<?php

namespace Timber;

use Exception;
use InvalidArgumentException;
use stdClass;
use Timber\Factory\PostFactory;
use WP_List_Util;
use WP_Post;
use WP_Term;
use WP_User;

/**
 * Class Helper
 *
 * As the name suggests these are helpers for Timber (and you!) when developing. You can find additional
 * (mainly internally-focused helpers) in Timber\URLHelper.
 * @api
 */
class Helper
{
    /**
     * A utility for a one-stop shop for transients.
     *
     * @api
     * @example
     * ```php
     * $context = Timber::context( [
     *     'favorites' => Timber\Helper::transient( 'user-' . $uid . '-favorites' , function() use ( $uid ) {
     *          // Some expensive query here that’s doing something you want to store to a transient.
     *          return $favorites;
     *     }, 600 ),
     * ] );
     *
     * Timber::render('single.twig', $context);
     * ```
     *
     * @param string      $slug           Unique identifier for transient
     * @param callable     $callback      Callback that generates the data that's to be cached
     * @param integer      $transient_time (optional) Expiration of transients in seconds
     * @param integer     $lock_timeout   (optional) How long (in seconds) to lock the transient to prevent race conditions
     * @param boolean     $force          (optional) Force callback to be executed when transient is locked
     *
     * @return mixed
     */
    public static function transient($slug, $callback, $transient_time = 0, $lock_timeout = 5, $force = false)
    {
        /**
         * Filters the transient slug.
         *
         * This might be useful if you are using a multilingual solution.
         *
         * @since 0.22.6
         *
         * @param string $slug The slug for the transient.
         */
        $slug = \apply_filters('timber/transient/slug', $slug);

        $enable_transients = ($transient_time === false || (\defined('WP_DISABLE_TRANSIENTS') && WP_DISABLE_TRANSIENTS)) ? false : true;
        $data = $enable_transients ? \get_transient($slug) : false;

        if (false === $data) {
            $data = self::handle_transient_locking($slug, $callback, $transient_time, $lock_timeout, $force, $enable_transients);
        }
        return $data;
    }

    /**
     * Does the dirty work of locking the transient, running the callback and unlocking.
     *
     * @internal
     *
     * @param string      $slug              Unique identifier for transient
     * @param callable    $callback          Callback that generates the data that's to be cached
     * @param integer     $transient_time    Expiration of transients in seconds
     * @param integer     $lock_timeout      How long (in seconds) to lock the transient to prevent race conditions
     * @param boolean     $force             Force callback to be executed when transient is locked
     * @param boolean     $enable_transients Force callback to be executed when transient is locked
     */
    protected static function handle_transient_locking($slug, $callback, $transient_time, $lock_timeout, $force, $enable_transients)
    {
        if ($enable_transients && self::_is_transient_locked($slug)) {
            /**
             * Filters whether to force a locked transients to be regenerated.
             *
             * If a transient is locked, it means that another process is currently generating the data.
             * If you want to force the transient to be regenerated, during that process, you can set this
             * filter to true.
             *
             * @since 2.0.0
             * @param bool $force Whether to force a locked transient to be regenerated.
             */
            $force = \apply_filters('timber/transient/force_transients', $force);

            /**
             * Filters whether to force a locked transients to be regenerated.
             *
             * If a transient is locked, it means that another process is currently generating the data.
             * If you want to force the transient to be regenerated, during that process, you can set this
             * filter to true.
             *
             * @deprecated 2.0.0, use `timber/transient/force_transients`
             */
            $force = \apply_filters_deprecated(
                'timber_force_transients',
                [$force],
                '2.0.0',
                'timber/transient/force_transients'
            );

            /**
             * Filters whether to force a specific locked transients to be regenerated.
             *
             * If a transient is locked, it means that another process is currently generating the data.
             * If you want to force the transient to be regenerated during that process, you can set this value to true.
             *
             * @example
             * ```php
             *
             * add_filter( 'timber/transient/force_transient_mycustumslug', function($force) {
             *     if(false == something_special_has_occured()){
             *       return false;
             *     }
             *
             *     return true;
             * }, 10 );
             * ```
             * @since 2.0.0
             *
             * @param bool $force Whether to force a locked transient to be regenerated.
             */
            $force = \apply_filters("timber/transient/force_transient_{$slug}", $force);

