<?php
  define("KANBOARD_URL", "https://example.com/jsonrpc.php");
  define("KANBOARD_USER", "jsonrpc");
  define("KANBOARD_TOKEN", "YOUR_SECRET_TOKEN");

  define("KB_USER", 1);
  define("KB_PROJECT", 1);
  define("KB_TASK_COLUMN", 1);
  define("KB_TASK_CATEGORY", 1);
  define("KB_TASK_SWIMLANE", 1);


  function get_id() {
    global $id;
    $id++;
    return $id;
  }

  function get_tags() {
    return [
      "jsonrpc" => "2.0",
      "method" => "getTagsByProject",
      "id" => get_id(),
      "params" => [KB_PROJECT]
    ];
  }

  function remove_tag($tag_id) {
    return [
      "jsonrpc" => "2.0",
      "method" => "removeTag",
      "id" => get_id(),
      "params" => [$tag_id]
    ];
  }

  function create_tag($title, $color) {
    return [
      "jsonrpc" => "2.0",
      "method" => "createTag",
      "id" => get_id(),
      "params" => [
        "project_id" => KB_PROJECT,
        "tag" => $title,
        "color_id" => $color
      ]
    ];
  }

  function create_task($title, $tag, $color, $date_due) {
    return [
      "jsonrpc" => "2.0",
      "method" => "createTask",
      "id" => get_id(),
      "params" => [
        "title" => $title,
        "project_id" => KB_PROJECT,
        "color_id" => $color,
        "column_id" => KB_TASK_COLUMN,
        "owner_id" => KB_USER,
        "creator_id" => KB_USER,
        "date_due" => $date_due,
        "category_id" => KB_TASK_CATEGORY,
        "swimlane_id" => KB_TASK_SWIMLANE,
        "priority" => 1,
        "tags" => [$tag]
      ]
    ];
  }

  function move_task_position($task_id, $position) {
    return [
      "jsonrpc" => "2.0",
      "method" => "moveTaskPosition",
      "id" => get_id(),
      "params" => [
        "project_id" => KB_PROJECT,
        "task_id" => $task_id,
        "column_id" => KB_TASK_COLUMN,
        "position" => $position,
        "swimlane_id" => KB_TASK_SWIMLANE
      ]
    ];
  }

  function create_subtask($task_id, $title) {
    return [
      "jsonrpc" => "2.0",
      "method" => "createSubtask",
      "id" => get_id(),
      "params" => [
        "task_id" => $task_id,
        "title" => $title,
        "user_id" => KB_USER,
        "status" => 0
      ]
    ];
  }

  function send_request($payload) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, KANBOARD_URL);
    curl_setopt($curl, CURLOPT_USERPWD, KANBOARD_USER.":".KANBOARD_TOKEN);
    curl_setopt($curl, CURLOPT_POST, true);
    curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($payload));
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_FAILONERROR, true);
    $response = curl_exec($curl);
    curl_close($curl);
    return $response;
  }


  $now = new DateTime('now', new DateTimeZone('Europe/Berlin'));
  $id = time();


  // --- tags --- \\

  // define tag
  $tag_color = "blue";

  // old tag to be removed
  $old_tag_date = new DateTime('now', new DateTimeZone('Europe/Berlin'));
  date_sub($old_tag_date, DateInterval::createFromDateString('4 week'));
  $old_tag = $old_tag_date->format('Y-W');

  // new tag to be created
  $new_tag_date = new DateTime('now', new DateTimeZone('Europe/Berlin'));
  date_add($new_tag_date, DateInterval::createFromDateString('4 week'));
  $new_tag = $new_tag_date->format('Y-W');

  // get existing tags
  $tags = json_decode(send_request(get_tags()))->result;

  // remove old tag, create new tag
  $new_tag_exists = FALSE;
  foreach ($tags as $tag) {
    if ($tag->name == $old_tag) {
      send_request(remove_tag($tag->id));
    }
    if ($tag->name == $new_tag) {
      $new_tag_exists = TRUE;
    }
  }
  if ($new_tag_exists == FALSE) {
    send_request(create_tag($new_tag, $tag_color));
  }


  // --- tasks --- \\

  // define task and subtasks
  $task_title = "My Daily Task ".$now->format('d.m.Y');
  $task_tag = $now->format('Y-W');
  $task_color = "green";
  $task_datedue = $now->format('Y-m-d')." 12:30";
  $task_subtasks = array("First Subtask", "Second Subtask");

  // create task
  $response = send_request(create_task($task_title, $task_tag, $task_color, $task_datedue));
  $created_task_id = json_decode($response)->result;

  // move task to top & create subtasks
  if (is_int($created_task_id)) {
    send_request(move_task_position($created_task_id, 1));
    
    foreach ($task_subtasks as $subtask_title) {
      send_request(create_subtask($created_task_id, $subtask_title));
    }
  }

?>