#!/usr/bin/env python3
"""
Database management utility for Stock Alchemist
Similar to cache_util.py but for the local database system
"""

import argparse
import sys
from pathlib import Path
from datetime import datetime, timedelta
import json

# Add src to path
sys.path.append(str(Path(__file__).parent.parent))

from db.local_database import LocalDatabase, DataType


def show_stats(db_dir: str):
    """Show database statistics"""
    db = LocalDatabase(db_dir=db_dir)
    stats = db.get_stats()
    
    print("\n" + "="*60)
    print("DATABASE STATISTICS")
    print("="*60)
    
    print(f"\n📊 Overview:")
    print(f"  Total Entries: {stats.get('total_entries', 0):,}")
    print(f"  Total Size: {stats.get('total_size_mb', 0)} MB ({stats.get('total_size_bytes', 0):,} bytes)")
    print(f"  Compression: {stats.get('compression', 'disabled')}")
    print(f"  Expired Entries: {stats.get('expired_entries', 0)}")
    
    date_range = stats.get('date_range')
    if date_range:
        print(f"  Date Range: {date_range['from']} to {date_range['to']}")
    
    by_type = stats.get('by_type', {})
    if by_type:
        print(f"\n📁 By Data Type:")
        for data_type, count in sorted(by_type.items()):
            print(f"  {data_type:.<30} {count:>6,}")
    
    top_tickers = stats.get('top_tickers', {})
    if top_tickers:
        print(f"\n🏢 Top 10 Tickers:")
        for ticker, count in list(top_tickers.items())[:10]:
            print(f"  {ticker:.<20} {count:>6,}")
    
    print("\n" + "="*60 + "\n")


def clean_expired(db_dir: str):
    """Clean expired entries"""
    db = LocalDatabase(db_dir=db_dir)
    count = db.clean_expired()
    print(f"✓ Cleaned {count} expired entries")


def clear_all(db_dir: str, confirm: bool = False):
    """Clear all database entries"""
    if not confirm:
        response = input("⚠️  This will delete ALL data. Are you sure? (yes/no): ")
        if response.lower() != 'yes':
            print("❌ Cancelled")
            return
    
    db = LocalDatabase(db_dir=db_dir)
    db.clear_all()


def clear_by_type(db_dir: str, data_type: str):
    """Clear entries of specific type"""
    db = LocalDatabase(db_dir=db_dir)
    
    # Query all entries of this type
    entries = db.query(data_type=data_type)
    
    if not entries:
        print(f"No entries found for type: {data_type}")
        return
    
    print(f"Found {len(entries)} entries of type '{data_type}'")
    response = input("Delete these entries? (yes/no): ")
    
    if response.lower() != 'yes':
        print("❌ Cancelled")
        return
    
    # Delete each entry
    deleted = 0
    for entry in entries:
        if db.delete(entry.date, entry.data_type, entry.ticker):
            deleted += 1
    
    print(f"✓ Deleted {deleted} entries")


def clear_by_ticker(db_dir: str, ticker: str):
    """Clear entries for specific ticker"""
    db = LocalDatabase(db_dir=db_dir)
    
    # Query all entries for this ticker
    entries = db.query(ticker=ticker)
    
    if not entries:
        print(f"No entries found for ticker: {ticker}")
        return
    
    print(f"Found {len(entries)} entries for ticker '{ticker}'")
    response = input("Delete these entries? (yes/no): ")
    
    if response.lower() != 'yes':
        print("❌ Cancelled")
        return
    
    # Delete each entry
    deleted = 0
    for entry in entries:
        if db.delete(entry.date, entry.data_type, entry.ticker):
            deleted += 1
    
    print(f"✓ Deleted {deleted} entries")


def clear_older_than(db_dir: str, days: int):
    """Clear entries older than specified days"""
    db = LocalDatabase(db_dir=db_dir)
    cutoff_date = (datetime.now() - timedelta(days=days)).date().isoformat()
    
    # Query old entries
    entries = db.query(date_to=cutoff_date)
    
    if not entries:
        print(f"No entries older than {days} days")
        return
    
    print(f"Found {len(entries)} entries older than {days} days")
    response = input("Delete these entries? (yes/no): ")
    
    if response.lower() != 'yes':
        print("❌ Cancelled")
        return
    
    # Delete each entry
    deleted = 0
    for entry in entries:
        if db.delete(entry.date, entry.data_type, entry.ticker):
            deleted += 1
    
    print(f"✓ Deleted {deleted} entries")


def search(db_dir: str, date_from: str = None, date_to: str = None, 
          data_type: str = None, ticker: str = None, limit: int = 10):
    """Search database entries"""
    db = LocalDatabase(db_dir=db_dir)
    
    entries = db.query(
        date_from=date_from,
        date_to=date_to,
        data_type=data_type,
        ticker=ticker,
        limit=limit
    )
    
    if not entries:
        print("No entries found")
        return
    
    print(f"\n📋 Found {len(entries)} entries:\n")
    print(f"{'Date':<12} {'Type':<20} {'Ticker':<10} {'Created':<20}")
    print("-" * 70)
    
    for entry in entries:
        created = datetime.fromisoformat(entry.created_at).strftime("%Y-%m-%d %H:%M")
        print(f"{entry.date:<12} {entry.data_type:<20} {entry.ticker:<10} {created:<20}")
    
