<?php

declare(strict_types=1);

namespace WordPress\CloudflareWorkersAiProvider\Admin;

use WordPress\CloudflareWorkersAiProvider\Backfill\Backfill;
use WordPress\CloudflareWorkersAiProvider\Embeddings\Settings as EmbeddingSettings;
use WordPress\CloudflareWorkersAiProvider\Features\Settings;

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

/**
 * Features (2.0): one card per feature, each with a switch state and a way in. A feature's own
 * page holds its settings, saved as that feature's own tab.
 */
final class FeaturesPage
{
    public const SLUG = 'aipcf-features';

    public static function url(string $feature = ''): string
    {
        return add_query_arg(array_filter(['page' => self::SLUG, 'feature' => $feature]), admin_url('admin.php'));
    }

    /**
     * The features in the order they are shown.
     *
     * @return array<string, array{title: string, text: string, on: bool, url: string, index: bool, tab: string, screen: callable|null, section: string, after?: callable}>
     */
    public static function features(): array
    {
        return [
            'assistant' => [
                'title'   => __('Site assistant', 'aipcf-ai-provider-for-cloudflare'),
                'text'    => __('A chat that answers questions from your posts and links to them.', 'aipcf-ai-provider-for-cloudflare'),
                'on'      => !empty(Settings::get('chat_enabled')),
                'url'     => AssistantPage::pageUrl(),
                'index'   => true,
                'tab'     => '',
                'screen'  => null,
                'section' => '',
            ],
            'related'   => [
                'title'   => __('Related posts', 'aipcf-ai-provider-for-cloudflare'),
                'text'    => __('Lists the posts closest in meaning, under each post. Uses no neurons.', 'aipcf-ai-provider-for-cloudflare'),
                'on'      => !empty(Settings::get('related_enabled')),
                'url'     => self::url('related'),
                'index'   => true,
                'tab'     => 'related',
                'screen'  => [Screens\RelatedScreen::class, 'render'],
                'section' => 'aipcf_related',
            ],
            'search'    => [
                'title'   => __('Search', 'aipcf-ai-provider-for-cloudflare'),
                'text'    => __('Finds posts by meaning, not only by the words typed.', 'aipcf-ai-provider-for-cloudflare'),
                'on'      => !empty(Settings::get('search_enabled')),
                'url'     => self::url('search'),
                'index'   => true,
                'tab'     => 'search',
                'screen'  => [Screens\SearchScreen::class, 'render'],
                'section' => 'aipcf_search',
            ],
            'links'     => [
                'title'   => __('Link assistant', 'aipcf-ai-provider-for-cloudflare'),
                'text'    => __('Suggests internal links for a post, with the exact words to link.', 'aipcf-ai-provider-for-cloudflare'),
                'on'      => !empty(Settings::get('links_enabled')),
                'url'     => self::url('links'),
                'index'   => true,
                'tab'     => 'links',
                'screen'  => [Screens\LinksScreen::class, 'render'],
                'section' => 'aipcf_links',
            ],
            'insights'  => [
                'title'   => __('Search insights', 'aipcf-ai-provider-for-cloudflare'),
                'text'    => __('Records what people search for and shows what your posts do not answer yet.', 'aipcf-ai-provider-for-cloudflare'),
                'on'      => !empty(Settings::get('insights_enabled')),
                'url'     => self::url('insights'),
                'index'   => true,
                'tab'     => 'insights',
                'screen'  => [Screens\InsightsScreen::class, 'render'],
                'section' => 'aipcf_insights',
            ],
            'agents'    => [
                'title'   => __('AI agents', 'aipcf-ai-provider-for-cloudflare'),
                'text'    => __('Lets AI agents such as Claude and ChatGPT search and quote your site.', 'aipcf-ai-provider-for-cloudflare'),
                'on'      => !empty(Settings::get('agents_enabled')),
                'url'     => self::url('agents'),
                'index'   => true,
                'tab'     => 'agents',
                'screen'  => [Screens\AgentsScreen::class, 'render'],
                'section' => '',
                'after'   => [Screens\AgentsScreen::class, 'tryIt'],
            ],
            'backfill'  => [
                'title'   => __('Backfill', 'aipcf-ai-provider-for-cloudflare'),
                'text'    => __('Writes missing meta descriptions and image alt text in the background.', 'aipcf-ai-provider-for-cloudflare'),
                'on'      => Backfill::enabled(),
                'url'     => self::url('backfill'),
                'index'   => false,
                'tab'     => 'backfill',
                'screen'  => [Screens\BackfillScreen::class, 'render'],
                'section' => '',
            ],
        ];
    }

