import { useRef, useState, useEffect, useCallback } from 'react';
import type { GenerationTask } from '../types';
import { useGenerationStore } from '../store/generation';
import { showToast } from './Toast';
import { ConfirmModal } from './ConfirmModal';
import styles from './GenerationCard.module.css';

const EditIcon = () => (
  <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round">
    <path d="M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7" />
    <path d="M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z" />
  </svg>
);

const RefreshIcon = () => (
  <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round">
    <polyline points="23 4 23 10 17 10" />
    <path d="M20.49 15a9 9 0 1 1-2.12-9.36L23 10" />
  </svg>
);

const VideoIcon = () => (
  <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
    <polygon points="23 7 16 12 23 17 23 7" />
    <rect x="1" y="5" width="15" height="14" rx="2" ry="2" />
  </svg>
);

const DownloadIcon = () => (
  <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round">
    <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4" />
    <polyline points="7 10 12 15 17 10" />
    <line x1="12" y1="15" x2="12" y2="3" />
  </svg>
);

interface Props {
  task: GenerationTask;
  onOpenDetail?: (task: GenerationTask) => void;
}

export function GenerationCard({ task, onOpenDetail }: Props) {
  const removeTask = useGenerationStore((s) => s.removeTask);
  const reEdit = useGenerationStore((s) => s.reEdit);
  const regenerate = useGenerationStore((s) => s.regenerate);

  const videoRef = useRef<HTMLVideoElement>(null);
  const moreRef = useRef<HTMLDivElement>(null);
  const promptLineRef = useRef<HTMLDivElement>(null);
  const promptWrapperRef = useRef<HTMLDivElement>(null);
  const labelsRef = useRef<HTMLSpanElement>(null);
  const [videoHover, setVideoHover] = useState(false);
  const [promptHover, setPromptHover] = useState(false);
  const [showMore, setShowMore] = useState(false);
  const [truncatedPrompt, setTruncatedPrompt] = useState(task.prompt);
  const [confirmDelete, setConfirmDelete] = useState(false);
  const [detailHover, setDetailHover] = useState(false);
  const [detailPos, setDetailPos] = useState({ top: 0, right: 0 });
  const [promptAbove, setPromptAbove] = useState(false);
  const detailLinkRef = useRef<HTMLSpanElement>(null);

  // Close more menu on click outside
  useEffect(() => {
    if (!showMore) return;
    const handler = (e: MouseEvent) => {
      if (moreRef.current && !moreRef.current.contains(e.target as Node)) {
        setShowMore(false);
      }
    };
    document.addEventListener('mousedown', handler);
    return () => document.removeEventListener('mousedown', handler);
  }, [showMore]);

  // JS-level prompt truncation: ensure labels always visible at end of line 2
  const computeTruncation = useCallback(() => {
    const container = promptLineRef.current;
    const labelsEl = labelsRef.current;
    if (!container || !labelsEl) return;

    const containerWidth = container.offsetWidth;
    if (containerWidth === 0) return;

    const style = getComputedStyle(container);
    const font = `${style.fontSize} ${style.fontFamily}`;

    // Measure labels width
    const labelsWidth = labelsEl.offsetWidth + 8; // +8 for gap

    // Two lines of available width, minus labels on line 2, with safety margin
    const totalAvailable = containerWidth * 2 - labelsWidth - 24;

    const canvas = document.createElement('canvas');
    const ctx = canvas.getContext('2d')!;
    ctx.font = font;

    const prompt = task.prompt || '';
    let totalWidth = 0;
    let needsTruncation = false;

    // Check if prompt fits
    const fullWidth = ctx.measureText(prompt).width;
    if (fullWidth <= totalAvailable) {
      setTruncatedPrompt(prompt);
      return;
    }

