/*
 *
 *    Copyright (c) 2020 Project CHIP Authors
 *
 *    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 "Device.h"
#include "DeviceCallbacks.h"
#include "esp_log.h"
#include "nvs_flash.h"
#include <app-common/zap-generated/af-structs.h>
#include <app-common/zap-generated/attribute-id.h>
#include <app-common/zap-generated/cluster-id.h>
#include <app/ConcreteAttributePath.h>
#include <app/clusters/identify-server/identify-server.h>
#include <app/reporting/reporting.h>
#include <app/util/attribute-storage.h>
#include <common/Esp32AppServer.h>
#include <credentials/DeviceAttestationCredsProvider.h>
#include <credentials/examples/DeviceAttestationCredsExample.h>
#include <lib/core/CHIPError.h>
#include <lib/support/CHIPMem.h>
#include <lib/support/CHIPMemString.h>
#include <lib/support/ErrorStr.h>
#include <lib/support/ZclString.h>

#include <app/InteractionModelEngine.h>
#include <app/server/Server.h>

#if CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER
#include <platform/ESP32/ESP32FactoryDataProvider.h>
#endif // CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER

#if CONFIG_ENABLE_ESP32_DEVICE_INFO_PROVIDER
#include <platform/ESP32/ESP32DeviceInfoProvider.h>
#else
#include <DeviceInfoProviderImpl.h>
#endif // CONFIG_ENABLE_ESP32_DEVICE_INFO_PROVIDER

namespace {
#if CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER
chip::DeviceLayer::ESP32FactoryDataProvider sFactoryDataProvider;
#endif // CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER

#if CONFIG_ENABLE_ESP32_DEVICE_INFO_PROVIDER
chip::DeviceLayer::ESP32DeviceInfoProvider gExampleDeviceInfoProvider;
#else
chip::DeviceLayer::DeviceInfoProviderImpl gExampleDeviceInfoProvider;
#endif // CONFIG_ENABLE_ESP32_DEVICE_INFO_PROVIDER
} // namespace

const char * TAG = "bridge-app";

using namespace ::chip;
using namespace ::chip::DeviceManager;
using namespace ::chip::Platform;
using namespace ::chip::Credentials;
using namespace ::chip::app::Clusters;

static AppDeviceCallbacks AppCallback;

static const int kNodeLabelSize = 32;
// Current ZCL implementation of Struct uses a max-size array of 254 bytes
static const int kDescriptorAttributeArraySize = 254;

static EndpointId gCurrentEndpointId;
static EndpointId gFirstDynamicEndpointId;
static Device * gDevices[CHIP_DEVICE_CONFIG_DYNAMIC_ENDPOINT_COUNT]; // number of dynamic endpoints count

// 4 Bridged devices
static Device gLight1("Light 1", "Office");
static Device gLight2("Light 2", "Office");
static Device gLight3("Light 3", "Kitchen");
static Device gLight4("Light 4", "Den");

// (taken from chip-devices.xml)
#define DEVICE_TYPE_BRIDGED_NODE 0x0013
// (taken from lo-devices.xml)
#define DEVICE_TYPE_LO_ON_OFF_LIGHT 0x0100

// (taken from chip-devices.xml)
#define DEVICE_TYPE_ROOT_NODE 0x0016
// (taken from chip-devices.xml)
#define DEVICE_TYPE_BRIDGE 0x000e

// Device Version for dynamic endpoints:
#define DEVICE_VERSION_DEFAULT 1

/* BRIDGED DEVICE ENDPOINT: contains the following clusters:
   - On/Off
   - Descriptor
   - Bridged Device Basic
*/

// Declare On/Off cluster attributes
DECLARE_DYNAMIC_ATTRIBUTE_LIST_BEGIN(onOffAttrs)
DECLARE_DYNAMIC_ATTRIBUTE(ZCL_ON_OFF_ATTRIBUTE_ID, BOOLEAN, 1, 0), /* on/off */
    DECLARE_DYNAMIC_ATTRIBUTE_LIST_END();

