import logging

from django.contrib.auth.models import User
from django.db import models
from django.urls import reverse
from django.utils import timezone
from django.db.models.signals import post_save, post_delete
from django.dispatch import receiver
from django.core.cache import cache
from .utils.email_notifications import send_callback_notification

logger = logging.getLogger(__name__)


class Recall(models.Model):
    title = models.CharField(max_length=255, verbose_name='Организация')
    content = models.TextField(blank=True, verbose_name='Отзыв')
    scan = models.ImageField(upload_to="scan/%Y/%m/%d/", blank=True, null=True, verbose_name='Фото')
    time_create = models.DateTimeField(auto_now_add=True, verbose_name='Дата создания')
    time_update = models.DateTimeField(auto_now=True, verbose_name='Дата изменения')
    is_published = models.BooleanField(default=True, verbose_name='Опубликован')

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('recall_detail', kwargs={'pk': self.pk})

    class Meta:
        verbose_name = 'Отзыв'
        verbose_name_plural = 'Отзывы'
        ordering = ['time_create', 'title']

    def get_seo_title(self):
        return f"Отзыв от {self.title} | Программист 1С"

    def get_seo_description(self):
        if self.content:
            clean_content = self.content[:160].replace('\n', ' ').strip()
            return f"Отзыв о работе программиста 1С от {self.title}. {clean_content}..."
        return f"Отзыв клиента {self.title} о работе программиста 1С Николая Сердюк"


class Competence(models.Model):
    title = models.CharField(max_length=255, verbose_name='Программист')
    content = models.TextField(blank=True, verbose_name='Компетенция')
    photo = models.ImageField(upload_to="photos/%Y/%m/%d/", blank=True, null=True, verbose_name='Фото')
    time_create = models.DateTimeField(auto_now_add=True, verbose_name='Дата создания')
    time_update = models.DateTimeField(auto_now=True, verbose_name='Дата изменения')
    is_published = models.BooleanField(default=True, verbose_name='Опубликован')

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('competence_detail', kwargs={'pk': self.pk})

    class Meta:
        verbose_name = 'Компетенция'
        verbose_name_plural = 'Компетенции'
        ordering = ['time_create', 'title']


class Solution(models.Model):
    title = models.CharField(max_length=255, verbose_name='Наименование')
    description = models.TextField(blank=True, verbose_name='Описание')
    implementation = models.TextField(blank=True, verbose_name='Реализация')
    closing = models.TextField(blank=True, verbose_name='Заключение')
    time_create = models.DateTimeField(auto_now_add=True, verbose_name='Дата создания')
    time_update = models.DateTimeField(auto_now=True, verbose_name='Дата изменения')
    is_published = models.BooleanField(default=True, verbose_name='Опубликован')
    slug = models.SlugField(
        max_length=255,
        unique=False,          # временно не уникальное
        db_index=True,
        verbose_name='URL-идентификатор',
        blank=True,
        null=True,             # разрешаем NULL
    )
    def __str__(self):
        return self.title
    
    def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = slugify(self.title)
        super().save(*args, **kwargs)
        
    def get_absolute_url(self):
        return reverse('solution_detail', kwargs={'slug': self.slug})

    class Meta:
        verbose_name = 'Проекты'
        verbose_name_plural = 'Проекты'
        ordering = ['time_create', 'title']

    def get_seo_title(self):
        return f"Проект: {self.title} | Автоматизация 1С"

    def get_seo_description(self):
        # Используем closing если есть, иначе description
        source = self.closing or self.description
        if source:
            clean = source[:160].replace('\n', ' ').strip()
            return f"Проект автоматизации: {self.title}. {clean}..."
        return f"Реализация проекта {self.title} - программист 1С Николай Сердюк"

    def get_meta_keywords(self):
        base_keywords = ["проект 1С", "автоматизация 1С", "внедрение 1С"]
        title_words = self.title.lower().split()
        return base_keywords + title_words


class Home(models.Model):
    title = models.CharField(max_length=255, verbose_name='Наименование')
    content = models.TextField(blank=True, verbose_name='Статья')
    home_image = models.ImageField(upload_to="home_image/%Y/%m/%d/", blank=True, null=True, verbose_name='Фото')
    time_create = models.DateTimeField(auto_now_add=True, verbose_name='Дата создания')
    time_update = models.DateTimeField(auto_now=True, verbose_name='Дата изменения')
    is_published = models.BooleanField(default=True, verbose_name='Опубликован')

