/*
 * Copyright (C) 2018 The Android Open Source 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 ATRACE_TAG (ATRACE_TAG_POWER | ATRACE_TAG_HAL)
#define LOG_TAG "android.hardware.power@1.3-service.samsung-libperfmgr"

#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>

#include <mutex>

#include <utils/Log.h>
#include <utils/Trace.h>

#include "Power.h"

namespace android {
namespace hardware {
namespace power {
namespace V1_3 {
namespace implementation {

using ::android::hardware::hidl_vec;
using ::android::hardware::Return;
using ::android::hardware::Void;
using ::android::hardware::power::V1_0::Feature;
using ::android::hardware::power::V1_0::Status;
using namespace std::chrono_literals;

constexpr char kPowerHalStateProp[] = "vendor.powerhal.state";
constexpr char kPowerHalAudioProp[] = "vendor.powerhal.audio";
constexpr char kPowerHalInitProp[] = "vendor.powerhal.init";
constexpr char kPowerHalRenderingProp[] = "vendor.powerhal.rendering";
constexpr char kPowerHalProfileNumProp[] = "vendor.powerhal.perf_profiles";
constexpr char kPowerHalProfileProp[] = "vendor.powerhal.perf_profile";
constexpr char kPowerHalConfigPath[] = "/vendor/etc/powerhint.json";

Power::Power()
    : mHintManager(nullptr),
      mInteractionHandler(nullptr),
      mVRModeOn(false),
      mSustainedPerfModeOn(false),
      mCameraStreamingMode(false),
      mReady(false),
      mDoubleTapEnabled(false),
      mNumPerfProfiles(0),
      mCurrentPerfProfile(PowerProfile::BALANCED) {
    mInitThread = std::thread([this]() {
        android::base::WaitForProperty(kPowerHalInitProp, "1");
        mHintManager = HintManager::GetFromJSON(kPowerHalConfigPath);
        if (!mHintManager) {
            LOG(FATAL) << "Invalid config: " << kPowerHalConfigPath;
        }
        mInteractionHandler = std::make_unique<InteractionHandler>(mHintManager);
        mInteractionHandler->Init();
        std::string state = android::base::GetProperty(kPowerHalStateProp, "");
        if (state == "CAMERA_STREAMING") {
            ALOGI("Initialize with CAMERA_STREAMING on");
            mHintManager->DoHint("CAMERA_STREAMING");
            mCameraStreamingMode = true;
        } else if (state == "SUSTAINED_PERFORMANCE") {
            ALOGI("Initialize with SUSTAINED_PERFORMANCE on");
            mHintManager->DoHint("SUSTAINED_PERFORMANCE");
            mSustainedPerfModeOn = true;
        } else if (state == "VR_MODE") {
            ALOGI("Initialize with VR_MODE on");
            mHintManager->DoHint("VR_MODE");
            mVRModeOn = true;
        } else if (state == "VR_SUSTAINED_PERFORMANCE") {
            ALOGI("Initialize with SUSTAINED_PERFORMANCE and VR_MODE on");
            mHintManager->DoHint("VR_SUSTAINED_PERFORMANCE");
            mSustainedPerfModeOn = true;
            mVRModeOn = true;
        } else {
            ALOGI("Initialize PowerHAL");
        }

        state = android::base::GetProperty(kPowerHalAudioProp, "");
        if (state == "AUDIO_LOW_LATENCY") {
            ALOGI("Initialize with AUDIO_LOW_LATENCY on");
            mHintManager->DoHint("AUDIO_LOW_LATENCY");
        }

        state = android::base::GetProperty(kPowerHalRenderingProp, "");
        if (state == "EXPENSIVE_RENDERING") {
            ALOGI("Initialize with EXPENSIVE_RENDERING on");
            mHintManager->DoHint("EXPENSIVE_RENDERING");
        }