// Declare Descriptor cluster attributes
DECLARE_DYNAMIC_ATTRIBUTE_LIST_BEGIN(descriptorAttrs)
DECLARE_DYNAMIC_ATTRIBUTE(ZCL_DEVICE_LIST_ATTRIBUTE_ID, ARRAY, kDescriptorAttributeArraySize, 0),     /* device list */
    DECLARE_DYNAMIC_ATTRIBUTE(ZCL_SERVER_LIST_ATTRIBUTE_ID, ARRAY, kDescriptorAttributeArraySize, 0), /* server list */
    DECLARE_DYNAMIC_ATTRIBUTE(ZCL_CLIENT_LIST_ATTRIBUTE_ID, ARRAY, kDescriptorAttributeArraySize, 0), /* client list */
    DECLARE_DYNAMIC_ATTRIBUTE(ZCL_PARTS_LIST_ATTRIBUTE_ID, ARRAY, kDescriptorAttributeArraySize, 0),  /* parts list */
    DECLARE_DYNAMIC_ATTRIBUTE_LIST_END();

// Declare Bridged Device Basic information cluster attributes
DECLARE_DYNAMIC_ATTRIBUTE_LIST_BEGIN(bridgedDeviceBasicAttrs)
DECLARE_DYNAMIC_ATTRIBUTE(ZCL_NODE_LABEL_ATTRIBUTE_ID, CHAR_STRING, kNodeLabelSize, 0), /* NodeLabel */
    DECLARE_DYNAMIC_ATTRIBUTE(ZCL_REACHABLE_ATTRIBUTE_ID, BOOLEAN, 1, 0),               /* Reachable */
    DECLARE_DYNAMIC_ATTRIBUTE_LIST_END();

// Declare Cluster List for Bridged Light endpoint
// TODO: It's not clear whether it would be better to get the command lists from
// the ZAP config on our last fixed endpoint instead.
constexpr CommandId onOffIncomingCommands[] = {
    app::Clusters::OnOff::Commands::Off::Id,
    app::Clusters::OnOff::Commands::On::Id,
    app::Clusters::OnOff::Commands::Toggle::Id,
    app::Clusters::OnOff::Commands::OffWithEffect::Id,
    app::Clusters::OnOff::Commands::OnWithRecallGlobalScene::Id,
    app::Clusters::OnOff::Commands::OnWithTimedOff::Id,
    kInvalidCommandId,
};

DECLARE_DYNAMIC_CLUSTER_LIST_BEGIN(bridgedLightClusters)
DECLARE_DYNAMIC_CLUSTER(ZCL_ON_OFF_CLUSTER_ID, onOffAttrs, onOffIncomingCommands, nullptr),
    DECLARE_DYNAMIC_CLUSTER(ZCL_DESCRIPTOR_CLUSTER_ID, descriptorAttrs, nullptr, nullptr),
    DECLARE_DYNAMIC_CLUSTER(ZCL_BRIDGED_DEVICE_BASIC_CLUSTER_ID, bridgedDeviceBasicAttrs, nullptr,
                            nullptr) DECLARE_DYNAMIC_CLUSTER_LIST_END;

// Declare Bridged Light endpoint
DECLARE_DYNAMIC_ENDPOINT(bridgedLightEndpoint, bridgedLightClusters);

DataVersion gLight1DataVersions[ArraySize(bridgedLightClusters)];
DataVersion gLight2DataVersions[ArraySize(bridgedLightClusters)];
DataVersion gLight3DataVersions[ArraySize(bridgedLightClusters)];
DataVersion gLight4DataVersions[ArraySize(bridgedLightClusters)];

/* REVISION definitions:
 */

#define ZCL_DESCRIPTOR_CLUSTER_REVISION (1u)
#define ZCL_BRIDGED_DEVICE_BASIC_CLUSTER_REVISION (1u)
#define ZCL_FIXED_LABEL_CLUSTER_REVISION (1u)
#define ZCL_ON_OFF_CLUSTER_REVISION (4u)

int AddDeviceEndpoint(Device * dev, EmberAfEndpointType * ep, const Span<const EmberAfDeviceType> & deviceTypeList,
                      const Span<DataVersion> & dataVersionStorage)
{
    uint8_t index = 0;
    while (index < CHIP_DEVICE_CONFIG_DYNAMIC_ENDPOINT_COUNT)
    {
        if (NULL == gDevices[index])
        {
            gDevices[index] = dev;
            EmberAfStatus ret;
            while (1)
            {
                dev->SetEndpointId(gCurrentEndpointId);
                ret = emberAfSetDynamicEndpoint(index, gCurrentEndpointId, ep, dataVersionStorage, deviceTypeList);
                if (ret == EMBER_ZCL_STATUS_SUCCESS)
                {
                    ChipLogProgress(DeviceLayer, "Added device %s to dynamic endpoint %d (index=%d)", dev->GetName(),
                                    gCurrentEndpointId, index);
                    return index;
                }
                else if (ret != EMBER_ZCL_STATUS_DUPLICATE_EXISTS)
                {
                    return -1;
                }
                // Handle wrap condition
                if (++gCurrentEndpointId < gFirstDynamicEndpointId)
                {
                    gCurrentEndpointId = gFirstDynamicEndpointId;
                }
            }
        }
        index++;
    }
    ChipLogProgress(DeviceLayer, "Failed to add dynamic endpoint: No endpoints available!");
    return -1;
}

