"""
NOVA Command Line Interface
"""

import argparse
import sys
from pathlib import Path

# Add parent directory to path
sys.path.insert(0, str(Path(__file__).parent.parent))

from nova_core import NovaTransformer, ModelConfig, MODEL_125M, MODEL_350M, MODEL_1_3B
from nova_tokenizer import NovaTokenizer, train_tokenizer
from nova_train import NovaTrainer, TrainingConfig
from nova_chat import ChatAgent, PersonaLoader
from nova_data import DataPipeline
from nova_evo import EvolutionEngine, FitnessEvaluator, EvolutionConfig


def cmd_init(args):
    """Initialize a new NOVA project"""
    print("Initializing NOVA project...")

    # Create toy dataset
    pipeline = DataPipeline()
    toy_path = pipeline.create_toy_dataset()

    print(f"\n✓ NOVA initialized!")
    print(f"  Toy dataset: {toy_path}")
    print(f"\nNext steps:")
    print(f"  1. Train tokenizer: nova tokenizer train --input {toy_path}")
    print(f"  2. Train model: nova train --config configs/model/125M.yaml")
    print(f"  3. Chat: nova chat cli")


def cmd_tokenizer_train(args):
    """Train a tokenizer"""
    print(f"Training tokenizer on {args.input}...")

    model_path = train_tokenizer(
        input_files=[args.input],
        model_prefix=args.output,
        vocab_size=args.vocab_size,
        model_type=args.model_type,
    )

    print(f"\n✓ Tokenizer saved: {model_path}")


def cmd_train(args):
    """Train a model"""
    print("Training NOVA model...")

    # Load model config
    if args.size == "125m":
        model_config = MODEL_125M
    elif args.size == "350m":
        model_config = MODEL_350M
    elif args.size == "1.3b":
        model_config = MODEL_1_3B
    else:
        raise ValueError(f"Unknown size: {args.size}")

    # Create model
    model = NovaTransformer(model_config)

    print(f"Model: {model.get_num_params() / 1e6:.1f}M parameters")

    # TODO: Load dataset and create dataloader
    # For now, this is a placeholder
    print("\n⚠️ Training not fully implemented - requires dataset")
    print("See nova_train/trainer.py for implementation")


def cmd_chat_cli(args):
    """Start CLI chat"""
    print("NOVA Chat Interface")
    print("=" * 60)

    # Load model and tokenizer
    # TODO: Implement model/tokenizer loading from checkpoint

    print("\n⚠️ Chat requires trained model and tokenizer")
    print("Please train a model first with: nova train")


def cmd_chat_serve(args):
    """Start REST API server"""
    print(f"Starting NOVA chat API server on {args.host}:{args.port}...")

    # TODO: Implement FastAPI server
    print("\n⚠️ REST API not fully implemented")
    print("See nova_chat/ for implementation")


def cmd_evo_run(args):
    """Run evolution"""
    print("Starting NOVA-EVO...")

    # TODO: Implement evolution with dataset
    print("\n⚠️ Evolution requires dataset and compute budget")
    print("See nova_evo/ for implementation")


def cmd_data_build(args):
    """Build dataset"""
    pipeline = DataPipeline()

    if args.source:
        pipeline.download_source(args.source, dry_run=args.dry_run)
    else:
        print("Available sources:")
        from nova_data import LegalDatasetRegistry

        for source in LegalDatasetRegistry.list_sources():
            print(f"\n  {source.name}")
            print(f"    License: {source.license.value}")
            print(f"    Size: {source.estimated_size_gb} GB")
            print(f"    {source.description}")


def main():
    """Main CLI entry point"""
    parser = argparse.ArgumentParser(
        description="NOVA - Neuro-Optimizing Versatile Agent",
        formatter_class=argparse.RawDescriptionHelpFormatter,
    )

    subparsers = parser.add_subparsers(dest='command', help='Commands')

    # Init
    parser_init = subparsers.add_parser('init', help='Initialize NOVA project')
    parser_init.set_defaults(func=cmd_init)

    # Tokenizer
    parser_tok = subparsers.add_parser('tokenizer', help='Tokenizer commands')
    tok_sub = parser_tok.add_subparsers(dest='tokenizer_command')

    tok_train = tok_sub.add_parser('train', help='Train tokenizer')
    tok_train.add_argument('--input', required=True, help='Input text file')
    tok_train.add_argument('--output', default='tokenizer', help='Output prefix')
    tok_train.add_argument('--vocab-size', type=int, default=32000)
    tok_train.add_argument('--model-type', default='bpe', choices=['bpe', 'unigram'])
    tok_train.set_defaults(func=cmd_tokenizer_train)

    # Train
    parser_train = subparsers.add_parser('train', help='Train model')
    parser_train.add_argument('--size', default='125m', choices=['125m', '350m', '1.3b'])
    parser_train.add_argument('--config', help='Training config file')
    parser_train.set_defaults(func=cmd_train)

    # Chat
    parser_chat = subparsers.add_parser('chat', help='Chat interface')
    chat_sub = parser_chat.add_subparsers(dest='chat_command')

    chat_cli = chat_sub.add_parser('cli', help='CLI chat')
    chat_cli.add_argument('--persona', help='Persona file')
    chat_cli.set_defaults(func=cmd_chat_cli)

    chat_serve = chat_sub.add_parser('serve', help='REST API server')
    chat_serve.add_argument('--host', default='0.0.0.0')
    chat_serve.add_argument('--port', type=int, default=8000)
    chat_serve.set_defaults(func=cmd_chat_serve)

    # Evolution
    parser_evo = subparsers.add_parser('evo', help='Evolution commands')
    evo_sub = parser_evo.add_subparsers(dest='evo_command')

    evo_run = evo_sub.add_parser('run', help='Run evolution')
    evo_run.add_argument('--budget', default='small', choices=['small', 'medium', 'large'])
    evo_run.set_defaults(func=cmd_evo_run)

    # Data
    parser_data = subparsers.add_parser('data', help='Data commands')
    data_sub = parser_data.add_subparsers(dest='data_command')

    data_build = data_sub.add_parser('build', help='Build dataset')
    data_build.add_argument('--source', help='Source name')
    data_build.add_argument('--dry-run', action='store_true')
    data_build.set_defaults(func=cmd_data_build)

    # Parse and execute
    args = parser.parse_args()

    if hasattr(args, 'func'):
        args.func(args)
    else:
        parser.print_help()


if __name__ == '__main__':
    main()