        state = android::base::GetProperty(kPowerHalProfileProp, "");
        if (state == "POWER_SAVE") {
            ALOGI("Initialize with POWER_SAVE profile");
            setProfile(PowerProfile::POWER_SAVE);
            mCurrentPerfProfile = PowerProfile::POWER_SAVE;
        } else if (state == "BIAS_POWER_SAVE") {
            ALOGI("Initialize with BIAS_POWER_SAVE profile");
            setProfile(PowerProfile::BIAS_POWER_SAVE);
            mCurrentPerfProfile = PowerProfile::BIAS_POWER_SAVE;
        } else if (state == "BIAS_PERFORMANCE") {
            ALOGI("Initialize with BIAS_PERFORMANCE profile");
            setProfile(PowerProfile::BIAS_PERFORMANCE);
            mCurrentPerfProfile = PowerProfile::BIAS_PERFORMANCE;
        } else if (state == "HIGH_PERFORMANCE") {
            ALOGI("Initialize with HIGH_PERFORMANCE profile");
            setProfile(PowerProfile::HIGH_PERFORMANCE);
            mCurrentPerfProfile = PowerProfile::HIGH_PERFORMANCE;
        }

        // Now start to take powerhint
        mReady.store(true);
        ALOGI("PowerHAL ready to process hints");
    });
    mNumPerfProfiles = android::base::GetIntProperty(kPowerHalProfileNumProp, 0);
    mInitThread.detach();
}

Return<void> Power::updateHint(const char *hint, bool enable) {
    if (!mReady) {
        return Void();
    }
    if (enable) {
        mHintManager->DoHint(hint);
    } else {
        mHintManager->EndHint(hint);
    }
    return Void();
}

Return<void> Power::setProfile(PowerProfile profile) {
    if (mCurrentPerfProfile == profile) {
        return Void();
    }

    // End previous perf profile hints
    switch (mCurrentPerfProfile) {
        case PowerProfile::POWER_SAVE:
            mHintManager->EndHint("PROFILE_POWER_SAVE");
            break;
        case PowerProfile::BIAS_POWER_SAVE:
            mHintManager->EndHint("PROFILE_BIAS_POWER_SAVE");
            break;
        case PowerProfile::BIAS_PERFORMANCE:
            mHintManager->EndHint("PROFILE_BIAS_PERFORMANCE");
            break;
        case PowerProfile::HIGH_PERFORMANCE:
            mHintManager->EndHint("PROFILE_HIGH_PERFORMANCE");
            break;
        default:
            break;
    }

    // Apply perf profile hints
    switch (profile) {
        case PowerProfile::POWER_SAVE:
            mHintManager->DoHint("PROFILE_POWER_SAVE");
            break;
        case PowerProfile::BIAS_POWER_SAVE:
            mHintManager->DoHint("PROFILE_BIAS_POWER_SAVE");
            break;
        case PowerProfile::BIAS_PERFORMANCE:
            mHintManager->DoHint("PROFILE_BIAS_PERFORMANCE");
            break;
        case PowerProfile::HIGH_PERFORMANCE:
            mHintManager->DoHint("PROFILE_HIGH_PERFORMANCE");
            break;
        default:
            break;
    }

    return Void();
}

// Methods from ::android::hardware::power::V1_0::IPower follow.
Return<void> Power::setInteractive(bool interactive) {
    // Enable dt2w before turning TSP off
    if (mDoubleTapEnabled && !interactive) {
       updateHint("DOUBLE_TAP_TO_WAKE", true);
       // It takes some time till the cmd is executed in the Kernel, there
       // is an interface to check that. To avoid that just wait for 25ms
       // till we turn off the touchscreen and lcd.
       std::this_thread::sleep_for(25ms);
    }

    updateHint("NOT_INTERACTIVE", !interactive);

    // Disable dt2w after turning TSP back on
    if (mDoubleTapEnabled && interactive) {
       updateHint("DOUBLE_TAP_TO_WAKE", false);
    }

