from pathlib import Path
from setuptools import find_packages, setup


def get_version():
    version_file = 'lagent/version.py'
    with open(version_file, encoding='utf-8') as f:
        exec(compile(f.read(), version_file, 'exec'))
    return locals()['__version__']


def parse_requirements(fname='requirements.txt', with_version=True):
    """Parse the package dependencies listed in a requirements file but strip
    specific version information.

    Args:
        fname (str): Path to requirements file.
        with_version (bool, default=False): If True, include version specs.
    Returns:
        info (list[str]): List of requirements items.
    CommandLine:
        python -c "import setup; print(setup.parse_requirements())"
    """
    import re
    import sys
    from os.path import exists

    require_fpath = fname

    def parse_line(line):
        """Parse information from a line in a requirements text file."""
        if line.startswith('-r '):
            # Allow specifying requirements in other files
            target = line.split(' ')[1]
            for info in parse_require_file(target):
                yield info
        else:
            info = {'line': line}
            if line.startswith('-e '):
                info['package'] = line.split('#egg=')[1]
            else:
                # Remove versioning from the package
                pat = '(' + '|'.join(['>=', '==', '>']) + ')'
                parts = re.split(pat, line, maxsplit=1)
                parts = [p.strip() for p in parts]

                info['package'] = parts[0]
                if len(parts) > 1:
                    op, rest = parts[1:]
                    if ';' in rest:
                        # Handle platform specific dependencies
                        # http://setuptools.readthedocs.io/en/latest/setuptools.html#declaring-platform-specific-dependencies
                        version, platform_deps = map(str.strip,
                                                     rest.split(';'))
                        info['platform_deps'] = platform_deps
                    else:
                        version = rest  # NOQA
                    info['version'] = (op, version)
            yield info

    def parse_require_file(fpath):
        with open(fpath) as f:
            for line in f.readlines():
                line = line.strip()
                if line and not line.startswith('#'):
                    yield from parse_line(line)

    def gen_packages_items():
        if exists(require_fpath):
            for info in parse_require_file(require_fpath):
                parts = [info['package']]
                if with_version and 'version' in info:
                    parts.extend(info['version'])
                if not sys.version.startswith('3.4'):
                    # apparently package_deps are broken in 3.4
                    platform_deps = info.get('platform_deps')
                    if platform_deps is not None:
                        parts.append(';' + platform_deps)
                item = ''.join(parts)
                yield item

    packages = list(gen_packages_items())
    return packages


if __name__ == '__main__':
    with Path(Path(__file__).parent,
              'README.md').open(encoding='utf-8') as file:
        long_description = file.read()

    setup(
        name='lagent',
        packages=find_packages(),
        include_package_data=True,
        version=get_version(),
        license='Apache 2.0',
        description='A lightweight framework for building LLM-based agents',
        long_description=long_description,
        long_description_content_type='text/markdown',
        data_files=[('.', ['README.md'])],
        keywords=['artificial general intelligence', 'agent', 'agi', 'llm'],
        url='https://github.com/InternLM/lagent',
        install_requires=parse_requirements('requirements/runtime.txt'),
        extras_require={
            'all': parse_requirements('requirements.txt'),
            'optional': parse_requirements('requirements/optional.txt'),
        },
    )