package org.floens.chan.manager;

import java.util.List;

import org.floens.chan.adapter.PinnedAdapter;
import org.floens.chan.database.DatabaseManager;
import org.floens.chan.model.Loadable;
import org.floens.chan.model.Pin;

import android.content.Context;

public class PinnedManager {
    private static PinnedManager instance;
    
    private final Context context;
    private final List<Pin> pins;
    
    public PinnedManager(Context context) {
        instance = this;
        
        this.context = context;
        pins = DatabaseManager.getInstance().getPinned();
    }
    
    public static PinnedManager getInstance() {
        return instance;
    }
    
    public PinnedAdapter getAdapter() {
        PinnedAdapter adapter = new PinnedAdapter(context, 0);
        
        Pin header = new Pin();
        header.type = Pin.Type.HEADER;
        adapter.add(header);
        
        adapter.addAll(pins);
        
        return adapter;
    }
    
    /**
     * Look for a pin that has an loadable that is equal to the supplied loadable.
     * @param other
     * @return The pin whose loadable is equal to the supplied loadable, or null if no pin was found.
     */
    public Pin findPinByLoadable(Loadable other) {
        for (Pin pin : pins) {
            if (pin.loadable.equals(other)) {
                return pin;
            }
        }
        
        return null;
    }
    
    public boolean add(Pin pin) {
        // No duplicates
        for (Pin e : pins) {
            if (e.loadable.equals(pin.loadable)) {
                return false;
            }
        }
        
        pins.add(pin);
        DatabaseManager.getInstance().addPin(pin);
        return true;
    }

    public void remove(Pin pin) {
        pins.remove(pin);
        DatabaseManager.getInstance().removePin(pin);
    }

    public void update(Pin pin) {
        DatabaseManager.getInstance().updatePin(pin);
    }
}