# -*- coding: utf-8 -*-

import copy
import datetime
import ioex.datetimeex
import pytz
import re
import yaml
import yaml.representer

ioex.register_yaml_str_as_unicode_constructor(yaml.Loader)
ioex.register_yaml_unicode_as_str_representer(yaml.Dumper)
ioex.datetimeex.register_yaml_timestamp_constructor(yaml.Loader)
ioex.datetimeex.Duration.register_yaml_constructor(yaml.Loader)
ioex.datetimeex.Duration.register_yaml_representer(yaml.Dumper)
ioex.datetimeex.Period.register_yaml_constructor(yaml.Loader)
ioex.datetimeex.Period.register_yaml_representer(yaml.Dumper)

class _Object(object):

    def __eq__(self, other):
        return type(self) == type(other) and vars(self) == vars(other)

    def __ne__(self, other):
        return not (self == other)

class _YamlInitConstructor(_Object, yaml.YAMLObject):

    @classmethod
    def from_yaml(cls, loader, node):
        return cls(**loader.construct_mapping(node, deep = True))
        # return cls(**{
        #     k: unicode(v) if isinstance(v, str) else v
        #         for (k, v) in loader.construct_mapping(node, deep = True).items()
        #     })

    def __eq__(self, other):
        return (type(self) == type(other)
                and vars(self) == vars(other))

    def __ne__(self, other):
        return not (self == other)

class Figure(_YamlInitConstructor):

    yaml_tag = u"!figure"

    def __init__(self, value = None, unit = None):
        self.value = value
        self.unit = unit

    def get_value(self):
        return self._value

    def set_value(self, value):
        self._value = value

    """ use property() instead of decorator to enable overriding """
    value = property(get_value, set_value)

    def get_unit(self):
        return self._unit

    def set_unit(self, unit):
        assert type(unit) is unicode
        self._unit = unit

    """ use property() instead of decorator to enable overriding """
    unit = property(get_unit, set_unit)

    @classmethod
    def to_yaml(cls, dumper, figure):
        return dumper.represent_mapping(
                cls.yaml_tag,
                {'unit': figure.get_unit(), 'value': figure.get_value()},
                )

    def __sub__(self, other):
        assert type(self) == type(other)
        assert self.unit == other.unit
        result = copy.deepcopy(self)
        result.value -= other.value
        return result

class ScalarFigure(Figure):

    yaml_tag = u'!scalar'

    def get_value(self):
        return super(ScalarFigure, self).get_value()

    def set_value(self, value):
        assert type(value) is float
        super(ScalarFigure, self).set_value(value)

    """ use property() instead of decorator to enable overriding """
    value = property(get_value, set_value)

    @classmethod
    def from_yaml(cls, loader, node):
        attr = loader.construct_scalar(node).split(' ')
        return cls(
                value = float(attr[0]),
                unit = attr[1],
                )

    @classmethod
    def to_yaml(cls, dumper, s):
        return dumper.represent_scalar(
                cls.yaml_tag,
                '%s %s' % (repr(s.value), s.unit),
                )

class Distance(ScalarFigure):

    yaml_tag = u'!distance'

    @property
    def metres(self):
        if self.unit == 'km':
            return self.value * 1000
        else:
            raise Exception()

class Sum(ScalarFigure):

    yaml_tag = u'!sum'

    def __init__(self, value = None, currency = None, unit = None):
        if not currency is None and not unit is None:
            raise ValueError('either specify currency or unit')
        else:
            unit = currency if currency else unit
            super(Sum, self).__init__(
                    value = value, 
                    unit = currency if currency else unit,
                    )

    @property
    def currency(self):
        return self.unit

    def get_unit(self):
        return super(Sum, self).get_unit()

    def set_unit(self, currency):
        if currency == u'€':
            currency = u'EUR'
        if currency == u'US$':
            currency = u'USD'
        assert type(currency) is unicode
        assert currency in [u'EUR', u'USD']
        super(Sum, self).set_unit(currency)

    """ use property() instead of decorator to enable overriding """
    unit = property(get_unit, set_unit)

    @classmethod
    def from_yaml(cls, loader, node):
        attr = loader.construct_scalar(node).split(' ')
        return cls(
                value = float(attr[0]),
                currency = attr[1],
                )

