/*
 * Copyright (C) 2018,2020-2021 The LineageOS Project
 *
 * 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.
 */

#define LOG_TAG "android.hardware.light@2.0-service.pro1"

#include <android-base/logging.h>
#include <hidl/HidlTransportSupport.h>
#include <utils/Errors.h>

#include "Light.h"

// libhwbinder:
using android::hardware::configureRpcThreadpool;
using android::hardware::joinRpcThreadpool;

// Generated HIDL files
using android::hardware::light::V2_0::ILight;
using android::hardware::light::V2_0::implementation::Led;
using android::hardware::light::V2_0::implementation::Light;

const static std::string kLcdBacklightPath = "/sys/class/leds/lcd-backlight/brightness";
const static std::string kLcdMaxBacklightPath = "/sys/class/leds/lcd-backlight/max_brightness";
const static std::string kKeyboardBacklightPath = "/sys/class/leds/keyboard-backlight/brightness";
const static std::string kKeyboardMaxBacklightPath = "/sys/class/leds/keyboard-backlight/max_brightness";
const static std::string kRgbBlinkPath = "/sys/class/leds/rgb/rgb_blink";

int main() {
    uint32_t lcdMaxBrightness = 255;
    uint32_t keyboardMaxBrightness = 255;
    std::vector<std::ofstream> buttonBacklight;

    std::ofstream lcdBacklight(kLcdBacklightPath);
    if (!lcdBacklight) {
        LOG(ERROR) << "Failed to open " << kLcdBacklightPath << ", error=" << errno
                   << " (" << strerror(errno) << ")";
        return -errno;
    }

    std::ifstream lcdMaxBacklight(kLcdMaxBacklightPath);
    if (!lcdMaxBacklight) {
        LOG(ERROR) << "Failed to open " << kLcdMaxBacklightPath << ", error=" << errno
                   << " (" << strerror(errno) << ")";
        return -errno;
    } else {
        lcdMaxBacklight >> lcdMaxBrightness;
    }

    std::ofstream keyboardBacklight(kKeyboardBacklightPath);
    if (!keyboardBacklight) {
        LOG(ERROR) << "Failed to open " << kKeyboardBacklightPath << ", error=" << errno
                   << " (" << strerror(errno) << ")";
        return -errno;
    }

    std::ifstream keyboardMaxBacklight(kKeyboardMaxBacklightPath);
    if (!keyboardMaxBacklight) {
        LOG(ERROR) << "Failed to open " << kKeyboardMaxBacklightPath << ", error=" << errno
                   << " (" << strerror(errno) << ")";
        return -errno;
    } else {
        keyboardMaxBacklight >> keyboardMaxBrightness;
    }

    Led redLed(0, "red");
    if (!redLed) {
        LOG(ERROR) << "Failed to create red LED";
        return -1;
    }

    Led greenLed(1, "green");
    if (!greenLed) {
        LOG(ERROR) << "Failed to create green LED";
        return -1;
    }

    Led blueLed(2, "blue");
    if (!blueLed) {
        LOG(ERROR) << "Failed to create blue LED";
        return -1;
    }

    std::ofstream rgbBlink(kRgbBlinkPath);
    if (!rgbBlink) {
        LOG(ERROR) << "Failed to open " << kRgbBlinkPath << ", error=" << errno
                   << " (" << strerror(errno) << ")";
        return -errno;
    }

    android::sp<ILight> service = new Light(
            {std::move( lcdBacklight), lcdMaxBrightness },
            {std::move( keyboardBacklight), keyboardMaxBrightness },
            std::move(redLed), std::move(greenLed), std::move(blueLed),
            std::move(rgbBlink));

    configureRpcThreadpool(1, true);

    android::status_t status = service->registerAsService();

    if (status != android::OK) {
        LOG(ERROR) << "Cannot register Light HAL service";
        return 1;
    }

    LOG(INFO) << "Light HAL Ready.";
    joinRpcThreadpool();
    // Under normal cases, execution will not reach this line.
    LOG(ERROR) << "Light HAL failed to join thread pool.";
    return 1;
}