#!/usr/bin/env python
# -*- coding: utf-8 -*-


from math import ceil

import requests
from flask import Blueprint, url_for
from flask import request
import json
import jimit as ji
import os

from jimvc.api.base import Base
from jimvc.models import Guest, Config, Disk
from jimvc.models import Snapshot, SnapshotDiskMapping
from jimvc.models import OSTemplateImage
from jimvc.models import Utils
from jimvc.models import Rules
from jimvc.models import OSTemplateImageKind


__author__ = 'James Iter'
__date__ = '2018/4/10'
__contact__ = 'james.iter.cn@gmail.com'
__copyright__ = '(c) 2018 by James Iter.'


blueprint = Blueprint(
    'api_snapshot',
    __name__,
    url_prefix='/api/snapshot'
)

blueprints = Blueprint(
    'api_snapshots',
    __name__,
    url_prefix='/api/snapshots'
)


snapshot_base = Base(the_class=Snapshot, the_blueprint=blueprint, the_blueprints=blueprints)


@Utils.dumps2response
def r_create():

    args_rules = [
        Rules.GUEST_UUID.value
    ]

    if 'label' in request.json:
        args_rules.append(
            Rules.LABEL.value,
        )

    try:
        ret = dict()
        ret['state'] = ji.Common.exchange_state(20000)

        ji.Check.previewing(args_rules, request.json)

        snapshot = Snapshot()
        guest = Guest()
        guest.uuid = request.json.get('guest_uuid')
        guest.get_by('uuid')

        snapshot.label = request.json.get('label', '')
        snapshot.status = guest.status
        snapshot.guest_uuid = guest.uuid
        snapshot.snapshot_id = '_'.join(['tmp', ji.Common.generate_random_code(length=8)])
        snapshot.parent_id = '-'
        snapshot.progress = 0

        snapshot.create()
        snapshot.get_by('snapshot_id')

        message = {
            '_object': 'snapshot',
            'action': 'create',
            'uuid': guest.uuid,
            'node_id': guest.node_id,
            'passback_parameters': {'id': snapshot.id}
        }

        Utils.emit_instruction(message=json.dumps(message, ensure_ascii=False))

        ret['data'] = snapshot.__dict__
        return ret

    except ji.PreviewingError, e:
        return json.loads(e.message)


@Utils.dumps2response
def r_update(snapshot_id):

    snapshot = Snapshot()

    args_rules = [
        Rules.SNAPSHOT_ID.value
    ]

    if 'label' in request.json:
        args_rules.append(
            Rules.LABEL.value,
        )

    if args_rules.__len__() < 2:
        ret = dict()
        ret['state'] = ji.Common.exchange_state(20000)
        return ret

    request.json['snapshot_id'] = snapshot_id

    try:
        ji.Check.previewing(args_rules, request.json)
        snapshot.snapshot_id = request.json.get('snapshot_id')

        snapshot.get_by('snapshot_id')
        snapshot.label = request.json.get('label', snapshot.label)

        snapshot.update()
        snapshot.get()

        ret = dict()
        ret['state'] = ji.Common.exchange_state(20000)
        ret['data'] = snapshot.__dict__
        return ret
    except ji.PreviewingError, e:
        return json.loads(e.message)


@Utils.dumps2response
def r_get(snapshots_id):
    return snapshot_base.get(ids=snapshots_id, ids_rule=Rules.SNAPSHOTS_ID.value, by_field='snapshot_id')


@Utils.dumps2response
def r_get_by_filter():
    return snapshot_base.get_by_filter()


@Utils.dumps2response
def r_content_search():
    return snapshot_base.content_search()


@Utils.dumps2response
def r_delete(snapshots_id):

    args_rules = [
        Rules.SNAPSHOTS_ID.value
    ]

    try:
        ji.Check.previewing(args_rules, {'snapshots_id': snapshots_id})

        snapshot = Snapshot()
        guest = Guest()

        # 检测所指定的 快照 都存在
        for snapshot_id in snapshots_id.split(','):
            snapshot.snapshot_id = snapshot_id
            snapshot.get_by('snapshot_id')

            guest.uuid = snapshot.guest_uuid
            guest.get_by('uuid')

        # 执行删除操作
        for snapshot_id in snapshots_id.split(','):
            snapshot.snapshot_id = snapshot_id
            snapshot.get_by('snapshot_id')

            guest.uuid = snapshot.guest_uuid
            guest.get_by('uuid')

            message = {
                '_object': 'snapshot',
                'action': 'delete',
                'uuid': snapshot.guest_uuid,
                'snapshot_id': snapshot.snapshot_id,
                'node_id': guest.node_id,
                'passback_parameters': {'id': snapshot.id}
            }