    @staticmethod
    def parse_text(text):
        match = re.search(
            ur'^(?P<curr_pre>((US)?\$|€))(?P<value>-?\d+([\.,]\d{2})?)( (?P<currency>USD))?$',
            text,
            re.UNICODE,
            )
        assert not match is None, text
        attr = match.groupdict()
        currency = attr['currency'] if attr['currency'] else attr['curr_pre']
        if currency == u'$':
            currency = u'USD'
        return Sum(
                value = float(attr['value'].replace(',', '.')),
                currency = currency,
                )

class Discount(_YamlInitConstructor):

    yaml_tag = u'!discount'

    def __init__(
            self,
            name = None,
            amount = None,
            ):
        assert type(name) is unicode
        self.name = name
        assert type(amount) is Sum
        assert amount.value >= 0
        self.amount = amount

class Order(_YamlInitConstructor):

    yaml_tag = u'!order'

    def __init__(self, platform, order_id, order_date,
            customer_id = None,
            items = None,
            discounts = None,
            ):
        assert type(platform) is unicode
        self.platform = platform
        if type(order_id) in [int]:
            order_id = unicode(order_id)
        assert type(order_id) is unicode
        self.order_id = order_id
        assert type(order_date) in [datetime.date, datetime.datetime]
        if type(order_date) is datetime.datetime and order_date.tzinfo:
            order_date = order_date.astimezone(pytz.utc)
        self.order_date = order_date
        if customer_id is not None:
            assert type(customer_id) is unicode
            self.customer_id = customer_id
        if items is None:
            self.items = []
        else:
            assert type(items) is list
            assert all([isinstance(i, Item) for i in items])
            self.items = items
        if discounts is None:
            self.discounts = []
        else:
            assert type(discounts) is list
            assert all([isinstance(d, Discount) for d in discounts])
            self.discounts = discounts

class Item(_YamlInitConstructor):

    yaml_tag = u'!item'

    def __init__(
            self,
            name = None,
            price_brutto = None,
            ):
        if not name is None:
            assert type(name) is unicode
            self.name = name
        assert type(price_brutto) is Sum
        self.price_brutto = price_brutto

class Campaign(_YamlInitConstructor):

    yaml_tag = u'!campaign'

    def __init__(self,
            end = None,
            founder = None,
            name = None,
            website_url = None,
            ):
        assert type(name) is unicode
        self.name = name
        assert type(founder) is unicode
        self.founder = founder
        if not end is None:
            assert type(end) is datetime.datetime
            assert not end.tzinfo is None, '%r' % end
            self.end = end
        if not website_url is None:
            assert type(website_url) is unicode
            self.website_url = website_url

class Pledge(Item):

    yaml_tag = u'!pledge'

    def __init__(self,
            campaign = None,
            reward = None,
            **kwargs
            ):
        super(Pledge, self).__init__(**kwargs)
        assert type(campaign) is Campaign
        self.campaign = campaign
        if not reward is None:
            assert type(reward) is unicode
            self.reward = reward

class Contribution(Item):

    yaml_tag = u'!contribution'

    def __init__(self,
            campaign = None,
            reward = None,
            **kwargs
            ):
        super(Contribution, self).__init__(**kwargs)
        assert type(campaign) is Campaign
        self.campaign = campaign
        if not reward is None:
            assert type(reward) is unicode
            self.reward = reward

class Article(Item):

    yaml_tag = u'!article'

    def __init__(
            self,
            authors = None,
            color = None,
            delivery_date = None,
            depth = None,
            features = None,
            height  = None,
            maximum_load = None,
            option = None,
            product_id = None,
            quantity = None,
            reseller = None,
            shipper = None,
            size = None,
            state = None,
            width = None,
            **kwargs
            ):
        super(Article, self).__init__(**kwargs)
        assert not self.name is None
        assert type(quantity) is int
        self.quantity = quantity
        if authors is not None:
            assert type(authors) is list
            self.authors = authors
        if state is not None:
            assert type(state) is unicode
            self.state = state
        if reseller is not None:
            assert type(reseller) is unicode
            self.reseller = reseller
        if shipper is not None:
            assert type(shipper) is unicode
            self.shipper = shipper
        if product_id is not None:
            if type(product_id) in [int]:
                product_id = unicode(product_id)
            assert type(product_id) is unicode
            self.product_id = product_id
        if option is not None:
            assert type(option) is unicode
            self.option = option
        if color is not None:
            assert type(color) is unicode
            self.color = color
        if size is not None:
            assert type(size) is unicode
            self.size = size
        if width is not None:
            assert type(width) is ScalarFigure
            self.width = width
        if depth is not None:
            assert type(depth) is ScalarFigure
            self.depth = depth
        if height is not None:
            assert type(height) is ScalarFigure
            self.height = height
        if maximum_load is not None:
            assert type(maximum_load) is ScalarFigure
            self.maximum_load = maximum_load
        if features is not None:
            assert type(features) is unicode
            self.features = features
        assert delivery_date is None or type(delivery_date) is datetime.date
        self.delivery_date = delivery_date

