"""
XGBoost Market Model Trainer (Basketball)
=========================================
Trains specialized XGBoost models for basketball betting markets.
Models:
  1. ML (Match Result) - Binary (Home Win / Away Win)
  2. Totals (Over/Under) - Binary (Over / Under dynamic line)
  3. Spread (Handicap) - Binary (Home Cover / Away Cover)

Usage:
  python3 scripts/train_basketball_markets.py
"""

import os
import sys
import pickle
import pandas as pd
import xgboost as xgb
from sklearn.model_selection import train_test_split
from sklearn.metrics import accuracy_score, classification_report, roc_auc_score

# Config
AI_ENGINE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
DATA_PATH = os.path.join(AI_ENGINE_DIR, "data", "basketball_training_data.csv")
MODELS_DIR = os.path.join(AI_ENGINE_DIR, "models", "xgboost", "basketball")

os.makedirs(MODELS_DIR, exist_ok=True)

# Feature Columns 
FEATURES = [
    # Form
    "home_points_avg", "home_conceded_avg",
    "away_points_avg", "away_conceded_avg",
    "home_winning_streak", "away_winning_streak",
    "home_win_rate", "away_win_rate",
    
    # H2H
    "h2h_total_matches", "h2h_home_win_rate",
    "h2h_avg_points", "h2h_over140_rate",
    
    # Odds
    "odds_ml_h", "odds_ml_a",
    "odds_tot_o", "odds_tot_u", "odds_tot_line",
    "odds_spread_h", "odds_spread_a", "odds_spread_line"
]

def load_data():
    if not os.path.exists(DATA_PATH):
        print(f"❌ Data file not found: {DATA_PATH}")
        sys.exit(1)
        
    print(f"📦 Loading data from {DATA_PATH}...")
    df = pd.read_csv(DATA_PATH)
    df.fillna(0, inplace=True)
    print(f"   Shape: {df.shape}")
    return df

def train_binary_model(df, target_col, model_name):
    """Generic trainer for Binary XGBoost models (ML, Totals, Spread)."""
    print(f"\n🚀 Training {model_name} (Target: {target_col})...")
    
    valid_df = df[df[target_col].notna()].copy()
    if valid_df.empty:
        print(f"   ⚠️ No valid data for {target_col}, skipping.")
        return

    X = valid_df[FEATURES]
    y = valid_df[target_col].astype(int)
    
    X_train, X_test, y_train, y_test = train_test_split(
        X, y, test_size=0.2, random_state=42, stratify=y
    )
    
    params = {
        'objective': 'binary:logistic',
        'eval_metric': 'logloss',
        'eta': 0.05,
        'max_depth': 6,
        'subsample': 0.8,
        'colsample_bytree': 0.8,
        'nthread': 4,
        'seed': 42
    }
    
    model = xgb.XGBClassifier(**params, n_estimators=1000, early_stopping_rounds=50)
        
    model.fit(
        X_train, y_train,
        eval_set=[(X_test, y_test)],
        verbose=False
    )
    
    y_pred = model.predict(X_test)
    y_prob = model.predict_proba(X_test)[:, 1]
    
    acc = accuracy_score(y_test, y_pred)
    try:
        auc = roc_auc_score(y_test, y_prob)
    except:
        auc = 0.0
        
    print(f"   ✅ Finished! Best Iteration: {model.best_iteration}")
    print(f"   📊 Accuracy: {acc:.4f} | ROC AUC: {auc:.4f}")
    print(classification_report(y_test, y_pred, zero_division=0))
    
    # Save Model
    model_path = os.path.join(MODELS_DIR, f"{model_name}.pkl")
    with open(model_path, "wb") as f:
        pickle.dump(model, f)
    print(f"   💾 Saved to {model_path}")
    
    # Save Top Features
    try:
        booster = model.get_booster()
        importance = booster.get_score(importance_type="gain")
        sorted_imp = sorted(importance.items(), key=lambda x: x[1], reverse=True)[:5]
        print("   🔍 Top 5 Features (Gain):")
        for ft, score in sorted_imp:
            print(f"      - {ft}: {score:.2f}")
    except Exception as e:
        print(f"   ⚠️ Could not extract feature importance: {e}")

if __name__ == "__main__":
    df = load_data()
    
    # 1. Moneyline (ML) Model -> Targets Home Win (0) vs Away Win (1)
    train_binary_model(df, "label_ml", "basketball_ml_v1")
    
    # 2. Totals (Over/Under) Model -> Targets Under (0) vs Over (1) against 'odds_tot_line'
    train_binary_model(df, "label_tot", "basketball_tot_v1")
    
    # 3. Spread (Handicap) Model -> Targets Away Cover (0) vs Home Cover (1) against 'odds_spread_line'
    train_binary_model(df, "label_spread", "basketball_spread_v1")
    
    print("\n🎉 All Basketball Models Trained Successfully!")