            /**
             * Filters whether to force a specific locked transients to be regenerated.
             *
             * If a transient is locked, it means that another process is currently generating the data.
             * If you want to force the transient to be regenerated, during that process, you can set this value to true.
             * `$slug` The transient slug.
             *
             * @param bool $force Whether to force a locked transient to be regenerated.
             * @deprecated 2.0.0, use `timber/transient/force_transient_{$slug}`
             */
            $force = \apply_filters_deprecated(
                "timber_force_transient_{$slug}",
                [$force],
                '2.0.0',
                "timber/transient/force_transient_{$slug}"
            );

            if (!$force) {
                //the server is currently executing the process.
                //We're just gonna dump these users. Sorry!
                return false;
            }
            $enable_transients = false;
        }
        // lock timeout shouldn't be higher than 5 seconds, unless
        // remote calls with high timeouts are made here
        if ($enable_transients) {
            self::_lock_transient($slug, $lock_timeout);
        }
        $data = $callback();
        if ($enable_transients) {
            \set_transient($slug, $data, $transient_time);
            self::_unlock_transient($slug);
        }
        return $data;
    }

    /**
     * @internal
     * @param string $slug
     * @param integer $lock_timeout
     */
    public static function _lock_transient($slug, $lock_timeout)
    {
        \set_transient($slug . '_lock', true, $lock_timeout);
    }

    /**
     * @internal
     * @param string $slug
     */
    public static function _unlock_transient($slug)
    {
        \delete_transient($slug . '_lock');
    }

    /**
     * @internal
     * @param string $slug
     */
    public static function _is_transient_locked($slug)
    {
        return (bool) \get_transient($slug . '_lock');
    }

    /* These are for measuring page render time */

    /**
     * For measuring time, this will start a timer.
     *
     * @api
     * @return float
     */
    public static function start_timer()
    {
        $time = \microtime();
        $time = \explode(' ', $time);
        $time = (float) $time[1] + (float) $time[0];
        return $time;
    }

    /**
     * For stopping time and getting the data.
     *
     * @api
     * @example
     * ```php
     * $start = Timber\Helper::start_timer();
     * // do some stuff that takes awhile
     * echo Timber\Helper::stop_timer( $start );
     * ```
     *
     * @param int     $start
     * @return string
     */
    public static function stop_timer($start)
    {
        $time = \microtime();
        $time = \explode(' ', $time);
        $time = (float) $time[1] + (float) $time[0];
        $finish = $time;
        $total_time = \round(($finish - $start), 4);
        return $total_time . ' seconds.';
    }

    /* Function Utilities
    ======================== */

    /**
     * Calls a function with an output buffer. This is useful if you have a function that outputs
     * text that you want to capture and use within a twig template.
     *
     * @api
     * @example
     * ```php
     * function the_form() {
     *     echo '<form action="form.php"><input type="text" /><input type="submit /></form>';
     * }
     *
     * $context = Timber::context( [
     *     'form' => Timber\Helper::ob_function( 'the_form' ),
     * ] );
     *
     * Timber::render('single-form.twig', $context);
     * ```
     * ```twig
     * <h1>{{ post.title }}</h1>
     * {{ my_form }}
     * ```
     * ```html
     * <h1>Apply to my contest!</h1>
     * <form action="form.php"><input type="text" /><input type="submit /></form>
     * ```
     *
     * @param callable $function
     * @param array    $args
     *
     * @return string
     */
    public static function ob_function($function, $args = [null])
    {
        \ob_start();
        \call_user_func_array($function, $args);
        return \ob_get_clean();
    }

    /**
     * Output a value (string, array, object, etc.) to the error log
     *
     * @api
     * @param mixed $error The error that you want to error_log().
     * @return void
     */
    public static function error_log($error)
    {
        global $timber_disable_error_log;
        if (!WP_DEBUG || $timber_disable_error_log) {
            return;
        }
        if (\is_object($error) || \is_array($error)) {
            $error = \print_r($error, true);
        }
        return \error_log('[ Timber ] ' . $error);
    }

    /**
     * Trigger a warning.
     *
     * @api
     *
     * @param string $message The warning that you want to output.
     *
     * @return void
     */
    public static function warn($message)
    {
        if (!WP_DEBUG) {
            return;
        }

        \trigger_error($message, E_USER_WARNING);
    }

    /**
     * Marks something as being incorrectly called.
     *
     * There is a hook 'doing_it_wrong_run' that will be called that can be used
     * to get the backtrace up to what file and function called the deprecated
     * function.
     *
     * The current behavior is to trigger a user error if `WP_DEBUG` is true.
     *
     * If you want to catch errors like these in tests, then add the @expectedIncorrectUsage tag.
     * E.g.: "@expectedIncorrectUsage Timber::get_posts()".
     *
     * @api
     * @since 2.0.0
     * @since WordPress 3.1.0
     * @see \_doing_it_wrong()
     *
     * @param string $function The function that was called.
     * @param string $message  A message explaining what has been done incorrectly.
     * @param string $version  The version of Timber where the message was added.
     */
    public static function doing_it_wrong($function, $message, $version)
    {
        /**
         * Fires when the given function is being used incorrectly.
         *
         * @param string $function The function that was called.
         * @param string $message  A message explaining what has been done incorrectly.
         * @param string $version  The version of WordPress where the message was added.
         */
        \do_action('doing_it_wrong_run', $function, $message, $version);

