import json
import os
import time
import asyncio

from base64 import b64decode, b64encode
from pathlib import Path

from backend.lib.config import Config

from django.conf import settings
from django.contrib import auth
from django.contrib.auth import authenticate, get_user_model, login, logout
from django.contrib.auth.models import User
from django.db import models
from django.http import JsonResponse
from django.shortcuts import HttpResponse, redirect, render  # render_to_response
from django.template.loader import render_to_string
from django.utils.datastructures import MultiValueDictKeyError
from django.utils.text import slugify

from .forms import SignUpForm, UserLoginForm
from .models import Books, Collections, Favorites, Navigation, User

config = Config(Path("../"))



def index(request, query=None, _set=1, _limit=None, _order='title'):
    """
    Return template index
    """
    _payload = payload(request, query, _set, _limit, _order)
    return render(
        request,
        "index.html",
        _payload
    )


def favorites(request, query=None, _set=1, _limit=None, _order='title'):
    """
    Return template index
    """
    _payload = payload(request, query, _set, _limit, _order, favorites=True, reset=True)
    return render(
        request,
        "index.html",
        _payload
    )


def collectionspage(request):

    pass


def signup(request):
    if request.method == 'POST':
        form = SignUpForm(request.POST)
        if form.is_valid():
            form.save()
            username = form.cleaned_data.get('username')
            raw_password = form.cleaned_data.get('password1')
            user = authenticate(username=username, password=raw_password)
            login(request, user)
            return redirect('home')
    else:
        form = SignUpForm()
    return render(request, 'signup.html', {'form': form})


def userlogin(request):

    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(request, username=username, password=password)
        if user is not None: 
            login(request, user)
            user.save()
            return redirect('home')
    form = UserLoginForm()
    return render(request, 'login.html', {'form': form})


def userlogout(request):
    logout(request)
    return redirect('home')


def home(request, query=None, _set=1, _limit=None, _order='title'): 
    """ 
    Reset Search Queries & Return Home
    """
    _payload = payload(request, query, _set, _limit, _order, reset=True)
    return render(
        request,
        "index.html",
        _payload
    )


def show_collection(request, query, _set, _limit=None, _order='title', **kwargs):
    try:
        _set = int(_set) + 1
    except Exception:
        _set = 1

    _set = int(_set)  # Get set #
    if _set < 1: _set = 1  # If there is no set data, set = 1
    if _limit is None: _limit = 20  # If we havent set limit limit = 20
    _set_max = int(_set) * _limit  # Multiply current set by limit to get upper limits
    _set_min = _set_max - _limit  #  Subtract limiter to get bottom limit
    _now_showing = "%s-%s"%(_set_min, _set_max)  # Set the set count
    if query:  # Are we sending a query?
        if query != request.session.get('cached_query'):  # Is it different to the last query?
            request.session['cached_query'] = query  # Set the session data to track the query
            if request.session['ascending']:
                _r = _results = Collections().generic_search(query)  # Get the query, or in reverse below
            else: _results = Collections().generic_search(query).reverse()
            _r, _r_len = \
                _results[_set_min:_set_max],\
                len(_results)
        elif query == request.session.get('cached_query'):  # The queries are equal check the direction
            if request.session['ascending']:
                _results = Collections().generic_search(query)
            else: _results = Collections().generic_search(query).reverse()
            _r, _r_len = \
                _results.order_by(_order)[_set_min:_set_max],\
                len(_results)
    else:
        try:
            query = request.session['cached_query']  # Is there a cached query?
            if query == None: raise KeyError
            if request.session['ascending']:
                _results = Collections().generic_search(query)
            else: _results = Collections().generic_search(query).reverse()
            _r, _r_len = \
                _results.order_by(_order)[_set_min:_set_max],\
                len(_results)
        except KeyError:
            if request.session['ascending']:
                _r = book_set(request, _order, _limit, _set, False, **kwargs)
            else: _r = book_set(request, _order, _limit, _set, True, **kwargs)
            _r_len, _search = None, None

    _bookstats = len(Collections().generic_search(query))
    if (_r_len): _btotal = str(_r_len)
    else: _btotal = str(_bookstats)
    
    return render(
       request,
       "index.html",
        {
            "Books": _results,
            "Set": str(_set),
            "Version": config.VERSION,
            # "LeftNavCollections": menu("collections"),
            # "LeftNavMenu0": menu("nav_l_0"),
            "BookStats": _btotal,
            "CollectionStats": Collections.objects.all().count(),
            "CollectionObject": collections_list,
            "NowShowing": _now_showing,
            "PostedSearch": query,
            "SearchLen": _r_len,
            "Order": _order,
        })


def flip_sort(request, bookset=1, query=None, _limit=None, _order='title'):
    """
    Goto next page in bookset
    """
    try: _set = int(bookset)
    except Exception: _set = 1
    _payload = payload(request, query, _set, _limit, _order, flip_sort=True)
    return render(
        request,
        "index.html",
        _payload,
    )


