# Copyright (c) 2009 Google Inc. All rights reserved.

#

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# modification, are permitted provided that the following conditions are

# met:

# 

#     * Redistributions of source code must retain the above copyright

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#     * Redistributions in binary form must reproduce the above

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# in the documentation and/or other materials provided with the

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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

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import datetime

import os

import shutil

import tempfile

import threading

import unittest

from webkitpy.common.system.executive import ScriptError

from webkitpy.tool.bot.queueengine import QueueEngine, QueueEngineDelegate

class LoggingDelegate(QueueEngineDelegate):

    def __init__(self, test):

        self._test = test

        self._callbacks = []

        self._run_before = False

    expected_callbacks = [

        'queue_log_path',

        'begin_work_queue',

        'should_continue_work_queue',

        'next_work_item',

        'should_proceed_with_work_item',

        'work_item_log_path',

        'process_work_item',

        'should_continue_work_queue'

    ]

    def record(self, method_name):

        self._callbacks.append(method_name)

    def queue_log_path(self):

        self.record("queue_log_path")

        return os.path.join(self._test.temp_dir, "queue_log_path")

    def work_item_log_path(self, work_item):

        self.record("work_item_log_path")

        return os.path.join(self._test.temp_dir, "work_log_path", "%s.log" % work_item)

    def begin_work_queue(self):

        self.record("begin_work_queue")

    def should_continue_work_queue(self):

        self.record("should_continue_work_queue")

        if not self._run_before:

            self._run_before = True

            return True

        return False

    def next_work_item(self):

        self.record("next_work_item")

        return "work_item"

    def should_proceed_with_work_item(self, work_item):

        self.record("should_proceed_with_work_item")

        self._test.assertEquals(work_item, "work_item")

        fake_patch = { 'bug_id' : 42 }

        return (True, "waiting_message", fake_patch)

    def process_work_item(self, work_item):

        self.record("process_work_item")

        self._test.assertEquals(work_item, "work_item")

        return True

    def handle_unexpected_error(self, work_item, message):

        self.record("handle_unexpected_error")

        self._test.assertEquals(work_item, "work_item")

class ThrowErrorDelegate(LoggingDelegate):

    def __init__(self, test, error_code):

        LoggingDelegate.__init__(self, test)

        self.error_code = error_code

    def process_work_item(self, work_item):

        self.record("process_work_item")

        raise ScriptError(exit_code=self.error_code)

class NotSafeToProceedDelegate(LoggingDelegate):

    def should_proceed_with_work_item(self, work_item):

        self.record("should_proceed_with_work_item")

        self._test.assertEquals(work_item, "work_item")

        return False

class FastQueueEngine(QueueEngine):

    def __init__(self, delegate):

        QueueEngine.__init__(self, "fast-queue", delegate, threading.Event())

    # No sleep for the wicked.

    seconds_to_sleep = 0

    def _sleep(self, message):

        pass

class QueueEngineTest(unittest.TestCase):

    def test_trivial(self):

        delegate = LoggingDelegate(self)

        work_queue = QueueEngine("trivial-queue", delegate, threading.Event())

        work_queue.run()

        self.assertEquals(delegate._callbacks, LoggingDelegate.expected_callbacks)

        self.assertTrue(os.path.exists(os.path.join(self.temp_dir, "queue_log_path")))

        self.assertTrue(os.path.exists(os.path.join(self.temp_dir, "work_log_path", "work_item.log")))

    def test_unexpected_error(self):

        delegate = ThrowErrorDelegate(self, 3)

        work_queue = QueueEngine("error-queue", delegate, threading.Event())

        work_queue.run()

        expected_callbacks = LoggingDelegate.expected_callbacks[:]

        work_item_index = expected_callbacks.index('process_work_item')

        # The unexpected error should be handled right after process_work_item starts

        # but before any other callback.  Otherwise callbacks should be normal.

        expected_callbacks.insert(work_item_index + 1, 'handle_unexpected_error')

        self.assertEquals(delegate._callbacks, expected_callbacks)

    def test_handled_error(self):

        delegate = ThrowErrorDelegate(self, QueueEngine.handled_error_code)

        work_queue = QueueEngine("handled-error-queue", delegate, threading.Event())

        work_queue.run()

        self.assertEquals(delegate._callbacks, LoggingDelegate.expected_callbacks)

    def test_not_safe_to_proceed(self):

        delegate = NotSafeToProceedDelegate(self)

        work_queue = FastQueueEngine(delegate)

        work_queue.run()

        expected_callbacks = LoggingDelegate.expected_callbacks[:]

        next_work_item_index = expected_callbacks.index('next_work_item')

        # We slice out the common part of the expected callbacks.

        # We add 2 here to include should_proceed_with_work_item, which is

        # a pain to search for directly because it occurs twice.

        expected_callbacks = expected_callbacks[:next_work_item_index + 2]

        expected_callbacks.append('should_continue_work_queue')

        self.assertEquals(delegate._callbacks, expected_callbacks)

    def test_now(self):

        """Make sure there are no typos in the QueueEngine.now() method."""

        engine = QueueEngine("test", None, None)

        self.assertTrue(isinstance(engine._now(), datetime.datetime))

    def test_sleep_message(self):

        engine = QueueEngine("test", None, None)

        engine._now = lambda: datetime.datetime(2010, 1, 1)

        expected_sleep_message = "MESSAGE Sleeping until 2010-01-01 00:02:00 (2 mins)."

        self.assertEqual(engine._sleep_message("MESSAGE"), expected_sleep_message)

    def setUp(self):

        self.temp_dir = tempfile.mkdtemp(suffix="work_queue_test_logs")

    def tearDown(self):

        shutil.rmtree(self.temp_dir)

if __name__ == '__main__':

    unittest.main()