<?php

namespace Hurrytimer;

class WCCampaign
{
    /**
     * Returns array of campaigns with WC Enabled.
     *
     * @return array
     */
    public function findWCCampaigns()
    {
        $posts = get_posts([
            'post_type'        => HURRYT_POST_TYPE,
            'numberposts'      => -1,
            'post_status'      => 'publish',
            'meta_key'         => 'wc_enable',
            'meta_value'       => C::YES,
            'suppress_filters' => false,
        ]);

        return array_map(function ($post) {
            return new Campaign($post->ID);
        }, $posts);
    }


    /**
     * Run campaign for then given product page.
     *
     * @param $productId
     */
    public function run($productId)
    {

        $compaigns = $this->findWCCampaigns();

        foreach ($compaigns as $compaign) {

            if ($this->hasActiveCampaign($compaign, $productId)) {
                add_action(
                    'woocommerce_single_product_summary',
                    function () use ($compaign) { $this->renderShortcode($compaign); },
                    $compaign->getWcPosition(),
                    [$compaign->getId()]
                );
            }
        }
    }


    /**
     * Check if given product has an active campaign.
     *
     * @param Campaign $campaign
     * @param          $productId
     *
     * @return bool
     */
    public function hasActiveCampaign(
        $campaign,
        $productId
    ) {
        if ( ! $campaign->isWcEnabled()) {
            return false;
        }
        $categories = $this->getProductsCategories($productId);

        $type = $campaign->getWcProductsSelectionType();

        switch ($type) {
            case C::WC_PS_TYPE_ALL:
                return true;

            case C::WC_PS_TYPE_INCLUDE_PRODUCTS:
                return in_array($productId, $campaign->getWcProductsSelection());

            case C::WC_PS_TYPE_EXCLUDE_PRODUCTS:
                return ! in_array($productId, $campaign->getWcProductsSelection());

            case C::WC_PS_TYPE_INCLUDE_CATEGORIES:
                $included_categories = $campaign->getWcProductsSelection();
                $callback            = function ($id)
                use ($categories) {
                    return in_array($id, $categories);
                };
                $results             = array_filter($included_categories, $callback);

                return count($results) > 0;

            case C::WC_PS_TYPE_EXCLUDE_CATEGORIES:
                $excluded_categories = $campaign->getWcProductsSelection();
                $results             = array_filter($excluded_categories, function (
                    $id
                ) use ($categories) {
                    return ! in_array($id, $categories);
                });

                return count($results) > 0;

            default:
                return false;
        }
    }


    /**
     * Returns categories ids for the given product.
     *
     * @param $product_id
     *
     * @return array|\WP_Error
     */
    public function getProductsCategories($product_id)
    {
        return wp_get_object_terms($product_id, 'product_cat', [
            'fields' => 'ids',
        ]);
    }

    /**
     * Render shortcode for the given campaign ID.
     *
     * @param Campaign $campaign
     */
    public function renderShortcode($campaign)
    {
        $shortcode = '[hurrytimer id=' . $campaign->getId() . ']';
        echo do_shortcode($shortcode);
    }

    /**
     * Change stock status.
     *
     * @param $campaign \Hurrytimer\Campaign
     * @param $stockStatus
     */
    function changeStockStatus($campaign, $stockStatus)
    {

        if ( ! $campaign->isWcEnabled()) {
            return;
        }

        $products = $this->getProductsIdsByCampaign($campaign);
        foreach ($products as $product) {
            $product->set_stock_status($stockStatus);
            $product->save();
        }
    }

    /**
     * Get campaign's products ID.
     *
     * @param \Hurrytimer\Campaign $campaign
     *
     * @return \WC_Product[]
     */
    private function getProductsIdsByCampaign($campaign)
    {
        $products  = [];
        $selection = $campaign->getWcProductsSelection();
        $type      = $campaign->getWcProductsSelectionType();
        switch ($type) {
            case C::WC_PS_TYPE_ALL:
                $products = wc_get_products(['status' => 'publish']);
                break;
            case C::WC_PS_TYPE_EXCLUDE_PRODUCTS:
                $products = wc_get_products([
                    'status'  => 'publish',
                    'exclude' => $selection,
                ]);
                break;
            case C::WC_PS_TYPE_INCLUDE_PRODUCTS:
                $products = wc_get_products(['status' => 'publish', 'include' => $selection]);
                break;
            case C::WC_PS_TYPE_INCLUDE_CATEGORIES:
                $categories = get_terms([
                    'taxonomy' => 'product_cat',
                    'include'  => implode(',', $selection),
                    'fields'   => 'slugs',
                ]);
                $products   = wc_get_products(['status' => 'publish', 'category' => $categories]);
                break;
            case C::WC_PS_TYPE_EXCLUDE_CATEGORIES:
                $categories = get_terms([
                    'taxonomy' => 'product_cat',
                    'exclude'  => implode(',', $selection),
                    'fields'   => 'slugs',
                ]);
                $products   = wc_get_products(['status' => 'publish', 'category' => $categories]);
                break;
        }

        return $products;
    }
}