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/* University of York Robotics Laboratory PsiSwarm Library: PsiSwarm Core Source File
 * 
 * File: psiswarm.cpp
 *
 * (C) Dept. Electronics & Computer Science, University of York
 * James Hilder, Alan Millard, Alexander Horsfield, Homero Elizondo, Jon Timmis
 *
 * PsiSwarm Library Version: 0.4
 *
 * February 2016
 *
 *
 */ 

#include "psiswarm.h"

//Setup MBED connections to PsiSwarm Robot
Serial pc(USBTX,USBRX);
I2C primary_i2c (p9, p10);
InterruptIn gpio_interrupt (p12);
Serial bt(p13, p14);
AnalogIn vin_current(p15);
AnalogIn vin_battery(p16);
AnalogIn vin_dc(p17);
PwmOut motor_left_f (p21);
PwmOut motor_left_r (p22);
PwmOut motor_right_f(p23);
PwmOut motor_right_r(p24);
PwmOut center_led_red(p25);
PwmOut center_led_green(p26);
Display display;  //Connects to i2c(p28,p27), reset(p29), backlight(p30)
DigitalOut mbed_led1(LED1);
DigitalOut mbed_led2(LED2);
DigitalOut mbed_led3(LED3);
DigitalOut mbed_led4(LED4);


float center_led_brightness;
float backlight_brightness;

Ticker event_handler;
Timer uptime;
Timeout pause_usercode_timeout;
Ticker ultrasonic_ticker;
Timeout ultrasonic_timeout;
int timer_minute_count;
Ticker timer_ticker;

float firmware_version;
char robot_id;
char previous_robot_id;

char wheel_encoder_byte;
char previous_wheel_encoder_byte;
signed int left_encoder;
signed int right_encoder;

char time_based_motor_action = 0;

char testing_voltage_regulators_flag = 1;
char power_good_motor_left = 2;
char power_good_motor_right = 2;
char power_good_infrared = 2;
char status_dc_in = 2;
char status_charging = 2;

char switch_byte;
char previous_switch_byte;

char debug_mode = DEBUG_MODE;
char debug_output = DEBUG_OUTPUT_STREAM;
 
char firmware_bytes[21];

int base_colour_sensor_raw_values [4];
int top_colour_sensor_raw_values [4];

char waiting_for_ultrasonic = 0;
int ultrasonic_distance = 0;
char ultrasonic_distance_updated = 0;


float line_position = 0;
char line_found = 0;

unsigned short background_ir_values [8];
unsigned short illuminated_ir_values [8];
float reflected_ir_distances [8];
char ir_values_stored = 0;
unsigned short background_base_ir_values [5];
unsigned short illuminated_base_ir_values [5];
char base_ir_values_stored = 0;

float motor_left_speed;
float motor_right_speed;
char motor_left_brake;
char motor_right_brake;

char demo_on = 0;
char event = 0;
char change_id_event = 0;
char encoder_event = 0;
char switch_event = 0;
char user_code_running = 0;
char user_code_restore_mode = 0;
char system_warnings = 0;


vector<string> basic_filenames; //filenames are stored in a vector string
char psi_basic_file_count = 0;
char use_flash_basic = 0;
char file_transfer_mode = 0;

int ir_pulse_delay = DEFAULT_IR_PULSE_DELAY;
int base_ir_pulse_delay = DEFAULT_BASE_IR_PULSE_DELAY;


/**
 * init()
 *
 * Main initialisation routine for the PsiSwarm robot
 *
 * Set up the GPIO expansion ICs, launch demo mode if button is held
 */
void init()
{
    firmware_version=0;
    timer_minute_count = 0;
    timer_ticker.attach(&IF_update_minutes, 300);
    uptime.start();
    primary_i2c.frequency(400000);
    IF_setup_serial_interfaces();
    debug("PsiSwarm Robot Library %1.2f\n\n",SOFTWARE_VERSION_CODE);
    debug("- Setting up serial interface\n");
    debug("- Reading firmware: ");
    if(read_firmware() == 1){
        debug("Version %3.2f\n",firmware_version);   
    }else debug("INVALID\n");
    
