transaction_manager.c

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#include "../include/blood_manager.h"
#include "../include/transaction_manager.h"
#include "../include/misc.h"
#include "../include/hospital_manager.h"

bool logTransaction(TransactionType type, const char* name, uint32_t bloodId, uint32_t quantity, const char* date, const char* token) {
    errno = 0;
    FILE* file = fopen("resources/db/transactions.log", "a");
    if (!file) {
        if (errno != ENOENT) {
            printf("Error opening transaction log file: %s\n", strerror(errno));
        }
        return false;
    }
 
    if (containsPipe(name)) {
        printf("Error: Entity name cannot contain a pipe character.\n");
        return false;
    }
 
    if (type != BUY && type != SELL) {
        printf("Error: Invalid transaction type.\n");
        return false;
    }
 
    if (!isValidBloodGroup(bloodId)) {
        printf("Error: Invalid blood group.\n");
        return false;
    }
 
    if (strcmp(name, "") == 0 || quantity <= 0) {
        printf("Error: Invalid transaction parameters.\n");
        return false;
    }
 
    if (!isValidDate(date)) {
        printf("Error: Invalid date format.\n");
        return false;
    }
 
    if (token) {
        fprintf(file, "%s|%s|%u|%u|%s|%s\n", (type == BUY ? "Buy" : "Sell"), name, bloodId, quantity, date, token);
    } else {
        fprintf(file, "%s|%s|%u|%u|%s\n", (type == BUY ? "Buy" : "Sell"), name, bloodId, quantity, date);
    }
 
    fclose(file);
    return true;
}

bool addTransaction(TransactionType type, const char* name, uint32_t bloodId, uint32_t quantity) {
    if (strcmp(name, "") == 0 || quantity <= 0) {
        printf("Error: Invalid transaction parameters.\n");
        return false;
    }
 
    if (containsPipe(name)) {
        printf("Error: Entity name cannot contain a pipe character.\n");
        return false;
    }
 
    if (type != BUY && type != SELL) {
        printf("Error: Invalid transaction type.\n");
        return false;
    }
 
    if (!isBloodAvailable(&bloodId, type)) {
        printf("No stock available for blood group: %s\n", getBloodGroupById(bloodId));
        return false;
    }
 
    if (type == BUY) {
        if (!validateHospitalCode(name)) {
            printf("Error: Invalid hospital code.\n");
            return false;
        }
    }
 
    char date[MAX_TRANSACTION_DATE_LENGTH];
    char token[MAX_TRANSACTION_TOKEN_LENGTH] = "";
 
    if (type == SELL) {
        printf("Enter the date and time of donation (YYYY-MM-DD): ");
        fgets(date, sizeof(date), stdin);
        date[strcspn(date, "\n")] = 0;
        if (!isValidDate(date)) {
            printf("Error: Invalid date format.\n");
            return false;
        }
        formatDate(date);
    } else {
        BloodStock* stock = bloodHead;
        while (stock != NULL) {
            if (stock->id == bloodId) {
                if (stock->quantity < quantity) {
                    printf("Not enough stock for blood group: %s. Available quantity: %u\n", getBloodGroupById(bloodId), stock->quantity);
                    return false;
                }
 
                stock->quantity -= quantity;
                saveBloodGroups();
                break;
            }
            stock = stock->next;
        }
        time_t now = time(NULL);
        strftime(date, sizeof(date), "%Y-%m-%d", localtime(&now));
    }
 
    if (type == SELL) {
        srand(time(NULL));
        sprintf(token, "TOKEN_%d", rand() % 10000);
        printf("Sell token generated for %s: %s\n", name, token);
    }
 
    if (!logTransaction(type, name, bloodId, quantity, date, type == SELL ? token : NULL)) {
        return false;
    }
 
    return true;
}

void displayTransactions(void) {
    errno = 0;
    FILE* file = fopen("resources/db/transactions.log", "r");
    if (!file) {
        if (errno == ENOENT) {
            printf("No registered transactions found.\n");
        } else {
            printf("Error opening transaction log file: %s\n", strerror(errno));
        }
        return;
    }
 
    char line[256];
    bool hasLogs = false;
    bool firstLog = true;
    char prevLine[256] = { 0 };
 
    while (fgets(line, sizeof(line), file) != NULL) {
        char type[MAX_TRANSACTION_TOKEN_LENGTH] = "";
        char name[MAX_TRANSACTION_TOKEN_LENGTH] = "";
        uint32_t bloodId = 0;
        uint32_t quantity = 0;
        char date[MAX_TRANSACTION_TOKEN_LENGTH] = "";
        char token[MAX_TRANSACTION_TOKEN_LENGTH] = "";
 
        if (firstLog) {
            printf("\nRegistered Transactions:\n");
            firstLog = false;
        }
 
        if (sscanf(line, "%[^|]|%[^|]|%u|%u|%[^|]|%[^|\n]",
            type,
            name,
            &bloodId,
            &quantity,
            date,
            token) >= 5) {
 
            hasLogs = true;
 
            if (prevLine[0] != '\0') {
                printf("\t----------------------------------\n");
            }
 
            printf("\tType: %s\n"
                "\tEntity: %s\n"
                "\tBlood Group: %s\n"
                "\tQuantity: %u\n"
                "\tDate: %s",
                type,
                name,
                getBloodGroupById(bloodId),
                quantity,
                date);
 
            if (token[0] != '\0') {
                printf("\n\tToken: %s\n", token);
            }
 
            strncpy(prevLine, line, sizeof(prevLine) - 1);
            prevLine[sizeof(prevLine) - 1] = '\0';
        }
    }
 
    if (!hasLogs) {
        printf("No registered transactions found.\n");
    }
 
    fclose(file);
}