##
## interfaces.py
from zope.interface import Attribute, invariant, Invalid
from zope import schema
from waeup.sirp.interfaces import IWAeUPObject
from waeup.sirp.hostels.vocabularies import (
    bed_letters, blocks, special_handling, StudentSource)

class IHostelsContainer(IWAeUPObject):
    """A container for all kind of hostel objects.

    """

class IHostel(IWAeUPObject):
    """A base representation of hostels.

    """

    def loggerInfo(ob_class, comment):
        """Adds an INFO message to the log file
        """

    def updateBeds():
        """Fill hostel with beds or update beds.
        """

    hostel_id = schema.TextLine(
        title = u'Hostel Id',
        readonly = True,
        )

    sort_id = schema.Int(
        title = u'Sort Id',
        required = True,
        default = 10,
        )

    hostel_name = schema.TextLine(
        title = u'Hall Name',
        required = True,
        default = u'Hall 1',
        )

    floors_per_block = schema.Int(
        title = u'Floors per Block',
        required = True,
        default = 1,
        )

    rooms_per_floor = schema.Int(
        title = u'Rooms per Floor',
        required = True,
        default = 2,
        )

    beds_reserved = schema.List(
        title = u'Reserved Beds',
        value_type = schema.TextLine(
            default = u'',
            required = False,
        ),
        required = True,
        readonly = False,
        default = [],
        )

    blocks_for_female = schema.List(
        title = u'Blocks for Female Students',
        value_type = schema.Choice(
            vocabulary = blocks
            ),
        )

    blocks_for_male = schema.List(
        title = u'Blocks for Male Students',
        value_type = schema.Choice(
            vocabulary = blocks
            ),
        )

    beds_for_fresh = schema.List(
        title = u'Beds for Fresh Students',
        value_type = schema.Choice(
            vocabulary = bed_letters
            ),
        )

    beds_for_returning = schema.List(
        title = u'Beds for Returning Students',
        value_type = schema.Choice(
            vocabulary = bed_letters
            ),
        )

    beds_for_final = schema.List(
        title = u'Beds for Final Year Students',
        value_type = schema.Choice(
            vocabulary = bed_letters
            ),
        )

    beds_for_all = schema.List(
        title = u'Beds without category',
        value_type = schema.Choice(
            vocabulary = bed_letters
            ),
        )

    special_handling = schema.Choice(
        title = u'Special Handling',
        vocabulary = special_handling,
        required = True,
        default = u'regular',
        )

    @invariant
    def blocksOverlap(hostel):
        bfe = hostel.blocks_for_female
        bma = hostel.blocks_for_male
        if set(bfe).intersection(set(bma)):
            raise Invalid('Female and male blocks overlap.')

    @invariant
    def bedsOverlap(hostel):
        beds = (hostel.beds_for_fresh +
                hostel.beds_for_returning +
                hostel.beds_for_final +
                hostel.beds_for_all)
        if len(beds) != len(set(beds)):
            raise Invalid('Bed categories overlap.')

class IBed(IWAeUPObject):
    """A base representation of beds.

    """

    def loggerInfo(ob_class, comment):
        """Adds an INFO message to the log file
        """

    def getBedCoordinates():
        """Determine the coordinates from bed_id.
        """
    def bookBed(student_id):
        """Book a bed for a student.
        """

    def switchReservation():
        """Reserves bed or relases reserved bed respectively.
        """

    bed_id = schema.TextLine(
        title = u'Bed Id',
        required = True,
        default = u'',
        )

    bed_type = schema.TextLine(
        title = u'Bed Type',
        required = True,
        default = u'',
        )

    bed_number = schema.Int(
        title = u'Bed Number',
        required = True,
        )

    owner = schema.TextLine(
        title = u'Owner (Student)',
        required = True,
        default = u'',
        )



class IBedAllocateStudent(IBed):
    """A representation of beds for allocation form only.

    """

    owner = schema.Choice(
        title = u'Owner (Student)',
        source = StudentSource(),
        default = None,
        required = True,
        )