from django.db import models

class Person(models.Model):
    rfid = models.CharField(max_length=256)
    name = models.CharField(max_length=140, unique=True)
    created = models.DateTimeField(auto_now_add=True)
    def __str__(self):

        return f"Person {self.name}"

class Thing(models.Model):
    rfid = models.CharField(max_length=256, unique=True)
    name = models.CharField(max_length=140)
    owner = models.ForeignKey(to=Person,
            on_delete=models.PROTECT, related_name='owner',
            null=True, blank=True)
    description = models.TextField(max_length=9999, blank=True)
    created = models.DateTimeField(auto_now_add=True)
    lent = models.BooleanField(default=False)
    image = models.ImageField()

    def __str__(self):
        return f"Thing {self.name}"

class Lending(models.Model):
    purpose = models.CharField(max_length=1000, unique=True)
    begin = models.DateTimeField(auto_now=True)
    deadline = models.DateTimeField()
    returned = models.DateTimeField(null=True, blank=True) # if returned is empty -> leding finished
    lender = models.ForeignKey(to=Person,
            on_delete=models.SET_NULL,related_name='borrows',null=True)
    thing  = models.ForeignKey(to=Thing, on_delete=models.CASCADE,
            related_name='ilendings')
    def __str__(self):
        return f"Lending from {self.begin}, purpose: {self.purpose}, deadline: {self.deadline}"