package flowdef

import (
	"encoding/json"
	"strings"
	"testing"
)

const testVideoID = "5fbec3b1-1b0f-417d-9059-8b94a47197ed"

func TestNewV210Video(t *testing.T) {
	definition, err := NewV210Video(testVideoID, 1920, 1080, Rational{Numerator: 30000, Denominator: 1001})
	if err != nil {
		t.Fatalf("NewV210Video: %v", err)
	}
	if definition.ID != testVideoID {
		t.Fatalf("ID = %q, want %q", definition.ID, testVideoID)
	}
	if definition.Format != FormatVideo || definition.MediaType != MediaTypeV210 {
		t.Fatalf("format/media type = %q/%q", definition.Format, definition.MediaType)
	}
	if len(definition.Components) != 3 {
		t.Fatalf("component count = %d, want 3", len(definition.Components))
	}
	if definition.Parents == nil {
		t.Fatal("Parents is nil; want an empty JSON array")
	}
}

func TestNewV210VideoRejectsInvalidWidth(t *testing.T) {
	_, err := NewV210Video(testVideoID, 1919, 1080, Rational{Numerator: 25, Denominator: 1})
	if err == nil || !strings.Contains(err.Error(), "divisible by 6") {
		t.Fatalf("error = %v, want width divisibility error", err)
	}
}

func TestParseV210Video(t *testing.T) {
	want, err := NewV210Video(testVideoID, 1920, 1080, Rational{Numerator: 25, Denominator: 1})
	if err != nil {
		t.Fatalf("NewV210Video: %v", err)
	}
	data, err := json.Marshal(want)
	if err != nil {
		t.Fatalf("json.Marshal: %v", err)
	}

	got, err := ParseV210Video(data)
	if err != nil {
		t.Fatalf("ParseV210Video: %v", err)
	}
	if got.ID != want.ID || got.FrameWidth != want.FrameWidth || got.GrainRate != want.GrainRate {
		t.Fatalf("parsed definition = %+v, want %+v", got, want)
	}
}

func TestParseV210VideoRejectsAudio(t *testing.T) {
	data := []byte(`{
		"id":"5fbec3b1-1b0f-417d-9059-8b94a47197ed",
		"format":"urn:x-nmos:format:audio",
		"media_type":"audio/float32"
	}`)

	_, err := ParseV210Video(data)
	if err == nil || !strings.Contains(err.Error(), "format must be") {
		t.Fatalf("error = %v, want video format error", err)
	}
}