    // Truncate character by character
    let truncated = '';
    const ellipsisWidth = ctx.measureText('…').width;
    for (const char of prompt) {
      const charWidth = ctx.measureText(char).width;
      if (totalWidth + charWidth + ellipsisWidth > totalAvailable) {
        needsTruncation = true;
        break;
      }
      truncated += char;
      totalWidth += charWidth;
    }

    setTruncatedPrompt(needsTruncation ? truncated + '…' : prompt);
  }, [task.prompt]);

  useEffect(() => {
    computeTruncation();

    const container = promptLineRef.current;
    if (!container) return;
    const ro = new ResizeObserver(() => computeTruncation());
    ro.observe(container);
    return () => ro.disconnect();
  }, [computeTruncation]);

  const isGenerating = task.status === 'generating';
  const hasResult = task.status === 'completed' && !!task.resultUrl;

  const handleVideoMouseEnter = () => {
    setVideoHover(true);
    const v = videoRef.current;
    if (!v) return;
    v.muted = false;
    v.play().catch(() => {
      // Browser blocks unmuted autoplay — fallback to muted
      v.muted = true;
      v.play().catch(() => {});
    });
  };

  const handleVideoMouseLeave = () => {
    setVideoHover(false);
    const v = videoRef.current;
    if (!v) return;
    v.pause();
    v.currentTime = 0;
  };

  const handleDownload = async (e: React.MouseEvent) => {
    e.stopPropagation();
    if (!task.resultUrl) return;
    try {
      const res = await fetch(task.resultUrl);
      const blob = await res.blob();
      const blobUrl = URL.createObjectURL(blob);
      const a = document.createElement('a');
      a.href = blobUrl;
      a.download = `airdrama-${task.id}.mp4`;
      document.body.appendChild(a);
      a.click();
      document.body.removeChild(a);
      setTimeout(() => URL.revokeObjectURL(blobUrl), 10000);
    } catch {
      const a = document.createElement('a');
      a.href = task.resultUrl;
      a.download = `airdrama-${task.id}.mp4`;
      a.click();
    }
  };

  const handleCopyPrompt = (e: React.MouseEvent) => {
    e.stopPropagation();
    navigator.clipboard.writeText(task.prompt).then(() => {
      showToast('已复制');
    });
  };

  const handleVideoClick = () => {
    if (hasResult && onOpenDetail) {
      onOpenDetail(task);
    }
  };

  return (
    <div className={styles.card}>
      {/* Header: reference thumbnails + prompt + meta labels */}
      <div className={styles.header}>
        {/* Left: reference thumbnails */}
        {task.references.length > 0 && (
          <div className={styles.refColumn}>
            {task.references.map((ref) => (
              <div key={ref.id} className={styles.refThumb}>
                {ref.type === 'video' ? (
                  <video src={ref.previewUrl} className={styles.refMedia} muted />
                ) : ref.type === 'audio' ? (
                  <div className={styles.audioThumb}>
                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round">
                      <path d="M9 18V5l12-2v13" />
                      <circle cx="6" cy="18" r="3" />
                      <circle cx="18" cy="16" r="3" />
                    </svg>
                  </div>
                ) : (
                  <img src={ref.previewUrl} alt={ref.label} className={styles.refMedia} />
                )}
              </div>
            ))}
          </div>
        )}
        {/* Right: prompt + inline labels */}
        <div className={styles.headerRight}>
          <div
            ref={promptWrapperRef}
            className={styles.promptWrapper}
            onMouseLeave={() => setPromptHover(false)}
          >
            <div ref={promptLineRef} className={styles.promptLine}>
              <span
                onMouseEnter={() => {
                  const el = promptWrapperRef.current;
                  if (el) {
                    const rect = el.getBoundingClientRect();
                    setPromptAbove(rect.bottom + 350 > window.innerHeight);
                  }
                  setPromptHover(true);
                }}
              >{truncatedPrompt || '(无文字描述)'}</span>
              <span ref={labelsRef} className={styles.labelsInline} onMouseEnter={() => setPromptHover(false)}>
                <span className={styles.label}>
                  {task.model === 'seedance_2.0' ? 'AirDrama' : 'AirDrama Fast'}
                </span>
                <span className={styles.label}>{task.duration}s</span>
                <span className={styles.label}>{task.aspectRatio}</span>
                <span
                  ref={detailLinkRef}
                  className={styles.detailLink}
                  onMouseEnter={() => {
                    const el = detailLinkRef.current;
                    if (el) {
                      const rect = el.getBoundingClientRect();
                      setDetailPos({
                        top: rect.bottom + 8,
                        right: window.innerWidth - rect.right,
                      });
                    }
                    setDetailHover(true);
                  }}
                  onMouseLeave={() => setDetailHover(false)}
                >
                  详细信息 ⓘ
                  {detailHover && (
                    <div className={styles.detailTooltip} style={{ top: detailPos.top, right: detailPos.right }}>
                      <div className={styles.detailRow}>
                        <span>视频比例</span><span>{task.aspectRatio}</span>
                      </div>
                      <div className={styles.detailRow}>
                        <span>时长</span><span>{task.duration}s</span>
                      </div>
                      <div className={styles.detailRow}>
                        <span>分辨率</span><span>720p</span>
                      </div>
                      <div className={styles.detailRow}>
                        <span>模型</span>
                        <span>{task.model === 'seedance_2.0' ? 'AirDrama' : 'AirDrama Fast'}</span>
                      </div>
                      <div className={styles.detailRow}>
                        <span>生成时间</span>
                        <span>{new Date(task.createdAt).toLocaleString('zh-CN')}</span>
                      </div>
                    </div>
                  )}
                </span>
              </span>
            </div>
            {promptHover && task.prompt && (
              <div className={`${styles.promptTooltip} ${promptAbove ? styles.promptTooltipAbove : ''}`}>
                <p className={styles.promptTooltipText}>{task.prompt}</p>
                <button className={styles.copyBtn} onClick={handleCopyPrompt}>复制</button>
              </div>
            )}
          </div>
        </div>
      </div>

