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// Copyright 2004, 2005 The Apache Software Foundation
//
// 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 org.apache.tapestry.contrib.inspector;

import java.util.Iterator;
import java.util.Map;

import org.apache.tapestry.BaseComponent;
import org.apache.tapestry.IComponent;
import org.apache.tapestry.IDirect;
import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IRender;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.engine.DirectServiceParameter;
import org.apache.tapestry.engine.IEngineService;
import org.apache.tapestry.engine.ILink;
import org.apache.tapestry.parse.CloseToken;
import org.apache.tapestry.parse.ComponentTemplate;
import org.apache.tapestry.parse.LocalizationToken;
import org.apache.tapestry.parse.OpenToken;
import org.apache.tapestry.parse.TemplateToken;
import org.apache.tapestry.parse.TextToken;
import org.apache.tapestry.parse.TokenType;
import org.apache.tapestry.services.TemplateSource;

/**
 * Component of the {@link Inspector}page used to display the ids and types of all embedded
 * components.
 * 
 * @author Howard Lewis Ship
 */

public abstract class ShowTemplate extends BaseComponent implements IDirect
{
    /** @since 4.0 */
    public abstract TemplateSource getTemplateSource();

    /** @since 4.1 */
    public abstract IEngineService getDirectService();
    
    public boolean getHasTemplate()
    {
        Inspector inspector;

        inspector = (Inspector) getPage();

        // Components that inherit from BaseComponent have templates,
        // others do not.

        return inspector.getInspectedComponent() instanceof BaseComponent;
    }

    public IRender getTemplateDelegate()
    {
        return new IRender()
        {
            public void render(IMarkupWriter writer, IRequestCycle cycle)
            {
                writeTemplate(writer, cycle);
            }
        };
    }

    /**
     * Writes the HTML template for the component. When <jwc> tags are written, the id is made
     * a link (that selects the named component). We use some magic to accomplish this, creating
     * links as if we were a {@link DirectLink} component, and attributing those links to the
     * captive {@link DirectLink} component embedded here.
     */

    private void writeTemplate(IMarkupWriter writer, IRequestCycle cycle)
    {
        IComponent inspectedComponent = getInspectedComponent();
        ComponentTemplate template = null;

        try
        {
            template = getTemplateSource().getTemplate(cycle, inspectedComponent);
        }
        catch (Exception ex)
        {
            return;
        }

        writer.begin("pre");

        int count = template.getTokenCount();

        for (int i = 0; i < count; i++)
        {
            TemplateToken token = template.getToken(i);
            TokenType type = token.getType();

            if (type == TokenType.TEXT)
            {
                write(writer, (TextToken) token);
                continue;
            }

            if (type == TokenType.CLOSE)
            {
                write(writer, (CloseToken) token);

                continue;
            }

            if (token.getType() == TokenType.LOCALIZATION)
            {

                write(writer, (LocalizationToken) token);
                continue;
            }

            if (token.getType() == TokenType.OPEN)
            {
                boolean nextIsClose = (i + 1 < count)
                        && (template.getToken(i + 1).getType() == TokenType.CLOSE);

                write(writer, nextIsClose, (OpenToken) token);

                if (nextIsClose)
                    i++;

                continue;
            }

            // That's all the types known at this time.
        }

        writer.end(); //     }

    /** @since 3.0 * */

    private IComponent getInspectedComponent()
    {
        Inspector page = (Inspector) getPage();

        return page.getInspectedComponent();
    }

    /** @since 3.0 * */

    private void write(IMarkupWriter writer, TextToken token)
    {
        // Print the section of the template ... print() will
        // escape and invalid characters as HTML entities. Also,
        // we show the full stretch of text, not the trimmed version.

        writer.print(token.getTemplateDataAsString());
    }

    /** @since 3.0 * */

    private void write(IMarkupWriter writer, CloseToken token)
    {
        writer.begin("span");
        writer.attribute("class", "jwc-tag");

        writer.print("");

        writer.end(); // 
    }

    /** @since 3.0 * */

    private void write(IMarkupWriter writer, LocalizationToken token)
    {
        IComponent component = getInspectedComponent();

        writer.begin("span");
        writer.attribute("class", "jwc-tag");

        writer.print("');
        writer.begin("span");
        writer.attribute("class", "localized-string");

        writer.print(component.getMessages().getMessage(token.getKey()));
        writer.end(); // 

        writer.print("");

        writer.end(); // 
    }

    /** @since 3.0 * */

    private void write(IMarkupWriter writer, boolean nextIsClose, OpenToken token)
    {
        IComponent component = getInspectedComponent();
        IEngineService service = getDirectService();

        // Each id references a component embedded in the inspected component.
        // Get that component.

        String id = token.getId();
        IComponent embedded = component.getComponent(id);
        Object[] serviceParameters = new Object[]
        { embedded.getIdPath() };

        // Build a URL to select that component, as if by the captive
        // component itself (it's a Direct).

        DirectServiceParameter dsp = new DirectServiceParameter(this, serviceParameters);
        ILink link = service.getLink(false, dsp);

        writer.begin("span");
        writer.attribute("class", "jwc-tag");

        writer.print("<");
        writer.print(token.getTag());

        writer.print(" jwcid=\"");

        writer.begin("span");
        writer.attribute("class", "jwc-id");

        writer.begin("a");
        writer.attribute("href", link.getURL());
        writer.print(id);

        writer.end(); // 
        writer.end(); // 
        writer.print('"');

        Map attributes = token.getAttributesMap();

        if (attributes != null)
        {
            Iterator ii = attributes.entrySet().iterator();

            while (ii.hasNext())
            {
                Map.Entry e = (Map.Entry) ii.next();

                String value = (String) e.getValue();

                writer.print(' ');
                writer.print(e.getKey().toString());
                writer.print("=\"");
                writer.print(value);
                writer.print('"');
            }
        }

        // Collapse an open & close down to a single tag.

        if (nextIsClose)
            writer.print('/');

        writer.print('>');
        writer.end(); // 
    }

    /**
     * Invoked when a component id is clicked.
     */

    public void trigger(IRequestCycle cycle)
    {
        Inspector inspector = (Inspector) getPage();

        String componentId = (String) cycle.getListenerParameters()[0];
        inspector.selectComponent(componentId);

        IComponent newComponent = inspector.getInspectedComponent();

        // If the component is not a BaseComponent then it won't have
        // a template, so switch to the specification view.

        if (!(newComponent instanceof BaseComponent))
            inspector.setView(View.SPECIFICATION);
    }

    /**
     * Always returns true.
     * 
     * @since 2.3
     */

    public boolean isStateful()
    {
        return true;
    }
}