<?php

namespace App\Domain\Administration\Services;

use App\Domain\Administration\Models\PortalSetting;
use App\Domain\Audit\Models\AuditLog;
use App\Domain\Reservations\Models\Reservation;
use App\Models\User;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\DB;

final class NotificationTemplateService
{
    /** @return array<string, array{label:string,subject:string,message:string}> */
    public function definitions(): array
    {
        return [
            'submitted' => [
                'label' => 'Nova requisição',
                'subject' => 'Nova requisição {reference}',
                'message' => '{requester} submeteu {reference} para decisão. Período: {starts_at} — {ends_at}.',
            ],
            'information_provided' => [
                'label' => 'Esclarecimentos prestados',
                'subject' => 'Resposta recebida para {reference}',
                'message' => '{requester} prestou esclarecimentos para {reference}.',
            ],
            'approved' => [
                'label' => 'Requisição aprovada',
                'subject' => 'Requisição {reference} aprovada',
                'message' => 'A sua requisição {reference} foi aprovada.',
            ],
            'rejected' => [
                'label' => 'Requisição rejeitada',
                'subject' => 'Requisição {reference} rejeitada',
                'message' => 'A sua requisição {reference} foi rejeitada.',
            ],
            'information_requested' => [
                'label' => 'Pedido de esclarecimentos',
                'subject' => 'Esclarecimentos necessários para {reference}',
                'message' => 'O aprovador pediu informações adicionais para {reference}.',
            ],
            'asset_substituted' => [
                'label' => 'Equipamento substituído',
                'subject' => 'Equipamento alterado em {reference}',
                'message' => 'Um equipamento de {reference} foi substituído por outro equivalente.',
            ],
        ];
    }

    /** @return array<string, array{subject:string,message:string}> */
    public function templates(): array
    {
        return Cache::remember('portal.notification_templates', now()->addHour(), function (): array {
            $keys = [];
            foreach (array_keys($this->definitions()) as $event) {
                $keys[] = "notification.{$event}.subject";
                $keys[] = "notification.{$event}.message";
            }
            $stored = PortalSetting::query()
                ->whereIn('key', $keys)
                ->get(['key', 'value'])
                ->mapWithKeys(fn (PortalSetting $setting): array => [$setting->key => $setting->value]);

            return collect($this->definitions())->mapWithKeys(function (array $definition, string $event) use ($stored): array {
                return [$event => [
                    'subject' => (string) ($stored["notification.{$event}.subject"] ?? $definition['subject']),
                    'message' => (string) ($stored["notification.{$event}.message"] ?? $definition['message']),
                ]];
            })->all();
        });
    }

    /** @return array{subject:string,message:string} */
    public function render(string $event, Reservation $reservation, ?string $comment = null): array
    {
        $template = $this->templates()[$event] ?? [
            'subject' => 'Atualização da requisição {reference}',
            'message' => 'O estado da requisição {reference} foi atualizado.',
        ];
        $replacements = [
            '{reference}' => $reservation->reference,
            '{requester}' => $reservation->requester->name,
            '{starts_at}' => $reservation->starts_at->format('d/m/Y H:i'),
            '{ends_at}' => $reservation->ends_at->format('d/m/Y H:i'),
            '{comment}' => $comment ?? '',
        ];

        return [
            'subject' => strtr($template['subject'], $replacements),
            'message' => strtr($template['message'], $replacements),
        ];
    }

    /** @param array<string, array{subject:string,message:string}> $templates */
    public function update(array $templates, User $actor): void
    {
        DB::transaction(function () use ($templates, $actor): void {
            $before = $this->templates();
            foreach ($templates as $event => $template) {
                foreach (['subject', 'message'] as $field) {
                    PortalSetting::query()->updateOrCreate(
                        ['key' => "notification.{$event}.{$field}"],
                        [
                            'value' => $template[$field],
                            'description' => "Modelo {$field} para {$event}",
                            'updated_by' => $actor->id,
                        ],
                    );
                }
            }
            AuditLog::create([
                'actor_id' => $actor->id,
                'event' => 'settings.notification_templates_updated',
                'before' => $before,
                'after' => $templates,
            ]);
        }, 3);

        Cache::forget('portal.notification_templates');
    }
}