# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
from datetime import datetime
from io import BytesIO
import base64
import hashlib
import os
import re
import shutil
import unicodedata

from PIL import Image
import ox
import sqlalchemy as sa

from changelog import Changelog
from db import MutableDict
import json_pickler
from .icons import icons
from .person import get_sort_name
from queryparser import Parser
from settings import config
from utils import remove_empty_folders
from websocket import trigger_event
import db
import media
#import metaremote as meta
import meta
import settings
import state
import utils

import logging
logger = logging.getLogger(__name__)

user_items = sa.Table('useritem', db.metadata,
    sa.Column('user_id', sa.String(43), sa.ForeignKey('user.id')),
    sa.Column('item_id', sa.String(32), sa.ForeignKey('item.id'))
)

class Item(db.Model):
    __tablename__ = 'item'

    created = sa.Column(sa.DateTime())
    modified = sa.Column(sa.DateTime())

    id = sa.Column(sa.String(32), primary_key=True)

    info = sa.Column(MutableDict.as_mutable(sa.PickleType(pickler=json_pickler)))
    meta = sa.Column(MutableDict.as_mutable(sa.PickleType(pickler=json_pickler)))

    # why is this in db and not in i.e. info?
    added = sa.Column(sa.DateTime()) # added to local library
    accessed = sa.Column(sa.DateTime())
    timesaccessed = sa.Column(sa.Integer())

    users = sa.orm.relationship('User', secondary=user_items,
        backref=sa.orm.backref('items', lazy='dynamic'))

    @property
    def timestamp(self):
        return utils.datetime2ts(self.modified)

    def __repr__(self):
        return self.id

    def __init__(self, id):
        if isinstance(id, list):
            id = base64.b32encode(hashlib.sha1(''.join(id)).digest())
        self.id = id
        self.created = datetime.utcnow()
        self.modified = datetime.utcnow()
        self.info = {}
        self.meta = {}

    @classmethod
    def get(cls, id):
        if isinstance(id, list):
            id = base64.b32encode(hashlib.sha1(''.join(id)).digest())
        return cls.query.filter_by(id=id).first()

    @classmethod
    def get_or_create(cls, id, info=None):
        if isinstance(id, list):
            id = base64.b32encode(hashlib.sha1(''.join(id)).digest())
        item = cls.query.filter_by(id=id).first()
        if not item:
            item = cls(id=id)
            if info:
                item.info = info
            state.db.session.add(item)
            state.db.session.commit()
        return item

    @classmethod
    def find(cls, data):
        return Parser(cls, user_items, Find, Sort).find(data)

    def add_user(self, user):
        if not user in self.users:
            self.users.append(user)
        l = user.library
        if not self in l.items:
            l.items.append(self)
            state.db.session.add(l)

    def json(self, keys=None):
        j  = {}
        j['id'] = self.id
        j['created'] = self.created
        j['modified'] = self.modified
        j['timesaccessed'] = self.timesaccessed
        j['accessed'] = self.accessed
        j['added'] = self.added
        t = Transfer.get(self.id)
        if t:
            j['transferadded'] = t.added
            j['transferprogress'] = t.progress

        # unused and slow
        #j['users'] = list(map(str, list(self.users)))

        if self.info:
            for key in self.info:
                if (not keys or key in keys) and key not in self.meta_keys:
                    j[key] = self.info[key]

        if self.meta:
            j.update(self.meta)

        for key in self.id_keys:
            if key not in self.meta and key in j:
                del j[key]
        if keys:
            for k in list(j):
                if k not in keys:
                    del j[k]
        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]]
        return j

    def get_path(self):
        f = self.files.first()
        return f.fullpath() if f else None

    def update_sort(self):
        update = False
        s = Sort.get_or_create(self.id)
        for key in config['itemKeys']:
            if key.get('sort'):
                value = self.json().get(key['id'], None)
                sort_type = key.get('sortType', key['type'])
                if value:
                    if sort_type == 'integer':
                        if isinstance(value, str):
                            value = int(re.sub('[^0-9]', '', value))
                        else:
                            value = int(value)
                    elif sort_type == 'float':
                        value = float(value)
                    elif sort_type == 'date':
                        pass
                    elif sort_type == 'person':
                        if not isinstance(value, list):
                            value = [value]
                        value = list(map(get_sort_name, value))
                        value = ox.sort_string('\n'.join(value)).lower()
                    elif sort_type == 'title':
                        if isinstance(value, dict):
                            value = list(value.values())
                        if isinstance(value, list):
                            value = ''.join(value)
                        value = ox.get_sort_title(value)
                        value = utils.sort_title(value).lower()
                    else:
                        if isinstance(value, list):
                            value = '\n'.join(value)
                        if value:
                            value = str(value)
                            value = ox.sort_string(value).lower()
                elif isinstance(value, list): #empty list
                    value = ''
                if getattr(s, key['id']) != value:
                    setattr(s, key['id'], value)
                    update = True
        if update:
            state.db.session.add(s)

