"""hug/types.py

Defines hugs built-in supported types / validators

Copyright (C) 2016  Timothy Edmund Crosley

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and
to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

"""
from __future__ import absolute_import

import uuid as native_uuid
from decimal import Decimal
from distutils.version import LooseVersion

import hug._empty as empty
from hug import introspect
from hug.exceptions import InvalidTypeData
from hug.json_module import json as json_converter

MARSHMALLOW_MAJOR_VERSION = None
try:
    import marshmallow
    from marshmallow import ValidationError

    MARSHMALLOW_MAJOR_VERSION = getattr(
        marshmallow, "__version_info__", LooseVersion(marshmallow.__version__).version
    )[0]
except ImportError:
    # Just define the error that is never raised so that Python does not complain.
    class ValidationError(Exception):
        pass


class Type(object):
    """Defines the base hug concept of a type for use in function annotation.
       Override `__call__` to define how the type should be transformed and validated
    """

    _hug_type = True
    _sub_type = None
    _accept_context = False

    def __init__(self):
        pass

    def __call__(self, value):
        raise NotImplementedError("To implement a new type __call__ must be defined")


def create(
    doc=None,
    error_text=None,
    exception_handlers=empty.dict,
    extend=Type,
    chain=True,
    auto_instance=True,
    accept_context=False,
):
    """Creates a new type handler with the specified type-casting handler"""
    extend = extend if type(extend) == type else type(extend)

    def new_type_handler(function):
        class NewType(extend):
            __slots__ = ()
            _accept_context = accept_context

            if chain and extend != Type:
                if error_text or exception_handlers:
                    if not accept_context:

                        def __call__(self, value):
                            try:
                                value = super(NewType, self).__call__(value)
                                return function(value)
                            except Exception as exception:
                                for take_exception, rewrite in exception_handlers.items():
                                    if isinstance(exception, take_exception):
                                        if isinstance(rewrite, str):
                                            raise ValueError(rewrite)
                                        else:
                                            raise rewrite(value)
                                if error_text:
                                    raise ValueError(error_text)
                                raise exception

                    else:
                        if extend._accept_context:

                            def __call__(self, value, context):
                                try:
                                    value = super(NewType, self).__call__(value, context)
                                    return function(value, context)
                                except Exception as exception:
                                    for take_exception, rewrite in exception_handlers.items():
                                        if isinstance(exception, take_exception):
                                            if isinstance(rewrite, str):
                                                raise ValueError(rewrite)
                                            else:
                                                raise rewrite(value)
                                    if error_text:
                                        raise ValueError(error_text)
                                    raise exception

                        else:

                            def __call__(self, value, context):
                                try:
                                    value = super(NewType, self).__call__(value)
                                    return function(value, context)
                                except Exception as exception:
                                    for take_exception, rewrite in exception_handlers.items():
                                        if isinstance(exception, take_exception):
                                            if isinstance(rewrite, str):
                                                raise ValueError(rewrite)
                                            else:
                                                raise rewrite(value)
                                    if error_text:
                                        raise ValueError(error_text)
                                    raise exception

                else:
                    if not accept_context:

                        def __call__(self, value):
                            value = super(NewType, self).__call__(value)
                            return function(value)

                    else:
                        if extend._accept_context:

                            def __call__(self, value, context):
                                value = super(NewType, self).__call__(value, context)
                                return function(value, context)

                        else:

                            def __call__(self, value, context):
                                value = super(NewType, self).__call__(value)
                                return function(value, context)

            else:
                if not accept_context:
                    if error_text or exception_handlers:

                        def __call__(self, value):
                            try:
                                return function(value)
                            except Exception as exception:
                                for take_exception, rewrite in exception_handlers.items():
                                    if isinstance(exception, take_exception):
                                        if isinstance(rewrite, str):
                                            raise ValueError(rewrite)
                                        else:
                                            raise rewrite(value)
                                if error_text:
                                    raise ValueError(error_text)
                                raise exception

                    else:

                        def __call__(self, value):
                            return function(value)

                else:
                    if error_text or exception_handlers:

                        def __call__(self, value, context):
                            try:
                                return function(value, context)
                            except Exception as exception:
                                for take_exception, rewrite in exception_handlers.items():
                                    if isinstance(exception, take_exception):
                                        if isinstance(rewrite, str):
                                            raise ValueError(rewrite)
                                        else:
                                            raise rewrite(value)
                                if error_text:
                                    raise ValueError(error_text)
                                raise exception

                    else:

                        def __call__(self, value, context):
                            return function(value, context)

