<?php

namespace WP_CLI\Fetchers;

use WP_CLI\Utils;

/**
 * Fetch a WordPress theme based on one of its attributes.
 */
class Theme extends Base {

    /**
     * @var string $msg Error message to use when invalid data is provided
     */
    protected $msg = "The '%s' theme could not be found.";

    /**
     * Get a theme object by name
     *
     * @param string $name
     * @return object|false
     */
    public function get( $name ) {
        // Workaround to equalize folder naming conventions across Win/Mac/Linux.
        // Returns false if theme stylesheet doesn't exactly match existing themes.
        $existing_themes      = wp_get_themes( array( 'errors' => null ) );
        $existing_stylesheets = array_keys( $existing_themes );
        if ( ! in_array( $name, $existing_stylesheets, true ) ) {
            $inexact_match = $this->find_inexact_match( $name, $existing_themes );
            if ( false !== $inexact_match ) {
                $this->msg .= sprintf( " Did you mean '%s'?", $inexact_match );
            }
            return false;
        }

        $theme = $existing_themes[ $name ];

        return $theme;
    }

    /**
     * Find and return the key in $existing_themes that matches $name with
     * a case insensitive string comparison.
     *
     * @param string $name Name of theme received by command.
     * @param array  $existing_themes Key/value pair of existing themes, key is
     *                                a case sensitive name.
     * @return string|boolean Case sensitive name if match found, otherwise false.
     */
    private function find_inexact_match( $name, $existing_themes ) {
        $target = strtolower( $name );
        $themes = array_map( 'strtolower', array_keys( $existing_themes ) );

        if ( in_array( $target, $themes, true ) ) {
            return $target;
        }

        $suggestion = Utils\get_suggestion( $target, $themes );

        if ( '' !== $suggestion ) {
            return $suggestion;
        }

        return false;
    }
}