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package org.anjocaido.groupmanager.data;

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

import org.anjocaido.groupmanager.GroupManager;
import org.anjocaido.groupmanager.dataholder.WorldDataHolder;
import org.anjocaido.groupmanager.utils.StringPermissionComparator;

/**
 * 
 * @author gabrielcouto
 */
public abstract class DataUnit {

    private WorldDataHolder dataSource;
    private String uUID;
    private String lastName;
    private boolean changed, sorted = false;
    private List<String> permissions = Collections.unmodifiableList(Collections.<String> emptyList());

    public DataUnit(WorldDataHolder dataSource, String name) {

        this.dataSource = dataSource;
        this.uUID = name;
    }

    public DataUnit(String name) {

        this.uUID = name;
    }

    /**
     * Every group is matched only by their names and DataSources names.
     * 
     * @param o
     * @return true if they are equal. false if not.
     */
    @Override
    public boolean equals(Object o) {

        if (o instanceof DataUnit) {
            DataUnit go = (DataUnit) o;
            if (this.getUUID().equalsIgnoreCase(go.getUUID())) {
                // Global Group match.
                if (this.dataSource == null && go.getDataSource() == null)
                    return true;
                // This is a global group, the object to test isn't.
                if (this.dataSource == null && go.getDataSource() != null)
                    return false;
                // This is not a global group, but the object to test is.
                if (this.dataSource != null && go.getDataSource() == null)
                    return false;
                // Match on group name and world name.
                if (this.dataSource.getName().equalsIgnoreCase(go.getDataSource().getName()))
                    return true;
            }
        }
        return false;
    }

    @Override
    public int hashCode() {

        int hash = 5;
        hash = 71 * hash + (this.uUID != null ? this.uUID.toLowerCase().hashCode() : 0);
        return hash;
    }

    /**
     * Set the data source to point to a different worldDataHolder
     * 
     * @param source
     */
    public void setDataSource(WorldDataHolder source) {

        this.dataSource = source;
    }

    /**
     * Get the current worldDataHolder this object is pointing to
     * 
     * @return the dataSource
     */
    public WorldDataHolder getDataSource() {

        return dataSource;
    }

    public String getUUID() {

        return uUID;
    }

    public String getLastName() {

        if (uUID.length() < 36)
            return this.uUID;

        return this.lastName;
    }

    public void setLastName(String lastName) {

        if (!lastName.equals(this.lastName)) {

            this.lastName = lastName;
            changed = true;

        }

    }

    public void flagAsChanged() {

        WorldDataHolder testSource = getDataSource();
        String source = "";

        if (testSource == null)
            source = "GlobalGroups";
        else
            source = testSource.getName();

        GroupManager.logger.finest("DataSource: " + source + " - DataUnit: " + getUUID() + " flagged as changed!");
        // for(StackTraceElement st: Thread.currentThread().getStackTrace()){
        // GroupManager.logger.finest(st.toString());
        // }
        sorted = false;
        changed = true;
    }

    public boolean isChanged() {

        return changed;
    }

    public void flagAsSaved() {

        WorldDataHolder testSource = getDataSource();
        String source = "";

        if (testSource == null)
            source = "GlobalGroups";
        else
            source = testSource.getName();

        GroupManager.logger.finest("DataSource: " + source + " - DataUnit: " + getUUID() + " flagged as saved!");
        changed = false;
    }

    public boolean hasSamePermissionNode(String permission) {

        return permissions.contains(permission);
    }

    public void addPermission(String permission) {

        if (!hasSamePermissionNode(permission)) {
            List<String> clone = new ArrayList<String>(permissions);
            clone.add(permission);
            permissions = Collections.unmodifiableList(clone);
        }
        flagAsChanged();
    }

    public boolean removePermission(String permission) {

        flagAsChanged();
        List<String> clone = new ArrayList<String>(permissions);
        boolean ret = clone.remove(permission);
        permissions = Collections.unmodifiableList(clone);
        return ret;
    }

    /**
     * Use this only to list permissions.
     * You can't edit the permissions using the returned ArrayList instance
     * 
     * @return a copy of the permission list
     */
    public List<String> getPermissionList() {
        sortPermissions();
        return permissions;
    }

    public boolean isSorted() {

        return this.sorted;
    }

    public void sortPermissions() {

        if (!isSorted()) {
            List<String> clone = new ArrayList<String>(permissions);
            Collections.sort(clone, StringPermissionComparator.getInstance());
            permissions = Collections.unmodifiableList(clone);
            sorted = true;
        }
    }
}