<?php
/**
 * Plugin Name: Go Form Plugin
 * Description: Form plugin for Go players
 * Version: 0.02
 * Author: Nikola Petrov
 */

if (!defined('ABSPATH'))
  exit;

// ========== Database ==========
function go_form_activate()
{
  global $wpdb;
  require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
  $charset = $wpdb->get_charset_collate();
  $forms = $wpdb->prefix . 'go_form_forms';
  $entries = $wpdb->prefix . 'go_form_entries';

  dbDelta("CREATE TABLE $forms (
        id mediumint(9) NOT NULL AUTO_INCREMENT,
        name varchar(255) NOT NULL,
        created_at datetime DEFAULT CURRENT_TIMESTAMP NOT NULL,
        PRIMARY KEY (id)
    ) $charset;");

  dbDelta("CREATE TABLE $entries (
        id mediumint(9) NOT NULL AUTO_INCREMENT,
        form_id mediumint(9) DEFAULT 1,
        first_name varchar(100) NOT NULL,
        last_name varchar(100) NOT NULL,
        country varchar(100) DEFAULT NULL,
        club varchar(100) DEFAULT NULL,
        rank tinyint(2) DEFAULT 0,
        email varchar(255) DEFAULT NULL,
        egd_number varchar(50) DEFAULT NULL,
        comment text DEFAULT NULL,
        created_at datetime DEFAULT CURRENT_TIMESTAMP NOT NULL,
        PRIMARY KEY (id),
        KEY form_id (form_id)
    ) $charset;");

  // Add default form if none exist
  $existing_forms = $wpdb->get_var("SELECT COUNT(*) FROM $forms");
  if ($existing_forms == 0) {
    $wpdb->insert($forms, ['name' => 'Default Form']);
  }
}
register_activation_hook(__FILE__, 'go_form_activate');

function go_form_uninstall()
{
  global $wpdb;
  $wpdb->query("DROP TABLE IF EXISTS {$wpdb->prefix}go_form_entries");
  $wpdb->query("DROP TABLE IF EXISTS {$wpdb->prefix}go_form_forms");
}
register_uninstall_hook(__FILE__, 'go_form_uninstall');

// ========== Helpers ==========
$ranks = [
        0 => '30k', 1 => '29k', 2 => '28k', 3 => '27k', 4 => '26k',
        5 => '25k', 6 => '24k', 7 => '23k', 8 => '22k', 9 => '21k',
        10 => '20k', 11 => '19k', 12 => '18k', 13 => '17k', 14 => '16k',
        15 => '15k', 16 => '14k', 17 => '13k', 18 => '12k', 19 => '11k',
        20 => '10k', 21 => '9k', 22 => '8k', 23 => '7k', 24 => '6k',
        25 => '5k', 26 => '4k', 27 => '3k', 28 => '2k', 29 => '1k',
        30 => '1d', 31 => '2d', 32 => '3d', 33 => '4d', 34 => '5d',
        35 => '6d', 36 => '7d', 37 => '8d', 38 => '9d', 39 => '1p', 
        40 => '2p', 41 => '3p', 42 => '4p', 43 => '5p', 44 => '6p', 
        45 => '7p', 46 => '8p', 47 => '9p' 
];

function go_form_get_forms()
{
  global $wpdb;
  return $wpdb->get_results("SELECT * FROM {$wpdb->prefix}go_form_forms ORDER BY created_at DESC");
}

function go_form_get_entries($form_id)
{
  global $wpdb;
  return $wpdb->get_results($wpdb->prepare(
    "SELECT * FROM {$wpdb->prefix}go_form_entries WHERE form_id = %d ORDER BY rank DESC",
    $form_id
  ));
}

function go_form_render_entries_table($entries, $show_admin = false)
{
  global $ranks;

  include "templates/table.php";
}

// ========== Form Handling ==========
function go_form_handle_submission()
{
  if (!isset($_POST['go_form_nonce']) || !wp_verify_nonce($_POST['go_form_nonce'], 'go_form_action'))
    wp_die('Security check failed');

  global $wpdb;
  $data = [
    'form_id' => isset($_POST['form_id']) ? intval($_POST['form_id']) : 1,
    'first_name' => sanitize_text_field($_POST['first_name']),
    'last_name' => sanitize_text_field($_POST['last_name']),
    'country' => sanitize_text_field($_POST['country'] ?? ''),
    'club' => sanitize_text_field($_POST['club'] ?? ''),
    'rank' => intval($_POST['rank']),
    'email' => sanitize_email($_POST['email'] ?? ''),
    'egd_number' => sanitize_text_field($_POST['egd_number'] ?? ''),
    'comment' => sanitize_textarea_field($_POST['comment'] ?? '')
  ];

  if (empty($data['first_name']) || empty($data['last_name'])) {
    wp_redirect($_SERVER['HTTP_REFERER']);
    exit;
  }
  if ($data['rank'] < 0 || $data['rank'] > 47) {
    wp_redirect($_SERVER['HTTP_REFERER']);
    exit;
  }

