/*
 * CANopen LSS Slave protocol.
 *
 * @file        CO_LSSslave.c
 * @ingroup     CO_LSS
 * @author      Martin Wagner
 * @author      Janez Paternoster
 * @copyright   2017 - 2020 Neuberger Gebaeudeautomation GmbH
 *
 *
 * This file is part of <https://github.com/CANopenNode/CANopenNode>, a CANopen Stack.
 *
 * 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 <string.h>

#include "305/CO_LSSslave.h"

#if ((CO_CONFIG_LSS)&CO_CONFIG_LSS_SLAVE) != 0

/* 'bit' must be unsigned or additional range check must be added: bit>=CO_LSS_FASTSCAN_BIT0 */
#define CO_LSS_FASTSCAN_BITCHECK_VALID(bit)       ((bit <= CO_LSS_FASTSCAN_BIT31) || (bit == CO_LSS_FASTSCAN_CONFIRM))
/* 'index' must be unsigned or additional range check must be added: index>=CO_LSS_FASTSCAN_VENDOR_ID */
#define CO_LSS_FASTSCAN_LSS_SUB_NEXT_VALID(index) (index <= CO_LSS_FASTSCAN_SERIAL)
/* 'index' must be unsigned or additional range check must be added: index>=CO_LSS_BIT_TIMING_1000 */
#define CO_LSS_BIT_TIMING_VALID(index)            ((index != 5U) && (index <= CO_LSS_BIT_TIMING_AUTO))

/*
 * Read received message from CAN module.
 *
 * Function will be called (by CAN receive interrupt) every time, when CAN message with correct identifier
 * will be received. For more information and description of parameters see file CO_driver.h.
 */
static void
CO_LSSslave_receive(void* object, void* msg) {
    CO_LSSslave_t* LSSslave = (CO_LSSslave_t*)object;
    uint8_t DLC = CO_CANrxMsg_readDLC(msg);

    if ((DLC == 8U) && !CO_FLAG_READ(LSSslave->sendResponse)) {
        bool_t request_LSSslave_process = false;
        const uint8_t* data = CO_CANrxMsg_readData(msg);
        uint8_t cs = data[0];

        if (cs == CO_LSS_SWITCH_STATE_GLOBAL) {
            uint8_t mode = data[1];

            switch (mode) {
                case CO_LSS_STATE_WAITING:
                    if ((LSSslave->lssState == CO_LSS_STATE_CONFIGURATION)
                        && (LSSslave->activeNodeID == CO_LSS_NODE_ID_ASSIGNMENT)
                        && (*LSSslave->pendingNodeID != CO_LSS_NODE_ID_ASSIGNMENT)) {
                        /* Slave process function will request NMT Reset comm. */
                        LSSslave->service = cs;
                        request_LSSslave_process = true;
                    }
                    LSSslave->lssState = CO_LSS_STATE_WAITING;
                    (void)memset(&LSSslave->lssSelect, 0, sizeof(LSSslave->lssSelect));
                    break;
                case CO_LSS_STATE_CONFIGURATION: LSSslave->lssState = CO_LSS_STATE_CONFIGURATION; break;
                default:
                    /* none */
                    break;
            }
        } else if (LSSslave->lssState == CO_LSS_STATE_WAITING) {
            switch (cs) {
                case CO_LSS_SWITCH_STATE_SEL_VENDOR: {
                    uint32_t valSw;
                    (void)memcpy((void*)(&valSw), (const void*)(&data[1]), sizeof(valSw));
                    LSSslave->lssSelect.identity.vendorID = CO_SWAP_32(valSw);
                    break;
                }
                case CO_LSS_SWITCH_STATE_SEL_PRODUCT: {
                    uint32_t valSw;
                    (void)memcpy((void*)(&valSw), (const void*)(&data[1]), sizeof(valSw));
                    LSSslave->lssSelect.identity.productCode = CO_SWAP_32(valSw);
                    break;
                }
                case CO_LSS_SWITCH_STATE_SEL_REV: {
                    uint32_t valSw;
                    (void)memcpy((void*)(&valSw), (const void*)(&data[1]), sizeof(valSw));
                    LSSslave->lssSelect.identity.revisionNumber = CO_SWAP_32(valSw);
                    break;
                }
                case CO_LSS_SWITCH_STATE_SEL_SERIAL: {
                    uint32_t valSw;
                    (void)memcpy((void*)(&valSw), (const void*)(&data[1]), sizeof(valSw));
                    LSSslave->lssSelect.identity.serialNumber = CO_SWAP_32(valSw);