    return Void();
}

Return<void> Power::powerHint(PowerHint_1_0 hint, int32_t data) {
    if (!mReady) {
        return Void();
    }
    ATRACE_INT(android::hardware::power::V1_0::toString(hint).c_str(), data);
    ALOGD_IF(hint != PowerHint_1_0::INTERACTION, "%s: %d",
             android::hardware::power::V1_0::toString(hint).c_str(), static_cast<int>(data));
    switch (hint) {
        case PowerHint_1_0::INTERACTION:
            if (mVRModeOn || mSustainedPerfModeOn) {
                ALOGV("%s: ignoring due to other active perf hints", __func__);
            } else {
                mInteractionHandler->Acquire(data);
            }
            break;
        case PowerHint_1_0::SUSTAINED_PERFORMANCE:
            if (data && !mSustainedPerfModeOn) {
                if (!mVRModeOn) {  // Sustained mode only.
                    mHintManager->DoHint("SUSTAINED_PERFORMANCE");
                } else {  // Sustained + VR mode.
                    mHintManager->EndHint("VR_MODE");
                    mHintManager->DoHint("VR_SUSTAINED_PERFORMANCE");
                }
                mSustainedPerfModeOn = true;
            } else if (!data && mSustainedPerfModeOn) {
                mHintManager->EndHint("VR_SUSTAINED_PERFORMANCE");
                mHintManager->EndHint("SUSTAINED_PERFORMANCE");
                if (mVRModeOn) {  // Switch back to VR Mode.
                    mHintManager->DoHint("VR_MODE");
                }
                mSustainedPerfModeOn = false;
            }
            break;
        case PowerHint_1_0::VR_MODE:
            if (data && !mVRModeOn) {
                if (!mSustainedPerfModeOn) {  // VR mode only.
                    mHintManager->DoHint("VR_MODE");
                } else {  // Sustained + VR mode.
                    mHintManager->EndHint("SUSTAINED_PERFORMANCE");
                    mHintManager->DoHint("VR_SUSTAINED_PERFORMANCE");
                }
                mVRModeOn = true;
            } else if (!data && mVRModeOn) {
                mHintManager->EndHint("VR_SUSTAINED_PERFORMANCE");
                mHintManager->EndHint("VR_MODE");
                if (mSustainedPerfModeOn) {  // Switch back to sustained Mode.
                    mHintManager->DoHint("SUSTAINED_PERFORMANCE");
                }
                mVRModeOn = false;
            }
            break;
        case PowerHint_1_0::LAUNCH:
            if (mVRModeOn || mSustainedPerfModeOn) {
                ALOGV("%s: ignoring due to other active perf hints", __func__);
            } else {
                if (data) {
                    // Hint until canceled
                    mHintManager->DoHint("LAUNCH");
                } else {
                    mHintManager->EndHint("LAUNCH");
                }
            }
            break;
        case PowerHint_1_0::LOW_POWER:
            break;
        default:
            break;
    }
    return Void();
}

Return<void> Power::setFeature(Feature feature, bool activate) {
    switch (feature) {
        case Feature::POWER_FEATURE_DOUBLE_TAP_TO_WAKE:
            mDoubleTapEnabled = activate;
            break;
        default:
            break;
    }
    return Void();
}

Return<void> Power::getPlatformLowPowerStats(getPlatformLowPowerStats_cb _hidl_cb) {
    LOG(ERROR) << "getPlatformLowPowerStats not supported. Use IPowerStats HAL.";
    _hidl_cb({}, Status::SUCCESS);
    return Void();
}

// Methods from ::android::hardware::power::V1_1::IPower follow.
Return<void> Power::getSubsystemLowPowerStats(getSubsystemLowPowerStats_cb _hidl_cb) {
    LOG(ERROR) << "getSubsystemLowPowerStats not supported. Use IPowerStats HAL.";
    _hidl_cb({}, Status::SUCCESS);
    return Void();
}

Return<void> Power::powerHintAsync(PowerHint_1_0 hint, int32_t data) {
    // just call the normal power hint in this oneway function
    return powerHint(hint, data);
}

// Methods from ::android::hardware::power::V1_2::IPower follow.
Return<void> Power::powerHintAsync_1_2(PowerHint_1_2 hint, int32_t data) {
    if (!mReady) {
        return Void();
    }

    ATRACE_INT(android::hardware::power::V1_2::toString(hint).c_str(), data);
    ALOGD_IF(hint >= PowerHint_1_2::AUDIO_STREAMING, "%s: %d",
             android::hardware::power::V1_2::toString(hint).c_str(), static_cast<int>(data));

