import { Component, ChangeDetectorRef, NgZone, OnDestroy, OnInit } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { Subscription } from 'rxjs';
import { JimengService } from '../../../services/jimeng.service';
import { ResultsService } from '../../../services/results.service';
import { PipelineSessionService } from '../../../services/pipeline-session.service';
import { QiniuUploadService } from '../../../services/qiniu-upload.service';
import { SessionBarComponent } from '../../../components/session-bar/session-bar.component';
import { DraftMeta } from '../../../models/pipeline-draft.model';
import { userFriendlyError } from '../../../services/user-message.util';
import { CostEstimatorService } from '../../../services/cost-estimator.service';
import { GenerationTaskService } from '../../../services/generation-task.service';

interface UploadedAsset {
  url: string;
  name: string;
  size: number;
  preview: string;
  type: 'image' | 'video';
}

/** 会话快照：上传后的七牛云 url 可永久化，本地 preview 不存 */
interface AtSnapshot {
  characterImage: { url: string; name: string; size: number } | null;
  referenceVideo: { url: string; name: string; size: number } | null;
  cutFirstSecond: boolean;
  resultVideoUrl: string;
  resultWorkId: string;
}

/**
 * P2: 动作迁移 Pipeline
 *
 * 调用即梦 getActorV2：
 *   image_url + video_url → 角色图按参考视频动作驱动起来。
 *
 * 上传走七牛云直传（云函数签发 token，支持图片/视频）。
 */
@Component({
  selector: 'app-action-transfer',
  standalone: true,
  imports: [CommonModule, FormsModule, SessionBarComponent],
  templateUrl: './action-transfer.component.html',
  styleUrls: ['./action-transfer.component.css'],
})
export class ActionTransferComponent implements OnInit, OnDestroy {
  characterImage: UploadedAsset | null = null;
  referenceVideo: UploadedAsset | null = null;
  /** 是否裁剪结果视频的第 1 秒（即梦默认 true，可关闭） */
  cutFirstSecond = true;

  uploadingSlot: 'image' | 'video' | null = null;
  uploadError = '';
  uploadProgress = 0;

  generating = false;
  progress = 0;
  statusText = '';
  resultVideoUrl = '';
  resultWorkId = '';
  errorMsg = '';

  private genSub?: Subscription;
  private generationTaskId = '';

  constructor(
    private qiniuUpload: QiniuUploadService,
    private jimeng: JimengService,
    private cdr: ChangeDetectorRef,
    private zone: NgZone,
    private results: ResultsService,
    public session: PipelineSessionService,
    private generationTasks: GenerationTaskService,
    private costEstimator: CostEstimatorService,
  ) {}

  ngOnInit(): void {
    void this.session.bootstrap();
    const cur = this.session.active();
    if (cur && cur.pipelineId === 'action-transfer' && cur.snapshot) {
      this.fromSnapshot(cur.snapshot as AtSnapshot);
    }
  }

  // ====== Session ======
  private toSnapshot(): AtSnapshot {
    const stripPreview = (a: UploadedAsset | null) =>
      a ? { url: a.url, name: a.name, size: a.size } : null;
    return {
      characterImage: stripPreview(this.characterImage),
      referenceVideo: stripPreview(this.referenceVideo),
      cutFirstSecond: this.cutFirstSecond,
      resultVideoUrl: this.resultVideoUrl,
      resultWorkId: this.resultWorkId,
    };
  }

  private fromSnapshot(snap: AtSnapshot): void {
    if (!snap) return;
    this.characterImage = snap.characterImage
      ? { ...snap.characterImage, preview: snap.characterImage.url, type: 'image' as const }
      : null;
    this.referenceVideo = snap.referenceVideo
      ? { ...snap.referenceVideo, preview: snap.referenceVideo.url, type: 'video' as const }
      : null;
    this.cutFirstSecond = snap.cutFirstSecond ?? true;
    this.resultVideoUrl = snap.resultVideoUrl ?? '';
    this.resultWorkId = snap.resultWorkId ?? '';
    this.errorMsg = '';
    this.statusText = '';
    this.progress = 0;
    this.cdr.detectChanges();
  }

  private deriveTitle(): string {
    if (this.resultWorkId) return `动作迁移-${this.resultWorkId}`;
    if (this.characterImage?.name) return `动作迁移 · ${this.characterImage.name}`;
    return '动作迁移 · 未命名';
  }

