# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
from __future__ import division

from datetime import datetime
import os
import shutil
import time

import ox

from changelog import Changelog
from item.models import File
from user.models import List
from utils import remove_empty_folders
from websocket import trigger_event
import db
import media
import settings
import state

import logging
logger = logging.getLogger('oml.item.scan')

extensions = ['epub', 'pdf', 'txt']

def remove_missing():
    dirty = False
    with db.session():
        prefs = settings.preferences
        prefix = os.path.join(os.path.expanduser(prefs['libraryPath']), 'Books/')
        if os.path.exists(prefix):
            for f in File.query:
                path = f.item.get_path()
                if not os.path.exists(path):
                    dirty = True
                    f.item.remove_file()
            if dirty:
                state.db.session.commit()

def add_file(id, f, prefix, from_=None):
    user = state.user()
    path = f[len(prefix):]
    data = media.metadata(f, from_)
    file = File.get_or_create(id, data, path)
    item = file.item
    if 'primaryid' in file.info:
        del file.info['primaryid']
        state.db.session.add(file)
    if 'primaryid' in item.info:
        item.meta['primaryid'] = item.info.pop('primaryid')
        state.db.session.add(item)
    item.users.append(user)
    Changelog.record(user, 'additem', item.id, file.info)
    if item.meta.get('primaryid'):
        Changelog.record(user, 'edititem', item.id, dict([item.meta['primaryid']]))
    item.added = datetime.utcnow()
    item.scrape()
    item.update_icons()
    item.save()
    return file

def run_scan():
    remove_missing()
    with db.session():
        prefs = settings.preferences
        prefix = os.path.join(os.path.expanduser(prefs['libraryPath']), 'Books/')
        if not prefix[-1] == '/':
            prefix += '/'
        assert isinstance(prefix, unicode)
        books = []
        for root, folders, files in os.walk(prefix):
            for f in files:
                #if f.startswith('._') or f == '.DS_Store':
                if f.startswith('.'):
                    continue
                f = os.path.join(root, f)
                ext = f.split('.')[-1]
                if ext in extensions:
                    books.append(f)

        position = 0
        added = 0
        for f in ox.sorted_strings(books):
            position += 1
            id = media.get_id(f)
            file = File.get(id)
            if not file:
                file = add_file(id, f, prefix, f)
                added += 1
                trigger_event('change', {})

def run_import(options=None):
    options = options or {}

    with db.session():
        prefs = settings.preferences
        prefix = os.path.expanduser(options.get('path', prefs['importPath']))
        if os.path.islink(prefix):
            prefix = os.path.realpath(prefix)
        if not prefix[-1] == '/':
            prefix += '/'
        prefix_books = os.path.join(os.path.expanduser(prefs['libraryPath']), 'Books/')
        prefix_imported = os.path.join(prefix_books, 'Imported/')
        if prefix_books.startswith(prefix) or prefix.startswith(prefix_books):
            error = 'invalid path'
        elif not os.path.exists(prefix):
            error = 'path not found'
        elif not os.path.isdir(prefix):
            error = 'path must be a folder'
        else:
            error = None
        if error:
            trigger_event('activity', {
                'activity': 'import',
                'progress': [0, 0],
                'status': {'code': 404, 'text': error}
            })
            state.activity = {}
            return
        listname = options.get('list')
        if listname:
            listitems = []
        assert isinstance(prefix, unicode)
        books = []
        count = 0
        for root, folders, files in os.walk(prefix):
            for f in files:
                #if f.startswith('._') or f == '.DS_Store':
                if f.startswith('.'):
                    continue
                f = os.path.join(root, f)
                ext = f.split('.')[-1]
                if ext in extensions:
                    books.append(f)
                    count += 1
                    if state.activity.get('cancel'):
                        state.activity = {}
                        return
                    if count % 1000 == 0:
                        state.activity = {
                            'activity': 'import',
                            'path': prefix,
                            'progress': [0, count],
                        }
                        trigger_event('activity', state.activity)
        state.activity = {
            'activity': 'import',
            'path': prefix,
            'progress': [0, len(books)],
        }
        trigger_event('activity', state.activity)
        position = 0
        added = 0
        last = 0
        for f in ox.sorted_strings(books):
            position += 1
            if not os.path.exists(f):
                continue
            id = media.get_id(f)
            file = File.get(id)
            if not file:
                f_import = f
                f = f.replace(prefix, prefix_imported)
                ox.makedirs(os.path.dirname(f))
                if options.get('mode') == 'move':
                    shutil.move(f_import, f)
                else:
                    shutil.copy(f_import, f)
                file = add_file(id, f, prefix_books, f_import)
                file.move()
                added += 1
            if listname:
                listitems.append(file.item.id)
            if time.time() - last > 5:
                last = time.time()
                state.activity = {
                    'activity': 'import',
                    'progress': [position, len(books)],
                    'path': prefix,
                    'added': added,
                }
                trigger_event('activity', state.activity)

            if state.activity.get('cancel'):
                state.activity = {}
                return
        if listname and listitems:
            l = List.get(settings.USER_ID, listname)
            if l:
                l.add_items(listitems)
        trigger_event('activity', {
            'activity': 'import',
            'progress': [position, len(books)],
            'path': prefix,
            'status': {'code': 200, 'text': ''},
            'added': added,
        })
        state.activity = {}
        remove_empty_folders(prefix_books)
        if options.get('mode') == 'move':
            remove_empty_folders(prefix)