#!/usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2006-2008 (ita)

"""
Java support

Javac is one of the few compilers that behaves very badly:
* it outputs files where it wants to (-d is only for the package root)
* it recompiles files silently behind your back
* it outputs an undefined amount of files (inner classes)

Fortunately, the convention makes it possible to use the build dir without
too many problems for the moment

Inner classes must be located and cleaned when a problem arise,
for the moment waf does not track the production of inner classes.

Adding all the files to a task and executing it if any of the input files
change is only annoying for the compilation times

Compilation can be run using Jython[1] rather than regular Python. Instead of
running one of the following commands:
    ./waf configure
    python waf configure
You would have to run:
    java -jar /path/to/jython.jar waf configure

[1] http://www.jython.org/
"""

import os, re
from Configure import conf
import TaskGen, Task, Utils, Options, Build
from TaskGen import feature, before, taskgen

class_check_source = '''
public class Test {
	public static void main(String[] argv) {
		Class lib;
		if (argv.length < 1) {
			System.err.println("Missing argument");
			System.exit(77);
		}
		try {
			lib = Class.forName(argv[0]);
		} catch (ClassNotFoundException e) {
			System.err.println("ClassNotFoundException");
			System.exit(1);
		}
		lib = null;
		System.exit(0);
	}
}
'''

@feature('jar')
@before('apply_core')
def jar_files(self):
	basedir = getattr(self, 'basedir', '.')
	destfile = getattr(self, 'destfile', 'test.jar')
	jaropts = getattr(self, 'jaropts', [])
	jarcreate = getattr(self, 'jarcreate', 'cf')

	dir = self.path.find_dir(basedir)
	if not dir: raise

	jaropts.append('-C')
	jaropts.append(dir.abspath(self.env))
	jaropts.append('.')

	out = self.path.find_or_declare(destfile)

	tsk = self.create_task('jar_create')
	tsk.set_outputs(out)
	tsk.inputs = [x for x in dir.find_iter(src=0, bld=1) if x.id != out.id]
	tsk.env['JAROPTS'] = jaropts
	tsk.env['JARCREATE'] = jarcreate

@feature('javac')
@before('apply_core')
def apply_java(self):
	Utils.def_attrs(self, jarname='', jaropts='', classpath='',
		sourcepath='.', srcdir='.', source_re='**/*.java',
		jar_mf_attributes={}, jar_mf_classpath=[])

	if getattr(self, 'source_root', None):
		# old stuff
		self.srcdir = self.source_root


	nodes_lst = []

	if not self.classpath:
		if not self.env['CLASSPATH']:
			self.env['CLASSPATH'] = '..' + os.pathsep + '.'
	else:
		self.env['CLASSPATH'] = self.classpath

	srcdir_node = self.path.find_dir(self.srcdir)
	if not srcdir_node:
		raise Utils.WafError('could not find srcdir %r' % self.srcdir)

	src_nodes = [x for x in srcdir_node.ant_glob(self.source_re, flat=False)]
	bld_nodes = [x.change_ext('.class') for x in src_nodes]

	self.env['OUTDIR'] = [srcdir_node.bldpath(self.env)]

	tsk = self.create_task('javac')
	tsk.set_inputs(src_nodes)
	tsk.set_outputs(bld_nodes)

	if getattr(self, 'compat', None):
		tsk.env.append_value('JAVACFLAGS', ['-source', self.compat])

	if hasattr(self, 'sourcepath'):
		fold = [self.path.find_dir(x) for x in self.to_list(self.sourcepath)]
		names = os.pathsep.join([x.srcpath() for x in fold])
	else:
		names = srcdir_node.srcpath()

	if names:
		tsk.env.append_value('JAVACFLAGS', ['-sourcepath', names])

	if self.jarname:
		jtsk = self.create_task('jar_create', bld_nodes, self.path.find_or_declare(self.jarname))
		jtsk.set_run_after(tsk)

		if not self.env.JAROPTS:
			if self.jaropts:
				self.env.JAROPTS = self.jaropts
			else:
				dirs = '.'
				self.env.JAROPTS = ['-C', ''.join(self.env['OUTDIR']), dirs]

