package aufgabe2;

import java.util.ArrayList;
import java.util.List;

public class CharCollection {
    private List<Character> chars = new ArrayList<>();

    CharCollection(CharCollection cc){
        List<Character> chars = new ArrayList<>();

        for(int i = 0; i < cc.size(); i++) {
            chars.add(cc.getChars().get(i));
        }

        setChars(chars);
    }

    CharCollection(char... cs) {
        List<Character> chars = new ArrayList<>();

        for(int i = 0; i < cs.length; i++) {
            chars.add(cs[i]);
        }

        setChars(chars);
    }

    CharCollection(String s){
        List<Character> chars = new ArrayList<>();

        for(int i = 0; i < s.length(); i++) {
            chars.add(s.charAt(i));
        }

        setChars(chars);
    }

    public int size() {
        return chars.size();
    }

    public int count(char c) {
        Character c2 = c;
        int count = 0;

        for(int i = 0; i < size(); i++) {
            if(getChars().get(i).equals(c2)) {
                count++;
            }
        }

        return count;
    }

    public int different() {
        List<Character> tmp = new ArrayList<>();

        for(int i = 0; i < size(); i++) {
            if(!tmp.contains(chars.get(i))) {
                tmp.add(chars.get(i));
            }
        }

        return tmp.size();
    }

    public char top() {
        if(size() == 0) {
            return 0;
        }

        int topCharIndex = 0;
        int topCharAmount = 0;

        for(int i = 0; i < size(); i++) {
            if(count(chars.get(i)) > topCharAmount) {
                topCharAmount = count(chars.get(i));
                topCharIndex = i;
            }
        }

        return chars.get(topCharIndex);
    }

    public String toString() {
        String s = "(";

        for(int i = 0; i < size(); i++) {
            s += chars.get(i);
            if(i < size()-1) {
                s += ", ";
            }
        }

        s += ")";
        return s;
    }

    public CharCollection moreThan(int m) {
        CharCollection returnCollection = new CharCollection("");

        for(int i = 0; i < size(); i++) {
            if(count(this.chars.get(i)) > m) {
                returnCollection.getChars().add(this.getChars().get(i));
            }
        }

        return returnCollection;
    }

    public boolean equals(Object x) {
        if(x instanceof CharCollection) {
            for(int i = 0; i < size(); i++) {
                Character tmp = this.getChars().get(i);
                if(((CharCollection) x).count(tmp) != this.count(tmp)) {
                    return false;
                }
            }
            return true;
        } else {
            return false;
        }
    }

    public CharCollection except(CharCollection cc) {
        CharCollection ccReturn = new CharCollection(this);

        for(int i = 0; i < cc.size(); i++) {
            char tmp = cc.getChars().get(i);
            for(int j = 0; j < ccReturn.size(); j++) {
                if(tmp == ccReturn.getChars().get(j)) {
                    ccReturn.getChars().remove(j);
                    break;
                }
            }
        }

        return ccReturn;
    }

    public boolean isSubset(CharCollection cc) {
        for(int i = 0; i < cc.size(); i++) {
            if(cc.count(cc.getChars().get(i)) >  this.count(cc.getChars().get(i))) {
                return false;
            }
        }
        return true;
    }

    public List<Character> getChars() {
        return chars;
    }


    public void setChars(List<Character> chars) {
        this.chars = chars;
    }
}