/******************************************************************************
 * This program demonstrates the Stack ADT
 * 
 * Copyright © 2021 Richard Lesh.  All rights reserved.
 *****************************************************************************/

mod utils;
use std::env;
use std::error;
use std::sync::Arc;

struct IntegerStack {
// Internal representation for the stack is a list
	let mut stack:Vec<isize> = Vec::new();

}
impl IntegerStack {
	fn new() -> IntegerStack {
		self.stack = Vec::new();
	}
	fn pop() -> Result<isize, Arc<dyn error::Error>> {
		if self.stack.len() == 0 {
			return Err(Arc::new(utils::CustomError::RuntimeError("Can't pop on empty stack!".to_string())));
		}
		return self.stack.pop().unwrap();
	}
	fn push(value:isize) -> () {
		self.stack.push(value);
	}
	fn peek() -> Result<isize, Arc<dyn error::Error>> {
		if self.stack.len() == 0 {
			return Err(Arc::new(utils::CustomError::RuntimeError("Can't peek on empty stack!".to_string())));
		}
		return self.stack[self.stack.len() - 1];
	}
}

fn main() {
	let args: Vec<String> = env::args().collect();
	let mut stack:IntegerStack = IntegerStack::new();
	{
		let mut x:isize = 1;
		while x <= 10 {
			stack.push(x);
			x += 1;
		}
	}
	match (|| -> Result<(), Arc<dyn error::Error>>{
		println!("{}", stack.peek());
		{
			let mut x_:isize = 1;
			while x_ <= 11 {
				println!("{}", stack.pop());
				x_ += 1;
			}
		}
		return Ok(());
	})() {
		Ok(()) => {},
		Err(ex) => {
			if let Some(ex) = utils::isCustomErrorType(ex.clone(), utils::CustomError::RuntimeError("".to_string())){
				println!("{}", format!("{}", ex));
			}
		}
	};
}