use status::StatusFlags;

use crate::asm::data::literal::{Addr, Value};

pub(crate) mod status;

pub const REG_COUNT: usize = 8;

pub type CallStack = Vec<StackFrame>;

#[derive(Default, Clone, Debug)]
pub struct StackFrame {
    /// Program counter, address of the executed instruction
    pub pc: Addr,
    /// Status flags
    pub status: StatusFlags,
    /// Argument registers
    pub arg: [Value; REG_COUNT],
    /// Result registers
    pub res: [Value; REG_COUNT],
    /// General purpose registers
    pub gen: [Value; REG_COUNT],
}

impl StackFrame {
    /// Create a new stack frame at a given address
    pub fn new(addr: Addr, args: &[Value]) -> Self {
        let mut sf = StackFrame::default();
        sf.pc = addr;
        for n in 0..(args.len().min(REG_COUNT)) {
            sf.arg[n] = args[n];
        }
        sf
    }

    pub fn set_retvals(&mut self, vals: &[Value]) {
        for n in 0..(vals.len().min(REG_COUNT)) {
            self.res[n] = vals[n];
        }
    }
}