from django.db import models
from django.utils.translation import get_language, gettext_lazy as _


class NotificationTemplate(models.Model):
    TEMPLATE_CHOICES = [
        ('onboarding_it', _('Onboarding: IT')),
        ('onboarding_general_info', _('Onboarding: Allgemeine Info')),
        ('onboarding_business_card', _('Onboarding: Visitenkarte')),
        ('onboarding_hr_works', _('Onboarding: HR Works')),
        ('onboarding_key', _('Onboarding: Schlüssel')),
        ('onboarding_reference', _('Onboarding: Referenz Anfordernde Person')),
        ('onboarding_welcome', _('Onboarding: Welcome E-Mail')),
        ('offboarding_it', _('Offboarding: IT')),
        ('offboarding_general_info', _('Offboarding: Allgemeine Info')),
        ('offboarding_hr_works_disable', _('Offboarding: HR Works Deaktivierung')),
        ('offboarding_reference', _('Offboarding: Referenz Anfordernde Person')),
    ]

    key = models.CharField(max_length=60, choices=TEMPLATE_CHOICES, unique=True)
    subject_template = models.CharField(max_length=255)
    subject_template_en = models.CharField(max_length=255, blank=True)
    body_template = models.TextField()
    body_template_en = models.TextField(blank=True)
    is_active = models.BooleanField(default=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        ordering = ['key']

    def __str__(self) -> str:
        return self.get_key_display()

    def translated_subject_template(self, language_code: str | None = None) -> str:
        lang = (language_code or get_language() or 'de').split('-')[0]
        if lang == 'en' and self.subject_template_en.strip():
            return self.subject_template_en.strip()
        return self.subject_template.strip()

    def translated_body_template(self, language_code: str | None = None) -> str:
        lang = (language_code or get_language() or 'de').split('-')[0]
        if lang == 'en' and self.body_template_en.strip():
            return self.body_template_en.strip()
        return self.body_template.strip()


class NotificationRule(models.Model):
    EVENT_CHOICES = [('onboarding', _('Onboarding')), ('offboarding', _('Offboarding'))]
    OPERATOR_CHOICES = [
        ('always', _('Immer')),
        ('contains', _('Enthält')),
        ('equals', _('Ist gleich')),
        ('is_true', _('Ist aktiv/Ja')),
        ('is_false', _('Ist inaktiv/Nein')),
    ]

    name = models.CharField(max_length=120)
    is_active = models.BooleanField(default=True)
    event_type = models.CharField(max_length=20, choices=EVENT_CHOICES)
    field_name = models.CharField(max_length=80, blank=True)
    operator = models.CharField(max_length=20, choices=OPERATOR_CHOICES, default='always')
    expected_value = models.CharField(max_length=255, blank=True)
    recipients = models.TextField(help_text='Mehrere E-Mail-Adressen mit Komma, Semikolon oder Zeilenumbruch trennen.')
    template_key = models.CharField(max_length=60, blank=True)
    custom_subject = models.CharField(max_length=255, blank=True)
    custom_subject_en = models.CharField(max_length=255, blank=True)
    custom_body = models.TextField(blank=True)
    custom_body_en = models.TextField(blank=True)
    include_pdf_attachment = models.BooleanField(default=False)
    sort_order = models.PositiveIntegerField(default=0)

    class Meta:
        ordering = ['event_type', 'sort_order', 'id']

    def __str__(self) -> str:
        state = 'aktiv' if self.is_active else 'inaktiv'
        return f'{self.get_event_type_display()} | {self.name} ({state})'

    def translated_custom_subject(self, language_code: str | None = None) -> str:
        lang = (language_code or get_language() or 'de').split('-')[0]
        if lang == 'en' and self.custom_subject_en.strip():
            return self.custom_subject_en.strip()
        return self.custom_subject.strip()

    def translated_custom_body(self, language_code: str | None = None) -> str:
        lang = (language_code or get_language() or 'de').split('-')[0]
        if lang == 'en' and self.custom_body_en.strip():
            return self.custom_body_en.strip()
        return self.custom_body.strip()