//go:build midnight
package moonlight

import (
	"github.com/aarzilli/golua/lua"
)

type Runtime struct{
	state *lua.State
}

func NewRuntime() *Runtime {
	L := lua.NewState()
	L.OpenLibs()

	return &Runtime{
		state: L,
	}
}

func (mlr *Runtime) PushNext1(c *GoCont, v Value) Cont {
	c.vals = []Value{v}

	return c
}

func (mlr *Runtime) Call1(f Value, args ...Value) (Value, error) {
	for _, arg := range args {
		mlr.pushToState(arg)
	}

	if f.refIdx > 0 {
		mlr.state.RawGeti(lua.LUA_REGISTRYINDEX, f.refIdx)
		mlr.state.Call(len(args), 1)
	}

	if mlr.state.GetTop() == 0 {
		return NilValue, nil
	}

	return NilValue, nil
}

func (mlr *Runtime) pushToState(v Value) {
	switch v.Type() {
		case NilType: mlr.state.PushNil()
		case StringType: mlr.state.PushString(v.AsString())
		case TableType:
			tbl := v.AsTable()
			tbl.SetRuntime(mlr)
			tbl.Push()
		default: mlr.state.PushNil()
	}
}