// visuals.jsx - reusable visual elements

const _thumbCache = new Map();

function AssetThumb({ asset, size = 'md' }) {
  const aspect = size === 'tall' ? '9 / 16' : '16 / 9';
  const [thumbUrl, setThumbUrl] = React.useState(_thumbCache.get(asset.id) || null);

  React.useEffect(() => {
    if (!asset.id || thumbUrl || !asset.thumbnail_s3_key) return;
    let cancelled = false;
    fetch((window.ZAMPP_API_PREFIX || '/api/v1') + '/assets/' + asset.id + '/thumbnail', { credentials: 'include' })
      .then(r => r.ok ? r.json() : null)
      .then(d => { if (!cancelled && d && d.url) { _thumbCache.set(asset.id, d.url); setThumbUrl(d.url); } })
      .catch(() => {});
    return () => { cancelled = true; };
  }, [asset.id, asset.thumbnail_s3_key]);

  if (asset.type === 'audio' || asset.media_type === 'audio') {
    return (
      <div className="asset-thumb audio" style={{ aspectRatio: aspect }}>
        <Waveform seed={asset.id ? asset.id.charCodeAt(0) % 60 : 1} />
        <div className="thumb-overlay"><Icon name="audio" size={20} style={{ opacity: 0.9 }} /></div>
      </div>
    );
  }

  // Live/recording assets: show a muted HLS live preview instead of a black
  // box. The capture container writes HLS segments to /live/<id>/index.m3u8
  // while recording is in progress; no thumbnail_s3_key exists yet.
  if (asset.status === 'live' && asset.id) {
    return <LiveThumb assetId={asset.id} aspect={aspect} />;
  }

  const altText = asset.name ? `Thumbnail for ${asset.name}` : 'Asset thumbnail';
  return (
    <div className="asset-thumb" style={{ background: 'var(--bg-2)', aspectRatio: aspect, overflow: 'hidden', position: 'relative' }}>
      {thumbUrl
        ? <img src={thumbUrl} alt={altText} style={{ width: '100%', height: '100%', objectFit: 'cover', display: 'block' }} />
        : <FauxFrame />}
    </div>
  );
}

// Muted inline HLS preview for a live/recording asset tile. Attaches hls.js
// (or native HLS on Safari) to show the live feed inside the library card.
// Shows a "connecting…" spinner while the manifest loads, falls back to a
// placeholder with a record icon if hls.js is unavailable or playback fails.
function LiveThumb({ assetId, aspect }) {
  const videoRef = React.useRef(null);
  const [ready, setReady] = React.useState(false);
  const [failed, setFailed] = React.useState(false);

  React.useEffect(() => {
    const v = videoRef.current;
    if (!v || !assetId) return;
    const url = '/live/' + assetId + '/index.m3u8';
    let destroyed = false;
    let hls = null;
    let retryTimer = 0;
    let retryCount = 0;
    const MAX_RETRIES = 6;

    const clearRetry = () => { if (retryTimer) { clearTimeout(retryTimer); retryTimer = 0; } };

    if (v.canPlayType('application/vnd.apple.mpegurl')) {
      const tryLoad = () => {
        if (destroyed) return;
        v.removeAttribute('src');
        v.load();
        v.src = url;
        v.play().catch(() => {});
      };
      v.addEventListener('playing', () => { if (!destroyed) { retryCount = 0; setReady(true); } });
      v.addEventListener('error', () => {
        if (destroyed || retryCount >= MAX_RETRIES) { setFailed(true); return; }
        retryCount++;
        clearRetry();
        retryTimer = setTimeout(tryLoad, Math.min(1000 * retryCount, 8000));
      });
      tryLoad();
      return () => { destroyed = true; clearRetry(); };
    }

    if (!window.Hls) { setFailed(true); return; }

    const startHls = () => {
      if (destroyed) return;
      hls = new window.Hls({ liveSyncDurationCount: 2, lowLatencyMode: true, maxBufferLength: 10 });
      hls.loadSource(url);
      hls.attachMedia(v);
      hls.on(window.Hls.Events.MANIFEST_PARSED, () => {
        if (!destroyed) { retryCount = 0; setReady(true); v.play().catch(() => {}); }
      });
      hls.on(window.Hls.Events.ERROR, (_e, data) => {
        if (!data.fatal) return;
        try { hls.destroy(); } catch (_) {}
        hls = null;
        if (destroyed || retryCount >= MAX_RETRIES) { setFailed(true); return; }
        retryCount++;
        clearRetry();
        retryTimer = setTimeout(startHls, Math.min(1000 * retryCount, 8000));
      });
    };