                    if (CO_LSS_ADDRESS_EQUAL(LSSslave->lssAddress, LSSslave->lssSelect)) {
                        LSSslave->lssState = CO_LSS_STATE_CONFIGURATION;
                        LSSslave->service = cs;
                        request_LSSslave_process = true;
                    }
                    break;
                }
                case CO_LSS_IDENT_FASTSCAN: {
                    /* fastscan is only active on unconfigured nodes */
                    if ((*LSSslave->pendingNodeID == CO_LSS_NODE_ID_ASSIGNMENT)
                        && (LSSslave->activeNodeID == CO_LSS_NODE_ID_ASSIGNMENT)) {
                        uint8_t bitCheck = data[5];
                        uint8_t lssSub = data[6];
                        uint8_t lssNext = data[7];
                        uint32_t valSw;
                        uint32_t idNumber;
                        bool_t ack;

                        if (!CO_LSS_FASTSCAN_BITCHECK_VALID(bitCheck) || !CO_LSS_FASTSCAN_LSS_SUB_NEXT_VALID(lssSub)
                            || !CO_LSS_FASTSCAN_LSS_SUB_NEXT_VALID(lssNext)) {
                            /* Invalid request */
                            break;
                        }

                        (void)memcpy((void*)(&valSw), (const void*)(&data[1]), sizeof(valSw));
                        idNumber = CO_SWAP_32(valSw);
                        ack = false;

                        if (bitCheck == CO_LSS_FASTSCAN_CONFIRM) {
                            /* Confirm, Reset */
                            ack = true;
                            LSSslave->fastscanPos = CO_LSS_FASTSCAN_VENDOR_ID;
                            (void)memset(&LSSslave->lssFastscan, 0, sizeof(LSSslave->lssFastscan));
                        } else if (LSSslave->fastscanPos == lssSub) {
                            uint32_t mask = 0xFFFFFFFFU << bitCheck;

                            if ((LSSslave->lssAddress.addr[lssSub] & mask) == (idNumber & mask)) {
                                /* all requested bits match */
                                ack = true;
                                LSSslave->fastscanPos = lssNext;

                                if ((bitCheck == 0U) && (lssNext < lssSub)) {
                                    /* complete match, enter configuration state */
                                    LSSslave->lssState = CO_LSS_STATE_CONFIGURATION;
                                }
                            }
                        } else { /* MISRA C 2004 14.10 */
                        }
                        if (ack) {
#if ((CO_CONFIG_LSS)&CO_CONFIG_LSS_SLAVE_FASTSCAN_DIRECT_RESPOND) != 0
                            LSSslave->TXbuff->data[0] = CO_LSS_IDENT_SLAVE;
                            (void)memset(&LSSslave->TXbuff->data[1], 0, sizeof(LSSslave->TXbuff->data) - 1U);
                            (void)CO_CANsend(LSSslave->CANdevTx, LSSslave->TXbuff);
#else
                            LSSslave->service = cs;
                            request_LSSslave_process = true;
#endif
                        }
                    }
                    break;
                }
                default: {
                    /* none */
                    break;
                }
            }
        } else { /* LSSslave->lssState == CO_LSS_STATE_CONFIGURATION */
            (void)memcpy((void*)(&LSSslave->CANdata[0]), (const void*)(&data[0]), sizeof(LSSslave->CANdata));
            LSSslave->service = cs;
            request_LSSslave_process = true;
        }

