using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Biblioteka {
    public class WypelnianieLosowe : DataFiller {
        private int iloscC, iloscW, iloscE, iloscK;
        public WypelnianieLosowe() : this(20, 11, 43, 16) { }
        public WypelnianieLosowe(int iloscC, int iloscW, int iloscE, int iloscK) {
            this.iloscC = iloscC;
            this.iloscW = iloscW;
            this.iloscE = iloscE;
            this.iloscK = iloscK;
        }
        public void Fill(DataContext dataContext) {
            for (int i = 0; i < iloscC; i++) {
                dataContext.Czytelnicy.Add(new Czytelnik(RandomString(5, 7), RandomString(7, 12), Random.Next(100000000)));
            }
            for (int i = 0; i < iloscK; i++) {
                Ksiazka k = new Ksiazka(RandomString(4, 8), RandomString(6, 12), Random.Next(1700, 2100));
                dataContext.Ksiazki.Add(k.Tytul.GetHashCode(), k);
            }
            List<int> KsiazkaKeys = dataContext.Ksiazki.Keys.ToList();
            for (int i = 0; i < iloscE; i++) {
                dataContext.Egzemplarze.Add(new Egzemplarz(DateTime.Now.AddDays(-(Random.Next(80, 1000)))
                    , dataContext.Ksiazki[KsiazkaKeys[Random.Next(KsiazkaKeys.Count)]], RandomString(8, 30)));
            }
            for(int i =0;i<iloscW;i++) {
                dataContext.Wypozyczenia.Add(new Wypozyczenie(dataContext.Czytelnicy[Random.Next(dataContext.Czytelnicy.Count)]
                    , dataContext.Egzemplarze[Random.Next(dataContext.Egzemplarze.Count)], DateTime.Now.AddDays(Random.Next(-70,300))));
            }
        }
        private Random Random = new Random();
        private string RandomString(int minLength, int maxLength) {
            int length = Random.Next(minLength, maxLength + 1);
            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < length; i++) {
                builder.Append(characters[Random.Next(characters.Length)]);
            }
            return builder.ToString();
        }
        private readonly string characters = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
    }
}