        if (!WP_DEBUG) {
            return;
        }

        /**
         * Filters whether to trigger an error for _doing_it_wrong() calls.
         *
         * This filter is mainly used by unit tests.
         *
         * @since WordPress 3.1.0
         * @since WordPress 5.1.0 Added the $function, $message and $version parameters.
         *
         * @param bool   $trigger  Whether to trigger the error for _doing_it_wrong() calls. Default true.
         * @param string $function The function that was called.
         * @param string $message  A message explaining what has been done incorrectly.
         * @param string $version  The version of WordPress where the message was added.
         */
        $should_trigger_error = \apply_filters(
            'doing_it_wrong_trigger_error',
            true,
            $function,
            $message,
            $version
        );

        if ($should_trigger_error) {
            if (\is_null($version)) {
                $version = '';
            } else {
                $version = \sprintf(
                    '(This message was added in Timber version %s.)',
                    $version
                );
            }

            $message .= \sprintf(
                ' Please see Debugging in WordPress (%1$s) as well as Debugging in Timber (%2$s) for more information.',
                'https://wordpress.org/support/article/debugging-in-wordpress/',
                'https://timber.github.io/docs/v2/guides/debugging/'
            );

            $error_message = \sprintf(
                '%1$s was called <strong>incorrectly</strong>. %2$s %3$s',
                $function,
                $message,
                $version
            );

            // phpcs:disable WordPress.PHP.DevelopmentFunctions.error_log_trigger_error
            // phpcs:disable WordPress.Security.EscapeOutput.OutputNotEscaped
            \trigger_error('[ Timber ] ' . $error_message);
        }
    }

    /**
     * Triggers a deprecation warning.
     *
     * If you want to catch errors like these in tests, then add the @expectedDeprecated tag to the
     * DocBlock. E.g.: "@expectedDeprecated {{ TimberImage() }}".
     *
     * @api
     * @see \_deprecated_function()
     *
     * @param string $function    The name of the deprecated function/method.
     * @param string $replacement The name of the function/method to use instead.
     * @param string $version     The version of Timber when the function was deprecated.
     *
     * @return void
     */
    public static function deprecated($function, $replacement, $version)
    {
        /**
         * Fires when a deprecated function is being used.
         *
         * @param string $function    The function that was called.
         * @param string $replacement The name of the function/method to use instead.
         * @param string $version     The version of Timber where the message was added.
         */
        \do_action('deprecated_function_run', $function, $replacement, $version);

        if (!WP_DEBUG) {
            return;
        }

        /**
         * Filters whether to trigger an error for deprecated functions.
         *
         * @since WordPress 2.5.0
         *
         * @param bool $trigger Whether to trigger the error for deprecated functions. Default true.
         */
        if (!\apply_filters('deprecated_function_trigger_error', true)) {
            return;
        }

        if (!\is_null($replacement)) {
            $error_message = \sprintf(
                '%1$s is deprecated since Timber version %2$s! Use %3$s instead.',
                $function,
                $version,
                $replacement
            );
        } else {
            $error_message = \sprintf(
                '%1$s is deprecated since Timber version %2$s with no alternative available.',
                $function,
                $version
            );
        }

        // phpcs:disable WordPress.PHP.DevelopmentFunctions.error_log_trigger_error
        // phpcs:disable WordPress.Security.EscapeOutput.OutputNotEscaped
        \trigger_error('[ Timber ] ' . $error_message);
    }

    /**
     * @api
     *
     * @param string  $separator
     * @param string  $seplocation
     * @return string
     */
    public static function get_wp_title($separator = ' ', $seplocation = 'left')
    {
        /**
         * Filters the separator used for the page title.
         *
         * @since 2.0.0
         *
         * @param string $separator The separator to use. Default `' '`.
         */
        $separator = \apply_filters('timber/helper/wp_title_separator', $separator);

        /**
         * Filters the separator used for the page title.
         *
         * @deprecated 2.0.0, use `timber/helper/wp_title_separator`
         */
        $separator = \apply_filters_deprecated('timber_wp_title_seperator', [$separator], '2.0.0', 'timber/helper/wp_title_separator');

        return \trim(\wp_title($separator, false, $seplocation));
    }

    /**
     * Sorts object arrays by properties.
     *
     * @api
     *
     * @param array  $array The array of objects to sort.
     * @param string $prop  The property to sort by.
     *
     * @return void
     */
    public static function osort(&$array, $prop)
    {
        \usort($array, function ($a, $b) use ($prop) {
            return $a->$prop > $b->$prop ? 1 : -1;
        });
    }

