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use std::{env, path::PathBuf};

use clap::{
    crate_authors, crate_name, crate_version, value_parser, ArgAction, Parser, Subcommand,
    ValueEnum,
};
use fluent_templates::Loader;

use crate::{
    cmd::{
        bookshelf::Bookshelf, build::Build, check::Check, completions::Completions,
        download::Download, info::Info, read::Read, real_cugan::RealCugan, search::Search,
        transform::Transform, unzip::Unzip, update::Update, zip::Zip,
    },
    LANG_ID, LOCALES,
};

#[must_use]
#[derive(Parser)]
#[command(author, version = version_msg(), about = about_msg(), long_about = None, propagate_version = true)]
pub struct Config {
    #[command(subcommand)]
    pub command: Commands,

    #[arg(long, value_enum, global = true,
        help = LOCALES.lookup(&LANG_ID, "backtrace").unwrap())]
    pub backtrace: Option<Backtrace>,

    #[arg(short, long, action = ArgAction::Count, global = true, default_value_t = 0,
        value_parser = value_parser!(u8).range(0..=4),
        help = LOCALES.lookup(&LANG_ID, "verbose").unwrap())]
    pub verbose: u8,

    #[arg(short, long, global = true, conflicts_with = "verbose", default_value_t = false,
        help = LOCALES.lookup(&LANG_ID, "quiet").unwrap())]
    pub quiet: bool,
}

#[must_use]
#[derive(Subcommand)]
pub enum Commands {
    Download(Download),
    Search(Search),
    Info(Info),
    Read(Read),
    Bookshelf(Bookshelf),
    Transform(Transform),
    Check(Check),
    Build(Build),
    Zip(Zip),
    Unzip(Unzip),
    RealCugan(RealCugan),
    Update(Update),
    Completions(Completions),
}

#[must_use]
#[derive(Clone, PartialEq, ValueEnum)]
pub enum Backtrace {
    ON,
    FULL,
}

#[must_use]
const fn about_msg() -> &'static str {
    concat!(
        crate_name!(),
        " ",
        crate_version!(),
        "\nAuthor: ",
        crate_authors!(),
        "\nProject home page: ",
        env!("CARGO_PKG_HOMEPAGE"),
    )
}

#[must_use]
fn version_msg() -> String {
    let info = os_info::get();

    format!(
        "{}\nExecutable path: {}\nConfig directory: {}\nData directory: {}\nOS information: {info}\nArchitecture: {}",
        crate_version!(),
        env::current_exe()
            .unwrap_or_else(|_| {
                eprintln!("Unable to get current executable path");
                PathBuf::from(crate_name!())
            })
            .display(),
        novel_api::config_dir_path("some-source").unwrap().display(),
        novel_api::data_dir_path("some-source").unwrap().display(),
        info.architecture().unwrap_or("unknown")
    )
}

#[cfg(test)]
mod tests {
    use clap::CommandFactory;

    use super::*;

    #[test]
    fn verify_cli() {
        Config::command().debug_assert()
    }
}