"""Configuration management commands."""

import json
import os
from pathlib import Path

import click

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


@click.group(name="config")
def config_cmd():
    """Manage mycli configuration."""
    pass


@config_cmd.command("show")
def show():
    """Show current configuration."""
    config.show()


@config_cmd.command("get")
@click.argument("key")
def get_value(key):
    """Get a configuration value by key (dot notation).

    Examples:
        mycli config get paths.research
        mycli config get ssh_hosts.tianhe.port
        mycli config get api_keys.deepseek
    """
    value = config.get(key)
    if value is not None:
        if isinstance(value, dict):
            print(json.dumps(value, indent=2, ensure_ascii=False))
        else:
            print(value)
    else:
        click.echo(f"Key not found: {key}", err=True)
        raise click.Exit(1)


@config_cmd.command("set")
@click.argument("key")
@click.argument("value")
@click.option("--json", "is_json", is_flag=True, help="Parse value as JSON")
def set_value(key, value, is_json):
    """Set a configuration value.

    Examples:
        mycli config set paths.newpath ~/Documents/new
        mycli config set api_keys.newkey abc123
        mycli config set --json ssh_hosts.newhost '{"host":"user@host","port":22}'
    """
    # Load current config
    config_path = config._config_path
    with open(config_path) as f:
        data = json.load(f)

    # Parse value
    if is_json:
        try:
            parsed_value = json.loads(value)
        except json.JSONDecodeError as e:
            click.echo(f"Invalid JSON: {e}", err=True)
            raise click.Exit(1)
    else:
        parsed_value = value

    # Navigate to nested key
    keys = key.split(".")
    target = data
    for k in keys[:-1]:
        if k not in target:
            target[k] = {}
        target = target[k]

    # Set value
    target[keys[-1]] = parsed_value

    # Save
    with open(config_path, "w") as f:
        json.dump(data, f, indent=2, ensure_ascii=False)
        f.write("\n")

    click.secho(f"Set {key} = {parsed_value}", fg="green")


@config_cmd.command("delete")
@click.argument("key")
@click.option("--yes", "-y", is_flag=True, help="Skip confirmation")
def delete_value(key, yes):
    """Delete a configuration key.

    Examples:
        mycli config delete api_keys.oldkey
        mycli config delete paths.oldpath
    """
    # Check if exists
    if config.get(key) is None:
        click.echo(f"Key not found: {key}", err=True)
        raise click.Exit(1)

    if not yes:
        click.confirm(f"Delete '{key}'?", abort=True)

    # Load current config
    config_path = config._config_path
    with open(config_path) as f:
        data = json.load(f)

    # Navigate and delete
    keys = key.split(".")
    target = data
    for k in keys[:-1]:
        if k not in target:
            click.echo(f"Key not found: {key}", err=True)
            raise click.Exit(1)
        target = target[k]

    if keys[-1] in target:
        del target[keys[-1]]
    else:
        click.echo(f"Key not found: {key}", err=True)
        raise click.Exit(1)

    # Save
    with open(config_path, "w") as f:
        json.dump(data, f, indent=2, ensure_ascii=False)
        f.write("\n")

    click.secho(f"Deleted {key}", fg="green")


@config_cmd.command("list")
def list_keys():
    """List all top-level configuration keys."""
    config_path = config._config_path
    with open(config_path) as f:
        data = json.load(f)

    click.secho("Configuration sections:", fg="cyan")
    for key in sorted(data.keys()):
        value = data[key]
        type_str = type(value).__name__
        if isinstance(value, dict):
            count = len(value)
            click.echo(f"  {key:20} ({type_str}, {count} items)")
        elif isinstance(value, list):
            click.echo(f"  {key:20} ({type_str}, {len(value)} items)")
        else:
            click.echo(f"  {key:20} ({type_str})")


@config_cmd.command("paths")
def list_paths():
    """List all configured paths."""
    paths = config.get_all_paths()
    max_len = max(len(name) for name in paths.keys())
    for name, path in sorted(paths.items()):
        exists = "✓" if path.exists() else "✗"
        click.echo(f"{name:{max_len}}  [{exists}]  {path}")


@config_cmd.command("edit")
def edit():
    """Open configuration file in editor."""
    config.edit()


@config_cmd.command("where")
def where():
    """Show configuration file location."""
    click.echo(config._config_path)


@config_cmd.command("init")
def init_config():
    """Create initial config from example template."""
    config_path = config._config_path
    example_path = config_path.parent / "config.json.example"

    if config_path.exists():
        click.echo(f"Config already exists: {config_path}", err=True)
        click.echo("Use 'mycli config edit' to modify it")
        raise click.Exit(1)

    if not example_path.exists():
        click.echo(f"Example config not found: {example_path}", err=True)
        raise click.Exit(1)

    import shutil
    shutil.copy(example_path, config_path)
    click.secho(f"Created config from template: {config_path}", fg="green")
    click.echo("Edit it to add your API keys and customize paths")