#!/usr/bin/env python3
"""
Create a parquet dataset from mimicstudio.db and audio_files folder.

Output:
 - data/parquetfile/dataset.parquet
 - data/audio_files/<speaker_id>/<audio_id>.wav (copied)

The parquet will contain columns: source, text, audio (relative path)

Run from repo root: python3 scripts/create_parquet.py
"""
import sqlite3
import os
import shutil
import argparse
from pathlib import Path
import pandas as pd


def prepare(db_path: str, audio_root: str, out_audio_root: str, out_parquet: str, dry_run: bool = False):
    conn = sqlite3.connect(db_path)
    cur = conn.cursor()

    # Query audiomodel table for audio_id, prompt (text), speaker_id
    cur.execute("SELECT audio_id, prompt, speaker_id FROM audiomodel")
    rows = cur.fetchall()

    records = []
    total = len(rows)
    missing = 0

    for idx, (audio_id, prompt, speaker_id) in enumerate(rows, start=1):
        # Construct source path: audio_files/<speaker_id>/<audio_id>.wav
        src_path = Path(audio_root) / speaker_id / f"{audio_id}.wav"
        dest_dir = Path(out_audio_root) / speaker_id
        dest_path = dest_dir / f"{audio_id}.wav"

        # Use relative path that will be accessible from Colab when copying the data folder
        rel_audio_path = os.path.join("data", "audio_files", speaker_id, f"{audio_id}.wav")

        if not src_path.exists():
            print(f"Warning: audio file not found for row {idx}/{total}: {src_path}")
            missing += 1
            continue

        if not dry_run:
            dest_dir.mkdir(parents=True, exist_ok=True)
            # copy if not exists
            if not dest_path.exists():
                shutil.copy2(src_path, dest_path)

        # Build record for parquet
        records.append({
            "source": speaker_id if speaker_id is not None else "0",
            "text": prompt if prompt is not None else "",
            "audio": rel_audio_path,
        })

        if idx % 500 == 0:
            print(f"Processed {idx}/{total} rows...")

    conn.close()

    df = pd.DataFrame.from_records(records)

    if not dry_run:
        out_parquet_path = Path(out_parquet)
        out_parquet_path.parent.mkdir(parents=True, exist_ok=True)
        # Write parquet with pyarrow engine
        df.to_parquet(out_parquet, index=False)
        print(f"Wrote parquet to: {out_parquet}  (rows: {len(df)})")

    print(f"Done. Total rows: {total}, written: {len(records)}, missing audio: {missing}")


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("--db", default="db/mimicstudio.db", help="Path to mimicstudio.db")
    parser.add_argument("--audio-root", default="audio_files", help="Root folder containing original audio files")
    parser.add_argument("--out-audio-root", default="data/audio_files", help="Destination audio folder to copy into")
    parser.add_argument("--out-parquet", default="data/dataset.parquet", help="Output parquet path (default: data/dataset.parquet)")
    parser.add_argument("--dry-run", action="store_true", help="Don't copy or write files; just show counts")

    args = parser.parse_args()

    prepare(args.db, args.audio_root, args.out_audio_root, args.out_parquet, dry_run=args.dry_run)


if __name__ == "__main__":
    main()