<?php

/**
 * Handle Discord and Slack notifications for call events
 */
class TWP_Notifications {

    /**
     * Send notification to Discord and/or Slack
     */
    public static function send_call_notification($type, $data) {
        // Check if notifications are enabled for this type
        if (!self::is_notification_enabled($type)) {
            return;
        }

        $message = self::format_message($type, $data);
        
        // Send to Discord if configured
        $discord_url = get_option('twp_discord_webhook_url');
        if (!empty($discord_url)) {
            self::send_discord_notification($discord_url, $message, $data);
        }
        
        // Send to Slack if configured
        $slack_url = get_option('twp_slack_webhook_url');
        if (!empty($slack_url)) {
            self::send_slack_notification($slack_url, $message, $data);
        }
    }

    /**
     * Check if notifications are enabled for a specific type
     */
    private static function is_notification_enabled($type) {
        switch ($type) {
            case 'incoming_call':
                return get_option('twp_notify_on_incoming_calls', 1);
            case 'queue_timeout':
                return get_option('twp_notify_on_queue_timeout', 1);
            case 'missed_call':
                return get_option('twp_notify_on_missed_calls', 1);
            default:
                return false;
        }
    }

    /**
     * Format message based on notification type
     */
    private static function format_message($type, $data) {
        $caller = isset($data['caller']) ? $data['caller'] : 'Unknown';
        $queue = isset($data['queue']) ? $data['queue'] : 'Unknown';
        $time = current_time('Y-m-d H:i:s');
        
        switch ($type) {
            case 'incoming_call':
                return "📞 **Incoming Call**\n" .
                       "**From:** {$caller}\n" .
                       "**Queue:** {$queue}\n" .
                       "**Time:** {$time}";
                       
            case 'queue_timeout':
                $duration = isset($data['duration']) ? $data['duration'] : 'Unknown';
                return "⏰ **Queue Timeout Alert**\n" .
                       "**Caller:** {$caller}\n" .
                       "**Queue:** {$queue}\n" .
                       "**Wait Time:** {$duration} seconds\n" .
                       "**Time:** {$time}";
                       
            case 'missed_call':
                return "❌ **Missed Call**\n" .
                       "**From:** {$caller}\n" .
                       "**Queue:** {$queue}\n" .
                       "**Time:** {$time}";
                       
            default:
                return "📋 **Call Event:** {$type}\n" .
                       "**Details:** " . json_encode($data);
        }
    }

    /**
     * Send notification to Discord
     */
    public static function send_discord_notification($webhook_url, $data, $message = null) {
        $payload = array(
            'content' => $message,
            'embeds' => array(
                array(
                    'title' => self::get_notification_title($data),
                    'color' => self::get_notification_color($data),
                    'fields' => self::get_discord_fields($data),
                    'timestamp' => date('c'),
                    'footer' => array(
                        'text' => 'Twilio WP Plugin'
                    )
                )
            )
        );

        self::send_webhook_request($webhook_url, $payload, 'Discord');
    }

    /**
     * Send notification to Slack
     */
    public static function send_slack_notification($webhook_url, $data, $message = null) {
        $payload = array(
            'text' => self::get_notification_title($data),
            'attachments' => array(
                array(
                    'color' => self::get_slack_color($data),
                    'fields' => self::get_slack_fields($data),
                    'footer' => 'Twilio WP Plugin',
                    'ts' => time()
                )
            )
        );

        self::send_webhook_request($webhook_url, $payload, 'Slack');
    }

    /**
     * Get notification title
     */
    private static function get_notification_title($data) {
        $type = isset($data['type']) ? $data['type'] : 'call_event';
        
        switch ($type) {
            case 'incoming_call':
                return '📞 Incoming Call';
            case 'queue_timeout':
                return '⏰ Queue Timeout Alert';
            case 'missed_call':
                return '❌ Missed Call';
            case 'urgent_voicemail':
                return '🚨 URGENT Voicemail Alert';
            default:
                return '📋 Call Event';
        }
    }

    /**
     * Get notification color for Discord (decimal)
     */
    private static function get_notification_color($data) {
        $type = isset($data['type']) ? $data['type'] : 'call_event';
        
        switch ($type) {
            case 'incoming_call':
                return 3447003; // Blue
            case 'queue_timeout':
                return 16776960; // Yellow
            case 'missed_call':
                return 15158332; // Red
            case 'urgent_voicemail':
                return 16711680; // Bright Red
            default:
                return 9807270; // Gray
        }
    }

    /**
     * Get notification color for Slack (hex)
     */
    private static function get_slack_color($data) {
        $type = isset($data['type']) ? $data['type'] : 'call_event';
        
        switch ($type) {
            case 'incoming_call':
                return '#36a64f'; // Green
            case 'queue_timeout':
                return '#ffcc00'; // Yellow
            case 'missed_call':
                return '#ff0000'; // Red
            case 'urgent_voicemail':
                return '#ff0000'; // Bright Red
            default:
                return '#666666'; // Gray
        }
    }

    /**
     * Get Discord fields
     */
    private static function get_discord_fields($data) {
        $fields = array();
        
        if (isset($data['caller'])) {
            $fields[] = array(
                'name' => 'Caller',
                'value' => $data['caller'],
                'inline' => true
            );
        }
        
        if (isset($data['queue'])) {
            $fields[] = array(
                'name' => 'Queue',
                'value' => $data['queue'],
                'inline' => true
            );
        }
        
        if (isset($data['duration'])) {
            $fields[] = array(
                'name' => 'Duration',
                'value' => $data['duration'] . ' seconds',
                'inline' => true
            );
        }
        
        if (isset($data['workflow_number'])) {
            $fields[] = array(
                'name' => 'Number Called',
                'value' => $data['workflow_number'],
                'inline' => true
            );
        }
        
