/**
 * Copyright (c) 2005-2012 by Appcelerator, Inc. All Rights Reserved.
 * Licensed under the terms of the Eclipse Public License (EPL).
 * Please see the license.txt included with this distribution for details.
 * Any modifications to this file must keep this entire header intact.
 */
/*
 * Created on Oct 28, 2004
 *
 * @author Fabio Zadrozny
 */
package org.python.pydev.utils;

import org.eclipse.jface.preference.FieldEditor;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.core.runtime.Assert;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.FocusAdapter;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.KeyAdapter;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Text;

/**
 * @author Fabio Zadrozny
 */
public class CustomizableFieldEditor extends FieldEditor {

    /**
     * Validation strategy constant (value <code>0</code>) indicating that the editor should perform validation after every key stroke.
     * 
     * @see #setValidateStrategy
     */
    public static final int VALIDATE_ON_KEY_STROKE = 0;

    /**
     * Validation strategy constant (value <code>1</code>) indicating that the editor should perform validation only when the text widget
     * loses focus.
     * 
     * @see #setValidateStrategy
     */
    public static final int VALIDATE_ON_FOCUS_LOST = 1;

    /**
     * Text limit constant (value <code>-1</code>) indicating unlimited text limit and width.
     */
    public static int UNLIMITED = -1;

    /**
     * Cached valid state.
     */
    private boolean isValid;

    /**
     * Old text value.
     */
    private String oldValue;

    /**
     * The text field, or <code>null</code> if none.
     */
    Text textField;

    /**
     * Width of text field in characters; initially unlimited.
     */
    private int widthInChars = UNLIMITED;

    /**
     * Text limit of text field in characters; initially unlimited.
     */
    private int textLimit = UNLIMITED;

    /**
     * The error message, or <code>null</code> if none.
     */
    private String errorMessage;

    /**
     * Indicates whether the empty string is legal; <code>true</code> by default.
     */
    private boolean emptyStringAllowed = true;

    /**
     * The validation strategy; <code>VALIDATE_ON_KEY_STROKE</code> by default.
     */
    private int validateStrategy = VALIDATE_ON_KEY_STROKE;

    /**
     * Creates a new string field editor
     */
    protected CustomizableFieldEditor() {
    }

    /**
     * Creates a string field editor. Use the method <code>setTextLimit</code> to limit the text.
     * 
     * @param name the name of the preference this field editor works on
     * @param labelText the label text of the field editor
     * @param width the width of the text input field in characters, or <code>UNLIMITED</code> for no limit
     * @param strategy either <code>VALIDATE_ON_KEY_STROKE</code> to perform on the fly checking (the default), or
     *            <code>VALIDATE_ON_FOCUS_LOST</code> to perform validation only after the text has been typed in
     * @param parent the parent of the field editor's control
     * @since 2.0
     */
    public CustomizableFieldEditor(String name, String labelText, int width, int strategy, Composite parent) {
        init(name, labelText);
        widthInChars = width;
        setValidateStrategy(strategy);
        isValid = false;
        errorMessage = JFaceResources.getString("StringFieldEditor.errorMessage");//$NON-NLS-1$
        createControl(parent);
    }

    /**
     * Creates a string field editor. Use the method <code>setTextLimit</code> to limit the text.
     * 
     * @param name the name of the preference this field editor works on
     * @param labelText the label text of the field editor
     * @param width the width of the text input field in characters, or <code>UNLIMITED</code> for no limit
     * @param parent the parent of the field editor's control
     */
    public CustomizableFieldEditor(String name, String labelText, int width, Composite parent) {
        this(name, labelText, width, VALIDATE_ON_KEY_STROKE, parent);
    }

    /**
     * Creates a string field editor of unlimited width. Use the method <code>setTextLimit</code> to limit the text.
     * 
     * @param name the name of the preference this field editor works on
     * @param labelText the label text of the field editor
     * @param parent the parent of the field editor's control
     */
    public CustomizableFieldEditor(String name, String labelText, Composite parent) {
        this(name, labelText, UNLIMITED, parent);
    }

    /*
     * (non-Javadoc) Method declared on FieldEditor.
     */
    protected void adjustForNumColumns(int numColumns) {
        //        GridData gd = (GridData) textField.getLayoutData();
        //        gd.horizontalSpan = 30;//numColumns - 1;

        GridData gd = (GridData) textField.getLayoutData();
        gd.horizontalSpan = numColumns - 1;
        // We only grab excess space if we have to
        // If another field editor has more columns then
        // we assume it is setting the width.
        gd.grabExcessHorizontalSpace = gd.horizontalSpan == 1;
    }