    def update_find(self):

        def add(k, v):
            f = Find.query.filter_by(item_id=self.id, key=k, value=v).first()
            if not f:
                f = Find(item_id=self.id, key=k)
            if f.value != v:
                f.findvalue = unicodedata.normalize('NFKD', v).lower()
                f.value = v
                state.db.session.add(f)

        keys = []
        for key in config['itemKeys']:
            if key.get('find') or key.get('filter') or key.get('type') in [['string'], 'string']:
                value = self.json().get(key['id'], None)
                if key.get('filterMap') and value:
                    value = re.compile(key.get('filterMap')).findall(value)
                    if value: value = value[0]
                if value:
                    keys.append(key['id'])
                    if isinstance(value, dict):
                        value = ' '.join(list(value.values()))
                    if not isinstance(value, list):
                        value = [value]
                    value = [
                        v.decode('utf-8') if isinstance(v, bytes) else v
                        for v in value
                    ]
                    for v in value:
                        add(key['id'], v)
                    for f in Find.query.filter_by(item_id=self.id,
                            key=key['id']).filter(Find.value.notin_(value)):
                        state.db.session.delete(f)
        for f in Find.query.filter_by(item_id=self.id).filter(Find.key.notin_(keys)):
            state.db.session.delete(f)

    def update(self, modified=None):
        for key in ('mediastate', 'coverRatio', 'previewRatio'):
            if key in self.meta:
                if key not in self.info:
                    self.info[key] = self.meta[key]
                del self.meta[key]
        users = list(map(str, list(self.users)))
        self.info['mediastate'] = 'available' # available, unavailable, transferring
        t = Transfer.get(self.id)
        if t and t.added and t.progress < 1:
            self.info['mediastate'] = 'transferring'
        else:
            self.info['mediastate'] = 'available' if settings.USER_ID in users else 'unavailable'
        if modified:
            self.modified = modified
        else:
            self.modified = datetime.utcnow()
        self.update_sort()
        self.update_find()
        self.save()

    def save(self):
        state.db.session.add(self)
        state.db.session.commit()

    def delete(self, commit=True):
        Sort.query.filter_by(item_id=self.id).delete()
        Transfer.query.filter_by(item_id=self.id).delete()
        Scrape.query.filter_by(item_id=self.id).delete()
        state.db.session.delete(self)
        if commit:
            state.db.session.commit()

    meta_keys = (
        'author',
        'categories',
        'cover',
        'date',
        'description',
        'edition',
        'isbn',
        'language',
        'pages',
        'place',
        'publisher',
        'series',
        'tableofcontents',
        'title'
    )

    def update_meta(self, data, modified=None, reset_from=False):
        update = False
        record = {}
        for key in self.meta_keys:
            if key in data:
                if self.meta.get(key) != data[key]:
                    record[key] = data[key]
                    self.meta[key] = data[key]
                    update = True
        for key in list(self.meta):
            if key not in self.meta_keys:
                del self.meta[key]
                update = True
        if reset_from and '_from' in self.info:
            del self.info['_from']
            update = True
        if update:
            self.update(modified)
            self.save()
            if 'cover' in record:
                self.update_icons()
            user = state.user()
            if record and user in self.users:
                Changelog.record_ts(user, modified, 'edititem', self.id, record)

    def edit(self, data, modified=None, reset_from=False):
        Scrape.query.filter_by(item_id=self.id).delete()
        self.update_meta(data, modified, reset_from=reset_from)
        for f in self.files.all():
            f.move()

    def extract_preview(self):
        path = self.get_path()
        if path:
            return getattr(media, self.info['extension']).cover(path)

