// timeline.js — v2.1.3
// Reads active Premiere sequence via the real UXP premierepro DOM API.
//
// Key corrections from official docs (developer.adobe.com/premiere-pro/uxp/ppro-reference/):
//   • Most Premiere API calls are SYNCHRONOUS — no await needed
//   • Track items via VideoTrack.getTrackItems(TrackItemType.Clip, false) → VideoClipTrackItem[]
//     (no getClipCount / getClip — those don't exist)
//   • Media file path via ClipProjectItem.cast(projItem).getMediaFilePath() (not getMediaPath)
//   • Relink via ClipProjectItem.cast(projItem).changeMediaFilePath(newPath, false)
//   • TickTime.seconds is the float-seconds property (use directly, no ticks math needed)
//   • project.getRootItem() and getActiveProject() are synchronous

(function () {
  const Timeline = {};

  function ppro() {
    if (Timeline._ppro) return Timeline._ppro;
    try { Timeline._ppro = require('premierepro'); }
    catch (e) { throw new Error('UXP premierepro unavailable: ' + e.message); }
    return Timeline._ppro;
  }

  // ── Read active sequence ─────────────────────────────────────────
  // Returns { sequenceName, frameRate, width, height, clips[] }
  // clips: { fileName, filePath, trackIndex,
  //          timelineInSec, timelineOutSec, sourceInSec, sourceOutSec }
  Timeline.readActiveSequence = async function () {
    const P = ppro();
    const project = P.Project.getActiveProject();               // sync
    if (!project) throw new Error('No active Premiere project');

    const seq = project.getActiveSequence();                    // sync
    if (!seq) throw new Error('No active sequence');

    const name     = seq.name || 'Sequence 1';
    const settings = seq.getSettings();                         // sync
    // SequenceSettings.videoFrameRate is a FrameRate object with .seconds property
    // .seconds on FrameRate = 1/fps (duration of one frame in seconds)
    let frameRate = 29.97;
    try {
      const fr = settings.videoFrameRate;
      if (fr && typeof fr.seconds === 'number' && fr.seconds > 0) {
        frameRate = 1 / fr.seconds;
      }
    } catch (_) {}
    const width  = settings.videoFrameWidth  || 1920;
    const height = settings.videoFrameHeight || 1080;

    const clips      = [];
    const trackCount = seq.getVideoTrackCount();                // sync

    for (let ti = 0; ti < trackCount; ti++) {
      const track = seq.getVideoTrack(ti);                      // sync
      if (!track) continue;

      // getTrackItems(TrackItemType, includeEmptyItems) → VideoClipTrackItem[]
      let items = [];
      try {
        // Constants.TrackItemType.Clip = 1
        items = track.getTrackItems(1, false);
      } catch (_) { continue; }
      if (!items || !items.length) continue;

      for (const clip of items) {
        try {
          const projItem = clip.getProjectItem();               // sync
          if (!projItem) continue;

          // Cast to ClipProjectItem to get file path
          let filePath = '';
          try {
            const clipItem = P.ClipProjectItem.cast(projItem);
            filePath = clipItem.getMediaFilePath() || '';       // sync
          } catch (_) {}

          const fileName = clip.getName() || path.basename(filePath) || 'clip';

          // TickTime.seconds is directly available as a number property
          const tlIn  = clip.getStartTime().seconds;           // timeline start
          const tlOut = clip.getEndTime().seconds;             // timeline end
          const srcIn = clip.getInPoint().seconds;             // source in
          const srcOut= clip.getOutPoint().seconds;            // source out

          clips.push({
            fileName,
            filePath,
            trackIndex:      ti,
            timelineInSec:   tlIn,
            timelineOutSec:  tlOut,
            sourceInSec:     srcIn,
            sourceOutSec:    srcOut,
            // frame equivalents for FCP XML / MAM clip push
            timelineInFrames:  Math.round(tlIn  * frameRate),
            timelineOutFrames: Math.round(tlOut * frameRate),
            sourceInFrames:    Math.round(srcIn  * frameRate),
            sourceOutFrames:   Math.round(srcOut * frameRate),
          });
        } catch (_) {}
      }
    }

    return { sequenceName: name, frameRate, width, height, clips };
  };

