"""JSON Encoding Rules (JER) codec.

"""

import time
import json
import binascii
import math
import datetime

from ..parser import EXTENSION_MARKER
from . import BaseType, format_bytes, ErrorWithLocation
from . import EncodeError
from . import DecodeError
from . import compiler
from . import format_or
from . import utc_time_to_datetime
from . import utc_time_from_datetime
from . import generalized_time_to_datetime
from . import generalized_time_from_datetime
from .compiler import enum_values_as_dict


class Type(BaseType):

    def set_size_range(self, minimum, maximum, has_extension_marker):
        pass


class StringType(Type):

    def __init__(self, name):
        super(StringType, self).__init__(name,
                                         self.__class__.__name__)

    def encode(self, data):
        return data

    def decode(self, data):
        return data


class MembersType(Type):

    def __init__(self,
                 name,
                 members,
                 type_name):
        super(MembersType, self).__init__(name, type_name)
        self.members = members

    def encode(self, data):
        values = {}

        for member in self.members:
            name = member.name

            if name in data:
                try:
                    value = member.encode(data[name])
                except ErrorWithLocation as e:
                    # Add member location
                    e.add_location(member)
                    raise e
            elif member.optional or member.has_default():
                continue
            else:
                raise EncodeError(
                    "{} member '{}' not found in {}.".format(
                        self.__class__.__name__,
                        name,
                        data))

            values[name] = value

        return values

    def decode(self, data):
        values = {}

        for member in self.members:
            name = member.name

            if name in data:
                try:
                    value = member.decode(data[name])
                except ErrorWithLocation as e:
                    # Add member location
                    e.add_location(member)
                    raise e
                values[name] = value
            elif member.optional:
                pass
            elif member.has_default():
                values[name] = member.get_default()

        return values

    def __repr__(self):
        return '{}({}, [{}])'.format(
            self.__class__.__name__,
            self.name,
            ', '.join([repr(member) for member in self.members]))


class Boolean(Type):

    def __init__(self, name):
        super(Boolean, self).__init__(name, 'BOOLEAN')

    def encode(self, data):
        return data

    def decode(self, data):
        return data


class Integer(Type):

    def __init__(self, name):
        super(Integer, self).__init__(name, 'INTEGER')

    def encode(self, data):
        return data

    def decode(self, data):
        return data


class Real(Type):

    def __init__(self, name):
        super(Real, self).__init__(name, 'REAL')

    def encode(self, data):
        if data == float('inf'):
            return 'INF'
        elif data == float('-inf'):
            return '-INF'
        elif math.isnan(data):
            return 'NaN'
        else:
            return data

    def decode(self, data):
        if isinstance(data, float):
            return data
        else:
            return {
                'INF': float('inf'),
                '-INF': float('-inf'),
                'NaN': float('nan'),
                '0': 0.0,
                '-0': 0.0
            }[data]


class Null(Type):

    def __init__(self, name):
        super(Null, self).__init__(name, 'NULL')

    def encode(self, data):
        return data

    def decode(self, data):
        return data


class BitString(Type):

    def __init__(self, name, minimum, maximum):
        super(BitString, self).__init__(name, 'BIT STRING')

        if minimum is None and maximum is None:
            self.size = None
        elif minimum == maximum:
            self.size = minimum
        else:
            self.size = None

    def encode(self, data):
        value = format_bytes(data[0]).upper()

        if self.size is None:
            value = {
                "value": value,
                "length": data[1]
            }

        return value

    def decode(self, data):
        if self.size is None:
            return (binascii.unhexlify(data['value']), data['length'])
        else:
            return (binascii.unhexlify(data), self.size)


class OctetString(Type):

    def __init__(self, name):
        super(OctetString, self).__init__(name, 'OCTET STRING')

    def encode(self, data):
        return format_bytes(data).upper()

    def decode(self, data):
        return binascii.unhexlify(data)


class ObjectIdentifier(Type):

    def __init__(self, name):
        super(ObjectIdentifier, self).__init__(name, 'OBJECT IDENTIFIER')

    def encode(self, data):
        return data

    def decode(self, data):
        return str(data)


class Enumerated(Type):

    def __init__(self, name, values, numeric):
        super(Enumerated, self).__init__(name, 'ENUMERATED')

        if numeric:
            self.values = {k: k for k in enum_values_as_dict(values)}
        else:
            self.values = {
                v: v for v in enum_values_as_dict(values).values()
            }

        self.has_extension_marker = (EXTENSION_MARKER in values)

    def format_values(self):
        return format_or(sorted(list(self.values)))

    def encode(self, data):
        try:
            value = self.values[data]
        except KeyError:
            raise EncodeError(
                "Expected enumeration value {}, but got '{}'.".format(
                    self.format_values(),
                    data))

