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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define numbOfList 4
#define numbOfChars 50


struct symbolInfo{
    char name[numbOfChars];
    char ID[numbOfChars];
    char CGPA[numbOfChars];

    struct symbolInfo *next;
}*symbolTable[numbOfList];


void displayAll(){

    printf("Displaying the list :- \n");
    struct symbolInfo *isNull;

    int i;
    for(i=0; i<numbOfList;i++){
        isNull=symbolTable[i];

        printf("\n%d No. list :  ", i+1);
        while(isNull!=NULL){
            printf("<%s,%s, %s>  ",isNull->name, isNull->ID);
            isNull=isNull->next;
        }
    }

    printf("\n");
}


void insert(char setName[numbOfChars], char setID[numbOfChars], int hashKey){
    struct symbolInfo *isNull;
    struct symbolInfo *temp;
    isNull = symbolTable[hashKey];
    temp = malloc(sizeof(struct symbolInfo));
    temp -> next = NULL;
    strcpy(temp->name, setName);
    strcpy(temp->ID, setID);
    symbolTable[hashKey] = temp;
    symbolTable[hashKey] ->next = isNull;       //assume, symbolTable[hashKey] == head
}





void deleteFromList(char getName[numbOfChars], char getID[numbOfChars]){
    struct symbolInfo *isNull;
    struct symbolInfo *prev;

    int listNumber = getHashKey(getName);
    isNull = symbolTable[listNumber];

    if((strcmp(symbolTable[listNumber]->name,getName) == 0)&& (strcmp(symbolTable[listNumber]->ID,getID)== 0)){
        symbolTable[listNumber] = isNull->next;
    }
    else{
        while(isNull!=NULL){
            if((strcmp(isNull->name,getName) == 0) && (strcmp(isNull->ID,getID) == 0)){
                prev->next=isNull->next;
                break;
            }
            prev=isNull;
            isNull=isNull->next;
        }
    }
}


int getHashKey(char value[numbOfChars]){
    int total = 0;
    int i;

    for(i=0; i<strlen(value); i++){
        total = total + value[i];
    }

    return total%numbOfList;
}


void menu(){

    int choice;

    while(1){
        printf("-------Menu------\n");
        printf("1.  Insert\n");
        printf("3.  Delete\n");
        printf("5.  Show lists\n");
        printf("6.  Exit\n");
        printf("-----------------\n\n");

        printf("Enter choice: ");
        scanf("%d", &choice);
        printf("\n");

        if(choice == 6){
            break;
        }
        else if (choice == 1){

            printf("Keep inserting. Enter 0 in both cases to stop\n\n");

            while(1){
                char setName[numbOfChars];
                char setID[numbOfChars];
                int hashKey;

                printf("Enter the name : ");
                scanf("%s", setName);
                printf("Enter class type : ");
                scanf("%s", setID);
                printf("\n");

                if((strcmp(setName, "0") == 0) && (strcmp(setID, "0") == 0)){
                    break;
                }

                hashKey = getHashKey(setName);
                insert(setName, setID, hashKey);
            }
        }

        else if (choice == 3){

            char getName[numbOfChars];
            char getID[numbOfChars];

            printf("Enter the name for deleting: ");
            scanf("%s", getName);
            printf("Enter class type for deleting: ");
            scanf("%s", getID);
            printf("\n");

            deleteFromList(getName, getID);
        }

        else if (choice == 5){

            displayAll();
        }

        printf("\n\n");
    }
}


int main(){

    menu();

    printf("\n\n\n");
    return 0;
}