"""
Tests for structured logging configuration.

Tests logging setup, context management, and FastAPI integration.
"""

import logging
from unittest.mock import patch

import pytest

from src.core.logging_config import (
    add_log_level,
    add_timestamp,
    get_logger,
    get_uvicorn_log_config,
    log_operation,
)


class TestLoggingProcessors:
    """Test logging processor functions."""

    def test_add_timestamp(self):
        """Test timestamp processor adds ISO timestamp."""
        event_dict = {}
        result = add_timestamp(None, "info", event_dict)

        assert "timestamp" in result
        assert isinstance(result["timestamp"], str)
        # Should be ISO 8601 format
        assert "T" in result["timestamp"] or "-" in result["timestamp"]

    def test_add_log_level(self):
        """Test log level processor."""
        event_dict = {}
        result = add_log_level(None, "info", event_dict)

        assert result["level"] == "INFO"

        result = add_log_level(None, "error", {})
        assert result["level"] == "ERROR"


class TestGetLogger:
    """Test logger retrieval."""

    def test_get_logger_returns_bound_logger(self):
        """Test get_logger returns structlog BoundLogger."""
        logger = get_logger("test")
        # Logger should have standard logging methods
        assert hasattr(logger, "info")
        assert hasattr(logger, "debug")
        assert hasattr(logger, "warning")
        assert hasattr(logger, "error")

    def test_get_logger_with_module_name(self):
        """Test logger with module name."""
        logger = get_logger(__name__)
        assert logger is not None

    def test_logger_has_standard_methods(self):
        """Test logger has standard logging methods."""
        logger = get_logger("test")
        assert hasattr(logger, "debug")
        assert hasattr(logger, "info")
        assert hasattr(logger, "warning")
        assert hasattr(logger, "error")
        assert hasattr(logger, "exception")


class TestLogOperation:
    """Test log_operation context manager."""

    @pytest.mark.asyncio
    async def test_log_operation_success(self):
        """Test log_operation for successful operation."""
        get_logger("test")

        async with log_operation("test_operation", {"user_id": "123"}) as ctx:
            # Can update context during operation
            ctx["result_count"] = 5

        # Context should have been updated with success info
        assert ctx["success"] is True
        assert ctx["result_count"] == 5
        assert "duration_seconds" in ctx

    @pytest.mark.asyncio
    async def test_log_operation_failure(self):
        """Test log_operation for failed operation."""
        get_logger("test")

        with pytest.raises(ValueError):
            async with log_operation("test_operation") as ctx:
                raise ValueError("Test error")

        # Context should have failure info
        assert ctx["success"] is False
        assert ctx["error"] == "Test error"
        assert ctx["error_type"] == "ValueError"
        assert "duration_seconds" in ctx

    @pytest.mark.asyncio
    async def test_log_operation_timing(self):
        """Test log_operation records duration."""
        import asyncio

        async with log_operation("test_operation") as ctx:
            await asyncio.sleep(0.01)  # Small delay

        # Should have measurable duration
        assert ctx["duration_seconds"] > 0
        assert ctx["duration_seconds"] < 1.0  # Should be quick

    @pytest.mark.asyncio
    async def test_log_operation_initial_context(self):
        """Test log_operation with initial context."""
        initial = {"request_id": "abc123", "user": "test_user"}

        async with log_operation("test_operation", initial) as ctx:
            pass

        # Initial context should be preserved
        assert ctx["request_id"] == "abc123"
        assert ctx["user"] == "test_user"
        assert ctx["operation"] == "test_operation"


class TestUvicornLogConfig:
    """Test uvicorn logging configuration."""

    def test_get_uvicorn_log_config_returns_dict(self):
        """Test uvicorn config returns valid dict."""
        config = get_uvicorn_log_config()

        assert isinstance(config, dict)
        assert "version" in config
        assert "formatters" in config
        assert "handlers" in config
        assert "loggers" in config

    def test_uvicorn_log_config_has_required_loggers(self):
        """Test config includes uvicorn loggers."""
        config = get_uvicorn_log_config()

        loggers = config["loggers"]
        assert "uvicorn" in loggers
        assert "uvicorn.error" in loggers
        assert "uvicorn.access" in loggers

    def test_uvicorn_log_config_format_selection(self):
        """Test config format changes based on environment."""
        # Just test that the config is valid, format is determined by environment
        config = get_uvicorn_log_config()
        # Should have required structure
        assert "version" in config
        assert "formatters" in config
        assert "handlers" in config
        assert "loggers" in config


class TestLoggingIntegration:
    """Test logging integration with standard library."""

    def test_standard_logging_works(self):
        """Test standard logging.getLogger works."""
        logger = logging.getLogger("test.standard")
        # Should not raise
        logger.info("Test message")

    def test_structlog_and_stdlib_coexist(self):
        """Test structlog and stdlib can coexist."""
        struct_logger = get_logger("test.struct")
        std_logger = logging.getLogger("test.std")

        # Both should work
        struct_logger.info("Structured log")
        std_logger.info("Standard log")

    @pytest.mark.asyncio
    async def test_logging_in_async_context(self):
        """Test logging works in async context."""
        logger = get_logger("test.async")

        async def async_function():
            logger.info("Async log message", task="async_task")

        await async_function()


class TestLoggingOutput:
    """Test actual logging output."""

    def test_logger_outputs_structured_data(self):
        """Test logger can output structured data."""
        logger = get_logger("test.output")

        # Log with structured data
        logger.info(
            "user_action",
            user_id="123",
            action="login",
            success=True,
        )
        # Should not raise, output tested in integration tests

    def test_logger_handles_exceptions(self):
        """Test logger handles exception logging."""
        logger = get_logger("test.exceptions")

        try:
            raise ValueError("Test error")
        except ValueError:
            logger.exception("Error occurred", extra_field="value")
        # Should not raise

    def test_different_log_levels(self):
        """Test different log levels."""
        logger = get_logger("test.levels")

        logger.debug("Debug message", level="debug")
        logger.info("Info message", level="info")
        logger.warning("Warning message", level="warning")
        logger.error("Error message", level="error")
        # Should not raise


class TestLoggingConfiguration:
    """Test logging configuration behavior."""

    def test_logging_respects_environment(self):
        """Test logging format changes with environment."""
        from src.core.config import Environment, config

        # In development, should use console format
        if config.ENVIRONMENT == Environment.DEVELOPMENT:
            assert config.log_format == "console"

        # Mock production environment
        with patch.object(config, "ENVIRONMENT", Environment.PRODUCTION):
            assert config.log_format == "json"

    def test_multiple_loggers_independent(self):
        """Test multiple loggers are independent."""
        logger1 = get_logger("test.logger1")
        logger2 = get_logger("test.logger2")

        assert logger1 is not logger2

        # Both should work independently
        logger1.info("Logger 1 message")
        logger2.info("Logger 2 message")