use crate::vm::constant::DvmConstant;
use crate::vm::source_code_location::SourceCodeLocation;
use std::rc::Rc;

#[derive(Debug, Clone)]
pub enum Instruction {
    MoveImmediate {
        destination_register: usize,
        immediate: Immediate,
    },
    Copy {
        source: Location,
        destination: Location,
    },
    Push {
        source_register: usize,
    },
    Pop {
        destination_register: Option<usize>,
    },
    AllocateObject {
        implementation_name: Rc<String>,
        destination_register: usize,
    },
    InvokeStatic {
        function_name: Rc<String>,
        source_code_location: SourceCodeLocation,
    },
    InvokeObject {
        object_register: usize,
        function_name: Rc<String>,
        source_code_location: SourceCodeLocation,
    },
    InvokeStaticPlatform {
        function_name: Rc<String>,
        source_code_location: SourceCodeLocation,
    },
    InvokeObjectPlatform {
        object_register: usize,
        function_name: Rc<String>,
        source_code_location: SourceCodeLocation,
    },
    SetReturnValue {
        source_register: usize,
    },
    TakeReturnValue {
        destination_register: usize,
    },
    Add {
        left: u8,
        right: u8,
        destination: u8,
    },
    Subtract {
        left: u8,
        right: u8,
        destination: u8,
    },
    Multiply {
        left: u8,
        right: u8,
        destination: u8,
    },
    Divide {
        left: u8,
        right: u8,
        destination: u8,
    },
    Modulo {
        left: u8,
        right: u8,
        destination: u8,
    },
    Power {
        left: u8,
        right: u8,
        destination: u8,
    },
    Jump {
        offset: isize,
    },
    JumpEqual {
        left_register: usize,
        right_register: usize,
        offset: isize,
    },
    JumpNotEqual {
        left_register: usize,
        right_register: usize,
        offset: isize,
    },
    JumpLessThan {
        left_register: usize,
        right_register: usize,
        offset: isize,
    },
    JumpGreaterThan {
        left_register: usize,
        right_register: usize,
        offset: isize,
    },
    JumpLessThanEqual {
        left_register: usize,
        right_register: usize,
        offset: isize,
    },
    JumpGreaterThanEqual {
        left_register: usize,
        right_register: usize,
        offset: isize,
    },
    Return,
    DumpState {
        message: String,
    },
}

#[derive(Debug, Clone)]
pub enum Immediate {
    Byte(u8),
    Int(i32),
    Long(i64),
    Double(f64),
    Usize(usize),
    Boolean(bool),
    Constant(DvmConstant),
    Empty,
}

#[derive(Debug, Clone)]
pub enum Location {
    Register(usize),
    StackFrameBase {
        offset: isize,
    },
    StackTop {
        offset: isize,
    },
    Field {
        object_register: usize,
        field_name: Rc<String>,
    },
    Array {
        array_register: usize,
        index_register: usize,
        offset: isize,
    },
}