#!/usr/bin/env python3
"""
Additional tests for LogManager covering uncovered paths:
- get_service_logs_parsed (JSON + non-JSON lines, level filtering)
- search_logs (time_range filter, level filter, non-JSON lines)
- _matches_search_criteria (query/time_range/level checks)
- _is_log_level (JSON and text fallback)
- export_logs (json/csv/text/unknown format)
- _logs_to_csv / _logs_to_text
- get_log_statistics (single service and all services)
- get_log_file_info (missing file → error key)
- set_service_level (known and unknown service)
- get_service_levels
- get_all_log_file_infos (active + rotated files)
- compress_old_logs
- stop
- _start_rotation_monitor creates a running thread
"""

import sys
import os
import json
import gzip
import shutil
import tempfile
import time
import unittest
from datetime import datetime, timedelta
from pathlib import Path

api_dir = Path(__file__).parent.parent / 'api'
sys.path.insert(0, str(api_dir))

from log_manager import LogManager


def _lm(tmp):
    log_dir = os.path.join(tmp, 'logs')
    os.makedirs(log_dir, exist_ok=True)
    return LogManager(log_dir=log_dir)


def _write_log_file(log_dir, service, entries):
    """Write JSON log entries to a service log file."""
    path = os.path.join(log_dir, f'{service}.log')
    with open(path, 'w') as f:
        for e in entries:
            f.write(json.dumps(e) + '\n')
    return path


class TestGetServiceLogsParsed(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.mkdtemp()
        self.lm = _lm(self.tmp)

    def tearDown(self):
        self.lm.stop()
        shutil.rmtree(self.tmp)

    def test_missing_log_file_returns_error_entry(self):
        result = self.lm.get_service_logs_parsed('nosuchservice')
        self.assertEqual(len(result), 1)
        self.assertIn('error', result[0])

    def test_returns_parsed_json_entries(self):
        _write_log_file(self.lm.log_dir, 'svc', [
            {'timestamp': '2026-01-01T00:00:00', 'level': 'INFO', 'message': 'ok'},
            {'timestamp': '2026-01-01T00:00:01', 'level': 'ERROR', 'message': 'fail'},
        ])
        result = self.lm.get_service_logs_parsed('svc', level='ALL', lines=10)
        self.assertEqual(len(result), 2)
        levels = {e['level'] for e in result}
        self.assertIn('INFO', levels)
        self.assertIn('ERROR', levels)

    def test_level_filter_excludes_non_matching(self):
        _write_log_file(self.lm.log_dir, 'svc', [
            {'timestamp': '2026-01-01T00:00:00', 'level': 'INFO', 'message': 'ok'},
            {'timestamp': '2026-01-01T00:00:01', 'level': 'ERROR', 'message': 'fail'},
        ])
        result = self.lm.get_service_logs_parsed('svc', level='ERROR', lines=10)
        self.assertTrue(all(e.get('level') == 'ERROR' for e in result))

    def test_non_json_lines_are_included_for_all_level(self):
        path = os.path.join(self.lm.log_dir, 'svc.log')
        with open(path, 'w') as f:
            f.write('plain text log line\n')
        result = self.lm.get_service_logs_parsed('svc', level='ALL', lines=10)
        self.assertEqual(len(result), 1)
        self.assertIn('raw_line', result[0])


class TestSearchLogs(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.mkdtemp()
        self.lm = _lm(self.tmp)

    def tearDown(self):
        self.lm.stop()
        shutil.rmtree(self.tmp)

    def test_search_finds_matching_message(self):
        _write_log_file(self.lm.log_dir, 'svc', [
            {'timestamp': '2026-01-01T00:00:00', 'level': 'INFO', 'message': 'user login ok'},
            {'timestamp': '2026-01-01T00:00:01', 'level': 'INFO', 'message': 'disk full'},
        ])
        self.lm.service_loggers['svc'] = type('', (), {})()  # register so search includes it
        results = self.lm.search_logs('login', services=['svc'])
        self.assertEqual(len(results), 1)
        self.assertIn('login', results[0]['message'])

