import stripe

from django.conf import settings
from django.contrib import messages
from django.contrib.auth.decorators import login_required
from django.db.models import Max, Q
from django.http import HttpResponse, HttpResponseForbidden, JsonResponse
from django.shortcuts import redirect, render
from django.utils import timezone
from django.views.decorators.csrf import ensure_csrf_cookie

from apps.applets.models import Applet, UserApplet
from apps.applets.utils import applet_context
from apps.dashboard.forms import ExistingNoteItemForm, ItemForm
from apps.dashboard.models import Item, Note
from apps.lyric.models import PaymentMethod, Token, User, Wallet


APPLET_ORDER = ["wallet", "new-note", "my-notes", "username", "palette"]
UNLOCKED_PALETTES = frozenset([
    "palette-default",
    "palette-sepia",
    "palette-oblivion-light",
    "palette-monochrome-dark",
])
PALETTES = [
    {"name": "palette-default", "label": "Earthman", "locked": False},
    {"name": "palette-sepia", "label": "Sepia", "locked": False},
    {"name": "palette-oblivion-light", "label": "Oblivion (Light)", "locked": False},
    {"name": "palette-monochrome-dark", "label": "Monochrome (Dark)", "locked": False},
    {"name": "palette-nirvana", "label": "Nirvana", "locked": True},
    {"name": "palette-sheol", "label": "Sheol", "locked": True},
    {"name": "palette-inferno", "label": "Inferno", "locked": True},
    {"name": "palette-terrestre", "label": "Terrestre", "locked": True},
    {"name": "palette-celestia", "label": "Celestia", "locked": True},
]


def _recent_notes(user, limit=3):
    return (
        Note
            .objects
            .filter(Q(owner=user) | Q(shared_with=user))
            .annotate(last_item=Max('item__id'))
            .order_by('-last_item')
            .distinct()[:limit]
    )

def home_page(request):
    context = {
        "form": ItemForm(),
        "palettes": PALETTES,
        "page_class": "page-dashboard",
    }
    if request.user.is_authenticated:
        context["applets"] = applet_context(request.user, "dashboard")
        context["recent_notes"] = _recent_notes(request.user)
    return render(request, "apps/dashboard/home.html", context)

def new_note(request):
    form = ItemForm(data=request.POST)
    if form.is_valid():
        nunote = Note.objects.create()
        if request.user.is_authenticated:
            nunote.owner = request.user
            nunote.save()
        form.save(for_note=nunote)
        return redirect(nunote)
    else:
        context = {
            "form": form,
            "palettes": PALETTES,
            "page_class": "page-dashboard",
        }
        if request.user.is_authenticated:
            context["applets"] = applet_context(request.user, "dashboard")
            context["recent_notes"] = _recent_notes(request.user)
        return render(request, "apps/dashboard/home.html", context)

def view_note(request, note_id):
    our_note = Note.objects.get(id=note_id)

    if our_note.owner:
        if not request.user.is_authenticated:
            return redirect("/")
        if request.user != our_note.owner and request.user not in our_note.shared_with.all():
            return HttpResponseForbidden()

    form = ExistingNoteItemForm(for_note=our_note)

    if request.method == "POST":
        form = ExistingNoteItemForm(for_note=our_note, data=request.POST)
        if form.is_valid():
            form.save()
            return redirect(our_note)
    return render(request, "apps/dashboard/note.html", {"note": our_note, "form": form})

def my_notes(request, user_id):
    owner = User.objects.get(id=user_id)
    if not request.user.is_authenticated:
        return redirect("/")
    if request.user.id != owner.id:
        return HttpResponseForbidden()
    return render(request, "apps/dashboard/my_notes.html", {"owner": owner})

def share_note(request, note_id):
    our_note = Note.objects.get(id=note_id)
    try:
        recipient = User.objects.get(email=request.POST["recipient"])
        if recipient == request.user:
            return redirect(our_note)
        our_note.shared_with.add(recipient)
    except User.DoesNotExist:
        pass
    messages.success(request, "An invite has been sent if that address is registered.")
    return redirect(our_note)

@login_required(login_url="/")
def set_palette(request):
    if request.method == "POST":
        palette = request.POST.get("palette", "")
        if palette in UNLOCKED_PALETTES:
            request.user.palette = palette
            request.user.save(update_fields=["palette"])
    if "application/json" in request.headers.get("Accept", ""):
        return JsonResponse({"palette": request.user.palette})
    return redirect("home")

