<?php
namespace Sodino\Services;

use Sodino\Models\Banner;
use Sodino\Repositories\BannerRepository;

/**
 * Banner Service
 */
class BannerService {
    private $repository;

    public function __construct(BannerRepository $repository) {
        $this->repository = $repository;
    }

    public function getActiveBanners(array $context = []) {
        $position = $context['position'] ?? '';
        $cache_key = $this->getCacheKey($position, $context);
        $banners = wp_cache_get($cache_key, 'sodino_banners');

        if ($banners === false) {
            $banners = array_filter($this->repository->getEnabled(), function (Banner $banner) use ($context) {
                return $this->filterByPosition($banner, $context)
                    && $this->filterByTime($banner)
                    && $this->filterByUserType($banner)
                    && $this->filterByDevice($banner);
            });

            usort($banners, function (Banner $a, Banner $b) {
                return $b->priority <=> $a->priority;
            });

            wp_cache_set($cache_key, $banners, 'sodino_banners', MINUTE_IN_SECONDS);
        }

        $limit = isset($context['limit']) ? (int) $context['limit'] : 1;
        return $limit > 0 ? array_slice($banners, 0, $limit) : $banners;
    }

    public function filterByTime(Banner $banner) {
        $now = current_time('timestamp');

        if (!empty($banner->start_time)) {
            $start = strtotime($banner->start_time);
            if ($start !== false && $now < $start) {
                return false;
            }
        }

        if (!empty($banner->end_time)) {
            $end = strtotime($banner->end_time);
            if ($end !== false && $now > $end) {
                return false;
            }
        }

        return true;
    }

    public function filterByUserType(Banner $banner) {
        if ($banner->user_target === 'all') {
            return true;
        }

        $userType = is_user_logged_in() ? 'returning' : 'new';

        return $banner->user_target === $userType;
    }

    public function filterByDevice(Banner $banner) {
        if ($banner->device_target === 'all') {
            return true;
        }

        $device = wp_is_mobile() ? 'mobile' : 'desktop';
        return $banner->device_target === $device;
    }

    public function filterByPosition(Banner $banner, array $context) {
        if (empty($context['position'])) {
            return false;
        }

        if ($banner->position !== $context['position']) {
            return false;
        }

        if ($banner->position === 'product_page' && !is_singular('product')) {
            return false;
        }

        if ($banner->position === 'cart' && !is_cart()) {
            return false;
        }

        return true;
    }

    public function increaseImpression($bannerId) {
        $this->repository->incrementImpression($bannerId);
    }

    public function increaseClick($bannerId) {
        $this->repository->incrementClick($bannerId);
    }

    private function getCacheKey($position, array $context) {
        $version = wp_cache_get('version', 'sodino_banners');
        if ($version === false) {
            $version = get_option('sodino_banners_cache_version', 1);
            wp_cache_set('version', $version, 'sodino_banners');
        }

        $runtimeContext = [
            'user' => is_user_logged_in() ? 'returning' : 'new',
            'device' => wp_is_mobile() ? 'mobile' : 'desktop',
            'minute' => gmdate('YmdHi', current_time('timestamp', true)),
        ];

        return 'sodino_active_banners_' . md5($version . '|' . $position . '|' . wp_json_encode($context) . '|' . wp_json_encode($runtimeContext));
    }
}