use std::path::PathBuf;

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

#[derive(Debug, Clone, Default, Parser)]
#[command(author, version, about)]
pub struct Config {
    #[command(flatten)]
    pub search: Search,

    #[command(flatten)]
    pub parsers: Projects,

    /// Add arbitrary directories
    ///
    /// Directories added by this flag are still filtered and sorted based on supplied options.
    #[arg(short = 'P', long = "project")]
    pub projects: Vec<PathBuf>,

    /// Add any current tmux session's paths to output.
    ///
    /// Uses the tmux session's `session_path`.
    #[arg(short = 'T', long = "sessions")]
    pub tmux_sessions: bool,

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

#[derive(Debug, Default, Clone, Args)]
pub struct Search {
    /// Directories to search.
    ///
    /// Directories are searched recursively based on `--max-depth`.
    pub paths: Vec<PathBuf>,

    /// Recurse into hidden directories.
    ///
    /// Traverse into hidden directories while searching. A directory is considered hidden
    /// if its name starts with a `.` sign (dot). If `--max-depth` is 0, this has no effect.
    #[arg(long)]
    pub hidden: bool,

    /// Max depth to recurse.
    ///
    /// MAX_DEPTH of 0 will only return the supplied PATHS.
    #[arg(short = 'd', long, default_value = "1")]
    pub max_depth: Option<usize>,
}

#[derive(Debug, Default, Clone, Args)]
pub struct Projects {
    /// Match all child directories.
    ///
    /// Uses the directory mtime as the timestamp.
    #[arg(short, long)]
    pub mtime: bool,

    /// Match directories containing <PATTERN>.
    ///
    /// Uses the directory mtime as the timestamp. PATTERN should be a path relative to the
    /// searched directory.
    #[arg(long, short)]
    pub pattern: Option<String>,

    /// Match git repositories.
    ///
    /// Uses the most recient commit as the timestamp.
    #[cfg(feature = "git")]
    #[arg(long, short)]
    pub git: bool,

    /// Use existing tmux sessions for project timestamps
    ///
    /// Note: This only used for sorting projects using `session_last_attached` (or
    /// `session_created` if not yet attached). For adding existing tmux session's paths to the
    /// ouput, see `-T|--sessions`.
    #[arg(long, short)]
    pub tmux: bool,
}

#[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()
    }
}