#!/usr/bin/env python3
"""
Pre-commit hook to warn about usage of deprecated get_setting_from_db_main_thread wrapper.

This function is deprecated because it's redundant - use the SettingsManager directly
with proper session context management instead.

NOTE: This hook currently only warns about usage to allow gradual migration.
"""

import sys
from pathlib import Path
from typing import List, Tuple


def check_file(filepath: Path) -> List[Tuple[int, str]]:
    """Check a single Python file for deprecated wrapper usage.

    Args:
        filepath: Path to the Python file to check

    Returns:
        List of (line_number, error_message) tuples
    """
    errors = []

    try:
        content = filepath.read_text(encoding="utf-8")

        # Short-circuit: no mention at all → nothing to check.
        if "get_setting_from_db_main_thread" not in content:
            return errors

        # Per-line scan. Previously this routine also walked the AST and
        # appended a second error per call site, producing duplicate
        # diagnostics on every hit. The AST walk (ast.Name match) is
        # strictly weaker than this line scan — any bare identifier
        # reference also appears on the line that contains it — so it
        # is safe to remove.
        for i, line in enumerate(content.split("\n"), 1):
            # Skip comment and docstring lines — they can legitimately
            # mention the deprecated name without invoking it.
            stripped = line.strip()
            if stripped.startswith(("#", '"""', "'''")):
                continue
            if "get_setting_from_db_main_thread" not in line:
                continue
            if "from" in line and "import" in line:
                errors.append(
                    (
                        i,
                        "Importing deprecated get_setting_from_db_main_thread - use SettingsManager with proper session context",
                    )
                )
            else:
                errors.append(
                    (
                        i,
                        "Using deprecated get_setting_from_db_main_thread - use SettingsManager with get_user_db_session context manager",
                    )
                )

    except Exception as e:
        print(f"Error checking {filepath}: {e}", file=sys.stderr)

    return errors


def main():
    """Main entry point for the pre-commit hook."""
    files_to_check = sys.argv[1:]

    if not files_to_check:
        print("No files to check")
        return 0

    all_errors = []

    for filepath_str in files_to_check:
        filepath = Path(filepath_str)

        # Skip non-Python files
        if filepath.suffix != ".py":
            continue

        # Skip the file that defines the function (db_utils.py), this hook itself,
        # and test files that test the deprecated function
        if filepath.name in [
            "db_utils.py",
            "check-deprecated-settings-wrapper.py",
            "test_db_utils.py",
            "test_db_utils_deep_coverage.py",
        ]:
            continue

        errors = check_file(filepath)
        if errors:
            all_errors.append((filepath, errors))

    if all_errors:
        print(
            "\n⚠️  Warning: Found usage of deprecated get_setting_from_db_main_thread wrapper:\n"
        )
        print(
            "This function is deprecated and will be removed in a future version."
        )
        print(
            "For Flask routes/views, use SettingsManager with proper session context:\n"
        )
        print(
            "  from local_deep_research.database.session_context import get_user_db_session"
        )
        print(
            "  from local_deep_research.utilities.db_utils import get_settings_manager"
        )
        print("")
        print("  with get_user_db_session(username) as db_session:")
        print(
            "      settings_manager = get_settings_manager(db_session, username)"
        )
        print("      value = settings_manager.get_setting(key, default)")
        print("\nFor background threads, use settings_snapshot pattern.")
        print("\nFiles with deprecated usage:")

        for filepath, errors in all_errors:
            print(f"\n  {filepath}:")
            for line_num, error_msg in errors:
                print(f"    Line {line_num}: {error_msg}")

        # Return 1 to fail and enforce migration
        return 1

    return 0


if __name__ == "__main__":
    sys.exit(main())