#!/usr/bin/env python3
"""
Analyze NMRGym balanced datasets and generate visualizations
"""
import pickle
import numpy as np
import matplotlib.pyplot as plt
import seaborn as sns
from collections import Counter
from rdkit import Chem
from rdkit.Chem.Scaffolds import MurckoScaffold
import json

# Set style
sns.set_style("whitegrid")
plt.rcParams['font.size'] = 10
plt.rcParams['figure.dpi'] = 300

# Functional group names (index 0-21)
FG_NAMES = [
    "Alcohol", "Carboxylic Acid", "Ester", "Ether", "Aldehyde", "Ketone",
    "Alkene", "Alkyne", "Benzene", "Primary Amine", "Secondary Amine",
    "Tertiary Amine", "Amide", "Cyano", "Fluorine", "Chlorine",
    "Bromine", "Iodine", "Sulfonamide", "Sulfone", "Sulfide", "Phosphoric Acid"
]

def load_dataset(pkl_path):
    """Load a pickle file"""
    with open(pkl_path, "rb") as f:
        return pickle.load(f)

def get_scaffold(smiles):
    """Get Bemis-Murcko scaffold"""
    try:
        mol = Chem.MolFromSmiles(smiles)
        if mol is None:
            return None
        scaffold = MurckoScaffold.GetScaffoldForMol(mol)
        return Chem.MolToSmiles(scaffold)
    except:
        return None

def get_element_counts(smiles):
    """Get element counts from SMILES"""
    try:
        mol = Chem.MolFromSmiles(smiles)
        if mol is None:
            return {}
        element_counts = {}
        for atom in mol.GetAtoms():
            symbol = atom.GetSymbol()
            element_counts[symbol] = element_counts.get(symbol, 0) + 1
        return element_counts
    except:
        return {}

def analyze_dataset(dataset, name):
    """Analyze a single dataset"""
    print(f"\n{'='*60}")
    print(f"Analyzing {name}")
    print(f"{'='*60}")

    stats = {
        'name': name,
        'total_records': len(dataset),
        'unique_smiles': len(set(d['smiles'] for d in dataset)),
        'scaffolds': [],
        'functional_groups': np.zeros(22),
        'elements': Counter(),
        'h_spectra': 0,
        'c_spectra': 0,
    }

    all_smiles = set()
    scaffold_counter = Counter()

    for record in dataset:
        smiles = record['smiles']
        all_smiles.add(smiles)

        # Count spectra
        if 'h_shift' in record and record['h_shift'] is not None and len(record['h_shift']) > 0:
            stats['h_spectra'] += 1
        if 'c_shift' in record and record['c_shift'] is not None and len(record['c_shift']) > 0:
            stats['c_spectra'] += 1

        # Get scaffold
        scaffold = get_scaffold(smiles)
        if scaffold:
            scaffold_counter[scaffold] += 1

        # Functional groups
        if 'fg_onehot' in record:
            stats['functional_groups'] += record['fg_onehot']

        # Element counts
        elem_counts = get_element_counts(smiles)
        for elem, count in elem_counts.items():
            stats['elements'][elem] += count

    stats['unique_scaffolds'] = len(scaffold_counter)
    stats['top_scaffolds'] = scaffold_counter.most_common(10)

    print(f"Total records: {stats['total_records']:,}")
    print(f"Unique SMILES: {stats['unique_smiles']:,}")
    print(f"Unique scaffolds: {stats['unique_scaffolds']:,}")
    print(f"¹H NMR spectra: {stats['h_spectra']:,}")
    print(f"¹³C NMR spectra: {stats['c_spectra']:,}")
    print(f"\nTop 5 elements:")
    for elem, count in stats['elements'].most_common(5):
        print(f"  {elem}: {count:,}")

    return stats

def plot_functional_groups(train_stats, val_stats, test_stats, output_path):
    """Plot functional group distribution"""
    fig, ax = plt.subplots(figsize=(14, 6))

    x = np.arange(len(FG_NAMES))
    width = 0.25

    train_fg = train_stats['functional_groups']
    val_fg = val_stats['functional_groups']
    test_fg = test_stats['functional_groups']

    ax.bar(x - width, train_fg, width, label='Train', alpha=0.8)
    ax.bar(x, val_fg, width, label='Val', alpha=0.8)
    ax.bar(x + width, test_fg, width, label='Test', alpha=0.8)

    ax.set_xlabel('Functional Group')
    ax.set_ylabel('Count')
    ax.set_title('Functional Group Distribution Across Datasets')
    ax.set_xticks(x)
    ax.set_xticklabels(FG_NAMES, rotation=45, ha='right')
    ax.legend()
    ax.grid(axis='y', alpha=0.3)

    plt.tight_layout()
    plt.savefig(output_path, dpi=300, bbox_inches='tight')
    plt.close()
    print(f"Saved: {output_path}")

def plot_element_distribution(train_stats, val_stats, test_stats, output_path):
    """Plot element distribution for common elements"""
    # Focus on common organic elements
    common_elements = ['C', 'H', 'O', 'N', 'F', 'Cl', 'Br', 'S', 'P', 'I']

    fig, ax = plt.subplots(figsize=(12, 6))