    def update_icons(self):
        def get_ratio(data):
            try:
                img = Image.open(BytesIO(data))
                return img.size[0]/img.size[1]
            except:
                return 1
        key = 'cover:%s'%self.id
        cover = None
        if 'cover' in self.meta and self.meta['cover']:
            try:
                cover = ox.cache.read_url(self.meta['cover'])
            except:
                logger.debug('unable to read cover url %s', self.meta['cover'])
                cover = None
            if cover:
                icons[key] = cover
                self.info['coverRatio'] = get_ratio(cover)
        else:
            del icons[key]
        key = 'preview:%s'%self.id
        preview = self.extract_preview()
        if preview:
            icons[key] = preview
            self.info['previewRatio'] = get_ratio(preview)
            if not cover:
                self.info['coverRatio'] = self.info['previewRatio']
        else:
            del icons[key]
            if 'previewRatio' in self.info:
                del self.info['previewRatio']
            if not cover and 'coverRatio' in self.info:
                del self.info['coverRatio']
        if cover and not preview:
            self.info['previewRatio'] = self.info['coverRatio']
        for key in ('cover', 'preview'):
            key = '%s:%s' % (key, self.id)
            for resolution in (128, 256, 512):
                del icons['%s:%s' % (key, resolution)]

    def load_metadata(self):
        '''
            load metadata from user_metadata or get via isbn?
        '''
        for key in self.meta_keys:
            if key in self.info:
                if key not in self.meta:
                    self.meta[key] = self.info[key]
                del self.info[key]

        #FIXME get from user_meta
        if state.online:
            if 'isbn' in self.meta:
                data = meta.lookup('isbn', self.meta['isbn'])
                if data:
                    self.meta.update(data)

    def queue_download(self):
        u = state.user()
        if not u in self.users:
            t = Transfer.get_or_create(self.id)
            logger.debug('queue %s for download', self.id)
            self.add_user(u)

    def save_file(self, content):
        u = state.user()
        f = File.get(self.id)
        content_id = media.get_id(data=content)
        if content_id != self.id:
            logger.debug('INVALID CONTENT %s vs %s', self.id, content_id)
            return False
        if not f:
            path = 'Downloads/%s.%s' % (self.id, self.info['extension'])
            info = self.info.copy()
            for key in ('mediastate', 'coverRatio', 'previewRatio'):
                if key in info:
                    del info[key]
            f = File.get_or_create(self.id, info, path=path)
            path = self.get_path()
            if not os.path.exists(path):
                ox.makedirs(os.path.dirname(path))
                with open(path, 'wb') as fd:
                    fd.write(content)
                f.info = media.metadata(path)
                f.save()
                edititem = False
                for key in ('tableofcontents', ):
                    if key not in self.meta and key in f.info:
                        self.meta[key] = f.info[key]
                        edititem = True
                if u not in self.users:
                    self.add_user(u)
                t = Transfer.get_or_create(self.id)
                t.progress = 1
                t.save()
                self.added = datetime.utcnow()
                Changelog.record(u, 'additem', self.id, f.info)
                if edititem:
                    Changelog.record(u, 'edititem', self.id, self.meta)
                self.update()
                f.move()
                self.update_icons()
                self.save()
                trigger_event('transfer', {
                    'id': self.id, 'progress': 1
                })
                return True
        else:
            logger.debug('TRIED TO SAVE EXISTING FILE!!!')
            t = Transfer.get_or_create(self.id)
            t.progress = 1
            t.save()
            self.update()
        return False

    def remove_file(self):
        for f in self.files.all():
            path = f.fullpath()
            if os.path.exists(path):
                os.unlink(path)
                remove_empty_folders(os.path.dirname(path))
            state.db.session.delete(f)
        user = state.user()
        if user in self.users:
            self.users.remove(user)
        for l in self.lists.filter_by(user_id=user.id):
            l.items.remove(self)
        if not self.users:
            self.delete()
        else:
            self.update()
        Transfer.query.filter_by(item_id=self.id).delete()
        Changelog.record(user, 'removeitem', self.id)

class Sort(db.Model):
    __tablename__ = 'sort'

    item_id = sa.Column(sa.String(32), sa.ForeignKey('item.id'), primary_key=True)
    item = sa.orm.relationship('Item', backref=sa.orm.backref('sort', lazy='dynamic'))

    def __repr__(self):
        return '%s_sort' % self.item_id

    @classmethod
    def get(cls, item_id):
        return cls.query.filter_by(item_id=item_id).first()