    public static function render(): void
    {
        if (!current_user_can('manage_options')) {
            return;
        }
        $features = self::features();
        $current  = isset($_GET['feature']) ? sanitize_key(wp_unslash((string) $_GET['feature'])) : ''; // phpcs:ignore WordPress.Security.NonceVerification.Recommended
        if (isset($features[$current]) && $features[$current]['tab'] !== '') {
            self::renderFeature($features[$current]);
            return;
        }

        echo '<div class="wrap aipcf-wrap aipcf-v2">';
        echo Ui::header(__('Features', 'aipcf-ai-provider-for-cloudflare'), __('What AIPCF does for your site. Each one is off until you switch it on.', 'aipcf-ai-provider-for-cloudflare'), SettingsPage::connectionPillUi()); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Ui escapes
        echo '<hr class="wp-header-end">';
        echo '<div class="aipcf-main aipcf-ui">';
        if (!EmbeddingSettings::enabled()) {
            echo Ui::notice(__('Most features search your content by meaning. Build the content index first, on Settings.', 'aipcf-ai-provider-for-cloudflare'), 'info'); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Ui escapes
        }
        $cards = '';
        foreach ($features as $f) {
            $needsIndex = $f['index'] && !EmbeddingSettings::enabled();
            $actions    = [['label' => $f['tab'] === '' ? __('Open', 'aipcf-ai-provider-for-cloudflare') : __('Settings', 'aipcf-ai-provider-for-cloudflare'), 'url' => $f['url']]];
            if ($needsIndex) {
                $actions[] = ['label' => __('Build the content index', 'aipcf-ai-provider-for-cloudflare'), 'url' => SettingsPage::settingsUrl('content-index'), 'kind' => 'link'];
            }
            $cards .= Ui::card($f['title'], Ui::actions($actions), [
                'text' => $f['text'],
                'pill' => $f['on'] ? ($needsIndex ? ['warn', __('Needs the content index', 'aipcf-ai-provider-for-cloudflare')] : ['ok', __('On', 'aipcf-ai-provider-for-cloudflare')]) : ['', __('Off', 'aipcf-ai-provider-for-cloudflare')],
            ]);
        }
        echo Ui::grid($cards); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Ui escapes
        echo '</div></div>';
    }

    /**
     * One feature's page: its settings, saved as its own tab.
     *
     * @param array{title: string, text: string, on: bool, url: string, index: bool, tab: string, screen: callable|null, section: string, after?: callable} $f
     */
    private static function renderFeature(array $f): void
    {
        echo '<div class="wrap aipcf-wrap aipcf-v2">';
        echo Ui::header($f['title'], $f['text'], $f['on'] ? ['ok', __('On', 'aipcf-ai-provider-for-cloudflare')] : ['', __('Off', 'aipcf-ai-provider-for-cloudflare')]); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Ui escapes
        echo '<hr class="wp-header-end">';
        echo Ui::back(__('Features', 'aipcf-ai-provider-for-cloudflare'), self::url()); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Ui escapes
        $html = $f['screen'] !== null
            ? (string) call_user_func($f['screen'])
            : SettingsPage::legacySections(SettingsPage::tabPage('content'), [$f['section']]);
        SettingsPage::form($f['tab'], $html);
        if (isset($f['after'])) {
            echo '<div class="aipcf-main aipcf-ui">' . (string) call_user_func($f['after']) . '</div>'; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Ui escapes
        }
        echo '</div>';
    }
}