"""
Serializers for Rides API following Django styleguide patterns.
"""

from rest_framework import serializers
from ..models import Ride, RideModel, Company


class RideModelOutputSerializer(serializers.Serializer):
    """Output serializer for ride model data."""
    id = serializers.IntegerField()
    name = serializers.CharField()
    description = serializers.CharField()
    category = serializers.CharField()
    manufacturer = serializers.SerializerMethodField()
    
    def get_manufacturer(self, obj):
        if obj.manufacturer:
            return {
                'id': obj.manufacturer.id,
                'name': obj.manufacturer.name,
                'slug': obj.manufacturer.slug
            }
        return None


class RideParkOutputSerializer(serializers.Serializer):
    """Output serializer for ride's park data."""
    id = serializers.IntegerField()
    name = serializers.CharField()
    slug = serializers.CharField()


class RideListOutputSerializer(serializers.Serializer):
    """Output serializer for ride list view."""
    id = serializers.IntegerField()
    name = serializers.CharField()
    slug = serializers.CharField()
    category = serializers.CharField()
    status = serializers.CharField()
    description = serializers.CharField()
    
    # Park info
    park = RideParkOutputSerializer()
    
    # Statistics
    average_rating = serializers.DecimalField(max_digits=3, decimal_places=2, allow_null=True)
    capacity_per_hour = serializers.IntegerField(allow_null=True)
    
    # Dates
    opening_date = serializers.DateField(allow_null=True)
    closing_date = serializers.DateField(allow_null=True)
    
    # Metadata
    created_at = serializers.DateTimeField()
    updated_at = serializers.DateTimeField()


class RideDetailOutputSerializer(serializers.Serializer):
    """Output serializer for ride detail view."""
    id = serializers.IntegerField()
    name = serializers.CharField()
    slug = serializers.CharField()
    category = serializers.CharField()
    status = serializers.CharField()
    post_closing_status = serializers.CharField(allow_null=True)
    description = serializers.CharField()
    
    # Park info
    park = RideParkOutputSerializer()
    park_area = serializers.SerializerMethodField()
    
    # Dates
    opening_date = serializers.DateField(allow_null=True)
    closing_date = serializers.DateField(allow_null=True)
    status_since = serializers.DateField(allow_null=True)
    
    # Physical specs
    min_height_in = serializers.IntegerField(allow_null=True)
    max_height_in = serializers.IntegerField(allow_null=True)
    capacity_per_hour = serializers.IntegerField(allow_null=True)
    ride_duration_seconds = serializers.IntegerField(allow_null=True)
    
    # Statistics
    average_rating = serializers.DecimalField(max_digits=3, decimal_places=2, allow_null=True)
    
    # Companies
    manufacturer = serializers.SerializerMethodField()
    designer = serializers.SerializerMethodField()
    
    # Model
    ride_model = RideModelOutputSerializer(allow_null=True)
    
    # Metadata
    created_at = serializers.DateTimeField()
    updated_at = serializers.DateTimeField()
    
    def get_park_area(self, obj):
        if obj.park_area:
            return {
                'id': obj.park_area.id,
                'name': obj.park_area.name,
                'slug': obj.park_area.slug
            }
        return None
    
    def get_manufacturer(self, obj):
        if obj.manufacturer:
            return {
                'id': obj.manufacturer.id,
                'name': obj.manufacturer.name,
                'slug': obj.manufacturer.slug
            }
        return None
    
    def get_designer(self, obj):
        if obj.designer:
            return {
                'id': obj.designer.id,
                'name': obj.designer.name,
                'slug': obj.designer.slug
            }
        return None


class RideCreateInputSerializer(serializers.Serializer):
    """Input serializer for creating rides."""
    name = serializers.CharField(max_length=255)
    description = serializers.CharField(allow_blank=True, default="")
    category = serializers.ChoiceField(choices=Ride.CATEGORY_CHOICES)
    status = serializers.ChoiceField(
        choices=Ride.STATUS_CHOICES,
        default="OPERATING"
    )
    
    # Required park
    park_id = serializers.IntegerField()
    
    # Optional area
    park_area_id = serializers.IntegerField(required=False, allow_null=True)
    
    # Optional dates
    opening_date = serializers.DateField(required=False, allow_null=True)
    closing_date = serializers.DateField(required=False, allow_null=True)
    status_since = serializers.DateField(required=False, allow_null=True)
    
    # Optional specs
    min_height_in = serializers.IntegerField(
        required=False, 
        allow_null=True,
        min_value=30,
        max_value=90
    )
    max_height_in = serializers.IntegerField(
        required=False, 
        allow_null=True,
        min_value=30,
        max_value=90
    )
    capacity_per_hour = serializers.IntegerField(
        required=False, 
        allow_null=True,
        min_value=1
    )
    ride_duration_seconds = serializers.IntegerField(
        required=False, 
        allow_null=True,
        min_value=1
    )
    
    # Optional companies
    manufacturer_id = serializers.IntegerField(required=False, allow_null=True)
    designer_id = serializers.IntegerField(required=False, allow_null=True)
    
