<?php

namespace App\Http\Controllers\Gallery;

use App\Album;
use App\Facade\Theme;
use App\Facade\UserConfig;
use App\Helpers\DbHelper;
use App\Http\Controllers\Controller;
use App\Http\Requests\SaveUserSettingsRequest;
use App\Mail\UserChangeEmailRequired;
use App\User;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Mail;
use Symfony\Component\HttpFoundation\Request;

class UserController extends Controller
{
    public function confirmEmailChangeState(Request $request)
    {
        $user = $this->getUser();
        if (!$user->is_email_change_in_progress)
        {
            return redirect(route('userSettings'));
        }

        // Update the e-mail address
        $user->email = $user->new_email_address;

        // Reset the e-mail change state
        $user->is_email_change_in_progress = false;
        $user->new_email_address = null;
        $user->save();

        $request->session()->flash('success', trans('auth.change_email_success_message'));
        return redirect(route('userSettings'));
    }

    public function resetEmailChangeState(Request $request)
    {
        $user = $this->getUser();
        if (!$user->is_email_change_in_progress)
        {
            return redirect(route('userSettings'));
        }

        $data = $request->all();

        if (isset($data['resend_email']))
        {
            $this->sendEmailChangeConfirmationEmail($user, $user->new_email_address);
            $request->session()->flash('info', trans('auth.change_email_required_message'));
        }

        if (isset($data['cancel_change']))
        {
            $user->is_email_change_in_progress = false;
            $user->new_email_address = null;
            $user->save();
        }

        return redirect(route('userSettings'));
    }

    public function saveSettings(SaveUserSettingsRequest $request)
    {
        $data = $request->only(['name', 'email', 'profile_alias', 'enable_profile_page']);
        $user = $this->getUser();

        if (
            UserConfig::get('require_email_verification') &&
            isset($data['email']) &&
            $data['email'] != $user->email &&
            !$user->is_email_change_in_progress
        )
        {
            // Can't update the e-mail directly until the new e-mail address has been verified.
            // TODO - send e-mail and handle response, flag e-mail as being "change in-progress"
            // Send activation e-mail

            $this->sendEmailChangeConfirmationEmail($user, $data['email']);
            $request->session()->flash('info', trans('auth.change_email_required_message'));

            // Flag the user as a change e-mail in progress
            $user->new_email_address = $data['email'];
            $user->is_email_change_in_progress = true;
            $user->save();

            unset($data['email']);
            $request->session()->flash('info', trans('auth.change_email_required_message'));
        }

        // Don't allow e-mail address to be changed if a change is in progress
        if ($user->is_email_change_in_progress)
        {
            unset($data['email']);
        }

        $user->fill($data);
        $user->enable_profile_page = (isset($data['enable_profile_page']) && strtolower($data['enable_profile_page']) == 'on');
        $user->save();

        $request->session()->flash('success', trans('gallery.user_settings.settings_saved'));

        return redirect(route('userSettings'));
    }

    public function settings(Request $request)
    {
        return Theme::render('gallery.user_settings', [
            'info' => $request->session()->get('info'),
            'success' => $request->session()->get('success'),
            'user' => $this->getUser()
        ]);
    }

    public function show(Request $request, $idOrAlias)
    {
        // If a user has a profile alias set, their profile page cannot be accessed by the ID
        $user = User::where(DB::raw('COALESCE(profile_alias, id)'), strtolower($idOrAlias))->first();

        if (is_null($user))
        {
            App::abort(404);
            return null;
        }

        $this->authorizeForUser($this->getUser(), 'view', $user);

        $albums = $this->getAlbumsForUser($user);
        $albumIDs = $this->getAlbumIDsForUser($user);
        $cameras = $this->getCamerasUsedInAlbums($albumIDs);
        $activity = $this->getActivityDatesInAlbums($albumIDs);

        $daysInMonth = $this->getDaysInMonths();

        return Theme::render('gallery.user_profile', [
            'activity_taken' => $this->constructActivityGrid($activity['taken']),
            'activity_uploaded' => $this->constructActivityGrid($activity['uploaded']),
            'albums' => $albums,
            'cameras' => $cameras,
            'month_days' => $daysInMonth,
            'user' => $user
        ]);
    }

    private function constructActivityGrid(Collection $collection)
    {
        $results = [];

        $lastYearFrom = new \DateTime();
        $lastYearFrom->sub(new \DateInterval('P1Y'));
        $lastYearFrom->add(new \DateInterval('P1D'));