    print()


def export_data(db_dir: str, output_file: str, date_from: str = None, 
               date_to: str = None, data_type: str = None, ticker: str = None):
    """Export database entries to JSON file"""
    db = LocalDatabase(db_dir=db_dir)
    
    entries = db.query(
        date_from=date_from,
        date_to=date_to,
        data_type=data_type,
        ticker=ticker
    )
    
    if not entries:
        print("No entries to export")
        return
    
    # Convert to dict list
    export_data = [entry.to_dict() for entry in entries]
    
    # Write to file
    with open(output_file, 'w', encoding='utf-8') as f:
        json.dump(export_data, f, indent=2, default=str)
    
    print(f"✓ Exported {len(entries)} entries to {output_file}")


def import_data(db_dir: str, input_file: str, expiry_days: int = None):
    """Import database entries from JSON file"""
    db = LocalDatabase(db_dir=db_dir)
    
    with open(input_file, 'r', encoding='utf-8') as f:
        data = json.load(f)
    
    if not isinstance(data, list):
        print("❌ Invalid format: expected list of entries")
        return
    
    from db.local_database import DatabaseEntry
    
    entries = []
    for item in data:
        try:
            entry = DatabaseEntry.from_dict(item)
            entries.append(entry)
        except Exception as e:
            print(f"⚠️  Skipping invalid entry: {e}")
    
    if not entries:
        print("No valid entries to import")
        return
    
    print(f"Found {len(entries)} valid entries")
    response = input("Import these entries? (yes/no): ")
    
    if response.lower() != 'yes':
        print("❌ Cancelled")
        return
    
    count = db.save_batch(entries, expiry_days=expiry_days)
    print(f"✓ Imported {count} entries")


def list_types():
    """List available data types"""
    print("\n📁 Available Data Types:\n")
    for dt in DataType:
        print(f"  - {dt.value}")
    print()


def main():
    parser = argparse.ArgumentParser(
        description="Database management utility for Stock Alchemist",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
Examples:
  # Show statistics
  python db_util.py --stats
  
  # Clean expired entries
  python db_util.py --clean-expired
  
  # Search for entries
  python db_util.py --search --ticker AAPL --limit 20
  
  # Clear entries by type
  python db_util.py --clear-type financial_info
  
  # Clear entries older than 30 days
  python db_util.py --clear-older-than 30
  
  # Export data
  python db_util.py --export backup.json --date-from 2025-01-01
  
  # Import data
  python db_util.py --import backup.json --expiry-days 30
        """
    )
    
    parser.add_argument("--db-dir", type=str, default="database",
                       help="Database directory (default: database)")
    
    # Actions
    parser.add_argument("--stats", action="store_true",
                       help="Show database statistics")
    parser.add_argument("--clean-expired", action="store_true",
                       help="Clean expired entries")
    parser.add_argument("--clear-all", action="store_true",
                       help="Clear all entries (WARNING: destructive)")
    parser.add_argument("--clear-type", type=str,
                       help="Clear entries of specific type")
    parser.add_argument("--clear-ticker", type=str,
                       help="Clear entries for specific ticker")
    parser.add_argument("--clear-older-than", type=int,
                       help="Clear entries older than N days")
    parser.add_argument("--search", action="store_true",
                       help="Search database entries")
    parser.add_argument("--export", type=str,
                       help="Export entries to JSON file")
    parser.add_argument("--import", type=str, dest="import_file",
                       help="Import entries from JSON file")
    parser.add_argument("--list-types", action="store_true",
                       help="List available data types")
    
    # Query filters
    parser.add_argument("--date-from", type=str,
                       help="Start date (YYYY-MM-DD)")
    parser.add_argument("--date-to", type=str,
                       help="End date (YYYY-MM-DD)")
    parser.add_argument("--data-type", type=str,
                       help="Filter by data type")
    parser.add_argument("--ticker", type=str,
                       help="Filter by ticker")
    parser.add_argument("--limit", type=int, default=10,
                       help="Limit number of results (default: 10)")
    parser.add_argument("--expiry-days", type=int,
                       help="Set expiry days for imported data")
    parser.add_argument("--yes", action="store_true",
                       help="Skip confirmation prompts")
    
    args = parser.parse_args()
    
    # Execute actions
    if args.stats:
        show_stats(args.db_dir)
    elif args.clean_expired:
        clean_expired(args.db_dir)
    elif args.clear_all:
        clear_all(args.db_dir, confirm=args.yes)
    elif args.clear_type:
        clear_by_type(args.db_dir, args.clear_type)
    elif args.clear_ticker:
        clear_by_ticker(args.db_dir, args.clear_ticker)
    elif args.clear_older_than:
        clear_older_than(args.db_dir, args.clear_older_than)
    elif args.search:
        search(args.db_dir, args.date_from, args.date_to, 
               args.data_type, args.ticker, args.limit)
    elif args.export:
        export_data(args.db_dir, args.export, args.date_from, 
                   args.date_to, args.data_type, args.ticker)
    elif args.import_file:
        import_data(args.db_dir, args.import_file, args.expiry_days)
    elif args.list_types:
        list_types()
    else:
        parser.print_help()


if __name__ == "__main__":
    main()