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#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import argparse
from pathlib import Path

AUDIO_EXTS = [".wav", ".flac", ".mp3", ".ogg", ".m4a"]


def is_audio_name(x: str) -> bool:
    return Path(x).suffix.lower() in AUDIO_EXTS


def is_sbc_source(x: str) -> bool:
    """
    第三列来源文件是否是 SBC 切片。
    例如:
        train_02263_SBC023_bgclip_1123.00_1127.00_score54.7008.wav
    """
    name = Path(x).name
    return "SBC" in name and is_audio_name(name)


def parse_protocol(protocol_path: Path):
    """
    返回所有 label == orig 的行,并标记第三列是否是 SBC 来源。
    兼容格式:
        train_orig_0007711 orig train_02263_SBC023_bgclip_1123.00_1127.00_score54.7008.wav
    """
    orig_rows = []

    with open(protocol_path, "r", encoding="utf-8", errors="ignore") as f:
        for line_no, line in enumerate(f, 1):
            line = line.strip()

            if not line or line.startswith("#"):
                continue

            parts = line.split()
            if len(parts) < 2:
                continue

            utt_id = parts[0]
            label = parts[1]

            # 跳过表头
            if utt_id.lower() in {"utt_id", "id"} or label.lower() == "label":
                continue

            if label != "orig":
                continue

            src = parts[2] if len(parts) >= 3 else ""

            orig_rows.append({
                "line_no": line_no,
                "utt_id": utt_id,
                "src": Path(src).name if src else "",
                "is_sbc": is_sbc_source(src),
            })

    return orig_rows


def find_target_file(wav_dir: Path, utt_id: str):
    """
    要删的是第一列 utt_id 对应的音频:
        train_orig_0007711 -> train_orig_0007711.wav
    """
    for ext in AUDIO_EXTS:
        p = wav_dir / f"{utt_id}{ext}"
        if p.exists():
            return p
    return None


def process_split(mixed_dir: Path, split: str, do_delete: bool):
    split_dir = mixed_dir / split
    wav_dir = split_dir / "wav"
    protocol_path = split_dir / "protocol.txt"

    result = {
        "split": split,
        "total_orig_rows": 0,
        "sbc_orig_rows": 0,
        "non_sbc_orig_rows": 0,
        "existing_delete_files": 0,
        "missing_delete_files": 0,
        "deleted_files": 0,
        "delete_targets": [],
        "missing_targets": [],
        "non_sbc_orig": [],
    }

    if not protocol_path.exists():
        print(f"[WARN] Missing protocol: {protocol_path}")
        return result

    if not wav_dir.exists():
        print(f"[WARN] Missing wav dir: {wav_dir}")
        return result

    orig_rows = parse_protocol(protocol_path)

    result["total_orig_rows"] = len(orig_rows)

    for r in orig_rows:
        if not r["is_sbc"]:
            result["non_sbc_orig_rows"] += 1
            result["non_sbc_orig"].append(r)
            continue

        result["sbc_orig_rows"] += 1

        target = find_target_file(wav_dir, r["utt_id"])

        if target is None:
            result["missing_delete_files"] += 1
            result["missing_targets"].append(r)
            continue

        result["existing_delete_files"] += 1
        result["delete_targets"].append({
            **r,
            "target": target,
        })

        if do_delete:
            target.unlink()
            result["deleted_files"] += 1

    return result


def write_reports(report_dir: Path, mixed_dir: Path, results):
    report_dir.mkdir(parents=True, exist_ok=True)

    summary_path = report_dir / "summary.txt"

    with open(summary_path, "w", encoding="utf-8") as f:
        f.write(
            "split total_orig sbc_orig non_sbc_orig "
            "existing_to_delete missing_to_delete deleted\n"
        )

        for r in results:
            f.write(
                f"{r['split']} "
                f"{r['total_orig_rows']} "
                f"{r['sbc_orig_rows']} "
                f"{r['non_sbc_orig_rows']} "
                f"{r['existing_delete_files']} "
                f"{r['missing_delete_files']} "
                f"{r['deleted_files']}\n"
            )

        f.write("\n")

