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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.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._tool.port().prepare_changelog_command()
        if state.get("bug_id"):
            args.append("--bug=%s" % state["bug_id"])
            args.append("--description=%s" % self._tool.bugs.fetch_bug(state["bug_id"]).title())
        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))

        args.extend(self._changed_files(state))

        try:
            self._tool.executive.run_and_throw_if_fail(args, self._options.quiet)
        except ScriptError, e:
            error("Unable to prepare ChangeLogs.")
        self.did_modify_checkout(state)