedVideo(hasSelectedVideo) as {
        success: boolean;
        data: { sessionId: string; faceId: string | null; startTime: number; endTime: number }
      }
      identifyResult.value.videoFileId = hasSelectedVideo.fileId
      identifyResult.value.sessionId = res.data.sessionId
      identifyResult.value.faceId = res.data.faceId || ''
      identifyResult.value.faceStartTime = res.data.startTime || 0
      identifyResult.value.faceEndTime = res.data.endTime || 0
    } else {
      // 上传新视频：使用 uploadAndIdentifyVideo 完成上传+识别
      const file = hasUploadFile!
      const res = await uploadAndIdentifyVideo(file) as {
        success: boolean;
        data: { fileId: string; sessionId: string; faceId: string | null; startTime: number; endTime: number }
      }

      identifyResult.value.videoFileId = res.data.fileId
      identifyResult.value.sessionId = res.data.sessionId
      identifyResult.value.faceId = res.data.faceId || ''
      identifyResult.value.faceStartTime = res.data.startTime || 0
      identifyResult.value.faceEndTime = res.data.endTime || 0
    }

    return { ...identifyResult.value }
  }

  function resetVideoState(): void {
    // 释放 blob URL 避免内存泄漏
    if (videoState.value.uploadedVideo && videoState.value.uploadedVideo.startsWith('blob:')) {
      URL.revokeObjectURL(videoState.value.uploadedVideo)
    }
    videoState.value.uploadedVideo = ''
    videoState.value.videoFile = null
    videoState.value.selectedVideo = null
    videoState.value.fileId = null
    videoState.value.videoSource = null
    videoState.value.previewVideoUrl = ''
    videoState.value.selectorVisible = false
    resetIdentifyResult()
  }

  function getVideoPreviewUrl(video: Video): string {
    if (video.coverBase64) {
      return video.coverBase64.startsWith('data:')
        ? video.coverBase64
        : `data:image/jpeg;base64,${video.coverBase64}`
    }
    if (video.previewUrl) return video.previewUrl
    if (video.coverUrl) return video.coverUrl
    return 'data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMjAwIiBoZWlnaHQ9IjExMCIgdmlld0JveD0iMCAwIDIwMCAxMTAiIGZpbGw9Im5vbmUiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+CjxyZWN0IHdpZHRoPSIyMDAiIGhlaWdodD0iMTEwIiBmaWxsPSIjMzc0MTUxIi8+CjxwYXRoIGQ9Ik04NSA0NUwxMTUgNjVMMTA1IDg1TDc1IDc1TDg1IDQ1WiIgZmlsbD0iIzU3MjY1MSIvPgo8L3N2Zz4K'
  }

  function resetIdentifyResult(): void {
    identifyResult.value.sessionId = ''
    identifyResult.value.faceId = ''
    identifyResult.value.videoFileId = null
  }

  return {
    videoState,
    identifyResult,
    hasVideo,
    isIdentified,
    faceDuration,
    handleFileUpload,
    handleVideoSelect,
    performFaceRecognition,
    resetVideoState,
    resetIdentifyResult,
    getVideoPreviewUrl,
  }
}