  syncDraft(): void {
    this.session.ensureActive('action-transfer', () => this.toSnapshot(), this.deriveTitle());
    const cur = this.session.active();
    const derived = this.deriveTitle();
    const isAutoTitle = !cur || !cur.title || cur.title === '未命名创作' || cur.title === derived;
    this.session.patch({
      snapshot: this.toSnapshot(),
      ...(isAutoTitle ? { title: derived } : {}),
    });
  }

  onNewSession(): void {
    if (this.generating) return;
    this.cancel();
    if (this.characterImage?.preview) URL.revokeObjectURL(this.characterImage.preview);
    if (this.referenceVideo?.preview) URL.revokeObjectURL(this.referenceVideo.preview);
    this.characterImage = null;
    this.referenceVideo = null;
    this.cutFirstSecond = true;
    this.resultVideoUrl = '';
    this.resultWorkId = '';
    this.errorMsg = '';
    this.statusText = '';
    this.progress = 0;
    this.session.close();
    this.cdr.detectChanges();
  }

  async onOpenSession(meta: DraftMeta): Promise<void> {
    if (this.generating) {
      alert('当前任务运行中，请先取消或等待完成再切换');
      return;
    }
    const draft = await this.session.open(meta.id);
    if (draft?.snapshot) this.fromSnapshot(draft.snapshot as AtSnapshot);
  }

  ngOnDestroy(): void {
    this.genSub?.unsubscribe();
    if (this.characterImage?.preview) URL.revokeObjectURL(this.characterImage.preview);
    if (this.referenceVideo?.preview) URL.revokeObjectURL(this.referenceVideo.preview);
  }

  triggerPick(slot: 'image' | 'video', input: HTMLInputElement): void {
    input.value = '';
    input.click();
  }

  onFilePicked(event: Event, slot: 'image' | 'video'): void {
    const input = event.target as HTMLInputElement;
    const file = input.files?.[0];
    if (!file) return;

    if (slot === 'image' && !file.type.startsWith('image/')) {
      this.uploadError = '角色素材需要图片文件';
      return;
    }
    if (slot === 'video' && !file.type.startsWith('video/')) {
      this.uploadError = '参考素材需要视频文件';
      return;
    }
    const limitMb = slot === 'video' ? 200 : 10;
    if (file.size > limitMb * 1024 * 1024) {
      this.uploadError = `${slot === 'video' ? '视频' : '图片'}大小不能超过 ${limitMb}MB`;
      return;
    }

    this.uploadError = '';
    this.uploadingSlot = slot;
    this.uploadProgress = 0;

    this.qiniuUpload.uploadFileWithProgress(file, file.name, file.type, slot === 'image' ? 'image' : 'video').subscribe({
      next: (event) => {
        if (event.state === 'progress') {
          this.uploadProgress = event.progress;
          this.cdr.detectChanges();
          return;
        }
        const url = event.url || '';
        if (!url) {
          this.uploadError = '上传失败，请检查网络后重试';
          this.uploadingSlot = null;
          this.cdr.detectChanges();
          return;
        }
        const previewUrl = URL.createObjectURL(file);
        const asset: UploadedAsset = {
          url,
          name: file.name,
          size: file.size,
          preview: previewUrl,
          type: slot === 'image' ? 'image' : 'video',
        };
        if (slot === 'image') {
          if (this.characterImage?.preview) URL.revokeObjectURL(this.characterImage.preview);
          this.characterImage = asset;
        } else {
          if (this.referenceVideo?.preview) URL.revokeObjectURL(this.referenceVideo.preview);
          this.referenceVideo = asset;
        }
        this.uploadingSlot = null;
        this.uploadProgress = 0;
        this.cdr.detectChanges();
        this.session.ensureActive('action-transfer', () => this.toSnapshot(), this.deriveTitle());
        this.session.upsertArtifact(
          (a) => a.extras?.['slot'] === slot,
          {
            type: slot === 'image' ? 'image' : 'video',
            url: asset.url,
            title: slot === 'image' ? '角色图片（上传）' : '参考动作视频（上传）',
            extras: { slot },
          },
        );
        this.session.patch({ snapshot: this.toSnapshot() });
      },
      error: (err) => {
        this.uploadError = userFriendlyError(err, '素材上传失败，请检查网络后重试');
        this.uploadingSlot = null;
        this.cdr.detectChanges();
      },
    });
  }

