//go:build (js && wasm)
// +build js,wasm
package main

import (
	"bytes"
	"fmt"
	"syscall/js"
	"varaq/varaq"
)

func main() {
	done := make(chan struct{}, 0)
	js.Global().Set("varaq", js.FuncOf(jsInterpret))
	fmt.Println("varaq WASM init, Qa'pla!")
	<-done
}

func jsInterpret(this js.Value, args []js.Value) interface{} {
	if len(args) < 1 {
		return js.ValueOf("no input")
	}
	input := args[0].String()

	tokens, err := varaq.Tokenize(input)
	if err != nil {
		return js.ValueOf(fmt.Errorf("%v", err))
	}

	code := varaq.Parse(tokens)
	buf := bytes.NewBufferString("")

	strings := make([]string, len(args[1:]))
	for i, jsVal := range args[1:] {
		strings[i] = jsVal.String()
	}

	err = varaq.Interpret(code, strings, buf)
	if err != nil {
		return js.ValueOf(fmt.Errorf("%v", err))
	}

	return js.ValueOf(buf.String())
}