/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */


/**
* Apache S4 Application Build File
*
* Use this script to buils and package S4 apps.
*
* Run 'gradle install' on the s4 project to publish to your local maven repo.
*
* TODO: This should probably be distributed as an s4 plugin for Gradle.
* TODO: There seem to be to be similarities with the war and jetty plugins. (war -> s4r, jetty -> s4Run).
* We should make it easy to test the app from this script by a running a test task that starts and stops
* an s4 server. See: http://www.gradle.org/releases/1.0-milestone-3/docs/userguide/userguide_single.html#war_plugin
*
* This is an interesting discussion:
* http://gradle.1045684.n5.nabble.com/Exclude-properties-file-from-war-td3365147.html
*
*/

/* Set the destination where we want to install the apps. */
//s4AppInstallDir = "/tmp/s4Apps" // TODO: decide how to standarize dirs, use env var?

project.ext["s4AppInstallDir"] = hasProperty('appsDir') ? "$appsDir" : "/tmp/appsDir"

project.ext["s4Version"] = '0.5.0-incubating'
description = 'Apache S4 App'
//defaultTasks 'installS4R'
project.ext["archivesBaseName"] = "$project.name"
project.ext["distRootFolder"] = "$archivesBaseName-${-> version}"


// Append the suffix 'SNAPSHOT' when the build is not for release.
//version = new Version(major: 0, minor: 0, bugfix: 0, isRelease: false)
group = 'org.apache.s4'

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin:'application'

mainClassName = "org.apache.s4.core.Main"

/* The app classname is set automatically from the source files. */
def appClassname = ''

/* Set Java version. */
sourceCompatibility = 1.6
targetCompatibility = 1.6

repositories {
    mavenLocal()
    mavenCentral()
    mavenRepo name: "gson", url: "http://google-gson.googlecode.com/svn/mavenrepo"

    /* Add lib dir as a repo. Some jar files that are not available
     in a public repo are distributed in the lib dir. */
    flatDir name: 'libDir', dirs: "$rootDir/lib"
}

/* All project libraries must be defined here. */
project.ext["libraries"] = [
           twitter4j_core:     'org.twitter4j:twitter4j-core:2.2.5',
           twitter4j_stream:   'org.twitter4j:twitter4j-stream:2.2.5',
           s4_base:            'org.apache.s4:s4-base:0.5.0-incubating',
           s4_comm:            'org.apache.s4:s4-comm:0.5.0-incubating',
           s4_core:            'org.apache.s4:s4-core:0.5.0-incubating'
       ]


dependencies {

   /* S4 Platform. We only need the API, not the transitive dependencies. */
//    s4Libs.each {  module ->
//        compile( module ) //{ transitive = false }
//        s4API( module )
//    }

   compile (libraries.s4_base)
   compile (libraries.s4_comm)
   compile (libraries.s4_core)
   compile (libraries.twitter4j_core)
   compile (libraries.twitter4j_stream)


}

/* Set the manifest attributes for the S4 archive here.
*  TODO: separate custom properties from std ones and set custom properties at the top of the build script.
*/
manifest.mainAttributes(
       provider: 'gradle',
       'Implementation-Url': 'http://incubator.apache.org/projects/s4.html',
       'Implementation-Version': version,
       'Implementation-Vendor': 'Apache S4',
       'Implementation-Vendor-Id': 's4app',
       'S4-App-Class': appClassname, // gets set by the s4r task.
       'S4-Version': s4Version
       )

project.ext["appDependencies"] = ( configurations.compile )

// external dependencies will be available in the /lib directory of the s4r
task copyDependenciesToLib(type: Copy) {
    into project.libsDir.path+"/lib"
    from configurations.runtime
}

// app jar will be available from the /app directory of the s4r
task buildProjectJar() {
	dependsOn jar {
		destinationDir file(project.libsDir.path + "/app")
		from sourceSets.main.output
	}
}


/* This task will extract all the class files and create a fat jar. We set the manifest and the extension to make it an S4 archive file. */
// TODO: exclude schema files as needed (not critical) see: http://forums.gradle.org/gradle/topics/using_gradle_to_fat_jar_a_spring_project
// TODO: exclude s4 platform jars
task s4r(type: Jar) {
   dependsOn cleanCopyDependenciesToLib, copyDependenciesToLib, cleanBuildProjectJar, buildProjectJar
   from { project.libsDir }
   manifest = project.manifest
   extension = 's4r'
   exclude '*.s4r'

   /* Set class name in manifest. Parse source files until we find a class that extends App.
    * Get fully qualified Java class name and set attribute in Manifest.
    */
   sourceSets.main.allSource.files.each {  File file ->
       if (appClassname =="" || appClassname == "UNKNOWN") {
           // only execute the closure for this file if we haven't already found the app class name
           appClassname = getAppClassname(file)
           if(appClassname != "") {
               manifest.mainAttributes('S4-App-Class': appClassname)
           }
       }
   }

   if (appClassname == "UNKNOWN") {

       println "Couldn't find App class in source files...aborting."
       exit(1)
   }
}

/* List the artifacts that will br added to the s4 archive (and explode if needed). */
s4r << {
   appDependencies.each { File file -> println 'Adding to s4 archive: ' + file.name }
   configurations.archives.allArtifacts.files.each { println 'Adding to s4 archive: ' + it.name }

   /* This is for debugging. */
   //configurations.s4All.each { File file -> println 's4All: ' + file.name }
   //deployableDependencies.each { File file -> println 'Deploy: ' + file.name }

   // more debugging statements.
   //sourceSets.main.compileClasspath.each { File file -> println 'compileClasspath: ' + file.name }

}

/* Install the S4 archive to the install directory. */
task installS4R (type: Copy) {
   dependsOn s4r
   from s4r.archivePath
   into s4AppInstallDir
}

/* Generates the gradlew scripts.
http://www.gradle.org/1.0-milestone-3/docs/userguide/gradle_wrapper.html */
task wrapper(type: Wrapper) { gradleVersion = '1.0' }

task cp << {
    description='dumps the classpath for running a class from this project, into a \'classpath.txt\' file in the current directory'
    new File("classpath.txt").write(sourceSets.main.runtimeClasspath.asPath)
}


/* Parse source file to get the app classname so we can use it in the manifest.
* TODO: Use a real Java parser. (This is not skippong comments for example.)
*/
def getAppClassname(file) {
   def classname = "UNKNOWN"
   def lines= file.readLines()
   def packageName = ""
   for(line in lines) {

       def pn = line =~ /.*package\s+([\w\.]+)\s*;.*/
       if(pn) {
           packageName = pn[0][1] + "."
       }

       def an = line =~ /.*public\s+class\s+(\w+)\s+extends.+App.*\{/
       if (an) {
           classname = packageName + an[0][1]
           println "Found app class name: " + classname
           break
       }

   }
   classname
}

class Version {
   int major
   int minor
   int bugfix
   boolean isRelease

   String toString() {
       "$major.$minor.$bugfix${isRelease ? '' : '-SNAPSHOT'}"
   }
}