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import logging
import sys

from webkitpy.tool import steps

from webkitpy.common.system.executive import ScriptError

_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))
        return collected_options

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

    # Child processes exit with a special code to the parent queue process can detect the error was handled.
    handled_error_code = 2

    @classmethod
    def exit_after_handled_error(cls, error):
        _log.error(error)
        sys.exit(cls.handled_error_code)

    def run_and_handle_errors(self, tool, options, state=None):
        if not state:
            state = {}
        try:
            self._run(tool, options, state)
        except ScriptError, e:
            if not options.quiet:
                _log.error(e.message_with_output())
            if options.parent_command:
                command = tool.command_by_name(options.parent_command)
                command.handle_script_error(tool, state, e)
            self.exit_after_handled_error(e)