// #define DEBUG

#define BAUD_RATE 115200

#include "common.h"

#include "fpga.h"
#include "wifi.h"
#include "config.h"
#include "led.h"
#include "tty.h"
#include "boardinfo_esp.h"

#include <freertos/task_snapshot.h>
#include <esp_heap_caps.h>
#include <esp_task_wdt.h>
#include <esp_mac.h>

#include <USB.h>
#include <HardwareSerial.h>

#define PIN_USB_PWR_EN		7
#define PIN_USB_PWR_SINK	8

uint8_t efuse_default_mac[6];
char serial_number[16];		// Canonical board serial number

void setup_usb_ids()
{
    uint8_t * const mac = efuse_default_mac;

    esp_efuse_mac_get_default(mac);
    snprintf(serial_number, sizeof serial_number, "%02X%02X%02X-%02X%02X%02X",
	     mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);

    USB.VID(0x4680);
    USB.PID(0x0882);
    USB.firmwareVersion(1);	// Do something smarter here
    USB.productName("MAX80 Network Controller");
    USB.manufacturerName("Peter & Per");
    USB.serialNumber(serial_number);
}

static void heap_info()
{
    size_t il = heap_caps_get_largest_free_block(MALLOC_CAP_INTERNAL);
    size_t ia = heap_caps_get_free_size(MALLOC_CAP_INTERNAL);
    size_t sl = heap_caps_get_largest_free_block(MALLOC_CAP_SPIRAM);
    size_t sa = heap_caps_get_free_size(MALLOC_CAP_SPIRAM);

    printf("Heap: sram %zu/%zu, spiram %zu/%zu\n", il, ia, sl, sa);
}

static void dump_config()
{
    printf("--- Configuration:\n");
    write_env(stdout, false);
    printf("--- Status:\n");
    write_env(stdout, true);
    printf("--- End configuration and status\n");
}

static void init_hw()
{
    // Start out with disabled shared I/O pins
    for (int i = 1; i <= 18; i++)
	pinMode(i, INPUT);

    // Query board info
    board_info_init();

    // Make sure FPGA nCE input (board 2.1+) is not accidentally pulled high
    fpga_enable_nce();

    // Configure USB power control. Try to detect 36k pulldown
    // resistor on USB_PWR_EN first, to determine board version 2
    // (on board v1, this pin in N/C.)
    //
    // This detection algorithm is sketchy at best. In the end the
    // better option probably would be to use the ADC mode of the input
    // pin...
    pinMode(PIN_USB_PWR_SINK, OUTPUT);		// IO8: USB_PWR_SINK
    digitalWrite(PIN_USB_PWR_SINK, 0);		// This is a power sink

    pinMode(PIN_USB_PWR_EN, OUTPUT);
    digitalWrite(PIN_USB_PWR_EN, 0);
    delayMicroseconds(50);

    // Configure LEDs
    led_init();
    led_set(LED_BLUE, LED_FLASH);	// ESP32 software initializing
}

void setup() {
    const char *fwdate = __DATE__ " " __TIME__;
    init_hw();

    // Enable external PSRAM for heap
    heap_caps_malloc_extmem_enable(3000); // >= 3K allocations in PSRAM
    heap_info();

    TTY::init();
    heap_info();

    printf("[FW]   MAX80 firmware compiled on %s\n", fwdate);
    printf("[PCB]  MAX80 board version: %s\n", board_info.version_str);
    setenv_cond("status.max80.hw.ver", board_info.version_str);
    printf("[PCB]  MAX80 serial number: %s\n", serial_number);
    setenv_cond("status.max80.hw.serial", serial_number);
    Serial.println("MAX80 start");

    init_config();
    setenv_cond("status.max80.fw.date", fwdate);
    fpga_service_init();
    fpga_service_enable(true);
    SetupWiFi();
    Serial.println("[RDY]");
    dump_config();
    led_set(LED_BLUE, LED_ON);	// Software ready

    heap_info();
}

static inline char task_state(eTaskState state)
{
    switch (state) {
    case eInvalid:
	return 'X';
    case eReady:
    case eRunning:
	return 'R';
    case eBlocked:
	return 'D';
    case eSuspended:
	return 'S';
    case eDeleted:
	return 'Z';
    default:
	return '?';
    }
}

static void dump_tasks(void)
{
    TaskHandle_t task = NULL;

    while (1) {
	task = pxTaskGetNext(task);
	if (!task)
	    break;

	printf("%-16s %c %2u\n",
	       pcTaskGetName(task),
	       task_state(eTaskGetState(task)),
	       uxTaskPriorityGet(task));
    }
}

void loop() {
    if (0) {
	printf("loop task: %s\n", pcTaskGetName(xTaskGetCurrentTaskHandle()));
	printf("idle task: %s\n", pcTaskGetName(xTaskGetIdleTaskHandle()));
	dump_tasks();
	heap_info();
	putchar('\n');
    }

    TTY::ping();
    vTaskDelay(5 * configTICK_RATE_HZ);
}