<?php

namespace ABT;

defined( 'ABSPATH' ) || exit;

class Options {
	public $citation_styles;

	/**
	 * Save the array of citation styles to $this->citation_styles and add a
	 *   link to the options page in the admin menu.
	 */
	public function __construct() {
		$this->citation_styles = $this->get_citation_styles();
		add_action( 'admin_menu', array( $this, 'add_options_page' ) );
	}

	/**
	 * Instantiates the options page.
	 */
	public function add_options_page() {
		add_options_page(
			__( "Academic Blogger's Toolkit Options", 'academic-bloggers-toolkit' ),
			__( "Academic Blogger's Toolkit", 'academic-bloggers-toolkit' ),
			'manage_options',
			'abt-options',
			array( $this, 'ABT_options_page' )
		);
	}

	/**
	 * Renders the options page.
	 */
	public function ABT_options_page() {
		if ( ! current_user_can( 'manage_options' )) {
			wp_die( __( 'You do not have sufficient permissions to access this page.', 'academic-bloggers-toolkit' ));
		}

		$abt_options = get_option( 'abt_options' );

		$updated_style_options = isset( $_POST['citation_style_options'] ) ? true : false;
		$updated_custom_css = isset( $_POST['custom_css_submit'] ) ? true : false;
		$updated_display_options = isset( $_POST['display_options_submit'] ) ? true : false;

		if ( $updated_style_options ) {
			$abt_options['citation_style']['style'] = $_POST['citation_style_style'];
			$abt_options['citation_style']['prefer_custom'] = (bool) $_POST['citation_style_prefer_custom'];
			$abt_options['citation_style']['custom_url'] = $this->check_custom_style_url( ( string ) $_POST['citation_style_custom_url'] );
		}
		$citation_style_style = $abt_options['citation_style']['style'];
		$citation_style_prefer_custom = $abt_options['citation_style']['prefer_custom'];
		$citation_style_custom_url = $abt_options['citation_style']['custom_url'];

		if ( $updated_custom_css ) {
			$abt_options['custom_css'] = stripslashes_deep( $_POST['custom_css'] );
		}
		$custom_css = isset( $abt_options['custom_css'] ) ? $abt_options['custom_css'] : '';

		if ( $updated_display_options ) {
			$abt_options['display_options']['bibliography'] = esc_html( $_POST['display_options_bibliography'] );
			$abt_options['display_options']['links'] = esc_html( $_POST['display_options_links'] );
			$abt_options['display_options']['bib_heading'] = esc_html( $_POST['display_options_bib_heading'] );
			$abt_options['display_options']['bib_heading_level'] = esc_html( $_POST['display_options_bib_heading_level'] );
		}
		$display_options_bibliography = isset( $abt_options['display_options']['bibliography'] ) ? $abt_options['display_options']['bibliography'] : '';
		$display_options_links = isset( $abt_options['display_options']['links'] ) ? $abt_options['display_options']['links'] : '';
		$display_options_bib_heading = isset( $abt_options['display_options']['bib_heading'] ) ? $abt_options['display_options']['bib_heading'] : '';
		$display_options_bib_heading_level = isset( $abt_options['display_options']['bib_heading_level'] ) ? $abt_options['display_options']['bib_heading_level'] : '';

		update_option( 'abt_options', $abt_options );

		include __DIR__ . '/views/options-page.php';
	}

	/**
	 * Grabs the citation styles from the vendor array and saves them to
	 * $this->citation_styles.
	 */
	private function get_citation_styles() {
		$json = json_decode( file_get_contents( ABT_ROOT_PATH . '/vendor/citation-styles.json' ), true );
		return $json;
	}

	/**
	 * Sanitizes and saves the path to the custom CSL file.
	 *
	 * This function should receive a URL and produce a PATH if everything
	 * checks out. Otherwise, it should return an empty string.
	 *
	 * If the sanitation fails, a dismissable notice is sent to the user.
	 *
	 * @param string $url unsanitized URL submitted with the form.
	 *
	 * @return string sanitized PATH to the CSL file
	 */
	private function check_custom_style_url( $url ) {
		if ( file_exists( $url ) && substr( $url, -4 ) === '.csl' || $url === '' ) {
			return $url;
		}
		$uploads = wp_upload_dir();
		$file = $uploads['basedir'] . str_replace( $uploads['baseurl'], '', $url );
		if ( file_exists( $file ) && substr( $file, -4 ) === '.csl' ) {
			return $file;
		} ?>
		<div class="notice notice-error is-dismissible">
			<p><?php _e( 'The provided URL is not a valid file in your WordPress upload directory. Please try again.', 'academic-bloggers-toolkit' ); ?></p>
		</div>
		<?php
		return '';
	}
}
new Options;