"""Portable source-checkout command line interface."""

import argparse
import json
import os
import sys
from pathlib import Path

from .profiles import Profile
from .runtime import Runtime, RuntimeError


def parser() -> argparse.ArgumentParser:
    cli = argparse.ArgumentParser(prog='hydra', description='Independent HydraOS VM manager')
    cli.add_argument('--config', type=Path, default=Path(os.environ.get('XDG_CONFIG_HOME', Path.home() / '.config')) / 'hydra')
    cli.add_argument('--state', type=Path, default=Path(os.environ.get('XDG_STATE_HOME', Path.home() / '.local/state')) / 'hydra')
    cli.add_argument('--runtime', type=Path, default=Path(os.environ.get('XDG_RUNTIME_DIR', f'/tmp/hydra-{os.getuid()}')) / 'hydra')
    commands = cli.add_subparsers(dest='command', required=True)
    add = commands.add_parser('add', help='Create a VM profile without starting it')
    add.add_argument('name')
    add.add_argument('--iso', type=Path, required=True)
    add.add_argument('--memory', type=int, default=4096)
    add.add_argument('--cpus', type=int, default=2)
    add.add_argument('--disk-size', default='40G')
    add.add_argument('--graphics', choices=('auto', 'software'), default='auto')
    add.add_argument('--network', choices=('user', 'bridge'), default='user')
    add.add_argument('--bridge', default='hydrabr0')
    commands.add_parser('list', help='List configured VMs')
    status = commands.add_parser('status', help='Query VM state through private QMP')
    status.add_argument('name', nargs='?')
    for command in ('start', 'shutdown', 'stop'):
        cmd = commands.add_parser(command)
        cmd.add_argument('name')
        if command == 'stop':
            cmd.add_argument('--force', action='store_true', required=True)
    return cli


def main(argv: list[str] | None = None) -> int:
    args = parser().parse_args(argv)
    runtime = Runtime(args.config, args.state, args.runtime)
    try:
        if args.command == 'add':
            profile = Profile(args.name, args.iso, args.memory, args.cpus, args.disk_size,
                              args.graphics, args.network, args.bridge)
            runtime.add(profile)
            result = {'name': profile.name, 'status': 'added'}
        elif args.command == 'list':
            result = [{'name': profile.name, 'iso': str(profile.iso)} for profile in runtime.profiles()]
        elif args.command == 'status':
            result = runtime.status(args.name) if args.name else [runtime.status(p.name) for p in runtime.profiles()]
        elif args.command == 'stop':
            result = runtime.stop(args.name, force=args.force)
        else:
            result = getattr(runtime, args.command)(args.name)
        print(json.dumps(result, indent=2))
        return 0
    except (RuntimeError, OSError, ValueError) as exc:
        print(f'hydra: {exc}', file=sys.stderr)
        return 1