"""Unit tests for API endpoints with authentication and external job ID support."""
import pytest
import base64
import json
from fastapi.testclient import TestClient
from unittest.mock import Mock, AsyncMock, patch
from fastapi import HTTPException

# Test the authentication logic separately to avoid complex setup
class TestAPIEndpointAuthentication:
    """Test authentication logic for API endpoints."""
    
    def setup_method(self):
        """Set up test fixtures."""
        # Create a valid JWT token for testing
        header = {"alg": "HS256", "typ": "JWT"}
        payload = {"sub": "1234567890", "name": "John Doe", "iat": 1516239022}
        
        header_b64 = base64.urlsafe_b64encode(
            json.dumps(header).encode()
        ).decode().rstrip('=')
        payload_b64 = base64.urlsafe_b64encode(
            json.dumps(payload).encode()
        ).decode().rstrip('=')
        
        self.valid_token = f"{header_b64}.{payload_b64}.test_signature"
        self.valid_auth_header = f"Bearer {self.valid_token}"
    
    def test_extract_endpoint_requires_authentication(self):
        """Test that extract endpoint requires authentication."""
        # Simulate the authentication logic that would happen in the endpoint
        def simulate_extract_auth_check(authorization_header):
            """Simulate the authentication check for extract endpoint."""
            if not authorization_header:
                raise HTTPException(status_code=401, detail="Missing Authorization header")
            
            if not authorization_header.startswith("Bearer "):
                raise HTTPException(status_code=401, detail="Invalid Authorization header format")
            
            return True
        
        # Test successful authentication
        result = simulate_extract_auth_check(self.valid_auth_header)
        assert result is True
        
        # Test missing authentication
        with pytest.raises(HTTPException) as exc_info:
            simulate_extract_auth_check(None)
        assert exc_info.value.status_code == 401
        assert "Missing Authorization header" in str(exc_info.value.detail)
        
        # Test invalid format
        with pytest.raises(HTTPException) as exc_info:
            simulate_extract_auth_check("Basic dXNlcjpwYXNz")
        assert exc_info.value.status_code == 401
        assert "Invalid Authorization header format" in str(exc_info.value.detail)
    
    def test_job_status_endpoint_requires_authentication(self):
        """Test that job status endpoint requires authentication."""
        def simulate_job_status_auth_check(authorization_header):
            """Simulate the authentication check for job status endpoint."""
            if not authorization_header:
                raise HTTPException(status_code=401, detail="Missing Authorization header")
            return True
        
        # Test successful authentication
        result = simulate_job_status_auth_check(self.valid_auth_header)
        assert result is True
        
        # Test missing authentication
        with pytest.raises(HTTPException) as exc_info:
            simulate_job_status_auth_check(None)
        assert exc_info.value.status_code == 401
    
    def test_download_endpoint_requires_authentication(self):
        """Test that download endpoint requires authentication."""
        def simulate_download_auth_check(authorization_header):
            """Simulate the authentication check for download endpoint."""
            if not authorization_header:
                raise HTTPException(status_code=401, detail="Missing Authorization header")
            return True
        
        # Test successful authentication
        result = simulate_download_auth_check(self.valid_auth_header)
        assert result is True
        
        # Test missing authentication
        with pytest.raises(HTTPException) as exc_info:
            simulate_download_auth_check(None)
        assert exc_info.value.status_code == 401
    
    def test_info_endpoint_public(self):
        """Test that info endpoint doesn't require authentication."""
        def simulate_info_endpoint():
            """Simulate the info endpoint (no auth required)."""
            return {
                "version": "1.0.0",
                "supported_video_formats": ['.mp4', '.avi'],
                "supported_audio_formats": ['mp3', 'aac'],
                "quality_levels": ['high', 'medium', 'low']
            }
        
        # Should work without any authentication
        result = simulate_info_endpoint()
        assert "version" in result
        assert result["version"] == "1.0.0"
    
    def test_health_endpoint_public(self):
        """Test that health endpoint doesn't require authentication."""
        def simulate_health_endpoint():
            """Simulate the health endpoint (no auth required)."""
            return {"status": "healthy", "service": "audio-extractor-api"}
        
        # Should work without any authentication
        result = simulate_health_endpoint()
        assert result["status"] == "healthy"
        assert result["service"] == "audio-extractor-api"


class TestExternalJobIdValidation:
    """Test external job ID validation in API endpoints."""
    