            Utils.emit_instruction(message=json.dumps(message))

            # 删除创建失败的 快照
            if snapshot.progress == 255:
                SnapshotDiskMapping.delete_by_filter(filter_str=':'.join(['snapshot_id', 'eq', snapshot.snapshot_id]))
                snapshot.delete()

            else:
                snapshot.progress = 254
                snapshot.update()

        ret = dict()
        ret['state'] = ji.Common.exchange_state(20000)
        return ret

    except ji.PreviewingError, e:
        return json.loads(e.message)


@Utils.dumps2response
def r_revert(snapshot_id):

    args_rules = [
        Rules.SNAPSHOT_ID.value
    ]

    try:
        ret = dict()
        ret['state'] = ji.Common.exchange_state(20000)

        ji.Check.previewing(args_rules, {'snapshot_id': snapshot_id})

        snapshot = Snapshot()
        guest = Guest()

        snapshot.snapshot_id = snapshot_id
        snapshot.get_by('snapshot_id')
        snapshot.progress = 253
        snapshot.update()
        snapshot.get()

        guest.uuid = snapshot.guest_uuid
        guest.get_by('uuid')

        message = {
            '_object': 'snapshot',
            'action': 'revert',
            'uuid': guest.uuid,
            'snapshot_id': snapshot.snapshot_id,
            'node_id': guest.node_id,
            'passback_parameters': {'id': snapshot.id}
        }

        Utils.emit_instruction(message=json.dumps(message, ensure_ascii=False))

        ret['data'] = snapshot.__dict__
        return ret

    except ji.PreviewingError, e:
        return json.loads(e.message)


@Utils.dumps2response
def r_get_disks(snapshot_id):

    args_rules = [
        Rules.SNAPSHOT_ID.value
    ]

    try:
        ret = dict()
        ret['state'] = ji.Common.exchange_state(20000)
        ret['data'] = list()

        ji.Check.previewing(args_rules, {'snapshot_id': snapshot_id})

        rows, _ = SnapshotDiskMapping.get_by_filter(filter_str=':'.join(['snapshot_id', 'eq', snapshot_id]))

        for row in rows:
            ret['data'].append(row['disk_uuid'])

        return ret

    except ji.PreviewingError, e:
        return json.loads(e.message)


@Utils.dumps2response
def r_get_snapshots_by_disks_uuid(disks_uuid):

    args_rules = [
        Rules.UUIDS.value
    ]

    try:
        ret = dict()
        ret['state'] = ji.Common.exchange_state(20000)
        ret['data'] = list()

        ji.Check.previewing(args_rules, {'uuids': disks_uuid})

        rows, _ = SnapshotDiskMapping.get_by_filter(filter_str=':'.join(['disk_uuid', 'in', disks_uuid]))

        ret['data'] = rows

        return ret

    except ji.PreviewingError, e:
        return json.loads(e.message)


@Utils.dumps2response
def r_convert_to_os_template_image(snapshot_id, disk_uuid):

    args_rules = [
        Rules.SNAPSHOT_ID.value,
        Rules.DISK_UUID.value,
        Rules.LABEL.value
    ]

    try:
        ret = dict()
        ret['state'] = ji.Common.exchange_state(20000)

        ji.Check.previewing(args_rules, {'snapshot_id': snapshot_id, 'disk_uuid': disk_uuid,
                                         'label': request.json.get('label')})

        rows, _ = SnapshotDiskMapping.get_by_filter(filter_str=':'.join(['snapshot_id', 'eq', snapshot_id]))

        disks_uuid = list()

        for row in rows:
            disks_uuid.append(row['disk_uuid'])

        if disk_uuid not in disks_uuid:
            ret['state'] = ji.Common.exchange_state(40401)
            ret['state']['sub']['zh-cn'] = ''.join([ret['state']['sub']['zh-cn'], u': 未在快照: ',
                                                    snapshot_id, u' 中找到磁盘：', disk_uuid])
            return ret

        config = Config()
        config.id = 1
        config.get()

        snapshot = Snapshot()
        os_template_image = OSTemplateImage()
        guest = Guest()
        disk = Disk()

        snapshot.snapshot_id = snapshot_id
        snapshot.get_by('snapshot_id')
        snapshot.progress = 252

