# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4


from datetime import datetime
import os
import shutil
import stat
import time

import ox

from changelog import Changelog
from item.models import File, Item
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(__name__)

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

def remove_missing(books=None):
    dirty = False
    logger.debug('remove missing')
    prefix = get_prefix()
    if books is None:
        books = collect_books(prefix)
    with db.session():
        if os.path.exists(prefix):
            logger.debug('scan for removed files')
            db_paths = []
            items = {}
            for f in File.query:
                if state.shutdown:
                    return
                path = f.fullpath()
                db_paths.append(path)
                if f.item:
                    items[path] = f.sha1
                else:
                    state.db.session.delete(f)
                    dirty = True
            if dirty:
                state.db.session.commit()
                dirty = False
            removed = set(db_paths) - set(books)
            if removed:
                logger.debug('%s files removed', len(removed))
                ids = [items[path] for path in removed]
                orphaned = set(ids)
                for i in Item.query.filter(Item.id.in_(ids)):
                    i.remove_file()
                    orphaned.remove(i.id)
                    dirty = True
                if orphaned:
                    logger.debug('%s files orphaned', len(orphaned))
                    for f in File.query.filter(File.sha1.in_(orphaned)):
                        state.db.session.delete(f)
                    dirty = True
            if dirty:
                state.db.session.commit()
                state.cache.clear('group:')
            logger.debug('update filenames')
            for f in File.query:
                if state.shutdown:
                    return
                f.move()
            logger.debug('remove empty folders')
            remove_empty_folders(prefix, True)
    logger.debug('remove missing done')

def add_file(id, f, prefix, from_=None, commit=True):
    user = state.user()
    path = f[len(prefix):]
    logger.debug('%s extract metadata %s', id, path)
    data = media.metadata(f, from_)
    logger.debug('%s create file %s', id, path)
    file = File.get_or_create(id, data, path)
    item = file.item
    item.add_user(user)
    item.added = datetime.utcnow()
    logger.debug('%s load metadata %s', id, path)
    item.load_metadata()
    Changelog.record(user, 'additem', item.id, file.info)
    Changelog.record(user, 'edititem', item.id, item.meta)
    logger.debug('%s extract icons %s', id, path)
    item.update_icons()
    item.modified = datetime.utcnow()
    logger.debug('%s save item', id)
    item.update(commit=commit)
    logger.debug('%s added', id)
    return file

def get_prefix():
    prefs = settings.preferences
    prefix = os.path.join(os.path.expanduser(prefs['libraryPath']), 'Books' + os.sep)
    if not prefix[-1] == os.sep:
        prefix += os.sep
    assert isinstance(prefix, str)
    return prefix

def collect_books(prefix, status=None):
    logger.debug('collect books')
    books = []
    count = 0
    for root, folders, files in os.walk(prefix):
        for f in files:
            if state.shutdown:
                return []
            if f.startswith('.'):
                continue
            f = os.path.join(root, f)
            ext = f.split('.')[-1].lower()
            if ext == 'kepub':
                ext = 'epub'
            if ext in extensions:
                books.append(os.path.normpath(f))
                count += 1
            if status and not status(count):
                return None
    logger.debug('found %s books', len(books))
    return books

def run_scan():
    logger.debug('run_scan')
    prefix = get_prefix()
    books = collect_books(prefix)
    remove_missing(books)

    added = 0
    with db.session():
        for f in ox.sorted_strings(books):
            if state.shutdown:
                break
            if os.path.exists(f):
                id = media.get_id(f)
                file = File.get(id)
                if not file:
                    file = add_file(id, f, prefix, f)
                    added += 1
    if added:
        trigger_event('change', {})
        logger.debug('imported %s unknown books', added)

def change_path(old, new):
    new_books = os.path.join(new, 'Books')
    if not os.path.exists(new_books):
        ox.makedirs(new)
        shutil.move(os.path.join(old, 'Books'), new_books)
        remove_empty_folders(old)
    else:
        ox.makedirs(new_books)
    run_scan()
    trigger_event('change', {})

def run_import(options=None):
    options = options or {}
    logger.debug('run_import')
    if state.activity.get('cancel'):
        logger.debug('import canceled')
        state.activity = {}
        return
    state.activity = {}
    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] == os.sep:
        prefix += os.sep
    prefix_books = get_prefix()
    prefix_imported = os.path.join(prefix_books, '.import' + os.sep)
    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, str)
    books = []

    def activity(count):
        if count % 100 == 0:
            state.activity = {
                'activity': 'import',
                'path': prefix,
                'progress': [0, count],
            }
            trigger_event('activity', state.activity)
        if state.activity.get('cancel'):
            logger.debug('active import canceled')
            state.activity = {}
            return False
        return True
    books = collect_books(prefix, status=activity)
    if books is None:
        return
    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
        with db.session():
            id = media.get_id(f)
            file = File.get(id)
            f_import = f
            if not file:
                f = f.replace(prefix, prefix_imported)
                ox.makedirs(os.path.dirname(f))
                if options.get('mode') == 'move':
                    try:
                        shutil.move(f_import, f)
                    except:
                        shutil.copy2(f_import, f)
                else:
                    shutil.copy2(f_import, f)
                file = add_file(id, f, prefix_books, f_import)
                file.move()
                added += 1
            elif options.get('mode') == 'move':
                try:
                    os.chmod(f_import, stat.S_IWRITE)
                    os.unlink(f_import)
                except:
                    pass
            if listname:
                listitems.append(file.item.id)
        if state.activity.get('cancel'):
            state.activity = {}
            return
        if state.shutdown:
            return
        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 listname and listitems:
        with db.session():
            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, True)

def import_folder():
    if not (state.activity and state.activity.get('activity') == 'import'):
        import_path = settings.preferences['importPath']
        import_path = os.path.normpath(os.path.expanduser(import_path))
        import_path_base = os.path.dirname(import_path)
        if not os.path.exists(import_path) and os.path.exists(import_path_base):
            os.makedirs(import_path)
        logger.debug('scan importPath %s', import_path)
        if os.path.exists(import_path):
            run_import({
                'path': import_path,
                'mode': 'move'
            })
            remove_empty_folders(import_path, True)
    if state.main:
        state.main.call_later(10*60, lambda: state.tasks.queue('scanimport'))