"""CLI interface for git-commit-message-generator."""
from pathlib import Path
from typing import Optional

import click
from rich import print as rprint

from git_commit_generator.changelog_generator import get_changelog_generator
from git_commit_generator.config import Config, get_config
from git_commit_generator.git_utils import get_git_utils
from git_commit_generator.interactive import Action, InteractiveMode, get_interactive_mode
from git_commit_generator.message_generator import MessageGenerator, get_message_generator
from git_commit_generator.ollama_client import get_ollama_client


@click.group()
@click.option(
    "--host",
    default=None,
    help="Ollama server URL",
)
@click.option(
    "--model",
    default=None,
    help="Model to use for generation",
)
@click.pass_context
def main(ctx: click.Context, host: Optional[str], model: Optional[str]) -> None:
    """Git Commit Message Generator CLI.

    A CLI tool that generates git commit messages using local LLMs.
    """
    ctx.ensure_object(dict)
    config = get_config()
    ctx.obj["config"] = config
    ctx.obj["host"] = host or config.ollama_host
    ctx.obj["model"] = model or config.ollama_model


@main.command("generate")
@click.option(
    "--staged/--unstaged",
    default=True,
    help="Include staged (default) or unstaged changes",
)
@click.option(
    "--interactive",
    "-i",
    is_flag=True,
    default=False,
    help="Use interactive mode for message refinement",
)
@click.option(
    "--output",
    "-o",
    type=click.Path(),
    help="Write commit message to file",
)
@click.pass_context
def generate(
    ctx: click.Context,
    staged: bool,
    interactive: bool,
    output: Optional[str],
) -> None:
    """Generate a commit message from staged/unstaged changes."""
    config: Config = ctx.obj["config"]
    host: str = ctx.obj["host"]
    model: str = ctx.obj["model"]

    interactive_mode = get_interactive_mode()

    try:
        ollama_client = get_ollama_client(host=host, model=model)

        if not ollama_client.check_connection():
            interactive_mode.show_error(
                f"Could not connect to Ollama at {host}. "
                "Make sure Ollama is running."
            )
            interactive_mode.show_info(
                "Tip: Run 'ollama serve' to start Ollama server."
            )
            return

        interactive_mode.show_connection_status(True, model)
        interactive_mode.show_info("Generating commit message...")

        message_generator = get_message_generator(
            config=config,
            ollama_client=ollama_client,
        )

        if not interactive:
            message = message_generator.generate(
                staged=staged,
                unstaged=not staged,
                model=model,
            )
            rprint("\n[bold green]Generated commit message:[/bold green]")
            rprint(f"[cyan]{message}[/cyan]")

            if output:
                Path(output).write_text(message)
                interactive_mode.show_info(f"Message written to {output}")

        else:
            _run_interactive_mode(
                message_generator=message_generator,
                interactive_mode=interactive_mode,
                staged=staged,
                unstaged=not staged,
                output=output,
            )

    except ValueError as e:
        interactive_mode.show_error(str(e))
        interactive_mode.show_no_changes_warning()
    except Exception as e:
        interactive_mode.show_error(f"An error occurred: {str(e)}")


def _run_interactive_mode(
    message_generator: MessageGenerator,
    interactive_mode: InteractiveMode,
    staged: bool,
    unstaged: bool,
    output: Optional[str],
) -> None:
    """Run interactive message generation loop."""
    while True:
        try:
            message = message_generator.generate(
                staged=staged,
                unstaged=unstaged,
            )

            action, edited_message = interactive_mode.prompt_for_action(message)

            if action == Action.QUIT:
                interactive_mode.show_info("Cancelled.")
                return
            elif action == Action.REGENERATE:
                interactive_mode.show_info("Regenerating...")
                continue
            elif action == Action.ACCEPT:
                final_message = edited_message or message
                if interactive_mode.confirm_commit(final_message):
                    rprint("\n[bold]Commit message:[/bold]")
                    rprint(f"[green]{final_message}[/green]")

                    if output:
                        Path(output).write_text(final_message)
                        interactive_mode.show_info(f"Message written to {output}")

                    return

        except ValueError as e:
            interactive_mode.show_error(str(e))
            interactive_mode.show_no_changes_warning()
            return
        except Exception as e:
            interactive_mode.show_error(f"An error occurred: {str(e)}")
            return


