# !/usr/bin/env python3

# Copyright 2014-2020 Brockmann Consult GmbH
#
# 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.

import glob
import os
import os.path
import platform
import shutil
import subprocess
import sys
import unittest
from distutils import log
from distutils.cmd import Command
from distutils.util import get_platform
from setuptools import setup
from setuptools.command.install import install
from setuptools.command.install_lib import install_lib
from setuptools.command.test import test
from setuptools.extension import Extension

import jpyutil

__author__ = jpyutil.__author__
__copyright__ = jpyutil.__copyright__
__license__ = jpyutil.__license__
__version__ = jpyutil.__version__

base_dir = os.path.dirname(os.path.relpath(__file__))
src_main_c_dir = os.path.join(base_dir, 'src', 'main', 'c')
src_test_py_dir = os.path.join(base_dir, 'src', 'test', 'python')


sources = [
    os.path.join(src_main_c_dir, 'jpy_module.c'),
    os.path.join(src_main_c_dir, 'jpy_diag.c'),
    os.path.join(src_main_c_dir, 'jpy_verboseexcept.c'),
    os.path.join(src_main_c_dir, 'jpy_conv.c'),
    os.path.join(src_main_c_dir, 'jpy_compat.c'),
    os.path.join(src_main_c_dir, 'jpy_jtype.c'),
    os.path.join(src_main_c_dir, 'jpy_jarray.c'),
    os.path.join(src_main_c_dir, 'jpy_jobj.c'),
    os.path.join(src_main_c_dir, 'jpy_jmethod.c'),
    os.path.join(src_main_c_dir, 'jpy_jfield.c'),
    os.path.join(src_main_c_dir, 'jni/org_jpy_PyLib.c'),
]

headers = [
    os.path.join(src_main_c_dir, 'jpy_module.h'),
    os.path.join(src_main_c_dir, 'jpy_diag.h'),
    os.path.join(src_main_c_dir, 'jpy_conv.h'),
    os.path.join(src_main_c_dir, 'jpy_compat.h'),
    os.path.join(src_main_c_dir, 'jpy_jtype.h'),
    os.path.join(src_main_c_dir, 'jpy_jarray.h'),
    os.path.join(src_main_c_dir, 'jpy_jobj.h'),
    os.path.join(src_main_c_dir, 'jpy_jmethod.h'),
    os.path.join(src_main_c_dir, 'jpy_jfield.h'),
    os.path.join(src_main_c_dir, 'jni/org_jpy_PyLib.h'),
]

# Python unit tests that just use Java runtime classes (rt.jar)
python_java_rt_tests = [
    os.path.join(src_test_py_dir, 'jpy_rt_test.py'),
    os.path.join(src_test_py_dir, 'jpy_mt_test.py'),
    os.path.join(src_test_py_dir, 'jpy_diag_test.py'),
    # os.path.join(src_test_py_dir, 'jpy_perf_test.py'),
]

# Python unit tests that require jpy test fixture classes to be accessible
# via JRE system property '-Djava.class.path=target/test-classes'
python_java_jpy_tests = [
    os.path.join(src_test_py_dir, 'jpy_array_test.py'),
    os.path.join(src_test_py_dir, 'jpy_field_test.py'),
    os.path.join(src_test_py_dir, 'jpy_retval_test.py'),
    os.path.join(src_test_py_dir, 'jpy_exception_test.py'),
    os.path.join(src_test_py_dir, 'jpy_overload_test.py'),
    os.path.join(src_test_py_dir, 'jpy_typeconv_test.py'),
    os.path.join(src_test_py_dir, 'jpy_typeres_test.py'),
    os.path.join(src_test_py_dir, 'jpy_modretparam_test.py'),
    os.path.join(src_test_py_dir, 'jpy_translation_test.py'),
    os.path.join(src_test_py_dir, 'jpy_gettype_test.py'),
]

