use std::path::PathBuf;

use clap::{Args, Parser, Subcommand};
use tracing::{metadata::LevelFilter, Level};

#[derive(Debug, Clone, Parser)]
pub struct Config {
    #[command(subcommand)]
    pub command: Commands,

    /// tmux socket-name, equivelent to `tmux -L <socket-name>`
    #[arg(short = 'L', long, default_value = "ssh")]
    pub socket_name: String,

    /// path to history file [default: $XDG_DATA_HOME/sshr/history]
    #[arg(short = 'f', long)]
    pub history_file: Option<PathBuf>,

    #[command(flatten)]
    pub verbosity: Verbosity,
}

#[derive(Debug, Clone, Subcommand)]
pub enum Commands {
    /// List available session targets
    List,
    /// Switch to a specific session, or create it if it does not exist
    Switch {
        /// Target session name or ssh host
        name: String,
    },
}

#[derive(Debug, Default, Clone, Args)]
pub struct Verbosity {
    /// Print additional information per occurrence.
    ///
    /// Conflicts with `--quiet`.
    #[arg(short, long, global = true, action = clap::ArgAction::Count, conflicts_with = "quiet")]
    pub verbose: u8,

    /// Suppress all output.
    ///
    /// Conflicts with `--verbose`.
    #[arg(short, long, global = true, conflicts_with = "verbose")]
    pub quiet: bool,
}

impl From<&Verbosity> for Option<Level> {
    fn from(value: &Verbosity) -> Self {
        match 1 + value.verbose - u8::from(value.quiet) {
            0 => None,
            1 => Some(Level::ERROR),
            2 => Some(Level::WARN),
            3 => Some(Level::INFO),
            4 => Some(Level::DEBUG),
            _ => Some(Level::TRACE),
        }
    }
}

impl From<&Verbosity> for LevelFilter {
    fn from(value: &Verbosity) -> Self {
        Option::<Level>::from(value).into()
    }
}