#!/usr/bin/env python3
# encoding: utf-8
# === This file is part of Calamares - <http://github.com/calamares> ===
#
# Copyright 2014, Philip Müller <philm@manjaro.org>
#
# Calamares is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Calamares is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Calamares. If not, see <http://www.gnu.org/licenses/>.

import libcalamares
import os


def modify_grub_default(partitions, root_mount_point, distributor):

    default_dir = os.path.join(root_mount_point, "etc/default")
    default_grub = os.path.join(default_dir, "grub")
    plymouth_bin = os.path.join(root_mount_point, "usr/bin/plymouth")
    use_splash = ""
    swap_uuid = ""

    if os.path.exists(plymouth_bin):
        use_splash = "splash"

    for partition in partitions:
        if partition["fs"] == "linuxswap":
            swap_uuid = partition["uuid"]

    if swap_uuid != "":
        kernel_cmd = 'GRUB_CMDLINE_LINUX_DEFAULT="resume=UUID=%s quiet %s"' % (swap_uuid, use_splash)
    else:
        kernel_cmd = 'GRUB_CMDLINE_LINUX_DEFAULT="quiet %s"' % use_splash

    distributor_line = "GRUB_DISTRIBUTOR='%s'" % distributor.replace("'", "'\\''")

    if not os.path.exists(default_dir):
        os.mkdir(default_dir)

    have_kernel_cmd = False
    have_distributor_line = False

    if "overwrite" in libcalamares.job.configuration:
        overwrite = libcalamares.job.configuration["overwrite"]
    else:
        overwrite = False

    if os.path.exists(default_grub) and not overwrite:
        with open(default_grub, 'r') as grub_file:
            lines = [x.strip() for x in grub_file.readlines()]

        for i in range(len(lines)):
            if lines[i].startswith("#GRUB_CMDLINE_LINUX_DEFAULT"):
                lines[i] = kernel_cmd
                have_kernel_cmd = True
            elif lines[i].startswith("GRUB_CMDLINE_LINUX_DEFAULT"):
                lines[i] = kernel_cmd
                have_kernel_cmd = True
            elif lines[i].startswith("#GRUB_DISTRIBUTOR") or lines[i].startswith("GRUB_DISTRIBUTOR"):
                lines[i] = distributor_line
                have_distributor_line = True
    else:
        lines = []
        if "defaults" in libcalamares.job.configuration:
            for key, value in libcalamares.job.configuration["defaults"].items():
                if value.__class__.__name__ == "bool":
                    if value:
                        escaped_value = "true"
                    else:
                        escaped_value = "false"
                else:
                    escaped_value = str(value).replace("'", "'\\''")
                lines.append("%s='%s'" % (key, escaped_value))

    if not have_kernel_cmd:
        lines.append(kernel_cmd)

    if not have_distributor_line:
        lines.append(distributor_line)

    with open(default_grub, 'w') as grub_file:
        grub_file.write("\n".join(lines) + "\n")

    return None

def run():
    partitions = libcalamares.globalstorage.value("partitions")
    root_mount_point = libcalamares.globalstorage.value("rootMountPoint")
    branding = libcalamares.globalstorage.value("branding")
    distributor = branding["bootloaderEntryName"]
    return modify_grub_default(partitions, root_mount_point, distributor)