From d84bb7ac4b3bf8085fc41a7c5e979cd1990936b9 Mon Sep 17 00:00:00 2001
From: Camden Dixie O'Brien <cdo@wip.sh>
Date: Wed, 17 May 2023 16:04:10 +0100
Subject: [PATCH] Add support for getting day of the week to time module

---
 components/time/time_manager.c | 47 ++++++++++++++++++++++++++++++++--
 components/time/time_manager.h | 20 +++++++++++++++
 2 files changed, 65 insertions(+), 2 deletions(-)

diff --git a/components/time/time_manager.c b/components/time/time_manager.c
index b6738f8..c257942 100644
--- a/components/time/time_manager.c
+++ b/components/time/time_manager.c
@@ -118,6 +118,11 @@ static int date_command_func(int argc, char **argv)
 		printf("%04u-%02u-%02u\n", date.year, date.month, date.day);
 		return 0;
 	} else if (argc == 2) {
+		if (strcmp(argv[1], "week-day") == 0) {
+			const WeekDay day = get_week_day();
+			printf("%s\n", week_day_name(day));
+			return 0;
+		}
 		Date date;
 		const int result = sscanf(
 		    argv[1], "%04u-%02u-%02u", &date.year, &date.month, &date.day);
@@ -190,8 +195,8 @@ void time_manager_init(void)
 	    "time", "Get, set or store the time", "time [HH:MM] OR time store",
 	    time_command_func);
 	console_register(
-	    "date", "Get or set the date", "date [yyyy-mm-dd]",
-	    date_command_func);
+	    "date", "Get or set the date, or get the day of the week",
+	    "date [yyyy-mm-dd] OR date week-day", date_command_func);
 	console_register(
 	    "sntp", "Manage SNTP", "sntp <status|restart|stop>",
 	    sntp_command_func);
@@ -274,3 +279,41 @@ void set_date(Date date)
 	tv.tv_sec = mktime(&timeinfo);
 	settimeofday(&tv, NULL);
 }
+
+WeekDay get_week_day(void)
+{
+	struct timeval tv;
+	gettimeofday(&tv, NULL);
+	struct tm timeinfo;
+	(void)localtime_r(&tv.tv_sec, &timeinfo);
+	if (timeinfo.tm_wday == 0)
+		return WEEK_DAY_SUNDAY;
+	else
+		return (WeekDay)(timeinfo.tm_wday - 1);
+}
+
+const char *week_day_name(WeekDay day)
+{
+	switch (day) {
+	case WEEK_DAY_MONDAY:
+		return "Monday";
+	case WEEK_DAY_TUESDAY:
+		return "Tuesday";
+	case WEEK_DAY_WEDNESDAY:
+		return "Wednesday";
+	case WEEK_DAY_THURSDAY:
+		return "Thursday";
+	case WEEK_DAY_FRIDAY:
+		return "Friday";
+	case WEEK_DAY_SATURDAY:
+		return "Saturday";
+	case WEEK_DAY_SUNDAY:
+		return "Sunday";
+
+	default:
+		ESP_LOGE(
+		    TAG, "Invalid day of the week passed to %s(): %u", __func__,
+		    (unsigned)day);
+		return "INVALID";
+	}
+}
diff --git a/components/time/time_manager.h b/components/time/time_manager.h
index 123f60c..305b544 100644
--- a/components/time/time_manager.h
+++ b/components/time/time_manager.h
@@ -17,6 +17,16 @@ typedef struct {
 	unsigned day;
 } Date;
 
+typedef enum {
+	WEEK_DAY_MONDAY,
+	WEEK_DAY_TUESDAY,
+	WEEK_DAY_WEDNESDAY,
+	WEEK_DAY_THURSDAY,
+	WEEK_DAY_FRIDAY,
+	WEEK_DAY_SATURDAY,
+	WEEK_DAY_SUNDAY,
+} WeekDay;
+
 /**
  * Initialize the time module.
  */
@@ -42,4 +52,14 @@ Date get_date(void);
  */
 void set_date(Date date);
 
+/**
+ * Get which day of the week it is.
+ */
+WeekDay get_week_day(void);
+
+/**
+ * Get the name of a day of the week.
+ */
+const char *week_day_name(WeekDay day);
+
 #endif