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<?php
// Load CodeIgniter
require 'index.php';
// Create a log file to track the execution
$logFile = 'email_queue_processor.log';
file_put_contents($logFile, "Cir Script started at " . date('Y-m-d H:i:s') . "\n", FILE_APPEND);

class EmailQueueProcessor
{
    private $ci;
    private $logFile;

    public function __construct($logFile)
    {
        $this->ci = &get_instance();
        $this->logFile = $logFile;

        if (is_null($this->ci)) {
            throw new Exception('Failed to initialize CodeIgniter instance.');
        }

        // Load necessary models and libraries
        $this->ci->load->library('email_worker');
    }

    private function log($message)
    {
        file_put_contents($this->logFile, $message . "\n", FILE_APPEND);
    }

    private function cir_products()
    {
        $this->ci->db->select('product_id')
            ->from('product_master')
            ->like('product_name','CIR Monthly')
            ->order_by('product_id', 'ASC');
        return $this->ci->db->get()->result();
    }

    private function cir_subscribers($arr) 
    {
        $this->ci->db->select('id, first_name, last_name, mobile, email, user_type, subscription_type, is_checked')
            ->from('subscription_register')
            ->where('user_type', 'Register')
            ->where_in('subscription_type', $arr);
        return $this->ci->db->get()->result();
    }

    private function get_product_ids()
    {
        $id_arr = [];
        $products = $this->cir_products();
        foreach ($products as $product) {
            $id_arr[] = $product->product_id;
        }
        return $id_arr;
    }

    public function subscribers($value = 1) 
    {       
        $this->ci->db->select('id,first_name,last_name,mobile,email,user_type,subscription_type,is_checked');       
        $this->ci->db->from('subscription_register');   
        $this->ci->db->where('user_type','Register');                   
        $this->ci->db->where_in('is_checked',$value);                   
        $query = $this->ci->db->get();  
        //echo $this->db->last_query(); die;
        return $query->result();        
    }

    public function process_queue()
    {
        $this->log("Processing queue at " . date('Y-m-d H:i:s'));

        $retry_limit = 3;
        $this->ci->db->where('status', 'pending');  // Status must be 'pending'
        $this->ci->db->where('report_name NOT LIKE', '%lite%'); // report_name must not contain 'lite'
        $this->ci->db->or_where('status', 'failed')->where('retry_count <', $retry_limit);
        $this->ci->db->limit(10);
        $jobs = $this->ci->db->get('email_scheduling_queue')->result();

        if (empty($jobs)) {
            $this->log("No jobs found at " . date('Y-m-d H:i:s'));
        }

        foreach ($jobs as $job) {
            try {
                $this->log("Processing job ID " . $job->id . " at " . date('Y-m-d H:i:s'));
                $this->ci->db->where('id', $job->id);
                $this->ci->db->update('email_scheduling_queue', ['status' => 'processing']);

                $cir_id_arr = $this->get_product_ids();
                $cir_subscribers = $this->cir_subscribers($cir_id_arr);
                $subscribers = $this->subscribers();

                //$cir_subscribers = json_decode($job->cir_subscribers, true);
                // $subscribers = json_decode($job->cir_subscribers, true);

                $checklitecir = json_decode($job->checklitecir);
                $report_name = $job->report_name;
                $status = $this->send_email_notifications($cir_id_arr,$cir_subscribers, $subscribers, $checklitecir, $report_name, $job->id);

                $update_data = [
                    'status' => $status['success'] ? 'completed' : 'failed',
                    'retry_count' => $status['success'] ? $job->retry_count : $job->retry_count + 1,
                    'processed_at' => date('Y-m-d H:i:s'),
                    'error_message' => $status['failed_emails'] ? implode(', ', $status['failed_emails']) : null
                ];
                $this->ci->db->where('id', $job->id);
                $this->ci->db->update('email_scheduling_queue', $update_data);

