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

struct pt {
    int code;
    char date[11];
    char code_buyer[20];
    char artikul[20];
    int cnt;
};

void input(pt*&,FILE*,int&);
void display(pt*,int,int);

int main() {
    FILE *h; int count=0,z1=0;
    int z;
    h=fopen("bd.txt","r");
    pt *zakazi;
    if(h) while(!feof(h)) input(zakazi,h,count);
    else {
        printf("BD not Found...\n Created new BD...\n");
        h=fopen("bd.txt","w");
    }
    fclose(h);
    printf("ZAKAZI.\nVi mozhete prosmotret zakazi ili dobavit svoi");
    while(true) {
        printf("\n1: Prosmotret zakazi\n2: Dobavit zakaz\n0: Exit\n\n\tVashi deystviya: ");
        scanf("%d",&z);
        switch(z) {
        case 0: return 0;
        case 2: input(zakazi,NULL,count); break;
        case 1: {
            if(!count) {
                printf("Zakazov net");
                break;
            }
            printf("Viberite Kod Zakaza dlya prosmotra. \n(0: Vivesti vsu tablicy\n-1: ne vivodit ni4ego)\nZakaz N: ");
            scanf("%d",&z1);
            display(zakazi,count,z1);
        } break;
        default: break;
        }
    }
}

void input(pt*& zakazi, FILE *h, int &count) {
    bool found=false;
    if(count) zakazi=(pt*)realloc(zakazi,(count+1)*sizeof(pt));
    else zakazi=(pt*)calloc(1,sizeof(pt));
    if(h) {
        fscanf(h,"%d %s %s %s %d\n",&zakazi[count].code,&zakazi[count].date,&zakazi[count].code_buyer,&zakazi[count].artikul,&zakazi[count].cnt);
    } else {
        printf("\nDobavlenie novogo elementa:\n");
        printf("Vvedite kod zakaza: ");
        scanf("%d",&zakazi[count].code);

        for(int i=0;i<count;i++)
            if(zakazi[count].code==zakazi[i].code) {found=true; break;}
        if((found)||(zakazi[count].code<1)) {
            if(found) printf("Takoi zakaz yzhe est!!!\n"); else printf("Nelzya vvodit takoi kod!!!\n");
            zakazi=(pt*)realloc(zakazi,count*sizeof(pt));
            return;
        }
        printf("Vvedite daty zakaza(dd.mm.yyyy)):");
        scanf("%s",&zakazi[count].date);
        printf("Vvedite kod pokypatelya: ");
        scanf("%s",&zakazi[count].code_buyer);
        printf("Vvedite artikul: ");
        scanf("%s",&zakazi[count].artikul);
        printf("Vvedite koli4estvo: ");
        scanf("%d",&zakazi[count].cnt);
        h=fopen("bd.txt","a");
        fprintf(h,"%d %s %s %s %d\n",zakazi[count].code,zakazi[count].date,zakazi[count].code_buyer,zakazi[count].artikul,zakazi[count].cnt);
        fclose(h);
        printf("Zakaz dobavlen!\n");
    }
    count++;
}

void display(pt* zakazi,int count,int num) {
    bool found;
    if(num==-1) return;
    if(num==0)
        for(int i=0;i<count;i++)
            printf("=== Zakaz: %5d ===\nData: %30s\nKod Pokupatelya: %19s\nArtikul: %27s\nKoli4estvo: %24d\n====================\n",zakazi[i].code,zakazi[i].date,zakazi[i].code_buyer,zakazi[i].artikul,zakazi[i].cnt);
    else {
        found=false;
        for(int i=0;i<count;i++)
            if(zakazi[i].code==num) {
                printf("=== Zakaz: %5d ===\nData: %30s\nKod Pokupatelya: %19s\nArtikul: %27s\nKoli4estvo: %24d\n====================\n",zakazi[i].code,zakazi[i].date,zakazi[i].code_buyer,zakazi[i].artikul,zakazi[i].cnt);
                found=true;
                break;
            }
        if(!found) printf("Zakaz %3d ne naiden!\n",num);
    }
}