    def test_valid_external_job_ids(self):
        """Test validation of valid external job IDs."""
        def validate_external_job_id(job_id):
            """Simulate external job ID validation."""
            if job_id is None or job_id == "":
                return True  # Optional field
            
            if len(job_id) > 50:
                raise HTTPException(status_code=400, detail="External job ID must be 50 characters or less")
            
            import re
            if not re.match(r'^[a-zA-Z0-9_-]+$', job_id):
                raise HTTPException(status_code=400, detail="External job ID must contain only alphanumeric characters, underscores, and hyphens")
            
            return True
        
        # Valid cases
        assert validate_external_job_id(None) is True
        assert validate_external_job_id("") is True
        assert validate_external_job_id("job123") is True
        assert validate_external_job_id("job_123-abc") is True
        assert validate_external_job_id("a" * 50) is True  # Max length
        
        # Invalid cases
        with pytest.raises(HTTPException) as exc_info:
            validate_external_job_id("a" * 51)  # Too long
        assert exc_info.value.status_code == 400
        assert "50 characters or less" in str(exc_info.value.detail)
        
        with pytest.raises(HTTPException) as exc_info:
            validate_external_job_id("job@123")  # Invalid character
        assert exc_info.value.status_code == 400
        assert "alphanumeric characters" in str(exc_info.value.detail)
        
        with pytest.raises(HTTPException) as exc_info:
            validate_external_job_id("job 123")  # Space
        assert exc_info.value.status_code == 400


class TestAPIResponseUpdates:
    """Test that API responses include external job IDs when provided."""
    
    def test_job_creation_response_includes_external_job_id(self):
        """Test that job creation response includes external job ID."""
        # Simulate JobCreationDTO
        from dataclasses import dataclass
        from typing import Optional
        
        @dataclass
        class MockJobCreationDTO:
            job_id: str
            external_job_id: Optional[str] = None
            status: str = "processing"
            message: str = "Job created"
            check_url: str = "/api/v1/jobs/123"
            file_size_mb: float = 10.0
        
        # With external job ID
        dto_with_external = MockJobCreationDTO(
            job_id="internal-123",
            external_job_id="ext-job-456"
        )
        
        assert dto_with_external.job_id == "internal-123"
        assert dto_with_external.external_job_id == "ext-job-456"
        
        # Without external job ID
        dto_without_external = MockJobCreationDTO(
            job_id="internal-789"
        )
        
        assert dto_without_external.job_id == "internal-789"
        assert dto_without_external.external_job_id is None
    
    def test_job_status_response_includes_external_job_id(self):
        """Test that job status response includes external job ID."""
        from dataclasses import dataclass
        from typing import Optional
        from datetime import datetime
        
        @dataclass
        class MockJobStatusDTO:
            job_id: str
            external_job_id: Optional[str] = None
            status: str = "processing"
            created_at: datetime = None
            updated_at: datetime = None
        
        # With external job ID
        now = datetime.utcnow()
        dto_with_external = MockJobStatusDTO(
            job_id="internal-123",
            external_job_id="ext-job-456",
            status="completed",
            created_at=now,
            updated_at=now
        )
        
        assert dto_with_external.job_id == "internal-123"
        assert dto_with_external.external_job_id == "ext-job-456"
        assert dto_with_external.status == "completed"
    
    def test_extract_endpoint_form_parameter_handling(self):
        """Test that extract endpoint handles job_id form parameter correctly."""
        def simulate_extract_form_handling(form_data):
            """Simulate form data handling for extract endpoint."""
            # Extract job_id from form data
            job_id = form_data.get("job_id")
            
            # Validate if provided
            if job_id and job_id != "":
                # Simulate validation
                if len(job_id) > 50:
                    raise HTTPException(status_code=400, detail="External job ID too long")
                
                return {"extracted_job_id": job_id, "valid": True}
            else:
                return {"extracted_job_id": None, "valid": True}
        
        # Test with job_id provided
        form_with_job_id = {"video": "test.mp4", "job_id": "ext-job-123"}
        result = simulate_extract_form_handling(form_with_job_id)
        assert result["extracted_job_id"] == "ext-job-123"
        assert result["valid"] is True
        
        # Test without job_id
        form_without_job_id = {"video": "test.mp4"}
        result = simulate_extract_form_handling(form_without_job_id)
        assert result["extracted_job_id"] is None
        assert result["valid"] is True
        
        # Test with empty job_id
        form_with_empty_job_id = {"video": "test.mp4", "job_id": ""}
        result = simulate_extract_form_handling(form_with_empty_job_id)
        assert result["extracted_job_id"] is None  # Empty string should be treated as None
        assert result["valid"] is True


class TestDuplicateExternalJobIdHandling:
    """Test handling of duplicate external job IDs in API endpoints."""
    
