import sys
import os.path
from setuptools import setup, Extension, find_packages
from distutils.command.sdist import sdist as _sdist
from distutils.command.build_ext import build_ext as _build_ext


def no_cythonize(extensions, **_ignore):
    """Change .pyx to .c or .cpp (copied from Cython documentation)"""
    for extension in extensions:
        sources = []
        for sfile in extension.sources:
            path, ext = os.path.splitext(sfile)
            if ext in (".pyx", ".py"):
                if extension.language == "c++":
                    ext = ".cpp"
                else:
                    ext = ".c"
                sfile = path + ext
            sources.append(sfile)
        extension.sources[:] = sources


extensions = [
    Extension("tinyalign._core", sources=["src/tinyalign/_core.pyx"]),
]


class BuildExt(_build_ext):
    def run(self):
        # If we encounter a PKG-INFO file, then this is likely a .tar.gz/.zip
        # file retrieved from PyPI that already includes the pre-cythonized
        # extension modules, and then we do not need to run cythonize().
        if os.path.exists("PKG-INFO"):
            no_cythonize(extensions)
        else:
            # Otherwise, this is a 'developer copy' of the code, and then the
            # only sensible thing is to require Cython to be installed.
            from Cython.Build import cythonize

            self.extensions = cythonize(self.extensions)
        super().run()


class SDist(_sdist):
    def run(self):
        # Make sure the compiled Cython files in the distribution are up-to-date
        from Cython.Build import cythonize

        cythonize(extensions)
        super().run()


with open("README.md", encoding="utf-8") as f:
    long_description = f.read()

setup(
    name="tinyalign",
    setup_requires=["setuptools_scm"],  # Support pip versions that don't know about pyproject.toml
    use_scm_version={"write_to": "src/tinyalign/_version.py"},
    author="Marcel Martin",
    author_email="marcel.martin@scilifelab.se",
    url="https://github.com/marcelm/tinyalign/",
    description="Fast banded edit distance",
    long_description=long_description,
    long_description_content_type="text/markdown",
    license="MIT",
    packages=find_packages("src"),
    package_dir={"": "src"},
    ext_modules=extensions,
    cmdclass={"build_ext": BuildExt, "sdist": SDist},
    python_requires='>=3.6',
    classifiers=[
        "Development Status :: 3 - Alpha",
        "Intended Audience :: Science/Research",
        "License :: OSI Approved :: MIT License",
        "Natural Language :: English",
        "Programming Language :: Cython",
        "Programming Language :: Python :: 3",
        "Topic :: Scientific/Engineering :: Bio-Informatics",
    ],
)