use ansi_term::{Color, Style};
use std::io;

use crate::common;
use crate::common::TestCommand;

#[test]
fn ssh_only_false() -> io::Result<()> {
    let hostname = match get_hostname() {
        Some(h) => h,
        None => return hostname_not_tested(),
    };
    let output = common::render_module("hostname")
        .env_clear()
        .use_config(toml::toml! {
            [hostname]
            ssh_only = false
            trim_at = ""
        })
        .output()?;
    let actual = String::from_utf8(output.stdout).unwrap();
    let expected = format!("on {} ", style().paint(hostname));
    assert_eq!(expected, actual);
    Ok(())
}

#[test]
fn no_ssh() -> io::Result<()> {
    let output = common::render_module("hostname")
        .env_clear()
        .use_config(toml::toml! {
            [hostname]
            ssh_only = true
        })
        .output()?;
    let actual = String::from_utf8(output.stdout).unwrap();
    assert_eq!("", actual);
    Ok(())
}

#[test]
fn ssh() -> io::Result<()> {
    let hostname = match get_hostname() {
        Some(h) => h,
        None => return hostname_not_tested(),
    };
    let output = common::render_module("hostname")
        .env_clear()
        .use_config(toml::toml! {
            [hostname]
            ssh_only = true
            trim_at = ""
        })
        .env("SSH_CONNECTION", "something")
        .output()?;
    let actual = String::from_utf8(output.stdout).unwrap();
    let expected = format!("on {} ", style().paint(hostname));
    assert_eq!(expected, actual);
    Ok(())
}

#[test]
fn no_trim_at() -> io::Result<()> {
    let hostname = match get_hostname() {
        Some(h) => h,
        None => return hostname_not_tested(),
    };
    let output = common::render_module("hostname")
        .env_clear()
        .use_config(toml::toml! {
            [hostname]
            ssh_only = false
            trim_at = ""
        })
        .output()?;
    let actual = String::from_utf8(output.stdout).unwrap();
    let expected = format!("on {} ", style().paint(hostname));
    assert_eq!(expected, actual);
    Ok(())
}

#[test]
fn trim_at() -> io::Result<()> {
    let hostname = match get_hostname() {
        Some(h) => h,
        None => return hostname_not_tested(),
    };
    let (remainder, trim_at) = hostname.split_at(1);
    let output = common::render_module("hostname")
        .env_clear()
        .use_config(toml::toml! {
            [hostname]
            ssh_only = false
            trim_at = trim_at
        })
        .output()?;
    let actual = String::from_utf8(output.stdout).unwrap();
    let expected = format!("on {} ", style().paint(remainder));
    assert_eq!(expected, actual);
    Ok(())
}

fn get_hostname() -> Option<String> {
    match gethostname::gethostname().into_string() {
        Ok(hostname) => Some(hostname),
        Err(_) => None,
    }
}

fn style() -> Style {
    Color::Green.bold().dimmed()
}

fn hostname_not_tested() -> io::Result<()> {
    println!(
        "hostname was not tested because gethostname failed! \
         This could be caused by your hostname containing invalid UTF."
    );
    Ok(())
}