#include <stdio.h>
#include <stdbool.h>
#define MALE false
#define FEMALE true

typedef struct {
    int year;
    int month;
    int date;
} DATE;

typedef struct {
    int ID;
    char name[21];
    bool sex;
    DATE birthday;
    double score;
} STUDENT;

void saveStu(STUDENT students[], int count) {
    int i;
    FILE* fileObj;
    for (i = 0; i < count; i++) {
        printf("ID: ");
        scanf("%d", &students[i].ID);
        printf("Name(max 20 char): ");
        scanf("%20s", students[i].name);
        printf("Sex: (MALE-0/FEMLE-1)");
        scanf("%d", &students[i].sex);
        printf("Birthday (Year/Month/Date):");
        scanf("%d/%d/%d", &students[i].birthday.year, &students[i].birthday.month, &students[i].birthday.date);
        printf("Scores:\n");
        scanf("%lf", &students[i].score);   
    }
    fileObj = fopen("studentInfos", "wb");
    if (fileObj == NULL) {
        printf("Cannot open file.\n");
        return;
    }
    if (fwrite(students, sizeof(STUDENT), count, fileObj) == 0) {
        printf("Print file error.\n");
    }
    fclose(fileObj);
}

void loadStu(STUDENT students[], int count) {
    int i;
    FILE* fileObj;
    int targetID;
    fileObj = fopen("studentInfos", "rb");
    if (fileObj == NULL) {
        printf("Cannot open file.\n");
        return;
    }
    if (fread(students, sizeof(STUDENT), count, fileObj) == 0) {
        printf("Read error.\n");
        return;
    }
    fclose(fileObj);
    printf("Loaded.\n");
    printf("ID to be checked: ");
    scanf("%d", &targetID);
    for (i = 0; i < count; i++) {
        if (targetID == students[i].ID) {
            printf("ID:%d; Name: %s; Sex:%s; Birthday:%d/%d/%d; Score:%lf\n", students[i].ID, students[i].name, students[i].sex?"FEMALE":"MALE", students[i].birthday.year, students[i].birthday.month, students[i].birthday.date, students[i].score);
            return;
        }
        
    }
}

int main() {
    STUDENT students[10];
    int i = 0;
    int count = 3;
    char mode;
    // freopen("fakedata","r",stdin);
    printf("Select: (S)ave/(L)oad ");
    scanf("%c", &mode);
    if (mode == 's' || mode == 'S') {
        saveStu(students, count);
    }
    else if (mode == 'l' || mode == 'L') {
        loadStu(students, count);
    }
    
    return 0;
}