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use crate::errors::*;
use serde::{Deserialize, Serialize};
use std::path::{Path, PathBuf};

#[derive(Serialize, Deserialize, Clone, Debug, Hash, PartialEq, Eq, PartialOrd, Ord)]
/// Metadata about the environment

pub struct Env {
    /// The username

    pub username: String,
    /// The hostname,

    pub hostname: String,
    /// The distro

    pub distro: String,
    /// The real name for the user

    pub realname: String,
    /// The device name

    pub devicename: String,
}

impl Env {
    /// uses the PATH environment variable to search

    /// for a filename matching the specified name.

    /// if a matching filename is not found, it

    /// will check for the existence of name.exe

    /// and name.bat

    ///

    /// Example

    ///

    /// ```

    /// use reef::Env;

    /// let git_path = Env::which("git").unwrap();

    /// assert!(git_path.exists());

    /// ```

    pub fn which(name: &str) -> Result<PathBuf> {
        super::path::which(name)
    }

    /// extracts the text following the shebang #!

    ///

    /// Example

    ///

    /// given a file

    /// with the contents:

    ///

    /// #!C:/Ruby26-x64/bin/ruby.exe

    ///

    /// the shebang method will return C:/Ruby26-x64/bin/ruby.exe

    ///

    /// ```

    /// use reef::Env;

    /// use std::env;

    /// let path = std::env::temp_dir().join("test.rb");

    /// std::fs::write(&path,b"#!C:/Ruby26-x64/bin/ruby.exe")?;

    /// let target = Env::shebang(&path).unwrap();

    /// assert_eq!("C:/Ruby26-x64/bin/ruby.exe",target);

    /// # Ok::<(), std::io::Error>(())

    /// ```

    pub fn shebang(path: &Path) -> Result<String> {
        super::path::shebang(path)
    }
}

impl Default for Env {
    fn default() -> Self {
        Env {
            username: whoami::username(),
            hostname: whoami::hostname(),
            distro: whoami::distro(),
            realname: whoami::realname(),
            devicename: whoami::devicename(),
        }
    }
}