                $this->log("Completed job ID " . $job->id . " at " . date('Y-m-d H:i:s'));
            } catch (Exception $e) {
                $this->log('Failed to process job ID ' . $job->id . ' at ' . date('Y-m-d H:i:s') . ': ' . $e->getMessage());
                $this->ci->db->where('id', $job->id);
                $this->ci->db->update('email_scheduling_queue', [
                    'status' => 'failed',
                    'retry_count' => $job->retry_count + 1,
                    'processed_at' => date('Y-m-d H:i:s'),
                    'error_message' => $e->getMessage()
                ]);
            }
        }
    }

    private function log_email_delivery_status($job_id, $email, $status, $report_name, $error_message = null)
    {
        $data = [
            'job_id' => $job_id,
            'user_email' => $email,
            'status' => $status,
            'error_message' => $error_message,
            'report_name' => $report_name,
            'sent_at' => ($status === 'sent') ? date('Y-m-d H:i:s') : null
        ];

        $this->ci->db->insert('email_delivery_tracking', $data);
    }

    private function send_email_notifications($cir_id_arr,$cir_subscribers, $subscribers, $checklitecir, $report_name, $job_id) // Add $job_id
    {
        global $logFile;
        $this->log("Sending emails...");

        $emails = [];
        $status = [
            'success' => true,
            'failed_emails' => []
        ];
        $cir_id_arr = json_decode(json_encode($cir_id_arr), true);
        $subscribers = json_decode(json_encode($subscribers), true);
        $cir_subscribers = json_decode(json_encode($cir_subscribers), true);

        // Extract CIR-Lite subscribers (they take priority)
        if ($checklitecir > 0) {
            $emails = array_reduce($subscribers, function ($carry, $subscriber) use ($cir_id_arr) {
                if ($subscriber['is_checked'] && in_array($subscriber['subscription_type'], $cir_id_arr)) {
                    $carry[$subscriber['email']] = [
                        'name' => $subscriber['first_name'],
                        'id'   => $subscriber['id'],
                        'type' => 'CIR-Lite',
                    ];
                }
                return $carry;
            }, []);
        }


        // Extract CIR subscribers (if not already in CIR-Lite)
        foreach ($cir_subscribers as $subscriber) {
            if (!$subscriber['is_checked'] && !array_key_exists($subscriber['email'], $emails)) {
                $emails[$subscriber['email']] = [
                    'name' => $subscriber['first_name'],
                    'id'   => $subscriber['id'],
                    'type' => 'CIR',
                ];
            }
        }
  

        // Process each email recipient
        foreach ($emails as $email => $recipient) {
            $emailData = [
                'subject' => 'Latest Monthly CIR Upload Notification',
                'body'    => $this->get_cir_email_body(),
                'file'    => '',
            ];

            if ($recipient['type'] === 'CIR-Lite') {
                // Define the path to the uploaded report
                $upload_dir = realpath(APPPATH . '../uploads/lite_cir_report') . '/';
                $newFileName = preg_replace('/^CIR/', 'CIR-Lite', $report_name);
                $original_file_path = $upload_dir . "CIR-Lite-" . $newFileName;
                  // Ensure the upload directory and file path are valid
                if (!file_exists($upload_dir) || !file_exists($original_file_path)) {
                    log_message('error', 'Upload directory or report file does not exist: ' . $upload_dir . ', ' . $original_file_path);
                    $this->log("[" . date('Y-m-d H:i:s') . "] Error: Upload directory or report file does not exist.");
                    return $status;
                }
                $emailData['subject'] = 'Latest Monthly CIR & CIR-Lite Upload Notification';
                $emailData['body']    = $this->get_cir_and_lite_email_body();
                $secretCode           = $recipient['name'] . $recipient['id'];

                // Generate a customized PDF with user details
                $emailData['file'] = $this->add_user_details_to_pdf(
                    $original_file_path,
                    $recipient['name'],
                    $email,
                    $secretCode
                );

                if (!file_exists($emailData['file'])) {
                    log_message('error', 'Customized PDF not created: ' . $emailData['file']);
                    $status['success'] = false;
                    $status['failed_emails'][] = $email;
                    continue;
                }
            }

            // Send email
            if ($this->ci->email_worker->batch_send_emails([$email], $emailData['subject'], $emailData['body'], $emailData['file'])) {
                log_message('info', "Email sent successfully to $email");
                $this->log("Success: Email sent to $email");
                $this->log_email_delivery_status($job_id, $email, 'sent', $report_name);
            } else {
                log_message('error', "Failed to send email to $email");
                $status['success'] = false;
                $status['failed_emails'][] = $email;
                $this->log("Error: Failed to send email to $email.");
                $this->log_email_delivery_status($job_id, $email, 'failed', 'Error sending email', $report_name);
            }
        }

