use clap::Parser;
use std::path::PathBuf;

/// Enter chroot environments with Linux namespaces
#[derive(Parser, Debug, Clone)]
#[command(author, version, about, long_about = None, override_usage = "ecr [OPTIONS] <DISTRO[:VERSION]> -- [COMMAND]...")]
pub struct Args {
    /// Distribution name (e.g., ubuntu, debian, arch, alpine, fedora)
    #[arg(value_name = "DISTRO[:VERSION]")]
    pub distro: String,

    /// Target architecture
    #[arg(short, long, value_name = "ARCH")]
    pub arch: Option<String>,

    /// Directory to overlay-mount (can be specified multiple times, default: current directory)
    #[arg(long, value_name = "PATH")]
    pub bind: Vec<PathBuf>,

    /// Directory to bind-mount read-write at /mnt/<basename> (overrides regular bind, can be specified multiple times)
    #[arg(long, value_name = "PATH")]
    pub bind_rw: Vec<PathBuf>,

    /// Download fresh tarball, ignore cache
    #[arg(long)]
    pub no_cache: bool,

    /// Skip mounting any directory
    #[arg(long)]
    pub no_bind: bool,

    /// Print diagnostic messages (URLs, manifest info, extraction steps, etc.)
    #[arg(short = 'v', long)]
    pub verbose: bool,

    /// Boot with QEMU system emulation (optionally specify kernel path, or omit to download default)
    ///
    /// Examples:
    ///   --kernel           Download and use the default Alpine linux-virt kernel
    ///   --kernel ./vmlinuz Use a specific kernel file
    #[arg(long, value_name = "KERNEL_PATH", num_args = 0..=1)]
    pub kernel: Option<Option<PathBuf>>,

    /// Memory size for QEMU VM (only used with --kernel, e.g., 512M, 2G)
    #[arg(short = 'm', long, default_value = "2G", value_name = "SIZE")]
    pub memory: String,

    /// Command to run inside the chroot (default: interactive shell)
    #[arg(
        trailing_var_arg = true,
        allow_hyphen_values = true,
        value_name = "COMMAND"
    )]
    pub command: Vec<String>,
}