        NewType.__doc__ = function.__doc__ if doc is None else doc
        if auto_instance and not (
            introspect.arguments(NewType.__init__, -1)
            or introspect.takes_kwargs(NewType.__init__)
            or introspect.takes_args(NewType.__init__)
        ):
            return NewType()
        return NewType

    return new_type_handler


def accept(kind, doc=None, error_text=None, exception_handlers=empty.dict, accept_context=False):
    """Allows quick wrapping of any Python type cast function for use as a hug type annotation"""
    return create(
        doc,
        error_text,
        exception_handlers=exception_handlers,
        chain=False,
        accept_context=accept_context,
    )(kind)


number = accept(int, "A whole number", "Invalid whole number provided")
float_number = accept(float, "A float number", "Invalid float number provided")
decimal = accept(Decimal, "A decimal number", "Invalid decimal number provided")
boolean = accept(
    bool, "Providing any value will set this to true", "Invalid boolean value provided"
)
uuid = accept(native_uuid.UUID, "A Universally Unique IDentifier", "Invalid UUID provided")


class Text(Type):
    """Basic text / string value"""

    __slots__ = ()

    def __call__(self, value):
        if type(value) in (list, tuple) or value is None:
            raise ValueError("Invalid text value provided")
        return str(value)


text = Text()


class SubTyped(type):
    def __getitem__(cls, sub_type):
        class TypedSubclass(cls):
            _sub_type = sub_type

        return TypedSubclass


class Multiple(Type, metaclass=SubTyped):
    """Multiple Values"""

    __slots__ = ()

    def __call__(self, value):
        as_multiple = value if isinstance(value, list) else [value]
        if self._sub_type:
            return [self._sub_type(item) for item in as_multiple]
        return as_multiple


class DelimitedList(Type, metaclass=SubTyped):
    """Defines a list type that is formed by delimiting a list with a certain character or set of characters"""

    def __init__(self, using=","):
        super().__init__()
        self.using = using

    @property
    def __doc__(self):
        return '''Multiple values, separated by "{0}"'''.format(self.using)

    def __call__(self, value):
        value_list = value if type(value) in (list, tuple) else value.split(self.using)
        if self._sub_type:
            value_list = [self._sub_type(val) for val in value_list]
        return value_list


class SmartBoolean(type(boolean)):
    """Accepts a true or false value"""

    __slots__ = ()

    def __call__(self, value):
        if type(value) == bool or value in (None, 1, 0):
            return bool(value)

        value = value.lower()
        if value in ("true", "t", "1"):
            return True
        elif value in ("false", "f", "0", ""):
            return False

        raise KeyError("Invalid value passed in for true/false field")


class InlineDictionary(Type, metaclass=SubTyped):
    """A single line dictionary, where items are separated by commas and key:value are separated by a pipe"""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.key_type = self.value_type = None
        if self._sub_type:
            if type(self._sub_type) in (tuple, list):
                if len(self._sub_type) >= 2:
                    self.key_type, self.value_type = self._sub_type[:2]
            else:
                self.key_type = self._sub_type

    def __call__(self, string):
        dictionary = {}
        for key, value in (item.split(":") for item in string.split("|")):
            key, value = key.strip(), value.strip()
            dictionary[self.key_type(key) if self.key_type else key] = (
                self.value_type(value) if self.value_type else value
            )
        return dictionary


class OneOf(Type):
    """Ensures the value is within a set of acceptable values"""

    __slots__ = ("values",)

    def __init__(self, values):
        self.values = values

    @property
    def __doc__(self):
        return "Accepts one of the following values: ({0})".format("|".join(self.values))

    def __call__(self, value):
        if not value in self.values:
            raise KeyError(
                "Invalid value passed. The accepted values are: ({0})".format("|".join(self.values))
            )
        return value


class Mapping(OneOf):
    """Ensures the value is one of an acceptable set of values mapping those values to a Python equivelent"""

    __slots__ = ("value_map",)

    def __init__(self, value_map):
        self.value_map = value_map
        self.values = value_map.keys()

    @property
    def __doc__(self):
        return "Accepts one of the following values: ({0})".format("|".join(self.values))

    def __call__(self, value):
        if not value in self.values:
            raise KeyError(
                "Invalid value passed. The accepted values are: ({0})".format("|".join(self.values))
            )
        return self.value_map[value]


class JSON(Type):
    """Accepts a JSON formatted data structure"""

    __slots__ = ()

    def __call__(self, value):
        if type(value) in (str, bytes):
            try:
                return json_converter.loads(value)
            except Exception:
                raise ValueError("Incorrectly formatted JSON provided")
        if type(value) is list:
            # If Falcon is set to comma-separate entries, this segment joins them again.
            try:
                fixed_value = ",".join(value)
                return json_converter.loads(fixed_value)
            except Exception:
                raise ValueError("Incorrectly formatted JSON provided")
        else:
            return value


class Multi(Type):
    """Enables accepting one of multiple type methods"""

