/*
 * Copyright 2008-2010 the original author or authors.
 *
 * 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
 */

import org.codehaus.groovy.grails.plugins.support.GrailsPluginUtils
import org.codehaus.groovy.grails.commons.ControllerArtefactHandler

import org.apache.commons.logging.LogFactory

import org.codehaus.groovy.grails.plugins.j2d.Gfx

/**
 * Enables graphics capabilities on controllers.<br/>
 * Contains code from JSecurityGrailsPlugin by Peter Ledbrook.
 *
 * @author Andres Almiray
 */
class J2dGrailsPlugin {
    static LOG = LogFactory.getLog("org.codehaus.groovy.grails.plugins.j2d.J2dGrailsPlugin")

    def version = "0.4.2"
    def grailsVersion = "1.2.0 > *"
    def author = "Andres Almiray"
    def authorEmail = "aalmiray@users.sourceforge.net"
    def title = "Enables Java2D rendering using GfxBuilder"
    def description = """
J2D plugin allows you to draw images on the fly with Java2D, using
GfxBuilder under the covers (http://griffon.codehaus.org/GfxBuilder)
"""
    def documentation = "http://grails.org/J2D+Plugin"

    def dependsOn = [core:grailsVersion]
    def loadAfter = ['controllers']
    def observe = ['controllers']
	
    def doWithSpring = {
        // TODO Implement runtime spring config (optional)
    }
   
    def doWithApplicationContext = { applicationContext ->
        // TODO Implement post initialization spring config (optional)		
    }

    def doWithWebDescriptor = { xml ->
        // TODO Implement additions to web.xml (optional)
    }
	                                      
    /**
     * Adds renderImage() to controllers.
     */
    def doWithDynamicMethods = { ctx ->
        // following snippet taken from JSecurityGrailsPlugin
        if( manager?.hasGrailsPlugin("controllers") ){
            application.controllerClasses.each { controllerClass ->
                LOG.info "Adding gfx capabilities to ${controllerClass.clazz.name}"
                processController(controllerClass)
            }
        }
    }
	
    def onChange = { event ->
        // following snippet taken from JSecurityGrailsPlugin
        if( application.isControllerClass(event.source) ){
            // Get the GrailsClass instance for the controller.
            def controllerClass = application.getControllerClass(event.source?.name)
            // If no GrailsClass can be found, i.e. 'controllerClass'
            // is null, then this is a new controller.
            if( controllerClass == null ){
                controllerClass = application.addArtefact(ControllerArtefactHandler.TYPE, event.source)
            }
            // Now update dynamic methods for this controller.
            LOG.info "Reconfiguring gfx capabilities on ${controllerClass.shortName}"
            processController(controllerClass)
        }
    }

    def onConfigChange = { event ->
        // TODO Implement code that is executed when the project configuration changes.
        // The event is the same as for 'onChange'.
    }

    def processController(controllerClass) {
        controllerClass.metaClass.renderImage = { Map props, Closure cls ->
            Gfx.renderImage(delegate, props, cls)
        }
    }
}