  $wpdb->insert("{$wpdb->prefix}go_form_entries", $data);
  wp_redirect($_SERVER['HTTP_REFERER']);
  exit;
}
add_action('admin_post_go_form_submit', 'go_form_handle_submission');
add_action('admin_post_nopriv_go_form_submit', 'go_form_handle_submission');

// ========== Shortcode ==========
function go_form_shortcode($atts)
{
  global $ranks;
  $form_id = intval(shortcode_atts(['id' => 1], $atts)['id']);

  ob_start();
  include 'templates/form-shortcode.php';
  return ob_get_clean();
}
add_shortcode('go_form', 'go_form_shortcode');

// ========== Admin Actions ==========
function go_form_admin_action($type)
{
  if (!isset($_POST["go_form_{$type}_nonce"]) || !wp_verify_nonce($_POST["go_form_{$type}_nonce"], "go_form_{$type}_action"))
    wp_die('Security check failed');
  if (!current_user_can('manage_options'))
    wp_die('Insufficient permissions.');
}

function go_form_delete_entry()
{
  go_form_admin_action('delete');
  if (isset($_POST['entry_id'])) {
    global $wpdb;
    $wpdb->delete("{$wpdb->prefix}go_form_entries", ['id' => intval($_POST['entry_id'])]);
  }
  wp_redirect(admin_url('admin.php?page=go-form-settings&deleted=1'));
  exit;
}
add_action('admin_post_go_form_delete_entry', 'go_form_delete_entry');

function go_form_create_form()
{
  go_form_admin_action('create');
  if (isset($_POST['form_name']) && !empty($_POST['form_name'])) {
    global $wpdb;
    $wpdb->insert("{$wpdb->prefix}go_form_forms", ['name' => sanitize_text_field($_POST['form_name'])]);
  }
  wp_redirect(admin_url('admin.php?page=go-form-settings&created=1'));
  exit;
}
add_action('admin_post_go_form_create_form', 'go_form_create_form');

function go_form_delete_form()
{
  go_form_admin_action('delete_form');
  if (isset($_POST['form_id'])) {
    global $wpdb;
    $id = intval($_POST['form_id']);
    $wpdb->delete("{$wpdb->prefix}go_form_entries", ['form_id' => $id]);
    $wpdb->delete("{$wpdb->prefix}go_form_forms", ['id' => $id]);
  }
  wp_redirect(admin_url('admin.php?page=go-form-settings&deleted=1'));
  exit;
}
add_action('admin_post_go_form_delete_form', 'go_form_delete_form');

// ========== Admin Page ==========
function go_form_admin_menu()
{
  add_menu_page('Go Form Settings', 'Go Form', 'manage_options', 'go-form-settings', 'go_form_settings_page', 'dashicons-admin-generic');
}
add_action('admin_menu', 'go_form_admin_menu');

function go_form_settings_page()
{
  if (!current_user_can('manage_options'))
    wp_die('No access.');

  $forms = go_form_get_forms();

  if (isset($_GET['deleted']))
    echo '<div class="notice notice-success"><p>Deleted!</p></div>';
  if (isset($_GET['created']))
    echo '<div class="notice notice-success"><p>Form created!</p></div>';

  echo '<div class="wrap"><h1>Go Form Settings</h1>

    <h2>Create New Form</h2>
    <form method="post" action="' . admin_url('admin-post.php') . '">
        ' . wp_nonce_field('go_form_create_action', 'go_form_create_nonce', true, false) . '
        <input type="hidden" name="action" value="go_form_create_form">
        <table class="form-table">
            <tr><th><label for="form_name">Form Name:</label></th><td><input type="text" name="form_name" id="form_name" required></td></tr>
        </table>
        <p class="submit"><input type="submit" class="button button-primary" value="Create Form"></p>
    </form>

    <h2>Manage Forms & Entries</h2>';
  if (empty($forms)) {
    echo '<p>No forms yet.</p>';
    return;
  }

  foreach ($forms as $f) {
    echo '<div style="margin-bottom:20px">
            <h3>' . esc_html($f->name) . ' <span style="color:#888">(ID: ' . esc_html($f->id) . ')</span></h3>
            <p><small>Shortcode: <code>[go_form id=' . esc_html($f->id) . ']</code></small></p>

            <form method="post" action="' . admin_url('admin-post.php') . '" style="margin-bottom:15px">
                ' . wp_nonce_field('go_form_delete_form_action', 'go_form_delete_form_nonce', true, false) . '
                <input type="hidden" name="action" value="go_form_delete_form">
                <input type="hidden" name="form_id" value="' . esc_attr($f->id) . '">
                <input type="submit" value="Delete Form" class="button delete" onclick="return confirm(\'Delete this form and ALL entries?\')">
            </form>';

    go_form_render_entries_table(go_form_get_entries($f->id), true);
    echo '</div>';
  }
  echo '</div>';
}