    /**
     * @api
     *
     * @param array   $arr
     * @return bool
     */
    public static function is_array_assoc($arr)
    {
        if (!\is_array($arr)) {
            return false;
        }
        return (bool) \count(\array_filter(\array_keys($arr), 'is_string'));
    }

    /**
     * @api
     *
     * @param array   $array
     * @return stdClass
     */
    public static function array_to_object($array)
    {
        $obj = new stdClass();
        foreach ($array as $k => $v) {
            if (\is_array($v)) {
                $obj->{$k} = self::array_to_object($v); //RECURSION
            } else {
                $obj->{$k} = $v;
            }
        }
        return $obj;
    }

    /**
     * @api
     *
     * @param array   $array
     * @param string  $key
     * @param mixed   $value
     * @return bool|int
     */
    public static function get_object_index_by_property($array, $key, $value)
    {
        if (\is_array($array)) {
            $i = 0;
            foreach ($array as $arr) {
                if (\is_array($arr)) {
                    if ($arr[$key] == $value) {
                        return $i;
                    }
                } else {
                    if ($arr->$key == $value) {
                        return $i;
                    }
                }
                $i++;
            }
        }
        return false;
    }

    /**
     * @api
     *
     * @param array   $array
     * @param string  $key
     * @param mixed   $value
     * @return array|null
     * @throws Exception
     */
    public static function get_object_by_property($array, $key, $value)
    {
        if (\is_array($array)) {
            foreach ($array as $arr) {
                if ($arr->$key == $value) {
                    return $arr;
                }
            }
            return false;
        }
        throw new InvalidArgumentException('$array is not an array, got:');
    }

    /**
     * @api
     *
     * @param array   $array
     * @param int     $len
     * @return array
     */
    public static function array_truncate($array, $len)
    {
        if (\sizeof($array) > $len) {
            $array = \array_splice($array, 0, $len);
        }
        return $array;
    }

    /* Bool Utilities
    ======================== */

    /**
     * @api
     *
     * @param mixed   $value
     * @return bool
     */
    public static function is_true($value)
    {
        if (isset($value)) {
            if (\is_string($value)) {
                $value = \strtolower($value);
            }
            if (($value == 'true' || $value === 1 || $value === '1' || $value == true) && $value !== false && $value !== 'false') {
                return true;
            }
        }
        return false;
    }

    /**
     * Is the number even? Let's find out.
     *
     * @api
     *
     * @param int $i number to test.
     * @return bool
     */
    public static function iseven($i)
    {
        return ($i % 2) === 0;
    }

    /**
     * Is the number odd? Let's find out.
     *
     * @api
     *
     * @param int $i number to test.
     * @return bool
     */
    public static function isodd($i)
    {
        return ($i % 2) !== 0;
    }

    /**
     * Plucks the values of a certain key from an array of objects
     *
     * @api
     *
     * @param array  $array
     * @param string $key
     *
     * @return array
     */
    public static function pluck($array, $key)
    {
        $return = [];
        foreach ($array as $obj) {
            if (\is_object($obj) && \method_exists($obj, $key)) {
                $return[] = $obj->$key();
            } elseif (\is_object($obj) && \property_exists($obj, $key)) {
                $return[] = $obj->$key;
            } elseif (\is_array($obj) && isset($obj[$key])) {
                $return[] = $obj[$key];
            }
        }
        return $return;
    }

    /**
     * Filters a list of objects, based on a set of key => value arguments.
     * Uses WordPress WP_List_Util's filter.
     *
     * @api
     * @since 1.5.3
     * @ticket #1594
     *
     * @param array        $list to filter.
     * @param string|array $args to search for.
     * @param string       $operator to use (AND, NOT, OR).
     * @return array
     */
    public static function wp_list_filter($list, $args, $operator = 'AND')
    {
        if (!\is_array($args)) {
            $args = [
                'slug' => $args,
            ];
        }

        if (!\is_array($list) && !\is_a($list, 'Traversable')) {
            return [];
        }

        $util = new WP_List_Util($list);
        return $util->filter($args, $operator);
    }

    /**
     * Converts a WP object (WP_Post, WP_Term) into its
     * equivalent Timber class (Timber\Post, Timber\Term).
     *
     * If no match is found the function will return the inital argument.
     *
     * @param mixed $obj WP Object
     * @return mixed Instance of equivalent Timber object, or the argument if no match is found
     */
    public static function convert_wp_object($obj)
    {
        if ($obj instanceof WP_Post) {
            static $postFactory;
            $postFactory = $postFactory ?: new PostFactory();
            return $postFactory->from($obj->ID);
        } elseif ($obj instanceof WP_Term) {
            return Timber::get_term($obj->term_id);
        } elseif ($obj instanceof WP_User) {
            return Timber::get_user($obj->ID);
        }

        return $obj;
    }
}
