// SPDX-License-Identifier: MIT

package template

import (
	"encoding/json"
	"fmt"
	"math"
	"os"
	"testing"
)

// TestPlainScalarsAgainstReference compares how plain scalars are typed with
// the JavaScript yaml library the reference uses. testdata/scalars.json is
// generated by gen/scalars.mjs.
func TestPlainScalarsAgainstReference(t *testing.T) {
	data, err := os.ReadFile("testdata/scalars.json")
	if err != nil {
		t.Fatal(err)
	}
	var want map[string]string
	if err := json.Unmarshal(data, &want); err != nil {
		t.Fatal(err)
	}
	for src, w := range want {
		res := readYAMLDocument("f.yml", []byte("k: "+src+"\n"))
		if w == "ERR" {
			continue
		}
		if len(res.errs) > 0 {
			t.Errorf("%q: error %v, reference %s", src, res.errs[0], w)
			continue
		}
		var got string
		switch v := res.root.vals[0].lit.(type) {
		case *Null:
			got = "null"
		case *Number:
			if math.IsNaN(v.Value) {
				got = "num:NaN"
			} else {
				got = "num:" + JSNumberString(v.Value)
			}
		case *Boolean:
			got = fmt.Sprintf("bool:%v", v.Value)
		case *String:
			got = "str:" + v.Value
		}
		if got != w {
			t.Errorf("%q: got %s, reference %s", src, got, w)
		}
	}
}