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import os

from webkitpy.common.checkout.changelog import ChangeLog

from webkitpy.common.system.executive import ScriptError

from webkitpy.tool.steps.abstractstep import AbstractStep

from webkitpy.tool.steps.options import Options

from webkitpy.common.system.deprecated_logging import error

class PrepareChangeLog(AbstractStep):

    @classmethod

    def options(cls):

        return AbstractStep.options() + [

            Options.port,

            Options.quiet,

            Options.email,

            Options.git_commit,

        ]

    def _ensure_bug_url(self, state):

        if not state.get("bug_id"):

            return

        bug_id = state.get("bug_id")

        changelogs = self.cached_lookup(state, "changelogs")

        for changelog_path in changelogs:

            changelog = ChangeLog(changelog_path)

            if not changelog.latest_entry().bug_id():

                changelog.set_short_description_and_bug_url(

                    self.cached_lookup(state, "bug_title"),

                    self._tool.bugs.bug_url_for_bug_id(bug_id))

    def run(self, state):

        if self.cached_lookup(state, "changelogs"):

            self._ensure_bug_url(state)

            return

        os.chdir(self._tool.scm().checkout_root)

        args = [self.port().script_path("prepare-ChangeLog")]

        if state.get("bug_id"):

            args.append("--bug=%s" % state["bug_id"])

        if self._options.email:

            args.append("--email=%s" % self._options.email)

        if self._tool.scm().supports_local_commits():

            args.append("--merge-base=%s" % self._tool.scm().merge_base(self._options.git_commit))

        try:

            self._tool.executive.run_and_throw_if_fail(args, self._options.quiet)

        except ScriptError, e:

            error("Unable to prepare ChangeLogs.")

        state["diff"] = None # We've changed the diff