ui_menu.c

#include <ncurses.h>

#include "custom_include/memory_info.h"
#include "custom_include/process_info.h"
#include "custom_include/sys_info.h"
#include "custom_include/battery_info.h"

void ui_menu() {
    initscr();
    noecho();
    curs_set(0); 
    
    timeout(1000);  // refresh every 1 sec
    int mode = 0; // to be able to refresh menu items

    keypad(stdscr, TRUE); // enable arrow keys

    char *choices[] = { "Processes", "CPU Usage", "Memory Info", "Battery Info", "Exit" }; // options in menu
    size_t len_menu = sizeof choices/ sizeof(char *);
    int choice;
    int highlight = 0;

    while(1) {
        clear();
        // menu
        if (mode == 0) {
            for(int i = 0; i < len_menu; i++) {
                mvprintw(1, 5, "--- ProcView Dashboard ---");
                if(i == highlight) 
                    attron(A_REVERSE); // highlight the selected option
                
                mvprintw(i + 3, 5, "%s", choices[i]);
                attroff(A_REVERSE);
            }
        } else { // DATA VIEW MODE
            mvprintw(1, 5, "Monitoring: %s (Press 'b' to go back)", choices[highlight]);
            
            if (highlight == 0) get_process_info();
            else if (highlight == 1) get_sys_info();
            else if (highlight == 2) get_memory_info();
            else if (highlight == 3) get_battery_info();
            
            mvprintw(LINES - 1, 5, "Last Update: [Live]");
        }

        // get user choice
        choice = getch();

        if (mode == 0) switch(choice) {
            case KEY_UP:
                highlight = (highlight == 0) ? len_menu-1 : highlight - 1;
                break;
            case KEY_DOWN:
                highlight = (highlight == len_menu-1) ? 0 : highlight + 1;
                break;
            case KEY_RIGHT:  // Fall through
            case 10:        // Enter key

                clear();   // clear ui
                mode = 1;  // change ui 

                if(highlight == len_menu-1) // Exit selected
                    goto end;

                break;
            
        } else {
            if (choice == 'b' || choice == 10 || choice == KEY_LEFT) { // 'b' or Enter to go back
                clear();
                refresh();
                mode = 0;
            }
        }
        refresh();
    }

end:
    endwin(); // restore terminal
    return;
}