class Service(Item):

    yaml_tag = u'!service'

    def __init__(
            self,
            duration = None,
            **kwargs
            ):
        super(Service, self).__init__(**kwargs)
        if duration is not None:
            assert type(duration) is ioex.datetimeex.Duration
            self.duration = duration

class Transportation(Item):

    yaml_tag = u'!transportation'

    def __init__(
            self,
            departure_point = None,
            destination_point = None,
            distance = None,
            estimated_arrival_time = None,
            passenger = None,
            route_map = None,
            ticket_url = None,
            valid_from = None,
            valid_until = None,
            **kwargs
            ):
        super(Transportation, self).__init__(**kwargs)
        if departure_point is not None:
            assert type(departure_point) is unicode
            self.departure_point = departure_point
        if destination_point is not None:
            assert type(destination_point) is unicode
            self.destination_point = destination_point
        if distance is not None:
            assert type(distance) is Distance
            self.distance = distance
        if route_map is not None:
            assert type(route_map) is str
            self.route_map = route_map
        if passenger is not None:
            assert type(passenger) is Person
            self.passenger = passenger
        if valid_from is not None:
            assert type(valid_from) is datetime.datetime
            assert not valid_from.tzinfo is None
            self.valid_from = valid_from
        if valid_until is not None:
            assert type(valid_until) is datetime.datetime
            assert not valid_until.tzinfo is None
            self.valid_until = valid_until
        if ticket_url is not None:
            assert type(ticket_url) is unicode
            self.ticket_url = ticket_url
        if estimated_arrival_time is not None:
            assert type(estimated_arrival_time) is ioex.datetimeex.Period
            assert not estimated_arrival_time.start.tzinfo is None
            assert not estimated_arrival_time.end.tzinfo is None
            self.estimated_arrival_time = estimated_arrival_time

class Shipping(Transportation):

    yaml_tag = u'!shipping'

    def __init__(
            self,
            **kwargs
            ):
        super(Shipping, self).__init__(**kwargs)

class TaxiRide(Transportation):

    yaml_tag = u'!taxi-ride'

    def __init__(
            self,
            arrival_time = None,
            departure_time = None,
            driver = None,
            name = None,
            **kwargs
            ):
        if name is None:
            name = u'Taxi Ride'
        super(TaxiRide, self).__init__(name = name, **kwargs)
        assert type(driver) is unicode
        self.driver = driver
        assert arrival_time is None or type(arrival_time) is datetime.datetime
        self.arrival_time = arrival_time
        assert departure_time is None or type(departure_time) is datetime.datetime
        self.departure_time = departure_time

class OrderRegistry(_Object, yaml.YAMLObject):

    yaml_tag = u'!order-registry'

    def __init__(self):
        self.registry = {}

    def register(self, order):
        assert isinstance(order, Order)
        if not order.platform in self.registry:
            self.registry[order.platform] = {}
        self.registry[order.platform][order.order_id] = order

    @classmethod
    def to_yaml(cls, dumper, self):
        return dumper.represent_mapping(cls.yaml_tag, self.registry)

    @classmethod
    def from_yaml(cls, loader, node):
        self = cls()
        self.registry = loader.construct_mapping(node)
        return self

class Person(_YamlInitConstructor):

    yaml_tag = u'!person'

    def __init__(self, first_name = None, last_name = None):
        self.first_name = first_name
        self.last_name = last_name

    @property
    def first_name(self):
        return self._first_name

    @first_name.setter
    def first_name(self, first_name):
        assert first_name is None or type(first_name) is unicode
        self._first_name = first_name

    @property
    def last_name(self):
        return self._last_name

    @last_name.setter
    def last_name(self, last_name):
        assert last_name is None or type(last_name) is unicode
        self._last_name = last_name

    @classmethod
    def to_yaml(cls, dumper, person):
        return dumper.represent_mapping(cls.yaml_tag, {
            'first_name': person.first_name,
            'last_name': person.last_name,
            })

    def __repr__(self):
        return self.__class__.__name__ + '(%s)' % ', '.join([
            '%s=%r' % (k, v) for k, v in vars(self).items()
            ])