#!/usr/bin/env python3
"""CLI commands for managing Databento cache.

Commands:
    vault-dash cache stats    Show cache statistics
    vault-dash cache list     Show all cached entries
    vault-dash cache clear    Clear all cache files

Usage:
    python scripts/cache_cli.py stats
    python scripts/cache_cli.py list
    python scripts/cache_cli.py clear [--yes]
"""

from __future__ import annotations

import argparse
import sys
from pathlib import Path

# Add project root to path for imports
project_root = Path(__file__).parent.parent
sys.path.insert(0, str(project_root))

from app.services.backtesting.databento_source import (  # noqa: E402
    DatabentoHistoricalPriceSource,
    DatabentoSourceConfig,
)


def format_size(size_bytes: int) -> str:
    """Format bytes as human-readable size."""
    if size_bytes < 1024:
        return f"{size_bytes}B"
    elif size_bytes < 1024 * 1024:
        return f"{size_bytes / 1024:.1f}KB"
    elif size_bytes < 1024 * 1024 * 1024:
        return f"{size_bytes / (1024 * 1024):.1f}MB"
    else:
        return f"{size_bytes / (1024 * 1024 * 1024):.2f}GB"


def cmd_stats(args: argparse.Namespace) -> int:
    """Show cache statistics."""
    config = DatabentoSourceConfig(cache_dir=Path(args.cache_dir))
    source = DatabentoHistoricalPriceSource(config)

    try:
        stats = source.get_cache_stats()
    except Exception as e:
        print(f"Error getting cache stats: {e}", file=sys.stderr)
        return 1

    total_size = stats["total_size_bytes"]
    file_count = stats["file_count"]
    oldest = stats["oldest_download"]
    entries = stats["entries"]

    print(f"Cache Directory: {config.cache_dir}")
    print(f"Total Size: {format_size(total_size)}")
    print(f"File Count: {file_count} files")
    print(f"Oldest Download: {oldest or 'N/A'}")

    if entries:
        print()
        print("Entries:")
        for entry in entries:
            cost_usd = entry.get("cost_usd", 0.0) or 0.0
            print(
                f"  - {entry['symbol']}/{entry['dataset']}/{entry['schema']}/"
                f"{entry['start_date']}_{entry['end_date']}: "
                f"{entry['rows']} rows, ${cost_usd:.2f}"
            )
    else:
        print()
        print("No cached entries found.")

    return 0


def cmd_list(args: argparse.Namespace) -> int:
    """List all cached entries in tabular format."""
    config = DatabentoSourceConfig(cache_dir=Path(args.cache_dir))
    source = DatabentoHistoricalPriceSource(config)

    try:
        stats = source.get_cache_stats()
    except Exception as e:
        print(f"Error getting cache stats: {e}", file=sys.stderr)
        return 1

    entries = stats["entries"]

    if not entries:
        print("No cached entries found.")
        return 0

    # Print header
    header = (
        f"{'Dataset':<12} {'Symbol':<8} {'Schema':<10} "
        f"{'Start':<12} {'End':<12} {'Rows':>6} "
        f"{'Downloaded':<12} {'Size':>8}"
    )
    print(header)
    print("-" * len(header))

    # Sort entries by dataset, symbol, start_date
    sorted_entries = sorted(
        entries,
        key=lambda e: (e.get("dataset", ""), e.get("symbol", ""), e.get("start_date", "")),
    )

    for entry in sorted_entries:
        print(
            f"{entry['dataset']:<12} "
            f"{entry['symbol']:<8} "
            f"{entry['schema']:<10} "
            f"{entry['start_date']:<12} "
            f"{entry['end_date']:<12} "
            f"{entry['rows']:>6} "
            f"{entry['download_date']:<12} "
            f"{format_size(entry['size_bytes']):>8}"
        )

    return 0


def cmd_clear(args: argparse.Namespace) -> int:
    """Clear all cache files."""
    config = DatabentoSourceConfig(cache_dir=Path(args.cache_dir))
    source = DatabentoHistoricalPriceSource(config)

    # Get stats before clearing for confirmation
    try:
        stats = source.get_cache_stats()
    except Exception as e:
        print(f"Error getting cache stats: {e}", file=sys.stderr)
        return 1

    file_count = stats["file_count"]
    total_size = stats["total_size_bytes"]

    if file_count == 0:
        print("No cache files to clear.")
        return 0

    # Confirm unless --yes flag
    if not args.yes:
        print(f"This will delete {file_count} files ({format_size(total_size)}) from:")
        print(f"  {config.cache_dir}")
        response = input("Proceed? [y/N]: ").strip().lower()
        if response != "y":
            print("Aborted.")
            return 1

    try:
        deleted = source.clear_cache()
        print(f"Cleared {deleted} files from cache.")
        return 0
    except Exception as e:
        print(f"Error clearing cache: {e}", file=sys.stderr)
        return 1


def main() -> int:
    parser = argparse.ArgumentParser(
        prog="vault-dash cache",
        description="Manage Databento cache files.",
    )
    parser.add_argument(
        "--cache-dir",
        default=".cache/databento",
        help="Cache directory path (default: .cache/databento)",
    )

    subparsers = parser.add_subparsers(dest="command", required=True)

    # stats command
    stats_parser = subparsers.add_parser(
        "stats",
        help="Show cache statistics",
    )
    stats_parser.set_defaults(func=cmd_stats)

    # list command
    list_parser = subparsers.add_parser(
        "list",
        help="List all cached entries",
    )
    list_parser.set_defaults(func=cmd_list)

    # clear command
    clear_parser = subparsers.add_parser(
        "clear",
        help="Clear all cache files",
    )
    clear_parser.add_argument(
        "-y",
        "--yes",
        action="store_true",
        help="Skip confirmation prompt",
    )
    clear_parser.set_defaults(func=cmd_clear)

    args = parser.parse_args()
    return args.func(args)


if __name__ == "__main__":
    raise SystemExit(main())