"""Format merged segments as a sequential LLM-ready transcript.

Direct port of mts/meetus/transcript_merger.py:_format_detailed (line 249).
"""

import json
import logging
from pathlib import Path

log = logging.getLogger(__name__)


def format_detailed(merged_segments: list[dict], *, frames_relative_to: Path | None = None) -> str:
    """Render the interleaved transcript.

    If `frames_relative_to` is given, frame paths are rewritten relative to it.
    """
    lines = []
    lines.append("=" * 80)
    lines.append("ENHANCED MEETING TRANSCRIPT")
    lines.append("Audio transcript + Screen frames")
    lines.append("=" * 80)
    lines.append("")

    for seg in merged_segments:
        ts = _format_timestamp(seg["timestamp"])
        if seg["type"] == "audio":
            speaker = seg.get("speaker") or "SPEAKER"
            lines.append(f"[{ts}] {speaker}:")
            lines.append(f"  {seg['text']}")
            lines.append("")
        else:
            lines.append(f"[{ts}] SCREEN CONTENT:")
            fp = seg.get("frame_path")
            if fp:
                if frames_relative_to is not None:
                    try:
                        fp = str(Path(fp).resolve().relative_to(frames_relative_to.resolve()))
                    except ValueError:
                        fp = str(fp)
                else:
                    fp = str(fp)
                lines.append(f"  Frame: {fp}")
            lines.append("")

    return "\n".join(lines)


def _format_timestamp(seconds: float) -> str:
    seconds = int(seconds)
    h, rem = divmod(seconds, 3600)
    m, s = divmod(rem, 60)
    if h:
        return f"{h:02d}:{m:02d}:{s:02d}"
    return f"{m:02d}:{s:02d}"


def write_outputs(session_dir: Path, merged: list[dict], *, name: str | None = None) -> Path:
    """Write `<name>_enhanced.txt` and `merged.json` under `session_dir/summary`.

    Returns the path of the enhanced transcript.
    """
    summary_dir = session_dir / "summary"
    summary_dir.mkdir(parents=True, exist_ok=True)
    name = name or session_dir.name

    text = format_detailed(merged, frames_relative_to=session_dir)
    text_path = summary_dir / f"{name}_enhanced.txt"
    text_path.write_text(text)

    merged_path = summary_dir / "merged.json"
    merged_path.write_text(json.dumps(merged, indent=2, default=str))

    log.info("Wrote %s (%d entries)", text_path, len(merged))
    return text_path