from django.db import models
from django.contrib.auth import get_user_model
from django.utils import timezone
from django.core.exceptions import ValidationError

User = get_user_model()


class SteamAPIKey(models.Model):
    """Model to store Steam API key configuration - Admin only"""
    
    name = models.CharField(
        max_length=100, 
        unique=True,
        help_text="Descriptive name for this API key (e.g., 'Production Key', 'Development Key')"
    )
    api_key = models.CharField(
        max_length=64,
        help_text="Steam Web API key from https://steamcommunity.com/dev/apikey"
    )
    is_active = models.BooleanField(
        default=True,
        help_text="Whether this API key should be used"
    )
    description = models.TextField(
        blank=True,
        help_text="Optional description or notes about this API key"
    )
    
    # Metadata
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    last_used = models.DateTimeField(
        null=True, 
        blank=True,
        help_text="When this API key was last used"
    )
    
    class Meta:
        verbose_name = "Steam API Key"
        verbose_name_plural = "Steam API Keys"
        ordering = ['-is_active', 'name']
    
    def __str__(self):
        status = "Active" if self.is_active else "Inactive"
        return f"{self.name} ({status})"
    
    def clean(self):
        """Validate the API key format"""
        if self.api_key:
            # Steam API keys are typically 32 characters of hexadecimal
            if len(self.api_key) != 32:
                raise ValidationError("Steam API key should be 32 characters long")
            
            # Check if it's hexadecimal
            try:
                int(self.api_key, 16)
            except ValueError:
                raise ValidationError("Steam API key should contain only hexadecimal characters (0-9, A-F)")
    
    def save(self, *args, **kwargs):
        self.full_clean()
        super().save(*args, **kwargs)
    
    @classmethod
    def get_active_key(cls):
        """Get the currently active API key"""
        return cls.objects.filter(is_active=True).first()
    
    @property
    def masked_key(self):
        """Return a masked version of the API key for display"""
        if not self.api_key:
            return ""
        return f"{self.api_key[:8]}{'*' * 16}{self.api_key[-8:]}"


class SteamCollection(models.Model):
    """Model representing a Steam Workshop collection"""

    # Basic collection info
    steam_id = models.CharField(
        max_length=50, unique=True, help_text="Steam collection ID from URL"
    )
    url = models.URLField(help_text="Full Steam Workshop collection URL")
    title = models.CharField(max_length=255, blank=True, help_text="Collection title")
    description = models.TextField(blank=True, help_text="Collection description")

    # Author information
    author_name = models.CharField(
        max_length=100, blank=True, help_text="Steam username of collection creator"
    )
    author_steam_id = models.CharField(
        max_length=50, blank=True, help_text="Steam ID of collection creator"
    )

    # Collection metadata
    total_items = models.PositiveIntegerField(
        default=0, help_text="Number of items in collection"
    )
    unique_visitors = models.PositiveIntegerField(
        default=0, help_text="Number of unique visitors"
    )
    current_favorites = models.PositiveIntegerField(
        default=0, help_text="Current number of favorites"
    )
    total_favorites = models.PositiveIntegerField(
        default=0, help_text="Total unique favorites"
    )

    # Timestamps
    steam_created_date = models.DateTimeField(
        null=True, blank=True, help_text="When collection was created on Steam"
    )
    steam_updated_date = models.DateTimeField(
        null=True, blank=True, help_text="When collection was last updated on Steam"
    )

    # Local tracking
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    last_fetched = models.DateTimeField(
        null=True, blank=True, help_text="When data was last fetched from Steam"
    )

    # Status
    is_active = models.BooleanField(
        default=True, help_text="Whether this collection is actively tracked"
    )
    fetch_error = models.TextField(
        blank=True, help_text="Last error encountered when fetching data"
    )

    class Meta:
        ordering = ["-created_at"]
        verbose_name = "Steam Collection"
        verbose_name_plural = "Steam Collections"

    def __str__(self):
        return f"{self.title or f'Collection {self.steam_id}'}"

    @property
    def steam_url(self):
        """Generate the Steam Workshop URL from steam_id"""
        return f"https://steamcommunity.com/workshop/filedetails/?id={self.steam_id}"


class SteamCollectionItem(models.Model):
    """Model representing individual items within a Steam collection"""

    # Relationships
    collection = models.ForeignKey(
        SteamCollection, on_delete=models.CASCADE, related_name="items"
    )

    # Item identification
    steam_item_id = models.CharField(max_length=50, help_text="Steam Workshop item ID")
    title = models.CharField(max_length=255, blank=True, help_text="Item title")

    # Author information
    author_name = models.CharField(
        max_length=100, blank=True, help_text="Steam username of item creator"
    )
    author_steam_id = models.CharField(
        max_length=50, blank=True, help_text="Steam ID of item creator"
    )

    # Item metadata
    description = models.TextField(blank=True, help_text="Item description")
    tags = models.JSONField(
        default=list, blank=True, help_text="Item tags as JSON array"
    )

    # Position in collection
    order_index = models.PositiveIntegerField(
        default=0, help_text="Order of item in collection"
    )

    # Timestamps
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        ordering = ["collection", "order_index"]
        unique_together = ["collection", "steam_item_id"]
        verbose_name = "Steam Collection Item"
        verbose_name_plural = "Steam Collection Items"

    def __str__(self):
        return f"{self.title or f'Item {self.steam_item_id}'} (in {self.collection})"

    @property
    def steam_url(self):
        """Generate the Steam Workshop URL for this item"""
        return (
            f"https://steamcommunity.com/workshop/filedetails/?id={self.steam_item_id}"
        )