# e.g. jdk_home_dir = '/home/marta/jdk1.7.0_15'
jdk_home_dir = jpyutil.find_jdk_home_dir()
if jdk_home_dir is None:
    log.error('Error: environment variable "JAVA_HOME" must be set to a JDK (>= v1.7) installation directory')
    exit(1)

log.info('Building a %s-bit library for a %s system with JDK at %s' % (
    '64' if jpyutil.PYTHON_64BIT else '32', platform.system(), jdk_home_dir))

jvm_dll_file = jpyutil.find_jvm_dll_file(jdk_home_dir)
if not jvm_dll_file:
    log.error('Error: Cannot find any JVM shared library')
    exit(1)

lib_dir = os.path.join(base_dir, 'lib')
jpy_jar_file = os.path.join(lib_dir, 'jpy.jar')
jvm_dll_dir = os.path.dirname(jvm_dll_file)

include_dirs = [src_main_c_dir, os.path.join(jdk_home_dir, 'include')]
library_dirs = [jvm_dll_dir]
libraries = [jpyutil.JVM_LIB_NAME]

define_macros = []
extra_link_args = []
extra_compile_args = []

if platform.system() == 'Windows':
    define_macros += [('WIN32', '1')]
    include_dirs += [os.path.join(jdk_home_dir, 'include', 'win32')]
    library_dirs += [os.path.join(jdk_home_dir, 'lib')]
elif platform.system() == 'Linux':
    include_dirs += [os.path.join(jdk_home_dir, 'include', 'linux')]
    libraries += ['dl']
    extra_link_args += ['-Xlinker', '-rpath', jvm_dll_dir]
elif platform.system() == 'Darwin':
    include_dirs += [os.path.join(jdk_home_dir, 'include', 'darwin')]
    library_dirs += [os.path.join(sys.exec_prefix, 'lib')]
    extra_link_args += ['-Xlinker', '-rpath', jvm_dll_dir]


# ----------- Functions -------------
def _build_dir():
    # this is hacky, but use distutils logic to get build dir. see: distutils.command.build
    plat = '.%s-%d.%d' % (get_platform(), sys.version_info.major, sys.version_info.minor)
    log.info('Platform specifier: "%s"' % plat)
    path = os.path.join('build', 'lib' + plat)
    log.info('Build directory path: "%s"' % path)
    return path


def package_maven():
    """ Run maven package lifecycle """
    if not os.getenv('JAVA_HOME'):
        # make sure Maven uses the same JDK which we have used to compile
        # and link the C-code
        os.environ['JAVA_HOME'] = jdk_home_dir

    mvn_goal = 'package'
    log.info("Executing Maven goal '" + mvn_goal + "'")
    code = subprocess.call(['mvn', 'clean', mvn_goal, '-DskipTests'],
                           shell=platform.system() == 'Windows')
    if code:
        exit(code)

    # Copy JAR results to lib/*.jar

    if not os.path.exists(lib_dir):
        os.mkdir(lib_dir)
    target_dir = os.path.join(base_dir, 'target')
    jar_files = glob.glob(os.path.join(target_dir, '*.jar'))
    jar_files = [f for f in jar_files
                 if not (f.endswith('-sources.jar')
                         or f.endswith('-javadoc.jar'))]
    if not jar_files:
        log.error('Maven did not generate any JAR artifacts')
        exit(1)
    for jar_file in jar_files:
        build_dir = _build_dir()
        if os.path.exists(build_dir):
            log.info('Build directory "%s" exists.' % build_dir)
        else:
            log.info('Creating missing build directory "%s".' % build_dir)
            os.makedirs(build_dir)
        log.info("Copying " + jar_file + " -> " + build_dir + "")
        shutil.copy(jar_file, build_dir)


def _read(filename):
    """ Helper function for reading in project files """
    with open(filename, encoding='UTF-8') as file:
        return file.read()


def test_python_java_rt():
    """ Run Python test cases against Java runtime classes. """
    sub_env = {'PYTHONPATH': _build_dir()}

    log.info('Executing Python unit tests (against Java runtime classes)...')
    return jpyutil._execute_python_scripts(python_java_rt_tests, env=sub_env)


def test_python_java_classes():
    """ Run Python tests against JPY test classes """
    sub_env = {'PYTHONPATH': _build_dir()}

    log.info('Executing Python unit tests (against JPY test classes)...')
    return jpyutil._execute_python_scripts(python_java_jpy_tests, env=sub_env)


def test_maven():
    jpy_config = os.path.join(_build_dir(), 'jpyconfig.properties')
    mvn_args = '-DargLine=-Xmx512m -Djpy.config=' + jpy_config + ' -Djpy.debug=true'
    log.info("Executing Maven goal 'test' with arg line " + repr(mvn_args))
    code = subprocess.call(['mvn', 'test', mvn_args], shell=platform.system() == 'Windows')
    return code == 0


