/**
 * NotificationManager Component
 * Handles browser notifications for submission completion
 * Uses Supabase Realtime to listen for updates and localStorage to filter notifications
 */

import { useEffect } from 'react';
import { supabase } from '../utils/supabase';

interface NotificationManagerProps {
    // No props needed - component manages its own state
}

const NotificationManager: React.FC<NotificationManagerProps> = () => {
    useEffect(() => {
        console.log('[NotificationManager] Component mounted');

        // Request notification permission on mount
        if ('Notification' in window && Notification.permission === 'default') {
            Notification.requestPermission().then(permission => {
                console.log('[NotificationManager] Notification permission:', permission);
            });
        } else {
            console.log('[NotificationManager] Notification permission status:', Notification.permission);
        }

        console.log('[NotificationManager] Setting up Supabase subscription...');

        // Subscribe to Supabase Realtime for submission updates
        const channel = supabase
            .channel('submissions-notifications')
            .on(
                'postgres_changes',
                {
                    event: 'UPDATE',
                    schema: 'public',
                    table: 'submissions',
                },
                (payload) => {
                    console.log('[NotificationManager] Submission updated:', payload);
                    handleSubmissionUpdate(payload.new);
                }
            )
            .subscribe((status) => {
                console.log('[NotificationManager] Subscription status:', status);
            });

        console.log('[NotificationManager] Subscription created');

        // Cleanup on unmount
        return () => {
            console.log('[NotificationManager] Cleaning up subscription');
            supabase.removeChannel(channel);
        };
    }, []);

    const handleSubmissionUpdate = (submission: any) => {
        console.log('[NotificationManager] handleSubmissionUpdate called with:', submission);

        // Only process completed or failed submissions
        if (submission.status !== 'completed' && submission.status !== 'failed') {
            console.log('[NotificationManager] Ignoring submission with status:', submission.status);
            return;
        }

        // Check if this submission was initiated by current browser
        const mySubmissions = getMySubmissions();
        console.log('[NotificationManager] My submissions:', mySubmissions);
        console.log('[NotificationManager] Current submission_id:', submission.submission_id);

        if (!mySubmissions.includes(submission.submission_id)) {
            console.log('[NotificationManager] Not our submission, ignoring');
            return; // Not our submission, ignore
        }

        console.log('[NotificationManager] Showing notification...');

        // Show notification
        if ('Notification' in window && Notification.permission === 'granted') {
            // Parse results to count errors
            const results = submission.results || [];
            const errorCount = results.filter((r: any) => r.status === 'error').length;
            const totalCount = results.length;
            const hasErrors = errorCount > 0;

            // Determine title based on status
            let title: string;
            if (submission.status === 'failed' || hasErrors) {
                title = `❌ Có ${errorCount} link bị lỗi`;
            } else {
                title = '✅ Cấp quyền TMS hoàn tất';
            }

            // Build body content with username and GE info
            const input = submission.input || {};
            const usernameList = input.username_list || [];
            const geInput = input.ge_input || '';

            // Format username (show first 3, then "...")
            const usernameDisplay = usernameList.length > 3
                ? `${usernameList.slice(0, 3).join(', ')}...`
                : usernameList.join(', ');

            // Format GE input (show first 3 lines, then "...")
            const geLines = geInput.split('\n').filter((line: string) => line.trim());
            const geDisplay = geLines.length > 3
                ? `${geLines.slice(0, 3).join(', ')}...`
                : geLines.join(', ');

            const body = `${usernameDisplay}\n${geDisplay}`;

            const notification = new Notification(title, {
                body,
                icon: '/push_noti.png',
                tag: submission.submission_id, // Prevent duplicate notifications
            });

            // Focus window when notification is clicked
            notification.onclick = () => {
                window.focus();
                notification.close();
            };

            // Auto close after 10 seconds
            setTimeout(() => notification.close(), 10000);

            console.log('[NotificationManager] Notification shown');
        } else {
            console.log('[NotificationManager] Notification permission not granted:', Notification.permission);
        }

        // Remove from localStorage after notification
        removeMySubmission(submission.submission_id);
    };

    return null; // This component doesn't render anything
};

// Helper functions for localStorage management
const STORAGE_KEY = 'my_submissions';

export const addMySubmission = (submissionId: string) => {
    const existing = getMySubmissions();
    if (!existing.includes(submissionId)) {
        existing.push(submissionId);
        localStorage.setItem(STORAGE_KEY, JSON.stringify(existing));
        console.log('[NotificationManager] Added submission to localStorage:', submissionId);
    }
};

export const getMySubmissions = (): string[] => {
    try {
        const stored = localStorage.getItem(STORAGE_KEY);
        return stored ? JSON.parse(stored) : [];
    } catch {
        return [];
    }
};

export const removeMySubmission = (submissionId: string) => {
    const existing = getMySubmissions();
    const filtered = existing.filter(id => id !== submissionId);
    localStorage.setItem(STORAGE_KEY, JSON.stringify(filtered));
    console.log('[NotificationManager] Removed submission from localStorage:', submissionId);
};

export default NotificationManager;