<?php
/**
 * Input Field
 *
 * @package SimpleCalendar/Admin
 */
namespace SimpleCalendar\Abstracts;

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

/**
 * The Field.
 *
 * Object for handling an input field in plugin back end.
 *
 * @since 3.0.0
 */
abstract class Field
{
	/**
	 * Field type.
	 *
	 * @access public
	 * @var string
	 */
	public $type = '';

	/**
	 * Field name.
	 *
	 * @access public
	 * @var string
	 */
	public $name = '';

	/**
	 * Field Id.
	 *
	 * @access public
	 * @var string
	 */
	public $id = '';

	/**
	 * Field title (label).
	 *
	 * @access public
	 * @var string
	 */
	public $title = '';

	/**
	 * Field type class.
	 *
	 * @access protected
	 * @var string
	 */
	protected $type_class = '';

	/**
	 * CSS classes.
	 *
	 * @access public
	 * @var string
	 */
	public $class = '';

	/**
	 * CSS styles.
	 *
	 * @access public
	 * @var string
	 */
	public $style = '';

	/**
	 * Description.
	 *
	 * @access public
	 * @var string
	 */
	public $description = '';

	/**
	 * Tooltip text.
	 *
	 * @access public
	 * @var string
	 */
	public $tooltip = '';

	/**
	 * Attributes.
	 *
	 * @access public
	 * @var string
	 */
	public $attributes = '';

	/**
	 * Placeholder.
	 *
	 * @access public
	 * @var string
	 */
	public $placeholder = '';

	/**
	 * Options.
	 *
	 * @access public
	 * @var array
	 */
	public $options = [];

	/**
	 * Value.
	 *
	 * @access public
	 * @var array|string
	 */
	public $value = '';

	/**
	 * Default value.
	 *
	 * @access public
	 * @var array|string
	 */
	public $default = '';

	public $text = '';

	/**
	 * Validation result.
	 *
	 * @access public
	 * @var string|true
	 */
	public $validation = true;

	/**
	 * Construct the field.
	 *
	 * Escapes and sets every field property.
	 *
	 * @since 3.0.0
	 *
	 * @param array $field Field data.
	 */
	public function __construct($field)
	{
		// Field properties.
		if (isset($field['title'])) {
			$this->title = esc_attr($field['title']);
		}
		if (isset($field['description'])) {
			$this->description = wp_kses_post($field['description']);
		}
		if (isset($field['type'])) {
			$this->type = esc_attr($field['type']);
		}
		if (isset($field['name'])) {
			$this->name = esc_attr($field['name']);
		}
		if (isset($field['id'])) {
			$this->id = esc_attr($field['id']);
		}
		if (isset($field['placeholder'])) {
			$this->placeholder = esc_attr($field['placeholder']);
		}
		if (isset($field['options']) && is_array($field['options'])) {
			$this->options = array_map('esc_attr', $field['options']);
		}
		if (isset($field['text'])) {
			$this->text = $field['text'];
		}

		// Escaping.
		if (!empty($field['escaping']) && (is_string($field['escaping']) || is_array($field['escaping']))) {
			if (isset($field['default'])) {
				$this->default = $this->escape_callback($field['escaping'], $field['default']);
			}
			if (isset($field['value'])) {
				$this->value = $this->escape_callback($field['escaping'], $field['value']);
			}
		} else {
			if (isset($field['default'])) {
				$this->default = $this->escape($field['default']);
			}
			if (isset($field['value'])) {
				$this->value = $this->escape($field['value']);
			}
		}

		// Validation.
		if (!empty($field['validation'])) {
			$this->validation = $this->validate($field['validation'], $this->value);
		}

		// CSS classes and styles.
		$classes = isset($field['class']) ? $field['class'] : '';
		$this->set_class($classes);
		if (isset($field['style'])) {
			$this->set_style($field['style']);
		}

		// Custom attributes.
		if (isset($field['attributes'])) {
			$this->set_attributes($field['attributes']);
		}

		// Tooltip markup.
		if (isset($field['tooltip'])) {
			$this->tooltip =
				' <i class="simcal-icon-help simcal-help-tip" data-tip="' . esc_attr($field['tooltip']) . '"></i> ';
		}
	}

	/**
	 * Set custom HTML attributes.
	 *
	 * @since  3.0.0
	 *
	 * @param  array $attributes
	 *
	 * @return void
	 */
	public function set_attributes($attributes)
	{
		$attr = '';

		if (!empty($attributes) && is_array($attributes)) {
			foreach ($attributes as $k => $v) {
				$attr .= esc_attr($k) . '="' . esc_attr($v) . '" ';
			}
		}

		$this->attributes = $attr;
	}

	/**
	 * Set CSS styles.
	 *
	 * @since  3.0.0
	 *
	 * @param  array $css
	 *
	 * @return void
	 */
	public function set_style($css)
	{
		$styles = '';

		if (!empty($css) && is_array($css)) {
			foreach ($css as $k => $v) {
				$styles .= esc_attr($k) . ': ' . esc_attr($v) . '; ';
			}
		}

		$this->style = $styles;
	}

	/**
	 * Set classes.
	 *
	 * @since  3.0.0
	 *
	 * @param  array $class
	 *
	 * @return void
	 */
	public function set_class($class)
	{
		$classes = '';
		$type_class = '';
		$error = '';

		if (!empty($class) && is_array($class)) {
			$classes = implode(' ', array_map('esc_attr', $class));
		}
		if (!empty($this->type_class)) {
			$type_class = esc_attr($this->type_class);
		}
		if (true !== $this->validation && !empty($this->validation)) {
			$error = 'simcal-field-error ';
		}

		$this->class = trim($error . 'simcal-field ' . $type_class . ' ' . $classes);
	}

	/**
	 * Escape field value.
	 *
	 * Default escape function, a wrapper for esc_attr().
	 *
	 * @since  3.0.0
	 * @access protected
	 *
	 * @param  array|string|int $value
	 *
	 * @return array|string
	 */
	protected function escape($value)
	{
		return !empty($value) ? (is_array($value) ? array_map('esc_attr', $value) : esc_attr($value)) : '';
	}

	/**
	 * Escape callback.
	 *
	 * Custom escaping function set in field args.
	 *
	 * @since  3.0.0
	 * @access protected
	 *
	 * @param  array|string $callback
	 * @param  mixed        $value
	 *
	 * @return mixed
	 */
	protected function escape_callback($callback, $value)
	{
		if ($callback && (is_string($callback) || is_array($callback))) {
			return call_user_func($callback, $value);
		}
		return esc_attr($value);
	}

	/**
	 * Validation callback.
	 *
	 * Custom field validation callback set in field args.
	 *
	 * @since  3.0.0
	 * @access protected
	 *
	 * @param  array|string $callback
	 * @param  string       $value
	 *
	 * @return true|string Expected to return bool (true) if passes, message string if not.
	 */
	protected function validate($callback, $value)
	{
		if ($callback && (is_string($callback) || is_array($callback))) {
			$screen = function_exists('get_current_screen') ? get_current_screen() : '';
			return call_user_func($callback, $value, $screen);
		}
		return true;
	}

	/**
	 * Outputs the field markup.
	 *
	 * @since  3.0.0
	 *
	 * @return void
	 */
	abstract public function html();
}