    def test_search_level_filter(self):
        _write_log_file(self.lm.log_dir, 'svc', [
            {'timestamp': '2026-01-01T00:00:00', 'level': 'INFO', 'message': 'info msg'},
            {'timestamp': '2026-01-01T00:00:01', 'level': 'ERROR', 'message': 'error msg'},
        ])
        results = self.lm.search_logs('', services=['svc'], level='ERROR')
        self.assertTrue(all(e.get('level') == 'ERROR' for e in results))

    def test_search_time_range_filter(self):
        early = '2026-01-01T10:00:00'
        late = '2026-01-01T14:00:00'
        _write_log_file(self.lm.log_dir, 'svc', [
            {'timestamp': early, 'level': 'INFO', 'message': 'early'},
            {'timestamp': late, 'level': 'INFO', 'message': 'late'},
        ])
        # Register logger so search_logs finds the service
        self.lm.add_service_logger('svc', {'level': 'INFO'})
        start = datetime(2026, 1, 1, 11, 0, 0)
        end = datetime(2026, 1, 1, 13, 0, 0)
        results = self.lm.search_logs('', services=['svc'], time_range=(start, end))
        msgs = [r.get('message', '') for r in results]
        # 'early' is within 11:00-13:00 range, 'late' at 14:00 should be excluded
        self.assertNotIn('late', msgs)

    def test_non_json_lines_matched_by_query(self):
        path = os.path.join(self.lm.log_dir, 'svc.log')
        with open(path, 'w') as f:
            f.write('this line contains keyterm\n')
            f.write('unrelated line\n')
        results = self.lm.search_logs('keyterm', services=['svc'])
        self.assertEqual(len(results), 1)
        self.assertIn('keyterm', results[0]['raw_line'])

    def test_search_no_services_returns_empty(self):
        results = self.lm.search_logs('anything', services=[])
        self.assertEqual(results, [])


class TestMatchesSearchCriteria(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.mkdtemp()
        self.lm = _lm(self.tmp)

    def tearDown(self):
        self.lm.stop()
        shutil.rmtree(self.tmp)

    def test_query_match(self):
        entry = {'message': 'hello world', 'level': 'INFO'}
        self.assertTrue(self.lm._matches_search_criteria(entry, 'hello', None, None))

    def test_query_no_match(self):
        entry = {'message': 'hello world', 'level': 'INFO'}
        self.assertFalse(self.lm._matches_search_criteria(entry, 'nothere', None, None))

    def test_level_filter_match(self):
        entry = {'message': 'msg', 'level': 'ERROR'}
        self.assertTrue(self.lm._matches_search_criteria(entry, '', None, 'ERROR'))

    def test_level_filter_no_match(self):
        entry = {'message': 'msg', 'level': 'INFO'}
        self.assertFalse(self.lm._matches_search_criteria(entry, '', None, 'ERROR'))

    def test_time_range_within(self):
        entry = {'message': 'msg', 'level': 'INFO', 'timestamp': '2026-06-01T12:00:00'}
        start = datetime(2026, 6, 1, 11, 0)
        end = datetime(2026, 6, 1, 13, 0)
        self.assertTrue(self.lm._matches_search_criteria(entry, '', (start, end), None))

    def test_time_range_outside(self):
        entry = {'message': 'msg', 'level': 'INFO', 'timestamp': '2026-06-01T14:00:00'}
        start = datetime(2026, 6, 1, 11, 0)
        end = datetime(2026, 6, 1, 13, 0)
        self.assertFalse(self.lm._matches_search_criteria(entry, '', (start, end), None))

    def test_time_range_invalid_timestamp_excluded(self):
        entry = {'message': 'msg', 'level': 'INFO', 'timestamp': 'not-a-date'}
        start = datetime(2026, 6, 1, 11, 0)
        end = datetime(2026, 6, 1, 13, 0)
        self.assertFalse(self.lm._matches_search_criteria(entry, '', (start, end), None))


class TestIsLogLevel(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.mkdtemp()
        self.lm = _lm(self.tmp)

    def tearDown(self):
        self.lm.stop()
        shutil.rmtree(self.tmp)

