package chromedp

import (
	"bytes"
	"image"
	_ "image/png"
	"strings"
	"testing"
	"time"

	"github.com/chromedp/cdproto/emulation"
	"github.com/chromedp/cdproto/page"
)

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

	ctx, cancel := testAllocate(t, "image.html")
	defer cancel()

	if err := Run(ctx, WaitVisible(`#icon-brankas`, ByID)); err != nil {
		t.Fatal(err)
	}

	var urlstr string
	if err := Run(ctx, Location(&urlstr)); err != nil {
		t.Fatal(err)
	}

	if !strings.HasSuffix(urlstr, "image.html") {
		t.Errorf("expected to be on image.html, at: %s", urlstr)
	}

	var title string
	if err := Run(ctx, Title(&title)); err != nil {
		t.Fatal(err)
	}

	exptitle := "this is title"
	if title != exptitle {
		t.Errorf("expected title to contain google, instead title is: %s", title)
	}
}

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

	ctx, cancel := testAllocate(t, "")
	defer cancel()

	tests := []struct {
		file, waitID string
	}{
		{"form.html", "#form"},
		{"image.html", "#icon-brankas"},
	}

	var entries []*page.NavigationEntry
	var index int64
	if err := Run(ctx, NavigationEntries(&index, &entries)); err != nil {
		t.Fatal(err)
	}

	if len(entries) != 1 {
		t.Errorf("expected to have 1 navigation entry: got %d", len(entries))
	}
	if index != 0 {
		t.Errorf("expected navigation index is 0, got: %d", index)
	}

	expIdx, expEntries := 1, 2
	for i, test := range tests {
		if err := Run(ctx, Tasks{
			Navigate(testdataDir + "/" + test.file),
			WaitVisible(test.waitID, ByID),
			NavigationEntries(&index, &entries),
		}); err != nil {
			t.Fatal(err)
		}
		if len(entries) != expEntries {
			t.Errorf("test %d expected to have %d navigation entry: got %d", i, expEntries, len(entries))
		}
		if want := int64(i + 1); index != want {
			t.Errorf("test %d expected navigation index is %d, got: %d", i, want, index)
		}

		expIdx++
		expEntries++
	}
}

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

	ctx, cancel := testAllocate(t, "image.html")
	defer cancel()

	var entries []*page.NavigationEntry
	var index int64
	if err := Run(ctx, Tasks{
		WaitVisible(`#icon-brankas`, ByID), // for image.html
		NavigationEntries(&index, &entries),

		Navigate(testdataDir + "/form.html"),
		WaitVisible(`#form`, ByID), // for form.html
	}); err != nil {
		t.Fatal(err)
	}

	var title string
	if err := Run(ctx, Tasks{
		NavigateToHistoryEntry(entries[index].ID),
		WaitVisible(`#icon-brankas`, ByID), // for image.html
		Title(&title),
	}); err != nil {
		t.Fatal(err)
	}
	if title != entries[index].Title {
		t.Errorf("expected title to be %s, instead title is: %s", entries[index].Title, title)
	}
}

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

	ctx, cancel := testAllocate(t, "form.html")
	defer cancel()

	var title, exptitle string
	if err := Run(ctx, Tasks{
		WaitVisible(`#form`, ByID), // for form.html
		Title(&exptitle),

		Navigate(testdataDir + "/image.html"),
		WaitVisible(`#icon-brankas`, ByID), // for image.html

		NavigateBack(),
		WaitVisible(`#form`, ByID), // for form.html
		Title(&title),
	}); err != nil {
		t.Fatal(err)
	}

	if title != exptitle {
		t.Errorf("expected title to be %s, instead title is: %s", exptitle, title)
	}
}

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

	ctx, cancel := testAllocate(t, "form.html")
	defer cancel()

	var title, exptitle string
	if err := Run(ctx, Tasks{
		WaitVisible(`#form`, ByID), // for form.html

		Navigate(testdataDir + "/image.html"),
		WaitVisible(`#icon-brankas`, ByID), // for image.html
		Title(&exptitle),

