#!/usr/bin/env python3
"""Create a PPTX copy with text-frame autofit geometry materialized.

This helper is optional. It copies the source tree, sets text frames to
SHAPE_TO_FIT_TEXT, and uses LibreOffice to materialize the resulting geometry.
The source root is never edited in place.
"""

import argparse
import json
import shutil
import subprocess
from pathlib import Path

from pptx import Presentation
from pptx.enum.text import MSO_AUTO_SIZE


def iter_shapes(shapes):
    for shape in shapes:
        yield shape
        if hasattr(shape, "shapes"):
            try:
                for sub_shape in iter_shapes(shape.shapes):
                    yield sub_shape
            except Exception:
                pass


def collect_pptx_paths(root, pptx_name):
    paths = []
    skipped = []

    for child in sorted(root.iterdir(), key=lambda p: p.name):
        if not child.is_dir():
            continue

        if pptx_name:
            pptx = child / pptx_name
            if pptx.exists():
                paths.append(pptx)
            else:
                skipped.append({"dir_name": child.name, "reason": "missing_pptx"})
            continue

        matches = sorted(
            p for p in child.glob("*.pptx") if not p.name.startswith("~$")
        )
        if len(matches) == 1:
            paths.append(matches[0])
        elif not matches:
            skipped.append({"dir_name": child.name, "reason": "missing_pptx"})
        else:
            skipped.append({"dir_name": child.name, "reason": "multiple_pptx"})

    return paths, skipped


def apply_text_autofit(pptx_path):
    prs = Presentation(str(pptx_path))
    if len(prs.slides) == 0:
        return {
            "total_text_shapes": 0,
            "nonempty_text_shapes": 0,
            "changed_shapes": 0,
        }

    slide = prs.slides[0]
    changed = 0
    total_text_shapes = 0
    nonempty_text_shapes = 0

    for shape in iter_shapes(slide.shapes):
        if not getattr(shape, "has_text_frame", False):
            continue
        total_text_shapes += 1
        text = (shape.text or "").strip()
        if text:
            nonempty_text_shapes += 1
        text_frame = shape.text_frame
        text_frame.word_wrap = True
        if text_frame.auto_size != MSO_AUTO_SIZE.SHAPE_TO_FIT_TEXT:
            text_frame.auto_size = MSO_AUTO_SIZE.SHAPE_TO_FIT_TEXT
            changed += 1

    prs.save(str(pptx_path))
    return {
        "total_text_shapes": total_text_shapes,
        "nonempty_text_shapes": nonempty_text_shapes,
        "changed_shapes": changed,
    }


def libreoffice_roundtrip(pptx_path, tmp_dir, libreoffice_bin):
    tmp_dir.mkdir(parents=True, exist_ok=True)
    out_path = tmp_dir / pptx_path.name
    if out_path.exists():
        out_path.unlink()

    subprocess.run(
        [
            libreoffice_bin,
            "--headless",
            "--convert-to",
            "pptx",
            "--outdir",
            str(tmp_dir),
            str(pptx_path),
        ],
        check=True,
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,
        text=True,
    )

    if not out_path.exists():
        raise FileNotFoundError("LibreOffice did not produce: {}".format(out_path))
    shutil.move(str(out_path), str(pptx_path))


def relpath(path, root):
    try:
        return str(path.relative_to(root))
    except ValueError:
        return path.name


def parse_args():
    parser = argparse.ArgumentParser(
        description="Copy a PPTX tree and materialize text-frame autofit geometry."
    )
    parser.add_argument("--src-root", required=True, help="Source benchmark root.")
    parser.add_argument("--dst-root", required=True, help="Destination benchmark root.")
    parser.add_argument(
        "--pptx-name",
        default=None,
        help="Per-poster PPTX filename. Omit to auto-detect one PPTX per directory.",
    )
    parser.add_argument(
        "--tmp-dir",
        default=None,
        help="Temporary LibreOffice output directory. Defaults to <dst-root>/_lo_tmp.",
    )
    parser.add_argument(
        "--libreoffice-bin",
        default="libreoffice",
        help="LibreOffice or soffice executable name/path.",
    )
    parser.add_argument(
        "--skip-libreoffice-roundtrip",
        action="store_true",
        help="Only set PPTX auto-size flags; do not materialize geometry with LibreOffice.",
    )
    parser.add_argument(
        "--include-paths",
        action="store_true",
        help="Include absolute source/output paths in the summary JSON.",
    )
    return parser.parse_args()


def main():
    args = parse_args()
    src_root = Path(args.src_root).expanduser().resolve()
    dst_root = Path(args.dst_root).expanduser().resolve()
    tmp_dir = (
        Path(args.tmp_dir).expanduser().resolve()
        if args.tmp_dir
        else dst_root / "_lo_tmp"
    )

    if not src_root.exists():
        raise SystemExit("Source root does not exist: {}".format(src_root))
    if dst_root.exists():
        raise SystemExit("Destination already exists: {}".format(dst_root))

    shutil.copytree(src_root, dst_root)
    pptx_paths, skipped = collect_pptx_paths(dst_root, args.pptx_name)

    records = []
    failed = []
    for index, pptx_path in enumerate(pptx_paths, start=1):
        try:
            info = apply_text_autofit(pptx_path)
            if not args.skip_libreoffice_roundtrip:
                libreoffice_roundtrip(pptx_path, tmp_dir, args.libreoffice_bin)
            record = {
                "index": index,
                "dir_name": pptx_path.parent.name,
                "pptx_relpath": relpath(pptx_path, dst_root),
                **info,
            }
            if args.include_paths:
                record["pptx_path"] = str(pptx_path)
            records.append(record)
        except Exception as exc:
            failed_record = {
                "index": index,
                "dir_name": pptx_path.parent.name,
                "pptx_relpath": relpath(pptx_path, dst_root),
                "error": repr(exc),
            }
            if args.include_paths:
                failed_record["pptx_path"] = str(pptx_path)
            failed.append(failed_record)

        if index % 10 == 0 or index == len(pptx_paths):
            print("[{}/{}] {}".format(index, len(pptx_paths), pptx_path.parent.name))

    summary = {
        "protocol": "text_frame_autofit"
        + (" only" if args.skip_libreoffice_roundtrip else " + LibreOffice roundtrip"),
        "pptx_name": args.pptx_name,
        "processed_count": len(records),
        "failed_count": len(failed),
        "skipped_count": len(skipped),
        "records": records,
        "failed": failed,
        "skipped": skipped,
    }
    if args.include_paths:
        summary.update(
            {
                "source_root": str(src_root),
                "target_root": str(dst_root),
                "tmp_dir": str(tmp_dir),
            }
        )
    else:
        summary.update(
            {
                "source_root_name": src_root.name,
                "target_root_name": dst_root.name,
            }
        )

    summary_path = dst_root / "_pptx_autofit_summary.json"
    summary_path.write_text(
        json.dumps(summary, ensure_ascii=False, indent=2) + "\n",
        encoding="utf-8",
    )
    print("Summary written to: {}".format(summary_path))


if __name__ == "__main__":
    main()