<?php

namespace App\Services\Notification;

use Throwable;

class TelegramNotifier
{
    private ?string $botToken;
    private ?string $chatId;

    public function __construct()
    {
        $this->botToken = $_ENV['TELEGRAM_BOT_TOKEN'] ?? null;
        $this->chatId = $_ENV['TELEGRAM_CHAT_ID'] ?? null;
    }

    /**
     * Configure from database settings.
     */
    public function configure(string $botToken, string $chatId): void
    {
        $this->botToken = $botToken;
        $this->chatId = $chatId;
    }

    /**
     * Send a notification to Telegram.
     */
    public function send(string $message, string $type = 'info'): bool
    {
        if (!$this->botToken || !$this->chatId) {
            return false;
        }

        $icons = [
            'info' => "\xF0\x9F\x93\xA1",      // 📡
            'success' => "\xE2\x9C\x85",         // ✅
            'warning' => "\xE2\x9A\xA0\xEF\xB8\x8F", // ⚠️
            'error' => "\xE2\x9D\x8C",           // ❌
            'opportunity' => "\xF0\x9F\x92\xA1", // 💡
            'funding' => "\xF0\x9F\x92\xB0",     // 💰
        ];

        $icon = $icons[$type] ?? $icons['info'];
        $fullMessage = "{$icon} *ScoutIQ*\n\n{$message}";

        try {
            $url = "https://api.telegram.org/bot{$this->botToken}/sendMessage";
            $payload = json_encode([
                'chat_id' => $this->chatId,
                'text' => $fullMessage,
                'parse_mode' => 'Markdown',
                'disable_web_page_preview' => true,
            ]);

            $context = stream_context_create([
                'http' => [
                    'method' => 'POST',
                    'header' => "Content-Type: application/json\r\n",
                    'content' => $payload,
                    'timeout' => 10,
                ],
                'ssl' => ['verify_peer' => false, 'verify_peer_name' => false],
            ]);

            $response = @file_get_contents($url, false, $context);
            return $response !== false;
        } catch (Throwable $e) {
            return false;
        }
    }

    /**
     * Notify about a new opportunity.
     */
    public function notifyNewOpportunity(array $opportunity): void
    {
        $title = $opportunity['title'] ?? 'Untitled';
        $type = $opportunity['type'] ?? 'other';
        $score = $opportunity['score'] ?? 0;
        $url = $opportunity['url'] ?? '';
        $desc = mb_substr($opportunity['description'] ?? '', 0, 200);
        $orgName = $opportunity['org_name'] ?? '';

        $message = "*New Opportunity:* {$title}\n";
        $message .= "*Type:* {$type} | *Score:* {$score}/100\n";
        if ($orgName) $message .= "*Organization:* {$orgName}\n";
        if ($desc) $message .= "_{$desc}_\n";
        if ($url) $message .= "\n[Open Link]({$url})";

        $this->send($message, 'opportunity');
    }

    /**
     * Notify about collector results.
     */
    public function notifyCollectorResults(array $results): void
    {
        $message = "*Data Collection Complete*\n\n";
        $message .= "Sources: {$results['processed']}/{$results['total_sources']}\n";
        $message .= "New Opportunities: {$results['new_opportunities']}\n";
        $message .= "New Organizations: {$results['new_organizations']}\n";
        $message .= "Errors: {$results['errors']}";

        $this->send($message, 'success');
    }

    /**
     * Send test message.
     */
    public function sendTest(): bool
    {
        return $this->send("Test notification from ScoutIQ. Your Telegram integration is working correctly!", 'success');
    }
}