package app

import (
	"strings"
	"testing"

	"github.com/harrybrwn/patterm/internal/vt"
)

func TestRenderScreenSnapshotClipsRowsToViewport(t *testing.T) {
	layout := newTerminalLayout(20, 5)
	got := string(renderScreenSnapshot("abcdefghijklmnopqrstuvwxy\nsecond", vt.CursorState{}, layout))
	if strings.Contains(got, "uvwxy") {
		t.Fatalf("line leaked past viewport width: %q", got)
	}
	if !strings.Contains(got, "\x1b[2;1Habcdefghijklmnopqrst") {
		t.Fatalf("first row not drawn at viewport top: %q", got)
	}
	if !strings.Contains(got, "\x1b[3;1Hsecond              ") {
		t.Fatalf("second row not padded in viewport: %q", got)
	}
	if !strings.Contains(got, "\x1b[4;1H                    ") {
		t.Fatalf("blank viewport row not cleared: %q", got)
	}
}

func TestRenderScreenSnapshotPlacesCursorInsideViewport(t *testing.T) {
	layout := newTerminalLayout(20, 5)
	got := string(renderScreenSnapshot("abc", vt.CursorState{Col: 2, Row: 1, Visible: true}, layout))
	if !strings.HasSuffix(got, "\x1b[?25h\x1b[3;3H") {
		t.Fatalf("cursor not placed inside viewport: %q", got)
	}
}