def next_page(request, bookset, query=None, _limit=None, _order='title'):
    """
    Goto next page in bookset
    """
    try:
        _set = int(bookset) + 1
    except Exception:
        _set = 1
    _payload = payload(request, query, _set, _limit, _order)
    return render(
        request,
        "index.html",
        _payload,
    )


def prev_page(request, bookset, query=None, _limit=None, _order='title'):
    """
    Goto previous page in bookset
    """
    _set = int(bookset)
    if _set <= 1:
        _set = 1
    else:
        try:
            _set = int(bookset) - 1
        except Exception:
            _set = 1
    _payload = payload(request, query, _set, _limit, _order)
    return render(
        request,
        "index.html",
        _payload,
    )


def book_set(request, _order, _limit=None, _set=1, _flip=False, **kwargs):
    """
    Get books results by set #
    """
    try:
        book_key = []
        if kwargs['favorites'] is True:
            for id in Favorites.objects.all().filter(user=request.user):
                book_key.append(id.book.id)
            BookObject = Books.objects.filter(id__in=(book_key))
    except KeyError: BookObject = Books.objects.all()
    if _limit is None:
        _limit = 20  # TODO default from user choice
    _set_max = int(_set) * _limit
    _set_min = _set_max - _limit
    if _flip:
        books = BookObject.order_by(_order).reverse()[_set_min:_set_max]
    else: 
        books = BookObject.order_by(_order)[_set_min:_set_max]
    return mark_favorites(request, books)


def mark_favorites(request, bookset):
    try:
        favorites = Favorites.objects.filter(user=request.user)
        for book in bookset:
            for favorite in favorites:
                if book == favorite.book:
                    book.is_favorite = True
                    pass
        return bookset
    except Exception as e:
        for book in bookset:
            book.if_favorite = False
    return bookset


def collection(_collection, _set, _limit=None):
    """
    Get books by collection id
    """
    _books = []
    books = []
    if _limit is None:
        _limit = 20
    _set_max = int(_set) * _limit
    _set_min = _set_max - _limit
    _collections = Collections.objects.filter(collection=_collection)
    for c in _collections:
        _books.append(c.book_id_id)
    return Books.objects.filter(id__in=_books)


def download(request, pk):
    """
    Download book by primary key
    """
    _book = Books.objects.get(pk=pk)
    _fn = hr_name(_book)
    response = HttpResponse(
        open(os.path.abspath(_book.file_name), "rb"), content_type="application/zip"
    )
    response["Content-Disposition"] = "attachment; filename=%s" % _fn
    return response


def favorite(request, pk):
    """
    Add book to favorites bu primary key
    """
    try:
        _d = Favorites.objects.filter(user=request.user, book=Books.objects.get(pk=pk))
    except TypeError as e:
        return redirect('login')
    if len(_d) == 1:
        _d.delete()
        return HttpResponse(status=204)
    _f = Favorites(book=Books.objects.get(pk=pk))
    _f.user = request.user
    _f.save()
    return HttpResponse(status=204)


def share(request, pk):
    """
    Share book by primary key
    """
    _book = Books.objects.all().filter(pk=pk)[0]
    _fn = hr_name(_book)
    response = HttpResponse(
        open(os.path.abspath(_book.file_name), "rb"), content_type="application/zip"
    )
    response["Content-Disposition"] = "attachment; filename=%s" % _fn
    return response


def info(request, pk):
    """
    Share book by primary key
    """
    _book = Books.objects.all().filter(pk=pk)[0]
    _fn = hr_name(_book)
    response = HttpResponse(
        open(os.path.abspath(_book.file_name), "rb"), content_type="application/zip"
    )
    response["Content-Disposition"] = "attachment; filename=%s" % _fn
    return response


def hr_name(book):
    """
    Nicer file names
    """
    return "{0}{1}".format(slugify(book.title), os.path.splitext(book.file_name)[1])


def format_list(list_in):
    formated_list, formated_list_key, x = [], [], 0
    for i in list_in:
        if i.id not in formated_list_key:
            if x % 2 == 0:
                c = 0
            else:
                c = 1
            if x <= 10:
                x += 1
            else:
                x = 0


def menu(which, _set=1, parent=None):
    if which == "collections":
        _collections_list = Collections.objects.all()
        _collections, collection_key, x = [], [], 0
        for i in _collections_list:
            if i.collection not in collection_key:
                if x % 2 == 0: c = 0
                else: c = 1
                if x <= 10: x = x + 1
                else: x = 0
                # TODO trim #'s and symbols from front of collection name
                if len(i.collection) > 16:
                    collection_string = i.collection[0:16] + " ..."
                else:
                    collection_string = i.collection