    # Get counts for each element
    train_counts = [train_stats['elements'].get(e, 0) for e in common_elements]
    val_counts = [val_stats['elements'].get(e, 0) for e in common_elements]
    test_counts = [test_stats['elements'].get(e, 0) for e in common_elements]

    x = np.arange(len(common_elements))
    width = 0.25

    ax.bar(x - width, train_counts, width, label='Train', alpha=0.8)
    ax.bar(x, val_counts, width, label='Val', alpha=0.8)
    ax.bar(x + width, test_counts, width, label='Test', alpha=0.8)

    ax.set_xlabel('Element')
    ax.set_ylabel('Total Count')
    ax.set_title('Element Distribution Across Datasets')
    ax.set_xticks(x)
    ax.set_xticklabels(common_elements)
    ax.legend()
    ax.grid(axis='y', alpha=0.3)
    ax.set_yscale('log')

    plt.tight_layout()
    plt.savefig(output_path, dpi=300, bbox_inches='tight')
    plt.close()
    print(f"Saved: {output_path}")

def plot_dataset_overview(train_stats, val_stats, test_stats, output_path):
    """Plot overview of dataset statistics"""
    fig, axes = plt.subplots(2, 2, figsize=(14, 10))

    # 1. Total records and unique SMILES
    ax = axes[0, 0]
    datasets = ['Train', 'Val', 'Test']
    total_records = [train_stats['total_records'], val_stats['total_records'], test_stats['total_records']]
    unique_smiles = [train_stats['unique_smiles'], val_stats['unique_smiles'], test_stats['unique_smiles']]

    x = np.arange(len(datasets))
    width = 0.35

    ax.bar(x - width/2, total_records, width, label='Total Records', alpha=0.8)
    ax.bar(x + width/2, unique_smiles, width, label='Unique SMILES', alpha=0.8)
    ax.set_ylabel('Count')
    ax.set_title('Dataset Size Comparison')
    ax.set_xticks(x)
    ax.set_xticklabels(datasets)
    ax.legend()
    ax.grid(axis='y', alpha=0.3)

    # Add value labels on bars
    for i, (tr, us) in enumerate(zip(total_records, unique_smiles)):
        ax.text(i - width/2, tr, f'{tr:,}', ha='center', va='bottom', fontsize=8)
        ax.text(i + width/2, us, f'{us:,}', ha='center', va='bottom', fontsize=8)

    # 2. Unique scaffolds
    ax = axes[0, 1]
    unique_scaffolds = [train_stats['unique_scaffolds'], val_stats['unique_scaffolds'], test_stats['unique_scaffolds']]

    ax.bar(datasets, unique_scaffolds, alpha=0.8, color='coral')
    ax.set_ylabel('Count')
    ax.set_title('Unique Scaffolds')
    ax.grid(axis='y', alpha=0.3)

    for i, count in enumerate(unique_scaffolds):
        ax.text(i, count, f'{count:,}', ha='center', va='bottom', fontsize=9)

    # 3. NMR spectra types
    ax = axes[1, 0]
    h_spectra = [train_stats['h_spectra'], val_stats['h_spectra'], test_stats['h_spectra']]
    c_spectra = [train_stats['c_spectra'], val_stats['c_spectra'], test_stats['c_spectra']]

    x = np.arange(len(datasets))
    width = 0.35

    ax.bar(x - width/2, h_spectra, width, label='¹H NMR', alpha=0.8)
    ax.bar(x + width/2, c_spectra, width, label='¹³C NMR', alpha=0.8)
    ax.set_ylabel('Count')
    ax.set_title('NMR Spectra Types')
    ax.set_xticks(x)
    ax.set_xticklabels(datasets)
    ax.legend()
    ax.grid(axis='y', alpha=0.3)

    # 4. Top 5 elements (train set)
    ax = axes[1, 1]
    top_elements = train_stats['elements'].most_common(5)
    elements = [e[0] for e in top_elements]
    counts = [e[1] for e in top_elements]

    ax.bar(elements, counts, alpha=0.8, color='skyblue')
    ax.set_ylabel('Total Count')
    ax.set_title('Top 5 Elements (Train Set)')
    ax.grid(axis='y', alpha=0.3)
    ax.set_yscale('log')

    plt.tight_layout()
    plt.savefig(output_path, dpi=300, bbox_inches='tight')
    plt.close()
    print(f"Saved: {output_path}")

def plot_scaffold_diversity(train_stats, val_stats, test_stats, output_path):
    """Plot scaffold diversity comparison"""
    fig, ax = plt.subplots(figsize=(10, 6))

    datasets = ['Train', 'Val', 'Test']
    total_records = [train_stats['total_records'], val_stats['total_records'], test_stats['total_records']]
    unique_scaffolds = [train_stats['unique_scaffolds'], val_stats['unique_scaffolds'], test_stats['unique_scaffolds']]