    __slots__ = ("types",)

    def __init__(self, *types):
        self.types = types

    @property
    def __doc__(self):
        type_strings = (type_method.__doc__ for type_method in self.types)
        return "Accepts any of the following value types:{0}\n".format("\n  - ".join(type_strings))

    def __call__(self, value):
        for type_method in self.types:
            try:
                return type_method(value)
            except BaseException:
                pass
        raise ValueError(self.__doc__)


class InRange(Type):
    """Accepts a number within a lower and upper bound of acceptable values"""

    __slots__ = ("lower", "upper", "convert")

    def __init__(self, lower, upper, convert=number):
        self.lower = lower
        self.upper = upper
        self.convert = convert

    @property
    def __doc__(self):
        return "{0} that is greater or equal to {1} and less than {2}".format(
            self.convert.__doc__, self.lower, self.upper
        )

    def __call__(self, value):
        value = self.convert(value)
        if value < self.lower:
            raise ValueError("'{0}' is less than the lower limit {1}".format(value, self.lower))
        if value >= self.upper:
            raise ValueError("'{0}' reaches the limit of {1}".format(value, self.upper))
        return value


class LessThan(Type):
    """Accepts a number within a lower and upper bound of acceptable values"""

    __slots__ = ("limit", "convert")

    def __init__(self, limit, convert=number):
        self.limit = limit
        self.convert = convert

    @property
    def __doc__(self):
        return "{0} that is less than {1}".format(self.convert.__doc__, self.limit)

    def __call__(self, value):
        value = self.convert(value)
        if not value < self.limit:
            raise ValueError("'{0}' must be less than {1}".format(value, self.limit))
        return value


class GreaterThan(Type):
    """Accepts a value above a given minimum"""

    __slots__ = ("minimum", "convert")

    def __init__(self, minimum, convert=number):
        self.minimum = minimum
        self.convert = convert

    @property
    def __doc__(self):
        return "{0} that is greater than {1}".format(self.convert.__doc__, self.minimum)

    def __call__(self, value):
        value = self.convert(value)
        if not value > self.minimum:
            raise ValueError("'{0}' must be greater than {1}".format(value, self.minimum))
        return value


class Length(Type):
    """Accepts a a value that is within a specific length limit"""

    __slots__ = ("lower", "upper", "convert")

    def __init__(self, lower, upper, convert=text):
        self.lower = lower
        self.upper = upper
        self.convert = convert

    @property
    def __doc__(self):
        return "{0} that has a length longer or equal to {1} and less then {2}".format(
            self.convert.__doc__, self.lower, self.upper
        )

    def __call__(self, value):
        value = self.convert(value)
        length = len(value)
        if length < self.lower:
            raise ValueError(
                "'{0}' is shorter than the lower limit of {1}".format(value, self.lower)
            )
        if length >= self.upper:
            raise ValueError(
                "'{0}' is longer then the allowed limit of {1}".format(value, self.upper)
            )
        return value


class ShorterThan(Type):
    """Accepts a text value shorter than the specified length limit"""

    __slots__ = ("limit", "convert")

    def __init__(self, limit, convert=text):
        self.limit = limit
        self.convert = convert

    @property
    def __doc__(self):
        return "{0} with a length of no more than {1}".format(self.convert.__doc__, self.limit)

    def __call__(self, value):
        value = self.convert(value)
        length = len(value)
        if not length < self.limit:
            raise ValueError(
                "'{0}' is longer then the allowed limit of {1}".format(value, self.limit)
            )
        return value


class LongerThan(Type):
    """Accepts a value up to the specified limit"""

    __slots__ = ("limit", "convert")

    def __init__(self, limit, convert=text):
        self.limit = limit
        self.convert = convert

    @property
    def __doc__(self):
        return "{0} with a length longer than {1}".format(self.convert.__doc__, self.limit)

    def __call__(self, value):
        value = self.convert(value)
        length = len(value)
        if not length > self.limit:
            raise ValueError("'{0}' must be longer than {1}".format(value, self.limit))
        return value


class CutOff(Type):
    """Cuts off the provided value at the specified index"""

    __slots__ = ("limit", "convert")

    def __init__(self, limit, convert=text):
        self.limit = limit
        self.convert = convert

    @property
    def __doc__(self):
        return "'{0}' with anything over the length of {1} being ignored".format(
            self.convert.__doc__, self.limit
        )

    def __call__(self, value):
        return self.convert(value)[: self.limit]


class Chain(Type):
    """type for chaining multiple types together"""

    __slots__ = ("types",)

    def __init__(self, *types):
        self.types = types

    def __call__(self, value):
        for type_function in self.types:
            value = type_function(value)
        return value


class Nullable(Chain):
    """A Chain types that Allows None values"""

