"""The build configuration file for Python-Poppler-Qt5, used by sip."""

from os.path import join
import re
import subprocess
from pyqtbuild import PyQtBindings, PyQtProject
from sipbuild import Option
import PyQt5


class PythonPopplerQt5(PyQtProject):
    """The Project class."""

    def __init__(self):
        super().__init__()
        self.bindings_factories = [PopplerQt5Bindings]

    def update(self, tool):
        """Allows SIP to find PyQt5 .sip files."""
        super().update(tool)
        self.sip_include_dirs.append(join(PyQt5.__path__[0], 'bindings'))


class PopplerQt5Bindings(PyQtBindings):
    """The Poppler-Qt5 Bindings class."""

    def __init__(self, project):
        super().__init__(project, name='Poppler-Qt5',
                         sip_file='poppler-qt5.sip',
                         qmake_QT=['xml'])

    def get_options(self):
        """Our custom options that a user can pass to sip-build."""
        options = super().get_options()
        options.append(
            Option('poppler_version',
                   help='version of the poppler library',
                   metavar='VERSION'))
        return options

    @staticmethod
    def run_pkg_config(option):
        output = subprocess.check_output(
            ['pkg-config', option, 'poppler-qt5'],
            universal_newlines=True)
        return output.rstrip()

    def apply_user_defaults(self, tool):
        # Set include_dirs, library_dirs and libraries based on pkg-config data
        cflags = self.run_pkg_config('--cflags-only-I').split()
        libs = self.run_pkg_config('--libs').split()
        self.include_dirs.extend(
            flag[2:] for flag in cflags if flag.startswith('-I'))
        self.library_dirs.extend(
            flag[2:] for flag in libs if flag.startswith('-L'))
        self.libraries.extend(
            flag[2:] for flag in libs if flag.startswith('-l'))

        # Generate version.sip file
        if self.poppler_version is not None:
            poppler_qt5_version = self.poppler_version
        else:
            poppler_qt5_version = self.run_pkg_config('--modversion')
        poppler_qt5_version = tuple(map(int, poppler_qt5_version.split('.')))
        python_poppler_qt5_version = self.project.version_str.split('.')
        format_dict = {
            'vlen': 'i' * len(python_poppler_qt5_version),
            'vargs': ', '.join(python_poppler_qt5_version),
            'pvlen': 'i' * len(poppler_qt5_version),
            'pvargs': ', '.join(map(str, poppler_qt5_version)),
        }
        with open('version.sip.in') as template_file:
            version_sip_template = template_file.read()
        with open('version.sip', 'w') as version_file:
            version_file.write(version_sip_template.format(**format_dict))

        # Add Poppler version tag
        if poppler_qt5_version:
            with open('timeline.sip') as timeline_file:
                timeline = timeline_file.read()
            for match in re.finditer(r'POPPLER_V(\d+)_(\d+)_(\d+)', timeline):
                if poppler_qt5_version < tuple(map(int, match.group(1, 2, 3))):
                    break
                tag = match.group()
        else:
            tag = 'POPPLER_V0_20_0'
        self.tags.append(tag)
        super().apply_user_defaults(tool)