"""
Park media serializers for ThrillWiki API v1.

This module contains serializers for park-specific media functionality.
Enhanced from rogue implementation to maintain full feature parity.
"""

from rest_framework import serializers
from drf_spectacular.utils import extend_schema_field, extend_schema_serializer, OpenApiExample
from apps.parks.models import Park, ParkPhoto


@extend_schema_serializer(
    examples=[
        OpenApiExample(
            name='Park Photo with Cloudflare Images',
            summary='Complete park photo response',
            description='Example response showing all fields including Cloudflare Images URLs and variants',
            value={
                'id': 456,
                'image': 'https://imagedelivery.net/account-hash/def456ghi789/public',
                'image_url': 'https://imagedelivery.net/account-hash/def456ghi789/public',
                'image_variants': {
                    'thumbnail': 'https://imagedelivery.net/account-hash/def456ghi789/thumbnail',
                    'medium': 'https://imagedelivery.net/account-hash/def456ghi789/medium',
                    'large': 'https://imagedelivery.net/account-hash/def456ghi789/large',
                    'public': 'https://imagedelivery.net/account-hash/def456ghi789/public'
                },
                'caption': 'Beautiful park entrance',
                'alt_text': 'Main entrance gate with decorative archway',
                'is_primary': True,
                'is_approved': True,
                'created_at': '2023-01-01T12:00:00Z',
                'updated_at': '2023-01-01T12:00:00Z',
                'date_taken': '2023-01-01T11:00:00Z',
                'uploaded_by_username': 'parkfan456',
                'file_size': 1536000,
                'dimensions': [1600, 900],
                'park_slug': 'cedar-point',
                'park_name': 'Cedar Point'
            }
        )
    ]
)
class ParkPhotoOutputSerializer(serializers.ModelSerializer):
    """Enhanced output serializer for park photos with Cloudflare Images support."""

    uploaded_by_username = serializers.CharField(
        source="uploaded_by.username", read_only=True
    )

    file_size = serializers.SerializerMethodField()
    dimensions = serializers.SerializerMethodField()
    image_url = serializers.SerializerMethodField()
    image_variants = serializers.SerializerMethodField()

    @extend_schema_field(
        serializers.IntegerField(allow_null=True, help_text="File size in bytes")
    )
    def get_file_size(self, obj):
        """Get file size in bytes."""
        return obj.file_size

    @extend_schema_field(
        serializers.ListField(
            child=serializers.IntegerField(),
            min_length=2,
            max_length=2,
            allow_null=True,
            help_text="Image dimensions as [width, height] in pixels",
        )
    )
    def get_dimensions(self, obj):
        """Get image dimensions as [width, height]."""
        return obj.dimensions

    @extend_schema_field(
        serializers.URLField(
            help_text="Full URL to the Cloudflare Images asset",
            allow_null=True
        )
    )
    def get_image_url(self, obj):
        """Get the full Cloudflare Images URL."""
        if obj.image:
            return obj.image.url
        return None

    @extend_schema_field(
        serializers.DictField(
            child=serializers.URLField(),
            help_text="Available Cloudflare Images variants with their URLs"
        )
    )
    def get_image_variants(self, obj):
        """Get available image variants from Cloudflare Images."""
        if not obj.image:
            return {}

        # Common variants for park photos
        variants = {
            'thumbnail': f"{obj.image.url}/thumbnail",
            'medium': f"{obj.image.url}/medium",
            'large': f"{obj.image.url}/large",
            'public': f"{obj.image.url}/public"
        }
        return variants

    park_slug = serializers.CharField(source="park.slug", read_only=True)
    park_name = serializers.CharField(source="park.name", read_only=True)

    class Meta:
        model = ParkPhoto
        fields = [
            "id",
            "image",
            "image_url",
            "image_variants",
            "caption",
            "alt_text",
            "is_primary",
            "is_approved",
            "created_at",
            "updated_at",
            "date_taken",
            "uploaded_by_username",
            "file_size",
            "dimensions",
            "park_slug",
            "park_name",
        ]
        read_only_fields = [
            "id",
            "image_url",
            "image_variants",
            "created_at",
            "updated_at",
            "uploaded_by_username",
            "file_size",
            "dimensions",
            "park_slug",
            "park_name",
        ]


class ParkPhotoCreateInputSerializer(serializers.ModelSerializer):
    """Input serializer for creating park photos."""

    class Meta:
        model = ParkPhoto
        fields = [
            "image",
            "caption",
            "alt_text",
            "is_primary",
        ]


class ParkPhotoUpdateInputSerializer(serializers.ModelSerializer):
    """Input serializer for updating park photos."""

    class Meta:
        model = ParkPhoto
        fields = [
            "caption",
            "alt_text",
            "is_primary",
        ]


class ParkPhotoListOutputSerializer(serializers.ModelSerializer):
    """Optimized output serializer for park photo lists."""

    uploaded_by_username = serializers.CharField(
        source="uploaded_by.username", read_only=True
    )

    class Meta:
        model = ParkPhoto
        fields = [
            "id",
            "image",
            "caption",
            "is_primary",
            "is_approved",
            "created_at",
            "uploaded_by_username",
        ]
        read_only_fields = fields


class ParkPhotoApprovalInputSerializer(serializers.Serializer):
    """Input serializer for bulk photo approval operations."""

    photo_ids = serializers.ListField(
        child=serializers.IntegerField(), help_text="List of photo IDs to approve"
    )
    approve = serializers.BooleanField(
        default=True, help_text="Whether to approve (True) or reject (False) the photos"
    )


class ParkPhotoStatsOutputSerializer(serializers.Serializer):
    """Output serializer for park photo statistics."""

    total_photos = serializers.IntegerField()
    approved_photos = serializers.IntegerField()
    pending_photos = serializers.IntegerField()
    has_primary = serializers.BooleanField()
    recent_uploads = serializers.IntegerField()


# Legacy serializers for backwards compatibility
class ParkPhotoSerializer(serializers.ModelSerializer):
    """Legacy serializer for the ParkPhoto model - maintained for compatibility."""

    class Meta:
        model = ParkPhoto
        fields = (
            "id",
            "image",
            "caption",
            "alt_text",
            "is_primary",
            "uploaded_at",
            "uploaded_by",
        )


class ParkSerializer(serializers.ModelSerializer):
    """Serializer for the Park model."""

    class Meta:
        model = Park
        fields = (
            "id",
            "name",
            "slug",
            "country",
            "continent",
            "latitude",
            "longitude",
            "website",
            "status",
        )