from django.conf import settings
from django.contrib.auth.decorators import login_required
from django.shortcuts import render, get_object_or_404, redirect
from django.urls import reverse
from .models import Item
from .forms import ItemForm, SignupForm
from . import steam as steam_api
from . import hltb as hltb_api


def signup(request):
    if request.method == 'POST':
        form = SignupForm(request.POST)
        if form.is_valid():
            user = form.save(commit=False)
            user.is_active = False
            user.save()
            return render(request, 'backlogger/signup_pending.html')
    else:
        form = SignupForm()
    return render(request, 'backlogger/signup.html', {'form': form})


SORT_MAP = {
    'fav':      ['-favorite', 'name'],
    'az':       ['name'],
    'za':       ['-name'],
    'newest':   ['-created_at'],
    'oldest':   ['created_at'],
    'progress': ['-progress_percent'],
}


@login_required
def item_list(request):
    category = request.GET.get('category', '')
    sort = request.GET.get('sort', 'fav')

    items = Item.objects.filter(user=request.user)
    if category:
        items = items.filter(category=category)
    items = items.order_by(*SORT_MAP.get(sort, SORT_MAP['fav']))

    return render(request, 'backlogger/list.html', {
        'items': items,
        'category': category,
        'sort': sort,
        'categories': Item.CATEGORY_CHOICES,
    })


@login_required
def item_add(request):
    if request.method == 'POST':
        form = ItemForm(request.POST)
        if form.is_valid():
            item = form.save(commit=False)
            item.user = request.user
            item.save()
            hltb_api.apply_to_item(item)
            return redirect('backlogger:list')
    else:
        form = ItemForm()
    return render(request, 'backlogger/item_form.html', {'form': form, 'action': 'Add'})


@login_required
def item_edit(request, pk):
    item = get_object_or_404(Item, pk=pk, user=request.user)
    if request.method == 'POST':
        form = ItemForm(request.POST, instance=item)
        if form.is_valid():
            updated = form.save()
            if 'name' in form.changed_data or 'category' in form.changed_data:
                hltb_api.apply_to_item(updated)
            return redirect('backlogger:list')
    else:
        form = ItemForm(instance=item)
    return render(request, 'backlogger/item_form.html', {'form': form, 'action': 'Edit', 'item': item})


@login_required
def item_delete(request, pk):
    if request.method == 'POST':
        get_object_or_404(Item, pk=pk, user=request.user).delete()
    return redirect('backlogger:list')


@login_required
def steam_login(request):
    callback = request.build_absolute_uri(reverse('backlogger:steam_callback'))
    realm = f"{request.scheme}://{request.get_host()}"
    return redirect(steam_api.build_auth_url(callback, realm))


@login_required
def steam_callback(request):
    steam_id = steam_api.verify_and_get_steam_id(request.GET.dict())
    if not steam_id:
        return render(request, 'backlogger/steam_import.html', {'error': 'Steam verification failed. Please try again.'})

    api_key = getattr(settings, 'STEAM_API_KEY', '')
    if not api_key:
        return render(request, 'backlogger/steam_import.html', {'error': 'Steam API key is not configured on the server.'})

    try:
        games = steam_api.get_owned_games(api_key, steam_id)
    except Exception:
        return render(request, 'backlogger/steam_import.html', {'error': 'Could not fetch your Steam library. Your profile may be set to private.'})

    existing = set(
        Item.objects.filter(user=request.user, category=Item.GAMES)
        .values_list('name', flat=True)
    )

    game_list = []
    for g in games:
        name = g.get('name', '')
        hours = round(g.get('playtime_forever', 0) / 60, 1)
        game_list.append({
            'appid': g.get('appid'),
            'name': name,
            'hours': hours,
            'already_imported': name in existing,
        })

    request.session['steam_games'] = game_list
    return render(request, 'backlogger/steam_import.html', {'games': game_list})


@login_required
def steam_import(request):
    if request.method != 'POST':
        return redirect('backlogger:list')

    games_by_appid = {str(g['appid']): g for g in request.session.get('steam_games', [])}
    selected = request.POST.getlist('appids')

    imported = 0
    for appid in selected:
        game = games_by_appid.get(appid)
        if not game or game['already_imported']:
            continue
        hours = game['hours']
        progress = min(100.0, hours) if hours > 0 else 0.0
        item = Item.objects.create(
            user=request.user,
            category=Item.GAMES,
            name=game['name'],
            hours_played=hours,
            progress_percent=progress,
        )
        hltb_api.apply_to_item(item)
        imported += 1

    del request.session['steam_games']
    return redirect(f"{reverse('backlogger:list')}?category=games&imported={imported}")