# -*- coding: utf-8 -*-
import json
import hashlib
import os
import unicodedata

from sqlalchemy.orm import load_only
from sqlalchemy.sql.expression import text
from sqlalchemy import func

from oxtornado import actions
import utils  # utils must be imported before websocket to avoid loop
from websocket import trigger_event
import meta
from . import models
from . import query
import settings
import state

from . import person_api
from . import title_api

import logging
logger = logging.getLogger(__name__)


def find(data):
    '''
        takes {
            query {
                conditions [{}]
                operator   string
            }
            group string
            keys  [string]
            sort  [{}]
            range [int, int]
        }
    '''
    response = {}
    q = query.parse(data)
    if 'group' in q:
        names = {}
        groups = {}
        sortvalues = {}
        _keydata = data.copy()
        for key in ('range', 'position', 'positions'):
            if key in _keydata:
                del _keydata[key]
        key = 'group:' + hashlib.sha1(json.dumps(_keydata, sort_keys=True).encode('utf-8')).hexdigest()
        g = state.cache.get(key)
        if g is None:
            state.cache.lock(key)
            if data.get('query', {}).get('conditions'):
                items = q['qs'].options(load_only('id'))
            else:
                items = None
            qs = models.Find.query.filter_by(key=q['group'])
            if items is None or items.first():
                if items is not None:
                    qs = qs.filter(models.Find.item_id.in_(items))
                values = list(qs.values('value', 'findvalue', 'sortvalue'))
                for f in values:
                    value = f[0]
                    findvalue = f[1]
                    sortvalue = f[2]
                    if findvalue not in groups:
                        groups[findvalue] = 0
                    groups[findvalue] += 1
                    names[findvalue] = value
                    sortvalues[value] = sortvalue
                g = [{'name': names[k], 'items': groups[k]} for k in groups]
            else:
                g = []
            if 'sort' in q:
                reverse = q['sort'][0]['operator'] == '-'
                def _sort_key(k):
                    name = sortvalues[k['name']]
                    if not name:
                        name = '\uffff' if not reverse else ''
                    items = k['items']
                    if q['sort'][0]['key'] == 'name':
                        v = (name, items)
                    else:
                        v = (-items, name)
                    return v
                if q['sort'][0]['key'] == 'items':
                    reverse = not reverse
                g.sort(key=_sort_key, reverse=reverse)
            state.cache.set(key, g)
        if 'positions' in data:
            response['positions'] = {}
            ids = [k['name'] for k in g]
            response['positions'] = utils.get_positions(ids, data['positions'])
        elif 'range' in data:
            response['items'] = g[q['range'][0]:q['range'][1]]
        else:
            response['items'] = len(g)
    elif 'position' in data:
        ids = [i.id for i in q['qs'].options(load_only('id'))]
        response['position'] = utils.get_positions(ids, [data['qs'][0].id])[0]
    elif 'positions' in data:
        ids = [i.id for i in q['qs'].options(load_only('id'))]
        response['positions'] = utils.get_positions(ids, data['positions'])
    elif 'keys' in data:
        response['items'] = [
            i.json(data['keys']) for i in q['qs'][q['range'][0]:q['range'][1]]
        ]
    else:
        size = [i.info.get('size', 0) for i in q['qs'].options(load_only('id', 'info'))]
        response['items'] = len(size)
        response['size'] = sum(size)
    return response
actions.register(find)
actions.register(find, version='public')


def get(data):
    '''
        takes {
            id
            keys
        }
    '''
    response = {}
    item = models.Item.get(data['id'])
    if item:
        response = item.json(data['keys'] if 'keys' in data else None)
    return response
actions.register(get)
actions.register(get, version='public')


def edit(data):
    '''
        takes {
            id
            ...
        }
        setting identifier or base metadata is possible not both at the same time

        id can be one id or list of ids
    '''
    response = {}
    ids = data['id']
    if isinstance(ids, str):
        ids = [ids]
    edited = []
    for id in ids:
        state.db.session.begin(subtransactions=True)
        item = models.Item.get(id, for_update=True)
        if item and item.json().get('mediastate') == 'available':
            item.edit(data)
            response = item.json()
            edited.append(id)
        else:
            logger.info('can only edit available items %s', id)
        state.db.session.commit()
    if len(ids) > 1:
        response = data
        response['id'] = edited
    state.cache.clear('group:')
    return response
actions.register(edit, cache=False)


def remove(data):
    '''
        takes {
            id
        }
    '''
    if 'ids' in data and data['ids']:
        for i in models.Item.query.filter(models.Item.id.in_(data['ids'])):
            logger.info('remove item %s', i)
            i.remove_file()
    state.cache.clear('group:')
    return {
        'items': []
    }
actions.register(remove, cache=False)

def autocomplete(data):
    '''
        takes {
            key: string,
            value: string,
            operator: string // '=', '==', '^', '$'
            query: object // item query to limit results
            range: [int, int]
        }
        returns {
            items: [string, ...] //array of matching values
        }
    '''
    response = {}
    response['items'] = []
    if not 'range' in data:
        data['range'] = [0, 10]
    op = data.get('operator', '=')