    startHls();
    return () => { destroyed = true; clearRetry(); if (hls) { try { hls.destroy(); } catch (_) {} } };
  }, [assetId]);

  return (
    <div className="asset-thumb" style={{ aspectRatio: aspect, position: 'relative', background: '#000', overflow: 'hidden' }}>
      <video
        ref={videoRef}
        muted
        playsInline
        autoPlay
        style={{ width: '100%', height: '100%', objectFit: 'cover', display: 'block' }}
      />
      {/* Pulsing red border while connecting or playing, matches LIVE badge colour */}
      <div style={{ position: 'absolute', inset: 0, border: '2px solid var(--live)', pointerEvents: 'none', borderRadius: 'inherit' }} />
      {!ready && !failed && (
        <div style={{ position: 'absolute', inset: 0, display: 'flex', flexDirection: 'column',
                      alignItems: 'center', justifyContent: 'center', gap: 6,
                      background: 'rgba(0,0,0,0.55)', color: 'var(--text-3)', fontSize: 11 }}>
          <Icon name="record" size={18} style={{ color: 'var(--live)', opacity: 0.9 }} />
          <span>Connecting…</span>
        </div>
      )}
      {failed && (
        <div style={{ position: 'absolute', inset: 0, display: 'flex', flexDirection: 'column',
                      alignItems: 'center', justifyContent: 'center', gap: 6,
                      background: 'rgba(0,0,0,0.55)', color: 'var(--text-3)', fontSize: 11 }}>
          <Icon name="record" size={18} style={{ color: 'var(--live)', opacity: 0.7 }} />
          <span>Recording…</span>
        </div>
      )}
    </div>
  );
}

function FauxFrame({ seed }) {
  return <div className="thumb-svg" style={{ background: 'var(--bg-1)' }} />;
}

function Waveform({ seed = 1, color = 'var(--accent)', className = '' }) {
  const bars = 60;
  const pts = React.useMemo(() => {
    return Array.from({ length: bars }).map((_, i) => {
      const n = Math.sin(i * 0.7 + seed) * 0.5 + Math.sin(i * 2.1 + seed * 1.3) * 0.3 + Math.sin(i * 4.3 + seed * 0.7) * 0.2;
      return Math.max(0.1, Math.min(1, 0.5 + n * 0.5));
    });
  }, [seed]);
  return (
    <svg viewBox="0 0 60 20" preserveAspectRatio="none" className={'waveform ' + className}>
      {pts.map((p, i) => (
        <rect key={i} x={i} y={10 - p * 9} width="0.6" height={p * 18} fill={color} rx="0.3" />
      ))}
    </svg>
  );
}

function LiveStrip({ seed = 1, count = 8 }) {
  return (
    <div className="live-strip">
      {Array.from({ length: count }).map((_, i) => (
        <div key={i} className="live-strip-cell" style={{ background: 'var(--bg-1)' }} />
      ))}
      <div className="live-strip-now"><span className="live-pulse" />NOW</div>
    </div>
  );
}

function Sparkline({ data, color = 'var(--accent)', height = 28, fill = true }) {
  const max = Math.max(...data, 1);
  const min = Math.min(...data, 0);
  const range = max - min || 1;
  const w = 100;
  const pts = data.map((d, i) => {
    const x = (i / (data.length - 1)) * w;
    const y = height - ((d - min) / range) * height;
    return x + ',' + y;
  }).join(' ');
  const area = '0,' + height + ' ' + pts + ' ' + w + ',' + height;
  return (
    <svg viewBox={'0 0 ' + w + ' ' + height} preserveAspectRatio="none" style={{ width: '100%', height, display: 'block' }}>
      {fill && <polygon points={area} fill={color} opacity="0.15" />}
      <polyline points={pts} fill="none" stroke={color} strokeWidth="1.5" />
    </svg>
  );
}

function AudioMeter({ level = 0.7, peak = 0.85, vertical = false }) {
  const segs = 20;
  return (
    <div className={'audio-meter ' + (vertical ? 'v' : 'h')}>
      {Array.from({ length: segs }).map((_, i) => {
        const v = i / segs;
        const on = v < level;
        const color = v < 0.6 ? 'var(--success)' : v < 0.85 ? 'var(--warning)' : 'var(--danger)';
        return <div key={i} className="audio-seg" style={{ background: on ? color : 'var(--bg-3)', opacity: on ? 1 : 0.4 }} />;
      })}
    </div>
  );
}

