# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

from mercurial.utils import stringutil
from mercurial.node import short
from mozautomation.commitparser import (
    parse_requal_reviewers,
    is_backout,
)
from mozhg.util import repo_owner


from ..checks import PreTxnChangegroupCheck, print_banner

IPC_PEERS = [
    {
        "name": b"Andrew McCreight",
        "nick": [b"mccr8"],
        "email": [b"continuation@gmail.com"],
    },
    {"name": b"Jed Davis", "nick": [b"jld"], "email": [b"jld@mozilla.com"]},
    {"name": b"Nika Layzell", "nick": [b"nika"], "email": [b"nika@thelayzells.com"]},
    {"name": b"David Parks", "nick": [b"handyman"], "email": [b"daparks@mozilla.com"]},
]

MISSING_REVIEW = b"""
Changeset %s alters sync-messages.ini without IPC peer review.

Please, request review from either:
"""
for p in IPC_PEERS:
    MISSING_REVIEW += b"  - %s (:%s)\n" % (p["name"], p["nick"][0])


class SyncIPCCheck(PreTxnChangegroupCheck):
    """Changes to ipc/ipdl/sync-messages.ini requires IPC peer review."""

    @property
    def name(self):
        return b"ipcsync_check"

    def relevant(self):
        return (
            self.repo_metadata[b"firefox_releasing"]
            and repo_owner(self.repo) != b"scm_allow_direct_push"
        )

    def pre(self, node):
        # Accept the entire push for code uplifts
        self.is_uplift = b"a=release" in self.repo[b"tip"].description().lower()

    def check(self, ctx):
        if self.is_uplift:
            return True

        # Ignore merge changesets
        if len(ctx.parents()) > 1:
            return True

        # Ignore backouts
        if is_backout(ctx.description()):
            return True

        # Ignore changes that don't touch sync-messages.ini
        ipc_files = [f for f in ctx.files() if f == b"ipc/ipdl/sync-messages.ini"]
        if not ipc_files:
            return True

        # Allow patches authored by peers
        if self._is_peer_email(stringutil.email(ctx.user())):
            return True

        # Allow if reviewed by any peer
        requal = list(parse_requal_reviewers(ctx.description()))
        if any(self._is_peer_nick(nick) for nick in requal):
            return True

        # Reject
        print_banner(self.ui, b"error", MISSING_REVIEW % short(ctx.node()))
        return False

    def post_check(self):
        return True

    @staticmethod
    def _is_peer_email(email):
        email = email.lower()
        for peer in IPC_PEERS:
            if email in peer["email"]:
                return True
        return False

    @staticmethod
    def _is_peer_nick(nick):
        nick = nick.lower()
        for peer in IPC_PEERS:
            if nick in peer["nick"]:
                return True
        return False