// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "flutter/shell/platform/linux/fl_key_channel_responder.h"

#include "gtest/gtest.h"

#include "flutter/shell/platform/linux/fl_binary_messenger_private.h"
#include "flutter/shell/platform/linux/fl_engine_private.h"
#include "flutter/shell/platform/linux/testing/fl_test.h"

static const char* expected_value = nullptr;
static gboolean expected_handled = FALSE;

static FlValue* echo_response_cb(FlValue* echoed_value) {
  gchar* text = fl_value_to_string(echoed_value);
  EXPECT_STREQ(text, expected_value);
  g_free(text);

  FlValue* value = fl_value_new_map();
  fl_value_set_string_take(value, "handled",
                           fl_value_new_bool(expected_handled));
  return value;
}

static void responder_callback(bool handled, gpointer user_data) {
  EXPECT_EQ(handled, expected_handled);
  g_main_loop_quit(static_cast<GMainLoop*>(user_data));
}

// Clone string onto the heap.
//
// If #string is nullptr, returns nullptr.  Otherwise, the returned pointer must
// be freed with g_free.
static char* clone_string(const char* string) {
  if (string == nullptr) {
    return nullptr;
  }
  size_t len = strlen(string);
  char* result = g_new(char, len + 1);
  strncpy(result, string, len + 1);
  return result;
}

namespace {
// A global variable to store new event. It is a global variable so that it can
// be returned by #fl_key_event_new_by_mock for easy use.
FlKeyEvent _g_key_event;
}  // namespace

// Create a new #FlKeyEvent with the given information.
//
// This event is passed to #fl_key_responder_handle_event,
// which assumes that the event is managed by callee.
// Therefore #fl_key_event_new_by_mock doesn't need to
// dynamically allocate, but reuses the same global object.
static FlKeyEvent* fl_key_event_new_by_mock(guint32 time_in_milliseconds,
                                            bool is_press,
                                            guint keyval,
                                            guint16 keycode,
                                            int state,
                                            const char* string,
                                            gboolean is_modifier) {
  if (_g_key_event.string != nullptr) {
    g_free(const_cast<char*>(_g_key_event.string));
  }
  _g_key_event.is_press = is_press;
  _g_key_event.time = time_in_milliseconds;
  _g_key_event.state = state;
  _g_key_event.keyval = keyval;
  _g_key_event.string = clone_string(string);
  _g_key_event.keycode = keycode;
  _g_key_event.origin = nullptr;
  _g_key_event.dispose_origin = nullptr;
  return &_g_key_event;
}

// Test sending a letter "A";
TEST(FlKeyChannelResponderTest, SendKeyEvent) {
  g_autoptr(GMainLoop) loop = g_main_loop_new(nullptr, 0);

  g_autoptr(FlEngine) engine = make_mock_engine();
  g_autoptr(FlBinaryMessenger) messenger = fl_binary_messenger_new(engine);
  FlKeyChannelResponderMock mock{
      .value_converter = echo_response_cb,
      .channel_name = "test/echo",
  };
  g_autoptr(FlKeyResponder) responder =
      FL_KEY_RESPONDER(fl_key_channel_responder_new(messenger, &mock));

  fl_key_responder_handle_event(
      responder,
      fl_key_event_new_by_mock(12345, true, GDK_KEY_A, 0x04, 0x0, "A", false),
      responder_callback, loop);
  expected_value =
      "{type: keydown, keymap: linux, scanCode: 4, toolkit: gtk, keyCode: 65, "
      "modifiers: 0, unicodeScalarValues: 65}";
  expected_handled = FALSE;

  // Blocks here until echo_response_cb is called.
  g_main_loop_run(loop);

  fl_key_responder_handle_event(
      responder,
      fl_key_event_new_by_mock(23456, false, GDK_KEY_A, 0x04, 0x0, "A", false),
      responder_callback, loop);
  expected_value =
      "{type: keyup, keymap: linux, scanCode: 4, toolkit: gtk, keyCode: 65, "
      "modifiers: 0, unicodeScalarValues: 65}";
  expected_handled = FALSE;

