/*
 * ReceiveAndSendDistanceWidth.cpp
 *
 * Record and play back last received distance width IR signal at button press.
 * Using DistanceWidthProtocol covers a lot of known and unknown IR protocols,
 * and requires less memory than raw protocol.
 *
 * The logic is:
 * If the button is pressed, send the IR code.
 * If an IR code is received, record it.
 *
 * An example for simultaneous receiving and sending is in the UnitTest example.
 *
 * An IR detector/demodulator must be connected to the input IR_RECEIVE_PIN.
 *
 * A button must be connected between the input SEND_BUTTON_PIN and ground.
 * A visible LED can be connected to STATUS_PIN to provide status.
 *
 * See also https://dronebotworkshop.com/ir-remotes/#ReceiveAndSendDistanceWidth_Code
 *
 *  This file is part of Arduino-IRremote https://github.com/Arduino-IRremote/Arduino-IRremote.
 *
 ************************************************************************************
 * MIT License
 *
 * Copyright (c) 2023 Armin Joachimsmeyer
 *
 * 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.
 *
 ************************************************************************************
 */
#include <Arduino.h>

#if !defined(IR_SEND_PIN)
#define IR_SEND_PIN       3 // P0_0
#endif

#define IR_RECEIVE_PIN    4 // P0_1 
 
#define SEND_BUTTON_PIN   BTN_BUILTIN
#define BTN_ACTIVE_STATE  HIGH    // HIGH for Elbear boards, LOW for Start board

/*
 * Helper macro for getting a macro definition as string
 */
#if !defined(STR_HELPER)
#define STR_HELPER(x) #x
#define STR(x) STR_HELPER(x)
#endif


/*
 * Specify DistanceWidthProtocol for decoding. This must be done before the #include <IRremote.hpp>
 */
#define DECODE_DISTANCE_WIDTH // Universal decoder for pulse distance width protocols
//
#if !defined(RAW_BUFFER_LENGTH)
#define RAW_BUFFER_LENGTH  750
#endif

//#define NO_LED_FEEDBACK_CODE      // saves 92 bytes program memory
//#define RECORD_GAP_MICROS 12000   // Default is 8000. Activate it for some LG air conditioner protocols
//#define SEND_PWM_BY_TIMER         // Disable carrier PWM generation in software and use (restricted) hardware PWM.
//#define USE_NO_SEND_PWM           // Use no carrier PWM, just simulate an active low receiver signal. Overrides SEND_PWM_BY_TIMER definition

//#define DEBUG // Activate this for lots of lovely debug output from the decoders.

#include <IRremote.hpp>

#define DELAY_BETWEEN_REPEATS_MILLIS        70

// Storage for the recorded code, pre-filled with NEC data
IRRawDataType sDecodedRawDataArray[RAW_DATA_ARRAY_SIZE] = { 0x7B34ED12 }; // Initialize with NEC address 0x12 and command 0x34
DistanceWidthTimingInfoStruct sDistanceWidthTimingInfo = { 9000, 4500, 560, 1690, 560, 560 }; // Initialize with NEC timing
uint8_t sNumberOfBits = 32;

bool sSendButtonWasActive;

void setup() {
    pinMode(SEND_BUTTON_PIN, INPUT);

    Serial.begin(9600);
    while (!Serial)
        ; // Wait for Serial to become available. Is optimized away for some cores.

