package bytesize_test

import (
	"encoding/json"
	"math"
	"testing"

	"gitoa.ru/go-4devs/bytesize"
)

var marshalTextTests = []struct {
	in     bytesize.Size
	expect string
}{
	{bytesize.Size(0), `"0B"`},
	{bytesize.Size(100), `"100B"`},
	{bytesize.Size(1024), `"1.024kB"`},
	{bytesize.Size(1024 * 1024), `"1.048576MB"`},
	{bytesize.Size(1024 * 1024 * 1024), `"1.073741824GB"`},
	{bytesize.Size(1024 * 1024 * 1024 * 1024), `"1.099511627776TB"`},
	{bytesize.Size(math.MaxInt64), `"9223.372036854775807PB"`},
	{bytesize.Size(1000), `"1kB"`},
	{bytesize.Size(1000 * 1000), `"1MB"`},
	{bytesize.Size(1000 * 1000 * 1000), `"1GB"`},
	{bytesize.Size(1000 * 1000 * 1000 * 1000), `"1TB"`},
	{bytesize.Size(1000 * 1000 * 1000 * 1000 * 1000), `"1PB"`},
}

func TestMarshalText(t *testing.T) {
	t.Parallel()

	for _, tc := range marshalTextTests {
		data, err := json.Marshal(tc.in)
		if err != nil {
			t.Errorf("json.Marshal(%q) = _, err:%q", tc.in, err)
		} else if string(data) != tc.expect {
			t.Errorf("json.Marshal(%q) = %q, data does not equals %q", tc.in, data, tc.expect)
		}
	}
}

func TestUnmarshalText(t *testing.T) {
	t.Parallel()

	for _, tc := range marshalTextTests {
		var data bytesize.Size
		err := json.Unmarshal([]byte(tc.expect), &data)

		if err != nil {
			t.Errorf("json.Unmarshal(%q) = _, err:%q", tc.in, err)
		} else if data != tc.in {
			t.Errorf("json.Unmarshal(%q) = %q, data does not equals %q", tc.in, data, tc.expect)
		}
	}
}