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/*
 * Copyright (C) 2015, 2016 "IoT.bzh"
 * Author "Romain Forlot" <romain.forlot@iot.bzh>
 *
 * 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.
 */

Decoder::Decoder
{
	decoded_value = { .has_type = false,
					.has_numeric_value = false,
					.has_boolean_value = false,
					.has_string_value = false };
}

float Decoder::parseSignalBitfield(CanSignal* signal, const CanMessage* message)
{
	 return bitfield_parse_float(message->data, CAN_MESSAGE_SIZE,
			signal->bitPosition, signal->bitSize, signal->factor,
			signal->offset);
}

openxc_DynamicField Decoder::noopDecoder(CanSignal* signal,
        CanSignal* signals, int signalCount, float value, bool* send)
{
	decoded_value = { .has_type = true,
					.type = openxc_DynamicField_Type_NUM,
					.has_numeric_value = true,
					.numeric_value = value };
    return decoded_value;
}

openxc_DynamicField Decoder::booleanDecoder(CanSignal* signal,
        CanSignal* signals, int signalCount, float value, bool* send)
{
	decoded_value = { .has_type = true,
					.type = openxc_DynamicField_Type_BOOL,
					.has_boolean_value = true,
					.numeric_value = value == 0.0 ? false : true };
	return decoded_value;
}

openxc_DynamicField Decoder::ignoreDecoder(CanSignal* signal,
        CanSignal* signals, int signalCount, float value, bool* send)
{
    *send = false;
    openxc_DynamicField decoded_value = {0};
    return decoded_value;
}

openxc_DynamicField Decoder::stateDecoder(CanSignal* signal,
        CanSignal* signals, int signalCount, float value, bool* send)
{
    openxc_DynamicField decoded_value = {0};
    decoded_value.has_type = true;
    decoded_value.type = openxc_DynamicField_Type_STRING;
    decoded_value.has_string_value = true;

    const CanSignalState* signalState = lookupSignalState(value, signal);
    if(signalState != NULL) {
        strcpy(decoded_value.string_value, signalState->name);
    } else {
        *send = false;
    }
    return decoded_value;
}

openxc_DynamicField Decoder::decodeSignal(CanSignal* signal,
        float value, CanSignal* signals, int signalCount, bool* send)
{
    SignalDecoder decoder = signal->decoder == NULL ?
				            noopDecoder : signal->decoder;
    openxc_DynamicField decoded_value = decoder(signal, signals,
            signalCount, value, send);
    return decoded_value;
}

openxc_DynamicField Decoder::decodeSignal(CanSignal* signal,
        const CanMessage* message, CanSignal* signals, int signalCount,
        bool* send) {
    float value = parseSignalBitfield(signal, message);
    return decodeSignal(signal, value, signals, signalCount, send);
}