"""
Unit tests for common.exceptions module

Tests all custom exception classes and their attributes.
"""

import pytest
from common import (
    MedicalTranscriberException,
    AudioFileException,
    TranscriptionException,
    CorrectionException,
    ReportGenerationException,
    ConfigurationException,
    APIException,
    ValidationException,
    KnowledgeBaseException
)


class TestMedicalTranscriberException:
    """Test cases for base MedicalTranscriberException"""
    
    def test_is_exception(self):
        """Should be an Exception subclass"""
        exc = MedicalTranscriberException("Test error")
        assert isinstance(exc, Exception)
    
    def test_with_message(self):
        """Should accept message"""
        msg = "Test error message"
        exc = MedicalTranscriberException(msg)
        assert str(exc) == msg
    
    def test_inheritance(self):
        """All specific exceptions should inherit from base"""
        exceptions = [
            AudioFileException("path", "message"),
            TranscriptionException("message"),
            CorrectionException("message"),
            ReportGenerationException("message"),
            ConfigurationException("message"),
            APIException("endpoint", 404, "message"),
            ValidationException("field", "value", "message"),
            KnowledgeBaseException("message")
        ]
        
        for exc in exceptions:
            assert isinstance(exc, MedicalTranscriberException)


class TestAudioFileException:
    """Test cases for AudioFileException"""
    
    def test_with_default_message(self):
        """Should use default message if not provided"""
        exc = AudioFileException("/path/to/file.wav")
        assert "/path/to/file.wav" in str(exc)
        assert "Invalid audio file" in str(exc)
    
    def test_with_custom_message(self):
        """Should use custom message if provided"""
        exc = AudioFileException("/path/to/file.wav", "File is corrupted")
        assert "File is corrupted" in str(exc)
        assert "/path/to/file.wav" in str(exc)
    
    def test_file_path_attribute(self):
        """Should have file_path attribute"""
        file_path = "/path/to/file.wav"
        exc = AudioFileException(file_path, "Test")
        assert exc.file_path == file_path
    
    def test_message_attribute(self):
        """Should have message attribute"""
        exc = AudioFileException("/path/to/file.wav", "Test message")
        assert "Test message" in exc.message


class TestTranscriptionException:
    """Test cases for TranscriptionException"""
    
    def test_basic_usage(self):
        """Should work with simple message"""
        exc = TranscriptionException("Transcription failed")
        assert "Transcription failed" in str(exc)
    
    def test_inheritance_chain(self):
        """Should be MedicalTranscriberException"""
        exc = TranscriptionException("Test")
        assert isinstance(exc, MedicalTranscriberException)


class TestCorrectionException:
    """Test cases for CorrectionException"""
    
    def test_basic_usage(self):
        """Should work with simple message"""
        exc = CorrectionException("LLM correction failed")
        assert "LLM correction failed" in str(exc)
    
    def test_inheritance_chain(self):
        """Should be MedicalTranscriberException"""
        exc = CorrectionException("Test")
        assert isinstance(exc, MedicalTranscriberException)


class TestReportGenerationException:
    """Test cases for ReportGenerationException"""
    
    def test_basic_usage(self):
        """Should work with simple message"""
        exc = ReportGenerationException("Report generation failed")
        assert "Report generation failed" in str(exc)
    
    def test_inheritance_chain(self):
        """Should be MedicalTranscriberException"""
        exc = ReportGenerationException("Test")
        assert isinstance(exc, MedicalTranscriberException)


class TestConfigurationException:
    """Test cases for ConfigurationException"""
    
    def test_basic_usage(self):
        """Should work with simple message"""
        exc = ConfigurationException("Invalid configuration")
        assert "Invalid configuration" in str(exc)
    
    def test_inheritance_chain(self):
        """Should be MedicalTranscriberException"""
        exc = ConfigurationException("Test")
        assert isinstance(exc, MedicalTranscriberException)


class TestAPIException:
    """Test cases for APIException with status codes"""
    
    def test_with_status_code_and_message(self):
        """Should capture endpoint, status code, and message"""
        exc = APIException("https://api.example.com/v1/chat", 429, "Rate limit exceeded")
        
        assert exc.endpoint == "https://api.example.com/v1/chat"
        assert exc.status_code == 429
        assert "429" in str(exc)
        assert "Rate limit" in str(exc)
    
    def test_error_400(self):
        """Should handle 400 Bad Request"""
        exc = APIException("api/endpoint", 400, "Bad request format")
        assert exc.status_code == 400
        assert "400" in str(exc)
    
    def test_error_401(self):
        """Should handle 401 Unauthorized"""
        exc = APIException("api/endpoint", 401, "Invalid API key")
        assert exc.status_code == 401
        assert "401" in str(exc)
        assert "Invalid API key" in str(exc)
    
    def test_error_429(self):
        """Should handle 429 Rate Limit"""
        exc = APIException("api/endpoint", 429, "Rate limit exceeded")
        assert exc.status_code == 429
        assert "429" in str(exc)
    
    def test_error_500(self):
        """Should handle 500 Internal Server Error"""
        exc = APIException("api/endpoint", 500, "Server error")
        assert exc.status_code == 500
        assert "500" in str(exc)
    
