"""Environment paths and quick navigation."""

import functools
import os
import subprocess
from pathlib import Path

import click

from mycli.config import config
from mycli.utils import handle_errors


@functools.lru_cache(maxsize=1)
def _get_paths() -> dict[str, Path]:
    """Lazy load paths from config."""
    return config.get_all_paths()


@click.group(name="env")
def env_cmd():
    """Environment paths and navigation."""
    pass


@env_cmd.command("goto")
@click.argument("name")
@handle_errors
def goto(name):
    """Print path for cd (use: cd $(mycli env goto <name>))."""
    paths = _get_paths()
    if name not in paths:
        click.echo(f"Unknown path: {name}", err=True)
        click.echo(f"Available: {', '.join(paths.keys())}", err=True)
        raise click.Exit(1)
    click.echo(paths[name])


@env_cmd.command("list")
@handle_errors
def list_paths():
    """List all configured paths."""
    paths = _get_paths()
    max_len = max(len(k) for k in paths.keys())
    for name, path in sorted(paths.items()):
        exists = "✓" if path.exists() else "✗"
        click.echo(f"{name:{max_len}}  {exists}  {path}")


@env_cmd.command("cd")
@click.argument("name")
@handle_errors
def cd_path(name):
    """Change directory (launches new shell)."""
    paths = _get_paths()
    if name not in paths:
        click.echo(f"Unknown path: {name}", err=True)
        raise click.Exit(1)

    target = paths[name]
    if not target.exists():
        click.echo(f"Path does not exist: {target}", err=True)
        raise click.Exit(1)

    shell = os.environ.get("SHELL", "/bin/zsh")
    click.echo(f"Starting shell in: {target}")
    subprocess.run([shell], cwd=target)


@env_cmd.command("status")
@handle_errors
def status():
    """Show environment status."""
    paths = _get_paths()
    click.secho("=== Paths ===", fg="cyan")
    for name, path in sorted(paths.items()):
        exists = "✓" if path.exists() else "✗"
        click.echo(f"  {name:12} [{exists}] {path}")

    click.secho("\n=== OpenFOAM ===", fg="cyan")
    openfoam_path = "/Volumes/OpenFOAM/openfoam/build"
    if Path("/Volumes/OpenFOAM").exists():
        click.secho(f"  Mounted: {openfoam_path}", fg="green")
    else:
        click.secho("  Not mounted", fg="red")