        $this->log("Cir Email sending process completed.");
        return $status;
    }

    private function add_user_details_to_pdf($file_path, $user_name, $user_email, $secretCode)
    {
        // Load TCPDF library
        $pdf = new Pdf();

        // Set document properties
        $pdf->SetCreator(PDF_CREATOR);
        $pdf->SetAuthor('Costmasters');
        $pdf->SetTitle('Customized CIR Report');
        $pdf->SetSubject('CIR Report with User Details');
        $pdf->SetKeywords('FPDI, TCPDF, PDF, report, user, details');

        // Import the original PDF
        try {
            $page_count = $pdf->setSourceFile($file_path);
        } catch (Exception $e) {
            throw new Exception("Failed to load PDF file: " . $e->getMessage());
        }

        // Iterate through all the pages of the original PDF
        for ($page_no = 1; $page_no <= $page_count; $page_no++) {
            // Import the current page
            $template_id = $pdf->importPage($page_no);
            $pdf->AddPage('L'); // 'L' for Landscape
            $pdf->useTemplate($template_id, 0, 0, 297, 210); // Landscape A4 dimensions

            // Set font and size for user details
            $pdf->SetFont('helvetica', '', 10);
            $pdf->SetTextColor(50, 50, 50);

            // Get the current date
            $date = date('Y-m-d');

            // Combine name, email, and date into a single string
            $user_details = "$user_name   $user_email   $date";

            // Add user details to the left side of the page (rotated vertically)
            $pdf->StartTransform();
            $pdf->Rotate(90, 0, 150); // Rotate text 90 degrees around (10, 150)
            $pdf->SetXY(0, 150); // Adjust X and Y coordinates for rotated text (left side)
            $pdf->Cell(0, -10, $user_details, 0, 0, 'L');
            $pdf->StopTransform();

            // Add notes to the body section, starting from the footer area
            $notes = 'Report is for captive use of registered organization, sharing this report externally is strictly prohibited.';

            // Get PDF dimensions
            $pdf_height = $pdf->GetPageHeight();
            $pdf_width = $pdf->GetPageWidth();
            $header_margin = 21;  // Adjust to actual header size
            $footer_margin = 21;  // Adjust to actual footer size
            $body_height = $pdf_height - $header_margin - $footer_margin;

            // Calculate the center position of the body section
            $notes_y_position = $header_margin + ($body_height / 2);
            $notes_x_position = $pdf_width - 5; // Position at the rightmost edge with a small margin

            // Rotate and place the notes text in the **rightmost position**
            $pdf->StartTransform();
            $pdf->Rotate(90, $notes_x_position, $notes_y_position); // Rotate 90 degrees
            $pdf->SetXY($notes_x_position, $notes_y_position); // Ensure correct positioning

            // Print text vertically, fully visible, and centered within the body
            $pdf->Cell(0, 0, $notes, 0, 0, 'C'); 
            $pdf->StopTransform();

              // Set font and color for the secret code
            $pdf->SetFont('helvetica', 'B', 12);
            $pdf->SetTextColor(0, 0, 0); // Black color for the secret code
            $pdf->setAlpha(0); // Ensure the secret code is visible

            // Calculate the center of the page
            $secret_code_width = $pdf->GetStringWidth("Secret Code: $secretCode");

            // Position the secret code in the center
            $x = ($pdf_width - $secret_code_width) / 2;
            $pdf->SetXY($x, $pdf_height / 2 - 10); // Adjusted Y to center vertically
            $pdf->Cell(0, 10, "Secret Code: $secretCode", 0, 0, 'C');
        }

        // Define the path for the customized PDF file
        $customized_file_path = str_replace('.pdf', '_customized.pdf', $file_path);