    def test_message_attribute(self):
        """Should have message attribute with full context"""
        exc = APIException("api/endpoint", 404, "Not found")
        assert "404" in exc.message
        assert "api/endpoint" in exc.message
    
    def test_inheritance_chain(self):
        """Should be MedicalTranscriberException"""
        exc = APIException("api", 500, "error")
        assert isinstance(exc, MedicalTranscriberException)


class TestValidationException:
    """Test cases for ValidationException with field context"""
    
    def test_with_field_name(self):
        """Should capture field name"""
        exc = ValidationException("email", "invalid@", "Invalid email format")
        
        assert exc.field == "email"
        assert exc.value == "invalid@"
        assert "email" in str(exc)
    
    def test_default_reason(self):
        """Should use default reason if not provided"""
        exc = ValidationException("username", "ab", "")
        assert "Invalid value" in str(exc)
    
    def test_custom_reason(self):
        """Should use custom reason"""
        exc = ValidationException("age", "-5", "Age must be positive")
        assert "Age must be positive" in str(exc)
    
    def test_audio_file_field(self):
        """Should work with audio_file field"""
        exc = ValidationException("audio_file", "test.xyz", "Unsupported format")
        assert "audio_file" in str(exc)
        assert "test.xyz" in str(exc)
    
    def test_api_key_field(self):
        """Should work with api_key field"""
        exc = ValidationException("api_key", "***", "API key is too short")
        assert "api_key" in str(exc)
    
    def test_inheritance_chain(self):
        """Should be MedicalTranscriberException"""
        exc = ValidationException("field", "value", "reason")
        assert isinstance(exc, MedicalTranscriberException)


class TestKnowledgeBaseException:
    """Test cases for KnowledgeBaseException"""
    
    def test_basic_usage(self):
        """Should work with simple message"""
        exc = KnowledgeBaseException("Knowledge base not found")
        assert "Knowledge base not found" in str(exc)
    
    def test_inheritance_chain(self):
        """Should be MedicalTranscriberException"""
        exc = KnowledgeBaseException("Test")
        assert isinstance(exc, MedicalTranscriberException)


class TestExceptionHandling:
    """Integration tests for exception handling"""
    
    def test_catch_api_exception_by_status_code(self):
        """Should be able to catch and handle by status code"""
        exc = APIException("api/chat", 429, "Rate limit")
        
        try:
            raise exc
        except APIException as e:
            if e.status_code == 429:
                assert True
            else:
                assert False
    
    def test_catch_specific_exceptions(self):
        """Should be able to catch specific exception types"""
        exceptions_to_test = [
            (AudioFileException("/path", "test"), AudioFileException),
            (TranscriptionException("test"), TranscriptionException),
            (CorrectionException("test"), CorrectionException),
            (APIException("api", 500, "error"), APIException),
            (ValidationException("field", "value", "reason"), ValidationException),
        ]
        
        for exc, exc_type in exceptions_to_test:
            try:
                raise exc
            except exc_type:
                assert True
            except Exception:
                assert False
    
    def test_catch_all_as_medical_transcriber_exception(self):
        """Should be able to catch all as base exception"""
        exceptions = [
            AudioFileException("/path", "test"),
            TranscriptionException("test"),
            CorrectionException("test"),
            APIException("api", 500, "error"),
            ValidationException("field", "value", "reason"),
            KnowledgeBaseException("test"),
        ]
        
        for exc in exceptions:
            try:
                raise exc
            except MedicalTranscriberException:
                assert True
            except Exception:
                assert False
    
    def test_exception_chain_preservation(self):
        """Should preserve exception chain"""
        try:
            try:
                raise ValueError("Original error")
            except ValueError as e:
                raise AudioFileException("/path", str(e)) from e
        except AudioFileException as e:
            assert str(e.file_path) == "/path"
    
    def test_multiple_exception_handlers(self):
        """Should work with multiple exception handlers"""
        def test_api_error():
            raise APIException("api", 429, "Rate limited")
        
        def test_validation_error():
            raise ValidationException("field", "value", "Invalid")
        
        try:
            test_api_error()
        except APIException as e:
            assert e.status_code == 429
        except Exception:
            assert False
        
        try:
            test_validation_error()
        except ValidationException as e:
            assert e.field == "field"
        except Exception:
            assert False


class TestExceptionStringRepresentation:
    """Test string representations of exceptions"""
    
    def test_audio_file_exception_string(self):
        """Should have informative string representation"""
        exc = AudioFileException("/path/to/audio.wav", "Corrupted file")
        exc_str = str(exc)
        
        assert "Corrupted file" in exc_str
        assert "/path/to/audio.wav" in exc_str
    
    def test_api_exception_string(self):
        """Should have informative string representation"""
        exc = APIException("api/v1/chat", 401, "Unauthorized")
        exc_str = str(exc)
        
        assert "401" in exc_str
        assert "api/v1/chat" in exc_str
        assert "Unauthorized" in exc_str
    
    def test_validation_exception_string(self):
        """Should have informative string representation"""
        exc = ValidationException("username", "admin", "Username reserved")
        exc_str = str(exc)
        
        assert "username" in exc_str
        assert "admin" in exc_str
        assert "Username reserved" in exc_str