<?php
defined('BASEPATH') or exit('No direct script access allowed');

class Hubtel_sms_model extends App_Model
{
    public function __construct()
    {
        parent::__construct();
    }

    public function get_messages($id = '')
    {
        if (is_numeric($id)) {
            $this->db->where('id', $id);
            return $this->db->get(db_prefix() . 'hubtel_sms_messages')->row();
        }

        return $this->db->get(db_prefix() . 'hubtel_sms_messages')->result_array();
    }

    public function get_template($id)
    {
        $this->db->where('id', $id);
        return $this->db->get(db_prefix() . 'hubtel_sms_templates')->row();
    }

    public function get_templates()
    {
        return $this->db->get(db_prefix() . 'hubtel_sms_templates')->result_array();
    }

    public function add_template($data)
    {
        $this->db->insert(db_prefix() . 'hubtel_sms_templates', [
            'name' => $data['name'],
            'template' => $data['template']
        ]);

        return $this->db->insert_id();
    }

    public function update_template($id, $data)
    {
        $this->db->where('id', $id);
        $this->db->update(db_prefix() . 'hubtel_sms_templates', [
            'name' => $data['name'],
            'template' => $data['template'],
            'updated_at' => date('Y-m-d H:i:s')
        ]);

        return $this->db->affected_rows() > 0;
    }

    public function delete_template($id)
    {
        $this->db->where('id', $id);
        $this->db->delete(db_prefix() . 'hubtel_sms_templates');

        return $this->db->affected_rows() > 0;
    }

    public function send_sms($to, $message, $template_id = null)
    {
        // Get Hubtel API credentials
        $client_id = get_option('hubtel_sms_client_id');
        $client_secret = get_option('hubtel_sms_client_secret');
        $sender_id = get_option('hubtel_sms_sender_id');

        if (empty($client_id) || empty($client_secret) || empty($sender_id)) {
            return [
                'success' => false,
                'message' => 'Hubtel API credentials not configured'
            ];
        }

        // If template is provided, get the message from template
        if ($template_id) {
            $template = $this->get_template($template_id);
            if ($template) {
                $message = $template->template;
            }
        }

        // Record the message in database
        $message_data = [
            'to' => $to,
            'message' => $message,
            'status' => 'pending',
            'sent_by' => get_staff_user_id()
        ];

        $this->db->insert(db_prefix() . 'hubtel_sms_messages', $message_data);
        $message_id = $this->db->insert_id();

        // Send SMS using Hubtel API
        $response = $this->hubtel_api->send_sms($to, $message, $sender_id);

        // Update message status and log the response
        $this->db->where('id', $message_id);
        $this->db->update(db_prefix() . 'hubtel_sms_messages', [
            'status' => $response['success'] ? 'sent' : 'failed'
        ]);

        // Log the response
        $this->db->insert(db_prefix() . 'hubtel_sms_logs', [
            'message_id' => $message_id,
            'response' => json_encode($response),
            'status' => $response['success'] ? 'success' : 'failed'
        ]);

        return $response;
    }

    public function get_total_messages($status = '')
    {
        if ($status !== '') {
            $this->db->where('status', $status);
        }
        return $this->db->count_all_results(db_prefix() . 'hubtel_sms_messages');
    }

    public function get_total_cost()
    {
        $this->db->select_sum('rate');
        $this->db->where('status', 'sent');
        $query = $this->db->get(db_prefix() . 'hubtel_sms_messages');
        return $query->row()->rate ?? 0;
    }
    public function get_message_logs($message_id)
    {
        $this->db->where('message_id', $message_id);
        $this->db->order_by('created_at', 'desc');
        return $this->db->get(db_prefix() . 'hubtel_sms_logs')->result_array();
    }

    private function validate_credentials()
    {
        $client_id = get_option('hubtel_sms_client_id');
        $client_secret = get_option('hubtel_sms_client_secret');
        $sender_id = get_option('hubtel_sms_sender_id');

        return !empty($client_id) && !empty($client_secret) && !empty($sender_id);
    }

    private function process_template_merge_fields($template)
    {
        // Add merge field processing here
        // Example: Replace {contact_firstname} with actual value
        $CI = &get_instance();
        
        // Load necessary models
        $CI->load->model('clients_model');
        $CI->load->model('invoices_model');

        // Process client fields
        $client_id = get_client_user_id();
        if ($client_id) {
            $client = $CI->clients_model->get($client_id);
            $template = str_replace('{contact_firstname}', $client->firstname ?? '', $template);
            $template = str_replace('{contact_lastname}', $client->lastname ?? '', $template);
            $template = str_replace('{client_company}', $client->company ?? '', $template);
            $template = str_replace('{client_phonenumber}', $client->phonenumber ?? '', $template);
        }

        return $template;
    }

    public function get_recent_messages($limit = 5)
{
    $this->db->order_by('date_sent', 'desc');
    $this->db->limit($limit);
    return $this->db->get(db_prefix() . 'hubtel_sms_messages')->result_array();
}
}