    # Optional model
    ride_model_id = serializers.IntegerField(required=False, allow_null=True)
    
    def validate(self, data):
        """Cross-field validation."""
        # Date validation
        opening_date = data.get('opening_date')
        closing_date = data.get('closing_date')
        
        if opening_date and closing_date and closing_date < opening_date:
            raise serializers.ValidationError(
                "Closing date cannot be before opening date"
            )
        
        # Height validation
        min_height = data.get('min_height_in')
        max_height = data.get('max_height_in')
        
        if min_height and max_height and min_height > max_height:
            raise serializers.ValidationError(
                "Minimum height cannot be greater than maximum height"
            )
        
        return data


class RideUpdateInputSerializer(serializers.Serializer):
    """Input serializer for updating rides."""
    name = serializers.CharField(max_length=255, required=False)
    description = serializers.CharField(allow_blank=True, required=False)
    category = serializers.ChoiceField(choices=Ride.CATEGORY_CHOICES, required=False)
    status = serializers.ChoiceField(choices=Ride.STATUS_CHOICES, required=False)
    post_closing_status = serializers.ChoiceField(
        choices=Ride.POST_CLOSING_STATUS_CHOICES, 
        required=False,
        allow_null=True
    )
    
    # Park and area
    park_id = serializers.IntegerField(required=False)
    park_area_id = serializers.IntegerField(required=False, allow_null=True)
    
    # Dates
    opening_date = serializers.DateField(required=False, allow_null=True)
    closing_date = serializers.DateField(required=False, allow_null=True)
    status_since = serializers.DateField(required=False, allow_null=True)
    
    # Specs
    min_height_in = serializers.IntegerField(
        required=False, 
        allow_null=True,
        min_value=30,
        max_value=90
    )
    max_height_in = serializers.IntegerField(
        required=False, 
        allow_null=True,
        min_value=30,
        max_value=90
    )
    capacity_per_hour = serializers.IntegerField(
        required=False, 
        allow_null=True,
        min_value=1
    )
    ride_duration_seconds = serializers.IntegerField(
        required=False, 
        allow_null=True,
        min_value=1
    )
    
    # Companies
    manufacturer_id = serializers.IntegerField(required=False, allow_null=True)
    designer_id = serializers.IntegerField(required=False, allow_null=True)
    
    # Model
    ride_model_id = serializers.IntegerField(required=False, allow_null=True)
    
    def validate(self, data):
        """Cross-field validation."""
        # Date validation
        opening_date = data.get('opening_date')
        closing_date = data.get('closing_date')
        
        if opening_date and closing_date and closing_date < opening_date:
            raise serializers.ValidationError(
                "Closing date cannot be before opening date"
            )
        
        # Height validation
        min_height = data.get('min_height_in')
        max_height = data.get('max_height_in')
        
        if min_height and max_height and min_height > max_height:
            raise serializers.ValidationError(
                "Minimum height cannot be greater than maximum height"
            )
        
        return data


class RideFilterInputSerializer(serializers.Serializer):
    """Input serializer for ride filtering and search."""
    # Search
    search = serializers.CharField(required=False, allow_blank=True)
    
    # Category filter
    category = serializers.MultipleChoiceField(
        choices=Ride.CATEGORY_CHOICES,
        required=False
    )
    
    # Status filter
    status = serializers.MultipleChoiceField(
        choices=Ride.STATUS_CHOICES,
        required=False
    )
    
    # Park filter
    park_id = serializers.IntegerField(required=False)
    park_slug = serializers.CharField(required=False, allow_blank=True)
    
    # Company filters
    manufacturer_id = serializers.IntegerField(required=False)
    designer_id = serializers.IntegerField(required=False)
    
    # Rating filter
    min_rating = serializers.DecimalField(
        max_digits=3, 
        decimal_places=2, 
        required=False,
        min_value=1,
        max_value=10
    )
    
    # Height filters
    min_height_requirement = serializers.IntegerField(required=False)
    max_height_requirement = serializers.IntegerField(required=False)
    
    # Capacity filter
    min_capacity = serializers.IntegerField(required=False)
    
    # Ordering
    ordering = serializers.ChoiceField(
        choices=[
            'name', '-name',
            'opening_date', '-opening_date',
            'average_rating', '-average_rating',
            'capacity_per_hour', '-capacity_per_hour',
            'created_at', '-created_at'
        ],
        required=False,
        default='name'
    )


class RideStatsOutputSerializer(serializers.Serializer):
    """Output serializer for ride statistics."""
    total_rides = serializers.IntegerField()
    operating_rides = serializers.IntegerField()
    closed_rides = serializers.IntegerField()
    under_construction = serializers.IntegerField()
    
    # By category
    rides_by_category = serializers.DictField()
    
    # Averages
    average_rating = serializers.DecimalField(max_digits=3, decimal_places=2, allow_null=True)
    average_capacity = serializers.DecimalField(max_digits=8, decimal_places=2, allow_null=True)
    
    # Top manufacturers
    top_manufacturers = serializers.ListField(child=serializers.DictField())
    
    # Recently added
    recently_added_count = serializers.IntegerField()