                _collections.append(
                    {"string": collection_string, "link": i.collection, "class": c}
                )
                collection_key.append(i.collection)
        return _collections
    elif which == "nav_lvl_0":
        navigation_list = Navigation.objects.all()
        return navigation_list


def collections_list():
    collections = Collections.objects.all()
    collection_key = []
    for i in collections:
        if i.collection not in collection_key:
            collection_key.append(i.collection)
    return list(set(collection_key))


def live(request, **kwargs):
    """
    Respond to live requests. Primarily used as a response object for Ajax calls
    :param GET['hook']: collection_listing, book_details, register
    :param kwargs['pk']: Primary key of requested object
    :return: JsonResponse Object, status response code
    """
    err_txt = {"err": "There is no responder for your request"}
    try: hook = request.GET['hook']
    except MultiValueDictKeyError as e: return JsonResponse(err_txt, status=404)

    if hook == "collection_listing":
        collections = collections_list()
        return JsonResponse({"data": collections}, status=200)

    elif hook == "details":
        try: _pk = request.GET['pk']
        except KeyError as e: return False
        book = book_details(Books.objects.get(pk=_pk))
        return JsonResponse({"data": book}, status=200)

    elif hook == "register":
        html = render_to_string('signup.html', {'form': SignUpForm}, request)
        html += render_to_string('login.html', {'form': UserLoginForm}, request)
        return JsonResponse({"data": html})

    elif hook == "import_books":
        breakpoint()
        filename = "../data/{}-{}.sock".format(request.user.username, time.strftime("%H:%M:%S"))
        catalogue = ACatalogue()
        async def responder(socket):
            await catalogue.import_books(socket=socket)
            return JsonResponse({"data": filename})
        asyncio.run(responder(filename))
        

    else: return JsonResponse(err_txt, status=404)

    return JsonResponse({"data": "Response sent"}, status=200)

def book_details(book):
    return {
        'title': book.title,
        'author': book.author,
        'description': book.description,
        'tags': book.tags,
        'rights': book.rights,
        'pk': book.id
    }
def payload(request, query, _set, _limit, _order, **kwargs):
    """
    Return formatted data to template
    : notes : This is the least pythonic function I have ever written, but its
    still beautiful
    """
    try: request.session['ascending']
    except KeyError: request.session['ascending'] = True
    try:  # Are we fliping the sort?
        if kwargs['flip_sort']:
            request.session['ascending'] = not request.session['ascending']
    except KeyError: pass
    try:  # Are we resetting the session?
        if kwargs['reset']:
            request.session['cached_query'] = query
            if _set < 1: _set = 1
            if _limit is None: _limit = 20
            _set_max = int(_set) * _limit
            _set_min = _set_max - _limit
            _now_showing = "%s-%s"%(_set_min, _set_max)
            if request.session['ascending']:
                _r = book_set(request, _order, _limit, _set, False, **kwargs)
            else: _r = book_set(request, _order, _limit, _set, True, **kwargs)
            _r_len, _search = None, None
    except KeyError:
        _set = int(_set)  # Get set #
        if _set < 1: _set = 1  # If there is no set data, set = 1
        if _limit is None: _limit = 20  # If we havent set limit limit = 20
        _set_max = int(_set) * _limit  # Multiply current set by limit to get upper limits
        _set_min = _set_max - _limit  #  Subtract limiter to get bottom limit
        _now_showing = "%s-%s"%(_set_min, _set_max)  # Set the set count
        if query:  # Are we sending a query?
            if query != request.session.get('cached_query'):  # Is it differnt to the last query?
                request.session['cached_query'] = query  # Set the session data to track the query
                if request.session['ascending']:
                    _results = Books().generic_search(query)  # Get the query, or in reverse below
                else: _results = Books().generic_search(query).reverse()
                _r, _r_len = \
                    _results[_set_min:_set_max],\
                    _results.count()
            elif query == request.session.get('cached_query'):  # The queries are equal check the direction
                if request.session['ascending']:
                    _results = Books().generic_search(query)
                else: _results = Books().generic_search(query).reverse()
                _r, _r_len = \
                    _results.order_by(_order)[_set_min:_set_max],\
                    _results.count()
        else:  # No new query was passed
            try:
                query = request.session['cached_query']  # Is there a cached query?
                if query == None: raise KeyError  # No cached query exists jump to KeyError
                if request.session['ascending']:
                    _results = Books().generic_search(query)
                else: _results = Books().generic_search(query).reverse()
                _r, _r_len = \
                    _results.order_by(_order)[_set_min:_set_max],\
                    _results.count()
            except KeyError:
                if request.session['ascending']:
                    _r = book_set(request, _order, _limit, _set, False, **kwargs)
                else: _r = book_set(request, _order, _limit, _set, True, **kwargs)
                _r_len, _search = None, None
    
    _bookstats = Books.objects.all().count()
    if (_r_len): _btotal = str(_r_len)
    else: _btotal = str(_bookstats)
    # Format the payload and return it to the view
    return {
        "Books": _r,
        "Set": str(_set),
        "Version": config.VERSION,
        # "LeftNavCollections": menu("collections"),
        # "LeftNavMenu0": menu("nav_l_0"),
        "BookStats": _btotal,
        "CollectionStats": Collections.objects.all().count(),
        "CollectionObject": collections_list,
        "NowShowing": _now_showing,
        "PostedSearch": query,
        "SearchLen": _r_len,
        "Order": _order,
    }