use super::available_commands;
use crate::configuration::Configuration;
use std::io::Result;

pub struct Help;

impl Help {
    pub fn new() -> Self {
        Help
    }
}

impl super::Command for Help {
    fn before_dependencies(&self) -> Vec<Box<dyn super::Command>> {
        vec![]
    }

    fn execute(&self, _: Option<&String>, _: &Configuration, _: &str) -> Result<()> {
        let commands = available_commands();
        println!("Usage:");
        println!();
        for command in commands {
            print!("blog {} ", command.command());
            println!("{}", command.help());
        }
        Ok(())
    }

    fn after_dependencies(&self) -> Vec<Box<dyn super::Command>> {
        vec![]
    }

    fn command(&self) -> &'static str {
        "help"
    }

    fn help(&self) -> &'static str {
        "\t\t\t\tPrints this help"
    }
}

#[cfg(test)]
mod tests {

    use super::*;
    use crate::command::Command;
    use crate::configuration::Configuration;

    #[test]
    fn test_help_command() {
        let help = Help::new();

        let configuration = Configuration::new();
        help.execute(None, &configuration, "")
            .expect("Could not call help");
    }

    #[test]
    fn help_before_dependencies() {
        let help = Help::new();
        let dependencies = help.before_dependencies();

        assert_eq!(dependencies.len(), 0);
    }

    #[test]
    fn help_after_dependencies() {
        let help = Help::new();
        let dependencies = help.after_dependencies();

        assert_eq!(dependencies.len(), 0);
    }

    // These two tests feel pointless but I'm doing it for the coverage :p

    #[test]
    fn help_command_output() {
        let help = Help::new();
        help.command();
    }

    #[test]
    fn help_help_output() {
        let help = Help::new();
        help.help();
    }
}