    def test_json_line_matches_level(self):
        line = json.dumps({'level': 'ERROR', 'message': 'oops'})
        self.assertTrue(self.lm._is_log_level(line, 'ERROR'))

    def test_json_line_no_match(self):
        line = json.dumps({'level': 'INFO', 'message': 'ok'})
        self.assertFalse(self.lm._is_log_level(line, 'ERROR'))

    def test_text_line_fallback_match(self):
        line = '2026-01-01 ERROR something went wrong'
        self.assertTrue(self.lm._is_log_level(line, 'ERROR'))

    def test_text_line_fallback_no_match(self):
        line = '2026-01-01 INFO something went fine'
        self.assertFalse(self.lm._is_log_level(line, 'ERROR'))


class TestExportLogs(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.mkdtemp()
        self.lm = _lm(self.tmp)

    def tearDown(self):
        self.lm.stop()
        shutil.rmtree(self.tmp)

    def test_export_json_format(self):
        _write_log_file(self.lm.log_dir, 'svc', [
            {'timestamp': '2026-01-01T00:00:00', 'level': 'INFO', 'message': 'hi'},
        ])
        result = self.lm.export_logs('json', filters={'services': ['svc']})
        parsed = json.loads(result)
        self.assertIsInstance(parsed, list)

    def test_export_csv_format(self):
        _write_log_file(self.lm.log_dir, 'svc', [
            {'timestamp': '2026-01-01T00:00:00', 'level': 'INFO', 'message': 'hi'},
        ])
        result = self.lm.export_logs('csv', filters={'services': ['svc']})
        self.assertIsInstance(result, str)

    def test_export_text_format(self):
        _write_log_file(self.lm.log_dir, 'svc', [
            {'timestamp': '2026-01-01T00:00:00', 'level': 'INFO', 'message': 'hi'},
        ])
        result = self.lm.export_logs('text', filters={'services': ['svc']})
        self.assertIsInstance(result, str)

    def test_export_unknown_format_raises(self):
        with self.assertRaises(ValueError):
            self.lm.export_logs('pdf')

    def test_logs_to_csv_empty_returns_empty_string(self):
        result = self.lm._logs_to_csv([])
        self.assertEqual(result, '')

    def test_logs_to_csv_has_header(self):
        logs = [{'level': 'INFO', 'message': 'hi', 'timestamp': '2026-01-01T00:00:00'}]
        csv = self.lm._logs_to_csv(logs)
        lines = csv.split('\n')
        self.assertGreater(len(lines), 1)
        header_fields = set(lines[0].split(','))
        self.assertIn('level', header_fields)
        self.assertIn('message', header_fields)

    def test_logs_to_text_formats_entries(self):
        logs = [{'level': 'ERROR', 'service': 'svc', 'message': 'oops', 'timestamp': '2026-01-01T00:00:00'}]
        text = self.lm._logs_to_text(logs)
        self.assertIn('ERROR', text)
        self.assertIn('oops', text)


class TestGetLogStatistics(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.mkdtemp()
        self.lm = _lm(self.tmp)

    def tearDown(self):
        self.lm.stop()
        shutil.rmtree(self.tmp)

    def test_stats_for_missing_service_log(self):
        self.lm.add_service_logger('svc', {'level': 'INFO'})
        stats = self.lm.get_log_statistics('svc')
        # Log file may not have been written yet; should still return dict
        self.assertIsInstance(stats, dict)

    def test_stats_counts_levels(self):
        self.lm.add_service_logger('svc', {'level': 'INFO'})
        lgr = self.lm.service_loggers['svc']
        lgr.info('info msg')
        lgr.error('error msg')
        # Flush handlers
        for h in lgr.handlers:
            h.flush()
        stats = self.lm.get_log_statistics('svc')
        self.assertIn('svc', stats)

    def test_stats_for_nonexistent_service_returns_error_key(self):
        # A service that was never added has no log file
        stats = self.lm.get_log_statistics('nosuch')
        self.assertIn('nosuch', stats)
        self.assertIn('error', stats['nosuch'])


