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/*Make a game play the slot machine, can
 * +read save game and read value from file 
 */

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

#define MIN_VALUE 1
#define MAX_VALUE 3
#define MONEY_START 10.00

float readValueFormFile(FILE *fptr);
int getInt(int, int);
int menu(FILE *fptr, float, int);
int makeRandom(int, int);
void separatingDigitsIntoArray(int, int, int three_digitNum[]);
int randomThree_digitNumber(int, int);
float playTheSlotMachine(float);
void saveMoney(FILE *fptr, float);

int main() {
    int isContinue = 1, times = 1;
    int choose;
    //declare pointer of file
    FILE *fptr;
    //read value of money form file
    float money = readValueFormFile(fptr);
    printf("You have $%.2f.\n", money);
    do {
        //call function menu, input choice
        choose = menu(fptr, money, times);
        switch (choose) {
            case 1:
                //play game the slot machine
                money = playTheSlotMachine(money);
                break;
            case 2:
                //Save money to file
                saveMoney(fptr, money);
                break;
            case 3:
                // print out money & break out of loop
                printf("Thank you for playing! You end with $%.2f!", money);
                isContinue = 0;
        }
        // number of time add 1
        times++;
    } while (isContinue == 1);
    return 0;
}

int getInt(int minValue, int maxValue) {
    int value;
    char check; //42a
    do {
        int rc = scanf("%d%c", &value, &check);
        fpurge(stdin);
        if (rc != 2 || check != '\n') {
            printf("Invalid value!\n");
        } else if (value < minValue || value > maxValue) {
            printf("Value out of range!\n");
        } else { // rc == 2 && check == '\n'
            return value;
            //break out of function
        }
    } while (1);
}

float readValueFormFile(FILE *fptr) {
    //file savegame.txt if it was made
    fptr = fopen("D:\\Aaa Subjects\\FU2\\LAB101\\CLAB\\C.L.P0003.cfffff\\savegame.txt", "r+");
    //check the existence of the file
    if (fptr == NULL) {
        //file not yet made --> make new file savegame.txt
        fptr = fopen("D:\\Aaa Subjects\\FU2\\LAB101\\CLAB\\C.L.P0003.cfffff\\savegame.txt", "w");
    }
    float money;
    //declare variable check to check the existence of file's data
    int check = fscanf(fptr, "%f", &money);
    if (check == -1) { // empty file -- > can't get value from file
        //if empty file , print $MONEY_START to file
        fprintf(fptr, "%f", MONEY_START);
        //assign value for variable money
        money = MONEY_START;
    }
    //close file fptr
    fclose(fptr);
    return money;
}

int menu(FILE *fptr, float money, int times) {
    int choose;
    if (money <= 0) {//check : if money <= 0,print MONEY_START to file for next time & end game
        saveMoney(fptr, MONEY_START);
        choose = 3;
    } else {
        printf("[%d]-Chose one of the following menu options: \n", times);
        printf("1) Play the slot machine.\n");
        printf("2) Save game.\n");
        printf("3) Cash out.\n");
        choose = getInt(MIN_VALUE, MAX_VALUE);
    }
    //return user's choice
    return choose;
}

void saveMoney(FILE *fptr, float money) {
    //open file savegame.txt to write value of money to this file
    fptr = fopen("D:\\Aaa Subjects\\FU2\\LAB101\\CLAB\\C.L.P0003.cfffff\\savegame.txt", "w");
    fprintf(fptr, "%f", money);
    fclose(fptr);
    printf("Your money have saved.\n");
}

int makeRandom(int minRand, int maxRand) {
    //make a random number by time
    srand((unsigned) time(NULL));
    //make a random number from minRand to maxRand
    int numRand = minRand + rand() % (maxRand + 1 - minRand);
    return numRand;
}

void separatingDigitsIntoArray(int intNum, int sizeOfArray, int three_digitNumber[]) {
    //separate digits of number to array three_digitNumber[] 
    for (int i = sizeOfArray - 1; i >= 0; i--) {
        three_digitNumber[i] = intNum % 10;
        intNum = intNum / 10;
    }
}

int randomThree_digitNumber(int minRand, int maxRand) {
    int three_digitNumber[3];
    //make random a number from (0, 999)
    int numRand = makeRandom(minRand, maxRand);

//Separating digits into Array three_digitsNumber[3]
    separatingDigitsIntoArray(numRand, 3, three_digitNumber);
    printf("The slot machine shows ");
    for (int i = 0; i < 3; i++) {
        printf("%d", three_digitNumber[i]);
    }
    printf("\n");
    //Count Combination--> 0, 1, 2
    int countCombination;
    if (three_digitNumber[0] == three_digitNumber[1] && three_digitNumber[0] == three_digitNumber[2]) {
        countCombination = 2;
    } else if (three_digitNumber[0] == three_digitNumber[1] || three_digitNumber[0] == three_digitNumber[2] || three_digitNumber[1] == three_digitNumber[2]) {
        countCombination = 1;
    } else
        countCombination = 0;
    return countCombination;
}

float playTheSlotMachine(float money) {
    //start play game -- > money - $0.25
    money -= 0.25;
    //assign countCombination = a number form 0--> 999 by function radomThree_digitNumber();
    int countCombination = randomThree_digitNumber(0, 999);
    if (countCombination == 2) {
        printf("You win the big prize, $10.00!\n");
        money += 10;
    } else if (countCombination == 1) {
        printf("You win 50 cents!\n");
        money += 0.5;
    } else {
        printf("Sorry you don't win anything.\n");
    }
    printf("You have $%.2f\n", money);
    printf("---------------------------------------\n");
    //return money for next time
    return money;
}

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