// Copyright (c) 2026 Storm Dragon
// Authors: Storm Dragon, Angus Kola
// SPDX-License-Identifier: GPL-3.0-or-later

package app

import (
	"bytes"
	"errors"
	"log/slog"
	"os"
	"path/filepath"
	"reflect"
	"testing"

	"git.stormux.org/storm/cthulhu/internal/config"
	"git.stormux.org/storm/cthulhu/internal/input"
	"git.stormux.org/storm/cthulhu/internal/preferences"
)

func TestLaptopLayoutSessionAndExplicitPreferences(t *testing.T) {
	global := config.DefaultSettings()
	global.Path = filepath.Join(t.TempDir(), "settings.toml")
	store, err := config.NewStore(global.Path)
	if err != nil {
		t.Fatal(err)
	}
	if err := store.Save(global); err != nil {
		t.Fatal(err)
	}
	app := global
	app.CthulhuModifierKeys = []string{"Insert"}
	app.TimeFormat = "24-hour"
	for _, name := range []string{"Cached Application", "New Application"} {
		if err := store.SaveForApplication(name, app); err != nil {
			t.Fatal(err)
		}
	}
	original, err := os.ReadFile(global.Path)
	if err != nil {
		t.Fatal(err)
	}
	worker := newPreferencesWorker(slog.New(slog.DiscardHandler), global, acceptingRemoteSpeechSettings{})
	worker.laptopLayout = true
	worker.settings = worker.sessionKeyboard(global)
	worker.live = &liveSettings{}
	worker.live.Store(worker.settings)
	recorder := &keyboardRecorder{}
	worker.bindings = recorder
	checkLaptop := func(settings config.Settings) {
		t.Helper()
		if settings.KeyboardLayout != int(input.LaptopKeyboardLayout) ||
			!reflect.DeepEqual(settings.CthulhuModifierKeys, []string{"Caps_Lock"}) {
			t.Fatalf("laptop keyboard lost: layout=%d keys=%v", settings.KeyboardLayout, settings.CthulhuModifierKeys)
		}
	}
	checkLaptop(worker.settings)
	worker.cycle_progress_output()
	if worker.globalSettings.KeyboardLayout != global.KeyboardLayout || !reflect.DeepEqual(worker.globalSettings.CthulhuModifierKeys, global.CthulhuModifierKeys) {
		t.Fatal("progress shortcut cached the startup keyboard in global settings")
	}
	for _, name := range []string{"Cached Application", "Other Application", "Cached Application", "New Application"} {
		worker.switchApplication(t.Context(), name)
		if worker.activeApp != name {
			t.Fatal("application switch failed")
		}
		checkLaptop(worker.settings)
		checkLaptop(worker.live.Load())
		if name != "Other Application" && worker.settings.TimeFormat != "24-hour" {
			t.Fatal("startup keyboard override discarded application preferences")
		}
	}
	current, err := os.ReadFile(global.Path)
	if err != nil || !bytes.Equal(current, original) {
		t.Fatalf("switching applications saved the override: %v", err)
	}
	// A remote session change and the speech-save shortcut must not promote
	// the startup keyboard override into global or cached profile settings.
	next := worker.settings
	next.EnableKeyEcho = true
	if response := worker.applyNext(t.Context(), next, false, false); !response.Accepted {
		t.Fatal(response.Message)
	}
	worker.cycle_progress_output()
	cached := worker.appSettings[worker.activeApp]
	if cached.KeyboardLayout != app.KeyboardLayout || !reflect.DeepEqual(cached.CthulhuModifierKeys, app.CthulhuModifierKeys) {
		t.Fatal("session changes cached the startup keyboard in application settings")
	}
	worker.handleSpeechCommand(t.Context(), input.IncreaseSpeechSetting)
	worker.handleSpeechCommand(t.Context(), input.SaveSpeechSettings)
	loaded, err := store.Load()
	if err != nil || loaded.KeyboardLayout != global.KeyboardLayout || !reflect.DeepEqual(loaded.CthulhuModifierKeys, global.CthulhuModifierKeys) {
		t.Fatalf("speech save changed the saved keyboard: %v", err)
	}
	worker.switchApplication(t.Context(), "Other Application")
	worker.switchApplication(t.Context(), "New Application")
	checkLaptop(worker.settings)
	if !worker.settings.EnableKeyEcho {
		t.Fatal("remote application change was lost")
	}
	if !worker.beginEdit(t.Context(), "") {
		t.Fatal("could not open global preferences")
	}
	checkLaptop(worker.editing)
	values := preferences.FromSettings(worker.editing)
	values.KeyboardLayout = global.KeyboardLayout
	values.CthulhuModifierKeys = global.CthulhuModifierKeys
	recorder.err = errors.New("grab conflict")
	if response := worker.apply(t.Context(), preferences.Request{Values: values}); response.Accepted || !worker.laptopLayout {
		t.Fatal("failed preferences apply discarded the startup override")
	}
	checkLaptop(worker.settings)
	// Saving the displayed laptop choice explicitly makes it permanent.
	recorder.err = nil
	values = preferences.FromSettings(worker.editing)
	if response := worker.apply(t.Context(), preferences.Request{Values: values, Save: true}); !response.Accepted || worker.laptopLayout {
		t.Fatalf("explicit save did not replace the startup override: %+v", response)
	}
	loaded, err = store.Load()
	if err != nil {
		t.Fatal(err)
	}
	checkLaptop(loaded)
	worker.editingActive = false
	if !worker.beginEdit(t.Context(), "") {
		t.Fatal("could not reopen preferences")
	}
	values = preferences.FromSettings(worker.editing)
	values.KeyboardLayout = global.KeyboardLayout
	values.CthulhuModifierKeys = global.CthulhuModifierKeys
	if response := worker.apply(t.Context(), preferences.Request{Values: values}); !response.Accepted {
		t.Fatal(response.Message)
	}
	worker.editingActive = false
	worker.switchApplication(t.Context(), "Another Application")
	if worker.settings.KeyboardLayout != global.KeyboardLayout || !reflect.DeepEqual(worker.settings.CthulhuModifierKeys, global.CthulhuModifierKeys) {
		t.Fatal("preferences could not replace the laptop keyboard for the session")
	}
}