"""
Contract test for GET /healthcare/patients endpoint.
This test MUST fail before implementation.
"""

import pytest
from django.test import TestCase
from django.urls import reverse
from rest_framework.test import APIClient
from rest_framework import status
import json


class HealthcarePatientsGetContractTest(TestCase):
    def setUp(self):
        self.client = APIClient()
        self.patients_url = '/api/v1/healthcare/patients/'

        # Tenant authentication header
        self.tenant_auth = {'HTTP_AUTHORIZATION': 'Bearer tenant_token'}

    def test_get_patients_success(self):
        """Test successful retrieval of patients list."""
        response = self.client.get(
            self.patients_url,
            **self.tenant_auth
        )

        # This should fail before implementation
        assert response.status_code == status.HTTP_200_OK

        data = response.json()
        assert 'patients' in data
        assert isinstance(data['patients'], list)

        # Check pagination structure
        assert 'pagination' in data
        pagination = data['pagination']
        assert 'page' in pagination
        assert 'limit' in pagination
        assert 'total' in pagination
        assert 'pages' in pagination

    def test_get_patients_unauthorized(self):
        """Test patients list retrieval without authentication."""
        response = self.client.get(self.patients_url)

        assert response.status_code == status.HTTP_401_UNAUTHORIZED

    def test_get_patients_with_pagination(self):
        """Test patients list retrieval with pagination parameters."""
        params = {
            'page': 2,
            'limit': 15
        }

        response = self.client.get(
            self.patients_url,
            data=params,
            **self.tenant_auth
        )

        assert response.status_code == status.HTTP_200_OK

        data = response.json()
        assert data['pagination']['page'] == 2
        assert data['pagination']['limit'] == 15

    def test_get_patients_with_search(self):
        """Test patients list retrieval with search parameter."""
        params = {
            'search': 'tan'
        }

        response = self.client.get(
            self.patients_url,
            data=params,
            **self.tenant_auth
        )

        assert response.status_code == status.HTTP_200_OK

        data = response.json()
        # All returned patients should match search criteria
        for patient in data['patients']:
            search_match = (
                'tan' in patient['name'].lower() or
                'tan' in patient['ic_number'].lower() or
                'tan' in patient['email'].lower()
            )
            assert search_match

    def test_get_patients_filter_by_gender(self):
        """Test patients list retrieval filtered by gender."""
        params = {
            'gender': 'FEMALE'
        }

        response = self.client.get(
            self.patients_url,
            data=params,
            **self.tenant_auth
        )

        assert response.status_code == status.HTTP_200_OK

        data = response.json()
        # All returned patients should have the specified gender
        for patient in data['patients']:
            assert patient['gender'] == 'FEMALE'

    def test_get_patients_filter_by_status(self):
        """Test patients list retrieval filtered by status."""
        params = {
            'status': 'ACTIVE'
        }

        response = self.client.get(
            self.patients_url,
            data=params,
            **self.tenant_auth
        )

        assert response.status_code == status.HTTP_200_OK

        data = response.json()
        # All returned patients should have the specified status
        for patient in data['patients']:
            assert patient['status'] == 'ACTIVE'

    def test_get_patients_filter_by_age_range(self):
        """Test patients list retrieval filtered by age range."""
        params = {
            'min_age': 25,
            'max_age': 65
        }

        response = self.client.get(
            self.patients_url,
            data=params,
            **self.tenant_auth
        )

        assert response.status_code == status.HTTP_200_OK

        data = response.json()
        # All returned patients should be within the age range
        for patient in data['patients']:
            assert 25 <= patient['age'] <= 65

    def test_get_patients_data_structure(self):
        """Test that patient data structure matches the contract."""
        response = self.client.get(
            self.patients_url,
            **self.tenant_auth
        )

        if response.status_code == status.HTTP_200_OK and len(response.json()['patients']) > 0:
            patient = response.json()['patients'][0]

            # Required fields according to contract
            required_fields = [
                'id', 'ic_number', 'name', 'gender', 'date_of_birth',
                'age', 'phone', 'email', 'address', 'blood_type',
                'allergies', 'medications', 'status', 'tenant_id',
                'created_at', 'updated_at'
            ]

            for field in required_fields:
                assert field in patient

            # Field types and enums
            assert isinstance(patient['id'], str)
            assert isinstance(patient['ic_number'], str)
            assert isinstance(patient['name'], str)
            assert patient['gender'] in ['MALE', 'FEMALE', 'OTHER']
            assert isinstance(patient['date_of_birth'], str)
            assert isinstance(patient['age'], int)
            assert isinstance(patient['phone'], str)
            assert isinstance(patient['email'], str)
            assert patient['blood_type'] in ['A+', 'A-', 'B+', 'B-', 'AB+', 'AB-', 'O+', 'O-', 'UNKNOWN']
            assert patient['status'] in ['ACTIVE', 'INACTIVE', 'DECEASED']

    def test_get_patients_with_medical_history(self):
        """Test that patient data includes medical history."""
        response = self.client.get(
            self.patients_url,
            data={'include_medical_history': 'true'},
            **self.tenant_auth
        )

        if response.status_code == status.HTTP_200_OK and len(response.json()['patients']) > 0:
            patient = response.json()['patients'][0]

