package ui

import (
	"strings"
	"testing"
)

const sampleDump = `<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
<hierarchy rotation="0">
  <node index="0" text="" class="android.widget.FrameLayout" package="com.tailscale.ipn" clickable="false" enabled="true" scrollable="false" bounds="[0,0][1080,2400]">
    <node index="0" text="samuelrolfe@gmail.com" class="android.widget.TextView" package="com.tailscale.ipn" clickable="false" enabled="true" bounds="[221,155][798,217]"/>
    <node index="1" text="Connected" class="android.widget.TextView" package="com.tailscale.ipn" clickable="false" enabled="true" bounds="[221,217][453,277]"/>
    <node index="2" text="" content-desc="Navigate up" class="android.widget.ImageButton" package="com.tailscale.ipn" clickable="true" enabled="true" bounds="[42,121][189,268]"/>
  </node>
  <node index="1" text="Network and internet" class="android.widget.TextView" package="com.android.settings" clickable="true" enabled="true" bounds="[221,663][748,727]">
    <node index="0" text="Network and internet" class="android.widget.TextView" package="com.android.settings" clickable="false" enabled="true" bounds="[221,663][748,727]"/>
  </node>
  <node index="2" text="Disabled thing" class="android.widget.TextView" package="com.android.settings" clickable="true" enabled="false" bounds="[0,0][10,10]"/>
</hierarchy>`

func parseSample(t *testing.T) *Hierarchy {
	t.Helper()
	h, err := parseHierarchy([]byte(sampleDump))
	if err != nil {
		t.Fatalf("parseHierarchy: %v", err)
	}
	return h
}

func TestBoundsAndCenter(t *testing.T) {
	n := &Node{Bounds: "[221,155][798,217]"}
	r, err := n.BoundsRect()
	if err != nil {
		t.Fatalf("BoundsRect: %v", err)
	}
	if r.X1 != 221 || r.Y1 != 155 || r.X2 != 798 || r.Y2 != 217 {
		t.Fatalf("unexpected rect %+v", r)
	}
	cx, cy, err := n.Center()
	if err != nil {
		t.Fatalf("Center: %v", err)
	}
	if cx != (221+798)/2 || cy != (155+217)/2 {
		t.Fatalf("unexpected centre (%d,%d)", cx, cy)
	}
}

func TestBoundsRejectsGarbage(t *testing.T) {
	for _, bad := range []string{"", "nope", "[1,2][3,4]junk", "[10,10][10,20]"} {
		if _, err := (&Node{Bounds: bad}).BoundsRect(); err == nil {
			t.Fatalf("expected error for bounds %q", bad)
		}
	}
}

func TestFindTextExactAndSubstring(t *testing.T) {
	h := parseSample(t)

	if got := len(h.FindText("Connected", true)); got != 1 {
		t.Fatalf("exact match: want 1, got %d", got)
	}
	// Substring is case-insensitive and matches more than one node.
	if got := len(h.FindText("network", false)); got != 2 {
		t.Fatalf("substring match: want 2 (parent + child), got %d", got)
	}
	// Content descriptions count as text.
	matches := h.FindText("Navigate up", true)
	if len(matches) != 1 || !matches[0].Clickable {
		t.Fatalf("content-desc match failed: %+v", matches)
	}
	if got := h.FindText("does not exist", false); got != nil {
		t.Fatalf("expected no matches, got %d", len(got))
	}
}

func TestPickBestMatchPrefersClickable(t *testing.T) {
	h := parseSample(t)
	matches := h.FindText("network", false)
	if len(matches) != 2 {
		t.Fatalf("want 2 matches, got %d", len(matches))
	}
	best, err := pickBestMatch(matches)
	if err != nil {
		t.Fatalf("pickBestMatch: %v", err)
	}
	if !best.Clickable {
		t.Fatalf("expected a clickable match, got %s", best.Label())
	}
}

func TestPickBestMatchRejectsDisabledOnly(t *testing.T) {
	h := parseSample(t)
	matches := h.FindText("Disabled thing", true)
	if len(matches) != 1 {
		t.Fatalf("want 1 match, got %d", len(matches))
	}
	if _, err := pickBestMatch(matches); err == nil {
		t.Fatal("expected an error when the only match is disabled")
	}
}

func TestEscapeInputText(t *testing.T) {
	cases := map[string]string{
		"hello world":    "'hello%sworld'",
		"Rolling Stones": "'Rolling%sStones'",
		"it's":           `'it'\''s'`,
	}
	for in, want := range cases {
		if got := escapeInputText(in); got != want {
			t.Errorf("escapeInputText(%q) = %q, want %q", in, got, want)
		}
	}
	// A single quote must not be able to break out of the quoting.
	got := escapeInputText("a'; rm -rf /; 'b")
	if strings.Count(got, "'")%2 != 0 {
		t.Fatalf("unbalanced quotes in %q", got)
	}
}