"""
Django admin configuration for referrals app.
"""

from django.contrib import admin
from django.utils.translation import gettext_lazy as _
from django.utils.html import format_html
from simple_history.admin import SimpleHistoryAdmin

from .models import Referral


@admin.register(Referral)
class ReferralAdmin(SimpleHistoryAdmin):
    """Admin interface for Referral model."""
    
    list_display = ['patient', 'from_clinic', 'to_clinic', 'priority', 'status', 'referred_by', 'created_at']
    list_filter = ['priority', 'status', 'referral_type', 'from_clinic', 'to_clinic', 'tenant', 'created_at']
    search_fields = ['patient__mrn', 'patient__first_name_en', 'patient__last_name_en', 'reason']
    readonly_fields = ['id', 'created_at', 'updated_at', 'acknowledged_at', 'appointment_booked_at', 
                       'completed_at', 'declined_at', 'get_status_badge']
    date_hierarchy = 'created_at'
    
    fieldsets = (
        (_('Patient & Clinics'), {
            'fields': ('patient', 'tenant', 'from_clinic', 'to_clinic')
        }),
        (_('Referral Details'), {
            'fields': ('referral_type', 'priority', 'reason', 'clinical_notes')
        }),
        (_('Workflow'), {
            'fields': ('referred_by', 'referred_to', 'status', 'get_status_badge')
        }),
        (_('Acknowledgment'), {
            'fields': ('acknowledged_at', 'acknowledged_by'),
            'classes': ('collapse',)
        }),
        (_('Appointment'), {
            'fields': ('appointment', 'appointment_booked_at', 'appointment_booked_by'),
            'classes': ('collapse',)
        }),
        (_('Completion'), {
            'fields': ('completed_at', 'outcome_notes'),
            'classes': ('collapse',)
        }),
        (_('Decline/Cancel'), {
            'fields': ('declined_at', 'declined_by', 'decline_reason'),
            'classes': ('collapse',)
        }),
        (_('Metadata'), {
            'fields': ('id', 'created_at', 'updated_at'),
            'classes': ('collapse',)
        }),
    )
    
    def get_status_badge(self, obj):
        """Display status with color badge."""
        colors = {
            'PENDING': '#ffc107',
            'ACKNOWLEDGED': '#17a2b8',
            'APPOINTMENT_BOOKED': '#28a745',
            'COMPLETED': '#6c757d',
            'DECLINED': '#dc3545',
            'CANCELLED': '#6c757d',
        }
        return format_html(
            '<span style="background-color: {}; color: white; padding: 5px 10px; border-radius: 3px; font-weight: bold;">{}</span>',
            colors.get(obj.status, '#6c757d'),
            obj.get_status_display()
        )
    
    get_status_badge.short_description = _('Status')
    
    def save_model(self, request, obj, form, change):
        """Set referred_by on creation."""
        if not change:
            obj.referred_by = request.user
        super().save_model(request, obj, form, change)