Add config file support

Gtk4/gtk153_time_reminder/src/MyReminder.cpp

@@ -1,14 +1,58 @@
 #include "MyReminder.h"
+#include <fstream>
 #include "timer.h"
 
 struct _MyReminder
 {
     GtkApplicationWindow parent_instance;
     GtkWidget *time_label;
+    int year, month, day;
+    std::string color;
 };
 
 G_DEFINE_TYPE(MyReminder, my_reminder, GTK_TYPE_APPLICATION_WINDOW)
 
+static void load_json_data(MyReminder *self)
+{
+    std::fstream json_file;
+    json json_data;
+    std::string default_color("blue");
+
+    // Open json file for data
+    json_file.open("config.json", std::ios_base::in);
+
+    // Load json data
+    if (json_file.is_open())
+    {
+        json_data = json::parse(json_file);
+    }
+    else
+    {
+        // Json file not exist, load default config
+        self->color = default_color;
+        self->year = 2023;
+        self->month = 12;
+        self->day = 23;
+    }
+
+    if (!json_data.empty()){
+        // Get json data
+        std::string tmp_color = json_data["color_set"];
+        self->color = tmp_color;
+        self->year = json_data["year"];
+        self->month = json_data["month"];
+        self->day = json_data["day"];
+    }
+    else
+    {
+        // No json data, load default config
+        self->color = default_color;
+        self->year = 2023;
+        self->month = 12;
+        self->day = 23;
+    }
+}
+
 static void my_reminder_init(MyReminder *self)
 {
     // Set properties of window
@@ -16,16 +60,24 @@ static void my_reminder_init(MyReminder *self)
     gtk_window_set_default_size(GTK_WINDOW(self), 240, 200);
     gtk_window_set_title(GTK_WINDOW(self), "Reminder");
 
+    // Load data from json file
+    load_json_data(self);
+
     // Create and add a label
     self->time_label = gtk_label_new(" ");
 
     // Get time duration
     char time_str[57];
-    int time = get_time_duration(2023, 12, 23);
-    if(time >= 0){
-        snprintf(time_str, sizeof(time_str), "<span foreground=\"blue\" size='16pt'>%d</span>\nDays Left", time);
-    }else{
-        strncpy(time_str, "<span foreground=\"blue\" size='16pt'>Time is out!</span>", 13);
+    int time = get_time_duration(self->year, self->month, self->day);
+    if (time >= 0)
+    {
+        snprintf(time_str, sizeof(time_str),
+                 "<span foreground=\"%s\" size='16pt'>%d</span>\nDays Left", 
+                 self->color.c_str(), time);
+    }
+    else
+    {
+        strncpy(time_str, "<span foreground=\"red\" size='16pt'>Time is out!</span>", 56);
     }
 
     // Text style of the label