from django.db import models
from django.contrib.auth.models import AbstractUser
from django.contrib.auth.models import Group as BuiltinGroup
from .util import get_week_range
import base64


class User(AbstractUser):
    groups = models.ManyToManyField(
        "auth.Group",
        related_name="user_groups",
        blank=True,
    )
    user_permissions = models.ManyToManyField(
        "auth.Permission",
        related_name="user_permissions",
        blank=True,
    )


class Group(BuiltinGroup):
    class Meta:
        proxy = True


class ReportKind(models.TextChoices):
    WEEKLY = "weekly"
    DAILY = "daily"


class Berichtsheft(models.Model):
    id = models.AutoField(primary_key=True)
    user = models.TextField()
    kind = models.CharField(
        max_length=20, choices=ReportKind.choices, default=ReportKind.WEEKLY
    )
    num = models.PositiveBigIntegerField(default=0)
    year = models.PositiveIntegerField()
    week = models.PositiveSmallIntegerField()
    department = models.CharField(max_length=160, default="")
    content = models.JSONField()
    needs_rewrite = models.BooleanField(default=False)
    created = models.DateTimeField(auto_now_add=True)
    image = models.BinaryField(null=True, blank=True)

    def __str__(self):
        return f"Berichtsheft: {self.user}, Year: {self.year}, Week: {self.week}"

    @property
    def is_approved(self):
        approvals = Approval.objects.filter(report=self.id)
        return len(approvals) >= 2

    def vars(self):
        start_date, end_date = get_week_range(self.year, self.week)

        vars = {
            "user": self.user,
            "kind": self.kind,
            "num": self.num,
            "year": self.year,
            "week": self.week,
            "department": self.department,
            "start_date": start_date,
            "end_date": end_date,
            "image": base64.b64encode(self.image).decode("utf-8")
            if self.image is not None
            else None,
        }

        for key, val in self.content.items():
            vars[key] = val

        return vars


class Approval(models.Model):
    id = models.AutoField(primary_key=True)
    user = models.TextField()
    report = models.ForeignKey(
        Berichtsheft, on_delete=models.CASCADE, related_name="report"
    )


class BerichtsheftDraft(models.Model):
    user = models.TextField(primary_key=True)
    department = models.CharField(max_length=160, default="")
    content = models.JSONField()