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/**
 * Copyright 2018 Mike Hummel
 *
 * 
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of the License at
 *
 * 
http://www.apache.org/licenses/LICENSE-2.0
 *
 * 
Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
package de.mhus.lib.adb.model;

import java.util.HashMap;
import java.util.LinkedList;

import de.mhus.lib.adb.DbDynamic;
import de.mhus.lib.adb.DbManager;
import de.mhus.lib.core.MCast;
import de.mhus.lib.core.MSystem;
import de.mhus.lib.core.config.IConfig;
import de.mhus.lib.core.pojo.PojoAttribute;
import de.mhus.lib.core.util.MObject;
import de.mhus.lib.errors.MException;
import de.mhus.lib.sql.DbResult;

public abstract class Field extends MObject {

    protected boolean isPrimary;
    protected String name;
    protected String nameOrg;
    protected String createName;
    protected Table table;
    protected DbManager manager;
    protected boolean nullable = true;
    protected String defValue = null;
    protected String description;
    protected String[] hints;
    protected int size = 200;
    protected String retDbType;
    protected String methodName;
    protected boolean autoId;
    protected IConfig attr;
    protected DbDynamic.Field dynamicField;
    protected PojoAttribute attribute;
    private LinkedList features = new LinkedList<>();
    protected boolean readOnly = false;

    public abstract void prepareCreate(Object obj) throws Exception;

    public abstract boolean isPersistent();

    public abstract Object getFromTarget(Object obj) throws Exception;

    public abstract void setToTarget(DbResult res, Object obj) throws Exception;

    public abstract boolean changed(DbResult res, Object obj) throws Exception;

    public abstract void fillNameMapping(HashMap nameMapping);

    protected void init(String[] features) throws MException {
        if (features != null) {
            for (String featureName : features) {
                AttributeFeature f =
                        manager.getSchema().createAttributeFeature(manager, this, featureName);
                if (f != null) this.features.add(f);
            }
        }
    }

    public void set(Object obj, Object value) throws Exception {

        if (attribute.getType().isEnum()) {
            int index = -1;
            if (value == null) index = MCast.toint(defValue, -1);
            else if (value instanceof Number) index = ((Number) value).intValue();

            Object[] values = attribute.getType().getEnumConstants();
            if (value instanceof String) {
                for (int i = 0; i < values.length; i++)
                    if (values[i].toString().equals(value)) index = i;
                if (index < 0) index = MCast.toint(value, -1);
            }

            if (index < 0 || index >= values.length)
                throw new MException("index not found in enum", attribute.getType().getName());

            value = values[index];
        }

        for (Feature f : table.getFeatures()) value = f.setValue(obj, this, value);

        for (AttributeFeature f : features) value = f.set(obj, value);

        if (dynamicField != null && obj instanceof DbDynamic)
            ((DbDynamic) obj).setValue(dynamicField, value);
        else attribute.set(obj, value, false);
    }

    public boolean different(Object obj, Object value) throws Exception {

        if (attribute.getType().isEnum()) {
            int index = -1;
            if (value == null) index = MCast.toint(defValue, -1);
            else if (value instanceof Number) index = ((Number) value).intValue();

            Object[] values = attribute.getType().getEnumConstants();
            if (index < 0 || index >= values.length)
                throw new MException("index not found in enum", attribute.getType().getName());

            value = values[index];

            Object objValue = null;

            if (dynamicField != null && obj instanceof DbDynamic)
                objValue = ((DbDynamic) obj).getValue(dynamicField);
            else objValue = attribute.get(obj);

            return !MSystem.equals(String.valueOf(value), String.valueOf(objValue));
        }

        for (Feature f : table.getFeatures()) value = f.setValue(obj, this, value);

        for (AttributeFeature f : features) value = f.set(obj, value);

        Object objValue = null;

        if (dynamicField != null && obj instanceof DbDynamic)
            objValue = ((DbDynamic) obj).getValue(dynamicField);
        else objValue = attribute.get(obj);

        //		for (AttributeFeature f : features)
        //			objValue = f.get(obj, objValue);
        //
        //		for (Feature f : table.getFeatures())
        //			objValue = f.get(obj, this, objValue);

        return !MSystem.equals(value, objValue);
    }

    public Object get(Object obj) throws Exception {
        Object val = null;
        if (dynamicField != null && obj instanceof DbDynamic)
            val = ((DbDynamic) obj).getValue(dynamicField);
        else val = attribute.get(obj);

        for (AttributeFeature f : features) val = f.get(obj, val);

        for (Feature f : table.getFeatures()) val = f.getValue(obj, this, val);

        return val;
    }

    public IConfig getAttributes() {
        return attr;
    }

    public int getSize() {
        return size;
    }

    public Class getType() {
        return attribute.getType();
    }

    public String getName() {
        return methodName;
    }

    public String getMappedName() {
        return name;
    }

    public String getDescription() {
        return description;
    }

    public String[] getHints() {
        return hints;
    }

    public boolean isReadOnly() {
        return readOnly;
    }

    public boolean isTechnical() {
        return isHint("technical");
    }

    public boolean isHint(String string) {
        if (hints == null) return false;
        for (String h : hints) if (h.equals(string)) return true;
        return false;
    }

    @Override
    public String toString() {
        return MSystem.toString(this, name);
    }
}
    

    

    

            

    

            



    
    






    
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