CHIP_ERROR RemoveDeviceEndpoint(Device * dev)
{
    for (uint8_t index = 0; index < CHIP_DEVICE_CONFIG_DYNAMIC_ENDPOINT_COUNT; index++)
    {
        if (gDevices[index] == dev)
        {
            EndpointId ep   = emberAfClearDynamicEndpoint(index);
            gDevices[index] = NULL;
            ChipLogProgress(DeviceLayer, "Removed device %s from dynamic endpoint %d (index=%d)", dev->GetName(), ep, index);
            // Silence complaints about unused ep when progress logging
            // disabled.
            UNUSED_VAR(ep);
            return CHIP_NO_ERROR;
        }
    }
    return CHIP_ERROR_INTERNAL;
}

EmberAfStatus HandleReadBridgedDeviceBasicAttribute(Device * dev, chip::AttributeId attributeId, uint8_t * buffer,
                                                    uint16_t maxReadLength)
{
    ChipLogProgress(DeviceLayer, "HandleReadBridgedDeviceBasicAttribute: attrId=%d, maxReadLength=%d", attributeId, maxReadLength);

    if ((attributeId == ZCL_REACHABLE_ATTRIBUTE_ID) && (maxReadLength == 1))
    {
        *buffer = dev->IsReachable() ? 1 : 0;
    }
    else if ((attributeId == ZCL_NODE_LABEL_ATTRIBUTE_ID) && (maxReadLength == 32))
    {
        MutableByteSpan zclNameSpan(buffer, maxReadLength);
        MakeZclCharString(zclNameSpan, dev->GetName());
    }
    else if ((attributeId == ZCL_CLUSTER_REVISION_SERVER_ATTRIBUTE_ID) && (maxReadLength == 2))
    {
        *buffer = (uint16_t) ZCL_BRIDGED_DEVICE_BASIC_CLUSTER_REVISION;
    }
    else
    {
        return EMBER_ZCL_STATUS_FAILURE;
    }

    return EMBER_ZCL_STATUS_SUCCESS;
}

EmberAfStatus HandleReadOnOffAttribute(Device * dev, chip::AttributeId attributeId, uint8_t * buffer, uint16_t maxReadLength)
{
    ChipLogProgress(DeviceLayer, "HandleReadOnOffAttribute: attrId=%d, maxReadLength=%d", attributeId, maxReadLength);

    if ((attributeId == ZCL_ON_OFF_ATTRIBUTE_ID) && (maxReadLength == 1))
    {
        *buffer = dev->IsOn() ? 1 : 0;
    }
    else if ((attributeId == ZCL_CLUSTER_REVISION_SERVER_ATTRIBUTE_ID) && (maxReadLength == 2))
    {
        *buffer = (uint16_t) ZCL_ON_OFF_CLUSTER_REVISION;
    }
    else
    {
        return EMBER_ZCL_STATUS_FAILURE;
    }

    return EMBER_ZCL_STATUS_SUCCESS;
}

EmberAfStatus HandleWriteOnOffAttribute(Device * dev, chip::AttributeId attributeId, uint8_t * buffer)
{
    ChipLogProgress(DeviceLayer, "HandleWriteOnOffAttribute: attrId=%d", attributeId);

    ReturnErrorCodeIf((attributeId != ZCL_ON_OFF_ATTRIBUTE_ID) || (!dev->IsReachable()), EMBER_ZCL_STATUS_FAILURE);
    dev->SetOnOff(*buffer == 1);
    return EMBER_ZCL_STATUS_SUCCESS;
}

