#!/usr/bin/python3
#
# Live Media Creator
#
# Copyright (C) 2011-2018  Red Hat, Inc.
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
#
import logging
log = logging.getLogger("livemedia-creator")

import glob
import os
import sys
import tempfile

# Use the Lorax treebuilder branch for iso creation
from pylorax import setup_logging, find_templates, vernum, log_selinux_state
from pylorax.cmdline import lmc_parser
from pylorax.creator import run_creator, DRACUT_DEFAULT
from pylorax.imgutils import default_image_name
from pylorax.sysutils import joinpaths


def main():
    parser = lmc_parser(DRACUT_DEFAULT)
    opts = parser.parse_args()

    setup_logging(opts.logfile, log)

    log.debug( opts )

    log.info("livemedia-creator v%s", vernum)
    log_selinux_state()

    # Find the lorax templates
    opts.lorax_templates = find_templates(opts.lorax_templates or "/usr/share/lorax")

    # Check for invalid combinations of options, print all the errors and exit.
    errors = []
    if not opts.disk_image and not opts.fs_image and not opts.ks:
        errors.append("Image creation requires a kickstart file")

    if opts.ks and not os.path.exists(opts.ks[0]):
        errors.append("kickstart file (%s) is missing." % opts.ks[0])

    if opts.make_iso and not os.path.exists(opts.lorax_templates):
        errors.append("The lorax templates directory (%s) doesn't "
                      "exist." % opts.lorax_templates)

    if opts.result_dir and os.path.exists(opts.result_dir):
        errors.append("The results_dir (%s) should not exist, please delete or "
                      "move its contents" % opts.result_dir)

    # Default to putting results under tmp
    if not opts.result_dir:
        opts.result_dir = opts.tmp

    if opts.iso and not os.path.exists(opts.iso):
        errors.append("The iso %s is missing." % opts.iso)

    if opts.disk_image and not os.path.exists(opts.disk_image):
        errors.append("The disk image %s is missing." % opts.disk_image)

    if opts.fs_image and not os.path.exists(opts.fs_image):
        errors.append("The filesystem image %s is missing." % opts.fs_image)

    is_install = not (opts.disk_image or opts.fs_image)
    if is_install and not opts.no_virt and not opts.iso:
        errors.append("virt install needs an install iso.")

    if opts.volid and len(opts.volid) > 32:
        errors.append("the volume id cannot be longer than 32 characters")

    if is_install and not opts.no_virt \
       and not any(glob.glob("/usr/bin/qemu-system-*")):
        errors.append("qemu needs to be installed.")

    if is_install and opts.no_virt \
       and not os.path.exists("/usr/sbin/anaconda"):
        errors.append("no-virt requires anaconda to be installed.")

    if opts.make_appliance and not opts.app_template:
        opts.app_template = joinpaths(opts.lorax_templates,
                                            "appliance/libvirt.tmpl")

    if opts.make_appliance and not os.path.exists(opts.app_template):
        errors.append("The appliance template (%s) doesn't "
                      "exist" % opts.app_template)

    if opts.image_name and os.path.exists(joinpaths(opts.result_dir, opts.image_name)):
        errors.append("The disk image to be created should not exist.")

    # Vagrant creates a qcow2 inside a tar, turn on qcow2
    if opts.make_vagrant:
        opts.image_type = "qcow2"

    # Alias --qcow2 to --image-type=qcow2
    if opts.qcow2:
        opts.image_type = "qcow2"

    if opts.image_type and not os.path.exists("/usr/bin/qemu-img"):
        errors.append("image-type requires the qemu-img utility to be installed." % opts.image_type)

    if opts.image_type and opts.make_iso:
        errors.append("image-type cannot be used to make a bootable iso.")

    if opts.image_type and opts.make_fsimage:
        errors.append("image-type cannot be used to make filesystem images.")

    if opts.image_type and opts.make_tar:
        errors.append("image-type cannot be used to make a tar.")

    if opts.make_oci and not (opts.oci_config and opts.oci_runtime):
        errors.append("--make-oci requires --oci-config and --oci-runtime")

    if opts.make_oci and not os.path.exists(opts.oci_config):
        errors.append("oci % file is missing" % opts.oci_config)

    if opts.make_oci and not os.path.exists(opts.oci_runtime):
        errors.append("oci % file is missing" % opts.oci_runtime)

    if opts.make_vagrant and opts.vagrant_metadata and not os.path.exists(opts.vagrant_metadata):
        errors.append("Vagrant metadata file %s is missing" % opts.vagrant_metadata)

    if opts.virt_uefi and not os.path.isdir(opts.ovmf_path):
        errors.append("The OVMF firmware is missing from %s" % opts.ovmf_path)
    elif opts.virt_uefi and os.path.isdir(opts.ovmf_path):
        for f in ["OVMF_CODE.fd", "OVMF_VARS.fd"]:
            if not os.path.exists(joinpaths(opts.ovmf_path, f)):
                errors.append("OVMF firmware file %s is missing from %s" % (f, opts.ovmf_path))

    if os.getuid() != 0:
        errors.append("You need to run this as root")

    if errors:
        list(log.error(e) for e in errors)
        sys.exit(1)

    if not os.path.exists(opts.result_dir):
        os.makedirs(opts.result_dir)

    # AMI image is just a fsimage with an AMI label
    if opts.make_ami:
        opts.make_fsimage = True
        if not opts.image_name:
            opts.image_name = "ami-root.img"
        if opts.fs_label == "Anaconda":
            opts.fs_label = "AMI"
    elif opts.make_tar:
        if not opts.image_name:
            opts.image_name = default_image_name(opts.compression, "root.tar")
        if opts.compression == "xz" and not opts.compress_args:
            opts.compress_args = ["-9"]
    elif opts.make_oci:
        if not opts.image_name:
            opts.image_name = default_image_name(opts.compression, "bundle.tar")
        if opts.compression == "xz" and not opts.compress_args:
            opts.compress_args = ["-9"]
    elif opts.make_vagrant:
        if not opts.image_name:
            opts.image_name = default_image_name(opts.compression, "vagrant.tar")
        if opts.compression == "xz" and not opts.compress_args:
            opts.compress_args = ["-9"]

    if opts.app_file:
        opts.app_file = joinpaths(opts.result_dir, opts.app_file)

    if opts.make_ostree_live:
        opts.make_pxe_live = True
        opts.ostree = True
    else:
        opts.ostree = False

    tempfile.tempdir = opts.tmp
    disk_img = None

    try:
        # TODO - Better API than passing in opts
        (result_dir, disk_img) = run_creator(opts)
    except Exception as e:                                  # pylint: disable=broad-except
        log.error(str(e))
        sys.exit(1)

    log.info("SUMMARY")
    log.info("-------")
    log.info("Logs are in %s", os.path.abspath(os.path.dirname(opts.logfile)))
    if disk_img:
        log.info("Disk image is at %s", disk_img)
    if opts.make_appliance:
        log.info("Appliance description is in %s", opts.app_file)
    log.info("Results are in %s", result_dir or opts.result_dir)

    sys.exit( 0 )

if __name__ == '__main__':
    main()
