/**************************************************************************
*
* Copyright (C) 2015 Nikola Jelic <nikola.jelic@euroicc.com>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*********************************************************************/

/* Access User Objects - customize for your use */

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "bacdef.h"
#include "bacdcode.h"
#include "bacenum.h"
#include "bacapp.h"
#include "config.h"     /* the custom stuff */
#include "wp.h"
#include "access_user.h"
#include "handlers.h"

static bool Access_User_Initialized = false;

static ACCESS_USER_DESCR au_descr[MAX_ACCESS_USERS];

/* These three arrays are used by the ReadPropertyMultiple handler */
static const int Properties_Required[] = {
    PROP_OBJECT_IDENTIFIER,
    PROP_OBJECT_NAME,
    PROP_OBJECT_TYPE,
    PROP_GLOBAL_IDENTIFIER,
    PROP_STATUS_FLAGS,
    PROP_RELIABILITY,
    PROP_USER_TYPE,
    PROP_CREDENTIALS,
    -1
};

static const int Properties_Optional[] = {
    -1
};

static const int Properties_Proprietary[] = {
    -1
};

void Access_User_Property_Lists(
    const int **pRequired,
    const int **pOptional,
    const int **pProprietary)
{
    if (pRequired)
        *pRequired = Properties_Required;
    if (pOptional)
        *pOptional = Properties_Optional;
    if (pProprietary)
        *pProprietary = Properties_Proprietary;

    return;
}

void Access_User_Init(
    void)
{
    unsigned i;

    if (!Access_User_Initialized) {
        Access_User_Initialized = true;

        for (i = 0; i < MAX_ACCESS_USERS; i++) {
            au_descr[i].global_identifier = 0;  /* set to some meaningful value */
            au_descr[i].reliability = RELIABILITY_NO_FAULT_DETECTED;
            au_descr[i].user_type = ACCESS_USER_TYPE_PERSON;
            au_descr[i].credentials_count = 0;
            /* fill in the credentials with proper ids */
        }
    }

    return;
}

/* we simply have 0-n object instances.  Yours might be */
/* more complex, and then you need validate that the */
/* given instance exists */
bool Access_User_Valid_Instance(
    uint32_t object_instance)
{
    if (object_instance < MAX_ACCESS_USERS)
        return true;

    return false;
}

/* we simply have 0-n object instances.  Yours might be */
/* more complex, and then count how many you have */
unsigned Access_User_Count(
    void)
{
    return MAX_ACCESS_USERS;
}

/* we simply have 0-n object instances.  Yours might be */
/* more complex, and then you need to return the instance */
/* that correlates to the correct index */
uint32_t Access_User_Index_To_Instance(
    unsigned index)
{
    return index;
}

/* we simply have 0-n object instances.  Yours might be */
/* more complex, and then you need to return the index */
/* that correlates to the correct instance number */
unsigned Access_User_Instance_To_Index(
    uint32_t object_instance)
{
    unsigned index = MAX_ACCESS_USERS;

    if (object_instance < MAX_ACCESS_USERS)
        index = object_instance;

    return index;
}

/* note: the object name must be unique within this device */
bool Access_User_Object_Name(
    uint32_t object_instance,
    BACNET_CHARACTER_STRING * object_name)
{
    static char text_string[32] = "";   /* okay for single thread */
    bool status = false;

    if (object_instance < MAX_ACCESS_USERS) {
        sprintf(text_string, "ACCESS USER %lu",
            (unsigned long) object_instance);
        status = characterstring_init_ansi(object_name, text_string);
    }

    return status;
}

/* return apdu len, or BACNET_STATUS_ERROR on error */
int Access_User_Read_Property(
    BACNET_READ_PROPERTY_DATA * rpdata)
{
    int len = 0;
    int apdu_len = 0;   /* return value */
    BACNET_BIT_STRING bit_string;
    BACNET_CHARACTER_STRING char_string;
    unsigned object_index = 0;
    unsigned i = 0;
    uint8_t *apdu = NULL;

    if ((rpdata == NULL) || (rpdata->application_data == NULL) ||
        (rpdata->application_data_len == 0)) {
        return 0;
    }
    apdu = rpdata->application_data;
    object_index = Access_User_Instance_To_Index(rpdata->object_instance);
    switch (rpdata->object_property) {
        case PROP_OBJECT_IDENTIFIER:
            apdu_len =
                encode_application_object_id(&apdu[0], OBJECT_ACCESS_USER,
                rpdata->object_instance);
            break;
        case PROP_OBJECT_NAME:
            Access_User_Object_Name(rpdata->object_instance, &char_string);
            apdu_len =
                encode_application_character_string(&apdu[0], &char_string);
            break;
        case PROP_OBJECT_TYPE:
            apdu_len =
                encode_application_enumerated(&apdu[0], OBJECT_ACCESS_USER);
            break;
        case PROP_GLOBAL_IDENTIFIER:
            apdu_len =
                encode_application_unsigned(&apdu[0],
                au_descr[object_index].global_identifier);
            break;
        case PROP_STATUS_FLAGS:
            bitstring_init(&bit_string);
            bitstring_set_bit(&bit_string, STATUS_FLAG_IN_ALARM, false);
            bitstring_set_bit(&bit_string, STATUS_FLAG_FAULT, false);
            bitstring_set_bit(&bit_string, STATUS_FLAG_OVERRIDDEN, false);
            bitstring_set_bit(&bit_string, STATUS_FLAG_OUT_OF_SERVICE, false);
            apdu_len = encode_application_bitstring(&apdu[0], &bit_string);
            break;
        case PROP_RELIABILITY:
            apdu_len =
                encode_application_enumerated(&apdu[0],
                au_descr[object_index].reliability);
            break;
        case PROP_USER_TYPE:
            apdu_len =
                encode_application_enumerated(&apdu[0],
                au_descr[object_index].user_type);
            break;
        case PROP_CREDENTIALS:
            for (i = 0; i < au_descr[object_index].credentials_count; i++) {
                len =
                    bacapp_encode_device_obj_ref(&apdu[0],
                    &au_descr[object_index].credentials[i]);
                if (apdu_len + len < MAX_APDU)
                    apdu_len += len;
                else {
                    rpdata->error_code =
                        ERROR_CODE_ABORT_SEGMENTATION_NOT_SUPPORTED;
                    apdu_len = BACNET_STATUS_ABORT;
                    break;
                }
            }
            break;
        default:
            rpdata->error_class = ERROR_CLASS_PROPERTY;
            rpdata->error_code = ERROR_CODE_UNKNOWN_PROPERTY;
            apdu_len = BACNET_STATUS_ERROR;
            break;
    }
    /*  only array properties can have array options */
    if ((apdu_len >= 0) && (rpdata->array_index != BACNET_ARRAY_ALL)) {
        rpdata->error_class = ERROR_CLASS_PROPERTY;
        rpdata->error_code = ERROR_CODE_PROPERTY_IS_NOT_AN_ARRAY;
        apdu_len = BACNET_STATUS_ERROR;
    }

