"""
Complaints serializers
"""
from rest_framework import serializers

from .models import Complaint, ComplaintAttachment, ComplaintUpdate, Inquiry


class ComplaintAttachmentSerializer(serializers.ModelSerializer):
    """Complaint attachment serializer"""
    uploaded_by_name = serializers.SerializerMethodField()
    
    class Meta:
        model = ComplaintAttachment
        fields = [
            'id', 'complaint', 'file', 'filename', 'file_type', 'file_size',
            'uploaded_by', 'uploaded_by_name', 'description',
            'created_at', 'updated_at'
        ]
        read_only_fields = ['id', 'file_size', 'created_at', 'updated_at']
    
    def get_uploaded_by_name(self, obj):
        """Get uploader name"""
        if obj.uploaded_by:
            return obj.uploaded_by.get_full_name()
        return None


class ComplaintUpdateSerializer(serializers.ModelSerializer):
    """Complaint update serializer"""
    created_by_name = serializers.SerializerMethodField()
    
    class Meta:
        model = ComplaintUpdate
        fields = [
            'id', 'complaint', 'update_type', 'message',
            'created_by', 'created_by_name',
            'old_status', 'new_status', 'metadata',
            'created_at', 'updated_at'
        ]
        read_only_fields = ['id', 'created_at', 'updated_at']
    
    def get_created_by_name(self, obj):
        """Get creator name"""
        if obj.created_by:
            return obj.created_by.get_full_name()
        return None


class ComplaintSerializer(serializers.ModelSerializer):
    """Complaint serializer"""
    patient_name = serializers.CharField(source='patient.get_full_name', read_only=True)
    patient_mrn = serializers.CharField(source='patient.mrn', read_only=True)
    hospital_name = serializers.CharField(source='hospital.name', read_only=True)
    department_name = serializers.CharField(source='department.name', read_only=True)
    physician_name = serializers.SerializerMethodField()
    assigned_to_name = serializers.SerializerMethodField()
    attachments = ComplaintAttachmentSerializer(many=True, read_only=True)
    updates = ComplaintUpdateSerializer(many=True, read_only=True)
    sla_status = serializers.SerializerMethodField()
    
    class Meta:
        model = Complaint
        fields = [
            'id', 'patient', 'patient_name', 'patient_mrn', 'encounter_id',
            'hospital', 'hospital_name', 'department', 'department_name',
            'physician', 'physician_name',
            'title', 'description', 'category', 'subcategory',
            'priority', 'severity', 'source', 'status',
            'assigned_to', 'assigned_to_name', 'assigned_at',
            'due_at', 'is_overdue', 'sla_status',
            'reminder_sent_at', 'escalated_at',
            'resolution', 'resolved_at', 'resolved_by',
            'closed_at', 'closed_by',
            'resolution_survey', 'resolution_survey_sent_at',
            'attachments', 'updates', 'metadata',
            'created_at', 'updated_at'
        ]
        read_only_fields = [
            'id', 'assigned_at', 'is_overdue',
            'reminder_sent_at', 'escalated_at',
            'resolved_at', 'closed_at', 'resolution_survey_sent_at',
            'created_at', 'updated_at'
        ]
    
    def get_physician_name(self, obj):
        """Get physician name"""
        if obj.physician:
            return obj.physician.get_full_name()
        return None
    
    def get_assigned_to_name(self, obj):
        """Get assigned user name"""
        if obj.assigned_to:
            return obj.assigned_to.get_full_name()
        return None
    
    def get_sla_status(self, obj):
        """Get SLA status"""
        if obj.is_overdue:
            return 'overdue'
        
        from django.utils import timezone
        time_remaining = obj.due_at - timezone.now()
        hours_remaining = time_remaining.total_seconds() / 3600
        
        if hours_remaining < 4:
            return 'due_soon'
        return 'on_time'


class ComplaintListSerializer(serializers.ModelSerializer):
    """Simplified complaint serializer for list views"""
    patient_name = serializers.CharField(source='patient.get_full_name', read_only=True)
    hospital_name = serializers.CharField(source='hospital.name', read_only=True)
    sla_status = serializers.SerializerMethodField()
    
    class Meta:
        model = Complaint
        fields = [
            'id', 'title', 'patient_name', 'hospital_name',
            'category', 'severity', 'status', 'sla_status',
            'assigned_to', 'created_at'
        ]
    
    def get_sla_status(self, obj):
        """Get SLA status"""
        if obj.is_overdue:
            return 'overdue'
        
        from django.utils import timezone
        time_remaining = obj.due_at - timezone.now()
        hours_remaining = time_remaining.total_seconds() / 3600
        
        if hours_remaining < 4:
            return 'due_soon'
        return 'on_time'


class InquirySerializer(serializers.ModelSerializer):
    """Inquiry serializer"""
    patient_name = serializers.CharField(source='patient.get_full_name', read_only=True)
    hospital_name = serializers.CharField(source='hospital.name', read_only=True)
    department_name = serializers.CharField(source='department.name', read_only=True)
    assigned_to_name = serializers.SerializerMethodField()
    
    class Meta:
        model = Inquiry
        fields = [
            'id', 'patient', 'patient_name',
            'contact_name', 'contact_phone', 'contact_email',
            'hospital', 'hospital_name', 'department', 'department_name',
            'subject', 'message', 'category', 'status',
            'assigned_to', 'assigned_to_name',
            'response', 'responded_at', 'responded_by',
            'created_at', 'updated_at'
        ]
        read_only_fields = ['id', 'responded_at', 'created_at', 'updated_at']
    
    def get_assigned_to_name(self, obj):
        """Get assigned user name"""
        if obj.assigned_to:
            return obj.assigned_to.get_full_name()
        return None