        return value

    def decode(self, data):
        if data in self.values:
            return self.values[data]
        elif self.has_extension_marker:
            return None
        else:
            raise DecodeError(
                "Expected enumeration value {}, but got '{}'.".format(
                    self.format_values(),
                    data))


class Sequence(MembersType):

    def __init__(self, name, members):
        super(Sequence, self).__init__(name, members, 'SEQUENCE')


class SequenceOf(Type):

    def __init__(self, name, element_type):
        super(SequenceOf, self).__init__(name, 'SEQUENCE OF')
        self.element_type = element_type

    def encode(self, data):
        values = []

        for entry in data:
            value = self.element_type.encode(entry)
            values.append(value)

        return values

    def decode(self, data):
        values = []

        for element_data in data:
            value = self.element_type.decode(element_data)
            values.append(value)

        return values

    def __repr__(self):
        return 'SequenceOf({}, {})'.format(self.name,
                                           self.element_type)


class Set(MembersType):

    def __init__(self, name, members):
        super(Set, self).__init__(name, members, 'SET')


class SetOf(Type):

    def __init__(self, name, element_type):
        super(SetOf, self).__init__(name, 'SET OF')
        self.element_type = element_type

    def encode(self, data):
        values = []

        for entry in data:
            value = self.element_type.encode(entry)
            values.append(value)

        return values

    def decode(self, data):
        values = []

        for element_data in data:
            value = self.element_type.decode(element_data)
            values.append(value)

        return values

    def __repr__(self):
        return 'SetOf({}, {})'.format(self.name,
                                      self.element_type)


class Choice(Type):

    def __init__(self, name, members, has_extension_marker):
        super(Choice, self).__init__(name, 'CHOICE')
        self.members = members
        self.name_to_member = {member.name: member for member in self.members}
        self.has_extension_marker = has_extension_marker

    def format_names(self):
        return format_or(sorted([member.name for member in self.members]))

    def encode(self, data):
        try:
            member = self.name_to_member[data[0]]
        except KeyError:
            raise EncodeError(
                "Expected choice {}, but got '{}'.".format(
                    self.format_names(),
                    data[0]))
        try:
            return {member.name: member.encode(data[1])}
        except ErrorWithLocation as e:
            # Add member location
            e.add_location(member)
            raise e

    def decode(self, data):
        name, value = list(data.items())[0]

        if name in self.name_to_member:
            member = self.name_to_member[name]
        elif self.has_extension_marker:
            return (None, None)
        else:
            raise DecodeError(
                "Expected choice {}, but got '{}'.".format(
                    self.format_names(),
                    name))
        try:
            return (name, member.decode(value))
        except ErrorWithLocation as e:
            # Add member location
            e.add_location(member)
            raise e

    def __repr__(self):
        return 'Choice({}, [{}])'.format(
            self.name,
            ', '.join([repr(member) for member in self.members]))


class UTF8String(StringType):
    pass


class NumericString(StringType):
    pass


class PrintableString(StringType):
    pass


class IA5String(StringType):
    pass


class VisibleString(StringType):
    pass


class GeneralString(StringType):
    pass


class BMPString(StringType):
    pass


class GraphicString(StringType):
    pass


class UniversalString(StringType):
    pass


class TeletexString(StringType):
    pass


class ObjectDescriptor(GraphicString):
    pass


class UTCTime(StringType):

    def encode(self, data):
        return utc_time_from_datetime(data)

    def decode(self, data):
        return utc_time_to_datetime(data)


class GeneralizedTime(StringType):

    def encode(self, data):
        return generalized_time_from_datetime(data)

    def decode(self, data):
        return generalized_time_to_datetime(data)


class Date(StringType):

    def encode(self, data):
        return str(data)

    def decode(self, data):
        return datetime.date(*time.strptime(data, '%Y-%m-%d')[:3])


class TimeOfDay(StringType):

    def encode(self, data):
        return str(data)

    def decode(self, data):
        return datetime.time(*time.strptime(data, '%H:%M:%S')[3:6])


class DateTime(StringType):

    def encode(self, data):
        return str(data).replace(' ', 'T')

    def decode(self, data):
        return datetime.datetime(*time.strptime(data, '%Y-%m-%dT%H:%M:%S')[:6])


class Any(Type):

    def __init__(self, name):
        super(Any, self).__init__(name, 'ANY')

    def encode(self, _data):
        raise NotImplementedError('ANY is not yet implemented.')

    def decode(self, _data):
        raise NotImplementedError('ANY is not yet implemented.')