  removeAsset(slot: 'image' | 'video'): void {
    if (slot === 'image') {
      if (this.characterImage?.preview) URL.revokeObjectURL(this.characterImage.preview);
      this.characterImage = null;
    } else {
      if (this.referenceVideo?.preview) URL.revokeObjectURL(this.referenceVideo.preview);
      this.referenceVideo = null;
    }
  }

  get canGenerate(): boolean {
    return !!this.characterImage && !!this.referenceVideo && !this.generating;
  }

  generate(): void {
    if (!this.canGenerate) return;
    this.generating = true;
    this.progress = 0;
    this.statusText = '正在提交任务...';
    this.errorMsg = '';
    this.resultVideoUrl = '';
    this.resultWorkId = '';
    const estimate = this.costEstimator.estimateActionTransfer();
    const task = this.generationTasks.create({
      title: this.deriveTitle(),
      pipelineId: 'action-transfer',
      operation: estimate.operation,
      estimatedCredits: estimate.totalCredits,
      costLines: estimate.lines,
      snapshot: this.toSnapshot(),
      steps: [
        { id: 'prepare', label: '准备素材' },
        { id: 'submit', label: '提交任务' },
        { id: 'poll', label: '等待生成' },
        { id: 'archive', label: '归档结果' },
      ],
    });
    this.generationTaskId = task.id;
    this.generationTasks.markRunning(task.id, 'submit', 5);

    this.session.ensureActive('action-transfer', () => this.toSnapshot(), this.deriveTitle());
    this.session.markRunning();
    this.session.patch({ snapshot: this.toSnapshot(), title: this.deriveTitle() });

    this.genSub = this.jimeng
      .actionTransfer(
        this.characterImage!.url,
        this.referenceVideo!.url,
        { cutFirstSecond: this.cutFirstSecond },
        (status: string, p: number, meta?: Record<string, any>) => {
          this.zone.run(() => {
            if (meta?.['workId']) {
              this.generationTasks.markWaitingExternal(
                this.generationTaskId,
                { workId: String(meta['workId']), routerName: String(meta['routerName'] || '') },
                'poll',
                Math.round(p),
              );
            } else {
              this.generationTasks.markRunning(this.generationTaskId, p >= 15 ? 'poll' : 'submit', Math.round(p));
            }
            this.statusText = status;
            this.progress = Math.round(p);
            this.cdr.detectChanges();
          });
        },
      )
      .subscribe({
        next: (result) => {
          this.zone.run(() => {
            this.resultVideoUrl = result.videoUrl;
            this.resultWorkId = result.workId;
            this.progress = 100;
            this.statusText = '动作迁移完成！';
            this.generating = false;
            this.cdr.detectChanges();
            const extras = { workId: result.workId, cutFirstSecond: this.cutFirstSecond };
            this.session.patch({ snapshot: this.toSnapshot() });
            this.session.finalize(result.videoUrl, extras);
            this.generationTasks.markStepCompleted(this.generationTaskId, 'archive', 100);
            this.generationTasks.markCompleted(this.generationTaskId, result.videoUrl);
            this.results.saveResult({
              type: 'video',
              url: result.videoUrl,
              title: `动作迁移-${result.workId}`,
              pipelineId: 'action_transfer',
              extras,
            }).subscribe();
          });
        },
        error: (err) => {
          this.zone.run(() => {
            console.error('[action-transfer] error', err);
            this.errorMsg = userFriendlyError(err, '动作视频生成失败，请稍后重试');
            this.statusText = '';
            this.generating = false;
            this.cdr.detectChanges();
            this.session.fail(this.errorMsg);
            this.generationTasks.markFailed(this.generationTaskId, err, { retryable: true, recoverable: true });
          });
        },
      });
  }

  cancel(): void {
    this.genSub?.unsubscribe();
    this.generating = false;
    this.statusText = '已取消';
    this.progress = 0;
  }

  reset(): void {
    this.cancel();
    this.resultVideoUrl = '';
    this.resultWorkId = '';
    this.errorMsg = '';
    this.statusText = '';
    this.progress = 0;
  }

  formatSize(bytes: number): string {
    if (bytes < 1024) return `${bytes} B`;
    if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
    return `${(bytes / 1024 / 1024).toFixed(2)} MB`;
  }
}