      {/* Video / result area */}
      <div className={styles.content}>
        {isGenerating ? (
          <div className={styles.resultArea}>
            <div className={styles.shimmerBg} />
            <div className={styles.generating}>
              <div className={styles.loadingSpinner} />
              <span className={styles.loadingText}>视频生成中…</span>
              <div className={styles.progressBar}>
                <div
                  className={styles.progressFill}
                  style={{ width: `${task.progress}%` }}
                />
              </div>
              <span className={styles.progressText}>{Math.round(task.progress)}%</span>
            </div>
          </div>
        ) : task.status === 'failed' ? (
          <p className={styles.errorText}>{task.errorMessage || '生成失败，请重试'}</p>
        ) : task.resultUrl ? (
          <div
            className={styles.resultArea}
            onMouseEnter={handleVideoMouseEnter}
            onMouseLeave={handleVideoMouseLeave}
            onClick={handleVideoClick}
            style={{ cursor: 'pointer' }}
          >
            <video
              ref={videoRef}
              src={task.resultUrl}
              className={styles.resultMedia}
              loop
              preload="metadata"
            />
            {videoHover && (
              <div className={styles.videoOverlay}>
                <button className={styles.downloadBtn} onClick={handleDownload}>
                  <DownloadIcon />
                </button>
              </div>
            )}
          </div>
        ) : (
          <div className={styles.resultArea}>
            <div className={styles.resultPlaceholder}>
              <VideoIcon />
              <span>视频已生成</span>
            </div>
          </div>
        )}
      </div>

      {/* Bottom action buttons */}
      {!isGenerating && (
        <div className={styles.actions}>
          <button className={styles.actionBtn} onClick={() => reEdit(task.id)}>
            <EditIcon /> <span>重新编辑</span>
          </button>
          <button className={styles.actionBtn} onClick={() => regenerate(task.id)}>
            <RefreshIcon /> <span>再次生成</span>
          </button>
          <div className={styles.moreMenu} ref={moreRef}>
            <button className={styles.moreBtn} onClick={() => setShowMore(!showMore)}>
              <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor">
                <circle cx="5" cy="12" r="2" />
                <circle cx="12" cy="12" r="2" />
                <circle cx="19" cy="12" r="2" />
              </svg>
            </button>
            {showMore && (
              <div className={styles.moreDropdown}>
                <button onClick={() => { setConfirmDelete(true); setShowMore(false); }}>
                  <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round">
                    <polyline points="3 6 5 6 21 6" />
                    <path d="M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6m3 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2" />
                  </svg>
                  删除
                </button>
              </div>
            )}
          </div>
        </div>
      )}

      <ConfirmModal
        open={confirmDelete}
        title="删除视频"
        message="确定要删除这条生成记录吗？此操作不可撤销。"
        confirmText="删除"
        danger
        onConfirm={() => { removeTask(task.id); setConfirmDelete(false); }}
        onCancel={() => setConfirmDelete(false)}
      />
    </div>
  );
}