finish most user menu;

only checkout need to be done;
clean up, better interface;
improve user experience.

.gitignore

@@ -1,3 +1,4 @@
 main.exe
 .VSCodeCounter/*
 .vscode/*
+.vscode/settings.json

menu.h

@@ -20,7 +20,8 @@ int user_choices(){
     printf("1. Admin\n");
     printf("2. Normal User\n");
     printf("3. Exit\n");
-    
+    printf("Enter your choice: ");
+    fflush(stdin);
     scanf("%d", &choice);
     
     return choice;

normal_user.h

@@ -79,6 +79,7 @@ int normal_menu_user_choices(){
     printf("3. Self help sale system\n");
     printf("4. Exit\n");
     printf("Enter your choice: ");
+    fflush(stdin);
     scanf("%d", &choice);
     return choice;
 }
@@ -119,6 +120,7 @@ void list_page(struct inventory db,struct Map* map,int row){//user for showing l
     bool valid = true; 
     do{
         printf("Enter your choice: ");
+        fflush(stdin);
         scanf("%d", &choice);
         if(choice <=8 && choice > 0){
             printf("sorting...\n");
@@ -129,6 +131,7 @@ void list_page(struct inventory db,struct Map* map,int row){//user for showing l
             page--;
         }else if(choice == page_size+5){
             printf("Enter page size: ");
+            fflush(stdin);
             scanf("%d", &page_size);
             total_pages = ceil(row / page_size);
         }else if(choice >= 9 && choice < row+9){
@@ -236,6 +239,7 @@ void search_item(){
         printf("0 exit\n");
         printf("1 search\n");
         printf("select your choice: ");
+        fflush(stdin);
         scanf("%d", &breakout);
         fflush(stdin);
         if(breakout == 1 || breakout == 0){
@@ -265,18 +269,42 @@ void search_item(){
 
 
 char* prompt_search(){
-    printf("Enter search string:(largest length 100) ");
+    printf("Enter search string:(largest length 100)(case insesitive)\n");
     char* searchstr = malloc(sizeof(char) * 100);
+    fflush(stdin);
     scanf("%s", searchstr);
     return searchstr;
 }
+//check if strcasestr is define in current environment
+//if not, define it
+#ifndef HAVE_STRCASESTR
+char *strcasestr(const char *s, const char *find)
+{
+char c, sc;
+size_t len;
+
+if ((c = *find++) != 0) {
+c = tolower((unsigned char)c);
+len = strlen(find);
+do {
+do {
+if ((sc = *s++) == 0)
+return (NULL);
+} while ((char)tolower((unsigned char)sc) != c);
+} while (strncasecmp(s, find, len) != 0);
+s--;
+}
+return ((char *)s);
+}
+#endif
+
 
 struct Map* searchItems(struct inventory db, char* searchstr){
     struct Map* map = malloc(sizeof(struct Map) * (db.db.row_count+1));
     int k = 1;
     for (int i = 0; i < db.db.row_count; i++){
         map[k].key = i;
-        if(strstr(db.row[i].product,searchstr) != NULL){
+        if(strcasestr(db.row[i].product,searchstr) != NULL){
             
             map[k].value = (void*)db.row[i].product;
             k++;
@@ -309,6 +337,7 @@ void self_help_sale_system(){
     //options
     int breakout = 0;
     int choice = self_choice();
+    check = false;
     switch (choice)
     {
     case 1:
@@ -318,6 +347,7 @@ void self_help_sale_system(){
     case 2:
         cart = list_cart(cart);
         check = true;
+        break;
     default:
         break;
     }
@@ -332,11 +362,11 @@ int self_choice(){
         welcome_message();
         printf("0 exit\n");
         printf("1 scan barcode\n");
-        printf("2 cart\n");
+        printf("2 cart/checkout\n");
-        printf("3 checkout\n");
         printf("select an option: ");
+        fflush(stdin);
         scanf("%d", &choice);
-        if(choice <= 3 || choice >= 0){
+        if(choice <= 2 || choice >= 0){
             valid = true;
         }else{
             printf("Invalid choice\n");
@@ -361,6 +391,7 @@ struct cart* Cartappend(struct cart* cart,struct inventory_row* row,int quantity
         temp->next->quantity = quantity;
         temp->next->next = NULL;
     }
+
     return cart;
 }
 
