/**
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.exoplatform.webui.form;

import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

import org.exoplatform.webui.application.WebuiRequestContext;
import org.exoplatform.webui.core.UIComponent;
import org.exoplatform.webui.core.model.SelectItem;
import org.exoplatform.webui.core.model.SelectOption;
import org.exoplatform.webui.core.model.SelectOptionGroup;
import org.gatein.common.logging.Logger;
import org.gatein.common.logging.LoggerFactory;

/**
 * Represents a select element
 *
 */
public class UIFormSelectBoxWithGroups extends UIFormStringInput {

    /** . */
    private static final Logger log = LoggerFactory.getLogger(UIFormSelectBoxWithGroups.class);

    /**
     * It make SelectBox's ability to select multiple values
     */
    private boolean isMultiple_ = false;

    /**
     * The size of the list (number of select options)
     */
    private int size_ = 1;

    /**
     * The list of options
     */
    private List<SelectItem> options_;

    /**
     * The javascript expression executed when an onChange event fires
     */
    private String onchange_;

    public UIFormSelectBoxWithGroups(String name, String bindingExpression, List<SelectItem> options) {
        super(name, bindingExpression, null);
        setOptions(options);
    }

    public final UIFormSelectBoxWithGroups setMultiple(boolean bl) {
        isMultiple_ = bl;
        return this;
    }

    public final UIFormSelectBoxWithGroups setSize(int i) {
        size_ = i;
        return this;
    }

    public UIFormSelectBoxWithGroups setValue(String value) {
        value_ = value;
        for (SelectItem option : options_) {
            if (option instanceof SelectOption) {
                if (((SelectOption) option).getValue().equals(value_))
                    ((SelectOption) option).setSelected(true);
                else
                    ((SelectOption) option).setSelected(false);
            } else if (option instanceof SelectOptionGroup) {
                ((SelectOptionGroup) option).setValue(value);
            }
        }

        return this;
    }

    public String[] getSelectedValues() {
        if (isMultiple_) {
            List<String> selectedValues = new ArrayList<String>();
            for (SelectItem option : options_) {
                if (option instanceof SelectOption) {
                    if (((SelectOption) option).isSelected())
                        selectedValues.add(((SelectOption) option).getValue());
                } else if (option instanceof SelectOptionGroup) {
                    selectedValues.addAll(((SelectOptionGroup) option).getSelectedValues());
                }

            }
            return selectedValues.toArray(new String[0]);
        }
        return new String[] { value_ };
    }

    public UIFormSelectBoxWithGroups setSelectedValues(String[] values) {
        for (SelectItem option : options_) {
            if (option instanceof SelectOption) {
                ((SelectOption) option).setSelected(false);
                for (String value : values) {
                    if (value.equals(((SelectOption) option).getValue())) {
                        ((SelectOption) option).setSelected(true);
                        break;
                    }
                }
            } else if (option instanceof SelectOptionGroup) {
                ((SelectOptionGroup) option).setSelectedValue(values);
            }
        }

        return this;
    }

    public final List<SelectItem> getOptions() {
        return options_;
    }

    public final UIFormSelectBoxWithGroups setOptions(List<SelectItem> options) {
        options_ = options;
        if (options_ == null || options_.size() < 1)
            return this;
        for (SelectItem option : options_) {
            if (option instanceof SelectOption) {
                value_ = ((SelectOption) option).getValue();
                break;
            }
        }
        return this;
    }

    public UIFormSelectBoxWithGroups addOptionGroup(String label, List<SelectOption> options) {
        SelectOptionGroup group = new SelectOptionGroup(label);
        group.setOptions(options);
        options_.add(group);
        return this;
    }

    @Override
    public void reset() {
        // TODO Auto-generated method stub - dang.tung
        if (options_ == null || options_.size() < 1)
            return;
        for (SelectItem option : options_) {
            if (option instanceof SelectOption)
                ((SelectOption) option).setSelected(false);
            else if (option instanceof SelectOptionGroup) {
                ((SelectOptionGroup) option).reset();
            }
        }
        for (SelectItem option : options_) {
            if (option instanceof SelectOption) {
                value_ = ((SelectOption) option).getValue();
                ((SelectOption) option).setSelected(true);
                break;
            }
        }
    }

    public void setOnChange(String onchange) {
        onchange_ = onchange;
    }

    @SuppressWarnings("deprecation")
    public UIFormSelectBoxWithGroups setDisabled(boolean disabled) {
        return (UIFormSelectBoxWithGroups) super.setDisabled(disabled);
    }

