"""
Organizations forms - Patient, Staff, Department management
"""
from django import forms
from django.utils.translation import gettext_lazy as _

from apps.organizations.models import Patient, Staff, Department, Hospital


class PatientForm(forms.ModelForm):
    """Form for creating and editing patients"""
    
    class Meta:
        model = Patient
        fields = [
            'mrn', 'first_name', 'last_name', 'first_name_ar', 'last_name_ar',
            'national_id', 'date_of_birth', 'gender',
            'phone', 'email', 'address', 'city',
            'primary_hospital', 'status'
        ]
        widgets = {
            'mrn': forms.TextInput(attrs={
                'class': 'form-control',
                'placeholder': 'e.g., PTN-20240101-123456'
            }),
            'first_name': forms.TextInput(attrs={
                'class': 'form-control',
                'placeholder': 'First name in English'
            }),
            'last_name': forms.TextInput(attrs={
                'class': 'form-control',
                'placeholder': 'Last name in English'
            }),
            'first_name_ar': forms.TextInput(attrs={
                'class': 'form-control',
                'placeholder': 'الاسم الأول',
                'dir': 'rtl'
            }),
            'last_name_ar': forms.TextInput(attrs={
                'class': 'form-control',
                'placeholder': 'اسم العائلة',
                'dir': 'rtl'
            }),
            'national_id': forms.TextInput(attrs={
                'class': 'form-control',
                'placeholder': 'National ID / Iqama number'
            }),
            'date_of_birth': forms.DateInput(attrs={
                'class': 'form-control',
                'type': 'date'
            }),
            'gender': forms.Select(attrs={
                'class': 'form-select'
            }),
            'phone': forms.TextInput(attrs={
                'class': 'form-control',
                'placeholder': '+966501234567'
            }),
            'email': forms.EmailInput(attrs={
                'class': 'form-control',
                'placeholder': 'patient@example.com'
            }),
            'address': forms.Textarea(attrs={
                'class': 'form-control',
                'rows': 2,
                'placeholder': 'Street address'
            }),
            'city': forms.TextInput(attrs={
                'class': 'form-control',
                'placeholder': 'City'
            }),
            'primary_hospital': forms.Select(attrs={
                'class': 'form-select'
            }),
            'status': forms.Select(attrs={
                'class': 'form-select'
            }),
        }
    
    def __init__(self, user, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.user = user
        
        # Filter hospital choices based on user permissions
        if user.hospital and not user.is_px_admin():
            self.fields['primary_hospital'].queryset = Hospital.objects.filter(
                id=user.hospital.id,
                status='active'
            )
            self.fields['primary_hospital'].initial = user.hospital
        else:
            self.fields['primary_hospital'].queryset = Hospital.objects.filter(status='active')
        
        # Make MRN optional for creation (will auto-generate if empty)
        if not self.instance.pk:
            self.fields['mrn'].required = False
            self.fields['mrn'].help_text = _('Leave blank to auto-generate')
    
    def clean_mrn(self):
        """Validate MRN is unique"""
        mrn = self.cleaned_data.get('mrn')
        if not mrn:
            return mrn
        
        # Check uniqueness (excluding current instance)
        queryset = Patient.objects.filter(mrn=mrn)
        if self.instance.pk:
            queryset = queryset.exclude(pk=self.instance.pk)
        
        if queryset.exists():
            raise forms.ValidationError(_('A patient with this MRN already exists.'))
        
        return mrn
    
    def clean_phone(self):
        """Normalize phone number"""
        phone = self.cleaned_data.get('phone', '')
        if phone:
            # Remove spaces and dashes
            phone = phone.replace(' ', '').replace('-', '')
        return phone
    
    def save(self, commit=True):
        """Auto-generate MRN if not provided"""
        instance = super().save(commit=False)
        
        if not instance.mrn:
            instance.mrn = Patient.generate_mrn()
        
        if commit:
            instance.save()
        
        return instance


class StaffForm(forms.ModelForm):
    """Form for creating and editing staff"""
    
    class Meta:
        model = Staff
        fields = [
            'employee_id', 'first_name', 'last_name', 'first_name_ar', 'last_name_ar',
            'name', 'name_ar', 'staff_type', 'job_title', 'job_title_ar',
            'specialization', 'license_number', 'email', 'phone',
            'hospital', 'department', 'section_fk', 'subsection_fk',
            'report_to', 'is_head', 'gender', 'status'
        ]
        widgets = {
            'employee_id': forms.TextInput(attrs={'class': 'form-control'}),
            'first_name': forms.TextInput(attrs={'class': 'form-control'}),
            'last_name': forms.TextInput(attrs={'class': 'form-control'}),
            'first_name_ar': forms.TextInput(attrs={'class': 'form-control', 'dir': 'rtl'}),
            'last_name_ar': forms.TextInput(attrs={'class': 'form-control', 'dir': 'rtl'}),
            'name': forms.TextInput(attrs={'class': 'form-control'}),
            'name_ar': forms.TextInput(attrs={'class': 'form-control', 'dir': 'rtl'}),
            'staff_type': forms.Select(attrs={'class': 'form-select'}),
            'job_title': forms.TextInput(attrs={'class': 'form-control'}),
            'job_title_ar': forms.TextInput(attrs={'class': 'form-control', 'dir': 'rtl'}),
            'specialization': forms.TextInput(attrs={'class': 'form-control'}),
            'license_number': forms.TextInput(attrs={'class': 'form-control'}),
            'email': forms.EmailInput(attrs={'class': 'form-control'}),
            'phone': forms.TextInput(attrs={'class': 'form-control'}),
            'hospital': forms.Select(attrs={'class': 'form-select'}),
            'department': forms.Select(attrs={'class': 'form-select'}),
            'section_fk': forms.Select(attrs={'class': 'form-select'}),
            'subsection_fk': forms.Select(attrs={'class': 'form-select'}),
            'report_to': forms.Select(attrs={'class': 'form-select'}),
            'is_head': forms.CheckboxInput(attrs={'class': 'form-check-input'}),
            'gender': forms.Select(attrs={'class': 'form-select'}),
            'status': forms.Select(attrs={'class': 'form-select'}),
        }