Flipdot-display/src/esp32/logic/settings.cpp

#include "logic/settings.h"

#include <stdio.h>
#include <string.h>

#include "logic/bitmap_format.h"

static bool terminated(const char *text, int size)
{
	return memchr(text, '\0', size) != nullptr;
}

const char *validateSettings(const Settings &s)
{
	if (!terminated(s.page, sizeof(s.page)) || !validBitmapName(s.page))
		return "Unknown page";
	if (!terminated(s.off_page, sizeof(s.off_page)) || (s.off_page[0] && !validBitmapName(s.off_page)))
		return "Unknown off image";

	const ScheduleSettings &t = s.schedule;
	if (t.day_start >= MINUTES_PER_DAY || t.late_start > MINUTES_PER_DAY || t.night_start > MINUTES_PER_DAY)
		return "Times must be between 00:00 and 24:00";
	if (t.day_start > t.late_start || t.late_start > t.night_start)
		return "The times must be in order: day start, late evening, night";

	if (s.flip_time < SETTINGS_FLIP_TIME_MIN || s.flip_time > SETTINGS_FLIP_TIME_MAX)
		return "The flip time must be between 50 and 2000 us";

	const DriveSettings &d = s.drive;
	if (d.flip_gap > 5000)
		return "The flip gap must be between 0 and 5000 us";
	if (d.pulses < 1 || d.pulses > 3)
		return "Pulses must be 1, 2 or 3";
	if (d.effect >= DRIVE_EFFECT_COUNT)
		return "Unknown refresh effect";
	if (d.effect_time < 100 || d.effect_time > 10000)
		return "The effect time must be between 100 and 10000 ms";
	if (s.refresh.dots > REFRESH_MINUTES_MAX || s.refresh.image > REFRESH_MINUTES_MAX)
		return "Refresh intervals must be between 0 and 1440 minutes";

	const HomeAssistantSettings &ha = s.home_assistant;
	if (!terminated(ha.host, sizeof(ha.host)) || !terminated(ha.user, sizeof(ha.user)) ||
		!terminated(ha.password, sizeof(ha.password)) || !terminated(ha.api_url, sizeof(ha.api_url)) ||
		!terminated(ha.token, sizeof(ha.token)))
		return "Home Assistant text too long";
	if (ha.port == 0)
		return "Invalid MQTT port";
	if (ha.api_url[0] && strncmp(ha.api_url, "http://", 7) != 0)
		return "The Home Assistant URL must start with http:// (https is not supported)";

	return nullptr;
}

uint32_t effectTime(const DriveSettings &drive)
{
	if (drive.effect == DRIVE_EFFECT_INSTANT)
		return 0;
	if (drive.effect == DRIVE_EFFECT_PUSH || drive.effect == DRIVE_EFFECT_RANDOM)
		return drive.effect_time + DRIVE_PUSH_EXTRA_TIME;
	return drive.effect_time;
}

bool parseTime(const char *text, uint16_t &minutes)
{
	if (text == nullptr)
		return false;
	int hour = 0, minute = 0;
	char extra;
	if (sscanf(text, "%d:%d%c", &hour, &minute, &extra) != 2)
		return false;
	if (hour < 0 || minute < 0 || minute > 59 || hour * 60 + minute > MINUTES_PER_DAY)
		return false;
	minutes = hour * 60 + minute;
	return true;
}

void formatTime(uint16_t minutes, char *out)
{
	snprintf(out, 6, "%02u:%02u", (unsigned)(minutes / 60) % 100, (unsigned)(minutes % 60));
}