"""
Search Analytics Models für Performance Tracking
"""

from django.db import models
from django.contrib.auth.models import User
from django.utils import timezone


class SearchAnalytics(models.Model):
    """Search Analytics für Performance Tracking"""
    
    query = models.CharField(max_length=255)
    user = models.ForeignKey(User, on_delete=models.SET_NULL, null=True, blank=True)
    result_count = models.IntegerField(default=0)
    ip_address = models.GenericIPAddressField(null=True, blank=True)
    user_agent = models.TextField(blank=True)
    created_at = models.DateTimeField(auto_now_add=True)
    
    class Meta:
        ordering = ['-created_at']
        verbose_name = 'Search Analytics'
        verbose_name_plural = 'Search Analytics'
    
    def __str__(self):
        return f"{self.query} - {self.result_count} results"


class SearchSuggestion(models.Model):
    """Search Suggestions für Auto-Complete"""
    
    SUGGESTION_TYPE_CHOICES = [
        ('product', 'Produkt'),
        ('auction', 'Auktion'),
        ('category', 'Kategorie'),
        ('tag', 'Tag'),
    ]
    
    query = models.CharField(max_length=255)
    suggestion_type = models.CharField(max_length=20, choices=SUGGESTION_TYPE_CHOICES)
    suggestion_text = models.CharField(max_length=255)
    url = models.URLField(blank=True)
    use_count = models.IntegerField(default=0)
    is_active = models.BooleanField(default=True)
    created_at = models.DateTimeField(auto_now_add=True)
    
    class Meta:
        ordering = ['-use_count', 'suggestion_text']
        verbose_name = 'Search Suggestion'
        verbose_name_plural = 'Search Suggestions'
        unique_together = ['query', 'suggestion_text']
    
    def __str__(self):
        return f"{self.query} -> {self.suggestion_text}"
    
    def increment_use_count(self):
        """Verwendungszähler erhöhen"""
        self.use_count += 1
        self.save(update_fields=['use_count'])


class SearchSynonym(models.Model):
    """Search Synonyms für bessere Suchergebnisse"""
    
    primary_term = models.CharField(max_length=100)
    synonym_terms = models.TextField(help_text="Komma-getrennte Synonyme")
    language = models.CharField(max_length=10, default='de')
    is_active = models.BooleanField(default=True)
    created_at = models.DateTimeField(auto_now_add=True)
    
    class Meta:
        ordering = ['primary_term']
        verbose_name = 'Search Synonym'
        verbose_name_plural = 'Search Synonyms'
        unique_together = ['primary_term', 'language']
    
    def __str__(self):
        return f"{self.primary_term} ({self.language})"
    
    def get_synonyms_list(self):
        """Synonyme als Liste zurückgeben"""
        return [term.strip() for term in self.synonym_terms.split(',') if term.strip()]


class SearchTrend(models.Model):
    """Search Trends für Analytics"""
    
    date = models.DateField()
    total_searches = models.IntegerField(default=0)
    unique_users = models.IntegerField(default=0)
    avg_results = models.FloatField(default=0)
    popular_queries = models.JSONField(default=list)
    search_success_rate = models.FloatField(default=0)  # % der Suchen mit Ergebnissen
    
    class Meta:
        unique_together = ['date']
        verbose_name = 'Search Trend'
        verbose_name_plural = 'Search Trends'
    
    def __str__(self):
        return f"Search Trends - {self.date}"
    
    @classmethod
    def get_or_create_today(cls):
        """Heutige Trends erstellen oder abrufen"""
        today = timezone.now().date()
        trend, created = cls.objects.get_or_create(date=today)
        return trend
    
    def update_trends(self):
        """Trends basierend auf Analytics aktualisieren"""
        from django.db.models import Count, Avg
        
        # Get today's analytics
        today_analytics = SearchAnalytics.objects.filter(
            created_at__date=self.date
        )
        
        self.total_searches = today_analytics.count()
        self.unique_users = today_analytics.values('user').distinct().count()
        
        if self.total_searches > 0:
            self.avg_results = today_analytics.aggregate(
                avg=Avg('result_count')
            )['avg'] or 0
            
            # Popular queries
            popular = today_analytics.values('query').annotate(
                count=Count('id')
            ).order_by('-count')[:10]
            
            self.popular_queries = [
                {'query': item['query'], 'count': item['count']}
                for item in popular
            ]
            
            # Success rate (searches with results)
            successful_searches = today_analytics.filter(result_count__gt=0).count()
            self.search_success_rate = (successful_searches / self.total_searches) * 100
        
        self.save()


class SearchIndex(models.Model):
    """Search Index Status Tracking"""
    
    INDEX_STATUS_CHOICES = [
        ('building', 'Wird erstellt'),
        ('updating', 'Wird aktualisiert'),
        ('ready', 'Bereit'),
        ('error', 'Fehler'),
    ]
    
    index_name = models.CharField(max_length=100, unique=True)
    status = models.CharField(max_length=20, choices=INDEX_STATUS_CHOICES, default='ready')
    last_build = models.DateTimeField(null=True, blank=True)
    document_count = models.IntegerField(default=0)
    index_size = models.BigIntegerField(default=0)  # in bytes
    error_message = models.TextField(blank=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    
    class Meta:
        ordering = ['index_name']
        verbose_name = 'Search Index'
        verbose_name_plural = 'Search Indexes'
    
    def __str__(self):
        return f"{self.index_name} - {self.get_status_display()}"
    
    @classmethod
    def get_or_create_index(cls, name):
        """Index erstellen oder abrufen"""
        index, created = cls.objects.get_or_create(index_name=name)
        return index
    
    def mark_building(self):
        """Index als im Aufbau markieren"""
        self.status = 'building'
        self.save(update_fields=['status'])
    
    def mark_ready(self, document_count=0, index_size=0):
        """Index als bereit markieren"""
        self.status = 'ready'
        self.last_build = timezone.now()
        self.document_count = document_count
        self.index_size = index_size
        self.error_message = ''
        self.save()
    
    def mark_error(self, error_message):
        """Index als fehlerhaft markieren"""
        self.status = 'error'
        self.error_message = error_message
        self.save(update_fields=['status', 'error_message'])