<?php

if (!defined('ABSPATH')) {
    exit;
}

class AdGhost_Script_Injector {

    const GPT_URL = 'https://securepubads.g.doubleclick.net/tag/js/gpt.js';

    private $fallback_url = '';

    const HANDLES = ['adghost-gpt', 'adghost-runtime', 'adghost-devices'];

    public function init() {
        add_action('wp_enqueue_scripts', [$this, 'enqueue'], 5);
        add_filter('wp_resource_hints', [$this, 'resource_hints'], 10, 2);
        add_filter('script_loader_tag', [$this, 'runtime_tag'], 10, 2);

        add_filter('wp_script_attributes', [$this, 'script_attributes']);
        add_filter('wp_inline_script_attributes', [$this, 'script_attributes']);
        $patterns = ['adghost', 'gpt.js', 'googletag', 'AdGhostConfig', '__ADGHOST_CONFIG__'];
        $add = function ($list) use ($patterns) {
            return array_values(array_unique(array_merge((array) $list, $patterns)));
        };
        foreach (['rocket_delay_js_exclusions', 'rocket_exclude_js', 'rocket_exclude_defer_js', 'rocket_exclude_inline_js',
            'litespeed_optm_js_defer_exc', 'litespeed_optimize_js_excludes', 'litespeed_optm_gm_js_exc', 'sgo_javascript_combine_excluded_inline_content', 'sgo_js_async_exclude', 'perfmatters_delay_js_exclusions'] as $hook) {
            add_filter($hook, $add); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound -- other plugins' hooks.
        }
        add_filter('autoptimize_filter_js_exclude', function ($list) use ($patterns) {
            return trim((string) $list . ', ' . implode(', ', $patterns), ', ');
        });

        $css = function ($list) {
            return array_values(array_unique(array_merge((array) $list, ['.adghost-(.*)', '[data-adghost(.*)', '[data-agh-(.*)'])));
        };
        add_filter('rocket_rucss_safelist', $css);
        add_filter('litespeed_ucss_whitelist', function ($list) {
            return array_values(array_unique(array_merge((array) $list, ['.adghost-', '[data-adghost', '[data-agh-'])));
        });
    }

    public function script_attributes($attributes) {
        $id = (string) ($attributes['id'] ?? '');
        foreach (self::HANDLES as $handle) {
            if (strpos($id, $handle . '-js') === 0) {
                $attributes['data-cfasync']     = 'false';
                $attributes['data-no-optimize'] = '1';
                $attributes['data-no-defer']    = '1';
                $attributes['data-no-minify']   = '1';
                $attributes['data-noptimize']   = '1';
                $attributes['nowprocket']       = true;
                break;
            }
        }
        return $attributes;
    }

    private function is_preview() {
        return get_option('adghost_debug_mode', false) && current_user_can('manage_options');
    }

    public function enqueue() {
        if (is_admin() || (!$this->is_preview() && !get_option('adghost_is_active', false))) {
            return;
        }

        if (AdGhost_Helper::builder_preview()) {
            return;
        }

        if (!$this->is_preview() && AdGhost_Targeting::page_exclusion_reason() !== null) {
            return;
        }

        wp_enqueue_style('adghost-frontend', ADGHOST_PLUGIN_URL . 'assets/css/frontend.css', [], ADGHOST_VERSION);

        $label_color = AdGhost_Helper::ad_label_color();
        if ($label_color !== '') {
            wp_add_inline_style('adghost-frontend', ':root{--adghost-label-color:' . $label_color . '}');
        }

        $label_vars = '';
        if (get_option('adghost_ad_label_bold', false)) {
            $label_vars .= '--adghost-label-weight:700;';
        }
        $label_align = AdGhost_Helper::ad_label_align();
        if ($label_align !== '') {
            $label_vars .= '--adghost-label-align:' . $label_align . ';';
        }
        if ($label_vars !== '') {
            wp_add_inline_style('adghost-frontend', ':root{' . $label_vars . '}');
        }

        if (AdGhost_AMP::is_amp()) {
            return;
        }

        $generator = new AdGhost_Script_Generator();
        $config    = $generator->build_config();
        $device    = $config !== null
            ? AdGhost_Targeting::device_parts((array) json_decode(wp_json_encode($config['formats']), true), $generator->format_device_rules())
            : ['css' => '', 'js' => ''];

