package org.opengroupware.jope.appserver.elements;

import java.util.Map;

import org.opengroupware.jope.appserver.WOAssociation;
import org.opengroupware.jope.appserver.WOContext;
import org.opengroupware.jope.appserver.WOElement;
import org.opengroupware.jope.appserver.WORequest;
import org.opengroupware.jope.appserver.WOResponse;

public class WOCheckBox extends WOInput {
  
  protected WOAssociation selection;
  protected WOAssociation checked;

  public WOCheckBox(String _name, Map<String, WOAssociation> _assocs,
                    WOElement _template)
  {
    super(_name, _assocs, _template);

    this.selection = grabAssociation(_assocs, "selection");
    this.checked   = grabAssociation(_assocs, "checked");
  }
  
  /* responder */

  public void takeValuesFromRequest(WORequest _rq, WOContext _ctx) {
    /*
     * Checkboxes are special in their form-value handling. If the form is
     * submitted and the checkbox is checked, a 'YES' value is transferred in
     * the request.
     * BUT: If the checkbox is not-checked, no value is transferred at all!
     * 
     * TODO: this one is really tricky because we don't know whether the
     *       takeValues is actually triggered by a request which represents the
     *       form that contains the checkbox!
     *       Best workaround for now is to run takeValues only for POST.
     */
    Object cursor = _ctx.cursor();
    
    if (this.disabled != null) {
      if (this.disabled.booleanValueInComponent(cursor))
        return;
    }
    
    String formName  = this.elementNameInContext(_ctx);
    Object formValue = _rq.formValueForKey(formName);
    
    if (this.checked != null) {
      if (this.checked.isValueSettableInComponent(cursor))
        this.checked.setBooleanValue(formValue != null, cursor);
    }
    
    // TODO: document why we don't reset the value if missing
    if (formValue != null && this.value != null) {
      if (this.value.isValueSettableInComponent(cursor))
        this.value.setValue(formValue, cursor);
    }
  }
  
  public void appendToResponse(WOResponse _r, WOContext _ctx) {
    if (_ctx.isRenderingDisabled())
      return;
    
    _r.appendBeginTag("input");
    _r.appendAttribute("type", "checkbox");
    _r.appendAttribute("name", this.elementNameInContext(_ctx));
    
    Object cursor = _ctx.cursor();
    String v = null;
    if (this.value != null)
      v = this.value.stringValueInComponent(cursor);
    if (v == null || v.length() == 0)
      v = "1";
    _r.appendAttribute("value", v);
    
    if (this.disabled != null) {
      if (this.disabled.booleanValueInComponent(_ctx.cursor()))
        _r.appendAttribute("disabled", "disabled");
    }

    if (this.checked != null) {
      if (this.checked.booleanValueInComponent(_ctx.cursor()))
        _r.appendAttribute("checked", "checked");
    }
    
    this.appendExtraAttributesToResponse(_r, _ctx);
    // TODO: otherTagString
    
    _r.appendBeginTagClose();
  }

  
  /* description */
  
  public void appendAttributesToDescription(StringBuffer _d) {
    super.appendAttributesToDescription(_d);
    
    this.appendAssocToDescription(_d, "selection", this.selection);
    this.appendAssocToDescription(_d, "checked",   this.checked);
  }  
}