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('home')

    class Meta:
        verbose_name = 'Главная страница'
        verbose_name_plural = 'Главная страница'
        ordering = ['time_create', 'title']


class CallbackRequest(models.Model):
    name = models.CharField(max_length=100, verbose_name='Имя')
    phone = models.CharField(max_length=20, verbose_name='Телефон')
    email = models.EmailField(blank=True, null=True, verbose_name='Электронная почта')
    question = models.TextField(blank=True, verbose_name='Ваш вопрос')
    time_create = models.DateTimeField(auto_now_add=True, verbose_name='Дата создания')
    is_processed = models.BooleanField(default=False, verbose_name='Обработано')
    is_read = models.BooleanField(default=False, verbose_name='Прочитано')
    notification_sent = models.BooleanField(default=False, verbose_name='Уведомление отправлено')

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

    class Meta:
        verbose_name = 'Заявка на звонок'
        verbose_name_plural = 'Заявки на звонок'
        ordering = ['-time_create']


@receiver(post_save, sender=CallbackRequest)
def send_callback_email_notification(sender, instance, created, **kwargs):
    if created and not instance.notification_sent:
        try:
            success = send_callback_notification(instance)
            if success:
                sender.objects.filter(pk=instance.pk).update(notification_sent=True)
        except Exception:
            # Логируем ошибку, но не прерываем сохранение объекта
            logger.exception(
                'Не удалось отправить email-уведомление для заявки pk=%s', instance.pk
            )


class PageView(models.Model):
    url = models.CharField(max_length=500)
    timestamp = models.DateTimeField(default=timezone.now)
    ip_address = models.GenericIPAddressField()
    user_agent = models.TextField(blank=True)
    referer = models.CharField(max_length=500, blank=True)

    class Meta:
        indexes = [
            models.Index(fields=['url', 'timestamp']),
            models.Index(fields=['timestamp']),
        ]


class Visitor(models.Model):
    ip_address = models.GenericIPAddressField()
    first_visit = models.DateTimeField(default=timezone.now)
    last_visit = models.DateTimeField(default=timezone.now)
    visit_count = models.IntegerField(default=1)

    class Meta:
        indexes = [
            models.Index(fields=['ip_address']),
        ]


class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE, verbose_name='Пользователь')
    phone = models.CharField(max_length=20, blank=True, verbose_name='Телефон')
    company = models.CharField(max_length=255, blank=True, verbose_name='Компания')
    specialization = models.CharField(max_length=100, blank=True, verbose_name='Специализация')
    avatar = models.ImageField(upload_to='avatars/%Y/%m/%d/', blank=True, verbose_name='Аватар')
    email_notifications = models.BooleanField(default=True, verbose_name='Получать уведомления')

    def __str__(self):
        return f'Профиль {self.user.username}'

    class Meta:
        verbose_name = 'Профиль'
        verbose_name_plural = 'Профили'


@receiver(post_save, sender=User)
def create_or_save_user_profile(sender, instance, created, **kwargs):
    if created:
        Profile.objects.get_or_create(user=instance)


@receiver([post_save, post_delete], sender=Home)
@receiver([post_save, post_delete], sender=Solution)
@receiver([post_save, post_delete], sender=Competence)
@receiver([post_save, post_delete], sender=Recall)
def clear_sitemap_cache(sender, **kwargs):
    cache.delete('sitemap_cache')