EmberAfStatus emberAfExternalAttributeReadCallback(EndpointId endpoint, ClusterId clusterId,
                                                   const EmberAfAttributeMetadata * attributeMetadata, uint8_t * buffer,
                                                   uint16_t maxReadLength)
{
    uint16_t endpointIndex = emberAfGetDynamicIndexFromEndpoint(endpoint);

    if ((endpointIndex < CHIP_DEVICE_CONFIG_DYNAMIC_ENDPOINT_COUNT) && (gDevices[endpointIndex] != NULL))
    {
        Device * dev = gDevices[endpointIndex];

        if (clusterId == ZCL_BRIDGED_DEVICE_BASIC_CLUSTER_ID)
        {
            return HandleReadBridgedDeviceBasicAttribute(dev, attributeMetadata->attributeId, buffer, maxReadLength);
        }
        else if (clusterId == ZCL_ON_OFF_CLUSTER_ID)
        {
            return HandleReadOnOffAttribute(dev, attributeMetadata->attributeId, buffer, maxReadLength);
        }
    }

    return EMBER_ZCL_STATUS_FAILURE;
}

EmberAfStatus emberAfExternalAttributeWriteCallback(EndpointId endpoint, ClusterId clusterId,
                                                    const EmberAfAttributeMetadata * attributeMetadata, uint8_t * buffer)
{
    uint16_t endpointIndex = emberAfGetDynamicIndexFromEndpoint(endpoint);

    if (endpointIndex < CHIP_DEVICE_CONFIG_DYNAMIC_ENDPOINT_COUNT)
    {
        Device * dev = gDevices[endpointIndex];

        if ((dev->IsReachable()) && (clusterId == ZCL_ON_OFF_CLUSTER_ID))
        {
            return HandleWriteOnOffAttribute(dev, attributeMetadata->attributeId, buffer);
        }
    }

    return EMBER_ZCL_STATUS_FAILURE;
}

namespace {
void CallReportingCallback(intptr_t closure)
{
    auto path = reinterpret_cast<app::ConcreteAttributePath *>(closure);
    MatterReportingAttributeChangeCallback(*path);
    Platform::Delete(path);
}

void ScheduleReportingCallback(Device * dev, ClusterId cluster, AttributeId attribute)
{
    auto * path = Platform::New<app::ConcreteAttributePath>(dev->GetEndpointId(), cluster, attribute);
    DeviceLayer::PlatformMgr().ScheduleWork(CallReportingCallback, reinterpret_cast<intptr_t>(path));
}
} // anonymous namespace

void HandleDeviceStatusChanged(Device * dev, Device::Changed_t itemChangedMask)
{
    if (itemChangedMask & Device::kChanged_Reachable)
    {
        ScheduleReportingCallback(dev, BridgedDeviceBasic::Id, BridgedDeviceBasic::Attributes::Reachable::Id);
    }

    if (itemChangedMask & Device::kChanged_State)
    {
        ScheduleReportingCallback(dev, OnOff::Id, OnOff::Attributes::OnOff::Id);
    }

    if (itemChangedMask & Device::kChanged_Name)
    {
        ScheduleReportingCallback(dev, BridgedDeviceBasic::Id, BridgedDeviceBasic::Attributes::NodeLabel::Id);
    }
}

bool emberAfActionsClusterInstantActionCallback(app::CommandHandler * commandObj, const app::ConcreteCommandPath & commandPath,
                                                const Actions::Commands::InstantAction::DecodableType & commandData)
{
    // No actions are implemented, just return status NotFound.
    commandObj->AddStatus(commandPath, Protocols::InteractionModel::Status::NotFound);
    return true;
}

const EmberAfDeviceType gBridgedRootDeviceTypes[] = { { DEVICE_TYPE_ROOT_NODE, DEVICE_VERSION_DEFAULT },
                                                      { DEVICE_TYPE_BRIDGE, DEVICE_VERSION_DEFAULT } };

const EmberAfDeviceType gBridgedOnOffDeviceTypes[] = { { DEVICE_TYPE_LO_ON_OFF_LIGHT, DEVICE_VERSION_DEFAULT },
                                                       { DEVICE_TYPE_BRIDGED_NODE, DEVICE_VERSION_DEFAULT } };

static void InitServer(intptr_t context)
{
    Esp32AppServer::Init(); // Init ZCL Data Model and CHIP App Server AND Initialize device attestation config

