/*
 * Copyright (C) 2019 The Android Open Source Project
 * Copyright (C) 2023 KonstaKANG
 *
 * 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.
 */

#include "Lights.h"

#include <android-base/file.h>

using ::android::base::ReadFileToString;
using ::android::base::WriteStringToFile;

namespace aidl::android::hardware::light {

static const uint32_t defaultMaxBrightness = 255;

static const std::string backlightBrightnessPath = "/sys/class/backlight/11-0045/brightness";
static const std::string backlightMaxBrightnessPath = "/sys/class/backlight/11-0045/max_brightness";

static const std::vector<HwLight> availableLights = {
    {.id = (int)LightType::BACKLIGHT, .type = LightType::BACKLIGHT, .ordinal = 0}
};

Lights::Lights() {
    maxBrightness = defaultMaxBrightness;

    if (!access(backlightMaxBrightnessPath.c_str(), R_OK)) {
        std::string maxBrightnessValue;
        if (ReadFileToString(backlightMaxBrightnessPath, &maxBrightnessValue)) {
            maxBrightness = std::stoi(maxBrightnessValue);
        }
    }
}

ndk::ScopedAStatus Lights::setLightState(int id, const HwLightState& state) {
    HwLight const& light = availableLights[id];
    std::string const brightness = std::to_string(rgbToScaledBrightness(state, maxBrightness));

    switch (light.type) {
        case LightType::BACKLIGHT:
            if (!access(backlightBrightnessPath.c_str(), W_OK)) {
                WriteStringToFile(brightness, backlightBrightnessPath);
            }
            break;
        default:
            return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
    }

    return ndk::ScopedAStatus::ok();
}

ndk::ScopedAStatus Lights::getLights(std::vector<HwLight>* lights) {
    for (auto i = availableLights.begin(); i != availableLights.end(); i++) {
        lights->push_back(*i);
    }

    return ndk::ScopedAStatus::ok();
}

uint32_t Lights::rgbToScaledBrightness(const HwLightState& state, uint32_t maxBrightness) {
    uint32_t color = state.color & 0x00ffffff;
    uint32_t brightness = ((77 * ((color >> 16) & 0xff)) + (150 * ((color >> 8) & 0xff)) +
            (29 * (color & 0xff))) >> 8;
    return brightness * maxBrightness / 0xff;
}

}  // aidl::android::hardware::light