@@ -402,6 +433,38 @@ struct cart* Cartupdate(struct cart* cart,int index,int quantity){
     }
 }
 
+struct inventory_row* Cartget(struct cart* cart,int index){
+    if (cart == NULL){
+        return NULL;
+    }else{
+        struct cart* temp = cart;
+        if (index == 0){
+            return cart->row;
+        }else{
+            for (int i = 0; i < index-1; i++){
+                temp = temp->next;
+            }
+            return temp->next->row;
+        }
+    }
+}
+
+int Cartqty(struct cart* cart,int index){
+    if (cart == NULL){
+        return 0;
+    }else{
+        struct cart* temp = cart;
+        if (index == 0){
+            return cart->quantity;
+        }else{
+            for (int i = 0; i < index-1; i++){
+                temp = temp->next;
+            }
+            return temp->next->quantity;
+        }
+    }
+}
+
 //scan barcode
 struct inventory_row* find_barcode(struct inventory db,long barcode);
 long prompt_barcode();
@@ -411,18 +474,37 @@ struct cart* scan_barcode(struct cart* cart,struct inventory db){
     printf("matching...\n");
     struct inventory_row* row = find_barcode(db,barcode);
     if(row != NULL){
-        printf("product: %s\n",row->product);
+        int quantity = 0; 
-        printf("price: %.2f\n",row->price);
+        char choice = 'n';
-        printf("Enter quantity: ");\
+        do{
-        int quantity = 0;
+            system("cls");    
-        scanf("%d", &quantity);
+            printf("product: %s\n",row->product);
-        if(quantity > 0){
+            printf("price: %.2f\n",row->price);
+            printf("Enter quantity(0 to cancel)\n>");\
+            fflush(stdin);
+            scanf("%d", &quantity);
+            fflush(stdin);
+            if(quantity == 0){
+                printf("cancelled\n");
+                printf("press any key to continue\n");
+                fflush(stdin);
+                getchar();
+                return cart;
+            }
+            printf("Are you sure you want to add this item to cart?(y/n)");
+            scanf("%c", &choice);
+        }while(choice != 'y');
+        if(quantity != 0){
             cart = Cartappend(cart,row,quantity);
+            printf("added to cart\n");
+        }
     }else{//empty search
         printf("Unable to match or invalid input\n");
 
     }
-    }while(true);//break on top
+    printf("press any key to continue\n");
+    fflush(stdin);
+    getchar();
     return cart;
 }
 
@@ -430,15 +512,14 @@ struct cart* scan_barcode(struct cart* cart,struct inventory db){
 long prompt_barcode(){
     printf("Please scan the qr code(or input the barcode ) ");
     long barcode;
-    scanf("%ld", barcode);
+    fflush(stdin);
+    scanf("%ld", &barcode);
     return barcode;
 }
 
 struct inventory_row* find_barcode(struct inventory db,long barcode){
     struct inventory_row row;
-    printf("s");
     for (int i = 0; i < db.db.row_count; i++){
-    printf("s");
         printf("%ld\n",db.row[i].barcode);
         if(db.row[i].barcode == barcode){
             
@@ -451,6 +532,7 @@ struct inventory_row* find_barcode(struct inventory db,long barcode){
 
