"""
Organizations serializers
"""
from rest_framework import serializers

from .models import Department, Hospital, Organization, Patient, Staff


class OrganizationSerializer(serializers.ModelSerializer):
    """Organization serializer"""
    hospitals_count = serializers.SerializerMethodField()

    class Meta:
        model = Organization
        fields = [
            'id', 'name', 'name_ar', 'code', 'address', 'city',
            'phone', 'email', 'website', 'status', 'license_number',
            'logo', 'hospitals_count', 'created_at', 'updated_at'
        ]
        read_only_fields = ['id', 'created_at', 'updated_at']

    def get_hospitals_count(self, obj):
        """Get count of hospitals in this organization"""
        return obj.hospitals.count()


class HospitalSerializer(serializers.ModelSerializer):
    """Hospital serializer"""
    organization_name = serializers.CharField(source='organization.name', read_only=True)
    departments_count = serializers.SerializerMethodField()

    class Meta:
        model = Hospital
        fields = [
            'id', 'organization', 'organization_name', 'name', 'name_ar', 'code',
            'address', 'city', 'phone', 'email', 'status',
            'license_number', 'capacity', 'departments_count',
            'created_at', 'updated_at'
        ]
        read_only_fields = ['id', 'created_at', 'updated_at']

    def get_departments_count(self, obj):
        """Get count of departments in this hospital"""
        return obj.departments.count()


class DepartmentSerializer(serializers.ModelSerializer):
    """Department serializer"""
    hospital_name = serializers.CharField(source='hospital.name', read_only=True)
    parent_name = serializers.CharField(source='parent.name', read_only=True)
    manager_name = serializers.SerializerMethodField()

    class Meta:
        model = Department
        fields = [
            'id', 'hospital', 'hospital_name', 'name', 'name_ar', 'code',
            'parent', 'parent_name', 'manager', 'manager_name',
            'phone', 'email', 'location', 'status',
            'created_at', 'updated_at'
        ]
        read_only_fields = ['id', 'created_at', 'updated_at']

    def get_manager_name(self, obj):
        """Get manager full name"""
        if obj.manager:
            return obj.manager.get_full_name()
        return None


class StaffSerializer(serializers.ModelSerializer):
    """Staff serializer"""
    hospital_name = serializers.CharField(source='hospital.name', read_only=True)
    department_name = serializers.CharField(source='department.name', read_only=True)
    full_name = serializers.CharField(source='get_full_name', read_only=True)
    user_email = serializers.EmailField(source='user.email', read_only=True, allow_null=True)
    has_user_account = serializers.BooleanField(read_only=True)
    
    # User creation fields (write-only)
    create_user = serializers.BooleanField(write_only=True, required=False, default=False)
    user_username = serializers.CharField(write_only=True, required=False, allow_blank=True)
    user_password = serializers.CharField(write_only=True, required=False, allow_blank=True)
    send_email = serializers.BooleanField(write_only=True, required=False, default=True)

    class Meta:
        model = Staff
        fields = [
            'id', 'user', 'first_name', 'last_name', 'first_name_ar', 'last_name_ar',
            'full_name', 'staff_type', 'job_title',
            'license_number', 'specialization', 'employee_id',
            'hospital', 'hospital_name', 'department', 'department_name',
            'user_email', 'has_user_account', 'status',
            'created_at', 'updated_at',
            'create_user', 'user_username', 'user_password', 'send_email'
        ]
        read_only_fields = ['id', 'created_at', 'updated_at']
    
    def to_representation(self, instance):
        """Customize representation"""
        data = super().to_representation(instance)
        data['has_user_account'] = instance.user is not None
        return data
    
    def create(self, validated_data):
        """Create staff with optional user account"""
        # Extract user creation fields
        create_user = validated_data.pop('create_user', False)
        user_username = validated_data.pop('user_username', '')
        user_password = validated_data.pop('user_password', '')
        send_email = validated_data.pop('send_email', True)
        
        # Create staff instance
        staff = Staff.objects.create(**validated_data)
        
        # Optionally create user account
        if create_user and not staff.user:
            from .services import StaffService
            
            # Determine role based on staff_type
            role = StaffService.get_staff_type_role(staff.staff_type)
            
            # Create user account
            try:
                user, password = StaffService.create_user_for_staff(
                    staff, 
                    role=role, 
                    request=self.context.get('request')
                )
                
                # Send email if requested
                if send_email and self.context.get('request'):
                    try:
                        StaffService.send_credentials_email(
                            staff, 
                            password, 
                            self.context['request']
                        )
                    except Exception as e:
                        # Log but don't fail if email sending fails
                        pass
            except ValueError as e:
                # If user creation fails, still return the staff
                pass
        
        return staff
    
    def update(self, instance, validated_data):
        """Update staff with optional user account creation"""
        # Extract user creation fields
        create_user = validated_data.pop('create_user', False)
        user_username = validated_data.pop('user_username', '')
        user_password = validated_data.pop('user_password', '')
        send_email = validated_data.pop('send_email', True)
        
        # Update staff fields
        for attr, value in validated_data.items():
            setattr(instance, value)
        
        instance.save()
        
        # Optionally create user account if it doesn't exist
        if create_user and not instance.user:
            from .services import StaffService
            
            # Determine role based on staff_type
            role = StaffService.get_staff_type_role(instance.staff_type)
            
            try:
                user, password = StaffService.create_user_for_staff(
                    instance, 
                    role=role, 
                    request=self.context.get('request')
                )
                
                # Send email if requested
                if send_email and self.context.get('request'):
                    try:
                        StaffService.send_credentials_email(
                            instance, 
                            password, 
                            self.context['request']
                        )
                    except Exception as e:
                        pass
            except ValueError as e:
                pass
        
        return instance


class PatientSerializer(serializers.ModelSerializer):
    """Patient serializer"""
    primary_hospital_name = serializers.CharField(source='primary_hospital.name', read_only=True)
    full_name = serializers.CharField(source='get_full_name', read_only=True)
    age = serializers.SerializerMethodField()

    class Meta:
        model = Patient
        fields = [
            'id', 'mrn', 'national_id', 'first_name', 'last_name',
            'first_name_ar', 'last_name_ar', 'full_name',
            'date_of_birth', 'age', 'gender',
            'phone', 'email', 'address', 'city',
            'primary_hospital', 'primary_hospital_name', 'status',
            'created_at', 'updated_at'
        ]
        read_only_fields = ['id', 'created_at', 'updated_at']

    def get_age(self, obj):
        """Calculate patient age"""
        if obj.date_of_birth:
            from datetime import date
            today = date.today()
            return today.year - obj.date_of_birth.year - (
                (today.month, today.day) < (obj.date_of_birth.month, obj.date_of_birth.day)
            )
        return None


class PatientListSerializer(serializers.ModelSerializer):
    """Simplified patient serializer for list views"""
    full_name = serializers.CharField(source='get_full_name', read_only=True)
    primary_hospital_name = serializers.CharField(source='primary_hospital.name', read_only=True)

    class Meta:
        model = Patient
        fields = [
            'id', 'mrn', 'full_name', 'phone', 'email',
            'primary_hospital_name', 'status'
        ]