<?xml version="1.0" encoding="UTF-8"?>
<project name="ImagePrep" default="help" basedir=".">
  <!-- import all environment variables as env.* -->
  <property environment="env"/>

  <!-- ensure required environment variables are set -->
  <macrodef name="env-require">
    <attribute name="name"/>
    <sequential>
      <fail message="Environment variable @{name} not set!">
        <condition>
          <not><isset property="env.@{name}"/></not>
        </condition>
      </fail>
    </sequential>
  </macrodef>
  <env-require name="JRE_HOME"/>
  <env-require name="KOTLIN_HOME"/>
  <env-require name="OSDEP_HOME"/>

  <!-- cribbed from https://stackoverflow.com/questions/7129672/uppercase-lowercase-capitalize-an-ant-property -->
  <scriptdef language="javascript" name="toLowerCase">
    <attribute name="value" />
    <attribute name="target" />
    <![CDATA[
      "use strict";
      project.setProperty( attributes.get( "target" ),
                           attributes.get( "value" ).toLowerCase() );
    ]]>
  </scriptdef>

  <!-- Define the properties used by the build -->
  <property name="app.name"      value="${ant.project.name}"/>
  <toLowerCase target="lc.app.name" value="${app.name}"/>
  <property name="app.version"   value="1.00"/>
  <property name="app.domain"    value="name.blackcap.${lc.app.name}"/>
  <property name="app.entry"     value="${app.domain}.MainKt"/>
  <property name="app.copyright" value="Copyright © 2020, David W. Barts."/>
  <property name="jar.name"      value="${basedir}/${lc.app.name}.jar"/>
  <property name="work.jar"      value="${basedir}/work.jar"/>
  <property name="lib.home"      value="${basedir}/lib"/>
  <property name="src.home"      value="${basedir}/src"/>
  <property name="dist.home"     value="${basedir}/dist"/>
  <property name="jvm.version"   value="1.8"/>

  <!-- define the kotlin task -->
  <property name="kotlin.lib" value="${env.KOTLIN_HOME}/lib"/>
  <typedef resource="org/jetbrains/kotlin/ant/antlib.xml"
           classpath="${kotlin.lib}/kotlin-ant.jar"/>

  <!-- help message -->
  <target name="help">
    <echo>You can use the following targets:</echo>
    <echo> </echo>
    <echo>  help    : (default) Prints this message </echo>
    <echo>  all     : Cleans, compiles, and stages application</echo>
    <echo>  clean   : Deletes work directories</echo>
    <echo>  compile : Compiles servlets into class files</echo>
    <echo>  jar     : Make JAR file.</echo>
    <echo> </echo>
    <echo>For example, to clean, compile, and package all at once, run:</echo>
    <echo>prompt> ant all </echo>
  </target>

  <!-- Define the CLASSPATH -->
  <target name="classpath">
    <path id="compile.classpath">
      <pathelement location="${src.home}"/>
    </path>
  </target>

  <!-- make needed directories -->
  <target name="mkdirs">
    <mkdir dir="${dist.home}"/>
  </target>

  <!-- remove old cruft -->
  <target name="clean">
    <delete includeEmptyDirs="true" failonerror="false">
      <fileset dir="${dist.home}" includes="**/*"/>
    </delete>
  </target>

  <!-- rename files containing OS-dependant code -->
  <target name="osdep">
    <exec executable="${env.JRE_HOME}/bin/java" failonerror="true">
      <arg value="-jar"/>
      <arg file="${env.OSDEP_HOME}/osdep.jar"/>
      <arg value="${src.home}"/>
    </exec>
  </target>

  <!-- do everything but install -->
  <target name="all" depends="jar"
          description="Clean work dirs, compile, make JAR."/>

  <!-- compile *.kt to *.class -->
  <target name="compile" depends="mkdirs,osdep,classpath"
          description="Compile Java sources to ${work.home}">
    <kotlinc src="${src.home}" output="${work.jar}"
             classpathref="compile.classpath">
      <compilerarg line="-jvm-target ${jvm.version}"/>
    </kotlinc>
  </target>

  <!-- make .jar file -->
  <target name="jar" depends="compile" description="Create JAR file.">
    <jar destfile="${jar.name}">
      <manifest>
        <attribute name="Main-Class" value="${app.entry}"/>
      </manifest>
      <!-- <zipgroupfileset dir="${lib.home}" includes="*.jar"/> -->
      <zipfileset src="${work.jar}"/>
      <zipfileset dir="${src.home}" includes="**/*.properties,**/*.html"/>
    </jar>
  </target>

</project>