#!/usr/bin/python3
# -*- coding: utf-8 -*-

import argparse

from spoc import repo_local
from spoc import repo_online
from spoc import repo_publish
from spoc.image import Image
from spoc.imagebuilder import ImageBuilder
from spoc.cli import ActionQueue, ActionItem, readable_size

ACTION_LIST = 1
ACTION_DOWNLOAD = 2
ACTION_DELETE = 3
ACTION_BUILD = 4
ACTION_PUBLISH = 5
ACTION_UNPUBLISH = 6

def get_image_name(file_path):
    # Read and return image name from image file
    with open(file_path) as f:
        for line in f:
            if line.startswith('IMAGE '):
                return line.split()[1]
    return None

def listing(repo_type):
    if repo_type == 'installed':
        images = repo_local.get_images()
    elif repo_type == 'online':
        images = repo_online.get_images()
    elif repo_type == 'published':
        images = repo_publish.get_images()
    for image in images:
        print(image)

def download(image_name):
    actionqueue = ActionQueue()
    local_images = repo_local.get_images()
    for layer in repo_online.get_image(image_name)['layers']:
        if layer not in local_images:
            image = Image(layer, False)
            actionqueue.append(ActionItem(f'Downloading {image_name}', image.download))
            actionqueue.append(ActionItem(f'Unpacking {image_name}', image.unpack_downloaded))
    actionqueue.process()

def delete(image_name):
    Image(image_name, False).delete()

def build(filename, force, do_publish):
    # Check if a build is needed and attempt to build the image from image file
    image_name = get_image_name(filename)
    if force or image_name not in repo_local.get_images():
        image = Image(image_name, False)
        print(f'Building image {image_name} from file {filename}')
        image.delete()
        image.create(ImageBuilder(), filename)
        print(f'Image {image_name} built successfully')
        # If publishing was requested, force publish after successful build
        force = True
    else:
        print(f'Image {image_name} already built, skipping build task')
    if do_publish:
        publish(image_name, force)

def publish(image_name, force):
    # Check if publishing is needed and attempt to publish the image
    if force or image_name not in repo_publish.get_images():
        image = Image(image_name)
        image.unpublish()
        print(f'Publishing image {image_name}')
        image.publish()
        print(f'Image {image_name} compressed from {readable_size(image.size)} to {readable_size(image.dlsize)} and published successfully')
    else:
        print(f'Image {image_name} already published, skipping publish task')

def unpublish(image_name):
    Image(image_name, False).unpublish()

parser = argparse.ArgumentParser(description='SPOC image manager')
parser.set_defaults(action=None)
subparsers = parser.add_subparsers()

parser_list = subparsers.add_parser('list')
parser_list.set_defaults(action=ACTION_LIST)
parser_list.add_argument('type', choices=('installed', 'online', 'published'), default='installed', const='installed', nargs='?')

parser_download = subparsers.add_parser('download')
parser_download.set_defaults(action=ACTION_DOWNLOAD)
parser_download.add_argument('image')

parser_delete = subparsers.add_parser('delete')
parser_delete.set_defaults(action=ACTION_DELETE)
parser_delete.add_argument('image')

parser_build = subparsers.add_parser('build')
parser_build.set_defaults(action=ACTION_BUILD)
parser_build.add_argument('-f', '--force', action='store_true', help='Force rebuild already existing image')
parser_build.add_argument('-p', '--publish', action='store_true', help='Publish the image after successful build')
parser_build.add_argument('file')

parser_publish = subparsers.add_parser('publish')
parser_publish.set_defaults(action=ACTION_PUBLISH)
parser_publish.add_argument('-f', '--force', action='store_true', help='Force republish already published image')
parser_publish.add_argument('image')

parser_unpublish = subparsers.add_parser('unpublish')
parser_unpublish.set_defaults(action=ACTION_UNPUBLISH)
parser_unpublish.add_argument('image')

args = parser.parse_args()

if args.action == ACTION_LIST:
    listing(args.type)
elif args.action == ACTION_DOWNLOAD:
    download(args.image)
elif args.action == ACTION_DELETE:
    delete(args.image)
elif args.action == ACTION_BUILD:
    build(args.file, args.force, args.publish)
elif args.action == ACTION_PUBLISH:
    publish(args.image, args.force)
elif args.action == ACTION_UNPUBLISH:
    unpublish(args.image)
else:
    parser.print_usage()