    def test_duplicate_external_job_id_error_handling(self):
        """Test that duplicate external job ID errors are handled properly."""
        from domain.exceptions.domain_exceptions import DuplicateExternalJobIdError
        
        def simulate_job_creation_with_duplicate_check(external_job_id):
            """Simulate job creation with duplicate external ID check."""
            # Simulate existing external job IDs
            existing_external_ids = ["existing-job-1", "existing-job-2"]
            
            if external_job_id in existing_external_ids:
                raise DuplicateExternalJobIdError(external_job_id)
            
            return {"job_id": "new-internal-id", "external_job_id": external_job_id}
        
        # Test successful creation with unique external ID
        result = simulate_job_creation_with_duplicate_check("unique-job-123")
        assert result["external_job_id"] == "unique-job-123"
        
        # Test duplicate external ID error
        with pytest.raises(DuplicateExternalJobIdError) as exc_info:
            simulate_job_creation_with_duplicate_check("existing-job-1")
        
        assert exc_info.value.external_job_id == "existing-job-1"
        assert "already exists" in str(exc_info.value)


class TestEndpointIntegrationLogic:
    """Test the integration logic of endpoints with authentication and external job IDs."""
    
    def test_extract_endpoint_complete_flow(self):
        """Test the complete flow of the extract endpoint."""
        def simulate_complete_extract_flow(auth_header, form_data):
            """Simulate the complete extract endpoint flow."""
            # 1. Authentication check
            if not auth_header or not auth_header.startswith("Bearer "):
                raise HTTPException(status_code=401, detail="Authentication required")
            
            # 2. Extract external job ID
            external_job_id = form_data.get("job_id")
            
            # 3. Validate external job ID format
            if external_job_id and len(external_job_id) > 50:
                raise HTTPException(status_code=400, detail="Invalid external job ID")
            
            # 4. Check for duplicates
            existing_ids = ["existing-1", "existing-2"]
            if external_job_id in existing_ids:
                raise HTTPException(status_code=400, detail="Duplicate external job ID")
            
            # 5. Create job
            internal_job_id = "internal-12345"
            
            # 6. Return response
            return {
                "job_id": internal_job_id,
                "external_job_id": external_job_id,
                "status": "processing",
                "message": "Job created successfully"
            }
        
        # Test successful flow
        auth_header = "Bearer valid.jwt.token"
        form_data = {"video": "test.mp4", "job_id": "my-job-123"}
        
        result = simulate_complete_extract_flow(auth_header, form_data)
        assert result["job_id"] == "internal-12345"
        assert result["external_job_id"] == "my-job-123"
        assert result["status"] == "processing"
        
        # Test without external job ID
        form_data_no_job_id = {"video": "test.mp4"}
        result = simulate_complete_extract_flow(auth_header, form_data_no_job_id)
        assert result["job_id"] == "internal-12345"
        assert result["external_job_id"] is None
    
    def test_job_status_endpoint_complete_flow(self):
        """Test the complete flow of the job status endpoint."""
        def simulate_complete_job_status_flow(auth_header, job_id):
            """Simulate the complete job status endpoint flow."""
            # 1. Authentication check
            if not auth_header or not auth_header.startswith("Bearer "):
                raise HTTPException(status_code=401, detail="Authentication required")
            
            # 2. Look up job
            mock_jobs = {
                "internal-123": {
                    "job_id": "internal-123",
                    "external_job_id": "ext-job-456",
                    "status": "completed",
                    "filename": "test.mp4"
                },
                "internal-789": {
                    "job_id": "internal-789",
                    "external_job_id": None,
                    "status": "processing",
                    "filename": "test2.mp4"
                }
            }
            
            if job_id not in mock_jobs:
                raise HTTPException(status_code=404, detail="Job not found")
            
            # 3. Return job status
            return mock_jobs[job_id]
        
        # Test successful lookup with external job ID
        auth_header = "Bearer valid.jwt.token"
        result = simulate_complete_job_status_flow(auth_header, "internal-123")
        assert result["job_id"] == "internal-123"
        assert result["external_job_id"] == "ext-job-456"
        assert result["status"] == "completed"
        
        # Test successful lookup without external job ID
        result = simulate_complete_job_status_flow(auth_header, "internal-789")
        assert result["job_id"] == "internal-789"
        assert result["external_job_id"] is None
        assert result["status"] == "processing"
        
        # Test job not found
        with pytest.raises(HTTPException) as exc_info:
            simulate_complete_job_status_flow(auth_header, "non-existent")
        assert exc_info.value.status_code == 404
        assert "Job not found" in str(exc_info.value.detail)