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


/*Menu Macros:*/
#define OPTION_ADD 1
#define OPTION_LIST 2
#define OPTION_DISPLAY_TOTAL_VALUE 3
#define OPTION_SEARCH_ID 4
#define OPTION_SEARCH_NAME 5
#define OPTION_DISPLAY_CHEAPEST 6
#define OPTION_DISPLAY_NEED_SUPPLY 7
#define OPTION_MODIFY_PRICE 8
#define OPTION_DELETE 9
#define OPTION_EXIT 10

/*Max buffer macro*/
#define MAX_BUFFER 256

/*File name*/
#define FILE_NAME "input.txt"

typedef struct{
    int id;
    char name[32];
    char features[32];
    int quantity;
    int price;
}product;



/*Header area*/
void menu();
void add();

/*Main function*/
int main(){
    menu();
    return 0;
}

/*Implementation area*/
void add(){
    char buffer[32];
    product p;

    printf("Please add an id:\n");
    fseek(stdin, 0, SEEK_END);
    scanf("%d",&(p.id));

    printf("Please add a name:\n");
    fseek(stdin, 0, SEEK_END);
    fgets(buffer,32,stdin);
    buffer[strlen(buffer)-1]='\0';
    strncpy(p.name,buffer,32);

    printf("Please add the features of the product:\n");
    fseek(stdin, 0, SEEK_END);
    fgets(buffer,32,stdin);
    buffer[strlen(buffer)-1]='\0';
    strncpy(p.features,buffer,32);

    printf("Please add a quantity:\n");
    fseek(stdin, 0, SEEK_END);
    scanf("%d",&(p.quantity));

    printf("Please add a price:\n");
    fseek(stdin, 0, SEEK_END);
    scanf("%d",&(p.price));


    FILE *out=fopen(FILE_NAME,"a");
    fprintf(out,"%d,%s,%s,%d,%d\n",p.id,p.name,p.features,p.quantity,p.price);
    fclose(out);
}

void list(){
    FILE *in=fopen(FILE_NAME,"r");
    char buffer[256];
    char *ptr;
    while(fgets(buffer,256,in)!=NULL){
        ptr=strtok(buffer,",");
        printf("ID:%s\n",ptr);
        ptr=strtok(NULL,",");
        printf("Name:%s\n",ptr);
        ptr=strtok(NULL,",");
        printf("Features:%s\n",ptr);
        ptr=strtok(NULL,",");
        printf("Quantity:%s\n",ptr);
        ptr=strtok(NULL,",");
        printf("Price:$%s\n\n",ptr);
    }
    fclose(in);
}

void total_value(){
    FILE *in=fopen(FILE_NAME,"r");
    char buffer[256];
    char *ptr;
    int total=0;
    int aux_q,aux_p;
    while(fgets(buffer,256,in)!=NULL){
        ptr=strtok(buffer,",");
        ptr=strtok(NULL,",");
        ptr=strtok(NULL,",");
        ptr=strtok(NULL,",");
        aux_q=atoi(ptr);
        ptr=strtok(NULL,",");
        aux_p=atoi(ptr);
        total+=aux_p*aux_q;
    }
    printf("Total price:%d\n",total);
    fclose(in);
}

void menu(){
    char *buffer=malloc(MAX_BUFFER*sizeof(char));
    int option=-1;
    do{
        printf("%d. Add a product\n",OPTION_ADD);
        printf("%d. List products\n",OPTION_LIST);
        printf("%d. Display total value\n",OPTION_DISPLAY_TOTAL_VALUE);
        printf("%d. Search by id\n",OPTION_SEARCH_ID);
        printf("%d. Search by name\n",OPTION_SEARCH_NAME);
        printf("%d. Display the cheapest\n",OPTION_DISPLAY_CHEAPEST);
        printf("%d. Display the ones that need to be resupplied\n",OPTION_DISPLAY_NEED_SUPPLY);
        printf("%d. Modify the price/quantity\n",OPTION_MODIFY_PRICE);
        printf("%d. Delete product\n",OPTION_DELETE);
        printf("%d. Exit\n",OPTION_EXIT);

        fseek(stdin, 0, SEEK_END);
        fgets(buffer,MAX_BUFFER,stdin);
        option=atoi(buffer);
        switch(option){
            case OPTION_ADD:
                printf("Adding a new product...\n");
                add();
                break;
            case OPTION_LIST:
                printf("Listing products...\n");
                list();
                break;
            case OPTION_DISPLAY_TOTAL_VALUE:
                printf("Displaying the total value...\n");
                total_value();
                break;
            case OPTION_SEARCH_ID:
                printf("Searching by id...\n");
                break;
            case OPTION_SEARCH_NAME:
                printf("Searching by name...\n");
                break;
            case OPTION_DISPLAY_CHEAPEST:
                printf("Displaying the cheapest product...\n");
                break;
            case OPTION_DISPLAY_NEED_SUPPLY:
                printf("Displaying the needed supplies...\n");
                break;
            case OPTION_MODIFY_PRICE:
                printf("Modifying the price...\n");
                break;
            case OPTION_DELETE:
                printf("Deleting a product...\n");
                break;
            case OPTION_EXIT:
                printf("Exiting...\n");
                break;
            default:
                printf("Please Enter a valid option!\n");
        }
    }while(option!=OPTION_EXIT);
    free(buffer);
}