class GrowlerGrailsPlugin {
    // the plugin version
    def version = "0.2"
    // the version or versions of Grails the plugin is designed for
    def grailsVersion = "1.3.7 > *"
    // the other plugins this plugin depends on
    def dependsOn = [ "jquery": "1.3 > *"]
    // resources that are excluded from plugin packaging
    def pluginExcludes = [
            "grails-app/views/error.gsp",
            "grails-app/views/idnex.gsp"
    ]

    def author = "Matthew Taylor"
    def authorEmail = "rhyolight@gmail.com"
    def title = "Growler"
    def description = '''\\
Uses jquery, and the jGrowl jquery plugin to allow Growl-like notifications from remote function calls.
'''

    // URL to the plugin's documentation
    def documentation = "http://grails.org/Growler+Plugin"

    def doWithSpring = {
        // TODO Implement runtime spring config (optional)
    }

    def doWithApplicationContext = { applicationContext ->
        replaceRemoteFunction(applicationContext)
    }

    def onChange = { event ->
        // TODO Implement code that is executed when any artefact that this plugin is
        // watching is modified and reloaded. The event contains: event.source,
        // event.application, event.manager, event.ctx, and event.plugin.
    }

    def onConfigChange = { event ->
        // TODO Implement code that is executed when the project configuration changes.
        // The event is the same as for 'onChange'.
    }
    
    /**
     * Replaces the JavascriptTagLib.remoteFunction with one that will handle growl attributes, or if there are none,
     * defer to the original remoteFunction method.
     */
    private replaceRemoteFunction(applicationContext) {
        def jsTagLib = applicationContext.getBean('org.codehaus.groovy.grails.plugins.web.taglib.JavascriptTagLib')
        // cache the old remoteFunction to use if we don't need to Growl
        def oldRemoteFunction = jsTagLib.remoteFunction
        // the new growling remoteFunction
        def growlingRemoteFunction = { attrs ->
            // use growl if specified
            if (attrs.growl && attrs.growl == 'true') {
                // jquery ajax call that will use the response within a Growler notification
                out << """\$.ajax({
                   type: 'POST',
                   url: '${createLink(attrs)}',
                   success: function(msg){
                       \$.jGrowl( msg );
                   },
                   failure: function(msg) {
                       \$.jGrowl( 'Something FAILED!: ' + msg );
                   }
                 });"""
            } 
            // otherwise, do it the normal way
            else {
                oldRemoteFunction(attrs)
            }
        }
        growlingRemoteFunction.delegate = jsTagLib
        growlingRemoteFunction.resolveStrategy = Closure.DELEGATE_FIRST
        // provide the new remoteFunction within the metaClass of JavascriptTagLib
        jsTagLib.metaClass.getRemoteFunction = { 
            return growlingRemoteFunction 
        }
    }
}