    /**
     * Checks whether the text input field contains a valid value or not.
     * 
     * @return <code>true</code> if the field value is valid, and <code>false</code> if invalid
     */
    protected boolean checkState() {
        boolean result = false;
        if (emptyStringAllowed)
            result = true;

        if (textField == null)
            result = false;

        String txt = textField.getText();

        if (txt == null) {
            result = false;
        } else {
            result = (txt.trim().length() > 0) || emptyStringAllowed;
        }

        // call hook for subclasses
        result = result && doCheckState();

        if (result)
            clearErrorMessage();
        else
            showErrorMessage(errorMessage);

        return result;
    }

    /**
     * Hook for subclasses to do specific state checks.
     * <p>
     * The default implementation of this framework method does nothing and returns <code>true</code>. Subclasses should override this
     * method to specific state checks.
     * </p>
     * 
     * @return <code>true</code> if the field value is valid, and <code>false</code> if invalid
     */
    protected boolean doCheckState() {
        return true;
    }

    /**
     * Fills this field editor's basic controls into the given parent.
     * <p>
     * The string field implementation of this <code>FieldEditor</code> framework method contributes the text field. Subclasses may
     * override but must call <code>super.doFillIntoGrid</code>.
     * </p>
     */
    protected void doFillIntoGrid(Composite parent, int numColumns) {
        getLabelControl(parent);

        textField = getTextControl(parent);
        GridData gd = new GridData();
        gd.horizontalSpan = numColumns - 1;
        if (widthInChars != UNLIMITED) {
            GC gc = new GC(textField);
            try {
                Point extent = gc.textExtent("X");//$NON-NLS-1$
                gd.widthHint = widthInChars * extent.x;
            } finally {
                gc.dispose();
            }
        } else {
            //            System.out.println("fill");
            gd.horizontalAlignment = GridData.FILL_BOTH;
            gd.verticalSpan = 4;
            gd.horizontalSpan = 1;
            gd.grabExcessVerticalSpace = true;
            gd.widthHint = 400;
            gd.heightHint = 60;
            //            gd.grabExcessHorizontalSpace = true;
        }
        textField.setLayoutData(gd);
    }

    /*
     * (non-Javadoc) Method declared on FieldEditor.
     */
    protected void doLoad() {
        if (textField != null) {
            String value = getPreferenceStore().getString(getPreferenceName());
            textField.setText(value);
            oldValue = value;
        }
    }

    /*
     * (non-Javadoc) Method declared on FieldEditor.
     */
    protected void doLoadDefault() {
        if (textField != null) {
            String value = getPreferenceStore().getDefaultString(getPreferenceName());
            textField.setText(value);
        }
        valueChanged();
    }

    /*
     * (non-Javadoc) Method declared on FieldEditor.
     */
    protected void doStore() {
        getPreferenceStore().setValue(getPreferenceName(), textField.getText());
    }

    /**
     * Returns the error message that will be displayed when and if an error occurs.
     * 
     * @return the error message, or <code>null</code> if none
     */
    public String getErrorMessage() {
        return errorMessage;
    }

    /*
     * (non-Javadoc) Method declared on FieldEditor.
     */
    public int getNumberOfControls() {
        return 2;
    }

    /**
     * Returns the field editor's value.
     * 
     * @return the current value
     */
    public String getStringValue() {
        if (textField != null)
            return textField.getText();
        else
            return getPreferenceStore().getString(getPreferenceName());
    }

    /**
     * Returns this field editor's text control.
     * 
     * @return the text control, or <code>null</code> if no text field is created yet
     */
    protected Text getTextControl() {
        return textField;
    }

    /**
     * Returns this field editor's text control.
     * <p>
     * The control is created if it does not yet exist
     * </p>
     * 
     * @param parent the parent
     * @return the text control
     */
    public Text getTextControl(Composite parent) {
        if (textField == null) {
            //            System.out.println("creating...");
            textField = new Text(parent, SWT.MULTI | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
            textField.setFont(parent.getFont());
            switch (validateStrategy) {
                case VALIDATE_ON_KEY_STROKE:
                    textField.addKeyListener(new KeyAdapter() {

                        /*
                         * (non-Javadoc)
                         * 
                         * @see org.eclipse.swt.events.KeyAdapter#keyReleased(org.eclipse.swt.events.KeyEvent)
                         */
                        public void keyReleased(KeyEvent e) {
                            valueChanged();
                        }
                    });

                    break;
                case VALIDATE_ON_FOCUS_LOST:
                    textField.addKeyListener(new KeyAdapter() {
                        public void keyPressed(KeyEvent e) {
                            clearErrorMessage();
                        }
                    });
                    textField.addFocusListener(new FocusAdapter() {
                        public void focusGained(FocusEvent e) {
                            refreshValidState();
                        }

