# Copyright (C) 2009 Google Inc. All rights reserved.
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import logging

from webkitpy.tool import steps

from webkitpy.common.checkout.scm import CheckoutNeedsUpdate
from webkitpy.common.system.executive import ScriptError
from webkitpy.tool.bot.queueengine import QueueEngine

_log = logging.getLogger(__name__)


class StepSequenceErrorHandler():
    @classmethod
    def handle_script_error(cls, tool, patch, script_error):
        raise NotImplementedError('subclasses must implement')

    @classmethod
    def handle_checkout_needs_update(cls, tool, state, options, error):
        raise NotImplementedError('subclasses must implement')


class StepSequence(object):
    def __init__(self, steps):
        self._steps = steps or []

    def options(self):
        collected_options = [
            steps.Options.parent_command,
            steps.Options.quiet,
        ]
        for step in self._steps:
            collected_options = collected_options + step.options()
        # Remove duplicates.
        collected_options = sorted(set(collected_options), key=lambda option: option.dest)
        return collected_options

    def _run(self, tool, options, state):
        for step in self._steps:
            step(tool, options).run(state)

    def run_and_handle_errors(self, tool, options, state=None):
        if not state:
            state = {}
        try:
            self._run(tool, options, state)
        except CheckoutNeedsUpdate as e:
            _log.info("Commit failed because the checkout is out of date. Please update and try again.")
            if options.parent_command:
                command = tool.command_by_name(options.parent_command)
                command.handle_checkout_needs_update(tool, state, options, e)
            QueueEngine.exit_after_handled_error(e)
        except ScriptError as e:
            if not options.quiet:
                _log.error(e.message_with_output(output_limit=5000))
            if options.parent_command:
                command = tool.command_by_name(options.parent_command)
                if command:
                    command.handle_script_error(tool, state, e)
            QueueEngine.exit_after_handled_error(e)
