#!/usr/bin/env python3
"""
Import Reference Files
======================
Reads existing reference and TM files from the source directory and copies
them into the storage/ directory structure used by the platform.

Source structure (from Agent build directory):
  JSON REFS and TMs/
    0-GLOBAL FOR ALL LOCALES/
      Amazon_TOV_Guidelines_for_Transcreation_290224.json
    1-PER LANGUAGE/
      CA_ES/
        ca_ES_glossary.json
        flat_MASS_ca-es.json
        ...

Target structure:
  storage/amazon/
    tm/{locale}/flat_{channel}_{lc}.json
    ref/glossary/{prefix}_glossary.json
    ref/blacklist/{prefix}_blacklist.json
    ref/date_pct_formats/{prefix}_date_percent_formats.json
    ref/locale_considerations/{prefix}_local_considerations.json
    ref/tov_global/Amazon_TOV_Guidelines_for_Transcreation_290224.json
    ref/tov_supplement/{LOCALE}_TOV_Guidelines.json

Usage:
  python seed/import_reference_files.py [--source <path>] [--target <path>] [--dry-run]
"""

import argparse
import re
import shutil
import sys
from pathlib import Path

# Default paths
DEFAULT_SOURCE = (
    Path(__file__).resolve().parent.parent.parent
    / "Agent build + supporting JSONs"
    / "JSON REFS and TMs"
)
DEFAULT_TARGET = Path(__file__).resolve().parent.parent / "storage" / "amazon"

CLIENT_ID = "amazon"

# Map folder names (CA_ES) to locale codes for TM paths (ca-ES)
# The folder name pattern is {lang}_{region} in uppercase
# TM files use lowercase-hyphenated (ca-es), ref files use underscore (ca_ES)


def folder_to_tm_locale(folder_name: str) -> str:
    """Convert folder name like CA_ES to TM locale like ca-ES."""
    parts = folder_name.split("_")
    if len(parts) == 2:
        return f"{parts[0].lower()}-{parts[1]}"
    return folder_name.lower()


def classify_file(filename: str) -> tuple[str, str | None]:
    """
    Classify a file as TM or a specific reference type.

    Returns:
        (category, sub_type) where category is 'tm', 'ref', or 'unknown'
        and sub_type provides detail for ref files.
    """
    lower = filename.lower()

    # TM files start with "flat_"
    if lower.startswith("flat_"):
        return ("tm", None)

    # Reference file patterns
    if "_glossary." in lower:
        return ("ref", "glossary")
    if "_blacklist." in lower:
        return ("ref", "blacklist")
    if "_date_percent_formats." in lower:
        return ("ref", "date_pct_formats")
    if "_local_considerations." in lower:
        return ("ref", "locale_considerations")
    if "tov_guidelines" in lower or "tov_guide" in lower:
        return ("ref", "tov_supplement")

    return ("unknown", None)


def extract_tm_locale_from_filename(filename: str) -> str | None:
    """Extract locale code from a TM filename like flat_MASS_ca-es.json."""
    match = re.search(r"_([a-z]{2}-[a-z]{2})\.json$", filename, re.IGNORECASE)
    if match:
        return match.group(1)
    return None


def import_global_files(
    source_dir: Path, target_dir: Path, dry_run: bool = False
) -> list[dict]:
    """Import files from the global directory."""
    global_dir = source_dir / "0-GLOBAL FOR ALL LOCALES"
    records = []

    if not global_dir.is_dir():
        print(f"  WARNING: Global directory not found: {global_dir}")
        return records

    for file_path in sorted(global_dir.iterdir()):
        if not file_path.is_file() or not file_path.suffix == ".json":
            continue

        dest = target_dir / "ref" / "tov_global" / file_path.name

        if not dry_run:
            dest.parent.mkdir(parents=True, exist_ok=True)
            shutil.copy2(file_path, dest)

        record = {
            "table": "reference_files",
            "file_type": "tov_global",
            "locale_scope": "global",
            "filename": file_path.name,
            "file_path": str(dest.relative_to(target_dir.parent.parent)),
        }
        records.append(record)
        print(f"  [GLOBAL] {file_path.name} -> ref/tov_global/")

    return records


def import_locale_files(
    source_dir: Path, target_dir: Path, dry_run: bool = False
) -> list[dict]:
    """Import per-locale TM and reference files."""
    locale_dir = source_dir / "1-PER LANGUAGE"
    records = []

    if not locale_dir.is_dir():
        print(f"  WARNING: Per-language directory not found: {locale_dir}")
        return records

    for folder in sorted(locale_dir.iterdir()):
        if not folder.is_dir():
            continue

        folder_name = folder.name  # e.g., CA_ES, DE_DE
        tm_locale = folder_to_tm_locale(folder_name)  # e.g., ca-ES

        print(f"\n  [{folder_name}] (locale: {tm_locale})")

        for file_path in sorted(folder.iterdir()):
            if not file_path.is_file() or file_path.suffix != ".json":
                continue

            category, sub_type = classify_file(file_path.name)

            if category == "tm":
                # TM files go to tm/{locale}/
                file_locale = extract_tm_locale_from_filename(file_path.name)
                dest = target_dir / "tm" / tm_locale / file_path.name

                if not dry_run:
                    dest.parent.mkdir(parents=True, exist_ok=True)
                    shutil.copy2(file_path, dest)

