import argparse
import json
import re
from pathlib import Path

# search
# "transcript"\s*:\s*"[^"]*[^\u0A00-\u0A7F\s][^"]*"
# "transcript"\s*:\s*"[^"]*(?:ਅਾ|ੲਿ|ੲੀ|ੳੁ|ੳੂ|ੲੇ|ਅੈ|ੳੋ|ਅੌ)[^"]*"
#  ੍[ਾਿੀੁੂੇੈੋੌ]
# [੍ੑਂੰਁੱ][ਾਿੀੁੂੇੈੋੌ]
# (ਪਹਿਲਾ|ਦੂਜਾ|ਤੀਜਾ|ਚੌਥਾ|ਪੰਜਵਾ|ਛੇਵਾ|ਸਤਵਾ|ਅਠਵਾ|ਨੌਵਾ|ਦਸਵਾ)(?=[\u0A00-\u0A7F])
# ॥ਪਹਿਲਾਰਹਾਉ ਦੂਜਾ

# todo: check matra split issues including ਦ੍ਰਿੜ੍ੁ

# Folder where this Python script is located
BASE_DIR = Path(__file__).resolve().parent


# Exact word/text replacements
REPLACEMENTS = {
    # "ਦ੍ਰਿੜ੍ੁ": "ਦ੍ਰਿੜੑੁ",
    "ਦ੍ਰਿਸਿ੍ਟ": "ਦ੍ਰਿਸ੍ਟਿ",
    "ਦ੍ਰਿਸਿ†": "ਦ੍ਰਿਸ੍ਟਿ",
    "ਬਿਸ†ਾ": "ਬਿਸ੍ਟਾ",
    "ਸ੍ਰਿਸਿ†": "ਸ੍ਰਿਸ੍ਟਿ",
    "ਸ੍ਰਿਸਿ੍ਟ": "ਸ੍ਰਿਸ੍ਟਿ",
    "ਗਰਿਸ†": "ਗਰਿਸ੍ਟ",
    "ਮਿਸ†": "ਮਿਸ੍ਟ",
    "ਇਸ਼†": "ਇਸ਼ਟ",
    "ਇਸ˜ਾਨੁ": "ਇਸ੍ਨਾਨੁ",
    "ਕ੍ਰਿਸ˜ਾ": "ਕ੍ਰਿਸ੍ਨਾ",
    "ਕ੍ਰਿਸ˜ੰ": "ਕ੍ਰਿਸ੍ਨੰ",
    "ਕ੍ਰਿਸ˜": "ਕ੍ਰਿਸ੍ਨ",
    "ਸ˜ੇਹੰ": "ਸ੍ਨੇਹੰ",
    "ਸ˜ੇਹ": "ਸ੍ਨੇਹ",
    "ਬੈਸ˜ਵਹ": "ਬੈਸ੍ਨਵਹ"
}


def apply_text_fixes(text):
    text = text.replace('ਅਾਂ', 'ਆਂ')
    text = text.replace('ਅਾ', 'ਆ')
    text = text.replace('ੲੀਂ', 'ਈਂ')
    text = text.replace("ˆ", "ਂ")

    # halant fix
    text = text.replace('ਕਾਨ੍ੁ', 'ਕਾਨੑੁ')
    text = text.replace('ਚੀਨ੍ਾਂ', 'ਚੀਨੑਾਂ')
    text = text.replace('ਦ੍ਰਿੜ੍ੁ', 'ਦ੍ਰਿੜੑੁ')
    text = text.replace('ਕੀਨ੍ੋ', 'ਕੀਨੑੋ')
    text = text.replace('ਥੰਮ੍ੁ', 'ਥੰਮੑੁ')
    text = text.replace('ਪਾਨ੍ੋ', 'ਪਾਨੑੋ')

    # Apply known corrections
    for wrong, correct in REPLACEMENTS.items():
        text = text.replace(wrong, correct)

    # Collapse multiple whitespace into one space
    text = re.sub(r"\s+", " ", text)

    # Remove spaces from beginning and end
    text = text.strip()

    return text


def clean_transcript(text):
    # Transcript-only cleanup
    text = text.replace(",", "").replace("।", "")
    text = text.replace(";", "").replace(".", "")
    text = text.replace("Ø", "")

    # Shared fixes
    text = apply_text_fixes(text)

    return text


def clean_gurmukhi(text):
    # Do NOT remove punctuation from gurmukhi
    text = apply_text_fixes(text)

    return text


def process_file(path, clean=False):
    try:
        with path.open("r", encoding="utf-8") as f:
            data = json.load(f)
    except Exception as e:
        print(f"ERROR: {path.relative_to(BASE_DIR)}")
        print(f"  {e}")
        return 0

    changed = 0

    for section in data.get("sections", []):
        section_id = section.get("section_id", "?")

        fields = {
            "transcript": clean_transcript,
            "gurbani_text": clean_gurmukhi,
        }

        for field, cleaner in fields.items():
            old_text = section.get(field)

            if not isinstance(old_text, str):
                continue

            new_text = cleaner(old_text)

            if old_text == new_text:
                continue

            changed += 1

            print(f"\n{path.relative_to(BASE_DIR)}")
            print(f"  {section_id}")
            print(f"  FIELD: {field}")
            print(f"  OLD: {old_text}")
            print(f"  NEW: {new_text}")

            if clean:
                section[field] = new_text

    if clean and changed:
        with path.open("w", encoding="utf-8") as f:
            json.dump(data, f, ensure_ascii=False, indent=2)

    return changed


def main():
    parser = argparse.ArgumentParser(
        description="Clean transcript fields in all nested JSON files."
    )

    mode = parser.add_mutually_exclusive_group(required=True)

    mode.add_argument(
        "--dry-run",
        action="store_true",
        help="Show changes without modifying files",
    )

    mode.add_argument(
        "--clean",
        action="store_true",
        help="Apply changes and overwrite files",
    )

    args = parser.parse_args()

    # Recursively find JSON files in all folders below this script
    files = sorted(BASE_DIR.rglob("*.json"))

    if not files:
        print(f"No JSON files found under: {BASE_DIR}")
        return

    print(f"Base folder: {BASE_DIR}")
    print(f"JSON files found: {len(files)}")

    total_changed = 0
    files_changed = 0

    for file in files:
        count = process_file(file, clean=args.clean)

        if count:
            files_changed += 1
            total_changed += count

    print("\n" + "=" * 60)

    if args.dry_run:
        print("DRY RUN — no files were modified")
    else:
        print("CLEAN COMPLETE")

    print(f"JSON files checked:  {len(files)}")
    print(f"Files with changes:  {files_changed}")
    print(f"Transcripts changed: {total_changed}")


if __name__ == "__main__":
    main()