/*
* Copyright 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
* 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-SNAPSHOT'
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:'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-SNAPSHOT',
           s4_comm:            'org.apache.s4:s4-comm:0.5.0-SNAPSHOT',
           s4_core:            'org.apache.s4:s4-core:0.5.0-SNAPSHOT'
       ]


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 )

/* 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 schenma files as needed (not critical) see: http://forums.gradle.org/gradle/topics/using_gradle_to_fat_jar_a_spring_project
task s4r(type: Jar) {
   dependsOn jar
   from { appDependencies.collect { it.isDirectory() ? it : zipTree(it) } }
   from { configurations.archives.allArtifacts.files.collect { it.isDirectory() ? it : zipTree(it) } }
   manifest = project.manifest
   extension = '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-milestone-3' }

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'}"
   }
}