#pragma once

#include <cstdint>
#include <array>

#include <host/ble_gap.h>

namespace Pinetime {
  namespace System {
    class SystemTask;
  }
  namespace Drivers {
    class SpiNorFlash;
  }
  namespace Controllers {
    class Ble;

    class DfuService {
      public:
        DfuService(Pinetime::System::SystemTask &systemTask, Pinetime::Controllers::Ble &bleController,
                   Pinetime::Drivers::SpiNorFlash &spiNorFlash);

        void Init();

        bool Validate();

        int OnServiceData(uint16_t connectionHandle, uint16_t attributeHandle, ble_gatt_access_ctxt *context);
        void OnNotificationTimer();
        void OnTimeout();

        void Reset();

      private:
        Pinetime::System::SystemTask &systemTask;
        Pinetime::Controllers::Ble &bleController;
        Pinetime::Drivers::SpiNorFlash &spiNorFlash;

        static constexpr uint16_t dfuServiceId{0x1530};
        static constexpr uint16_t packetCharacteristicId{0x1532};
        static constexpr uint16_t controlPointCharacteristicId{0x1531};
        static constexpr uint16_t revisionCharacteristicId{0x1534};

        uint16_t revision{0x0008};

        static constexpr ble_uuid128_t serviceUuid{
                .u {.type = BLE_UUID_TYPE_128},
                .value = {0x23, 0xD1, 0xBC, 0xEA, 0x5F, 0x78, 0x23, 0x15,
                          0xDE, 0xEF, 0x12, 0x12, 0x30, 0x15, 0x00, 0x00}
        };

        static constexpr ble_uuid128_t packetCharacteristicUuid{
                .u {.type = BLE_UUID_TYPE_128},
                .value = {0x23, 0xD1, 0xBC, 0xEA, 0x5F, 0x78, 0x23, 0x15,
                          0xDE, 0xEF, 0x12, 0x12, 0x32, 0x15, 0x00, 0x00}
        };

        static constexpr ble_uuid128_t controlPointCharacteristicUuid{
                .u {.type = BLE_UUID_TYPE_128},
                .value = {0x23, 0xD1, 0xBC, 0xEA, 0x5F, 0x78, 0x23, 0x15,
                          0xDE, 0xEF, 0x12, 0x12, 0x31, 0x15, 0x00, 0x00}
        };

        static constexpr ble_uuid128_t revisionCharacteristicUuid{
                .u {.type = BLE_UUID_TYPE_128},
                .value = {0x23, 0xD1, 0xBC, 0xEA, 0x5F, 0x78, 0x23, 0x15,
                          0xDE, 0xEF, 0x12, 0x12, 0x34, 0x15, 0x00, 0x00}
        };

        struct ble_gatt_chr_def characteristicDefinition[4];
        struct ble_gatt_svc_def serviceDefinition[2];
        uint16_t packetCharacteristicHandle;
        uint16_t controlPointCharacteristicHandle;
        uint16_t revisionCharacteristicHandle;

        enum class States : uint8_t {
            Idle, Init, Start, Data, Validate, Validated
        };
        States state = States::Idle;

        enum class ImageTypes : uint8_t {
            NoImage = 0x00,
            SoftDevice = 0x01,
            Bootloader = 0x02,
            SoftDeviceAndBootloader = 0x03,
            Application = 0x04
        };

        enum class Opcodes : uint8_t {
            StartDFU = 0x01,
            InitDFUParameters = 0x02,
            ReceiveFirmwareImage = 0x03,
            ValidateFirmware = 0x04,
            ActivateImageAndReset = 0x05,
            PacketReceiptNotificationRequest = 0x08,
            Response = 0x10,
            PacketReceiptNotification = 0x11
        };

        enum class ErrorCodes {
            NoError = 0x01,
            InvalidState = 0x02,
            NotSupported = 0x03,
            DataSizeExceedsLimits = 0x04,
            CrcError = 0x05,
            OperationFailed = 0x06
        };

        uint8_t nbPacketsToNotify = 0;
        uint32_t nbPacketReceived = 0;
        uint32_t bytesReceived = 0;
        uint32_t writeOffset = 0x40000;

        uint32_t softdeviceSize = 0;
        uint32_t bootloaderSize = 0;
        uint32_t applicationSize = 0;
        static constexpr uint32_t maxImageSize = 475136;
        uint16_t expectedCrc = 0;

        int SendDfuRevision(os_mbuf *om) const;

        void SendNotification(uint16_t connectionHandle, const uint8_t *data, const size_t size);

        int WritePacketHandler(uint16_t connectionHandle, os_mbuf *om);

        int ControlPointHandler(uint16_t connectionHandle, os_mbuf *om);

        uint8_t tempBuffer[200];

        uint16_t ComputeCrc(uint8_t const *p_data, uint32_t size, uint16_t const *p_crc);

        void WriteMagicNumber();
        TimerHandle_t notificationTimer;
        TimerHandle_t timeoutTimer;

        uint16_t notificatonConnectionHandle = 0;
        size_t notificationSize = 0;
        uint8_t notificationBuffer[10];
    };
  }
}