        if (request_LSSslave_process) {
            CO_FLAG_SET(LSSslave->sendResponse);
#if ((CO_CONFIG_LSS)&CO_CONFIG_FLAG_CALLBACK_PRE) != 0
            /* Optional signal to RTOS, which can resume task, which handles further processing. */
            if (LSSslave->pFunctSignalPre != NULL) {
                LSSslave->pFunctSignalPre(LSSslave->functSignalObjectPre);
            }
#endif
        }
    }
}

CO_ReturnError_t
CO_LSSslave_init(CO_LSSslave_t* LSSslave, CO_LSS_address_t* lssAddress, uint16_t* pendingBitRate,
                 uint8_t* pendingNodeID, CO_CANmodule_t* CANdevRx, uint16_t CANdevRxIdx, uint16_t CANidLssMaster,
                 CO_CANmodule_t* CANdevTx, uint16_t CANdevTxIdx, uint16_t CANidLssSlave) {
    CO_ReturnError_t ret = CO_ERROR_NO;

    /* verify arguments */
    if ((LSSslave == NULL) || (pendingBitRate == NULL) || (pendingNodeID == NULL) || (CANdevRx == NULL)
        || (CANdevTx == NULL) || !CO_LSS_NODE_ID_VALID(*pendingNodeID)) {
        return CO_ERROR_ILLEGAL_ARGUMENT;
    }

    /* Application must make sure that lssAddress is filled with data. */

    /* clear the object */
    (void)memset(LSSslave, 0, sizeof(CO_LSSslave_t));

    /* Configure object variables */
    (void)memcpy(&LSSslave->lssAddress, lssAddress, sizeof(LSSslave->lssAddress));
    LSSslave->lssState = CO_LSS_STATE_WAITING;
    LSSslave->fastscanPos = CO_LSS_FASTSCAN_VENDOR_ID;

    LSSslave->pendingBitRate = pendingBitRate;
    LSSslave->pendingNodeID = pendingNodeID;
    LSSslave->activeNodeID = *pendingNodeID;
    CO_FLAG_CLEAR(LSSslave->sendResponse);

    /* configure LSS CAN Master message reception */
    ret = CO_CANrxBufferInit(CANdevRx, CANdevRxIdx, CANidLssMaster, 0x7FF, false, (void*)LSSslave, CO_LSSslave_receive);

    /* configure LSS CAN Slave response message transmission */
    LSSslave->CANdevTx = CANdevTx;
    LSSslave->TXbuff = CO_CANtxBufferInit(CANdevTx, CANdevTxIdx, CANidLssSlave, false, 8, false);

    if (LSSslave->TXbuff == NULL) {
        ret = CO_ERROR_ILLEGAL_ARGUMENT;
    }

    return ret;
}

#if ((CO_CONFIG_LSS)&CO_CONFIG_FLAG_CALLBACK_PRE) != 0
void
CO_LSSslave_initCallbackPre(CO_LSSslave_t* LSSslave, void* object, void (*pFunctSignalPre)(void* object)) {
    if (LSSslave != NULL) {
        LSSslave->functSignalObjectPre = object;
        LSSslave->pFunctSignalPre = pFunctSignalPre;
    }
}
#endif

void
CO_LSSslave_initCkBitRateCall(CO_LSSslave_t* LSSslave, void* object,
                              bool_t (*pFunctLSScheckBitRate)(void* object, uint16_t bitRate)) {
    if (LSSslave != NULL) {
        LSSslave->functLSScheckBitRateObject = object;
        LSSslave->pFunctLSScheckBitRate = pFunctLSScheckBitRate;
    }
}