        $off = [];
        foreach (AdGhost_Helper::units() as $unit) {
            $family = ['anchor' => 'anchor', 'interstitial' => 'interstitial', 'reward' => 'rewarded'][AdGhost_Helper::get_unit_position($unit)] ?? null;

            if ($family !== null && AdGhost_Targeting::unit_exclusion_reason($unit) !== null) {
                $off[] = $family;
            }
        }
        if ($off) {
            $device['js'] .= '(function(c,o){c.formats=c.formats||{};o.forEach(function(k){c.formats[k]=c.formats[k]||{};c.formats[k].enabled=false;});})'
                . '(window.AdGhostConfig=window.AdGhostConfig||{},' . wp_json_encode(array_values(array_unique($off))) . ');';
        }

        if ($device['css'] !== '') {
            wp_add_inline_style('adghost-frontend', $device['css']);
        }

        if ($this->is_preview()) {

            wp_enqueue_style('adghost-preview', ADGHOST_PLUGIN_URL . 'assets/css/preview.css', ['adghost-frontend'], ADGHOST_VERSION);
            if ($device['js'] !== '') {
                wp_register_script('adghost-devices', false, [], ADGHOST_VERSION, false);
                wp_enqueue_script('adghost-devices');
                wp_add_inline_script('adghost-devices', $device['js']);
            }
            return;
        }

        // phpcs:ignore WordPress.WP.EnqueuedResourceParameters.MissingVersion
        wp_enqueue_script('adghost-gpt', self::GPT_URL, [], null, ['strategy' => 'async', 'in_footer' => false]);

        $local_url = $generator->get_local_script_url();

        $before    = $device['js'] . (class_exists('AdGhost_Key_Values') ? AdGhost_Key_Values::page_script() : '');

        if (AdGhost_Script_Generator::runtime_source() === 'custom' && $config !== null) {

            $build   = AdGhost_Script_Generator::engine_build();
            $before .= 'window.__ADGHOST_CONFIG__=' . wp_json_encode($config, JSON_HEX_TAG | JSON_HEX_AMP) . ';'
                . 'window.addEventListener("load",function(){var b=window.__ADGHOST_ENGINE_BUILD__;'
                . 'if(b&&b!==' . wp_json_encode($build) . '&&window.console){console.warn("[AdGhost] The self-hosted engine is from another plugin version. Download it again from AdGhost, Settings, General, Ad script.");}});';
            $this->fallback_url = (string) $local_url;

            // phpcs:ignore WordPress.WP.EnqueuedResourceParameters.MissingVersion
            wp_enqueue_script('adghost-runtime', AdGhost_Script_Generator::custom_runtime_url(), [], null, ['strategy' => 'async', 'in_footer' => false]);
        } elseif ($local_url) {

            // phpcs:ignore WordPress.WP.EnqueuedResourceParameters.MissingVersion
            wp_enqueue_script('adghost-runtime', $local_url, [], null, ['strategy' => 'async', 'in_footer' => false]);
        } else {

            $local_script = $generator->generate_local_script();
            if (!$local_script) {
                return;
            }
            wp_register_script('adghost-runtime', false, [], ADGHOST_VERSION, false);
            wp_enqueue_script('adghost-runtime');
            wp_add_inline_script('adghost-runtime', $local_script);
        }

        if ($before !== '') {
            wp_add_inline_script('adghost-runtime', $before, 'before');
        }
    }

    public function resource_hints($urls, $relation) {
        if (!in_array($relation, ['preconnect', 'dns-prefetch'], true) || is_admin() || !get_option('adghost_is_active', false)
            || $this->is_preview() || AdGhost_Targeting::page_exclusion_reason() !== null) {
            return $urls;
        }
        if ($relation === 'preconnect') {
            $urls[] = 'https://securepubads.g.doubleclick.net';
            $urls[] = 'https://pagead2.googlesyndication.com';
        } else {

            $urls[] = 'https://tpc.googlesyndication.com';
        }
        return $urls;
    }

    public function runtime_tag($tag, $handle) {

        if ($handle === 'adghost-gpt' && strpos($tag, ' src=') !== false) {
            return preg_replace('/<script(?=[^>]*\ssrc=)/', '<script onerror="window.__agGptErr=1"', $tag, 1);
        }
        if ($handle !== 'adghost-runtime' || $this->fallback_url === '' || strpos($tag, ' src=') === false) {
            return $tag;
        }
        $onerror = 'var s=document.createElement("script");s.async=true;s.src=' . wp_json_encode($this->fallback_url) . ';document.head.appendChild(s);';

        return preg_replace('/<script(?=[^>]*\ssrc=)/', '<script onerror="' . esc_attr($onerror) . '"', $tag, 1);
    }
}