package vm

import (
	"jinx/pkg/lang/vm/mem"
	"jinx/pkg/lang/vm/stack"
	"jinx/pkg/lang/vm/value"
)

func (vm *VM) Mem() mem.Mem {
	return vm.memory
}

func (vm *VM) Stack() stack.Stack {
	return vm.stack
}

func (vm *VM) GetThis() (value.Value, error) {
	err := vm.execGetEnv(0)
	if err != nil {
		return value.Value{}, err
	}

	// Take it back!
	this, err := vm.popAndDrop()
	if err != nil {
		return value.Value{}, err
	}

	return this, nil
}

func (vm *VM) AddGlobal(name string, v value.Value) error {
	globalPtr, err := vm.memory.Allocate(mem.CellKindGlobal)
	if err != nil {
		return err
	}

	globalCell := value.GlobalCell(v)
	if err := vm.memory.Set(globalPtr, globalCell); err != nil {
		return err
	}

	vm.globals[name] = globalPtr

	return nil
}

func (vm *VM) GetGlobal(name string) (value.Value, bool, error) {
	ptr, ok := vm.globals[name]
	if !ok {
		return value.Value{}, false, nil
	}

	cell, err := vm.getMemCell(ptr, mem.CellKindGlobal, false)
	if err != nil {
		return value.Value{}, false, err
	}

	v := cell.(value.GlobalCell).Get()

	return v, true, nil
}