// SPDX-FileCopyrightText: 2026 FocusFlow contributors
// SPDX-License-Identifier: AGPL-3.0-only

/// Tests FocusFlow runtime config and file logging behavior.
library;

import 'dart:convert';
import 'dart:io';

import 'package:flutter_test/flutter_test.dart';
import 'package:focus_flow_flutter/app/runtime/focus_flow_file_logger.dart';
import 'package:focus_flow_flutter/app/runtime/focus_flow_runtime_config.dart';
import 'package:scheduler_core/scheduler_core.dart' as scheduler_core;

/// Runs runtime config tests.
void main() {
  tearDown(scheduler_core.logger.disable);

  group('FocusFlowRuntimeConfig', () {
    test('missing config file leaves optional settings unset', () async {
      final directory = await Directory.systemTemp.createTemp(
        'focus-flow-config-test-',
      );
      addTearDown(() => directory.delete(recursive: true));

      final config = await FocusFlowRuntimeConfig.load(
        path: '${directory.path}${Platform.pathSeparator}missing.json',
      );

      expect(config.logLevel, isNull);
      expect(config.logFileLocation, isNull);
      expect(config.enablesFileLogging, isFalse);
    });

    test('loads supported settings from a config file', () async {
      final directory = await Directory.systemTemp.createTemp(
        'focus-flow-config-file-test-',
      );
      addTearDown(() => directory.delete(recursive: true));
      final configFile = File(
        '${directory.path}${Platform.pathSeparator}config.json',
      );
      await configFile.writeAsString(
        jsonEncode({'LogLevel': 'finest', 'LogfileLocation': directory.path}),
      );

      final config = await FocusFlowRuntimeConfig.load(path: configFile.path);

      expect(config.logLevel, FocusFlowLogLevel.finest);
      expect(config.logFileLocation, directory.path);
      expect(config.enablesFileLogging, isTrue);
    });

    test('parses every supported log level', () {
      expect(FocusFlowLogLevel.tryParse('finest'), FocusFlowLogLevel.finest);
      expect(FocusFlowLogLevel.tryParse('finer'), FocusFlowLogLevel.finer);
      expect(FocusFlowLogLevel.tryParse('fine'), FocusFlowLogLevel.fine);
      expect(FocusFlowLogLevel.tryParse('debug'), FocusFlowLogLevel.debug);
      expect(FocusFlowLogLevel.tryParse('info'), FocusFlowLogLevel.info);
      expect(FocusFlowLogLevel.tryParse('warn'), FocusFlowLogLevel.warn);
      expect(FocusFlowLogLevel.tryParse('error'), FocusFlowLogLevel.error);
    });

    test('loads supported logging settings from JSON', () {
      final config = FocusFlowRuntimeConfig.fromJson({
        'LogLevel': 'debug',
        'LogfileLocation': '/tmp/focus-flow-logs',
      });

      expect(config.logLevel, FocusFlowLogLevel.debug);
      expect(config.logFileLocation, '/tmp/focus-flow-logs');
      expect(config.enablesFileLogging, isTrue);
    });

    test('ignores missing and unsupported optional settings', () {
      final config = FocusFlowRuntimeConfig.fromJson({
        'LogLevel': 'verbose',
        'LogfileLocation': '   ',
      });

      expect(config.logLevel, isNull);
      expect(config.logFileLocation, isNull);
      expect(config.enablesFileLogging, isFalse);
    });
  });

  group('FocusFlowFileLogger', () {
    test('does nothing unless both logging settings are set', () async {
      final logger = await FocusFlowFileLogger.open(
        const FocusFlowRuntimeConfig(logLevel: FocusFlowLogLevel.debug),
      );

      expect(logger.isEnabled, isFalse);
      await logger.info('ignored');
    });

    test('writes messages at or above the configured level', () async {
      final directory = await Directory.systemTemp.createTemp(
        'focus-flow-log-test-',
      );
      addTearDown(() => directory.delete(recursive: true));
      final logger = await FocusFlowFileLogger.open(
        FocusFlowRuntimeConfig(
          logLevel: FocusFlowLogLevel.warn,
          logFileLocation: directory.path,
        ),
        now: () => DateTime.utc(2026, 7, 3, 12),
      );

      await logger.info('not written');
      await logger.warn('written warning');
      await logger.error('written error', error: 'boom');

