#!/usr/bin/env python
# ex:ts=4:sw=4:sts=4:et
# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
#
# Copyright (c) 2013, Intel Corporation.
# All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# DESCRIPTION 'wic' is the OpenEmbedded Image Creator that users can
# use to generate bootable images.  Invoking it without any arguments
# will display help screens for the 'wic' command and list the
# available 'wic' subcommands.  Invoking a subcommand without any
# arguments will likewise display help screens for the specified
# subcommand.  Please use that interface for detailed help.
#
# AUTHORS
# Tom Zanussi <tom.zanussi (at] linux.intel.com>
#

__version__ = "0.1.0"

# Python Standard Library modules
import os
import sys
import optparse
import logging

# External modules
scripts_path = os.path.abspath(os.path.dirname(os.path.abspath(sys.argv[0])))
lib_path = scripts_path + '/lib'
sys.path = sys.path + [lib_path]

from image.help import *
from image.engine import *

def rootfs_dir_to_args(krootfs_dir):
    """
    Get a rootfs_dir dict and serialize to string
    """
    rootfs_dir = ''
    for k, v in krootfs_dir.items():
        rootfs_dir += ' '
        rootfs_dir += '='.join([k, v])
    return rootfs_dir.strip()

def callback_rootfs_dir(option, opt, value, parser):
    """
    Build a dict using --rootfs_dir connection=dir
    """
    if not type(parser.values.rootfs_dir) is dict:
        parser.values.rootfs_dir = dict()

    if '=' in value:
        (key, rootfs_dir) = value.split('=')
    else:
       key = 'ROOTFS_DIR'
       rootfs_dir = value

    parser.values.rootfs_dir[key] = rootfs_dir

def wic_create_subcommand(args, usage_str):
    """
    Command-line handling for image creation.  The real work is done
    by image.engine.wic_create()
    """
    parser = optparse.OptionParser(usage = usage_str)

    parser.add_option("-o", "--outdir", dest = "outdir",
                      action = "store", help = "name of directory to create image in")
    parser.add_option("-i", "--infile", dest = "properties_file",
                      action = "store", help = "name of file containing the values for image properties as a JSON file")
    parser.add_option("-e", "--image-name", dest = "image_name",
                      action = "store", help = "name of the image to use the artifacts from e.g. core-image-sato")
    parser.add_option("-r", "--rootfs-dir", dest = "rootfs_dir",
                      action = "callback", callback = callback_rootfs_dir, type = "string",
                      help = "path to the /rootfs dir to use as the .wks rootfs source")
    parser.add_option("-b", "--bootimg-dir", dest = "bootimg_dir",
                      action = "store", help = "path to the dir containing the boot artifacts (e.g. /EFI or /syslinux dirs) to use as the .wks bootimg source")
    parser.add_option("-k", "--kernel-dir", dest = "kernel_dir",
                      action = "store", help = "path to the dir containing the kernel to use in the .wks bootimg")
    parser.add_option("-n", "--native-sysroot", dest = "native_sysroot",
                      action = "store", help = "path to the native sysroot containing the tools to use to build the image")
    parser.add_option("-p", "--skip-build-check", dest = "build_check",
                      action = "store_false", default = True, help = "skip the build check")
    parser.add_option("-D", "--debug", dest = "debug", action = "store_true",
                      default = False, help = "output debug information")

    (options, args) = parser.parse_args(args)

    if len(args) != 1:
        logging.error("Wrong number of arguments, exiting\n")
        parser.print_help()
        sys.exit(1)

    if not options.image_name and not (options.rootfs_dir and
                                       options.bootimg_dir and
                                       options.kernel_dir and
                                       options.native_sysroot):
        print "Build artifacts not completely specified, exiting."
        print "  (Use 'wic -e' or 'wic -r -b -k -n' to specify artifacts)"
        sys.exit(1)

    if not options.image_name:
        options.build_check = False

    if options.build_check and not options.properties_file:
        print "Checking basic build environment..."
        if not verify_build_env():
            print "Couldn't verify build environment, exiting\n"
            sys.exit(1)
        else:
            print "Done.\n"

    print "Creating image(s)...\n"

    bitbake_env_lines = find_bitbake_env_lines(options.image_name)
    if not bitbake_env_lines:
        print "Couldn't get bitbake environment, exiting."
        sys.exit(1)
    set_bitbake_env_lines(bitbake_env_lines)

    bootimg_dir = ""

    if options.image_name:
        (rootfs_dir, kernel_dir, bootimg_dir, native_sysroot) \
            = find_artifacts(options.image_name)

    wks_file = args[0]

    if not wks_file.endswith(".wks"):
        wks_file = find_canned_image(scripts_path, wks_file)
        if not wks_file:
            print "No image named %s found, exiting.  (Use 'wic list images' to list available images, or specify a fully-qualified OE kickstart (.wks) filename)\n" % wks_file
            sys.exit(1)