def _write_jpy_config(target_dir=None, install_dir=None):
    """
    Write out a well-formed jpyconfig.properties file for easier Java
    integration in a given location.
    """
    if not target_dir:
        target_dir = _build_dir()

    args = [sys.executable,
            os.path.join(target_dir, 'jpyutil.py'),
            '--jvm_dll', jvm_dll_file,
            '--java_home', jdk_home_dir,
            '--log_level', 'DEBUG',
            '--req_java',
            '--req_py']
    if install_dir:
        args.append('--install_dir')
        args.append(install_dir)

    log.info('Writing jpy configuration to %s using install_dir %s' % (target_dir, install_dir))
    return subprocess.call(args)


def _copy_jpyutil():
    src = os.path.relpath(jpyutil.__file__)
    dest = _build_dir()
    log.info('Copying %s to %s' % (src, dest))
    shutil.copy(src, dest)


def _build_jpy():
    package_maven()
    _copy_jpyutil()
    _write_jpy_config()


def test_suite():
    suite = unittest.TestSuite()

    def test_python_with_java_runtime(self):
        assert 0 == test_python_java_rt()

    def test_python_with_java_classes(self):
        assert 0 == test_python_java_classes()

    def test_java(self):
        assert test_maven()

    suite.addTest(test_python_with_java_runtime)
    suite.addTest(test_python_with_java_classes)
    suite.addTest(test_java)

    return suite


class MavenBuildCommand(Command):
    """ Custom JPY Maven builder command """
    description = 'run Maven to generate JPY jar'
    user_options = []  # do not remove, needs to be stubbed out!

    def initialize_options(self):
        pass

    def finalize_options(self):
        pass

    def run(self):
        self.announce('Building JPY')
        _build_jpy()


class JpyBuildBeforeTest(test):
    """ Customization of SetupTools Install command for JPY """

    def run(self):
        self.run_command('build')
        self.run_command('maven')
        test.run(self)


class JpyInstallLib(install_lib):
    """ Custom install_lib command for getting install_dir """

    def run(self):
        _write_jpy_config(install_dir=self.install_dir)
        install_lib.run(self)


class JpyInstall(install):
    """ Custom install command to trigger Maven steps """

    def run(self):
        self.run_command('build')
        self.run_command('maven')
        install.run(self)


setup(name='jpy',
      description='Bi-directional Python-Java bridge',
      long_description=_read('README.md') + '\n\n' + _read('CHANGES.md'),
      version=__version__,
      platforms='Windows, Linux, Darwin',
      author=__author__,
      author_email='norman.fomferra@brockmann-consult.de',
      maintainer='Brockmann Consult GmbH',
      maintainer_email='norman.fomferra@brockmann-consult.de',
      license=__license__,
      url='https://github.com/bcdev/jpy',
      download_url='https://pypi.python.org/pypi/jpy/' + __version__,
      py_modules=['jpyutil'],
      ext_modules=[Extension('jpy',
                             sources=sources,
                             depends=headers,
                             include_dirs=include_dirs,
                             library_dirs=library_dirs,
                             libraries=libraries,
                             extra_link_args=extra_link_args,
                             extra_compile_args=extra_compile_args,
                             define_macros=define_macros),
                   Extension('jdl',
                             sources=[os.path.join(src_main_c_dir, 'jni/org_jpy_DL.c')],
                             depends=[os.path.join(src_main_c_dir, 'jni/org_jpy_DL.h')],
                             include_dirs=include_dirs,
                             library_dirs=library_dirs,
                             libraries=libraries,
                             extra_link_args=extra_link_args,
                             extra_compile_args=extra_compile_args,
                             define_macros=define_macros),
                   ],
      test_suite='setup.test_suite',
      cmdclass={
          'maven': MavenBuildCommand,
          'test': JpyBuildBeforeTest,
          'install': JpyInstall,
          'install_lib': JpyInstallLib
      },
      classifiers=['Development Status :: 4 - Beta',
                   # Indicate who your project is intended for
                   'Intended Audience :: Developers',

                   # Pick your license as you wish (should match "license" above)
                   'License :: OSI Approved :: Apache 2 License',

                   # Specify the Python versions you support here. In particular, ensure
                   # that you indicate whether you support Python 2, Python 3 or both.
                   'Programming Language :: Python :: 3.4',
                   'Programming Language :: Python :: 3.5',
                   'Programming Language :: Python :: 3.6',
                   'Programming Language :: Python :: 3.7',
                   'Programming Language :: Python :: 3.8'
                   ])
