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#include <iostream>
#include <driver/spi_master.h>
#include <esp_err.h>

#define HSPI_MISO  12
#define HSPI_MOSI  -1  //pin 13 if used
#define HSPI_SCK   14
#define HSPI_SS    15

extern "C" {
    void app_main(void);
}

class BruteForce {
    public:
        BruteForce() {
                buscfg.mosi_io_num = HSPI_MOSI;
                buscfg.miso_io_num = HSPI_MISO;
                buscfg.sclk_io_num = HSPI_SCK;
                buscfg.quadwp_io_num = -1;
                buscfg.quadhd_io_num = -1;
                buscfg.max_transfer_sz = 4;  //4 BYTES???
                buscfg.flags = SPICOMMON_BUSFLAG_MASTER | SPICOMMON_BUSFLAG_MISO | SPICOMMON_BUSFLAG_SCLK;

                devcfg.command_bits = 0;
                devcfg.address_bits = 0;
                devcfg.dummy_bits = 0;      //note this; if dropping bits at start of cycle
                devcfg.mode = 0;           //0,1,2,3.  has to do with clock polarity, phase, and edge.  See wikipedia.org for spi mode numbers
                devcfg.duty_cycle_pos = 0; // setting to 0 defaults to 128, 50% duty cycle
                devcfg.cs_ena_pretrans = 0;  //amount of spi bit-cycles cs activated before transmission.
                devcfg.cs_ena_posttrans = 0;  //sim to pretrans, but trailing
                devcfg.clock_speed_hz = 10000; //10 khz; clock speed in hz
                devcfg.spics_io_num = -1;  //CS GPIO pin, -1 if not used
                devcfg.flags = SPICOMMON_BUSFLAG_MASTER | SPICOMMON_BUSFLAG_MISO | SPICOMMON_BUSFLAG_SCLK;  //spi_device_ flags
                devcfg.queue_size = 10; //queue depth.  0 will cause crash
                devcfg.pre_cb = NULL; //callback before trans ========not sure here
                devcfg.post_cb = NULL; //callback after trans ========not sure here
        }
        void init(void) {
            if(( err = spi_bus_initialize(HSPI_HOST, &buscfg, 0 )) != ESP_OK ) {
                std::cout << esp_err_to_name(err) << "\n";
            } else {
                std::cout << "init: initialize OK\n";
            }

            //Note: it crashes if queue_size = 0
            if(( err = spi_bus_add_device(HSPI_HOST, &devcfg, &devhandle) ) != ESP_OK ) {
                std::cout << esp_err_to_name(err) << "\n";
            } else {
                std::cout << "init: add_device OK\n";
            }
            
        };

    private:
        esp_err_t err;
        spi_bus_config_t buscfg;
        spi_device_interface_config_t devcfg;
        spi_device_handle_t devhandle;

};


void app_main(void) {
    BruteForce bf = BruteForce();

    bf.init();
}