    image_output_dir = ""
    if options.outdir:
        image_output_dir = options.outdir

    if not options.image_name:
        rootfs_dir = ''
        if 'ROOTFS_DIR' in options.rootfs_dir:
            rootfs_dir = options.rootfs_dir['ROOTFS_DIR']
        bootimg_dir = options.bootimg_dir
        kernel_dir = options.kernel_dir
        native_sysroot = options.native_sysroot
        if rootfs_dir and not os.path.isdir(rootfs_dir):
            print "--roofs-dir (-r) not found, exiting\n"
            sys.exit(1)
        if not os.path.isdir(bootimg_dir):
            print "--bootimg-dir (-b) not found, exiting\n"
            sys.exit(1)
        if not os.path.isdir(kernel_dir):
            print "--kernel-dir (-k) not found, exiting\n"
            sys.exit(1)
        if not os.path.isdir(native_sysroot):
            print "--native-sysroot (-n) not found, exiting\n"
            sys.exit(1)
    else:
        not_found = not_found_dir = ""
        if not os.path.isdir(rootfs_dir):
            (not_found, not_found_dir) = ("rootfs-dir", rootfs_dir)
        elif not os.path.isdir(kernel_dir):
            (not_found, not_found_dir) = ("kernel-dir", kernel_dir)
        elif not os.path.isdir(native_sysroot):
            (not_found, not_found_dir) = ("native-sysroot", native_sysroot)
        if not_found:
            if not not_found_dir:
                not_found_dir = "Completely missing artifact - wrong image (.wks) used?"
            print "Build artifacts not found, exiting."
            print "  (Please check that the build artifacts for the machine"
            print "   selected in local.conf actually exist and that they"
            print "   are the correct artifacts for the image (.wks file)).\n"
            print "The artifact that couldn't be found was %s:\n  %s" % \
                (not_found, not_found_dir)
            sys.exit(1)

    krootfs_dir = options.rootfs_dir
    if krootfs_dir is None:
         krootfs_dir = {}
         krootfs_dir['ROOTFS_DIR'] = rootfs_dir

    rootfs_dir = rootfs_dir_to_args(krootfs_dir)

    wic_create(args, wks_file, rootfs_dir, bootimg_dir, kernel_dir,
               native_sysroot, scripts_path, image_output_dir,
               options.debug, options.properties_file)


def wic_list_subcommand(args, usage_str):
    """
    Command-line handling for listing available image properties and
    values.  The real work is done by image.engine.wic_list()
    """
    parser = optparse.OptionParser(usage = usage_str)

    parser.add_option("-o", "--outfile", action = "store",
                      dest = "properties_file",
                      help = "dump the possible values for image properties to a JSON file")

    (options, args) = parser.parse_args(args)

    bitbake_env_lines = find_bitbake_env_lines(None)
    if not bitbake_env_lines:
        print "Couldn't get bitbake environment, exiting."
        sys.exit(1)
    set_bitbake_env_lines(bitbake_env_lines)

    if not wic_list(args, scripts_path, options.properties_file):
        logging.error("Bad list arguments, exiting\n")
        parser.print_help()
        sys.exit(1)


def wic_help_topic_subcommand(args, usage_str):
    """
    Command-line handling for help-only 'subcommands'.  This is
    essentially a dummy command that doesn nothing but allow users to
    use the existing subcommand infrastructure to display help on a
    particular topic not attached to any particular subcommand.
    """
    pass


wic_help_topic_usage = """
"""

subcommands = {
    "create":    [wic_create_subcommand,
                  wic_create_usage,
                  wic_create_help],
    "list":      [wic_list_subcommand,
                  wic_list_usage,
                  wic_list_help],
    "plugins":   [wic_help_topic_subcommand,
                  wic_help_topic_usage,
                  wic_plugins_help],
    "overview":   [wic_help_topic_subcommand,
                  wic_help_topic_usage,
                  wic_overview_help],
    "kickstart":  [wic_help_topic_subcommand,
                  wic_help_topic_usage,
                  wic_kickstart_help],
}


def start_logging(loglevel):
    logging.basicConfig(filname = 'wic.log', filemode = 'w', level=loglevel)


def main():
    parser = optparse.OptionParser(version = "wic version %s" % __version__,
                                   usage = wic_usage)

    parser.disable_interspersed_args()

    (options, args) = parser.parse_args()

    if len(args):
        if args[0] == "help":
            if len(args) == 1:
                parser.print_help()
                sys.exit(1)

    invoke_subcommand(args, parser, wic_help_usage, subcommands)


if __name__ == "__main__":
    try:
        ret = main()
    except Exception:
        ret = 1
        import traceback
        traceback.print_exc(5)
    sys.exit(ret)