    switch (hint) {
        case PowerHint_1_2::AUDIO_LOW_LATENCY:
            if (data) {
                // Hint until canceled
                mHintManager->DoHint("AUDIO_LOW_LATENCY");
            } else {
                mHintManager->EndHint("AUDIO_LOW_LATENCY");
            }
            break;
        case PowerHint_1_2::AUDIO_STREAMING:
            if (mVRModeOn || mSustainedPerfModeOn) {
                ALOGV("%s: ignoring due to other active perf hints", __func__);
            } else {
                if (data) {
                    mHintManager->DoHint("AUDIO_STREAMING");
                } else {
                    mHintManager->EndHint("AUDIO_STREAMING");
                }
            }
            break;
        case PowerHint_1_2::CAMERA_LAUNCH:
            if (data > 0) {
                mHintManager->DoHint("CAMERA_LAUNCH");
            } else if (data == 0) {
                mHintManager->EndHint("CAMERA_LAUNCH");
            } else {
                ALOGE("CAMERA LAUNCH INVALID DATA: %d", data);
            }
            break;
        case PowerHint_1_2::CAMERA_STREAMING: {
            if (data > 0) {
                mHintManager->DoHint("CAMERA_STREAMING");
                mCameraStreamingMode = true;
            } else {
                mHintManager->EndHint("CAMERA_STREAMING");
                mCameraStreamingMode = false;
            }

            const auto prop = mCameraStreamingMode
                                  ? "CAMERA_STREAMING"
                                  : "";
            if (!android::base::SetProperty(kPowerHalStateProp, prop)) {
                ALOGE("%s: could set powerHAL state %s property", __func__, prop);
            }
            break;
        }
        case PowerHint_1_2::CAMERA_SHOT:
            if (data > 0) {
                mHintManager->DoHint("CAMERA_SHOT", std::chrono::milliseconds(data));
            } else if (data == 0) {
                mHintManager->EndHint("CAMERA_SHOT");
            } else {
                ALOGE("CAMERA SHOT INVALID DATA: %d", data);
            }
            break;
        default:
            return powerHint(static_cast<PowerHint_1_0>(hint), data);
    }
    return Void();
}

// Methods from ::android::hardware::power::V1_3::IPower follow.
Return<void> Power::powerHintAsync_1_3(PowerHint_1_3 hint, int32_t data) {
    if (!mReady) {
        return Void();
    }

    switch (static_cast<LineagePowerHint>(hint)) {
        case LineagePowerHint::SET_PROFILE:
            setProfile(static_cast<PowerProfile>(data));
            mCurrentPerfProfile = static_cast<PowerProfile>(data);
            return Void();
        default:
            break;
    }

    if (hint == PowerHint_1_3::EXPENSIVE_RENDERING) {
        ATRACE_INT(android::hardware::power::V1_3::toString(hint).c_str(), data);
        if (mVRModeOn || mSustainedPerfModeOn) {
            ALOGV("%s: ignoring due to other active perf hints", __func__);
        } else {
            if (data > 0) {
                mHintManager->DoHint("EXPENSIVE_RENDERING");
            } else {
                mHintManager->EndHint("EXPENSIVE_RENDERING");
            }
        }
    } else {
        return powerHintAsync_1_2(static_cast<PowerHint_1_2>(hint), data);
    }
    return Void();
}

// Methods from ::vendor::lineage::power::V1_0::ILineagePower follow.
Return<int32_t> Power::getFeature(LineageFeature feature) {
    switch (feature) {
        case LineageFeature::SUPPORTED_PROFILES:
            return mNumPerfProfiles;
        default:
            return -1;
    }
}

constexpr const char *boolToString(bool b) {
    return b ? "true" : "false";
}

Return<void> Power::debug(const hidl_handle &handle, const hidl_vec<hidl_string> &) {
    if (handle != nullptr && handle->numFds >= 1 && mReady) {
        int fd = handle->data[0];

        std::string buf(android::base::StringPrintf(
            "HintManager Running: %s\n"
            "VRMode: %s\n"
            "CameraStreamingMode: %s\n"
            "SustainedPerformanceMode: %s\n",
            boolToString(mHintManager->IsRunning()), boolToString(mVRModeOn),
            boolToString(mCameraStreamingMode),
            boolToString(mSustainedPerfModeOn)));
        // Dump nodes through libperfmgr
        mHintManager->DumpToFd(fd);
        if (!android::base::WriteStringToFd(buf, fd)) {
            PLOG(ERROR) << "Failed to dump state to fd";
        }
        fsync(fd);
    }
    return Void();
}

}  // namespace implementation
}  // namespace V1_3
}  // namespace power
}  // namespace hardware
}  // namespace android