from distutils.command.build import build
import os
import subprocess
import sys
from pathlib import Path
from setuptools import Extension, setup, find_packages
from setuptools.command.build_ext import build_ext


class CMakeExtension(Extension):
    def __init__(self, name):
        Extension.__init__(self, name, sources=[])

class CMakeBuild(build_ext):
    def run(self):
        try:
            out = subprocess.check_output(["cmake", "--version"])
        except:
            raise RuntimeError("CMake must be installed to build the following extensions: " + ", ".join(e.name for e in self.extensions))
        build_directory = os.path.abspath(self.build_temp)

        cmake_args = [
            '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=' + build_directory,
            '-DPYTHON_EXECUTABLE=' + sys.executable
        ]

        cfg = 'Debug' if self.debug else 'Release'
        build_args = ['--config', cfg]

        cmake_args += ['-DCMAKE_BUILD_TYPE=' + cfg]

        build_args += ['--', '-j2']
        self.build_args = build_args

        env = os.environ.copy()
        env['CXXFLAGS'] = '{} -DVERSION_INFO=\\"{}\\"'.format(
            env.get('CXXFLAGS', ''),
            self.distribution.get_version())
        if not os.path.exists(self.build_temp):
            os.makedirs(self.build_temp)

        # CMakeLists.txt is in the same directory as this setup.py file
        cmake_list_dir = os.path.abspath(os.path.dirname(__file__))
        print('-'*10, 'Running CMake prepare', '-'*40)
        subprocess.check_call(['cmake', cmake_list_dir] + cmake_args,
                              cwd=self.build_temp, env=env)

        print('-'*10, 'Building extensions', '-'*40)
        cmake_cmd = ['cmake', '--build', '.'] + self.build_args
        subprocess.check_call(cmake_cmd,
                              cwd=self.build_temp)

        # Move from build temp to final position
        for ext in self.extensions:
            self.move_output(ext)
    def move_output(self, ext):
        build_temp = Path(self.build_temp).resolve()
        dest_path = Path(self.get_ext_fullpath(ext.name)).resolve()
        source_path = build_temp / self.get_ext_filename(ext.name)
        dest_directory = dest_path.parents[0]
        dest_directory.mkdir(parents=True, exist_ok=True)
        self.copy_file(source_path, dest_path)

ext_modules = [
    CMakeExtension('vlfeat_py'),
]

setup(
    name='vlfeat_py',
    version='0.1.0',
    author='Royston E Tauro',
    author_email= 'tauro.royston@gmail.com',
    license= 'MIT',
    license_files = ('LICENSE',),
    url = 'https://www.github.com/lucasace/vlfeat_py',
    project_urls = {
        'Source': 'https://www.github.com/lucasace/vlfeat_py',
        'Tracker': 'https://www.github.com/lucasace/vlfeat_py/issues',
    },
    packages = find_packages(),
    ext_modules=ext_modules,
    cmdclass=dict(build_ext=CMakeBuild),
    zip_safe=False,
    install_requires = [
        'numpy',
    ],
)
        