    // Just to know which program is running on my Arduino
    Serial.println(F("START " __FILE__ " from " __DATE__ "\r\nUsing library version " VERSION_IRREMOTE));

    // Start the receiver and if not 3. parameter specified, take LED_BUILTIN pin from the internal boards definition as default feedback LED
    IrReceiver.begin(IR_RECEIVE_PIN, ENABLE_LED_FEEDBACK);
    Serial.println(F("Ready to receive pulse distance/width coded IR signals at pin " STR(IR_RECEIVE_PIN)));

    IrSender.begin(); // Start with IR_SEND_PIN as send pin and enable feedback LED at default feedback LED pin
    Serial.print(F("Ready to send IR signals at pin " STR(IR_SEND_PIN) " on press of button at pin "));
    Serial.println(SEND_BUTTON_PIN);
}

void loop() {

    // If button pressed, send the code.
    bool tSendButtonIsActive = (digitalRead(SEND_BUTTON_PIN) == BTN_ACTIVE_STATE);

    /*
     * Check for current button state
     */
    if (tSendButtonIsActive) {
        if (!sSendButtonWasActive) {
            Serial.println(F("Stop receiving"));
            IrReceiver.stop();
        }
        /*
         * Button pressed -> send stored data
         */
        Serial.print(F("Button pressed, now sending "));
        Serial.print(sNumberOfBits);
        Serial.print(F(" bits 0x"));
        Serial.print(sDecodedRawDataArray[0], HEX);
        Serial.print(F(" with sendPulseDistanceWidthFromArray timing="));
        IrReceiver.printDistanceWidthTimingInfo(&Serial, &sDistanceWidthTimingInfo);
        Serial.println();
        Serial.flush(); // To avoid disturbing the software PWM generation by serial output interrupts

        IrSender.sendPulseDistanceWidthFromArray(38, &sDistanceWidthTimingInfo, &sDecodedRawDataArray[0], sNumberOfBits,
#if defined(USE_MSB_DECODING_FOR_DISTANCE_DECODER)
                PROTOCOL_IS_MSB_FIRST
#else
                PROTOCOL_IS_LSB_FIRST
#endif
                , 100, 0);

        delay(DELAY_BETWEEN_REPEATS_MILLIS); // Wait a bit between retransmissions

    } else if (sSendButtonWasActive) {
        /*
         * Button is just released -> activate receiving
         */
        // Restart receiver
        Serial.println(F("Button released -> start receiving"));
        IrReceiver.start();

    } else if (IrReceiver.decode()) {
        /*
         * Button is not pressed and data available -> store received data and resume
         * DistanceWidthTimingInfo and sNumberOfBits should be constant for all keys of the same IR remote / protocol
         */
        IrReceiver.printIRResultShort(&Serial);
        if (IrReceiver.decodedIRData.protocol != UNKNOWN) {
            IrReceiver.printIRSendUsage(&Serial);

            if (memcmp(&sDistanceWidthTimingInfo, &IrReceiver.decodedIRData.DistanceWidthTimingInfo,
                    sizeof(sDistanceWidthTimingInfo)) != 0) {
                Serial.print(F("Store new timing info data="));
                IrReceiver.printDistanceWidthTimingInfo(&Serial, &IrReceiver.decodedIRData.DistanceWidthTimingInfo);
                Serial.println();
                sDistanceWidthTimingInfo = IrReceiver.decodedIRData.DistanceWidthTimingInfo; // copy content here
            } else {
                Serial.print(F("Timing did not change, so we can reuse already stored timing info."));
            }
            if (sNumberOfBits != IrReceiver.decodedIRData.numberOfBits) {
                Serial.print(F("Store new numberOfBits="));
                sNumberOfBits = IrReceiver.decodedIRData.numberOfBits;
                Serial.println(IrReceiver.decodedIRData.numberOfBits);
            }
            if (sDecodedRawDataArray[0] != IrReceiver.decodedIRData.decodedRawDataArray[0]) {
                *sDecodedRawDataArray = *IrReceiver.decodedIRData.decodedRawDataArray; // copy content here
                Serial.print(F("Store new sDecodedRawDataArray[0]=0x"));
                Serial.println(IrReceiver.decodedIRData.decodedRawDataArray[0], HEX);
            }
        }
        IrReceiver.resume(); // resume receiver
        Serial.println();
    }

    sSendButtonWasActive = tSendButtonIsActive;
    delay(100);
}