/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef UI_APPEARANCE_DARK_MODE_MANAGER_H
#define UI_APPEARANCE_DARK_MODE_MANAGER_H

#include <functional>
#include <vector>

#include "errors.h"
#include "nocopyable.h"
#include "alarm_timer_manager.h"

namespace OHOS::ArkUi::UiAppearance {
class DarkModeManager final : public NoCopyable {
public:
    static DarkModeManager &GetInstance();

    ErrCode Initialize(const std::function<void(bool, int32_t)> &updateCallback);

    ErrCode LoadUserSettingData(int32_t userId, bool needUpdateCallback, bool &isDarkMode);

    void NotifyDarkModeUpdate(int32_t userId, bool isDarkMode);

    ErrCode OnSwitchUser(int32_t userId);

    ErrCode RestartTimer();

    void Dump();

private:
    enum DarkModeMode {
        DARK_MODE_INVALID = -1,
        DARK_MODE_ALWAYS_LIGHT = 0,
        DARK_MODE_ALWAYS_DARK = 1,
        DARK_MODE_CUSTOM_AUTO = 2,
        DARK_MODE_SIZE,
    };

    struct DarkModeState {
        DarkModeMode settingMode = DARK_MODE_INVALID;
        int32_t settingStartTime = -1;
        int32_t settingEndTime = -1;
    };

    void LoadSettingDataObserversCallback();

    ErrCode RegisterSettingDataObserversLocked(int32_t userId) const;

    void UnregisterSettingDataObserversLocked(int32_t userId) const;

    void SettingDataDarkModeModeUpdateFunc(const std::string& key, int32_t userId);

    void SettingDataDarkModeStartTimeUpdateFunc(const std::string& key, int32_t userId);

    void SettingDataDarkModeEndTimeUpdateFunc(const std::string& key, int32_t userId);

    ErrCode OnStateChangeLocked(int32_t userId, bool needUpdateCallback, bool &isDarkMode);

    ErrCode OnStateChangeToAllDayMode(int32_t userId, DarkModeMode darkMode, bool needUpdateCallback, bool &isDarkMode);

    ErrCode OnStateChangeToCustomAutoMode(
        int32_t userId, const DarkModeState& state, bool needUpdateCallback, bool &isDarkMode);

    void OnChangeDarkMode(DarkModeMode mode, int32_t userId) const;

    ErrCode CreateOrUpdateTimers(int32_t startTime, int32_t endTime, int32_t userId);

    ErrCode CheckTimerCallbackParams(int32_t startTime, int32_t endTime, int32_t userId);

    std::mutex settingDataObserversMutex_;
    std::vector<std::pair<std::string, std::function<void(const std::string&, int32_t)>>> settingDataObservers_;
    int32_t settingDataObserversUserId_ = -1;

    AlarmTimerManager alarmTimerManager_;
    std::mutex darkModeStatesMutex_;
    std::map<int32_t, DarkModeState> darkModeStates_;

    std::function<void(bool, int32_t)> updateCallback_;
};
} // namespace OHOS::ArkUi::UiAppearance

#endif // UI_APPEARANCE_DARK_MODE_MANAGER_H