        f.write(
            f"TOTAL "
            f"{sum(r['total_orig_rows'] for r in results)} "
            f"{sum(r['sbc_orig_rows'] for r in results)} "
            f"{sum(r['non_sbc_orig_rows'] for r in results)} "
            f"{sum(r['existing_delete_files'] for r in results)} "
            f"{sum(r['missing_delete_files'] for r in results)} "
            f"{sum(r['deleted_files'] for r in results)}\n"
        )

    for r in results:
        split = r["split"]

        with open(report_dir / f"{split}_delete_targets.txt", "w", encoding="utf-8") as f:
            f.write("line_no utt_id src_sbc target_file\n")
            for x in r["delete_targets"]:
                rel = x["target"].relative_to(mixed_dir)
                f.write(f"{x['line_no']} {x['utt_id']} {x['src']} {rel}\n")

        with open(report_dir / f"{split}_missing_targets.txt", "w", encoding="utf-8") as f:
            f.write("line_no utt_id src_sbc expected_file\n")
            for x in r["missing_targets"]:
                f.write(f"{x['line_no']} {x['utt_id']} {x['src']} {split}/wav/{x['utt_id']}.wav\n")

        with open(report_dir / f"{split}_non_sbc_orig_kept.txt", "w", encoding="utf-8") as f:
            f.write("line_no utt_id src\n")
            for x in r["non_sbc_orig"]:
                f.write(f"{x['line_no']} {x['utt_id']} {x['src']}\n")


def print_summary(results, do_delete: bool, report_dir: Path):
    print("\n==================== Summary ====================")
    print(f"Mode       : {'DELETE' if do_delete else 'DRY-RUN'}")
    print(f"Report dir : {report_dir}")

    total_orig = 0
    total_sbc = 0
    total_non_sbc = 0
    total_existing = 0
    total_missing = 0
    total_deleted = 0

    for r in results:
        total_orig += r["total_orig_rows"]
        total_sbc += r["sbc_orig_rows"]
        total_non_sbc += r["non_sbc_orig_rows"]
        total_existing += r["existing_delete_files"]
        total_missing += r["missing_delete_files"]
        total_deleted += r["deleted_files"]

        print(f"\n[{r['split']}]")
        print(f"  Total orig rows              : {r['total_orig_rows']}")
        print(f"  SBC-corresponding orig rows  : {r['sbc_orig_rows']}")
        print(f"  Non-SBC orig rows kept       : {r['non_sbc_orig_rows']}")
        print(f"  Existing files to delete     : {r['existing_delete_files']}")
        print(f"  Missing target files         : {r['missing_delete_files']}")
        print(f"  Deleted files                : {r['deleted_files']}")

    print("\n[TOTAL]")
    print(f"  Total orig rows              : {total_orig}")
    print(f"  SBC-corresponding orig rows  : {total_sbc}")
    print(f"  Non-SBC orig rows kept       : {total_non_sbc}")
    print(f"  Existing files to delete     : {total_existing}")
    print(f"  Missing target files         : {total_missing}")
    print(f"  Deleted files                : {total_deleted}")

    if total_orig > 0:
        ratio = total_sbc / total_orig * 100
        print(f"  SBC-orig ratio               : {ratio:.2f}%")

    if not do_delete:
        print("\n[DRY-RUN] 没有真正删除。确认 existing files to delete 数量正确后,加 --delete 再运行。")


def main():
    parser = argparse.ArgumentParser(
        description="Compare total orig rows with SBC-corresponding orig rows, then delete only those orig wavs."
    )

    parser.add_argument(
        "--mixed_sounds_dir",
        type=str,
        required=True,
        help="Path to Mixed_sounds directory.",
    )

    parser.add_argument(
        "--delete",
        action="store_true",
        help="Actually delete files. Default is dry-run.",
    )

    args = parser.parse_args()

    mixed_dir = Path(args.mixed_sounds_dir).resolve()
    report_dir = mixed_dir / "delete_sbc_orig_compare_report"

    results = []

    for split in ["train", "eval"]:
        results.append(
            process_split(
                mixed_dir=mixed_dir,
                split=split,
                do_delete=args.delete,
            )
        )

    write_reports(report_dir, mixed_dir, results)
    print_summary(results, args.delete, report_dir)


if __name__ == "__main__":
    main()