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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.
 */

/*
 *  A representation of an OBD-II PID.
 *
 * pid - The 1 byte PID.
 * name - A human readable name to use for this PID when published.
 * frequency - The frequency to request this PID if supported by the vehicle
 *      when automatic, recurring OBD-II requests are enabled.
 */

enum UNIT {
	POURCENT,
	DEGREES_CELSIUS,
	KPA,
	RPM,
	GRAMS_SEC,
	SECONDS,
	KM,
	KM_H,
	PA,
	NM
};

const char *UNIT_NAMES[10] = {
	"POURCENT",
	"DEGREES_CELSIUS",
	"KPA",
	"RPM",
	"GRAMS_SEC",
	"SECONDS",
	"KM",
	"KM_H",
	"PA",
	"NM"
};

typedef struct _Obd2Pid {
    uint8_t pid;
    const char* name;
    const int min;
    const int max;
    enum UNIT unit;
    int frequency;
} Obd2Pid;

/*
    { pid: 0x4, name: "engine.load", frequency: 5 },
    { pid: 0x5, name: "engine.coolant.temperature", frequency: 1 },
    { pid: 0xa, name: "fuel.pressure", frequency: 1 },
    { pid: 0xb, name: "intake.manifold.pressure", frequency: 1 },
    { pid: 0xc, name: "engine.speed", frequency: 5 },
    { pid: 0xd, name: "vehicle.speed", frequency: 5 },
    { pid: 0xf, name: "intake.air.temperature", frequency: 1 },
    { pid: 0x10, name: "mass.airflow", frequency: 5 },
    { pid: 0x11, name: "throttle.position", frequency: 5 },
    { pid: 0x1f, name: "running.time", frequency: 1 },
    { pid: 0x27, name: "fuel.level", frequency: 1 },
    { pid: 0x33, name: "barometric.pressure", frequency: 1 },
    { pid: 0x4c, name: "commanded.throttle.position", frequency: 1 },
    { pid: 0x52, name: "ethanol.fuel.percentage", frequency: 1 },
    { pid: 0x5a, name: "accelerator.pedal.position", frequency: 5 },
    { pid: 0x5c, name: "engine.oil.temperature", frequency: 1 },
    { pid: 0x63, name: "engine.torque", frequency: 1 },
};
 */

/* Public: Check if a request is an OBD-II PID request.
 *
 * Returns true if the request is a mode 1  request and it has a 1 byte PID.
 */
bool isObd2Request(DiagnosticRequest* request);

/* Public: Decode the payload of an OBD-II PID.
 *
 * This function matches the type signature for a DiagnosticResponseDecoder, so
 * it can be used as the decoder for a DiagnosticRequest. It returns the decoded
 * value of the PID, using the standard formulas (see
 * http://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_01).
 */
float handleObd2Pid(const DiagnosticResponse* response, float parsedPayload);

/*
 * Object to handle obd2 session with pre-scan of supported pid
 * then request them regularly
 */
class Obd2Handler_c {
    private:
        /*
        * Pre-defined OBD-II PIDs to query for if supported by the vehicle.
        */
        const Obd2Pid OBD2_PIDS[] = {
            { pid: 0x4, name: "obd2.engine.load", min:0, max: 100, unit: POURCENT, frequency: 5 },
            { pid: 0x5, name: "obd2.engine.coolant.temperature", min: -40, max: 215, unit: DEGREES_CELSIUS, frequency: 1 },
            { pid: 0xa, name: "obd2.fuel.pressure", min: 0, max: 765, unit: KPA, frequency: 1 },
            { pid: 0xb, name: "obd2.intake.manifold.pressure", min: 0, max: 255, unit: KPA, frequency: 1 },
            { pid: 0xc, name: "obd2.engine.speed", min: 0, max: 16383, unit: RPM, frequency: 5 },
            { pid: 0xd, name: "obd2.vehicle.speed", min: 0, max: 255, unit: KM_H, frequency: 5 },
            { pid: 0xf, name: "obd2.intake.air.temperature", min: -40, max:215, unit: DEGREES_CELSIUS, frequency: 1 },
            { pid: 0x10, name: "obd2.mass.airflow", min: 0, max: 655, unit: GRAMS_SEC, frequency: 5 },
            { pid: 0x11, name: "obd2.throttle.position", min: 0, max: 100, unit: POURCENT, frequency: 5 },
            { pid: 0x1f, name: "obd2.running.time", min: 0, max: 65535, unit: SECONDS, frequency: 1 },
            { pid: 0x2d, name: "obd2.EGR.error", min: -100, max: 99, unit: POURCENT, frequency: 0 },
            { pid: 0x2f, name: "obd2.fuel.level", min: 0, max: 100, unit: POURCENT, frequency: 1 },
            { pid: 0x33, name: "obd2.barometric.pressure", min: 0, max: 255, unit: KPA, frequency: 1 },
            { pid: 0x4c, name: "obd2.commanded.throttle.position", min: 0, max: 100, unit: POURCENT, frequency: 1 },
            { pid: 0x52, name: "obd2.ethanol.fuel.percentage", min: 0, max: 100, unit: POURCENT, frequency: 1 },
            { pid: 0x5a, name: "obd2.accelerator.pedal.position", min: 0, max: 100, unit: POURCENT, frequency: 5 },
            { pid: 0x5b, name: "obd2.hybrid.battery-pack.remaining.life", min: 0, max: 100, unit: POURCENT, frequency: 5 },
            { pid: 0x5c, name: "obd2.engine.oil.temperature",min: -40, max: 210, unit: DEGREES_CELSIUS, frequency: 1 },
            { pid: 0x63, name: "obd2.engine.torque", min: 0, max: 65535, unit: NM, frequency: 1 },
        };

        /*
         * Will be populated with constructor
         */
        Obd2Pid supported_pids[];

        public:
            Obd2Handler_c();
            
            bool isObd2Request(request);
}