"""
Step 1: Scan a restored FCCS backup directory for drawer IDs.

Every subdirectory in the backup root corresponds to a drawer.
Writes the sorted list of drawer IDs to the configured drawer_id_file.
"""

import os
import sys

from fccs_config import (
    parse_args, load_config, make_logger, load_lines, check_for_clashes,
)


def main():
    args = parse_args()
    cfg = load_config(args.config)
    log = make_logger(cfg.get("paths", "log_file"))

    backup_dir = cfg.get("paths", "backup_dir")
    output_file = cfg.get("paths", "drawer_id_file")
    ignore_file = cfg.get("paths", "ignore_file")

    if not os.path.isdir(backup_dir):
        log(f"ERROR: backup directory not found: {backup_dir}")
        sys.exit(1)

    drawer_ids = sorted(
        name for name in os.listdir(backup_dir)
        if os.path.isdir(os.path.join(backup_dir, name))
    )

    with open(output_file, "w", encoding="utf-8") as f:
        for did in drawer_ids:
            f.write(did + "\n")

    log(f"Found {len(drawer_ids)} drawers, written to {output_file}")

    # Report which drawers are set to be ignored (skipped by the export).
    ignored = set(load_lines(ignore_file))
    if ignored:
        present = sorted(ignored & set(drawer_ids))
        log(f"Ignore list ({ignore_file}): {len(ignored)} IDs, "
            f"{len(present)} present in this backup — these will be SKIPPED "
            f"by fccs_export.py: {', '.join(present) if present else '(none present)'}")

    # Flag prefix clashes: FCCS search on the shorter ID pops a selection box.
    clashes = check_for_clashes(drawer_ids)
    if clashes:
        log("-" * 60)
        log(f"WARNING: {len(clashes)} potential drawer ID clash(es) found.")
        log("Searching the shorter ID in FCCS may show a selection box "
            "instead of navigating directly, which breaks the export.")
        log("Consider exporting these manually, or add the shorter ID to "
            f"the ignore list ({ignore_file}).")
        for short, matches in clashes:
            flag = " [ignored]" if short in ignored else ""
            log(f"  {short}{flag}  ->  also matches: {', '.join(matches)}")
        log("-" * 60)
    else:
        log("No drawer ID prefix clashes found.")


if __name__ == "__main__":
    main()