    __slots__ = ("types",)

    def __init__(self, *types):
        self.types = types

    def __call__(self, value):
        if value is None:
            return None
        else:
            return super(Nullable, self).__call__(value)


class TypedProperty(object):
    """class for building property objects for schema objects"""

    __slots__ = ("name", "type_func")

    def __init__(self, name, type_func):
        self.name = "_" + name
        self.type_func = type_func

    def __get__(self, instance, cls):
        return getattr(instance, self.name, None)

    def __set__(self, instance, value):
        setattr(instance, self.name, self.type_func(value))

    def __delete__(self, instance):
        raise AttributeError("Can't delete attribute")


class NewTypeMeta(type):
    """Meta class to turn Schema objects into format usable by hug"""

    __slots__ = ()

    def __init__(cls, name, bases, nmspc):
        cls._types = {
            attr: getattr(cls, attr)
            for attr in dir(cls)
            if getattr(getattr(cls, attr), "_hug_type", False)
        }
        slots = getattr(cls, "__slots__", ())
        slots = set(slots)
        for attr, type_func in cls._types.items():
            slots.add("_" + attr)
            slots.add(attr)
            prop = TypedProperty(attr, type_func)
            setattr(cls, attr, prop)
        cls.__slots__ = tuple(slots)
        super(NewTypeMeta, cls).__init__(name, bases, nmspc)


class Schema(object, metaclass=NewTypeMeta):
    """Schema for creating complex types using hug types"""

    __slots__ = ()

    def __new__(cls, json, *args, **kwargs):
        if json.__class__ == cls:
            return json
        else:
            return super(Schema, cls).__new__(cls)

    def __init__(self, json, force=False):
        if self != json:
            for (key, value) in json.items():
                if force:
                    key = "_" + key
                setattr(self, key, value)


json = JSON()


class MarshmallowInputSchema(Type):
    """Allows using a Marshmallow Schema directly in a hug input type annotation"""

    __slots__ = "schema"

    def __init__(self, schema):
        self.schema = schema

    @property
    def __doc__(self):
        return self.schema.__doc__ or self.schema.__class__.__name__

    def __call__(self, value, context):
        self.schema.context = context
        # In marshmallow 2 schemas return tuple (`data`, `errors`) upon loading. They might also raise on invalid data
        # if configured so, but will still return a tuple.
        # In marshmallow 3 schemas always raise Validation error on load if input data is invalid and a single
        # value `data` is returned.
        if MARSHMALLOW_MAJOR_VERSION is None or MARSHMALLOW_MAJOR_VERSION == 2:
            value, errors = (
                self.schema.loads(value) if isinstance(value, str) else self.schema.load(value)
            )
        else:
            errors = {}
            try:
                value = (
                    self.schema.loads(value) if isinstance(value, str) else self.schema.load(value)
                )
            except ValidationError as e:
                errors = e.messages

        if errors:
            raise InvalidTypeData(
                "Invalid {0} passed in".format(self.schema.__class__.__name__), errors
            )
        return value


class MarshmallowReturnSchema(Type):
    """Allows using a Marshmallow Schema directly in a hug return type annotation"""

    __slots__ = ("schema",)

    def __init__(self, schema):
        self.schema = schema

    @property
    def context(self):
        return self.schema.context

    @context.setter
    def context(self, context):
        self.schema.context = context

    @property
    def __doc__(self):
        return self.schema.__doc__ or self.schema.__class__.__name__

    def __call__(self, value):
        # In marshmallow 2 schemas return tuple (`data`, `errors`) upon loading. They might also raise on invalid data
        # if configured so, but will still return a tuple.
        # In marshmallow 3 schemas always raise Validation error on load if input data is invalid and a single
        # value `data` is returned.
        if MARSHMALLOW_MAJOR_VERSION is None or MARSHMALLOW_MAJOR_VERSION == 2:
            value, errors = self.schema.dump(value)
        else:
            errors = {}
            try:
                value = self.schema.dump(value)
            except ValidationError as e:
                errors = e.messages

        if errors:
            raise InvalidTypeData(
                "Invalid {0} passed in".format(self.schema.__class__.__name__), errors
            )
        return value


multiple = Multiple()
smart_boolean = SmartBoolean()
inline_dictionary = InlineDictionary()
comma_separated_list = DelimitedList(using=",")


# NOTE: These forms are going to be DEPRECATED, here for backwards compatibility only
delimited_list = DelimitedList
one_of = OneOf
mapping = Mapping
multi = Multi
in_range = InRange
less_than = LessThan
greater_than = GreaterThan
length = Length
shorter_than = ShorterThan
longer_than = LongerThan
cut_off = CutOff
