"""Test runner for orchestrating DVT test execution.

This module provides the TestRunner class, which coordinates test execution,
manages test lifecycle, and ensures proper logging and error handling.
"""

import json
import traceback
from typing import Any
from uuid import UUID

from py_dvt_ate.data.models import TestStatus
from py_dvt_ate.data.repository import ITestRepository
from py_dvt_ate.framework.context import ITest, TestContext
from py_dvt_ate.framework.limits import evaluate_results
from py_dvt_ate.framework.logger import TestLogger
from py_dvt_ate.instruments.factory import InstrumentSet


class TestRunner:
    """Orchestrates DVT test execution.

    The test runner manages the complete test lifecycle:
    1. Creates a test run record in the repository
    2. Sets up logging and context
    3. Executes the test with proper error handling
    4. Evaluates results against limits
    5. Updates final status and flushes data

    Attributes:
        repository: Data repository for persisting test results.

    Example:
        runner = TestRunner(repository)
        instruments = factory.create(config)
        run_id = runner.run_test(
            test=TempCoTest(),
            instruments=instruments,
            config={"temp_points": [-40, 25, 85]},
            operator="alice@example.com"
        )
    """

    def __init__(self, repository: ITestRepository):
        """Initialise test runner.

        Args:
            repository: Repository for persisting test data.
        """
        self.repository = repository

    def run_test(
        self,
        test: ITest,
        instruments: InstrumentSet,
        config: dict[str, Any] | None = None,
        operator: str | None = None,
        description: str | None = None,
    ) -> UUID:
        """Run a DVT test with full lifecycle management.

        Creates a test run, executes the test with proper error handling,
        evaluates results, and updates final status. All measurements and
        results are persisted to the repository.

        Args:
            test: Test instance to execute (implements ITest).
            instruments: Instrument set for test to use.
            config: Optional test-specific configuration dictionary.
            operator: Optional operator identifier (e.g., email address).
            description: Optional human-readable test run description.

        Returns:
            UUID of the test run. Can be used to retrieve results later.

        Raises:
            Exception: Only if repository operations fail. Test execution
                      errors are caught and recorded as ERROR status.

        Example:
            run_id = runner.run_test(
                test=TempCoTest(),
                instruments=instruments,
                config={"temp_points": [-40, 25, 85]},
                operator="alice@example.com",
                description="Characterisation run #42"
            )
            print(f"Test run ID: {run_id}")
        """
        config = config or {}

        # Create test run record
        run_id = self.repository.create_run(
            test_name=test.name,
            config=config,
            operator=operator,
            description=description or test.description,
        )

        # Create logger for this run
        logger = TestLogger(run_id=run_id, repository=self.repository)

        # Create test context
        context = TestContext(
            run_id=run_id,
            instruments=instruments,
            logger=logger,
            config=config,
        )

        # Update status to running
        self.repository.update_run_status(run_id, TestStatus.RUNNING)

        # Execute test with error handling
        try:
            logger.log_event(f"Starting test: {test.name}", level="INFO")
            logger.log_event(f"Description: {test.description}", level="INFO")

            # Log configuration
            if config:
                config_str = json.dumps(config, indent=2)
                logger.log_event(f"Configuration:\n{config_str}", level="DEBUG")

            # Execute the test
            status = test.execute(context)

            # Flush any buffered measurements
            logger.flush()

            # Evaluate results if test didn't explicitly set status
            if status == TestStatus.RUNNING:
                results = self.repository.get_results(run_id)
                status = evaluate_results(results)
                logger.log_event(
                    f"Test completed. Evaluated {len(results)} results: {status.value}",
                    level="INFO",
                )

            # Update final status
            self.repository.complete_run(run_id, status)
            logger.log_event(f"Test finished with status: {status.value}", level="INFO")

        except KeyboardInterrupt:
            # User interrupted - mark as error but don't swallow interrupt
            logger.log_event("Test interrupted by user", level="WARNING")
            logger.flush()
            self.repository.complete_run(run_id, TestStatus.ERROR)
            raise

        except Exception as e:
            # Test execution error - log and mark as ERROR
            error_msg = f"Test execution failed: {e}"
            logger.log_event(error_msg, level="ERROR")
            logger.log_event(traceback.format_exc(), level="DEBUG")
            logger.flush()
            self.repository.complete_run(run_id, TestStatus.ERROR)
            logger.log_event("Test finished with status: ERROR", level="INFO")

        return run_id

    def run_tests(
        self,
        tests: list[ITest],
        instruments: InstrumentSet,
        config: dict[str, Any] | None = None,
        operator: str | None = None,
    ) -> list[UUID]:
        """Run multiple tests sequentially.

        Convenience method for running a suite of tests. Each test is run
        independently with its own test run record. If one test fails, the
        remaining tests still execute.

        Args:
            tests: List of test instances to execute.
            instruments: Instrument set shared by all tests.
            config: Optional configuration applied to all tests.
            operator: Optional operator identifier.

        Returns:
            List of test run UUIDs in execution order.

        Example:
            run_ids = runner.run_tests(
                tests=[TempCoTest(), LoadRegTest(), LineRegTest()],
                instruments=instruments,
                config={"common_setting": 42},
                operator="alice@example.com"
            )
            for run_id in run_ids:
                run = repository.get_run(run_id)
                print(f"{run.test_name}: {run.status.value}")
        """
        run_ids = []
        for test in tests:
            run_id = self.run_test(
                test=test,
                instruments=instruments,
                config=config,
                operator=operator,
            )
            run_ids.append(run_id)
        return run_ids