from django.db import models
import settings
import finance_core
from finance_core.models import BudgetArea, BudgetTerm

import datetime

APPROVAL_STATE_PENDING = 0
APPROVAL_STATE_APPROVED = 1
APPROVAL_STATE_REJECTED = -1
APPROVAL_STATES = (
    (APPROVAL_STATE_PENDING,  'Pending'),
    (APPROVAL_STATE_APPROVED, 'Approved'),
    (APPROVAL_STATE_REJECTED, 'Rejected'),
)

class ReimbursementRequest(models.Model):
    submitter = models.CharField(max_length=10) # MIT username of submitter
    check_to_first_name = models.CharField(max_length=50, verbose_name="check recipient's first name")
    check_to_last_name = models.CharField(max_length=50, verbose_name="check recipient's last name")
    check_to_email = models.EmailField(verbose_name="email address for check pickup")
    check_to_addr = models.TextField(blank=True, verbose_name="address for check mailing", help_text="For most requests, this should be blank for pickup in SAO (W20-549)")
    amount = models.DecimalField(max_digits=7, decimal_places=2, help_text='Do not include "$"')
    budget_area = models.ForeignKey(BudgetArea, related_name='as_budget_area')
    budget_term = models.ForeignKey(BudgetTerm)
    expense_area = models.ForeignKey(BudgetArea, related_name='as_expense_area') # ~GL
    request_time = models.DateTimeField(default=datetime.datetime.now)
    approval_time = models.DateTimeField(blank=True, null=True,)
    approval_status = models.IntegerField(default=0, choices=APPROVAL_STATES)
    printing_time = models.DateTimeField(blank=True, null=True,)
    name = models.CharField(max_length=50, verbose_name='short description', )
    description = models.TextField(blank=True, verbose_name='long description', )

    class Meta:
        permissions = (
            ('can_list', 'Can list requests',),
            ('can_approve', 'Can approve requests',),
        )

    def __unicode__(self, ):
        return "%s: %s %s (%s) (by %s) for $%s" % (
            self.name,
            self.check_to_first_name,
            self.check_to_last_name,
            self.check_to_email,
            self.submitter,
            self.amount,
        )

    def convert(self, signatory, signatory_email=settings.SIGNATORY_EMAIL):
        voucher = Voucher()
        voucher.group_name = settings.GROUP_NAME
        voucher.account = self.budget_area.get_account_number()
        voucher.signatory = signatory
        voucher.signatory_email = signatory_email
        voucher.first_name = self.check_to_first_name
        voucher.last_name = self.check_to_last_name
        voucher.email_address = self.check_to_email
        voucher.mailing_address = self.check_to_addr
        voucher.amount = self.amount
        voucher.description = self.name
        voucher.gl = self.expense_area.get_account_number()
        voucher.save()
        finance_core.models.make_transfer(
            self.name,
            self.amount,
            finance_core.models.LAYER_EXPENDITURE,
            self.budget_term,
            self.budget_area,
            self.expense_area,
            self.description,
        )
        self.approval_status = 1
        self.approval_time = datetime.datetime.now()
        self.save()

class Voucher(models.Model):
    group_name = models.CharField(max_length=10)
    account = models.IntegerField()
    signatory = models.CharField(max_length=50)
    signatory_email = models.EmailField()
    first_name = models.CharField(max_length=20)
    last_name = models.CharField(max_length=20)
    email_address = models.EmailField(max_length=50)
    mailing_address = models.TextField()
    amount = models.DecimalField(max_digits=7, decimal_places=2,)
    description = models.TextField()
    gl = models.IntegerField()