                        public void focusLost(FocusEvent e) {
                            valueChanged();
                            clearErrorMessage();
                        }
                    });
                    break;
                default:
                    Assert.isTrue(false, "Unknown validate strategy");//$NON-NLS-1$
            }
            textField.addDisposeListener(new DisposeListener() {
                public void widgetDisposed(DisposeEvent event) {
                    textField = null;
                }
            });
            if (textLimit > 0) {//Only set limits above 0 - see SWT spec
                textField.setTextLimit(textLimit);
            }
        } else {
            checkParent(textField, parent);
        }
        return textField;
    }

    /**
     * Returns whether an empty string is a valid value.
     * 
     * @return <code>true</code> if an empty string is a valid value, and <code>false</code> if an empty string is invalid
     * @see #setEmptyStringAllowed
     */
    public boolean isEmptyStringAllowed() {
        return emptyStringAllowed;
    }

    /*
     * (non-Javadoc) Method declared on FieldEditor.
     */
    public boolean isValid() {
        return isValid;
    }

    /*
     * (non-Javadoc) Method declared on FieldEditor.
     */
    protected void refreshValidState() {
        isValid = checkState();
    }

    /**
     * Sets whether the empty string is a valid value or not.
     * 
     * @param b <code>true</code> if the empty string is allowed, and <code>false</code> if it is considered invalid
     */
    public void setEmptyStringAllowed(boolean b) {
        emptyStringAllowed = b;
    }

    /**
     * Sets the error message that will be displayed when and if an error occurs.
     * 
     * @param message the error message
     */
    public void setErrorMessage(String message) {
        errorMessage = message;
    }

    /*
     * (non-Javadoc) Method declared on FieldEditor.
     */
    public void setFocus() {
        if (textField != null) {
            textField.setFocus();
        }
    }

    /**
     * Sets this field editor's value.
     * 
     * @param value the new value, or <code>null</code> meaning the empty string
     */
    public void setStringValue(String value) {
        if (textField != null) {
            if (value == null)
                value = "";//$NON-NLS-1$
            oldValue = textField.getText();
            if (!oldValue.equals(value)) {
                textField.setText(value);
                valueChanged();
            }
        }
    }

    /**
     * Sets this text field's text limit.
     * 
     * @param limit the limit on the number of character in the text input field, or <code>UNLIMITED</code> for no limit
     *  
     */
    public void setTextLimit(int limit) {
        textLimit = limit;
        if (textField != null)
            textField.setTextLimit(limit);
    }

    /**
     * Sets the strategy for validating the text.
     * <p>
     * Calling this method has no effect after <code>createPartControl</code> is called. Thus this method is really only useful for
     * subclasses to call in their constructor. However, it has public visibility for backward compatibility.
     * </p>
     * 
     * @param value either <code>VALIDATE_ON_KEY_STROKE</code> to perform on the fly checking (the default), or
     *            <code>VALIDATE_ON_FOCUS_LOST</code> to perform validation only after the text has been typed in
     */
    public void setValidateStrategy(int value) {
        Assert.isTrue(value == VALIDATE_ON_FOCUS_LOST || value == VALIDATE_ON_KEY_STROKE);
        validateStrategy = value;
    }

    /**
     * Shows the error message set via <code>setErrorMessage</code>.
     */
    public void showErrorMessage() {
        showErrorMessage(errorMessage);
    }

    /**
     * Informs this field editor's listener, if it has one, about a change to the value (<code>VALUE</code> property) provided that the
     * old and new values are different.
     * <p>
     * This hook is <em>not</em> called when the text is initialized (or reset to the default value) from the preference store.
     * </p>
     */
    protected void valueChanged() {
        setPresentsDefaultValue(false);
        boolean oldState = isValid;
        refreshValidState();

        if (isValid != oldState)
            fireStateChanged(IS_VALID, oldState, isValid);

        String newValue = textField.getText();
        if (!newValue.equals(oldValue)) {
            fireValueChanged(VALUE, oldValue, newValue);
            oldValue = newValue;
        }
    }

    /*
     * @see FieldEditor.setEnabled(boolean,Composite).
     */
    public void setEnabled(boolean enabled, Composite parent) {
        super.setEnabled(enabled, parent);
        getTextControl(parent).setEnabled(enabled);
    }
}
