use clap::{Args, Parser};
use std::path::PathBuf;
use tracing_subscriber::{filter::LevelFilter, Layer, Registry};

use crate::paths::PathEntry;

/// Simple program to manage projects and ssh hosts using tmux
#[derive(Parser, Debug)]
#[command(author, version, about)]
pub struct Cli {
    /// Path to directories
    pub(crate) path: Vec<PathBuf>,

    /// Max depth to recurse.
    ///
    /// By default, no limit is set. Setting to 0 will only use the supplied directory.
    #[arg(short = 'd', long)]
    pub(crate) max_depth: Option<usize>,

    /// Recurse into hidden directories.
    ///
    /// Include hidden directories when traversing directories. (default: hidden directories
    /// are skipped). A Directory is considered to be hidden if its name starts with a `.`
    /// sign (dot). If `max-depth` is set to 0, this has no effect (As no recursion happens).
    #[arg(long)]
    pub(crate) hidden: bool,

    #[command(flatten)]
    pub verbose: Verbosity,

    /// Connect to ssh host
    #[arg(short, long)]
    pub ssh: Option<String>,
}

impl Cli {
    pub fn as_layer(&self) -> Vec<Box<dyn Layer<Registry> + Send + Sync>> {
        let fmt_layer = tracing_subscriber::fmt::layer()
            .pretty()
            .with_filter(self.verbose.as_filter())
            .boxed();

        vec![fmt_layer]
    }

    // TODO: replace this with `impl Figment for Cli`
    pub fn as_config(&self) -> crate::paths::Config {
        crate::paths::Config {
            paths: self
                .path
                .to_owned()
                .into_iter()
                .map(|p| PathEntry {
                    path: p,
                    hidden: self.hidden,
                    recurse: self.max_depth,
                })
                .collect(),
        }
    }
}

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

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

impl Verbosity {
    pub fn as_filter(&self) -> LevelFilter {
        self.into()
    }
}

impl From<&Verbosity> for LevelFilter {
    fn from(value: &Verbosity) -> Self {
        match value.verbose + 1 - u8::from(value.quiet) {
            0 => LevelFilter::OFF,
            1 => LevelFilter::ERROR,
            2 => LevelFilter::WARN,
            3 => LevelFilter::INFO,
            4 => LevelFilter::DEBUG,
            _ => LevelFilter::TRACE,
        }
    }
}

#[cfg(test)]
mod tests {
    #[test]
    fn test_start() {
        assert_eq!(1, 1);
    }
}