#![allow(dead_code)]
#![warn(
    clippy::wildcard_imports,
    clippy::string_add,
    clippy::string_add_assign,
    clippy::manual_ok_or,
    unused_lifetimes
)]

pub enum Error {
    UnknownOpcode(u8),
    InvalidArguments,
    Eof,
}

macro_rules! opcodes {
    ( $( $code:literal $name:ident $docs:literal ),* ) => {
        #[repr(u8)]
        #[derive(Clone, Copy, Eq, PartialEq)]
        pub enum Opcode {
            $(
                #[doc = $docs]
                $name = $code
            ),*
        }

        impl Opcode {
            pub fn into_u8(self) -> u8 {
                self as u8
            }

            pub fn from_u8(value: u8) -> Opcode {
                match value {
                    $( $code => Self:: $name , )*
                    _ => panic!("Invalid opcode"),
                }
            }
        }
    };
}

opcodes! {
    0x00 Constant   "Push a constant value onto the stack",
    0x01 Load       "Load a value from a variable",
    0x02 Push       "Push a value to a variable",

    0x10 Dup        "Duplicate a value on the stack",
    0x11 Del        "Delete a value from the stack",

    0x20 Add        "Add the last 2 values on the stack",
    0x21 Sub        "Subtract the last 2 values on the stack",
    0x22 Mul        "Multiply the last 2 values on the stack",
    0x23 Div        "Divide the last 2 values on the stack",
    0x24 Mod        "Modulo the last 2 values on the stack",

    0x30 Eq         "Check if the last 2 values on the stack are equal",
    0x31 Ne         "Check if the last 2 values on the stack are not equal",

    0x40 Jmp        "Jump to a specific point in the program",
    0x41 JmpIf      "Jump to a specific point in the program if true is on the stack",

    0x50 Call       "Call function on stack",
    0x51 Return     "Return from function on stack",

    0xE0 Hlt        "Halt the program",
    0xE1 Exit       "Exit the program",

    0xF0 VMReturn   "[DEBUG] Pop value from stack and return it fromthe program",
    0xF1 VMPrint    "[DEBUG] Print value to console"
}