class Recursive(compiler.Recursive, Type):

    def __init__(self, name, type_name, module_name):
        super(Recursive, self).__init__(name, 'RECURSIVE')
        self.type_name = type_name
        self.module_name = module_name
        self._inner = None

    def set_inner_type(self, inner):
        self._inner = inner

    def encode(self, data):
        return self._inner.encode(data)

    def decode(self, data):
        return self._inner.decode(data)


class CompiledType(compiler.CompiledType):

    def encode(self, data, indent=None):
        try:
            dictionary = self._type.encode(data)
        except ErrorWithLocation as e:
            # Add member location
            e.add_location(self._type)
            raise e

        if indent is None:
            string = json.dumps(dictionary, separators=(',', ':'))
        else:
            string = json.dumps(dictionary, indent=indent)

        return string.encode('utf-8')

    def decode(self, data):
        try:
            return self._type.decode(json.loads(data.decode('utf-8')))
        except ErrorWithLocation as e:
            # Add member location
            e.add_location(self._type)
            raise e


class Compiler(compiler.Compiler):

    def process_type(self, type_name, type_descriptor, module_name):
        compiled_type = self.compile_type(type_name,
                                          type_descriptor,
                                          module_name)

        return CompiledType(compiled_type)

    def compile_type(self, name, type_descriptor, module_name):
        module_name = self.get_module_name(type_descriptor, module_name)
        type_name = type_descriptor['type']

        if type_name == 'SEQUENCE':
            members, _ = self.compile_members(
                type_descriptor['members'],
                module_name)
            compiled = Sequence(name, members)
        elif type_name == 'SEQUENCE OF':
            compiled = SequenceOf(name,
                                  self.compile_type('',
                                                    type_descriptor['element'],
                                                    module_name))
        elif type_name == 'SET':
            members, _ = self.compile_members(
                type_descriptor['members'],
                module_name)
            compiled = Set(name, members)
        elif type_name == 'SET OF':
            compiled = SetOf(name,
                             self.compile_type('',
                                               type_descriptor['element'],
                                               module_name))
        elif type_name == 'CHOICE':
            compiled = Choice(name,
                              *self.compile_members(
                                  type_descriptor['members'],
                                  module_name))
        elif type_name == 'INTEGER':
            compiled = Integer(name)
        elif type_name == 'REAL':
            compiled = Real(name)
        elif type_name == 'ENUMERATED':
            compiled = Enumerated(name,
                                  self.get_enum_values(type_descriptor,
                                                       module_name),
                                  self._numeric_enums)
        elif type_name == 'BOOLEAN':
            compiled = Boolean(name)
        elif type_name == 'OBJECT IDENTIFIER':
            compiled = ObjectIdentifier(name)
        elif type_name == 'OCTET STRING':
            compiled = OctetString(name)
        elif type_name == 'TeletexString':
            compiled = TeletexString(name)
        elif type_name == 'NumericString':
            compiled = NumericString(name)
        elif type_name == 'PrintableString':
            compiled = PrintableString(name)
        elif type_name == 'IA5String':
            compiled = IA5String(name)
        elif type_name == 'VisibleString':
            compiled = VisibleString(name)
        elif type_name == 'GeneralString':
            compiled = GeneralString(name)
        elif type_name == 'DATE':
            compiled = Date(name)
        elif type_name == 'TIME-OF-DAY':
            compiled = TimeOfDay(name)
        elif type_name == 'DATE-TIME':
            compiled = DateTime(name)
        elif type_name == 'UTF8String':
            compiled = UTF8String(name)
        elif type_name == 'BMPString':
            compiled = BMPString(name)
        elif type_name == 'GraphicString':
            compiled = GraphicString(name)
        elif type_name == 'UTCTime':
            compiled = UTCTime(name)
        elif type_name == 'UniversalString':
            compiled = UniversalString(name)
        elif type_name == 'GeneralizedTime':
            compiled = GeneralizedTime(name)
        elif type_name == 'BIT STRING':
            minimum, maximum, _ = self.get_size_range(type_descriptor,
                                                      module_name)
            compiled = BitString(name, minimum, maximum)
        elif type_name == 'ANY':
            compiled = Any(name)
        elif type_name == 'ANY DEFINED BY':
            compiled = Any(name)
        elif type_name == 'NULL':
            compiled = Null(name)
        elif type_name == 'EXTERNAL':
            members, _ = self.compile_members(
                self.external_type_descriptor()['members'],
                module_name)
            compiled = Sequence(name, members)
        elif type_name == 'ObjectDescriptor':
            compiled = ObjectDescriptor(name)
        else:
            if type_name in self.types_backtrace:
                compiled = Recursive(name,
                                     type_name,
                                     module_name)
                self.recursive_types.append(compiled)
            else:
                compiled = self.compile_user_type(name,
                                                  type_name,
                                                  module_name)

        return compiled


def compile_dict(specification, numeric_enums=False):
    return Compiler(specification, numeric_enums).process()


def decode_full_length(_data):
    raise DecodeError('Decode length is not supported for this codec.')
