package review

import (
	"context"
	"os"
	"strings"
	"testing"
	"time"

	"git.stormux.org/storm/cthulhu/internal/atspi"
)

// Run with a private Xvfb and D-Bus session, a visible Pluma window, and a
// short document containing "Alpha beta" on its first line.
func TestNativePageTabEditorFlatReview(t *testing.T) {
	if os.Getenv("CTHULHU_NATIVE_PAGE_TAB_EDITOR") != "1" {
		t.Skip("requires a private Pluma fixture")
	}
	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
	defer cancel()
	adapter := atspi.New()
	if err := adapter.Start(ctx); err != nil {
		t.Fatal(err)
	}
	defer adapter.Stop(context.Background())
	tree, err := adapter.CaptureDesktop(ctx)
	if err != nil {
		t.Fatal(err)
	}
	root, err := tree.Root()
	if err != nil {
		t.Fatal(err)
	}
	var focus atspi.ObjectID
	queue := []atspi.ObjectReference{root}
	for len(queue) > 0 {
		ref := queue[0]
		queue = queue[1:]
		snapshot, err := tree.Resolve(ref)
		if err != nil {
			t.Fatal(err)
		}
		if snapshot.ApplicationName == "pluma" && snapshot.Role == "text" {
			geometry, err := tree.Geometry(ref)
			if err != nil {
				t.Fatal(err)
			}
			if geometry.Showing {
				focus = snapshot.ID()
			}
		}
		for child, ok, err := tree.FirstChild(ref); ok && err == nil; child, ok, err = tree.NextSibling(child) {
			queue = append(queue, child)
		}
	}
	if !focus.Valid() {
		t.Fatal("visible Pluma editor not found")
	}
	reviewTree, err := adapter.CaptureReviewWindow(ctx, focus)
	if err != nil {
		t.Fatal(err)
	}
	cursor := &FlatCursor{}
	if err := cursor.Refresh(ctx, reviewTree, focus); err != nil {
		t.Fatal(err)
	}
	for _, tc := range []struct {
		unit FlatUnit
		step int
		want string
	}{
		{Word, 0, "Alpha"},
		{Character, 1, "l"},
		{Word, 1, "beta"},
	} {
		position, _, err := cursor.Read(tc.unit, tc.step)
		if err != nil || position.Object != focus || !position.HasOffset || strings.TrimSpace(position.Text) != tc.want {
			t.Fatalf("unit=%v step=%d: position=%+v err=%v", tc.unit, tc.step, position, err)
		}
	}
}