    // Set starting endpoint id where dynamic endpoints will be assigned, which
    // will be the next consecutive endpoint id after the last fixed endpoint.
    gFirstDynamicEndpointId = static_cast<chip::EndpointId>(
        static_cast<int>(emberAfEndpointFromIndex(static_cast<uint16_t>(emberAfFixedEndpointCount() - 1))) + 1);
    gCurrentEndpointId = gFirstDynamicEndpointId;

    // Disable last fixed endpoint, which is used as a placeholder for all of the
    // supported clusters so that ZAP will generated the requisite code.
    emberAfEndpointEnableDisable(emberAfEndpointFromIndex(static_cast<uint16_t>(emberAfFixedEndpointCount() - 1)), false);

    //
    // By default, ZAP only supports specifying a single device type in the UI. However for bridges, they are both
    // a Bridge and Matter Root Node device on EP0. Consequently, over-ride the generated value to correct this.
    //
    emberAfSetDeviceTypeList(0, Span<const EmberAfDeviceType>(gBridgedRootDeviceTypes));

    // Add lights 1..3 --> will be mapped to ZCL endpoints 2, 3, 4
    AddDeviceEndpoint(&gLight1, &bridgedLightEndpoint, Span<const EmberAfDeviceType>(gBridgedOnOffDeviceTypes),
                      Span<DataVersion>(gLight1DataVersions));
    AddDeviceEndpoint(&gLight2, &bridgedLightEndpoint, Span<const EmberAfDeviceType>(gBridgedOnOffDeviceTypes),
                      Span<DataVersion>(gLight2DataVersions));
    AddDeviceEndpoint(&gLight3, &bridgedLightEndpoint, Span<const EmberAfDeviceType>(gBridgedOnOffDeviceTypes),
                      Span<DataVersion>(gLight3DataVersions));

    // Remove Light 2 -- Lights 1 & 3 will remain mapped to endpoints 2 & 4
    RemoveDeviceEndpoint(&gLight2);

    // Add Light 4 -- > will be mapped to ZCL endpoint 5
    AddDeviceEndpoint(&gLight4, &bridgedLightEndpoint, Span<const EmberAfDeviceType>(gBridgedOnOffDeviceTypes),
                      Span<DataVersion>(gLight4DataVersions));

    // Re-add Light 2 -- > will be mapped to ZCL endpoint 6
    AddDeviceEndpoint(&gLight2, &bridgedLightEndpoint, Span<const EmberAfDeviceType>(gBridgedOnOffDeviceTypes),
                      Span<DataVersion>(gLight2DataVersions));
}

extern "C" void app_main()
{
    // Initialize the ESP NVS layer.
    esp_err_t err = nvs_flash_init();
    if (err != ESP_OK)
    {
        ESP_LOGE(TAG, "nvs_flash_init() failed: %s", esp_err_to_name(err));
        return;
    }

    CHIP_ERROR chip_err = CHIP_NO_ERROR;

    // bridge will have own database named gDevices.
    // Clear database
    memset(gDevices, 0, sizeof(gDevices));

    gLight1.SetReachable(true);
    gLight2.SetReachable(true);
    gLight3.SetReachable(true);
    gLight4.SetReachable(true);

    // Whenever bridged device changes its state
    gLight1.SetChangeCallback(&HandleDeviceStatusChanged);
    gLight2.SetChangeCallback(&HandleDeviceStatusChanged);
    gLight3.SetChangeCallback(&HandleDeviceStatusChanged);
    gLight4.SetChangeCallback(&HandleDeviceStatusChanged);

    DeviceLayer::SetDeviceInfoProvider(&gExampleDeviceInfoProvider);

    CHIPDeviceManager & deviceMgr = CHIPDeviceManager::GetInstance();

    chip_err = deviceMgr.Init(&AppCallback);
    if (chip_err != CHIP_NO_ERROR)
    {
        ESP_LOGE(TAG, "device.Init() failed: %s", ErrorStr(chip_err));
        return;
    }

#if CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER
    SetCommissionableDataProvider(&sFactoryDataProvider);
    SetDeviceAttestationCredentialsProvider(&sFactoryDataProvider);
#if CONFIG_ENABLE_ESP32_DEVICE_INSTANCE_INFO_PROVIDER
    SetDeviceInstanceInfoProvider(&sFactoryDataProvider);
#endif
#else
    SetDeviceAttestationCredentialsProvider(Examples::GetExampleDACProvider());
#endif // CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER

    chip::DeviceLayer::PlatformMgr().ScheduleWork(InitServer, reinterpret_cast<intptr_t>(nullptr));
}