    # Calculate scaffold diversity ratio
    diversity_ratio = [s/r for s, r in zip(unique_scaffolds, total_records)]

    x = np.arange(len(datasets))
    width = 0.6

    bars = ax.bar(x, diversity_ratio, width, alpha=0.8, color=['#1f77b4', '#ff7f0e', '#2ca02c'])
    ax.set_ylabel('Scaffold Diversity Ratio')
    ax.set_title('Scaffold Diversity (Unique Scaffolds / Total Records)')
    ax.set_xticks(x)
    ax.set_xticklabels(datasets)
    ax.grid(axis='y', alpha=0.3)
    ax.set_ylim(0, 1)

    # Add value labels
    for i, (bar, ratio) in enumerate(zip(bars, diversity_ratio)):
        height = bar.get_height()
        ax.text(bar.get_x() + bar.get_width()/2., height,
                f'{ratio:.3f}\n({unique_scaffolds[i]:,}/{total_records[i]:,})',
                ha='center', va='bottom', fontsize=9)

    plt.tight_layout()
    plt.savefig(output_path, dpi=300, bbox_inches='tight')
    plt.close()
    print(f"Saved: {output_path}")

def main():
    # File paths
    train_path = "/gemini/code/NMRGym/NMRGym_train_balanced.pkl"
    val_path = "/gemini/code/NMRGym/NMRGym_val_balanced.pkl"
    test_path = "/gemini/code/NMRGym/NMRGym_test_balanced.pkl"

    # Load datasets
    print("Loading datasets...")
    train_data = load_dataset(train_path)
    val_data = load_dataset(val_path)
    test_data = load_dataset(test_path)

    # Analyze each dataset
    train_stats = analyze_dataset(train_data, "Train (Balanced)")
    val_stats = analyze_dataset(val_data, "Val (Balanced)")
    test_stats = analyze_dataset(test_data, "Test (Balanced)")

    # Generate visualizations
    print("\n" + "="*60)
    print("Generating visualizations...")
    print("="*60)

    plot_dataset_overview(train_stats, val_stats, test_stats,
                         "/gemini/code/NMRGym/dataset_overview.png")

    plot_functional_groups(train_stats, val_stats, test_stats,
                          "/gemini/code/NMRGym/functional_groups.png")

    plot_element_distribution(train_stats, val_stats, test_stats,
                             "/gemini/code/NMRGym/element_distribution.png")

    plot_scaffold_diversity(train_stats, val_stats, test_stats,
                           "/gemini/code/NMRGym/scaffold_diversity.png")

    # Save statistics as JSON
    summary = {
        'train': {
            'total_records': train_stats['total_records'],
            'unique_smiles': train_stats['unique_smiles'],
            'unique_scaffolds': train_stats['unique_scaffolds'],
            'h_spectra': train_stats['h_spectra'],
            'c_spectra': train_stats['c_spectra'],
        },
        'val': {
            'total_records': val_stats['total_records'],
            'unique_smiles': val_stats['unique_smiles'],
            'unique_scaffolds': val_stats['unique_scaffolds'],
            'h_spectra': val_stats['h_spectra'],
            'c_spectra': val_stats['c_spectra'],
        },
        'test': {
            'total_records': test_stats['total_records'],
            'unique_smiles': test_stats['unique_smiles'],
            'unique_scaffolds': test_stats['unique_scaffolds'],
            'h_spectra': test_stats['h_spectra'],
            'c_spectra': test_stats['c_spectra'],
        }
    }

    with open('/gemini/code/NMRGym/dataset_stats.json', 'w') as f:
        json.dump(summary, f, indent=2)
    print("\nSaved: /gemini/code/NMRGym/dataset_stats.json")

    # Print final summary table
    print("\n" + "="*60)
    print("FINAL SUMMARY")
    print("="*60)
    print(f"{'Dataset':<15} {'Records':>10} {'Unique SMILES':>15} {'Scaffolds':>12} {'¹H NMR':>10} {'¹³C NMR':>10}")
    print("-" * 85)
    for name, stats in [('Train', train_stats), ('Val', val_stats), ('Test', test_stats)]:
        print(f"{name:<15} {stats['total_records']:>10,} {stats['unique_smiles']:>15,} {stats['unique_scaffolds']:>12,} "
              f"{stats['h_spectra']:>10,} {stats['c_spectra']:>10,}")

    total_records = train_stats['total_records'] + val_stats['total_records'] + test_stats['total_records']
    total_unique = train_stats['unique_smiles'] + val_stats['unique_smiles'] + test_stats['unique_smiles']
    total_scaffolds = train_stats['unique_scaffolds'] + val_stats['unique_scaffolds'] + test_stats['unique_scaffolds']
    total_h = train_stats['h_spectra'] + val_stats['h_spectra'] + test_stats['h_spectra']
    total_c = train_stats['c_spectra'] + val_stats['c_spectra'] + test_stats['c_spectra']

    print("-" * 85)
    print(f"{'Total':<15} {total_records:>10,} {total_unique:>15,} {total_scaffolds:>12,} "
          f"{total_h:>10,} {total_c:>10,}")
    print("="*60 + "\n")

if __name__ == "__main__":
    main()