@main.command("changelog")
@click.option(
    "--since",
    default=None,
    help="Only include commits since this date/tag",
)
@click.option(
    "--limit",
    default=50,
    type=int,
    help="Maximum number of commits to include",
)
@click.option(
    "--output",
    "-o",
    type=click.Path(),
    help="Write changelog to file",
)
@click.option(
    "--simple",
    is_flag=True,
    default=False,
    help="Generate simple changelog without LLM",
)
@click.pass_context
def changelog(
    ctx: click.Context,
    since: Optional[str],
    limit: int,
    output: Optional[str],
    simple: bool,
) -> None:
    """Generate CHANGELOG.md from git history."""
    config: Config = ctx.obj["config"]
    host: str = ctx.obj["host"]
    model: str = ctx.obj["model"]

    interactive_mode = get_interactive_mode()

    try:
        ollama_client = get_ollama_client(host=host, model=model)

        if not simple and not ollama_client.check_connection():
            interactive_mode.show_error(
                f"Could not connect to Ollama at {host}. "
                "Use --simple flag for LLM-free generation."
            )
            return

        if not simple:
            interactive_mode.show_connection_status(True, model)
            interactive_mode.show_info("Generating changelog with LLM...")

            changelog_generator = get_changelog_generator(
                config=config,
                ollama_client=ollama_client,
            )

            changelog = changelog_generator.generate(
                since=since,
                limit=limit,
                output_path=output,
            )
        else:
            interactive_mode.show_info("Generating simple changelog...")
            changelog_generator = get_changelog_generator(config=config)
            changelog = changelog_generator.generate_simple(
                since=since,
                limit=limit,
                output_path=output,
            )

        rprint("\n[bold green]Generated Changelog:[/bold green]")
        rprint(changelog)

        if output:
            interactive_mode.show_info(f"Changelog written to {output}")

    except ValueError as e:
        interactive_mode.show_error(str(e))
    except Exception as e:
        interactive_mode.show_error(f"An error occurred: {str(e)}")


@main.command("config")
@click.option(
    "--show",
    is_flag=True,
    default=False,
    help="Show current configuration",
)
@click.option(
    "--host",
    default=None,
    help="Set Ollama host URL",
)
@click.option(
    "--model",
    default=None,
    help="Set default model",
)
@click.pass_context
def config_cmd(
    ctx: click.Context,
    show: bool,
    host: Optional[str],
    model: Optional[str],
) -> None:
    """Configure git-commit-message-generator settings."""
    config: Config = ctx.obj["config"]

    if show:
        rprint("[bold]Current Configuration:[/bold]")
        rprint(f"  Ollama Host: {config.ollama_host}")
        rprint(f"  Ollama Model: {config.ollama_model}")
        rprint(f"  Prompt Directory: {config.prompt_dir}")
        return

    if host or model:
        config_path = config.config_path or "./config.yaml"
        import yaml
        config_data = {
            "ollama_host": host or config.ollama_host,
            "ollama_model": model or config.ollama_model,
        }
        with open(config_path, "w") as f:
            yaml.dump(config_data, f)
        rprint(f"[green]Configuration saved to {config_path}[/green]")
    else:
        click.echo(main.get_help(ctx))


@main.command("status")
@click.pass_context
def status(ctx: click.Context) -> None:
    """Check system status and configuration."""
    config: Config = ctx.obj["config"]
    host: str = ctx.obj["host"]
    model: str = ctx.obj["model"]

    interactive_mode = get_interactive_mode()

    rprint("[bold]Git Commit Message Generator Status[/bold]\n")

    rprint("[bold]Configuration:[/bold]")
    rprint(f"  Ollama Host: {host}")
    rprint(f"  Default Model: {model}")
    rprint(f"  Prompt Directory: {config.prompt_dir}")

    try:
        ollama_client = get_ollama_client(host=host, model=model)
        connected = ollama_client.check_connection()
        interactive_mode.show_connection_status(connected, model)

        if connected:
            models = ollama_client.list_models()
            rprint("\n[bold]Available Models:[/bold]")
            if models:
                for m in models[:5]:
                    rprint(f"  - {m.get('name', 'unknown')}")
                if len(models) > 5:
                    rprint(f"  ... and {len(models) - 5} more")
            else:
                rprint("  No models found")

    except Exception as e:
        interactive_mode.show_error(f"Could not connect to Ollama: {e}")

    try:
        git_utils = get_git_utils()
        is_repo = git_utils.is_repo()
        rprint("\n[bold]Git Repository:[/bold]")
        rprint(f"  Repository Detected: {'Yes' if is_repo else 'No'}")
    except Exception:
        rprint("\n[bold]Git Repository:[/bold]")
        rprint("  Not in a git repository")


@main.command("help")
def help_cmd() -> None:
    """Show help information."""
    interactive_mode = get_interactive_mode()
    interactive_mode.show_help()