  // ── Active sequence info bar ─────────────────────────────────────
  Timeline.refreshSeqBar = async function () {
    try {
      const P = ppro();
      const project = P.Project.getActiveProject();
      if (!project) { UI.setHidden('#seq-info-bar', true); return; }
      const seq = project.getActiveSequence();
      if (!seq)  { UI.setHidden('#seq-info-bar', true); return; }
      const name = seq.name || '';
      if (name) {
        document.getElementById('seq-info-name').textContent = name;
        UI.setHidden('#seq-info-bar', false);
      } else {
        UI.setHidden('#seq-info-bar', true);
      }
    } catch (_) {
      UI.setHidden('#seq-info-bar', true);
    }
  };

  // ── FCP XML generation ───────────────────────────────────────────
  Timeline.generateFcpXml = function (timelineData) {
    const seqName   = UI.escapeXml(timelineData.sequenceName || 'Sequence 1');
    const frameRate = timelineData.frameRate || 29.97;
    const width     = timelineData.width     || 1920;
    const height    = timelineData.height    || 1080;
    const clips     = timelineData.clips     || [];

    let totalFrames = 0;
    clips.forEach(c => { if ((c.timelineOutFrames||0) > totalFrames) totalFrames = c.timelineOutFrames; });
    if (totalFrames < 1) totalFrames = 100;

    const duration = UI.timecodeFromFrames(totalFrames, frameRate);
    const frateStr = UI.formatFrameRate(frameRate);

    let xml = '<?xml version="1.0" encoding="UTF-8"?>\n<!DOCTYPE fcpxml>\n<fcpxml version="1.10">\n';
    xml += '  <resources>\n';
    xml += '    <format id="r0" frameDuration="' + frateStr + '" width="' + width + '" height="' + height + '"/>\n';

    const seen = {}; let rid = 1;
    clips.forEach(clip => {
      const key = clip.filePath || clip.fileName || 'c' + rid;
      if (!seen[key]) {
        seen[key] = 'r' + rid;
        const srcDur = UI.timecodeFromFrames(
          Math.max(1, (clip.sourceOutFrames||100) - (clip.sourceInFrames||0)), frameRate
        );
        xml += '    <asset id="r' + rid + '" name="' + UI.escapeXml(clip.fileName||'Clip') + '"'
             + ' src="' + UI.escapeXml(clip.filePath||'') + '"'
             + ' duration="' + srcDur + '" start="0s" format="r0"/>\n';
        rid++;
      }
    });
    xml += '  </resources>\n  <library>\n    <event name="Conform Export">\n      <project name="' + seqName + '">\n';
    xml += '        <sequence duration="' + duration + '" format="r0">\n          <spine>\n';

    clips.forEach(clip => {
      const resId = seen[clip.filePath || clip.fileName || 'x'] || 'r1';
      const off   = UI.timecodeFromFrames(clip.timelineInFrames  || 0, frameRate);
      const dur   = UI.timecodeFromFrames(Math.max(1, (clip.timelineOutFrames||1) - (clip.timelineInFrames||0)), frameRate);
      const srcIn = UI.timecodeFromFrames(clip.sourceInFrames || 0, frameRate);
      xml += '            <clip name="' + UI.escapeXml(clip.fileName||'Clip') + '"'
           + ' offset="' + off + '" duration="' + dur + '" start="' + srcIn + '">\n';
      xml += '              <asset-clip ref="' + resId + '"/>\n            </clip>\n';
    });

    xml += '          </spine>\n        </sequence>\n      </project>\n    </event>\n  </library>\n</fcpxml>';
    return xml;
  };

  // ── Push Timeline to MAM ─────────────────────────────────────────
  Timeline.pushToMAM = async function (seqName, projectId, timelineData) {
    const resolved = Library.resolveClipsToAssets(timelineData.clips || []);
    const matched  = resolved.filter(c => c.asset_id);
    if (!matched.length) throw new Error('No clips matched MAM assets — import proxies first');

    const seqs = await API.listSequences(projectId);
    let seqId;
    const existing = seqs.find(s => s.name === seqName);
    if (existing) {
      await API.updateSequence(existing.id, {
        frame_rate: timelineData.frameRate, width: timelineData.width, height: timelineData.height,
      });
      seqId = existing.id;
    } else {
      const created = await API.createSequence(
        projectId, seqName, timelineData.frameRate, timelineData.width, timelineData.height
      );
      seqId = created.id;
    }

    const payload = matched.map(c => ({
      asset_id:            c.asset_id,
      track:               c.trackIndex,
      timeline_in_frames:  c.timelineInFrames,
      timeline_out_frames: c.timelineOutFrames,
      source_in_frames:    c.sourceInFrames,
      source_out_frames:   c.sourceOutFrames,
    }));
    await API.pushClips(seqId, payload);
    return { seqId, matched: matched.length, skipped: resolved.length - matched.length };
  };

