<?php

namespace App\Http\Controllers;

use App\Http\Controllers\Concerns\ManagesCachedPages;
use App\Models\Page;
use App\Models\Profile;
use App\Models\User;
use App\Services\FollowerService;
use App\Services\StatusService;
use App\Util\ActivityPub\Helpers;
use App\Util\Localization\Localization;
use Illuminate\Contracts\View\View;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Str;

class SiteController extends Controller
{
    use ManagesCachedPages;

    public function home(Request $request)
    {
        if ($request->user() !== null) {
            return $this->homeTimeline($request);
        }
        return $this->homeGuest();
    }

    public function homeGuest(): View
    {
        return view('site.index');
    }

    public function homeTimeline(Request $request): RedirectResponse|View
    {
        if ($request->has('force_old_ui')) {
            return view('timeline.home', ['layout' => 'feed']);
        }

        return redirect('/i/web');
    }

    public function changeLocale(Request $request, $locale): RedirectResponse
    {
        // todo: add other locales after pushing new l10n strings
        $locales = Localization::languages();
        if (in_array($locale, $locales)) {
            if ($request->user()) {
                $user = $request->user();
                $user->language = $locale;
                $user->save();
            }
            session()->put('locale', $locale);
        }

        return redirect(route('site.language'));
    }

    public function about()
    {
        // Scope the cache key by locale: the rendered view contains many
        // translated site.* strings, so a single shared key would let one
        // locale's render be served to visitors of other locales.
        $cacheKey = 'site.about_v2:'.app()->getLocale();

        return Cache::remember($cacheKey, now()->addMinutes(15), function () {
            $user_count = number_format(User::count());
            $post_count = number_format(StatusService::totalLocalStatuses());
            $rules = config_cache('app.rules') ? json_decode(config_cache('app.rules'), true) : null;

            return view('site.about', ['rules' => $rules, 'user_count' => $user_count, 'post_count' => $post_count])->render();
        });
    }

    public function language(): View
    {
        return view('site.language');
    }

    public function communityGuidelines(Request $request)
    {
        // Scope by locale: the rendered layout contains translated strings,
        // so a shared key would leak one locale's render to other locales.
        $cacheKey = 'site:help:community-guidelines:'.app()->getLocale();

        return Cache::remember($cacheKey, now()->addMinutes(15), function () {
            $slug = '/site/kb/community-guidelines';
            $page = Page::whereSlug($slug)->whereActive(true)->first();

            return view('site.help.community-guidelines', ['page' => $page])->render();
        });
    }

    public function privacy(Request $request)
    {
        $page = Cache::remember('site:privacy', now()->addDays(120), function () {
            return $this->cachedPage('/site/privacy');
        });

        return view('site.privacy', ['page' => $page])->render();
    }

    public function terms(Request $request)
    {
        $page = Cache::remember('site:terms', now()->addDays(120), function () {
            return $this->cachedPage('/site/terms');
        });

        return view('site.terms', ['page' => $page])->render();
    }

    public function redirectUrl(Request $request): View
    {
        abort_if(! $request->user(), 404);
        $this->validate($request, [
            'url' => 'required|url',
        ]);
        $url = request()->input('url');
        abort_if(Helpers::validateUrl($url) == false, 404);

        return view('site.redirect', ['url' => $url]);
    }

    public function followIntent(Request $request): View
    {
        $this->validate($request, [
            'user' => 'string|min:1|max:30|exists:users,username',
        ]);
        $profile = Profile::whereUsername($request->input('user'))->firstOrFail();
        $user = $request->user();
        abort_if($user && $profile->id == $user->profile_id, 404);
        $following = $user != null ? FollowerService::follows($user->profile_id, $profile->id) : false;

        return view('site.intents.follow', ['profile' => $profile, 'user' => $user, 'following' => $following]);
    }

    public function legacyProfileRedirect(Request $request, $username): RedirectResponse
    {
        $username = Str::contains($username, '@') ? '@'.$username : $username;
        if (str_contains($username, '@')) {
            $profile = Profile::whereUsername($username)
                ->firstOrFail();

            if ($profile->domain == null) {
                $url = "/$profile->username";
            } else {
                $url = "/i/web/profile/_/{$profile->id}";
            }

        } else {
            $profile = Profile::whereUsername($username)
                ->whereNull('domain')
                ->firstOrFail();
            $url = "/$profile->username";
        }

        return redirect($url);
    }

    public function legacyWebfingerRedirect(Request $request, $username, $domain): RedirectResponse
    {
        $un = '@'.$username.'@'.$domain;
        $profile = Profile::whereUsername($un)
            ->firstOrFail();

        if ($profile->domain == null) {
            $url = "/$profile->username";
        } else {
            $url = $request->user() ? "/i/web/profile/_/{$profile->id}" : $profile->url();
        }

        return redirect($url);
    }

    public function legalNotice(Request $request)
    {
        $page = Cache::remember('site:legal-notice', now()->addDays(120), function () {
            return $this->cachedPage('/site/legal-notice');
        });
        abort_if(! $page, 404);

        return view('site.legal-notice', ['page' => $page])->render();
    }

    public function curatedOnboarding(Request $request): RedirectResponse|View
    {
        if ($request->user()) {
            return redirect('/i/web');
        }

        $regOpen = (bool) config_cache('pixelfed.open_registration');
        $curOnboarding = (bool) config_cache('instance.curated_registration.enabled');
        $curOnlyClosed = (bool) config('instance.curated_registration.state.only_enabled_on_closed_reg');
        if ($regOpen) {
            if ($curOnlyClosed) {
                return redirect('/register');
            }
        } else {
            if (! $curOnboarding) {
                return redirect('/');
            }
        }

        return view('auth.curated-register.index', ['step' => 1]);
    }
}