import sys
import marshal
import contextlib
import dis


from . import _imp
from ._imp import find_module, PY_COMPILED, PY_FROZEN, PY_SOURCE
from .extern.packaging.version import Version


__all__ = ['Require', 'find_module']


class Require:
    """A prerequisite to building or installing a distribution"""

    def __init__(
        self, name, requested_version, module, homepage='', attribute=None, format=None
    ):
        if format is None and requested_version is not None:
            format = Version

        if format is not None:
            requested_version = format(requested_version)
            if attribute is None:
                attribute = '__version__'

        self.__dict__.update(locals())
        del self.self

    def full_name(self):
        """Return full package/distribution name, w/version"""
        if self.requested_version is not None:
            return '%s-%s' % (self.name, self.requested_version)
        return self.name

    def version_ok(self, version):
        """Is 'version' sufficiently up-to-date?"""
        return (
            self.attribute is None
            or self.format is None
            or str(version) != "unknown"
            and self.format(version) >= self.requested_version
        )

    def get_version(self, paths=None, default="unknown"):
        """Get version number of installed module, 'None', or 'default'

        Search 'paths' for module.  If not found, return 'None'.  If found,
        return the extracted version attribute, or 'default' if no version
        attribute was specified, or the value cannot be determined without
        importing the module.  The version is formatted according to the
        requirement's version format (if any), unless it is 'None' or the
        supplied 'default'.
        """

        if self.attribute is None:
            try:
                f, p, i = find_module(self.module, paths)
            except ImportError:
                return None
            if f:
                f.close()
            return default

        v = get_module_constant(self.module, self.attribute, default, paths)

        if v is not None and v is not default and self.format is not None:
            return self.format(v)

        return v

    def is_present(self, paths=None):
        """Return true if dependency is present on 'paths'"""
        return self.get_version(paths) is not None

    def is_current(self, paths=None):
        """Return true if dependency is present and up-to-date on 'paths'"""
        version = self.get_version(paths)
        if version is None:
            return False
        return self.version_ok(str(version))


def maybe_close(f):
    @contextlib.contextmanager
    def empty():
        yield
        return

    if not f:
        return empty()

    return contextlib.closing(f)


# Some objects are not available on some platforms.
# XXX it'd be better to test assertions about bytecode instead.
if not sys.platform.startswith('java') and sys.platform != 'cli':

    def get_module_constant(module, symbol, default=-1, paths=None):
        """Find 'module' by searching 'paths', and extract 'symbol'

        Return 'None' if 'module' does not exist on 'paths', or it does not define
        'symbol'.  If the module defines 'symbol' as a constant, return the
        constant.  Otherwise, return 'default'."""

        try:
            f, path, (suffix, mode, kind) = info = find_module(module, paths)
        except ImportError:
            # Module doesn't exist
            return None

        with maybe_close(f):
            if kind == PY_COMPILED:
                f.read(8)  # skip magic & date
                code = marshal.load(f)
            elif kind == PY_FROZEN:
                code = _imp.get_frozen_object(module, paths)
            elif kind == PY_SOURCE:
                code = compile(f.read(), path, 'exec')
            else:
                # Not something we can parse; we'll have to import it.  :(
                imported = _imp.get_module(module, paths, info)
                return getattr(imported, symbol, None)

        return extract_constant(code, symbol, default)

    def extract_constant(code, symbol, default=-1):
        """Extract the constant value of 'symbol' from 'code'

        If the name 'symbol' is bound to a constant value by the Python code
        object 'code', return that value.  If 'symbol' is bound to an expression,
        return 'default'.  Otherwise, return 'None'.

        Return value is based on the first assignment to 'symbol'.  'symbol' must
        be a global, or at least a non-"fast" local in the code block.  That is,
        only 'STORE_NAME' and 'STORE_GLOBAL' opcodes are checked, and 'symbol'
        must be present in 'code.co_names'.
        """
        if symbol not in code.co_names:
            # name's not there, can't possibly be an assignment
            return None

        name_idx = list(code.co_names).index(symbol)

        STORE_NAME = dis.opmap['STORE_NAME']
        STORE_GLOBAL = dis.opmap['STORE_GLOBAL']
        LOAD_CONST = dis.opmap['LOAD_CONST']

        const = default

        for byte_code in dis.Bytecode(code):
            op = byte_code.opcode
            arg = byte_code.arg

            if op == LOAD_CONST:
                const = code.co_consts[arg]
            elif arg == name_idx and (op == STORE_NAME or op == STORE_GLOBAL):
                return const
            else:
                const = default

        return None

    __all__ += ['get_module_constant', 'extract_constant']