      final logFile = File(
        '${directory.path}${Platform.pathSeparator}focus_flow.log',
      );
      final contents = await logFile.readAsString();
      expect(contents, isNot(contains('not written')));
      expect(contents, contains('2026-07-03T12:00:00.000Z WARN'));
      expect(contents, contains('written warning'));
      expect(contents, contains('ERROR written error | error=boom'));
    });

    test('skips lazy message work below the configured level', () async {
      final directory = await Directory.systemTemp.createTemp(
        'focus-flow-lazy-skip-test-',
      );
      addTearDown(() => directory.delete(recursive: true));
      final logger = await FocusFlowFileLogger.open(
        FocusFlowRuntimeConfig(
          logLevel: FocusFlowLogLevel.info,
          logFileLocation: directory.path,
        ),
      );
      var evaluated = false;

      await logger.debug(() {
        evaluated = true;
        return 'expensive debug state';
      });

      expect(evaluated, isFalse);
      expect(
        File(
          '${directory.path}${Platform.pathSeparator}focus_flow.log',
        ).existsSync(),
        isFalse,
      );
    });

    test('evaluates lazy messages once the level is enabled', () async {
      final directory = await Directory.systemTemp.createTemp(
        'focus-flow-lazy-write-test-',
      );
      addTearDown(() => directory.delete(recursive: true));
      final logger = await FocusFlowFileLogger.open(
        FocusFlowRuntimeConfig(
          logLevel: FocusFlowLogLevel.debug,
          logFileLocation: directory.path,
        ),
        now: () => DateTime.utc(2026, 7, 3, 12),
      );
      var evaluations = 0;

      await logger.debug(() {
        evaluations += 1;
        return 'computed debug state';
      });

      expect(evaluations, 1);
      final contents = await File(
        '${directory.path}${Platform.pathSeparator}focus_flow.log',
      ).readAsString();
      expect(contents, contains('DEBUG computed debug state'));
    });

    test(
      'finest captures caller information for every written level',
      () async {
        final directory = await Directory.systemTemp.createTemp(
          'focus-flow-finest-caller-test-',
        );
        addTearDown(() => directory.delete(recursive: true));
        final logger = await FocusFlowFileLogger.open(
          FocusFlowRuntimeConfig(
            logLevel: FocusFlowLogLevel.finest,
            logFileLocation: directory.path,
          ),
          now: () => DateTime.utc(2026, 7, 3, 12),
        );

        await logger.info('high level message');

        final contents = await File(
          '${directory.path}${Platform.pathSeparator}focus_flow.log',
        ).readAsString();
        expect(contents, contains('INFO caller='));
        expect(contents, contains('runtime_config_test.dart'));
        expect(contents, contains('high level message'));
      },
    );

    test('fine captures caller information for warnings and errors', () async {
      final directory = await Directory.systemTemp.createTemp(
        'focus-flow-fine-caller-test-',
      );
      addTearDown(() => directory.delete(recursive: true));
      final logger = await FocusFlowFileLogger.open(
        FocusFlowRuntimeConfig(
          logLevel: FocusFlowLogLevel.fine,
          logFileLocation: directory.path,
        ),
        now: () => DateTime.utc(2026, 7, 3, 12),
      );

      await logger.warn('handled warning');

      final contents = await File(
        '${directory.path}${Platform.pathSeparator}focus_flow.log',
      ).readAsString();
      expect(contents, contains('WARN caller='));
      expect(contents, contains('runtime_config_test.dart'));
      expect(contents, contains('handled warning'));
    });

    test('info does not capture caller information for warnings', () async {
      final directory = await Directory.systemTemp.createTemp(
        'focus-flow-info-caller-test-',
      );
      addTearDown(() => directory.delete(recursive: true));
      final logger = await FocusFlowFileLogger.open(
        FocusFlowRuntimeConfig(
          logLevel: FocusFlowLogLevel.info,
          logFileLocation: directory.path,
        ),
        now: () => DateTime.utc(2026, 7, 3, 12),
      );

      await logger.warn('minimal warning');

      final contents = await File(
        '${directory.path}${Platform.pathSeparator}focus_flow.log',
      ).readAsString();
      expect(contents, contains('WARN minimal warning'));
      expect(contents, isNot(contains('caller=')));
      expect(contents, isNot(contains('runtime_config_test.dart')));
    });
  });
}