        // Output the new PDF file (save the customized PDF to the specified path)
        try {
            $pdf->Output($customized_file_path, 'F');
        } catch (Exception $e) {
            throw new Exception("Failed to save customized PDF: " . $e->getMessage());
        }

        return $customized_file_path; // Return the path of the customized PDF
    }

    private function get_cir_email_body()
    {
      return '<!DOCTYPE html>
        <html>
        <head>
            <meta charset="UTF-8">
            <style>
                 body {
                    font-family: "Trebuchet MS", sans-serif;
                    margin: 0;
                    padding: 0;
                    background-color: #f7f7f7;
                }
                .email-container {
                    background-color: #ffffff;
                    max-width: 600px;
                    margin: 30px auto;
                    padding: 40px;
                    border-radius: 8px;
                    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
                }
                .logo {
                    display: block;
                    margin: 0 auto 25px auto;
                    max-width: 160px;
                }
                h3 {
                    color: #2c3e50;
                    font-size: 20px;
                }
                p {
                    font-size: 15px;
                    line-height: 1.8;
                    margin: 15px 0;
                }
                a {
                    color: #007bff;
                    text-decoration: none;
                }
                a:hover {
                    text-decoration: underline;
                }
                .footer {
                    font-size: 12px;
                    color: #999999;
                    text-align: center;
                    margin-top: 40px;
                }
            </style>
        </head>
        <body>
            <div class="email-container">
                <img src="https://www.costmasters.in/uploads/site_logo/logo.png" alt="CostMasters Logo" class="logo">

                <h3>Greetings of the day!</h3>

                <p>We are pleased to inform you that the latest <strong>Cost Intelligence Report - CIR report</strong> for this month has been successfully uploaded on our portal.</p>

                <p>Please log in to <a href="https://www.costmasters.in" target="_blank">www.costmasters.in</a> to access your report.</p>

                <p>For any assistance, you may reach out to us at <a href="mailto:geetika@costmasters.in">geetika@costmasters.in</a> or contact us at <strong>+91 70090 77083</strong>.</p>

                <p>We appreciate your continued trust in our services.</p>

                <p>Warm regards,<br><strong>Team CostMasters</strong></p>

                <div class="footer">
                    © ' . date('Y') . ' CostMasters. All rights reserved.
                </div>
            </div>
        </body>
        </html>';
    }

    private function get_cir_and_lite_email_body()
    {
        return '<!DOCTYPE html>
        <html>
        <head>
            <meta charset="UTF-8">
            <style>
                body {
                    font-family: "Trebuchet MS", sans-serif;
                    margin: 0;
                    padding: 0;
                    background-color: #f7f7f7;
                }
                .email-container {
                    background-color: #ffffff;
                    max-width: 600px;
                    margin: 30px auto;
                    padding: 40px;
                    border-radius: 8px;
                    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
                }
                .logo {
                    display: block;
                    margin: 0 auto 25px auto;
                    max-width: 160px;
                }
                h3 {
                    color: #2c3e50;
                    font-size: 20px;
                }
                p {
                    font-size: 15px;
                    line-height: 1.8;
                    margin: 15px 0;
                }
                a {
                    color: #007bff;
                    text-decoration: none;
                }
                a:hover {
                    text-decoration: underline;
                }
                .footer {
                    font-size: 12px;
                    color: #999999;
                    text-align: center;
                    margin-top: 40px;
                }
            </style>
        </head>
        <body>
            <div class="email-container">
                <img src="https://www.costmasters.in/uploads/site_logo/logo.png" alt="CostMasters Logo" class="logo">

                <h3>Greetings of the day!</h3>

                <p>We are pleased to inform you that the latest <strong>Cost Intelligence Report - CIR report</strong> for this month has been successfully uploaded on our portal.</p>

                <p>Please log in to <a href="https://www.costmasters.in" target="_blank">www.costmasters.in</a> to access your report.</p>

                <p>For any assistance, you may reach out to us at <a href="mailto:geetika@costmasters.in">geetika@costmasters.in</a> or contact us at <strong>+91 70090 77083</strong>.</p>

                <p>We appreciate your continued trust in our services.</p>

                <p>Warm regards,<br><strong>Team CostMasters</strong></p>

                <div class="footer">
                    © ' . date('Y') . ' CostMasters. All rights reserved.
                </div>
            </div>
        </body>
        </html>';
        
    }
}

// Initialize log file path
$logFile = 'email_queue_processor.log';
$processor = new EmailQueueProcessor($logFile);
$processor->process_queue();
file_put_contents($logFile, "Cir Script ended at " . date('Y-m-d H:i:s') . "\n", FILE_APPEND);
?>