                # Extract channel name for the DB record
                channel_match = re.match(
                    r"flat_(.+?)_[a-z]{2}-[a-z]{2}\.json$",
                    file_path.name,
                    re.IGNORECASE,
                )
                channel = channel_match.group(1) if channel_match else "unknown"

                record = {
                    "table": "tm_file_registry",
                    "locale_code": file_locale or tm_locale,
                    "channel": channel,
                    "filename": file_path.name,
                    "file_path": str(
                        Path("amazon") / "tm" / tm_locale / file_path.name
                    ),
                }
                records.append(record)
                print(f"    TM: {file_path.name} -> tm/{tm_locale}/")

            elif category == "ref":
                # Reference files go to ref/{sub_type}/
                dest = target_dir / "ref" / sub_type / file_path.name

                if not dry_run:
                    dest.parent.mkdir(parents=True, exist_ok=True)
                    shutil.copy2(file_path, dest)

                record = {
                    "table": "reference_files",
                    "file_type": sub_type,
                    "locale_scope": tm_locale,
                    "filename": file_path.name,
                    "file_path": str(
                        Path("amazon") / "ref" / sub_type / file_path.name
                    ),
                }
                records.append(record)
                print(f"    REF: {file_path.name} -> ref/{sub_type}/")

            else:
                print(f"    SKIP: {file_path.name} (unrecognized file type)")

    return records


def print_db_summary(records: list[dict]) -> None:
    """Print a summary of database records that would be inserted."""
    tm_records = [r for r in records if r["table"] == "tm_file_registry"]
    ref_records = [r for r in records if r["table"] == "reference_files"]

    print("\n" + "=" * 70)
    print("DATABASE RECORDS (would be inserted)")
    print("=" * 70)

    print(f"\n  TM File Registry entries: {len(tm_records)}")
    for rec in tm_records:
        print(
            f"    INSERT tm_file_registry: "
            f"locale={rec['locale_code']}, channel={rec['channel']}, "
            f"file={rec['filename']}"
        )

    print(f"\n  Reference File entries: {len(ref_records)}")
    for rec in ref_records:
        print(
            f"    INSERT reference_files: "
            f"type={rec['file_type']}, scope={rec['locale_scope']}, "
            f"file={rec['filename']}"
        )

    print(f"\n  TOTAL: {len(records)} records")
    print("=" * 70)


def main() -> None:
    parser = argparse.ArgumentParser(
        description="Import reference and TM files into the storage directory structure.",
    )
    parser.add_argument(
        "--source",
        type=Path,
        default=DEFAULT_SOURCE,
        help=f"Source directory with JSON REFS and TMs (default: {DEFAULT_SOURCE})",
    )
    parser.add_argument(
        "--target",
        type=Path,
        default=DEFAULT_TARGET,
        help=f"Target storage directory (default: {DEFAULT_TARGET})",
    )
    parser.add_argument(
        "--dry-run",
        action="store_true",
        help="Show what would be done without copying files",
    )

    args = parser.parse_args()

    if not args.source.is_dir():
        print(f"Error: Source directory not found: {args.source}", file=sys.stderr)
        print(
            "Ensure the 'Agent build + supporting JSONs/JSON REFS and TMs/' "
            "directory exists alongside this project.",
            file=sys.stderr,
        )
        sys.exit(1)

    mode = "DRY RUN" if args.dry_run else "IMPORT"
    print(f"[{mode}] Importing reference files")
    print(f"  Source: {args.source}")
    print(f"  Target: {args.target}")
    print()

    if not args.dry_run:
        args.target.mkdir(parents=True, exist_ok=True)

    # Import global files
    print("--- Global Files ---")
    global_records = import_global_files(args.source, args.target, args.dry_run)

    # Import per-locale files
    print("\n--- Per-Locale Files ---")
    locale_records = import_locale_files(args.source, args.target, args.dry_run)

    all_records = global_records + locale_records

    # Summary
    print(f"\n{'=' * 70}")
    print("IMPORT SUMMARY")
    print(f"{'=' * 70}")
    print(f"  Files copied: {len(all_records)}")
    print(f"  TM files:     {sum(1 for r in all_records if r['table'] == 'tm_file_registry')}")
    print(f"  Ref files:    {sum(1 for r in all_records if r['table'] == 'reference_files')}")

    # Print what would be inserted in the DB
    print_db_summary(all_records)


if __name__ == "__main__":
    main()