@login_required(login_url="/")
def set_profile(request):
    if request.method == "POST":
        username = request.POST.get("username", "")
        request.user.username = username
        request.user.save(update_fields=["username"])
    return redirect("/")

@login_required(login_url="/")
def toggle_applets(request):
    checked = request.POST.getlist("applets")
    for applet in Applet.objects.filter(context="dashboard"):
        UserApplet.objects.update_or_create(
            user=request.user,
            applet=applet,
            defaults={"visible": applet.slug in checked},
        )
    if request.headers.get("HX-Request"):
        return render(request, "apps/dashboard/_partials/_applets.html", {
            "applets": applet_context(request.user, "dashboard"),
            "palettes": PALETTES,
            "form": ItemForm(),
            "recent_notes": _recent_notes(request.user),
        })
    return redirect("home")

@login_required(login_url="/")
@ensure_csrf_cookie
def wallet(request):
    return render(request, "apps/dashboard/wallet.html", {
        "wallet": request.user.wallet,
        "pass_token": request.user.tokens.filter(token_type=Token.PASS).first(),
        "coin": request.user.tokens.filter(token_type=Token.COIN).first(),
        "free_tokens": list(request.user.tokens.filter(
            token_type=Token.FREE, expires_at__gt=timezone.now()
        ).order_by("expires_at")),
        "tithe_tokens": list(request.user.tokens.filter(token_type=Token.TITHE)),
        "free_count": request.user.tokens.filter(
            token_type=Token.FREE, expires_at__gt=timezone.now()
        ).count(),
        "tithe_count": request.user.tokens.filter(token_type=Token.TITHE).count(),
        "applets": applet_context(request.user, "wallet"),
        "page_class": "page-wallet",
    })


@login_required(login_url="/")
def kit_bag(request):
    tokens = list(request.user.tokens.all())
    free_tokens = sorted(
        [t for t in tokens if t.token_type == Token.FREE and t.expires_at and t.expires_at > timezone.now()],
        key=lambda t: t.expires_at,
    )
    tithe_tokens = [t for t in tokens if t.token_type == Token.TITHE]
    return render(request, "core/_partials/_kit_bag_panel.html", {
        "equipped_deck": request.user.equipped_deck,
        "equipped_trinket": request.user.equipped_trinket,
        "free_token": free_tokens[0] if free_tokens else None,
        "free_count": len(free_tokens),
        "tithe_token": tithe_tokens[0] if tithe_tokens else None,
        "tithe_count": len(tithe_tokens),
    })

@login_required(login_url="/")
def toggle_wallet_applets(request):
    checked = request.POST.getlist("applets")
    for applet in Applet.objects.filter(context="wallet"):
        UserApplet.objects.update_or_create(
            user=request.user,
            applet=applet,
            defaults={"visible": applet.slug in checked},
        )
    if request.headers.get("HX-Request"):
        return render(request, "apps/wallet/_partials/_applets.html", {
            "applets": applet_context(request.user, "wallet"),
            "wallet": request.user.wallet,
            "pass_token": request.user.tokens.filter(token_type=Token.PASS).first(),
            "coin": request.user.tokens.filter(token_type=Token.COIN).first(),
            "free_tokens": list(request.user.tokens.filter(token_type=Token.FREE)),
            "tithe_tokens": list(request.user.tokens.filter(token_type=Token.TITHE)),
        })
    return redirect("wallet")

@login_required(login_url="/")
def setup_intent(request):
    stripe.api_key = settings.STRIPE_SECRET_KEY
    user = request.user
    if not user.stripe_customer_id:
        customer = stripe.Customer.create(email=user.email)
        user.stripe_customer_id = customer.id
        user.save(update_fields=["stripe_customer_id"])
    intent = stripe.SetupIntent.create(customer=user.stripe_customer_id)
    return JsonResponse({
        "client_secret": intent.client_secret,
        "publishable_key": settings.STRIPE_PUBLISHABLE_KEY,
    })

@login_required(login_url="/")
def save_payment_method(request):
    stripe.api_key = settings.STRIPE_SECRET_KEY
    pm_id = request.POST.get("payment_method_id")
    pm = stripe.PaymentMethod.retrieve(pm_id)
    stripe.PaymentMethod.attach(pm_id, customer=request.user.stripe_customer_id)
    PaymentMethod.objects.create(
        user=request.user,
        stripe_pm_id=pm_id,
        last4=pm.card.last4,
        brand=pm.card.brand,
    )
    return JsonResponse({"last4": pm.card.last4, "brand": pm.card.brand})