    @classmethod
    def get_or_create(cls, item_id):
        f = cls.get(item_id)
        if not f:
            f = cls(item_id=item_id)
            state.db.session.add(f)
            state.db.session.commit()
        return f

for key in config['itemKeys']:
    if key.get('sort'):
        sort_type = key.get('sortType', key['type'])
        if sort_type == 'integer':
            col = sa.Column(sa.BigInteger(), index=True)
        elif sort_type == 'float':
            col = sa.Column(sa.Float(), index=True)
        elif sort_type == 'date':
            col = sa.Column(sa.DateTime(), index=True)
        else:
            col = sa.Column(sa.String(1000), index=True)
        setattr(Sort, '%s' % key['id'], col)

Item.id_keys = ['isbn', 'lccn', 'olid', 'oclc', 'asin']
Item.item_keys = config['itemKeys'] 
Item.filter_keys = [k['id'] for k in config['itemKeys'] if k.get('filter')]

class Find(db.Model):
    __tablename__ = 'find'

    id = sa.Column(sa.Integer(), primary_key=True)
    item_id = sa.Column(sa.String(32), sa.ForeignKey('item.id'))
    item = sa.orm.relationship('Item', backref=sa.orm.backref('find_', lazy='dynamic'))
    key = sa.Column(sa.String(200), index=True)
    value = sa.Column(sa.Text())
    findvalue = sa.Column(sa.Text(), index=True)

    def __repr__(self):
        return '%s=%s' % (self.key, self.findvalue)

    @classmethod
    def get(cls, item, key):
        return cls.query.filter_by(item_id=item, key=key).first()

    @classmethod
    def get_or_create(cls, item, key):
        f = cls.get(item, key)
        if not f:
            f = cls(item_id=item, key=key)
            state.db.session.add(f)
            state.db.session.commit()
        return f

class File(db.Model):
    __tablename__ = 'file'

    created = sa.Column(sa.DateTime())
    modified = sa.Column(sa.DateTime())

    sha1 = sa.Column(sa.String(32), primary_key=True)
    path = sa.Column(sa.String(2048))

    info = sa.Column(MutableDict.as_mutable(sa.PickleType(pickler=json_pickler)))

    item_id = sa.Column(sa.String(32), sa.ForeignKey('item.id'))
    item = sa.orm.relationship('Item', backref=sa.orm.backref('files', lazy='dynamic'))

    @classmethod
    def get(cls, sha1):
        return cls.query.filter_by(sha1=sha1).first()

    @classmethod
    def get_or_create(cls, sha1, info=None, path=None):
        f = cls.get(sha1)
        if not f:
            f = cls(sha1=sha1)
            if info:
                f.info = info
            if path:
                f.path = path
            f.item_id = Item.get_or_create(id=sha1, info=info).id
            state.db.session.add(f)
            state.db.session.commit()
        return f

    def __repr__(self):
        return self.sha1

    def __init__(self, sha1):
        self.sha1 = sha1
        self.created = datetime.utcnow()
        self.modified = datetime.utcnow()

    def fullpath(self):
        prefs = settings.preferences
        prefix = os.path.join(os.path.expanduser(prefs['libraryPath']), 'Books/')
        return os.path.join(prefix, self.path)

    def move(self):
        def format_underscores(string):
            return re.sub('^\.|\.$|:|/|\?|<|>', '_', string)
        prefs = settings.preferences
        prefix = os.path.join(os.path.expanduser(prefs['libraryPath']), 'Books/')
        j = self.item.json()

        current_path = self.fullpath()
        if not os.path.exists(current_path):
            logger.debug('file is missing. %s', current_path)
            return
        author = '; '.join([get_sort_name(a) for a in j.get('author', [])])
        if not author:
            author = 'Unknown Author'
        title = j.get('title', 'Untitled')
        extension = j['extension']

        if len(title) > 100:
            title = title[:100]

