#include "base_midi.h"

#include "driverlib/uart.h"
#include "driverlib/sysctl.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "inc/hw_uart.h"
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"


void UART1IntHandler(void) {
  UARTIntClear(UART1_BASE, UART_INT_RX);
  while (UARTCharsAvail(UART1_BASE)) {
    parse_midi_stream(UARTCharGet(UART1_BASE));
  }
}

void UARTWrite(uint8_t byte) {
  UARTCharPut(UART1_BASE, byte);
}

static void nothing0(void) {}
static void nothing1(uint8_t) {}
static void nothing2(uint8_t, uint8_t) {}
static void nothing3(uint8_t, uint8_t, uint8_t) {}
static bool quit_parsing(uint8_t) { // TODO: fix library parsers so this works.
  return false;
}


bool note_on_flag = false;

void button_handler(void) {
  GPIOIntClear(GPIO_PORTF_BASE, GPIO_INT_PIN_4);
  if (!note_on_flag) {
    note_on(0x02, 0x40, 0x40);
    note_on_flag = true;
  } else {
    note_off(0x02, 0x40);
    note_on_flag = false;
  }
}



int main() {
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);

  // Initialize UART1.
  SysCtlPeripheralEnable(SYSCTL_PERIPH_UART1);


  while(!SysCtlPeripheralReady(SYSCTL_PERIPH_UART1));

  // Initialize the GPIO pins for UART1.
  GPIOPinConfigure(GPIO_PC4_U1RX);
  GPIOPinConfigure(GPIO_PC5_U1TX);
  GPIOPinTypeUART(GPIO_PORTC_BASE, GPIO_PIN_4 | GPIO_PIN_5);

  // Configure the UART using the specifications found in the minipix_uart_interface.
  // Cource code: word length - 8, 1 stop bit, no parity.
  UARTConfigSetExpClk(UART1_BASE, SysCtlClockGet(), 31250, UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE);
  UARTEnable(UART1_BASE);
  UARTIntEnable(UART1_BASE, UART_INT_RX);
  UARTIntRegister(UART1_BASE, UART1IntHandler);

  // Set up MIDI 1.0 library to ignore basically everything.
  ConsumerBehavior new_pfns = {.uart_write = UARTWrite,
			       .note_on_handler = nothing3,
			       .note_off_handler = nothing3,
			       .poly_key_handler = nothing3,
			       .control_change_handler = nothing3,
			       .program_change_handler = nothing2,
			       .all_sound_off_handler = nothing1,
			       .local_control_handler = nothing2,
			       .all_notes_off_handler = nothing1,
			       .poly_on_handler = nothing1,
			       .mtc_quarter_frame_handler = nothing2,
			       .song_position_pointer_handler = nothing2,
			       .song_select_handler = nothing1,
			       .tune_request_handler = nothing0,
			       .timing_clock_handler = nothing0,
			       .start_handler = nothing0,
			       .continue_handler = nothing0,
			       .stop_handler = nothing0,
			       .active_sensing_handler = nothing0,
			       .system_reset_handler = nothing0, // TODO: change.
			       .sysex_collector = quit_parsing,
			       .end_of_sysex_handler = nothing0,
			       /* .bulk_tuning_dump_request_handler = nothing, // TODO: change. */
			       /* .bulk_tuning_dump_handler = nothing, */
			       /* .single_note_tuning_change_handler = nothing, */
			       .unimplemented_universal_sysex_collector = quit_parsing};

  midi_init(new_pfns);

  // Interrupt whenever GPIO pin PF4 changes, due to SW1 button press.
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
  GPIOPinTypeGPIOInput(GPIO_PORTF_BASE, GPIO_PIN_4);
  GPIOPadConfigSet(GPIO_PORTF_BASE, GPIO_PIN_4, GPIO_STRENGTH_4MA, GPIO_PIN_TYPE_STD_WPU);
  GPIOIntTypeSet(GPIO_PORTF_BASE, GPIO_PIN_4, GPIO_RISING_EDGE);
  GPIOIntEnable(GPIO_PORTF_BASE, GPIO_INT_PIN_4);
  GPIOIntRegister(GPIO_PORTF_BASE, button_handler);
  while(true); // Main application loop.


}