 //list cart
 struct cart* cart_control(struct cart* cart,int index);
+struct cart* checkout(struct cart* cart);
 struct cart* list_cart(struct cart* cart){
         int choice = 0;
     do{
@@ -463,65 +545,108 @@ struct cart* list_cart(struct cart* cart){
             printf("Cart is empty\n");
         }else{
             struct cart* temp = cart;
-            while(temp != NULL){
+            while(temp != NULL){//show cart
                 int qty = temp->quantity;
                 double price = temp->row->price * qty;
                 total_price += price;
-                printf("%d product:%s price:$%lf qty:%d\n",i,temp->row->product,price,qty);
+                printf("%d product:%s price:$%lf\n quantity:%d\n",i,temp->row->product,price,qty);
+                printf("<------------------------>\n");
                 temp = temp->next;
                 i++;
             }
             printf("Total price: $%.2f\n",total_price);
+            printf("%d checkout\n",i);
         }
         do{
-            printf("input the corrisponding value for more action\n");
+            printf("input the corrisponding value for more action\n>");
+            fflush(stdin);
             scanf("%d", &choice);
-            if(choice >0 && choice <= i){
+            if(choice >0 && choice < i){
                 cart = cart_control(cart,choice);
-            }   
+            }else if(choice == i && cart != NULL){
-        }while(choice >0 && choice < i);
+                cart = checkout(cart);
+
+            }
+        }while(choice <0 || choice > i);
     }while(choice != 0);
     return cart;
 }
 struct cart* update_cart(struct cart* cart,int index);
 struct cart* cart_control(struct cart* cart,int index){
     int choice = 0;
+    struct inventory_row* row = Cartget(cart,index-1);
+    int quantity = Cartqty(cart,index-1);
     do{
         system("cls");
         welcome_message();
         printf("0 exit\n");
         printf("1 remove\n");
         printf("2 edit quantity\n");
-        bool check = false;
+        printf("product: %s\n",row->product);
+        printf("price: %.2f\n",row->price);
+        printf("quantity: %d\n",quantity);
+        bool check;
         do{
+            check = true;
+            printf("select an option: ");
+            fflush(stdin);
             scanf("%d", &choice);
             if(choice == 1){
                 cart = Cartremove(cart,index-1);
-                check = true;
+                printf("Remove successful\n");
+                printf("press any key to continue\n");
+                fflush(stdin);
+                getchar();
             }else if(choice == 2){
                 cart = update_cart(cart,index);
-                check = true;
+                printf("Update successful\n");
+                printf("press any key to continue");
+                fflush(stdin);
+                getchar();
             }else if(choice != 0){
                 printf("Invalid choice\n");
                 check = false;
             }
         }while(!check);
-    }while(choice != 0);
+    }while(choice < 0 || choice > 2);
     return cart;
 }
 
 struct cart* update_cart(struct cart* cart,int index){
     system("cls");
     welcome_message();
-    printf("enter the new quantity: ");
+    char choice;
-    int quantity = 0;
+    do{
-    scanf("%d", &quantity);
+        int quantity = 0;
-    if(quantity > 0){
+        printf("enter the new quantity: ");
-        cart = Cartupdate(cart,index-1,quantity);
+        fflush(stdin);
-    }else if (quantity == 0){
+        scanf("%d", &quantity);
-        cart = Cartremove(cart,index-1);
+        printf("Are you sure you want to update this item?(y/n/e to exit)");
-    }else{
+        fflush(stdin);
-        printf("Invalid quantity\n");
+        scanf("%c", &choice);
-    }
+        if(choice == 'y'){
+            
+            if(quantity != 0){
+                cart = Cartupdate(cart,index-1,quantity);
+            }else if (quantity == 0){
+                cart = Cartremove(cart,index-1);
+            }
+        }
+    }while(choice != 'y' && choice != 'e');
+    return cart;
+}
+
+
+
+//Checkout
+//TODO checkout
+
+struct cart* checkout(struct cart* cart){
+//TODO:write db func for transaction
+//TODO:write db func for user
+//TODO:update stock
+    system("cls");
+    welcome_message();
+   
     return cart;
 }