        title = format_underscores(title)
        author = format_underscores(author)
        publisher = j.get('publisher')
        if publisher:
            extra = ', '.join(publisher)
        else:
            extra = ''
        date = j.get('date')
        if date and len(date) >= 4:
            extra += ' ' + date[:4]
        if extra:
            title = '%s (%s)' % (title, extra.strip())
        filename = '%s.%s' % (title, extension)
        first = unicodedata.normalize('NFD', author[0].upper())[0].upper()
        new_path = os.path.join(first, author, filename)
        new_path = new_path.replace('\x00', '')
        new_path = ox.decode_html(new_path)
        if self.path == new_path:
            return
        h = ''
        while os.path.exists(os.path.join(prefix, new_path)):
            h = self.sha1[:len(h)+1]
            filename = '%s.%s.%s' % (title, h, extension)
            first = unicodedata.normalize('NFD', author[0].upper())[0].upper()
            new_path = os.path.join(first, author, filename)
            if current_path == os.path.join(prefix, new_path):
                break
        if self.path != new_path:
            path = os.path.join(prefix, new_path)
            ox.makedirs(os.path.dirname(path))
            shutil.move(current_path, path)
            self.path = new_path
            self.save()

    def save(self):
        state.db.session.add(self)
        state.db.session.commit()

class Scrape(db.Model):

    __tablename__ = 'scrape'

    item_id = sa.Column(sa.String(32), sa.ForeignKey('item.id'), primary_key=True)
    item = sa.orm.relationship('Item', backref=sa.orm.backref('scraping', lazy='dynamic'))

    added = sa.Column(sa.DateTime())

    def __repr__(self):
        return '='.join(map(str, [self.item_id, self.added]))

    @classmethod
    def get(cls, item_id):
        return cls.query.filter_by(item_id=item_id).first()

    @classmethod
    def get_or_create(cls, item_id):
        t = cls.get(item_id)
        if not t:
            t = cls(item_id=item_id)
            t.added = datetime.utcnow()
            t.save()
        return t

    def save(self):
        state.db.session.add(self)
        state.db.session.commit()

    def remove(self):
        state.db.session.delete(self)
        state.db.session.commit()

class Transfer(db.Model):
    __tablename__ = 'transfer'

    item_id = sa.Column(sa.String(32), sa.ForeignKey('item.id'), primary_key=True)
    item = sa.orm.relationship('Item', backref=sa.orm.backref('transfer', lazy='dynamic'))

    added = sa.Column(sa.DateTime())
    progress = sa.Column(sa.Float())

    def __repr__(self):
        return '='.join(map(str, [self.item_id, self.progress]))

    @classmethod
    def get(cls, item_id):
        return cls.query.filter_by(item_id=item_id).first()

    @classmethod
    def get_or_create(cls, item_id):
        t = cls.get(item_id)
        if not t:
            t = cls(item_id=item_id)
            t.added = datetime.utcnow()
            t.progress = 0
            t.save()
        return t

    def save(self):
        state.db.session.add(self)
        state.db.session.commit()

class Metadata(db.Model):
    __tablename__ = 'metadata'

    created = sa.Column(sa.DateTime())
    modified = sa.Column(sa.DateTime())

    id = sa.Column(sa.Integer(), primary_key=True)

    key = sa.Column(sa.String(256))
    value = sa.Column(sa.String(256))

    data = sa.Column(MutableDict.as_mutable(sa.PickleType(pickler=json_pickler)))

    def __repr__(self):
        return '='.join([self.key, self.value])

    @property
    def timestamp(self):
        return utils.datetime2ts(self.modified)

    @classmethod
    def get(cls, key, value):
        return cls.query.filter_by(key=key, value=value).first()

    @classmethod
    def get_or_create(cls, key, value):
        m = cls.get(key, value)
        if not m:
            m = cls(key=key, value=value)
            m.created = datetime.utcnow()
            m.data = {}
            m.save()
        return m

    def save(self):
        self.modified = datetime.utcnow()
        state.db.session.add(self)
        state.db.session.commit()

    def reset(self):
        user = state.user()
        Changelog.record(user, 'resetmeta', self.key, self.value)
        state.db.session.delete(self)
        state.db.session.commit()
        self.update_items()

    def edit(self, data, record=True):
        changed = {}
        for key in data:
            if key == 'id':
                continue
            if data[key] != self.data.get(key):
                self.data[key] = data[key]
                changed[key] = data[key]
        if changed:
            self.save()
            if record:
                user = state.user()
                Changelog.record(user, 'editmeta', self.key, self.value, changed)
        return changed

    def update_items(self):
        for f in Find.query.filter_by(key=self.key, value=self.value):
            if f.item:
                f.item.update()

    @classmethod
    def load(self, key, value):
        m = self.get(key, value)
        if m:
            if 'id' in m.data:
                del m.data['id']
            return m.data
        return {}