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from webkitpy.common.system.deprecated_logging import log
from webkitpy.common.system.executive import ScriptError
from webkitpy.common.config.ports import WebKitPort
from webkitpy.tool.steps.options import Options


class AbstractStep(object):
    def __init__(self, tool, options):
        self._tool = tool
        if options.no_squash:
            raise ScriptError('--no-squash has been removed. Use "--git-commit=HEAD.." or "-g HEAD.." to operate on the working copy.')
        if options.squash:
            raise ScriptError('--squash has been removed. It is now the default behavior if --git-commit is omitted.')
        self._options = options
        self._port = None

    def _run_script(self, script_name, args=None, quiet=False, port=WebKitPort):
        log("Running %s" % script_name)
        command = [port.script_path(script_name)]
        if args:
            command.extend(args)
        # FIXME: This should use self.port()
        self._tool.executive.run_and_throw_if_fail(command, quiet)

    # FIXME: The port should live on the tool.
    def port(self):
        if self._port:
            return self._port
        self._port = WebKitPort.port(self._options.port)
        return self._port

    _well_known_keys = {
        "diff": lambda self, state: self._tool.scm().create_patch(self._options.git_commit),
        "changelogs": lambda self, state: self._tool.checkout().modified_changelogs(self._options.git_commit),
        "bug_title": lambda self, state: self._tool.bugs.fetch_bug(state["bug_id"]).title(),
    }

    def cached_lookup(self, state, key, promise=None):
        if state.get(key):
            return state[key]
        if not promise:
            promise = self._well_known_keys.get(key)
        state[key] = promise(self, state)
        return state[key]

    @classmethod
    def options(cls):
        return [
            # We need this option here because cached_lookup uses it.  :(
            Options.git_commit,
            # FIXME: Get rid of these.
            Options.no_squash,
            Options.squash,
        ]

    def run(self, state):
        raise NotImplementedError, "subclasses must implement"