class TestGetLogFileInfo(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.mkdtemp()
        self.lm = _lm(self.tmp)

    def tearDown(self):
        self.lm.stop()
        shutil.rmtree(self.tmp)

    def test_returns_error_for_missing_log(self):
        info = self.lm.get_log_file_info('nosuchservice')
        self.assertIn('error', info)

    def test_returns_file_info_for_existing_log(self):
        self.lm.add_service_logger('svc', {'level': 'INFO'})
        lgr = self.lm.service_loggers['svc']
        lgr.info('test')
        for h in lgr.handlers:
            h.flush()
        info = self.lm.get_log_file_info('svc')
        self.assertIn('file_path', info)
        self.assertIn('exists', info)
        self.assertTrue(info['exists'])


class TestSetServiceLevel(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.mkdtemp()
        self.lm = _lm(self.tmp)

    def tearDown(self):
        self.lm.stop()
        shutil.rmtree(self.tmp)

    def test_set_level_for_known_service(self):
        import logging
        self.lm.add_service_logger('svc', {'level': 'INFO'})
        self.lm.set_service_level('svc', 'DEBUG')
        lgr = self.lm.service_loggers['svc']
        self.assertEqual(lgr.level, logging.DEBUG)

    def test_set_level_for_unknown_service_does_not_raise(self):
        self.lm.set_service_level('nosuch', 'DEBUG')  # must not raise

    def test_get_service_levels_returns_dict(self):
        self.lm.add_service_logger('svc', {'level': 'INFO'})
        levels = self.lm.get_service_levels()
        self.assertIsInstance(levels, dict)
        self.assertIn('svc', levels)


class TestGetAllLogFileInfos(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.mkdtemp()
        self.lm = _lm(self.tmp)

    def tearDown(self):
        self.lm.stop()
        shutil.rmtree(self.tmp)

    def test_returns_list(self):
        result = self.lm.get_all_log_file_infos()
        self.assertIsInstance(result, list)

    def test_includes_active_log_file(self):
        self.lm.add_service_logger('svc', {'level': 'INFO'})
        lgr = self.lm.service_loggers['svc']
        lgr.info('test')
        for h in lgr.handlers:
            h.flush()
        result = self.lm.get_all_log_file_infos()
        names = [e['file'] for e in result]
        self.assertIn('svc.log', names)

    def test_includes_rotated_log_file(self):
        # Create a fake rotated log file
        rotated = os.path.join(str(self.lm.log_dir), 'svc.log.1')
        with open(rotated, 'w') as f:
            f.write('old log\n')
        result = self.lm.get_all_log_file_infos()
        names = [e['file'] for e in result]
        self.assertIn('svc.log.1', names)


class TestCompressOldLogs(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.mkdtemp()
        self.lm = _lm(self.tmp)

    def tearDown(self):
        self.lm.stop()
        shutil.rmtree(self.tmp)

    def test_compress_old_logs_compresses_rotated_file(self):
        rotated = os.path.join(str(self.lm.log_dir), 'svc.log.1')
        with open(rotated, 'w') as f:
            f.write('old log content\n')
        self.lm.compress_old_logs()
        gz_path = rotated + '.gz'
        self.assertTrue(os.path.exists(gz_path))
        self.assertFalse(os.path.exists(rotated))

    def test_compress_old_logs_skips_already_compressed(self):
        gz_path = os.path.join(str(self.lm.log_dir), 'svc.log.1.gz')
        with gzip.open(gz_path, 'wb') as f:
            f.write(b'already compressed')
        self.lm.compress_old_logs()
        # Original gz should still exist
        self.assertTrue(os.path.exists(gz_path))


class TestStop(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.mkdtemp()
        self.lm = _lm(self.tmp)

    def tearDown(self):
        shutil.rmtree(self.tmp)

    def test_stop_sets_running_false(self):
        self.lm.stop()
        self.assertFalse(self.lm.running)

    def test_stop_closes_all_handlers(self):
        self.lm.add_service_logger('svc', {'level': 'INFO'})
        self.lm.stop()  # must not raise


if __name__ == '__main__':
    unittest.main()