use clap::{Args, Parser};
use figment::{providers::Serialized, value, Metadata, Profile, Provider};
use serde::Serialize;
use std::path::PathBuf;
use tracing_subscriber::{filter::LevelFilter, Layer, Registry};

use crate::{paths::PathEntry, Config};

/// Simple program to manage projects and ssh hosts using tmux
#[derive(Debug, Clone, Default, Parser, Serialize)]
#[command(author, version, about)]
#[serde(into = "Config")]
pub struct Cli {
    /// Path to directories
    pub(crate) paths: 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]
    }
}

impl From<Cli> for Config {
    fn from(value: Cli) -> Self {
        Config {
            paths: crate::paths::Config {
                paths: value
                    .paths
                    .iter()
                    .cloned()
                    .map(|p| PathEntry {
                        path: p,
                        hidden: value.hidden,
                        recurse: value.max_depth,
                    })
                    .collect(),
            },
            ..Default::default()
        }
    }
}

impl Provider for Cli {
    fn metadata(&self) -> Metadata {
        Metadata::named("Tmuxr cli provider")
    }

    fn data(&self) -> figment::error::Result<value::Map<Profile, value::Dict>> {
        Serialized::defaults(Self::default()).data()
    }
}

#[derive(Debug, Default, Clone, 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_cli_parse() {
        assert_eq!(1, 1);
    }
}