            # Should include medical history
            assert 'medical_history' in patient
            medical_history = patient['medical_history']

            # Medical history should include relevant fields
            expected_medical_fields = ['conditions', 'surgeries', 'family_history', 'immunizations']
            for field in expected_medical_fields:
                assert field in medical_history

    def test_get_patients_with_emergency_contacts(self):
        """Test that patient data includes emergency contacts."""
        response = self.client.get(
            self.patients_url,
            data={'include_emergency_contacts': 'true'},
            **self.tenant_auth
        )

        if response.status_code == status.HTTP_200_OK and len(response.json()['patients']) > 0:
            patient = response.json()['patients'][0]

            # Should include emergency contacts
            assert 'emergency_contacts' in patient
            emergency_contacts = patient['emergency_contacts']

            # Should be a list
            assert isinstance(emergency_contacts, list)

            if len(emergency_contacts) > 0:
                contact = emergency_contacts[0]
                expected_contact_fields = ['name', 'relationship', 'phone', 'email']
                for field in expected_contact_fields:
                    assert field in contact

    def test_get_patients_with_insurance_info(self):
        """Test that patient data includes insurance information."""
        response = self.client.get(
            self.patients_url,
            data={'include_insurance': 'true'},
            **self.tenant_auth
        )

        if response.status_code == status.HTTP_200_OK and len(response.json()['patients']) > 0:
            patient = response.json()['patients'][0]

            # Should include insurance information
            assert 'insurance' in patient
            insurance = patient['insurance']

            # Insurance should include relevant fields
            expected_insurance_fields = ['provider', 'policy_number', 'coverage_details', 'expiry_date']
            for field in expected_insurance_fields:
                assert field in insurance

    def test_get_patients_sorting(self):
        """Test patients list retrieval with sorting."""
        params = {
            'sort_by': 'name',
            'sort_order': 'asc'
        }

        response = self.client.get(
            self.patients_url,
            data=params,
            **self.tenant_auth
        )

        assert response.status_code == status.HTTP_200_OK

        data = response.json()
        # Patients should be sorted by name in ascending order
        patient_names = [patient['name'] for patient in data['patients']]
        assert patient_names == sorted(patient_names)

    def test_get_patients_tenant_isolation(self):
        """Test that patients are isolated by tenant."""
        response = self.client.get(
            self.patients_url,
            **self.tenant_auth
        )

        if response.status_code == status.HTTP_200_OK:
            data = response.json()
            # All returned patients should belong to the authenticated tenant
            for patient in data['patients']:
                assert 'tenant_id' in patient
                # This will be validated once implementation exists

    def test_get_patients_with_visit_history(self):
        """Test that patient data includes visit history."""
        response = self.client.get(
            self.patients_url,
            data={'include_visits': 'true'},
            **self.tenant_auth
        )

        if response.status_code == status.HTTP_200_OK and len(response.json()['patients']) > 0:
            patient = response.json()['patients'][0]

            # Should include visit history
            assert 'visit_history' in patient
            visit_history = patient['visit_history']

            # Should be a list
            assert isinstance(visit_history, list)

            if len(visit_history) > 0:
                visit = visit_history[0]
                expected_visit_fields = ['date', 'doctor_id', 'diagnosis', 'treatment', 'notes']
                for field in expected_visit_fields:
                    assert field in visit

    def test_get_patients_data_compliance(self):
        """Test that patient data complies with healthcare data protection."""
        response = self.client.get(
            self.patients_url,
            **self.tenant_auth
        )

        if response.status_code == status.HTTP_200_OK and len(response.json()['patients']) > 0:
            patient = response.json()['patients'][0]

            # Sensitive medical data should be properly handled
            # Allergies and medications should be present for healthcare compliance
            assert 'allergies' in patient
            assert 'medications' in patient

            # Address should be structured for privacy compliance
            assert 'address' in patient
            address = patient['address']
            expected_address_fields = ['street', 'city', 'state', 'postal_code', 'country']
            for field in expected_address_fields:
                assert field in address