use clap::{Args, Parser, Subcommand};
use clap_complete::Shell;

/// Create and manage named SSH port forwards.
#[derive(Parser)]
#[command(name = "porthole", version, about)]
pub struct Cli {
    #[command(subcommand)]
    pub command: Commands,
}

#[derive(Subcommand)]
pub enum Commands {
    /// Save a new forward profile.
    #[command(visible_alias = "create", visible_alias = "new")]
    Add(AddArgs),

    /// Start a saved forward as a supervised background process.
    #[command(visible_alias = "start")]
    Open(OpenArgs),

    /// Stop a running forward.
    #[command(visible_alias = "stop")]
    Close(CloseArgs),

    /// Update a saved profile.
    Edit(EditArgs),

    /// Show detailed status for one forward.
    Status(StatusArgs),

    /// List all saved profiles with live status.
    #[command(visible_alias = "ls")]
    List(ListArgs),

    /// Delete a saved profile.
    #[command(visible_alias = "rm", visible_alias = "delete")]
    Remove(RemoveArgs),

    /// Close and delete every forward, tracked or not.
    #[command(visible_alias = "reset")]
    Wipe(WipeArgs),

    /// Generate a shell completion script.
    Completions { shell: Shell },

    /// Internal: runs the supervisor loop for one profile. Not for direct
    /// use - `open` spawns this itself (spec §3).
    #[command(hide = true, name = "__supervise")]
    Supervise { name: String },
}

/// Shared mapping/connection flags for `add` and `edit` - kept as one
/// struct (`#[command(flatten)]`ed into both) so the two can never drift.
#[derive(Args, Default)]
pub struct MappingArgs {
    /// Local forward (current machine -> remote machine).
    #[arg(short, long, value_name = "[BIND:]PORT:HOST:PORT")]
    pub local: Option<String>,

    /// Remote forward (remote machine -> current machine).
    #[arg(short, long, value_name = "[BIND:]PORT:HOST:PORT")]
    pub remote: Option<String>,

    /// Dynamic forward (SOCKS proxy).
    #[arg(short, long, value_name = "[BIND:]PORT")]
    pub dynamic: Option<String>,

    /// Jump-host chain, ending at the connection target.
    #[arg(long, value_name = "[USER@]HOST[:PORT]", value_delimiter = ',')]
    pub via: Vec<String>,

    /// Default user for the target and any hop without one.
    #[arg(short, long, value_name = "USER")]
    pub user: Option<String>,

    /// Identity file override.
    #[arg(short, long, value_name = "PATH")]
    pub identity: Option<String>,

    /// SSH port of the final target.
    #[arg(short, long, value_name = "PORT")]
    pub port: Option<u16>,

    /// Auto-reconnect on connection drop.
    #[arg(long, num_args = 0..=1, default_missing_value = "true", value_name = "BOOL")]
    pub reconnect: Option<bool>,

    /// Base delay between reconnection attempts, in seconds.
    #[arg(long = "retry-interval", value_name = "SECONDS")]
    pub retry_interval: Option<u32>,

    /// Cap on the doubling reconnection delay, in seconds.
    #[arg(long = "backoff-max", value_name = "SECONDS")]
    pub backoff_max: Option<u32>,

    /// SSH ServerAliveInterval, in seconds.
    #[arg(long, value_name = "SECONDS")]
    pub keepalive: Option<u32>,
}

#[derive(Args)]
pub struct AddArgs {
    /// Name of the new profile.
    pub name: String,

    #[command(flatten)]
    pub mapping: MappingArgs,
}

#[derive(Args)]
pub struct EditArgs {
    /// Name of the profile to edit.
    pub name: String,

    #[command(flatten)]
    pub mapping: MappingArgs,
}

#[derive(Args)]
pub struct OpenArgs {
    /// Name of the profile to open (ignored with --all).
    pub name: Option<String>,

    /// Run attached in the current shell instead of detaching.
    #[arg(short, long)]
    pub foreground: bool,

    /// Open without auto-reconnect, regardless of the profile setting.
    #[arg(long)]
    pub once: bool,

    /// Open every profile with reconnect enabled that isn't already open.
    #[arg(long)]
    pub all: bool,
}

#[derive(Args)]
pub struct CloseArgs {
    /// Name of the profile to close.
    pub name: String,

    /// Send SIGKILL immediately instead of SIGTERM with a graceful wait.
    #[arg(long)]
    pub force: bool,
}

#[derive(Args)]
pub struct StatusArgs {
    /// Name of the profile to inspect.
    pub name: String,

    /// Machine-readable output.
    #[arg(long)]
    pub json: bool,
}

#[derive(Args)]
pub struct ListArgs {
    /// Show only currently-open forwards.
    #[arg(long)]
    pub running: bool,

    /// Machine-readable output.
    #[arg(long)]
    pub json: bool,
}

#[derive(Args)]
pub struct RemoveArgs {
    /// Name of the profile to delete.
    pub name: String,

    /// Delete the profile but leave an active instance running untracked.
    #[arg(long = "keep-running")]
    pub keep_running: bool,
}

#[derive(Args)]
pub struct WipeArgs {
    /// Skip the confirmation prompt.
    #[arg(short, long)]
    pub yes: bool,
}