function StatusDot({ status }) {
  const map = {
    online: { color: 'var(--success)', pulse: false },
    recording: { color: 'var(--live)', pulse: true },
    armed: { color: 'var(--accent)', pulse: false },
    idle: { color: 'var(--text-4)', pulse: false },
    error: { color: 'var(--danger)', pulse: true },
    offline: { color: 'var(--text-4)', pulse: false },
    processing: { color: 'var(--warning)', pulse: true },
    ready: { color: 'var(--success)', pulse: false },
    live: { color: 'var(--live)', pulse: true },
    queued: { color: 'var(--text-3)', pulse: false },
    running: { color: 'var(--accent)', pulse: true },
    done: { color: 'var(--success)', pulse: false },
    failed: { color: 'var(--danger)', pulse: false },
    stopped: { color: 'var(--text-4)', pulse: false },
  };
  const s = map[status] || { color: 'var(--text-3)' };
  return <span className={'status-dot ' + (s.pulse ? 'pulse' : '')} style={{ background: s.color, boxShadow: '0 0 0 3px ' + s.color + '30' }} />;
}

function Elapsed({ seconds, live = false }) {
  const [t, setT] = React.useState(seconds);
  React.useEffect(() => {
    if (!live) return;
    const i = setInterval(() => setT(x => x + 1), 1000);
    return () => clearInterval(i);
  }, [live]);
  const h = Math.floor(t / 3600);
  const m = Math.floor((t % 3600) / 60);
  const s = t % 60;
  return <span className="mono">{String(h).padStart(2,'0')}:{String(m).padStart(2,'0')}:{String(s).padStart(2,'0')}</span>;
}

// ─────────────────────────────────────────────────────────────────────────
// ConfirmModal + useConfirm — in-page replacement for window.confirm().
//
// Usage in a component:
//   const [confirm, confirmModal] = useConfirm();
//   ...
//   if (!(await confirm({ title: 'Delete user?', message: '…' }))) return;
//   ...
//   return (<>{confirmModal}  ...rest of UI... </>);
//
// confirm(opts) returns a Promise<boolean>. Options:
//   title, message, confirmLabel (default 'Delete'), cancelLabel ('Cancel'),
//   danger (default true → red confirm button).
function ConfirmModal({ title, message, confirmLabel = 'Delete', cancelLabel = 'Cancel', danger = true, onConfirm, onCancel }) {
  React.useEffect(() => {
    const onKey = (e) => {
      if (e.key === 'Escape') onCancel();
      else if (e.key === 'Enter') onConfirm();
    };
    window.addEventListener('keydown', onKey);
    return () => window.removeEventListener('keydown', onKey);
  }, [onConfirm, onCancel]);

  return (
    <div className="modal-backdrop" onClick={onCancel}>
      <div className="modal" onClick={(e) => e.stopPropagation()} style={{ maxWidth: 440 }}>
        <div className="modal-head">
          <div style={{ fontSize: 15, fontWeight: 600 }}>{title}</div>
          <button className="icon-btn" aria-label="Close" onClick={onCancel}><Icon name="x" /></button>
        </div>
        <div className="modal-body">
          {typeof message === 'string'
            ? message.split('\n').map((line, i) => (
                <div key={i} style={{ fontSize: 13, color: 'var(--text-2)', lineHeight: 1.5 }}>{line || ' '}</div>
              ))
            : <div style={{ fontSize: 13, color: 'var(--text-2)', lineHeight: 1.5 }}>{message}</div>}
        </div>
        <div className="modal-foot">
          <button className="btn ghost" onClick={onCancel}>{cancelLabel}</button>
          <button className={danger ? 'btn danger' : 'btn primary'} onClick={onConfirm} autoFocus>{confirmLabel}</button>
        </div>
      </div>
    </div>
  );
}

function useConfirm() {
  const [state, setState] = React.useState(null); // { opts, resolve } | null

  const confirm = React.useCallback((opts) => {
    return new Promise((resolve) => {
      setState({ opts: opts || {}, resolve });
    });
  }, []);

  const close = React.useCallback((result) => {
    setState((s) => {
      if (s) s.resolve(result);
      return null;
    });
  }, []);

  const modal = state
    ? <ConfirmModal
        {...state.opts}
        onConfirm={() => close(true)}
        onCancel={() => close(false)}
      />
    : null;

  return [confirm, modal];
}

Object.assign(window, { AssetThumb, FauxFrame, Waveform, LiveStrip, Sparkline, AudioMeter, StatusDot, Elapsed, ConfirmModal, useConfirm });