void
CO_LSSslave_initActBitRateCall(CO_LSSslave_t* LSSslave, void* object,
                               void (*pFunctLSSactivateBitRate)(void* object, uint16_t delay)) {
    if (LSSslave != NULL) {
        LSSslave->functLSSactivateBitRateObject = object;
        LSSslave->pFunctLSSactivateBitRate = pFunctLSSactivateBitRate;
    }
}

void
CO_LSSslave_initCfgStoreCall(CO_LSSslave_t* LSSslave, void* object,
                             bool_t (*pFunctLSScfgStore)(void* object, uint8_t id, uint16_t bitRate)) {
    if (LSSslave != NULL) {
        LSSslave->functLSScfgStoreObject = object;
        LSSslave->pFunctLSScfgStore = pFunctLSScfgStore;
    }
}

bool_t
CO_LSSslave_process(CO_LSSslave_t* LSSslave) {
    bool_t resetCommunication = false;

    if (CO_FLAG_READ(LSSslave->sendResponse)) {
        uint8_t nid;
        uint8_t errorCode;
        uint8_t errorCodeManuf;
        uint8_t tableSelector;
        uint8_t tableIndex;
        bool_t CANsend = false;
        uint32_t valSw;

        (void)memset(&LSSslave->TXbuff->data[0], 0, sizeof(LSSslave->TXbuff->data));

        switch (LSSslave->service) {
            case CO_LSS_SWITCH_STATE_GLOBAL: {
                /* Node-Id was unconfigured before, now it is configured,
                 * enter the NMT Reset communication autonomously. */
                resetCommunication = true;
                break;
            }
            case CO_LSS_SWITCH_STATE_SEL_SERIAL: {
                LSSslave->TXbuff->data[0] = CO_LSS_SWITCH_STATE_SEL;
                CANsend = true;
                break;
            }
            case CO_LSS_CFG_NODE_ID: {
                nid = LSSslave->CANdata[1];
                errorCode = CO_LSS_CFG_NODE_ID_OK;

                if (CO_LSS_NODE_ID_VALID(nid)) {
                    *LSSslave->pendingNodeID = nid;
                } else {
                    errorCode = CO_LSS_CFG_NODE_ID_OUT_OF_RANGE;
                }

                /* send confirmation */
                LSSslave->TXbuff->data[0] = LSSslave->service;
                LSSslave->TXbuff->data[1] = errorCode;
                /* we do not use spec-error, always 0 */
                CANsend = true;
                break;
            }
            case CO_LSS_CFG_BIT_TIMING: {
                if (LSSslave->pFunctLSScheckBitRate == NULL) {
                    /* setting bit timing is not supported. Drop request */
                    break;
                }

                tableSelector = LSSslave->CANdata[1];
                tableIndex = LSSslave->CANdata[2];
                errorCode = CO_LSS_CFG_BIT_TIMING_OK;
                errorCodeManuf = CO_LSS_CFG_BIT_TIMING_OK;

                if ((tableSelector == 0U) && CO_LSS_BIT_TIMING_VALID(tableIndex)) {
                    uint16_t bit = CO_LSS_bitTimingTableLookup[tableIndex];
                    bool_t bit_rate_supported = LSSslave->pFunctLSScheckBitRate(LSSslave->functLSScheckBitRateObject,
                                                                                bit);

                    if (bit_rate_supported) {
                        *LSSslave->pendingBitRate = bit;
                    } else {
                        errorCode = CO_LSS_CFG_BIT_TIMING_MANUFACTURER;
                        errorCodeManuf = CO_LSS_CFG_BIT_TIMING_OUT_OF_RANGE;
                    }
                } else {
                    /* we currently only support CiA301 bit timing table */
                    errorCode = CO_LSS_CFG_BIT_TIMING_OUT_OF_RANGE;
                }

                /* send confirmation */
                LSSslave->TXbuff->data[0] = LSSslave->service;
                LSSslave->TXbuff->data[1] = errorCode;
                LSSslave->TXbuff->data[2] = errorCodeManuf;
                CANsend = true;
                break;
            }
            case CO_LSS_CFG_ACTIVATE_BIT_TIMING: {
                if (LSSslave->pFunctLSScheckBitRate == NULL) {
                    /* setting bit timing is not supported. Drop request */
                    break;
                }

