<?php

declare(strict_types=1);

namespace App\Services;

use App\Models\ContentBrief;
use App\Models\Event;
use App\Models\Invoice;
use App\Models\NotificationSetting;
use App\Services\Notifications\EmailNotifier;
use App\Services\Notifications\TelegramNotifier;
use App\Services\Notifications\WahaNotifier;
use Illuminate\Support\Facades\Log;

class NotificationDispatcher
{
    /** Dispatch all due notifications for enabled channels */
    public function dispatchAll(): void
    {
        $settings = NotificationSetting::where('is_enabled', true)->get();

        foreach ($settings as $setting) {
            try {
                $this->dispatchForSetting($setting);
            } catch (\Throwable $e) {
                Log::error("Notification dispatch failed for [{$setting->name}]: " . $e->getMessage());
            }
        }
    }

    public function dispatchForSetting(NotificationSetting $setting): void
    {
        $triggers = $setting->triggers ?? [];
        $hours    = $setting->notify_before_hours;

        $messages = collect();

        if (in_array('upcoming_event', $triggers)) {
            $events = Event::with('client')
                ->where('start_time', '>=', now())
                ->where('start_time', '<=', now()->addHours($hours))
                ->whereNotIn('status', ['completed', 'cancelled'])
                ->get();

            foreach ($events as $event) {
                $messages->push(
                    "📅 *Upcoming Event*\n"
                    . "*{$event->title}*\n"
                    . "⏰ " . $event->start_time->format('d M Y, H:i') . "\n"
                    . ($event->client ? "👤 {$event->client->name}\n" : '')
                    . ($event->location ? "📍 {$event->location}" : '')
                );
            }
        }

        if (in_array('invoice_due', $triggers)) {
            $invoices = Invoice::with('client')
                ->whereBetween('due_date', [now(), now()->addHours($hours)])
                ->whereNotIn('status', ['paid', 'cancelled'])
                ->get();

            foreach ($invoices as $inv) {
                $messages->push(
                    "🧾 *Invoice Due Soon*\n"
                    . "*{$inv->invoice_number}*"
                    . ($inv->title ? " — {$inv->title}" : '') . "\n"
                    . "📅 Due: " . $inv->due_date->format('d M Y') . "\n"
                    . ($inv->client ? "👤 {$inv->client->name}\n" : '')
                    . ($inv->formatted_total ?? '')
                );
            }
        }

        if (in_array('content_due', $triggers)) {
            $content = ContentBrief::with('client')
                ->whereBetween('target_date', [now(), now()->addHours($hours)])
                ->whereNotIn('status', ['posted', 'archived'])
                ->get();

            foreach ($content as $c) {
                $messages->push(
                    "🎬 *Content Target*\n"
                    . "*{$c->title}*\n"
                    . "📅 " . $c->target_date->format('d M Y') . "\n"
                    . ucfirst($c->platform)
                    . ($c->client ? " · {$c->client->name}" : '')
                );
            }
        }

        if ($messages->isEmpty()) return;

        $notifier = $this->resolveNotifier($setting);
        $notifier->sendBatch($setting, $messages->all());
    }

    /** Send a simple test message */
    public function sendTest(NotificationSetting $setting): void
    {
        $this->resolveNotifier($setting)->sendTest($setting);
    }

    private function resolveNotifier(NotificationSetting $setting): EmailNotifier|TelegramNotifier|WahaNotifier
    {
        return match ($setting->channel) {
            'email'     => new EmailNotifier,
            'telegram'  => new TelegramNotifier,
            'whatsapp'  => new WahaNotifier,
            default     => throw new \InvalidArgumentException("Unknown channel: {$setting->channel}"),
        };
    }
}