use crate::builtins::{Builtin, BuiltinConfig};
use crate::error::ShellError;
use colored::Colorize;

pub struct Help;

impl Builtin for Help {
    fn execute(&mut self, _: &mut BuiltinConfig, _: Vec<String>) -> Result<(), ShellError> {
        let commands = "blahaj          prints blahaj, styles: p, t
            cd              changes current working directory
            change-prompt   changes prompt style (default, bashlike, simpledirectory)
            exit            exits the shell
            fetch           prints out system information
            help            displays this command
            logout          current user gets logged out
            ls              lists contents of directory
            open            shows content of files
            pwd             shows path to current working directory
            quote           prints a random quote
            segfault        exits, but the elegant way
            sus             shows amogus
            ";

        for line in commands.lines() {
            println!(
                "{}{}",
                split_command(line)[0].bold(),
                split_command(line)[1]
            );
        }
        Ok(())
    }
}

fn split_command(commands: &str) -> Vec<&str> {
    if !commands.trim_start().is_empty() {
        let splitted_command = commands.trim_start().splitn(2, ' ').collect();
        return splitted_command;
    }
    vec!["", ""]
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_split_command_split() {
        let test_string1 = "Hallo, Marcel Davis 1&1.";
        assert_eq!(
            split_command(test_string1),
            vec!["Hallo,", "Marcel Davis 1&1."]
        );

        let test_string2 = "Leiter1 23für Kundenzufriedenheit.";
        assert_eq!(
            split_command(test_string2),
            vec!["Leiter1", "23für Kundenzufriedenheit."]
        );

        let test_string3 = "Wir# $%gehen erst wieder, wenn ihre Leitung läuft!";
        assert_eq!(
            split_command(test_string3),
            vec!["Wir#", "$%gehen erst wieder, wenn ihre Leitung läuft!"]
        );
    }

    #[test]
    fn test_split_command_empty() {
        assert_eq!(split_command(""), vec!["", ""]);
    }

    #[test]
    fn test_split_command_only_space() {
        assert_eq!(split_command("               "), vec!["", ""]);
    }
}