use std::str::FromStr;

use crate::{Directory, State};

static PROJECTS_DIR: &'static str = "stuff";
static HOME_DIR: &'static str = "projects";

pub fn handle_command(command_string : String, state : &mut State)  {
  let mut words = command_string.split(' ');

  let command = words.next().unwrap();
  let args = words.collect::<Vec<&str>>();

  match command {
    "clear" => {
      state.output.clear();
    }

    "cd" => {
      if args.len() == 0 {
        state.current_working_directory = Directory::Home;
      } else {
        match state.current_working_directory {
          Directory::Home => {
            match args[0] {
              "~" => (),
              "~/" => (),
              ".." => state.output.push_back(String::from_str("bash: cd: ..: Permission denied").unwrap()),
              "../" => state.output.push_back(String::from_str("bash: cd: ..: Permission denied").unwrap()),
              "projects" => state.current_working_directory = Directory::Projects,
              "projects/" => state.current_working_directory = Directory::Projects,
              _ => {
                if args[0].chars().next().unwrap() == '/' {
                  state.output.push_back(format!("bash: cd: {}: Permission denied", args[0]));
                } else {
                  state.output.push_back(format!("bash: cd: {}: No such file or directory", args[0]));
                }
              }
            }
          },
          Directory::Projects => {
            match args[0] {
              "~" => state.current_working_directory = Directory::Home,
              "~/" => state.current_working_directory = Directory::Home,
              ".." => state.current_working_directory = Directory::Home,
              "../" => state.current_working_directory = Directory::Home,
              _ => {
                if args[0].chars().next().unwrap() == '/' {
                  state.output.push_back(format!("bash: cd: {}: Permission denied", args[0]));
                } else {
                  state.output.push_back(format!("bash: cd: {}: No such file or directory", args[0]));
                }
              }
            }

          }
        }
      }
    }

    "ls" => match state.current_working_directory {
      Directory::Home => match args.len() {
        0 => state.output.push_back(String::from_str(HOME_DIR).unwrap()),
        1 => match args[0] {
          "projects" => state.output.push_back(String::from_str(PROJECTS_DIR).unwrap()),
          "projects/" => state.output.push_back(String::from_str(PROJECTS_DIR).unwrap()),
          _ => state.output.push_back(format!("bash: ls: '{}': No such file or directory", args[0]))
        },
        _ => state.output.push_back(format!("bash: ls: too many arguments"))
      },
      Directory::Projects => match args.len() {
        0 => state.output.push_back(String::from_str(PROJECTS_DIR).unwrap()),
        1 => match args[0] {
          ".." => state.output.push_back(String::from_str(HOME_DIR).unwrap()),
          "../" => state.output.push_back(String::from_str(HOME_DIR).unwrap()),
          _ => state.output.push_back(format!("bash: ls: '{}': No such file or directory", args[0]))
        },
        _ => state.output.push_back(format!("bash: ls: too many arguments"))
      }
    }
    
    _ => {
      state.output.push_back(format!("bash: {}: command not found", command));
    }
  }
}