                /* notify application */
                if (LSSslave->pFunctLSSactivateBitRate != NULL) {
                    uint16_t delay = ((uint16_t)LSSslave->CANdata[2]) << 8;
                    delay |= LSSslave->CANdata[1];
                    LSSslave->pFunctLSSactivateBitRate(LSSslave->functLSSactivateBitRateObject, delay);
                }
                break;
            }
            case CO_LSS_CFG_STORE: {
                errorCode = CO_LSS_CFG_STORE_OK;

                if (LSSslave->pFunctLSScfgStore == NULL) {
                    /* storing is not supported. Reply error */
                    errorCode = CO_LSS_CFG_STORE_NOT_SUPPORTED;
                } else {
                    bool_t result;
                    /* Store "pending" to "persistent" */
                    result = LSSslave->pFunctLSScfgStore(LSSslave->functLSScfgStoreObject, *LSSslave->pendingNodeID,
                                                         *LSSslave->pendingBitRate);
                    if (!result) {
                        errorCode = CO_LSS_CFG_STORE_FAILED;
                    }
                }

                /* send confirmation */
                LSSslave->TXbuff->data[0] = LSSslave->service;
                LSSslave->TXbuff->data[1] = errorCode;
                /* we do not use spec-error, always 0 */
                CANsend = true;
                break;
            }
            case CO_LSS_INQUIRE_VENDOR: {
                LSSslave->TXbuff->data[0] = LSSslave->service;
                valSw = CO_SWAP_32(LSSslave->lssAddress.identity.vendorID);
                (void)memcpy((void*)(&LSSslave->TXbuff->data[1]), (const void*)(&valSw), sizeof(valSw));
                CANsend = true;
                break;
            }
            case CO_LSS_INQUIRE_PRODUCT: {
                LSSslave->TXbuff->data[0] = LSSslave->service;
                valSw = CO_SWAP_32(LSSslave->lssAddress.identity.productCode);
                (void)memcpy((void*)(&LSSslave->TXbuff->data[1]), (const void*)(&valSw), sizeof(valSw));
                CANsend = true;
                break;
            }
            case CO_LSS_INQUIRE_REV: {
                LSSslave->TXbuff->data[0] = LSSslave->service;
                valSw = CO_SWAP_32(LSSslave->lssAddress.identity.revisionNumber);
                (void)memcpy((void*)(&LSSslave->TXbuff->data[1]), (const void*)(&valSw), sizeof(valSw));
                CANsend = true;
                break;
            }
            case CO_LSS_INQUIRE_SERIAL: {
                LSSslave->TXbuff->data[0] = LSSslave->service;
                valSw = CO_SWAP_32(LSSslave->lssAddress.identity.serialNumber);
                (void)memcpy((void*)(&LSSslave->TXbuff->data[1]), (const void*)(&valSw), sizeof(valSw));
                CANsend = true;
                break;
            }
            case CO_LSS_INQUIRE_NODE_ID: {
                LSSslave->TXbuff->data[0] = LSSslave->service;
                LSSslave->TXbuff->data[1] = LSSslave->activeNodeID;
                CANsend = true;
                break;
            }
            case CO_LSS_IDENT_FASTSCAN: {
                LSSslave->TXbuff->data[0] = CO_LSS_IDENT_SLAVE;
                CANsend = true;
                break;
            }
            default: {
                /* none */
                break;
            }
        }

        if (CANsend) {
            (void)CO_CANsend(LSSslave->CANdevTx, LSSslave->TXbuff);
        }

        CO_FLAG_CLEAR(LSSslave->sendResponse);
    }

    return resetCommunication;
}

#endif /* (CO_CONFIG_LSS) & CO_CONFIG_LSS_SLAVE */