<?php

namespace App\Services\Preferences;

use App\Models\Preferences;
use Illuminate\Contracts\Pagination\LengthAwarePaginator;

class PreferencesQueryService
{
    public function __construct(private PreferencesOptionsService $options)
    {
    }

    public function getForUser(int $userId): array
    {
        $row = Preferences::query()->where('user_id', $userId)->first();

        $base = $this->options->defaultPreferences();
        if (!$row) {
            return [
                'preferences' => $base,
                'options' => $this->optionsPayload(),
            ];
        }

        return [
            'preferences' => array_merge($base, $this->mapRow($row)),
            'options' => $this->optionsPayload(),
        ];
    }

    public function paginate(array $filters, int $page = 1, int $perPage = 20): LengthAwarePaginator
    {
        $query = Preferences::query()
            ->leftJoin('users', 'users.id', '=', 'user_preferences.user_id')
            ->select('user_preferences.*', 'users.firstname', 'users.lastname', 'users.email');

        if (!empty($filters['user_id'])) {
            $query->where('user_preferences.user_id', (int) $filters['user_id']);
        }

        if (!empty($filters['q'])) {
            $term = '%' . strtolower(trim((string) $filters['q'])) . '%';
            $query->where(function ($q) use ($term) {
                $q->whereRaw('LOWER(users.firstname) LIKE ?', [$term])
                    ->orWhereRaw('LOWER(users.lastname) LIKE ?', [$term])
                    ->orWhereRaw('LOWER(users.email) LIKE ?', [$term]);
            });
        }

        $sortBy = (string) ($filters['sort_by'] ?? 'updated_at');
        $sortDir = strtolower((string) ($filters['sort_dir'] ?? 'desc')) === 'asc' ? 'asc' : 'desc';
        $allowedSorts = ['updated_at', 'created_at', 'user_id'];

        if (in_array($sortBy, $allowedSorts, true)) {
            $query->orderBy('user_preferences.' . $sortBy, $sortDir);
        } else {
            $query->orderBy('user_preferences.updated_at', 'desc');
        }

        return $query->paginate($perPage, ['*'], 'page', $page);
    }

    private function optionsPayload(): array
    {
        return [
            'style_options' => $this->options->styleOptions(),
            'menu_options' => $this->options->menuOptions(),
        ];
    }

    private function mapRow(Preferences $row): array
    {
        return [
            'receive_email_notifications' => (bool) ($row->notification_email ?? false),
            'receive_sms_notifications' => (bool) ($row->notification_sms ?? false),
            'theme' => $row->theme ?? null,
            'language' => $row->language ?? null,
            'style_color' => $row->style_color ?? null,
            'menu_color' => $row->menu_color ?? null,
        ];
    }
}