"""SneakyCode entrypoint — argument parsing, config loading, and interactive REPL."""

import argparse
import asyncio
import sys
from pathlib import Path

import structlog

from app.agent.context import SessionContext
from app.agent.loop import AgentLoop
from app.models.config import AppConfig, load_config
from app.services.llm import LLMClient, LLMConnectionError, LLMError
from app.services.permissions import PermissionsService
from app.services.streaming import StreamHandler
from app.tools.registry import create_default_registry
from app.utils.display import (
    print_banner,
    print_error,
    print_history,
    print_info,
    print_success,
    print_user_message,
    print_warning,
)
from app.utils.logging import console, get_logger, setup_logging


def parse_args() -> argparse.Namespace:
    """Parse command-line arguments.

    Returns:
        Parsed arguments namespace.
    """
    parser = argparse.ArgumentParser(
        prog="sneakycode",
        description="SneakyCode — A privacy-first local AI coding agent",
    )
    parser.add_argument(
        "--config",
        type=Path,
        default=None,
        help="Path to config YAML file (default: config/config.yaml)",
    )
    parser.add_argument(
        "-v", "--verbose",
        action="store_true",
        default=False,
        help="Enable verbose (DEBUG) logging",
    )
    parser.add_argument(
        "--log-file",
        type=Path,
        default=None,
        help="Path to log file for persistent logging",
    )
    return parser.parse_args()


async def _preflight(config: AppConfig) -> None:
    """Check that Ollama is reachable and the configured model is available."""
    async with LLMClient(config.llm) as client:
        await client.preflight_check()


async def _run_repl(
    ctx: SessionContext,
    config: AppConfig,
    logger: structlog.stdlib.BoundLogger,
) -> None:
    """Run the interactive REPL loop with streaming LLM responses.

    Args:
        ctx: Session context for conversation state.
        config: Application configuration.
        logger: Structured logger instance.
    """
    registry = create_default_registry(config.agent.workspace_root, config)
    permissions = PermissionsService(config.permissions)

    async with LLMClient(config.llm) as client:
        handler = StreamHandler(config.display)
        agent = AgentLoop(config, ctx, client, handler, registry, permissions)

        while True:
            try:
                user_input = console.input("[bold cyan]> [/bold cyan]")
            except (KeyboardInterrupt, EOFError):
                console.print("\n[dim]Goodbye![/dim]")
                break

            user_input = user_input.strip()
            if not user_input:
                continue

            # Handle slash commands
            if user_input.startswith("/"):
                command = user_input.lower()
                if command == "/quit":
                    console.print("[dim]Goodbye![/dim]")
                    break
                elif command == "/history":
                    print_history(ctx.get_history())
                elif command == "/clear":
                    ctx.clear_history()
                    print_success("Conversation history cleared.")
                else:
                    print_warning(f"Unknown command: {user_input}")
                continue

            print_user_message(user_input)
            await agent.run_turn(user_input)
            logger.debug("turn_complete", message_count=ctx.message_count)


def main() -> None:
    """Main entrypoint: load config, setup logging, launch interactive REPL."""
    args = parse_args()

    # Setup logging first
    setup_logging(
        log_file=args.log_file,
        verbose=args.verbose,
    )
    logger = get_logger(__name__)

    # Load configuration
    try:
        config = load_config(config_path=args.config)
    except (FileNotFoundError, ValueError) as e:
        print_error(f"Configuration error: {e}")
        sys.exit(1)

    logger.info("config_loaded", model=config.llm.model, endpoint=config.llm.endpoint)

    # Print startup info
    print_banner()
    print_info(f"Model: {config.llm.model}")
    print_info(f"Endpoint: {config.llm.endpoint}")
    print_info(f"Workspace: {config.agent.workspace_root}")

    if args.verbose:
        print_info("Verbose mode enabled")

    # Preflight: check Ollama is reachable and model exists
    try:
        asyncio.run(_preflight(config))
    except LLMConnectionError as e:
        print_error(str(e))
        sys.exit(1)
    except LLMError as e:
        print_error(str(e))
        sys.exit(1)

    print_success("Ollama connected, model ready.")

    # Create session and start REPL
    ctx = SessionContext(config)
    logger.info("startup_complete")

    print_info("Commands: /quit, /history, /clear")
    asyncio.run(_run_repl(ctx, config, logger))


if __name__ == "__main__":
    main()