Task.simple_task_type('jar_create', '${JAR} ${JARCREATE} ${TGT} ${JAROPTS}', color='GREEN', shell=False)
cls = Task.simple_task_type('javac', '${JAVAC} -classpath ${CLASSPATH} -d ${OUTDIR} ${JAVACFLAGS} ${SRC}', shell=False)
cls.color = 'BLUE'
def post_run_javac(self):
	"""this is for cleaning the folder
	javac creates single files for inner classes
	but it is not possible to know which inner classes in advance"""

	par = {}
	for x in self.inputs:
		par[x.parent.id] = x.parent

	inner = {}
	for k in par.values():
		path = k.abspath(self.env)
		lst = os.listdir(path)

		for u in lst:
			if u.find('$') >= 0:
				inner_class_node = k.find_or_declare(u)
				inner[inner_class_node.id] = inner_class_node

	to_add = set(inner.keys()) - set([x.id for x in self.outputs])
	for x in to_add:
		self.outputs.append(inner[x])

	self.cached = True # disable the cache here - inner classes are a problem
	return Task.Task.post_run(self)
cls.post_run = post_run_javac

def detect(conf):
	# If JAVA_PATH is set, we prepend it to the path list
	java_path = conf.environ['PATH'].split(os.pathsep)
	v = conf.env

	if 'JAVA_HOME' in conf.environ:
		java_path = [os.path.join(conf.environ['JAVA_HOME'], 'bin')] + java_path
		conf.env['JAVA_HOME'] = [conf.environ['JAVA_HOME']]

	for x in 'javac java jar'.split():
		conf.find_program(x, var=x.upper(), path_list=java_path)
		conf.env[x.upper()] = conf.cmd_to_list(conf.env[x.upper()])
	v['JAVA_EXT'] = ['.java']

	if 'CLASSPATH' in conf.environ:
		v['CLASSPATH'] = conf.environ['CLASSPATH']

	if not v['JAR']: conf.fatal('jar is required for making java packages')
	if not v['JAVAC']: conf.fatal('javac is required for compiling java classes')
	v['JARCREATE'] = 'cf' # can use cvf

@conf
def check_java_class(self, classname, with_classpath=None):
	"""Check if the specified java class is installed"""

	import shutil

	javatestdir = '.waf-javatest'

	classpath = javatestdir
	if self.env['CLASSPATH']:
		classpath += os.pathsep + self.env['CLASSPATH']
	if isinstance(with_classpath, str):
		classpath += os.pathsep + with_classpath

	shutil.rmtree(javatestdir, True)
	os.mkdir(javatestdir)

	java_file = open(os.path.join(javatestdir, 'Test.java'), 'w')
	java_file.write(class_check_source)
	java_file.close()

	# Compile the source
	Utils.exec_command(self.env['JAVAC'] + [os.path.join(javatestdir, 'Test.java')], shell=False)

	# Try to run the app
	cmd = self.env['JAVA'] + ['-cp', classpath, 'Test', classname]
	self.log.write("%s\n" % str(cmd))
	found = Utils.exec_command(cmd, shell=False, log=self.log)

	self.check_message('Java class %s' % classname, "", not found)

	shutil.rmtree(javatestdir, True)

	return found

@conf
def check_jni_headers(conf):
	"""
	Check for jni headers and libraries

	On success the environment variable xxx_JAVA is added for uselib
	"""

	if not conf.env.CC_NAME and not conf.env.CXX_NAME:
		conf.fatal('load a compiler first (gcc, g++, ..)')

	if not conf.env.JAVA_HOME:
		conf.fatal('set JAVA_HOME in the system environment')

	# jni requires the jvm
	javaHome = conf.env['JAVA_HOME'][0]

	b = Build.BuildContext()
	b.load_dirs(conf.srcdir, conf.blddir)
	dir = b.root.find_dir(conf.env.JAVA_HOME[0] + '/include')
	f = dir.ant_glob('**/(jni|jni_md).h', flat=False)
	incDirs = [x.parent.abspath() for x in f]

	dir = b.root.find_dir(conf.env.JAVA_HOME[0])
	f = dir.ant_glob('**/*jvm.(so|dll)', flat=False)
	libDirs = [x.parent.abspath() for x in f] or [javaHome]

	for i, d in enumerate(libDirs):
		if conf.check(header_name='jni.h', define_name='HAVE_JNI_H', lib='jvm',
				libpath=d, includes=incDirs, uselib_store='JAVA', uselib='JAVA'):
			break
	else:
		conf.fatal('could not find lib jvm in %r (see config.log)' % libDirs)

