use crate::arch;
use crate::log_level::LogLevel;
use crate::path_ext::PathExt;
use dirs::home_dir;
use structopt::StructOpt;

#[derive(StructOpt, Debug)]
pub struct FnmConfig {
    /// https://nodejs.org/dist/ mirror
    #[structopt(
        long,
        env = "FNM_NODE_DIST_MIRROR",
        default_value = "https://nodejs.org/dist",
        global = true
    )]
    pub node_dist_mirror: reqwest::Url,

    /// The root directory of fnm installations.
    #[structopt(long = "fnm-dir", env = "FNM_DIR", global = true)]
    pub base_dir: Option<std::path::PathBuf>,

    /// Where the current node version link is stored.
    /// This value will be populated automatically by evaluating
    /// `fnm env` in your shell profile. Read more about it using `fnm help env`
    #[structopt(
        long,
        env = "FNM_MULTISHELL_PATH",
        hide_env_values = true,
        hidden = true
    )]
    multishell_path: Option<std::path::PathBuf>,

    /// The log level of fnm commands
    #[structopt(long, env = "FNM_LOGLEVEL", default_value = "info", global = true)]
    log_level: LogLevel,

    /// Override the architecture of the installed Node binary.
    /// Defaults to arch of fnm binary.
    #[structopt(long, env = "FNM_ARCH", default_value, global = true)]
    pub arch: arch::Arch,
}

impl Default for FnmConfig {
    fn default() -> Self {
        Self {
            node_dist_mirror: reqwest::Url::parse("https://nodejs.org/dist/").unwrap(),
            base_dir: None,
            multishell_path: None,
            log_level: LogLevel::Info,
            arch: Default::default(),
        }
    }
}

impl FnmConfig {
    pub fn multishell_path(&self) -> Option<&std::path::Path> {
        match &self.multishell_path {
            None => None,
            Some(v) => Some(v.as_path()),
        }
    }

    pub fn log_level(&self) -> &LogLevel {
        &self.log_level
    }

    pub fn base_dir_with_default(&self) -> std::path::PathBuf {
        self.base_dir
            .clone()
            .unwrap_or_else(|| home_dir().expect("Can't get home directory").join(".fnm"))
            .ensure_exists_silently()
    }

    pub fn installations_dir(&self) -> std::path::PathBuf {
        self.base_dir_with_default()
            .join("node-versions")
            .ensure_exists_silently()
    }

    pub fn default_version_dir(&self) -> std::path::PathBuf {
        self.aliases_dir().join("default")
    }

    pub fn aliases_dir(&self) -> std::path::PathBuf {
        self.base_dir_with_default()
            .join("aliases")
            .ensure_exists_silently()
    }

    #[cfg(test)]
    pub fn with_base_dir(mut self, base_dir: Option<std::path::PathBuf>) -> Self {
        self.base_dir = base_dir;
        self
    }

    pub fn multishell_base_dir(&self) -> std::path::PathBuf {
        std::env::temp_dir()
            .join("fnm_multishell")
            .ensure_exists_silently()
    }
}