"""
Diagnostic script to identify why survey links show as invalid.
"""
import os
import django

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'PX360.settings')
django.setup()

from apps.surveys.models import SurveyInstance, SurveyStatus
from django.utils import timezone

print("="*80)
print("SURVEY LINK ISSUE DIAGNOSTIC")
print("="*80)

# 1. Check SurveyStatus choices
print("\n1. Available SurveyStatus Choices:")
for choice in SurveyStatus.choices:
    print(f"   - {choice[1]} (value: '{choice[0]}')")

# 2. Check recent surveys
print("\n2. Recent Survey Instances (last 5):")
recent_surveys = SurveyInstance.objects.order_by('-created_at')[:5]
for survey in recent_surveys:
    print(f"\n   Survey ID: {survey.id}")
    print(f"   Status: '{survey.status}'")
    print(f"   Token: {survey.access_token[:20]}...")
    print(f"   Token Expires: {survey.token_expires_at}")
    print(f"   URL: {survey.get_survey_url()}")
    print(f"   Template: {survey.survey_template.name}")
    print(f"   Patient: {survey.patient.get_full_name()}")

# 3. Check if status matches expected values
print("\n3. Status Validation Check:")
print("\n   survey_form view expects status in: ['pending', 'sent', 'viewed', 'in_progress']")
print("\n   Actual survey statuses in database:")
for survey in recent_surveys:
    expected_statuses = ['pending', 'sent', 'viewed', 'in_progress']
    is_valid = survey.status in expected_statuses
    status_match = survey.status in [c[0] for c in SurveyStatus.choices]
    
    print(f"\n   Survey {survey.id}:")
    print(f"     - Status value: '{survey.status}'")
    print(f"     - In expected list: {is_valid}")
    print(f"     - Matches SurveyStatus choices: {status_match}")
    
    if not status_match:
        print(f"     ⚠️  WARNING: Status '{survey.status}' not in SurveyStatus choices!")
    
    if not is_valid:
        print(f"     ⚠️  WARNING: Status '{survey.status}' will cause link to be invalid!")

# 4. Check token expiration
print("\n4. Token Expiration Check:")
for survey in recent_surveys:
    is_expired = survey.token_expires_at and survey.token_expires_at < timezone.now()
    print(f"\n   Survey {survey.id}:")
    print(f"     - Expires at: {survey.token_expires_at}")
    print(f"     - Is expired: {is_expired}")
    if is_expired:
        print(f"     ⚠️  WARNING: Token is expired!")

# 5. Test access simulation
print("\n5. Simulating survey_form view check:")
print("\n   Looking for surveys that WOULD match the view's criteria:")
print("   Criteria: status in ['pending', 'sent', 'viewed', 'in_progress']")
print("            token_expires_at > now")
print("            access_token = <token>")

matching_surveys = SurveyInstance.objects.filter(
    status__in=['pending', 'sent', 'viewed', 'in_progress'],
    token_expires_at__gt=timezone.now()
)

print(f"\n   Found {matching_surveys.count()} surveys that would be accessible")

# 6. Show all unique status values in database
print("\n6. All unique status values in database:")
unique_statuses = SurveyInstance.objects.values_list('status', flat=True).distinct()
for status in unique_statuses:
    count = SurveyInstance.objects.filter(status=status).count()
    print(f"   - '{status}': {count} surveys")

# 7. Recommendation
print("\n" + "="*80)
print("DIAGNOSIS SUMMARY")
print("="*80)

has_invalid_status = any(
    s.status not in ['pending', 'sent', 'viewed', 'in_progress'] 
    for s in recent_surveys
)

if has_invalid_status:
    print("\n❌ PROBLEM IDENTIFIED:")
    print("   Survey status values don't match what the view expects.")
    print("\n   Root Cause:")
    print("   - Surveys are created with status='PENDING' (uppercase)")
    print("   - View expects status='pending' (lowercase)")
    print("   - SurveyStatus may not have a PENDING choice")
    print("\n   Solution:")
    print("   1. Add PENDING status to SurveyStatus choices")
    print("   2. Update survey_form view to use correct status values")
    print("   3. Update HIS adapter to use correct status")
else:
    print("\n✅ Status values appear correct")
    print("   Issue may be elsewhere (token expiration, wrong token, etc.)")

print("\n" + "="*80)