Eat don't eat watch now actually works

src/c/main.c

@@ -1,5 +1,4 @@
 #include "main.h"
-#include "message_keys.auto.h"
 #include <pebble.h>
 
 static Window *s_main_window;
@@ -11,7 +10,7 @@ static TextLayer *s_eat_layer;
 static ClaySettings settings;
 
 // Initialize the default settings
-static void prv_default_settings() {
+static void default_settings() {
   settings.BackgroundColor = GColorBlack;
   settings.ForegroundColor = GColorWhite;
   settings.FastBegin = "12:00";
@@ -19,19 +18,20 @@ static void prv_default_settings() {
 }
 
 // Read settings from persistent storage
-static void prv_load_settings() {
+static void load_settings() {
   // Load the default settings
-  prv_default_settings();
+  default_settings();
   // Read settings from persistent storage, if they exist
   persist_read_data(SETTINGS_KEY, &settings, sizeof(settings));
 }
 
 // Save the settings to persistent storage
-static void prv_save_settings() {
+static void save_settings() {
   persist_write_data(SETTINGS_KEY, &settings, sizeof(settings));
   // Update the display based on new settings
   update_time();
 }
+
 // Handle the response from AppMessage
 static void inbox_recieved_callback(DictionaryIterator *iter, void *context) {
   // Background Color
@@ -59,13 +59,13 @@ static void inbox_recieved_callback(DictionaryIterator *iter, void *context) {
   }
 
   // Save the new settings to persistent storage
-  prv_save_settings();
+  save_settings();
 }
 
 static void update_time() {
   // Get a tm structure
-  time_t temp = time(NULL);
-  struct tm *tick_time = localtime(&temp);
+  time_t now = time(NULL);
+  struct tm *tick_time = localtime(&now);
 
   // Write the current hours and minutes into a buffer
   static char s_time_buffer[8];
@@ -82,9 +82,17 @@ static void update_time() {
   // Display the date
   text_layer_set_text(s_date_layer, s_date_buffer);
 
-  // TODO: compare the time and change accordingly
   static const char eatmsg[] = "Eat";
+  static const char donteatmsg[] = "Don't Eat";
+
+  time_t fast_start = parse_time_str(settings.FastBegin);
+  time_t fast_end = parse_time_str(settings.FastEnd);
+
+  if (now >= fast_start && now < fast_end) {
     text_layer_set_text(s_eat_layer, eatmsg);
+  } else {
+    text_layer_set_text(s_eat_layer, donteatmsg);
+  }
 }
 
 static void tick_handler(struct tm *tick_time, TimeUnits units_changed) {
@@ -136,7 +144,7 @@ static void main_window_unload(Window *window) {
 }
 
 static void init() {
-  prv_load_settings();
+  load_settings();
   app_message_register_inbox_received(inbox_recieved_callback);
   app_message_open(128, 128);
 
@@ -160,3 +168,25 @@ int main(void) {
   app_event_loop();
   deinit();
 }
+
+static time_t parse_time_str(const char *time_string) {
+  if (time_string[2] != ':')
+    return (time_t)-1;
+
+  int h = (time_string[0] - '0') * 10 + (time_string[1] - '0');
+  int m = (time_string[3] - '0') * 10 + (time_string[4] - '0');
+
+  if (h < 0 || h > 23)
+    return (time_t)-1;
+  if (m < 0 || m > 59)
+    return (time_t)-1;
+
+  time_t now = time(NULL);
+  tm *time = localtime(&now);
+
+  time->tm_hour = h;
+  time->tm_min = m;
+  time->tm_sec = 0;
+
+  return mktime(time);
+}

src/c/main.h

@@ -11,9 +11,11 @@ typedef struct ClaySettings {
   char *FastEnd;
 } __attribute__((__packed__)) ClaySettings;
 
-static void prv_default_settings();
-static void prv_load_settings();
-static void prv_save_settings();
+static void default_settings();
+static void load_settings();
+static void save_settings();
+
+static time_t parse_time_str(const char *time_string);
 
 int main(void);
 static void inbox_recieved_callback(DictionaryIterator *iter, void *context);