#include <stdio.h>

//Function declarations

int readLine(FILE* spInventory, int *part, int *dept, char *type, float *cost, int *qty);
float calcValue(float cost, int qty, char type, float* value, float* totA, float* totB);
void printLine(FILE* spReport, int *part, int *dept, char *type, float *cost, int *qty );

int main(void)
{
    // Local Declarations.
    FILE* spInventory;
    FILE* spReport;

    float cost;
    int qty;
    char type;
    float value;
    float totA;
    float totB;
    int part;
    int dept;

    // Statements
    printf("Processing data\n");
    if (!(spInventory = fopen("inventory.txt", "r")))
    {
        printf("\aError opening file\n");
        return 100;
    }
    if (!(spReport = fopen ("report.txt", "w")))
	   {
	    printf("\aError opening grades file\n");
	    return 102;
	   } // if open output

    while (readLine(spReport, &part, &dept, &type, &cost, &qty))
    {
        calcValue(cost,qty, type, &value, &totA, &totB);
        //printLine();
    }

    fclose(spInventory);
    fclose(spReport);

    printf("End data processing");

    return 0;
} //main

int readLine(FILE* spInventory, int *part, int *dept, char *type, float *cost, int *qty)
{
    //  Local Declarations
    int ioResult;

    ioResult = fscanf(spInventory, "%d %d %c %f %d\n", part, dept, type, cost, qty);

    if (ioResult == EOF)  //end of file, return false - no more to read
        return 0;
    else if (ioResult != 4) //error, return false - no more to read
    {
        printf("\aError reading data\n");
        return 0;
    }
    else  // if no error and not EOF, return true there's more to read
    {
    return 1;
    }
} // end of readLine

float calcValue(float cost, int qty, char type, float* value, float* totA, float* totB)
{
    *value = cost * qty;
    *totA = *totA + *value;
    *totB = *totB + *value;

    return 0;

}

void printLine(FILE* spReport, int *part, int *dept, char *type, float *cost, int *qty )
{
    fprintf(spReport, "%d %d %c %f %d", part, dept, type, cost, qty);
}