  // Blocks here until echo_response_cb is called.
  g_main_loop_run(loop);
}

void test_lock_event(guint key_code,
                     const char* down_expected,
                     const char* up_expected) {
  g_autoptr(GMainLoop) loop = g_main_loop_new(nullptr, 0);

  g_autoptr(FlEngine) engine = make_mock_engine();
  g_autoptr(FlBinaryMessenger) messenger = fl_binary_messenger_new(engine);
  FlKeyChannelResponderMock mock{
      .value_converter = echo_response_cb,
      .channel_name = "test/echo",
  };
  g_autoptr(FlKeyResponder) responder =
      FL_KEY_RESPONDER(fl_key_channel_responder_new(messenger, &mock));

  fl_key_responder_handle_event(
      responder,
      fl_key_event_new_by_mock(12345, true, key_code, 0x04, 0x0, nullptr,
                               false),
      responder_callback, loop);
  expected_value = down_expected;
  expected_handled = FALSE;

  // Blocks here until echo_response_cb is called.
  g_main_loop_run(loop);

  expected_value = up_expected;
  expected_handled = FALSE;
  fl_key_responder_handle_event(
      responder,
      fl_key_event_new_by_mock(12346, false, key_code, 0x04, 0x0, nullptr,
                               false),
      responder_callback, loop);

  // Blocks here until echo_response_cb is called.
  g_main_loop_run(loop);
}

// Test sending a "NumLock" keypress.
TEST(FlKeyChannelResponderTest, SendNumLockKeyEvent) {
  test_lock_event(GDK_KEY_Num_Lock,
                  "{type: keydown, keymap: linux, scanCode: 4, toolkit: gtk, "
                  "keyCode: 65407, modifiers: 16}",
                  "{type: keyup, keymap: linux, scanCode: 4, toolkit: gtk, "
                  "keyCode: 65407, modifiers: 0}");
}

// Test sending a "CapsLock" keypress.
TEST(FlKeyChannelResponderTest, SendCapsLockKeyEvent) {
  test_lock_event(GDK_KEY_Caps_Lock,
                  "{type: keydown, keymap: linux, scanCode: 4, toolkit: gtk, "
                  "keyCode: 65509, modifiers: 2}",
                  "{type: keyup, keymap: linux, scanCode: 4, toolkit: gtk, "
                  "keyCode: 65509, modifiers: 0}");
}

// Test sending a "ShiftLock" keypress.
TEST(FlKeyChannelResponderTest, SendShiftLockKeyEvent) {
  test_lock_event(GDK_KEY_Shift_Lock,
                  "{type: keydown, keymap: linux, scanCode: 4, toolkit: gtk, "
                  "keyCode: 65510, modifiers: 2}",
                  "{type: keyup, keymap: linux, scanCode: 4, toolkit: gtk, "
                  "keyCode: 65510, modifiers: 0}");
}

TEST(FlKeyChannelResponderTest, TestKeyEventHandledByFramework) {
  g_autoptr(GMainLoop) loop = g_main_loop_new(nullptr, 0);

  g_autoptr(FlEngine) engine = make_mock_engine();
  g_autoptr(FlBinaryMessenger) messenger = fl_binary_messenger_new(engine);
  FlKeyChannelResponderMock mock{
      .value_converter = echo_response_cb,
      .channel_name = "test/echo",
  };
  g_autoptr(FlKeyResponder) responder =
      FL_KEY_RESPONDER(fl_key_channel_responder_new(messenger, &mock));

  fl_key_responder_handle_event(
      responder,
      fl_key_event_new_by_mock(12345, true, GDK_KEY_A, 0x04, 0x0, nullptr,
                               false),
      responder_callback, loop);
  expected_handled = TRUE;
  expected_value =
      "{type: keydown, keymap: linux, scanCode: 4, toolkit: gtk, "
      "keyCode: 65, modifiers: 0, unicodeScalarValues: 65}";

  // Blocks here until echo_response_cb is called.
  g_main_loop_run(loop);
}