        // Urgent voicemail specific fields
        if (isset($data['type']) && $data['type'] === 'urgent_voicemail') {
            if (isset($data['from_number'])) {
                $fields[] = array(
                    'name' => '📞 From',
                    'value' => $data['from_number'],
                    'inline' => true
                );
            }
            
            if (isset($data['keyword'])) {
                $fields[] = array(
                    'name' => '🔴 Keyword Detected',
                    'value' => strtoupper($data['keyword']),
                    'inline' => true
                );
            }
            
            if (isset($data['transcription'])) {
                // Truncate transcription if too long
                $transcription = $data['transcription'];
                if (strlen($transcription) > 500) {
                    $transcription = substr($transcription, 0, 497) . '...';
                }
                $fields[] = array(
                    'name' => '📝 Transcription',
                    'value' => $transcription,
                    'inline' => false
                );
            }
            
            if (isset($data['admin_url'])) {
                $fields[] = array(
                    'name' => '🔗 Action',
                    'value' => '[Listen to Voicemail](' . $data['admin_url'] . ')',
                    'inline' => false
                );
            }
        }
        
        return $fields;
    }

    /**
     * Get Slack fields
     */
    private static function get_slack_fields($data) {
        $fields = array();
        
        if (isset($data['caller'])) {
            $fields[] = array(
                'title' => 'Caller',
                'value' => $data['caller'],
                'short' => true
            );
        }
        
        if (isset($data['queue'])) {
            $fields[] = array(
                'title' => 'Queue',
                'value' => $data['queue'],
                'short' => true
            );
        }
        
        if (isset($data['duration'])) {
            $fields[] = array(
                'title' => 'Duration',
                'value' => $data['duration'] . ' seconds',
                'short' => true
            );
        }
        
        if (isset($data['workflow_number'])) {
            $fields[] = array(
                'title' => 'Number Called',
                'value' => $data['workflow_number'],
                'short' => true
            );
        }
        
        // Urgent voicemail specific fields
        if (isset($data['type']) && $data['type'] === 'urgent_voicemail') {
            if (isset($data['from_number'])) {
                $fields[] = array(
                    'title' => 'From',
                    'value' => $data['from_number'],
                    'short' => true
                );
            }
            
            if (isset($data['keyword'])) {
                $fields[] = array(
                    'title' => '🔴 Keyword Detected',
                    'value' => strtoupper($data['keyword']),
                    'short' => true
                );
            }
            
            if (isset($data['transcription'])) {
                // Truncate transcription if too long
                $transcription = $data['transcription'];
                if (strlen($transcription) > 500) {
                    $transcription = substr($transcription, 0, 497) . '...';
                }
                $fields[] = array(
                    'title' => 'Transcription',
                    'value' => $transcription,
                    'short' => false
                );
            }
            
            if (isset($data['admin_url'])) {
                $fields[] = array(
                    'title' => 'Action',
                    'value' => '<' . $data['admin_url'] . '|Listen to Voicemail>',
                    'short' => false
                );
            }
        }
        
        return $fields;
    }

    /**
     * Send webhook request
     */
    private static function send_webhook_request($webhook_url, $payload, $service) {
        // Send notification immediately without blocking
        $response = wp_remote_post($webhook_url, array(
            'headers' => array(
                'Content-Type' => 'application/json',
            ),
            'body' => json_encode($payload),
            'timeout' => 10, // Reduce timeout for faster processing
            'blocking' => false, // Non-blocking request for immediate processing
        ));

        if (is_wp_error($response)) {
            error_log("TWP {$service} Notification Error: " . $response->get_error_message());
            return false;
        }

        // For non-blocking requests, we can't check response code immediately
        error_log("TWP {$service} notification sent (non-blocking)");
        return true;
    }

    /**
     * Monitor queue timeouts
     */
    public static function check_queue_timeouts() {
        global $wpdb;
        
        $threshold = get_option('twp_queue_timeout_threshold', 300); // Default 5 minutes
        $calls_table = $wpdb->prefix . 'twp_queued_calls';
        $queues_table = $wpdb->prefix . 'twp_call_queues';
        
        // Find calls that have been waiting too long
        $timeout_calls = $wpdb->get_results($wpdb->prepare("
            SELECT qc.*, q.queue_name
            FROM {$calls_table} qc
            LEFT JOIN {$queues_table} q ON qc.queue_id = q.id
            WHERE qc.status = 'waiting' 
            AND TIMESTAMPDIFF(SECOND, qc.joined_at, NOW()) > %d
            AND qc.notified_timeout IS NULL
        ", $threshold));
        
        foreach ($timeout_calls as $call) {
            // Send timeout notification
            self::send_call_notification('queue_timeout', array(
                'type' => 'queue_timeout',
                'caller' => $call->from_number,
                'queue' => $call->queue_name,
                'duration' => time() - strtotime($call->joined_at),
                'workflow_number' => $call->to_number
            ));
            
            // Mark as notified to avoid duplicate notifications
            $wpdb->update(
                $calls_table,
                array('notified_timeout' => current_time('mysql')),
                array('id' => $call->id),
                array('%s'),
                array('%d')
            );
        }
    }
}