"""
Generate Historical Match Data.

This script generates 100+ historical matches with energy scores
and actual winners for backtesting purposes.
"""

import sys
import os
import random
from datetime import datetime, timedelta

# Add parent directory to path for imports
sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))

from sqlalchemy.orm import Session
from app.database import engine, SessionLocal
from app.models.match import Match
from app.models.energy_score import EnergyScore


LEAGUES = [
    "Ligue 1",
    "Premier League",
    "La Liga",
    "Serie A",
    "Bundesliga",
    "Champions League"
]

TEAMS = {
    "Ligue 1": ["PSG", "OM", "Lyon", "Monaco", "Lille", "Nice", "Marseille", "Lens"],
    "Premier League": ["Manchester City", "Liverpool", "Arsenal", "Chelsea", "Man United", "Tottenham", "Newcastle"],
    "La Liga": ["Real Madrid", "Barcelona", "Atletico Madrid", "Sevilla", "Valencia", "Villarreal"],
    "Serie A": ["Juventus", "Inter Milan", "AC Milan", "Napoli", "Roma", "Lazio"],
    "Bundesliga": ["Bayern Munich", "Dortmund", "RB Leipzig", "Leverkusen", "Wolfsburg"],
    "Champions League": ["Real Madrid", "PSG", "Bayern Munich", "Man City", "Barcelona", "Liverpool"]
}


def generate_match_date(base_date: datetime, offset_days: int) -> datetime:
    """Generate a match date with time."""
    date = base_date - timedelta(days=offset_days)
    # Set to a typical match time (e.g., 8 PM)
    return date.replace(hour=20, minute=0, second=0, microsecond=0)


def generate_energy_score() -> float:
    """Generate a random energy score between 30 and 90."""
    return round(random.uniform(30.0, 90.0), 2)


def determine_actual_winner(home_team: str, away_team: str, home_energy: float, away_energy: float) -> str:
    """
    Determine actual winner based on energy difference with some randomness.
    Higher energy has ~70% chance of winning.
    """
    energy_diff = home_energy - away_energy
    rand = random.random()

    # If home has much higher energy, higher chance to win
    if energy_diff > 15:
        winner = "home" if rand < 0.7 else ("away" if rand < 0.9 else "draw")
    elif energy_diff < -15:
        winner = "away" if rand < 0.7 else ("home" if rand < 0.9 else "draw")
    elif energy_diff > 5:
        winner = "home" if rand < 0.6 else ("away" if rand < 0.85 else "draw")
    elif energy_diff < -5:
        winner = "away" if rand < 0.6 else ("home" if rand < 0.85 else "draw")
    else:
        # Close match - more random
        winner = "home" if rand < 0.35 else ("away" if rand < 0.70 else "draw")

    return winner


def generate_historical_matches(num_matches: int = 120) -> list:
    """
    Generate historical match data.

    Args:
        num_matches: Number of matches to generate (default: 120)

    Returns:
        List of tuples (match_data, energy_score_data)
    """
    matches_data = []
    base_date = datetime.now()

    for i in range(num_matches):
        league = random.choice(LEAGUES)
        teams = TEAMS[league]
        home_team, away_team = random.sample(teams, 2)

        home_energy = generate_energy_score()
        away_energy = generate_energy_score()

        match_date = generate_match_date(base_date, i)

        actual_winner = determine_actual_winner(home_team, away_team, home_energy, away_energy)

        match_data = {
            'home_team': home_team,
            'away_team': away_team,
            'date': match_date,
            'league': league,
            'status': 'completed',
            'actual_winner': actual_winner
        }

        energy_score_data = {
            'home_energy': home_energy,
            'away_energy': away_energy,
            'collective_energy': (home_energy + away_energy) / 2,
            'timestamp': match_date
        }

        matches_data.append((match_data, energy_score_data))

    return matches_data


def insert_historical_matches(db: Session, matches_data: list):
    """
    Insert historical matches into database.

    Args:
        db: Database session
        matches_data: List of tuples (match_data, energy_score_data)
    """
    for match_data, energy_data in matches_data:
        # Insert match
        match = Match(**match_data)
        db.add(match)
        db.flush()  # Get the match ID

        # Insert energy score
        energy_score = EnergyScore(
            match_id=match.id,
            **energy_data
        )
        db.add(energy_score)

    db.commit()
    print(f"✅ Successfully inserted {len(matches_data)} historical matches")


def main():
    """Main function to generate and insert historical match data."""
    print("🚀 Generating historical match data for backtesting...\n")

    # Create database session
    db = SessionLocal()

    try:
        # Check if matches already exist
        existing_matches = db.query(Match).filter(
            Match.actual_winner.isnot(None)
        ).count()

        if existing_matches > 0:
            print(f"⚠️  Warning: {existing_matches} historical matches already exist in database")
            response = input("Do you want to add more matches? (y/n): ")
            if response.lower() != 'y':
                print("❌ Aborted")
                return

        # Generate matches
        num_matches = 120
        print(f"📊 Generating {num_matches} historical matches...")
        matches_data = generate_historical_matches(num_matches)

        # Insert matches
        print("💾 Inserting matches into database...")
        insert_historical_matches(db, matches_data)

        # Display summary
        print("\n📈 Summary:")
        print(f"   - Total matches: {num_matches}")

        # Count by league
        league_counts = {}
        for match_data, _ in matches_data:
            league = match_data['league']
            league_counts[league] = league_counts.get(league, 0) + 1

        print(f"   - Matches by league:")
        for league, count in sorted(league_counts.items()):
            print(f"     • {league}: {count}")

        # Count by result
        winner_counts = {'home': 0, 'away': 0, 'draw': 0}
        for match_data, _ in matches_data:
            winner_counts[match_data['actual_winner']] += 1

        print(f"   - Results:")
        print(f"     • Home wins: {winner_counts['home']}")
        print(f"     • Away wins: {winner_counts['away']}")
        print(f"     • Draws: {winner_counts['draw']}")

        print("\n✅ Historical match data generation complete!")
        print("🎯 You can now run backtesting via: POST /api/v1/backtesting/run")

    except Exception as e:
        db.rollback()
        print(f"❌ Error: {str(e)}")
        raise
    finally:
        db.close()


if __name__ == "__main__":
    main()