package app

import (
	"context"
	"testing"

	"fast_reader/internal/settings"
)

func TestNewApp(t *testing.T) {
	a := NewApp()

	if a == nil {
		t.Fatal("NewApp() returned nil")
	}

	if got := a.GetSettings(); got != settings.Default() {
		t.Errorf("initial settings = %+v, want %+v",
			got, settings.Default())
	}
}

func TestStartup(t *testing.T) {
	application := NewApp()
	ctx := context.Background()

	// Startup should store the Wails application context.
	application.Startup(ctx)

	if application.ctx != ctx {
		t.Error("Startup() did not store the application context")
	}
}

func TestPrepareText(t *testing.T) {
	a := NewApp()

	words := a.PrepareText("Hello world")

	if len(words) != 2 {
		t.Fatalf("PrepareText() returned %d words, want 2", len(words))
	}

	if words[0].Text != "Hello" || words[1].Text != "world" {
		t.Errorf("unexpected words: %+v", words)
	}
}

func TestPrepareEmptyText(t *testing.T) {
	application := NewApp()

	got := application.PrepareText("")

	if len(got) != 0 {
		t.Errorf("PrepareText() returned %d words for empty input, want 0", len(got))
	}
}

func TestGetVersion(t *testing.T) {
	a := NewApp()

	if got := a.GetVersion(); got != "0.1.0" {
		t.Errorf("GetVersion() = %q, want %q", got, "0.1.0")
	}
}

func TestSaveAndLoadSettings(t *testing.T) {
	configDir := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", configDir)

	first := NewApp()
	first.Startup(context.Background())

	expected := settings.Settings{
		ReadingSpeed: 500,
		FontSize:     64,
		Theme:        settings.ThemeLight,
	}

	if err := first.SaveSettings(expected); err != nil {
		t.Fatalf("SaveSettings() error = %v", err)
	}

	if got := first.GetSettings(); got != expected {
		t.Errorf("settings = %+v, want %+v", got, expected)
	}

	// Simulate restarting the application.
	second := NewApp()
	second.Startup(context.Background())

	if got := second.GetSettings(); got != expected {
		t.Errorf("reloaded settings = %+v, want %+v", got, expected)
	}
}

func TestSaveSettingsNormalizesValues(t *testing.T) {
	t.Setenv("XDG_CONFIG_HOME", t.TempDir())

	a := NewApp()
	a.Startup(context.Background())

	input := settings.Settings{
		ReadingSpeed: 2000,
		FontSize:     10,
		Theme:        "invalid",
	}

	if err := a.SaveSettings(input); err != nil {
		t.Fatalf("SaveSettings() error = %v", err)
	}

	expected := settings.Settings{
		ReadingSpeed: settings.MaxReadingSpeed,
		FontSize:     settings.MinFontSize,
		Theme:        settings.ThemeDark,
	}

	if got := a.GetSettings(); got != expected {
		t.Errorf("settings = %+v, want %+v", got, expected)
	}
}

func TestResetSettings(t *testing.T) {
	t.Setenv("XDG_CONFIG_HOME", t.TempDir())

	a := NewApp()
	a.Startup(context.Background())

	custom := settings.Settings{
		ReadingSpeed: 600,
		FontSize:     72,
		Theme:        settings.ThemeLight,
	}

	if err := a.SaveSettings(custom); err != nil {
		t.Fatalf("SaveSettings() error = %v", err)
	}

	got, err := a.ResetSettings()
	if err != nil {
		t.Fatalf("ResetSettings() error = %v", err)
	}

	if got != settings.Default() {
		t.Errorf("ResetSettings() = %+v, want %+v",
			got, settings.Default())
	}

	if current := a.GetSettings(); current != settings.Default() {
		t.Errorf("current settings = %+v, want defaults %+v",
			current, settings.Default())
	}
}