    @SuppressWarnings("unused")
    public void decode(Object input, WebuiRequestContext context) {
        String[] values = context.getRequestParameterValues(getId());
        if (values == null) {
            value_ = null;
            for (SelectItem option : options_) {
                if (option instanceof SelectOption)
                    ((SelectOption) option).setSelected(false);
                else if (option instanceof SelectOptionGroup) {
                    for (SelectOption opt : ((SelectOptionGroup) option).getOptions()) {
                        opt.setSelected(false);
                    }
                }
            }
            return;
        }

        int i = 0;
        value_ = values[0];
        for (SelectItem item : options_) {
            if (item instanceof SelectOption) {
                if (i > -1 && ((SelectOption) item).getValue().equals(values[i])) {
                    ((SelectOption) item).setSelected(true);
                    if (values.length == ++i)
                        i = -1;
                } else
                    ((SelectOption) item).setSelected(false);
            } else if (item instanceof SelectOptionGroup) {
                for (SelectOption opt : ((SelectOptionGroup) item).getOptions()) {
                    if (i > -1 && ((SelectOption) opt).getValue().equals(values[i])) {
                        ((SelectOption) opt).setSelected(true);
                        if (values.length == ++i)
                            i = -1;
                    } else {
                        ((SelectOption) opt).setSelected(false);
                    }
                }
            }
        }
    }

    // protected String renderOnChangeAction(UIForm uiform) throws Exception {
    // StringBuilder builder = new StringBuilder();
    // builder.append(" onchange=\"javascript:eXo.webui.UIForm.submitForm('").
    // append("").append("','").append(onchange_).append("');\" ");
    // return builder.toString();
    // }

    protected String renderOnChangeEvent(UIForm uiForm) throws Exception {
        return uiForm.event(onchange_, (String) null);
    }

    protected UIForm getFrom() {
        return getAncestorOfType(UIForm.class);
    }

    public void processRender(WebuiRequestContext context) throws Exception {
        ResourceBundle res = context.getApplicationResourceBundle();
        UIForm uiForm = getAncestorOfType(UIForm.class);
        String formId = null;
        if (uiForm.getId().equals("UISearchForm"))
            formId = uiForm.<UIComponent> getParent().getId();
        else
            formId = uiForm.getId();

        Writer w = context.getWriter();
        w.write("<select class=\"selectbox\" name=\"");
        w.write(name);
        w.write("\"");
        if (onchange_ != null) {
            w.append(" onchange=\"").append(renderOnChangeEvent(uiForm)).append("\"");
        }

        if (isMultiple_)
            w.write(" multiple=\"true\"");
        if (size_ > 1)
            w.write(" size=\"" + size_ + "\"");

        if (isDisabled())
            w.write(" disabled ");

        renderHTMLAttributes(w);

        w.write(">\n");

        for (SelectItem item : options_) {
            String label = item.getLabel();
            if (item instanceof SelectOption) {
                try {
                    label = res.getString(formId + ".label.option." + ((SelectOption) item).getValue());
                } catch (MissingResourceException ex) {
                }

                w.write(renderOption(((SelectOption) item), label));

            } else if (item instanceof SelectOptionGroup) {
                label = item.getLabel();
                try {
                    label = res.getString(getFrom().getId() + ".optionGroup.label." + label);
                } catch (MissingResourceException ex) {
                    log.debug("Could not find: " + getFrom().getId() + ".optionGroup.label." + label);
                }
                w.write("<optgroup label=\"");
                w.write(label);
                w.write("\">\n");
                for (SelectOption opt : ((SelectOptionGroup) item).getOptions()) {
                    label = opt.getLabel();
                    try {
                        label = res.getString(formId + ".label.option." + opt.getValue());
                    } catch (MissingResourceException ex) {
                    }
                    w.write(renderOption(opt, label));

                }
                w.write("</optgroup>\n");
            }
        }
        w.write("</select>\n");
        if (this.isMandatory())
            w.write(" *");
    }

    private String renderOption(SelectOption option, String label) {
        StringBuffer buf = new StringBuffer();
        buf.append("<option value=\"");
        buf.append(option.getValue());
        buf.append("\"");
        if (option.isSelected())
            buf.append("selected=\"selected\"");
        buf.append(">");
        buf.append(label);
        buf.append("</option>\n");
        return buf.toString();
    }

}
