from typing import Callable as _Callable
from misc.codegen.lib import schema as _schema
import inspect as _inspect
from dataclasses import dataclass as _dataclass


class _ChildModifier(_schema.PropertyModifier):
    def modify(self, prop: _schema.Property):
        if prop.type is None or prop.type[0].islower():
            raise _schema.Error("Non-class properties cannot be children")
        prop.is_child = True


@_dataclass
class _DocModifier(_schema.PropertyModifier):
    doc: str

    def modify(self, prop: _schema.Property):
        if "\n" in self.doc or self.doc[-1] == ".":
            raise _schema.Error("No newlines or trailing dots are allowed in doc, did you intend to use desc?")
        prop.doc = self.doc


@_dataclass
class _DescModifier(_schema.PropertyModifier):
    description: str

    def modify(self, prop: _schema.Property):
        prop.description = _schema.split_doc(self.description)


def include(source: str):
    # add to `includes` variable in calling context
    _inspect.currentframe().f_back.f_locals.setdefault(
        "__includes", []).append(source)


class _Namespace:
    """ simple namespacing mechanism """

    def __init__(self, **kwargs):
        self.__dict__.update(kwargs)


qltest = _Namespace()
ql = _Namespace()
cpp = _Namespace()
synth = _Namespace()


@_dataclass
class _Pragma(_schema.PropertyModifier):
    """ A class or property pragma.
    For properties, it functions similarly to a `_PropertyModifier` with `|`, adding the pragma.
    For schema classes it acts as a python decorator with `@`.
    """
    pragma: str

    def __post_init__(self):
        namespace, _, name = self.pragma.partition('_')
        setattr(globals()[namespace], name, self)

    def modify(self, prop: _schema.Property):
        prop.pragmas.append(self.pragma)

    def __call__(self, cls: type) -> type:
        """ use this pragma as a decorator on classes """
        if "_pragmas" in cls.__dict__:  # not using hasattr as we don't want to land on inherited pragmas
            cls._pragmas.append(self.pragma)
        else:
            cls._pragmas = [self.pragma]
        return cls


class _Optionalizer(_schema.PropertyModifier):
    def modify(self, prop: _schema.Property):
        K = _schema.Property.Kind
        if prop.kind != K.SINGLE:
            raise _schema.Error(
                "Optional should only be applied to simple property types")
        prop.kind = K.OPTIONAL


class _Listifier(_schema.PropertyModifier):
    def modify(self, prop: _schema.Property):
        K = _schema.Property.Kind
        if prop.kind == K.SINGLE:
            prop.kind = K.REPEATED
        elif prop.kind == K.OPTIONAL:
            prop.kind = K.REPEATED_OPTIONAL
        else:
            raise _schema.Error(
                "Repeated should only be applied to simple or optional property types")


class _TypeModifier:
    """ Modifies types using get item notation """

    def __init__(self, modifier: _schema.PropertyModifier):
        self.modifier = modifier

    def __getitem__(self, item):
        return item | self.modifier


_ClassDecorator = _Callable[[type], type]


def _annotate(**kwargs) -> _ClassDecorator:
    def f(cls: type) -> type:
        for k, v in kwargs.items():
            setattr(cls, f"_{k}", v)
        return cls

    return f


boolean = "boolean"
int = "int"
string = "string"

predicate = _schema.predicate_marker
optional = _TypeModifier(_Optionalizer())
list = _TypeModifier(_Listifier())

child = _ChildModifier()
doc = _DocModifier
desc = _DescModifier

use_for_null = _annotate(null=True)

_Pragma("qltest_skip")
_Pragma("qltest_collapse_hierarchy")
_Pragma("qltest_uncollapse_hierarchy")

ql.default_doc_name = lambda doc: _annotate(doc_name=doc)
_Pragma("ql_internal")

_Pragma("cpp_skip")


def group(name: str = "") -> _ClassDecorator:
    return _annotate(group=name)


synth.from_class = lambda ref: _annotate(ipa=_schema.IpaInfo(
    from_class=_schema.get_type_name(ref)))
synth.on_arguments = lambda **kwargs: _annotate(
    ipa=_schema.IpaInfo(on_arguments={k: _schema.get_type_name(t) for k, t in kwargs.items()}))