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use std::fmt;
use std::fmt::Formatter;

use crate::core::llvm_string;

/// An representation of LLVMValue.
/// LLVMValue を表す構造体
#[derive(Eq, PartialEq, PartialOrd, Ord, Hash, Clone)]
pub struct LLVMValue {
    pub kind: LLVMValueKind,
}

impl LLVMValue {
    fn new(value_kind: LLVMValueKind) -> Self {
        Self { kind: value_kind }
    }

    pub fn new_register(s: llvm_string::LLVMString) -> Self {
        Self::new(LLVMValueKind::REGISTER(s))
    }

    pub fn new_integer(v: i128) -> Self {
        Self::new(LLVMValueKind::INTEGER(v))
    }

    pub fn new_unsigned_int(v: u128) -> Self {
        Self::new(LLVMValueKind::UNSIGNEDINTEGER(v))
    }
}

impl fmt::Display for LLVMValue {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        match &self.kind {
            LLVMValueKind::REGISTER(s) => write!(f, "%{}", s),
            LLVMValueKind::INTEGER(v) => write!(f, "{}", v),
            LLVMValueKind::UNSIGNEDINTEGER(v) => write!(f, "{}", v),
        }
    }
}

/// LLVMValue の種類
#[derive(Eq, PartialEq, PartialOrd, Ord, Hash, Clone)]
pub enum LLVMValueKind {
    REGISTER(llvm_string::LLVMString),
    INTEGER(i128),
    UNSIGNEDINTEGER(u128),
}