  // ── Conform ──────────────────────────────────────────────────────
  Timeline.startConform = async function (projectId, seqName, timelineData, opts) {
    const { seqId } = await Timeline.pushToMAM(seqName, projectId, timelineData);
    const resMap = { '1080p': [1920,1080], '720p': [1280,720], 'uhd': [3840,2160], 'source': [0,0] };
    const [w, h] = resMap[opts.resolution] || [1920,1080];
    const job = await API.startConform(seqId, {
      codec: opts.codec, quality: opts.quality,
      width: w || undefined, height: h || undefined,
      audio: opts.audio,
      fcp_xml: Timeline.generateFcpXml(timelineData),
    });
    return job.jobId || job.id;
  };

  Timeline.pollConform = function (jobId, onProgress, onDone) {
    const timer = setInterval(async () => {
      try {
        const job = await API.getJob(jobId);
        onProgress(job.progress || 0, job.status);
        if (job.status === 'completed' || job.status === 'failed') {
          clearInterval(timer);
          onDone(job);
        }
      } catch (_) {}
    }, 2000);
    return timer;
  };

  // ── Batch Hi-Res Relink ──────────────────────────────────────────
  // selectedClips: resolved clip objects with asset_id + filePath
  Timeline.batchRelink = async function (selectedClips) {
    const P = ppro();
    const project = P.Project.getActiveProject();               // sync
    if (!project) throw new Error('No active Premiere project');

    const results = { succeeded: 0, failed: 0, errors: [] };

    for (const clip of selectedClips) {
      if (!clip.asset_id) continue;
      try {
        UI.showProgress('Fetching hi-res for ' + clip.fileName + '…', 20);
        const info     = await API.getHiresInfo(clip.asset_id);
        const safeName = UI.sanitizeFilename(info.filename || clip.fileName + '.' + (info.ext || 'mxf'));
        const dest     = await Import._tempPath(safeName);

        UI.showProgress('Downloading ' + safeName + '…', 30);
        const r = await API.requestFollow(info.url, {});
        if (!r.ok) throw new Error('Download HTTP ' + r.status);
        await Import._streamToFile(r, dest, ({ received, total }) => {
          const pct = total ? 30 + (received / total) * 50 : 30;
          UI.showProgress(UI.formatBytes(received) + '…', pct);
        });

        UI.showProgress('Relinking ' + clip.fileName + '…', 85);
        await Timeline._relinkInProject(project, clip.filePath, dest);
        results.succeeded++;
      } catch (e) {
        results.failed++;
        results.errors.push(clip.fileName + ': ' + e.message);
      }
    }
    return results;
  };

  // Walk project items and changeMediaFilePath for items matching oldPath.
  // Uses ClipProjectItem.cast() + changeMediaFilePath() per official docs.
  Timeline._relinkInProject = async function (project, oldPath, newPath) {
    const P    = ppro();
    const root = project.getRootItem();                         // sync (FolderItem)
    let count  = 0;

    function walkSync(folderItem) {
      // FolderItem has no getItems() in docs — use project.getSequences() / rootItem children
      // Actually FolderItem IS a ProjectItem; children accessible via getItems on the project
      // Try both known APIs gracefully
      let children = [];
      try {
        // Some UXP builds expose children on FolderItem directly
        if (typeof folderItem.getItems === 'function') {
          children = folderItem.getItems() || [];
        }
      } catch (_) {}

      for (const item of children) {
        try {
          const clipItem = P.ClipProjectItem.cast(item);
          const mp = clipItem.getMediaFilePath();
          if (mp && mp === oldPath) {
            clipItem.changeMediaFilePath(newPath, false);
            count++;
          }
        } catch (_) {
          // cast fails for FolderItems — try to recurse
          try { walkSync(item); } catch (__) {}
        }
      }
    }

    walkSync(root);

    // If walkSync found nothing (getItems not on FolderItem in this build),
    // fall back to findItemsMatchingMediaPath on root
    if (count === 0) {
      try {
        const matches = P.ClipProjectItem.cast(root).findItemsMatchingMediaPath(oldPath, true);
        for (const item of (matches || [])) {
          try {
            const clipItem = P.ClipProjectItem.cast(item);
            clipItem.changeMediaFilePath(newPath, false);
            count++;
          } catch (_) {}
        }
      } catch (_) {}
    }

    if (count === 0) throw new Error('No matching clips found for path: ' + (oldPath || 'unknown'));
    return count;
  };

  window.Timeline = Timeline;
})();