    key = utils.get_by_id(settings.config['itemKeys'], data['key'])
    order_by = key.get('autocompleteSort', False)
    add_itemsort = False
    if order_by:
        for o in order_by:
            if o['operator'] != '-': o['operator'] = '' 
        order_by = [text('%(operator)ssort.%(key)s' % o) for o in order_by]
        add_itemsort = True
    else:
        order_by = [text('-items')]

    items = query.parse({'query': data.get('query', {})})['qs'].options(load_only('id'))
    qs = state.db.session.query(models.Find.value, func.count(models.Find.value).label('items'))
    qs = qs.filter(models.Find.item_id.in_(items))
    if data['value']:
        value = data['value'].lower()
        value = unicodedata.normalize('NFKD', value)
        qs = qs.filter(models.Find.key.is_(data['key']))
        if op == '=':
            qs = qs.filter(models.Find.findvalue.contains(value))
        elif op == '==':
            qs = qs.filter(models.Find.findvalue.is_(value))
        elif op == '^':
            qs = qs.filter(models.Find.findvalue.startswith(value))
        elif op == '$':
            qs = qs.filter(models.Find.findvalue.endswith(value))
    if add_itemsort:
        qs = qs.join(models.Item).join(models.Sort)
    qs = qs.group_by(models.Find.findvalue)
    qs = qs.order_by(*order_by)
    response['items'] = [r.value for r in qs[data['range'][0]:data['range'][1]]]
    return response
actions.register(autocomplete)

def findMetadata(data):
    '''
        takes {
            key: value,
        }
        returns {
            items: [{
                key: value
            }]
        }
        key is one of the supported identifiers: isbn10, isbn13...
    '''
    response = {
        'items': []
    }
    key = ','.join(sorted(data))
    if key == 'isbn':
        r = meta.lookup_isbn(data[key])
        if r:
            response['items'].append(r)
    elif key == 'author,title':
        response['items'] = meta.find(**data)
    elif key == 'id':
        import user.models
        items = {}
        value = data[key]
        for u in user.models.User.query.filter_by(peered=True):
            peer = utils.get_peer(u.id)
            if value in peer.library:
                h = peer.get_metahash(value)
                if h not in items:
                    items[h] = peer.library[value].get('meta', {}).copy()
                    items[h]['users'] = [u.id]
                    j = items[h]
                    for key_ in [k['id'] for k in settings.config['itemKeys'] if isinstance(k['type'], list)]:
                        if key_ in j and not isinstance(j[key_], list):
                            j[key_] = [j[key_]] if j[key_] else []
                else:
                    items[h]['users'].append(u.id)
        response['items'] = list(items.values())
    return response
actions.register(findMetadata)


def cancelDownloads(data):
    '''
        takes {
            ids
        }
    '''
    response = {}
    ids = data['ids']
    if ids:
        for item in models.Item.query.filter(models.Item.id.in_(ids)):
            t = state.downloads.transfers.get(item.id)
            if t:
                del state.downloads.transfers[item.id]
            p = state.user()
            if p in item.users:
                item.users.remove(p)
            for l in item.lists.filter_by(user_id=settings.USER_ID):
                l.items.remove(item)
            item.update()
            trigger_event('transfer', {
                'id': item.id, 'progress': -1
            })
        response = {'cancelled': ids}
    return response
actions.register(cancelDownloads, cache=False)


def scan(data):
    state.tasks.queue('scan', {})
    return {}
actions.register(scan, cache=False)

def export(data):
    '''
        takes {
            path absolute path to import
            list listename (add new items to this list)
            mode add|replace
        }
    '''
    import user.models
    l = user.models.List.get(':' + data['list'])
    if l:
        data['list'] = ':' + data['list']
        state.tasks.queue('export', data)
        response = {'status': 'ok'}
    else:
        response = {'status': 'invalid list'}
    return response
actions.register(export, cache=False)

def _import(data):
    '''
        takes {
            path absolute path to import
            list listename (add new items to this list)
            mode copy|move
        }
    '''
    if os.path.exists(data['path']):
        state.activity = {
            'activity': 'import',
            'path': data['path'],
        }
        state.tasks.queue('import', data)
    return {}
actions.register(_import, 'import', cache=False)


def cancelImport(data):
    state.activity['cancel'] = True
    trigger_event('activity', {
        'activity': 'import',
        'progress': [0, 0],
        'status': {'code': 200, 'text': 'canceled'}
    })
    return {}
actions.register(cancelImport, cache=False)

def openFile(data):
    response = {}
    item = models.Item.get(data['id'])
    if item:
        path = item.get_path()
        if path:
            utils.open_file(path)
    return response
actions.register(openFile, cache=False)

def openFolder(data):
    response = {}
    item = models.Item.get(data['id'])
    if item:
        path = item.get_path()
        if path:
            utils.open_folder(path=path)
    return response
actions.register(openFolder, cache=False)