		NavigateBack(),
		WaitVisible(`#form`, ByID), // for form.html

		NavigateForward(),
		WaitVisible(`#icon-brankas`, ByID), // for image.html
		Title(&title),
	}); err != nil {
		t.Fatal(err)
	}

	if title != exptitle {
		t.Errorf("expected title to be %s, instead title is: %s", exptitle, title)
	}
}

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

	ctx, cancel := testAllocate(t, "form.html")
	defer cancel()
	if err := Run(ctx, Stop()); err != nil {
		t.Fatal(err)
	}
}

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

	ctx, cancel := testAllocate(t, "form.html")
	defer cancel()

	var title, exptitle string
	if err := Run(ctx, Tasks{
		WaitVisible(`#form`, ByID), // for form.html
		Title(&exptitle),

		Reload(),
		// TODO: rewrite test to change the content after a reload, so
		// we can wait on a selector.
		Sleep(10 * time.Millisecond),
		WaitVisible(`#form`, ByID), // for form.html
		Title(&title),
	}); err != nil {
		t.Fatal(err)
	}

	if title != exptitle {
		t.Errorf("expected title to be %s, instead title is: %s", exptitle, title)
	}
}

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

	ctx, cancel := testAllocate(t, "image.html")
	defer cancel()

	// set the viewport size, to know what screenshot size to expect
	width, height := 650, 450
	var buf []byte
	if err := Run(ctx, Tasks{
		emulation.SetDeviceMetricsOverride(int64(width), int64(height), 1.0, false),
		WaitVisible(`#icon-brankas`, ByID), // for image.html
		CaptureScreenshot(&buf),
	}); err != nil {
		t.Fatal(err)
	}

	config, format, err := image.DecodeConfig(bytes.NewReader(buf))
	if err != nil {
		t.Fatal(err)
	}
	if want := "png"; format != want {
		t.Fatalf("expected format to be %q, got %q", want, format)
	}
	if config.Width != width || config.Height != height {
		t.Fatalf("expected dimensions to be %d*%d, got %d*%d",
			width, height, config.Width, config.Height)
	}
}

/*func TestAddOnLoadScript(t *testing.T) {
	t.Parallel()

	ctx, cancel := testAllocate(t, "")
	defer cancel()

	var scriptID page.ScriptIdentifier
	err = Run(ctx, AddOnLoadScript(`window.alert("TEST")`, &scriptID))
	if err != nil {
		t.Fatal(err)
	}

	err = Run(ctx, Navigate(testdataDir+"/form.html"))
	if err != nil {
		t.Fatal(err)
	}

	if scriptID == "" {
		t.Fatal("got empty script ID")
	}
	// TODO: Handle javascript dialog.
}

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

	ctx, cancel := testAllocate(t, "")
	defer cancel()

	var scriptID page.ScriptIdentifier
	err = Run(ctx, AddOnLoadScript(`window.alert("TEST")`, &scriptID))
	if err != nil {
		t.Fatal(err)
	}

	if scriptID == "" {
		t.Fatal("got empty script ID")
	}

	err = Run(ctx, RemoveOnLoadScript(scriptID))
	if err != nil {
		t.Fatal(err)
	}

	err = Run(ctx, Navigate(testdataDir+"/form.html"))
	if err != nil {
		t.Fatal(err)
	}
}*/

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

	ctx, cancel := testAllocate(t, "form.html")
	defer cancel()

	var urlstr string
	if err := Run(ctx, Tasks{
		WaitVisible(`#form`, ByID), // for form.html
		Location(&urlstr),
	}); err != nil {
		t.Fatal(err)
	}

	if !strings.HasSuffix(urlstr, "form.html") {
		t.Fatalf("expected to be on form.html, got: %s", urlstr)
	}
}

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

	ctx, cancel := testAllocate(t, "image.html")
	defer cancel()

	var title string
	if err := Run(ctx, Tasks{
		WaitVisible(`#icon-brankas`, ByID), // for image.html
		Title(&title),
	}); err != nil {
		t.Fatal(err)
	}

	exptitle := "this is title"
	if title != exptitle {
		t.Fatalf("expected title to be %s, got: %s", exptitle, title)
	}
}