        $today = new \DateTime();
        $current = clone $lastYearFrom;

        while ($current < $today)
        {
            $year = intval($current->format('Y'));
            $month = intval($current->format('m'));
            $date = intval($current->format('d'));

            if (!isset($results[$year]))
            {
                $results[$year] = [];
            }

            if (!isset($results[$year][$month]))
            {
                $results[$year][$month] = [];
            }

            if (!isset($results[$year][$month][$date]))
            {
                $results[$year][$month][$date] = 0;
            }

            $current->add(new \DateInterval('P1D'));
        }

        // Now update the totals from the collection
        foreach ($collection as $photoInfo)
        {
            $date = \DateTime::createFromFormat('Y-m-d', $photoInfo->the_date);

            $year = intval($date->format('Y'));
            $month = intval($date->format('m'));
            $date = intval($date->format('d'));

            $results[$year][$month][$date] = $photoInfo->photos_count;
        }

        // Replace the month names
        foreach ($results as $year => &$months)
        {
            foreach ($months as $month => $dates)
            {
                $monthDate = \DateTime::createFromFormat('m', $month);
                $months[$monthDate->format('M')] = $dates;
                unset($months[$month]);
            }
        }

        return $results;
    }

    private function getActivityDatesInAlbums(array $albumIDs)
    {
        $createdAt = DB::table('photos')
            ->whereIn('album_id', $albumIDs)
            ->whereRaw(DB::raw('DATE(created_at) > DATE(DATE_SUB(NOW(), INTERVAL 1 year))'))
            ->select([
                DB::raw('DATE(created_at) AS the_date'),
                DB::raw('COUNT(photos.id) AS photos_count')
            ])
            ->groupBy(DB::raw('DATE(created_at)'))
            ->orderBy(DB::raw('DATE(created_at)'))
            ->get();

        $takenAt = DB::table('photos')
            ->whereIn('album_id', $albumIDs)
            ->whereRaw(DB::raw('DATE(taken_at) > DATE(DATE_SUB(NOW(), INTERVAL 1 year))'))
            ->select([
                DB::raw('DATE(taken_at) AS the_date'),
                DB::raw('COUNT(photos.id) AS photos_count')
            ])
            ->groupBy(DB::raw('DATE(taken_at)'))
            ->orderBy(DB::raw('DATE(taken_at)'))
            ->get();

        return ['uploaded' => $createdAt, 'taken' => $takenAt];
    }

    private function getAlbumsForUser(User $user)
    {
        return DbHelper::getAlbumsForCurrentUser_NonPaged()
            ->where('user_id', $user->id)
            ->paginate(UserConfig::get('items_per_page'));
    }

    private function getAlbumIDsForUser(User $user)
    {
        $results = [];

        $albums = DbHelper::getAlbumsForCurrentUser_NonPaged()
            ->where('user_id', $user->id)
            ->select('albums.id')
            ->get();

        foreach ($albums as $album)
        {
            $results[] = intval($album->id);
        }

        return $results;
    }

    private function getCamerasUsedInAlbums(array $albumIDs)
    {
        return DB::table('photos')
            ->whereIn('album_id', $albumIDs)
            ->where([
                ['camera_make', '!=', ''],
                ['camera_model', '!=', '']
            ])
            ->groupBy('camera_make', 'camera_model', 'camera_software')
            ->select('camera_make', 'camera_model', 'camera_software', DB::raw('count(*) as photo_count'))
            ->orderBy('photo_count', 'desc')
            ->orderBy('camera_make')
            ->orderBy('camera_model')
            ->orderBy('camera_software')
            ->get();
    }

    private function getDaysInMonths()
    {
        $results = [];

        $lastYearFrom = new \DateTime();
        $lastYearFrom->sub(new \DateInterval('P1Y'));
        $lastYearFrom->sub(new \DateInterval(sprintf('P%dD', $lastYearFrom->format('d') - 1)));

        $today = new \DateTime();
        $current = clone $lastYearFrom;

        while ($current < $today)
        {
            $year = intval($current->format('Y'));
            $month = intval($current->format('m'));

            $daysInMonth = cal_days_in_month(CAL_GREGORIAN, $month, $year);
            $results[$year][$current->format('M')] = $daysInMonth;

            $current->add(new \DateInterval('P1M'));
        }

        return $results;
    }

    private function sendEmailChangeConfirmationEmail(User $user, $newEmailAddress)
    {
        $oldEmailAddress = $user->email;
        $user->email = $newEmailAddress;

        Mail::to($user)->send(new UserChangeEmailRequired($user));
        $user->email = $oldEmailAddress;
    }
}