    if(ENABLE_BASIC == 1){
        read_list_of_file_names();   
        if(psi_basic_file_count == 0){
            debug("- No PsiBasic files found\n");   
        }
        else use_flash_basic = 1;
    }
    debug("- Setting up PIC microcontroller\n");
    // IF_check_pic_firmware();
    debug("- Setting up LED drivers\n");
    IF_init_leds();    
    if(IF_setup_led_expansion_ic() != 0) {
        debug("- WARNING: No I2C acknowledge for LED driver\n");   
        system_warnings += 1; 
    }
    debug("- Setting up motor drivers\n");
    IF_init_motors();   
    debug("- Setting up GPIO expansion\n");
    reset_encoders();
    IF_setup_gpio_expansion_ic();
    debug("- Setting up temperature sensor\n");
    IF_setup_temperature_sensor();
    debug("- Setting up base colour sensor\n");
    IF_check_base_colour_sensor();
    debug("- Setting up ultrasonic sensor\n");
    //enable_ultrasonic_ticker();
    debug("- Robot ID: %d\n",robot_id);
    char switchstate = IF_get_switch_state(); 
    debug("- Switch State   : %d\n",switchstate);
    debug("- Battery Voltage: %1.3fV\n",get_battery_voltage());
    debug("- DC Voltage     : %1.3fV\n",get_dc_voltage());
    debug("- Current Draw   : %1.3fA\n",get_current());
    debug("- Temperature    : %1.3fC\n",get_temperature());
    char demo = 0;
    if(ENABLE_DEMO == 1 && switchstate > 0) demo=1;
    display.init_display(demo);
    event_handler.attach_us(&IF_handle_events, 1000);
    if(demo > 0){      
        debug("- Demo mode button is pressed\n");
        wait(1.0);
        demo = IF_get_switch_state();
        if(demo > 0) demo_mode();
        display.init_display(0);  
    }
}

void IF_update_minutes(){
    uptime.reset();
    timer_minute_count += 5;
}

void IF_handle_events()
{
    // This is the main 'operating system' thread that handles events from robot stimuli
    // By default it is run every 1ms and checks if there are events to handle
    if(event > 0){
        // There are some events to handle.  We don't handle all events in every loop to keep the system responsive, instead they are priorised.
        if(encoder_event == 1){
            // The encoders have changed; update the encoder values
            IF_update_encoders();
            encoder_event = 0; 
            event--;  
        }  else {
            if(switch_event == 1){
               IF_update_switch();
               switch_event = 0;
               event--; 
            }
            if(change_id_event == 1){
                // The user ID for the robot has been changed
                IF_update_user_id();
                change_id_event = 0;
                event--;
            }
        }
    }   
}

void IF_update_encoders()
{
    char rwep = previous_wheel_encoder_byte >> 2;
    char rwe = wheel_encoder_byte >> 2;
    char lwep = previous_wheel_encoder_byte % 4;
    char lwe = wheel_encoder_byte % 4;
    //pc.printf("L:%d P:%d   R:%d P:%d  \n",lwe,lwep,rwe,rwep);
    if(lwe == 0 && lwep==1) left_encoder++;
    if(lwe == 0 && lwep==2) left_encoder--;
    if(rwe == 0 && rwep==1) right_encoder++;
    if(rwe == 0 && rwep==2) right_encoder--;
    if(left_encoder % 100 == 0) pc.printf("L:%d\n",left_encoder);
}

void IF_update_user_id()
{
}

void IF_update_switch()
{
    // The user switch has changed state
    // In this implementation we will only act on positive changes (rising edges)
    // Subtracting new_state from (new_state & old_state) gives the positive changes
    char positive_change = switch_byte - (switch_byte & previous_switch_byte);
    if(demo_on) demo_handle_switch_event(positive_change);
    else handle_switch_event(positive_change);
}

void reset_encoders()
{
    left_encoder = 0;
    right_encoder = 0;    
}

void debug(const char* format, ...) 
{
  char buffer[256];
  if (debug_mode){
  va_list vl;
  va_start(vl, format);
  vsprintf(buffer,format,vl);
  if(debug_output & 2) bt.printf("%s", buffer);
  if(debug_output & 1) pc.printf("%s", buffer);
  if(debug_output & 4) display.debug_page(buffer,strlen(buffer));
  va_end(vl);
  }
}

float get_uptime(void)
{
    return uptime.read() + (timer_minute_count * 60);   
}

void pause_user_code(float period){
    user_code_restore_mode = user_code_running;
    user_code_running = 0;
    pause_usercode_timeout.attach(&IF_end_pause_user_code, period);
}

void IF_end_pause_user_code(){
     user_code_running = user_code_restore_mode;
}