        guest.uuid = snapshot.guest_uuid
        guest.get_by('uuid')

        disk.uuid = disk_uuid
        disk.get_by('uuid')

        os_template_image.id = guest.os_template_image_id
        os_template_image.get()

        image_name = '_'.join([snapshot.snapshot_id, disk.uuid]) + '.' + disk.format

        os_template_image.id = 0
        os_template_image.label = request.json.get('label')
        os_template_image.path = '/'.join([os.path.dirname(os_template_image.path), image_name])
        os_template_image.kind = OSTemplateImageKind.custom.value
        os_template_image.progress = 0
        os_template_image.create_time = ji.Common.tus()

        if os_template_image.exist_by('path'):
            ret['state'] = ji.Common.exchange_state(40901)
            ret['state']['sub']['zh-cn'] = ''.join([ret['state']['sub']['zh-cn'], ': ', os_template_image.path])
            return ret

        os_template_image.create()
        os_template_image.get_by('path')

        message = {
            '_object': 'snapshot',
            'action': 'convert',
            'uuid': disk.guest_uuid,
            'snapshot_id': snapshot.snapshot_id,
            'storage_mode': config.storage_mode,
            'dfs_volume': config.dfs_volume,
            'node_id': disk.node_id,
            'snapshot_path': disk.path,
            'template_path': os_template_image.path,
            'os_template_image_id': os_template_image.id,
            'passback_parameters': {'id': snapshot.snapshot_id, 'os_template_image_id': os_template_image.id}
        }

        Utils.emit_instruction(message=json.dumps(message, ensure_ascii=False))

        snapshot.update()

        return ret

    except ji.PreviewingError, e:
        return json.loads(e.message)


@Utils.dumps2response
def r_show():
    args = list()
    page = int(request.args.get('page', 1))
    page_size = int(request.args.get('page_size', 10))
    keyword = request.args.get('keyword', None)
    order_by = request.args.get('order_by', None)
    order = request.args.get('order', 'desc')

    if page is not None:
        args.append('page=' + page.__str__())

    if page_size is not None:
        args.append('page_size=' + page_size.__str__())

    if keyword is not None:
        args.append('keyword=' + keyword.__str__())

    if order_by is not None:
        args.append('order_by=' + order_by)

    if order is not None:
        args.append('order=' + order)

    snapshots_url = url_for('api_snapshots.r_get_by_filter', _external=True)
    if keyword is not None:
        snapshots_url = url_for('api_snapshots.r_content_search', _external=True)

    if args.__len__() > 0:
        snapshots_url = snapshots_url + '?' + '&'.join(args)

    snapshots_ret = requests.get(url=snapshots_url, cookies=request.cookies)
    snapshots_ret = json.loads(snapshots_ret.content)

    guests_uuid = list()

    for snapshot in snapshots_ret['data']:
        guests_uuid.append(snapshot['guest_uuid'])

    guests, _ = Guest.get_by_filter(filter_str='uuid:in:' + ','.join(guests_uuid))

    # Guest uuid 与 Guest 的映射
    guests_mapping_by_uuid = dict()
    for guest in guests:
        guests_mapping_by_uuid[guest['uuid']] = guest

    for i, snapshot in enumerate(snapshots_ret['data']):
        if snapshot['guest_uuid'].__len__() == 36:
            snapshots_ret['data'][i]['guest'] = guests_mapping_by_uuid[snapshot['guest_uuid']]

    last_page = int(ceil(1 / float(page_size)))
    page_length = 5
    pages = list()
    if page < int(ceil(page_length / 2.0)):
        for i in range(1, page_length + 1):
            pages.append(i)
            if i == last_page or last_page == 0:
                break

    elif last_page - page < page_length / 2:
        for i in range(last_page - page_length + 1, last_page + 1):
            if i < 1:
                continue
            pages.append(i)

    else:
        for i in range(page - page_length / 2, page + int(ceil(page_length / 2.0))):
            pages.append(i)
            if i == last_page or last_page == 0:
                break

    ret = dict()
    ret['state'] = ji.Common.exchange_state(20000)

    ret['data'] = {
        'snapshots': snapshots_ret['data'],
        'paging': snapshots_ret['paging'],
        'guests_mapping_by_uuid': guests_mapping_by_uuid,
        'page': page,
        'page_size': page_size,
        'keyword': keyword,
        'pages': pages,
        'last_page': last_page,
        'order_by': order_by,
        'order': order
    }

    return ret