    return apdu_len;
}

/* returns true if successful */
bool Access_User_Write_Property(
    BACNET_WRITE_PROPERTY_DATA * wp_data)
{
    bool status = false;        /* return value */
    int len = 0;
    BACNET_APPLICATION_DATA_VALUE value;
    unsigned object_index = 0;

    /* decode the some of the request */
    len =
        bacapp_decode_application_data(wp_data->application_data,
        wp_data->application_data_len, &value);
    /* FIXME: len < application_data_len: more data? */
    if (len < 0) {
        /* error while decoding - a value larger than we can handle */
        wp_data->error_class = ERROR_CLASS_PROPERTY;
        wp_data->error_code = ERROR_CODE_VALUE_OUT_OF_RANGE;
        return false;
    }
    /*  only array properties can have array options */
    if ((wp_data->array_index != BACNET_ARRAY_ALL)) {
        wp_data->error_class = ERROR_CLASS_PROPERTY;
        wp_data->error_code = ERROR_CODE_PROPERTY_IS_NOT_AN_ARRAY;
        return false;
    }
    object_index = Access_User_Instance_To_Index(wp_data->object_instance);
    switch (wp_data->object_property) {
        case PROP_GLOBAL_IDENTIFIER:
            status =
                WPValidateArgType(&value, BACNET_APPLICATION_TAG_UNSIGNED_INT,
                &wp_data->error_class, &wp_data->error_code);
            if (status) {
                au_descr[object_index].global_identifier =
                    value.type.Unsigned_Int;
            }
            break;

        case PROP_OBJECT_IDENTIFIER:
        case PROP_OBJECT_NAME:
        case PROP_OBJECT_TYPE:
        case PROP_STATUS_FLAGS:
        case PROP_RELIABILITY:
        case PROP_USER_TYPE:
        case PROP_CREDENTIALS:
            wp_data->error_class = ERROR_CLASS_PROPERTY;
            wp_data->error_code = ERROR_CODE_WRITE_ACCESS_DENIED;
            break;
        default:
            wp_data->error_class = ERROR_CLASS_PROPERTY;
            wp_data->error_code = ERROR_CODE_UNKNOWN_PROPERTY;
            break;
    }

    return status;
}


#ifdef TEST
#include <assert.h>
#include <string.h>
#include "ctest.h"

bool WPValidateArgType(
    BACNET_APPLICATION_DATA_VALUE * pValue,
    uint8_t ucExpectedTag,
    BACNET_ERROR_CLASS * pErrorClass,
    BACNET_ERROR_CODE * pErrorCode)
{
    pValue = pValue;
    ucExpectedTag = ucExpectedTag;
    pErrorClass = pErrorClass;
    pErrorCode = pErrorCode;

    return false;
}

void testAccessUser(
    Test * pTest)
{
    uint8_t apdu[MAX_APDU] = { 0 };
    int len = 0;
    uint32_t len_value = 0;
    uint8_t tag_number = 0;
    uint32_t decoded_instance = 0;
    uint16_t decoded_type = 0;
    BACNET_READ_PROPERTY_DATA rpdata;

    Access_User_Init();
    rpdata.application_data = &apdu[0];
    rpdata.application_data_len = sizeof(apdu);
    rpdata.object_type = OBJECT_ACCESS_USER;
    rpdata.object_instance = 1;
    rpdata.object_property = PROP_OBJECT_IDENTIFIER;
    rpdata.array_index = BACNET_ARRAY_ALL;
    len = Access_User_Read_Property(&rpdata);
    ct_test(pTest, len != 0);
    len = decode_tag_number_and_value(&apdu[0], &tag_number, &len_value);
    ct_test(pTest, tag_number == BACNET_APPLICATION_TAG_OBJECT_ID);
    len = decode_object_id(&apdu[len], &decoded_type, &decoded_instance);
    ct_test(pTest, decoded_type == rpdata.object_type);
    ct_test(pTest, decoded_instance == rpdata.object_instance);

    return;
}

#ifdef TEST_ACCESS_USER
int main(
    void)
{
    Test *pTest;
    bool rc;

    pTest = ct_create("BACnet Access User", NULL);
    /* individual tests */
    rc = ct_addTestFunction(pTest, testAccessUser);
    assert(rc);

    ct_setStream(pTest, stdout);
    ct_run(pTest);
    (void) ct_report(pTest);
    ct_destroy(pTest);

    return 0;
}
#endif /* TEST_ACCESS_USER */
#endif /* TEST */
