from django.db import models
from django.core.exceptions import ValidationError

from common.fields import UpperCaseCharField


# Create your models here.
class NomenclatureBaseModel(models.Model):
    name = UpperCaseCharField(max_length=100)
    short_name = UpperCaseCharField(max_length=5, null=True, blank=True)
    description = models.TextField(blank=True, null=True)
    active = models.BooleanField(default=True)

    class Meta:
        abstract = True
        ordering = ['name']

    def __str__(self):
        return self.name

    def clean(self):
        if not self.name:
            raise ValidationError('Name cannot be empty.')
        if self.short_name and len(self.short_name) > 5:
            raise ValidationError('Short name cannot exceed 5 characters.')
        if self.description and len(self.description) > 255:
            raise ValidationError('Description cannot exceed 255 characters.')


class CompanyModel(NomenclatureBaseModel):
    def clean(self):
        super().clean()
        if CompanyModel.objects.filter(name=self.name, active=True).exclude(id=self.id).exists():
            raise ValidationError(f'Company with name {self.name} already exists and is active.')
        if CompanyModel.objects.filter(short_name=self.short_name, active=True).exclude(id=self.id).exists():
            raise ValidationError(f'Company with short name {self.short_name} already exists and is active.')


class LinesModel(NomenclatureBaseModel):
    company = models.ForeignKey(
        'common.CompanyModel',
        on_delete=models.CASCADE,
        related_name='line_company'
    )

    def clean(self):
        super().clean()
        if LinesModel.objects.filter(name=self.name, active=True).exclude(id=self.id).exists():
            raise ValidationError(f'Line with name {self.name} already exists and is active.')
        if LinesModel.objects.filter(short_name=self.short_name, active=True).exclude(id=self.id).exists():
            raise ValidationError(f'Line with short name {self.short_name} already exists and is active.')


class OperationModel(NomenclatureBaseModel):
    ...

class ContainerKindModel(NomenclatureBaseModel):
    ...

class ContainerTypeModel(models.Model):
    name = models.CharField(max_length=6, unique=True)
    length = models.IntegerField()
    height = models.BooleanField()
    container_type = models.ForeignKey(
        'common.ContainerKindModel',
        on_delete=models.CASCADE,
        related_name='container_type_container_kinds'
    )
    deleted = models.BooleanField(default=False)

    class Meta:
        app_label = 'common'

    def __str__(self):
        return self.name