<?php

namespace App\Http\Controllers;

use App\Enums\EventState;
use App\Http\Controllers\Api\EventsController as Presenter;
use App\Http\Controllers\Me\ChannelsController;
use App\Http\Controllers\Me\ProfileController;
use App\Models\Event;
use App\Models\User;
use App\Scheduling\DueResolver;
use Carbon\CarbonImmutable;
use Illuminate\Contracts\View\View;
use Illuminate\Http\Request;

class InboxController extends Controller
{
    private const MONTHS = ['ЯНВ', 'ФЕВ', 'МАР', 'АПР', 'МАЙ', 'ИЮН', 'ИЮЛ', 'АВГ', 'СЕН', 'ОКТ', 'НОЯ', 'ДЕК'];

    public function __construct(private readonly DueResolver $due) {}

    public function __invoke(Request $request): View
    {
        /** @var User $user */
        $user = $request->attributes->get('user');
        $today = $user->now()->startOfDay();

        $live = $user->events()->with('source')
            ->whereIn('state', EventState::nonTerminalValues())
            ->get()
            ->map(fn (Event $e) => $this->card($e, $user, $today))
            ->sortBy('sort')->values();

        $groups = [];
        foreach (['today' => ['今日', 'СЕГОДНЯ'], 'overdue' => ['遅延', 'ПРОСРОЧЕНО'], 'preparing' => ['近日', 'ГРЯДЁТ'], 'scheduled' => ['予定', 'ЗАПЛАНИРОВАНО']] as $state => [$jp, $ru]) {
            $groups[] = ['state' => $state, 'jp' => $jp, 'ru' => $ru, 'events' => $live->where('state', $state)->values()->all()];
        }

        $archive = $user->events()->with('source')
            ->whereIn('state', [EventState::Done->value, EventState::Expired->value])
            ->orderByDesc('updated_at')->limit(100)->get()
            ->map(fn (Event $e) => [
                'title' => $e->payload['title'],
                'source' => self::sourceLabel($e->source->name),
                'due' => Presenter::present($e)['due_at'],
                'closed_as' => $e->state === EventState::Expired ? 'Истекло' : ($e->payload['done_label'] ?? 'Сделано'),
            ])->values()->all();

        $profile = ProfileController::present($user);

        return view('inbox', [
            'profile' => $profile,
            'title' => $profile['badge'] > 0 ? "({$profile['badge']}) Hado" : 'Hado',
            'groups' => $groups,
            'archive' => $archive,
            'channels' => $user->channels()->orderBy('id')->get()->map(ChannelsController::present(...))->values()->all(),
            'timezones' => \DateTimeZone::listIdentifiers(),
        ]);
    }

    /** @return array<string,mixed> */
    private function card(Event $e, User $user, CarbonImmutable $today): array
    {
        $due = $this->due->resolve($e, $user);
        $wholeDay = $due->moment->eq($due->day->addDay());
        $diff = (int) round($today->diffInDays($due->day));

        return [
            'id' => $e->id,
            'state' => $e->state->value,
            'title' => $e->payload['title'],
            'subtitle' => $e->payload['subtitle'] ?? null,
            'link' => self::safeLink($e->payload['deep_link'] ?? null),
            'done_label' => $e->payload['done_label'] ?? 'Сделано',
            'can_remind' => $e->state !== EventState::Scheduled,
            'source' => self::sourceLabel($e->source->name),
            'due' => Presenter::present($e)['due_at'],
            'due_month' => self::MONTHS[(int) $due->day->format('n') - 1],
            'due_day' => $due->day->format('d'),
            'due_time' => $wholeDay ? null : $due->moment->format('H:i'),
            'rel' => self::relative($diff),
            'sort' => $due->moment->getTimestamp(),
        ];
    }

    public static function sourceLabel(string $name): string
    {
        return $name === 'manual' ? 'вручную' : $name;
    }

    /** Пропускает только относительные пути и http(s)-ссылки; прочее (напр. javascript:) отбрасывает. */
    public static function safeLink(?string $link): ?string
    {
        return $link !== null && preg_match('#^(/|https?://)#i', $link) === 1 ? $link : null;
    }

    public static function relative(int $diff): string
    {
        $days = fn (int $n) => $n % 10 === 1 && $n % 100 !== 11 ? 'день' : ($n % 10 >= 2 && $n % 10 <= 4 && ($n % 100 < 12 || $n % 100 > 14) ? 'дня' : 'дней');

        return match (true) {
            $diff === 0 => 'сегодня',
            $diff === 1 => 'завтра',
            $diff > 1 => "через {$diff} ".$days($diff),
            $diff === -1 => 'вчера',
            default => abs($diff).' '.$days(abs($diff)).' назад',
        };
    }
}