<?php
defined( 'ABSPATH' ) || exit;

/**
 * White-label settings for the CitedSEO agency/reseller model.
 *
 * When white-label is enabled, the plugin swaps its own branding (logo,
 * name, footer credit, primary color) for the agency's brand.
 * When language is set to 'ar', the admin interface flips to Arabic RTL.
 *
 * Settings are stored in a single wp_options row: awbseo_white_label.
 */
class AWBSEO_White_Label {

    const OPTION_KEY = 'awbseo_white_label';

    /** Default values -- used when option is not yet saved. */
    private static function defaults(): array {
        return [
            'enabled'       => false,
            'language'      => 'en',
            'agency_name'   => '',
            'logo_id'       => 0,
            'primary_color' => '#871a37',
            'hide_footer'   => false,
            'hide_badge'    => false,
        ];
    }

    public static function init(): void {
        add_action( 'wp_ajax_awbseo_save_white_label', [ __CLASS__, 'ajax_save' ] );
        add_filter( 'admin_body_class',                [ __CLASS__, 'filter_body_class' ] );
        add_action( 'admin_enqueue_scripts',           [ __CLASS__, 'enqueue_arabic_font' ] );

        // Auto-detect Arabic (via WPML, Polylang, or the site locale) and
        // keep the CitedSEO admin language in sync, unless the site owner
        // has turned auto-detection off in Settings.
        add_action( 'admin_init', [ __CLASS__, 'maybe_auto_switch_language' ], 5 );
    }

    /**
     * Loads Cairo from Google Fonts -- the same typeface used everywhere
     * else in CitedSEO (general admin RTL layout, meta box, and the PRO
     * white-label client reports), so Arabic text renders in one consistent
     * font across the whole plugin instead of switching typefaces between
     * screens.
     *
     * Loaded when the admin language is set to Arabic, and unconditionally
     * on the post editor screens (post.php / post-new.php) so the CitedSEO
     * meta box always renders Arabic post content (title, description,
     * SERP preview) in Cairo even when the editor's own interface language
     * is English -- editing Arabic client content from an English admin UI
     * is the common case for agency use.
     */
    public static function enqueue_arabic_font( $hook = '' ): void {
        $on_editor_screen = in_array( $hook, [ 'post.php', 'post-new.php' ], true );
        if ( ! self::is_arabic() && ! $on_editor_screen ) {
            return;
        }
        wp_enqueue_style(
            'awbseo-cairo-arabic',
            'https://fonts.googleapis.com/css2?family=Cairo:wght@400;600;700&display=swap',
            [],
            null
        );
    }

    /** Return the full white-label config, merged with defaults. */
    public static function get(): array {
        return wp_parse_args(
            (array) get_option( self::OPTION_KEY, [] ),
            self::defaults()
        );
    }

    public static function is_enabled(): bool {
        return (bool) self::get()['enabled'];
    }

    /**
     * True when the admin language is set to Arabic.
     * Reads from the general settings so it works independently of white-label.
     * Falls back to the white-label option for backward compatibility.
     */
    public static function is_arabic(): bool {
        $s = get_option( 'awbseo_settings', [] );
        if ( isset( $s['admin_language'] ) ) {
            return $s['admin_language'] === 'ar';
        }
        // Backward compat: check white-label option.
        $wl = self::get();
        return $wl['enabled'] && ( $wl['language'] ?? 'en' ) === 'ar';
    }

    /**
     * The name to show wherever the plugin references itself.
     * Returns the agency name when white-label is active, 'CitedSEO' otherwise.
     */
    public static function brand_name(): string {
        $wl = self::get();
        if ( $wl['enabled'] && trim( $wl['agency_name'] ) !== '' ) {
            return sanitize_text_field( $wl['agency_name'] );
        }
        return 'CitedSEO';
    }

    /**
     * URL of the logo to use in the admin.
     * Falls back to the CitedSEO icon when white-label is off or no logo set.
     */
    public static function logo_url(): string {
        $wl = self::get();
        if ( $wl['enabled'] && absint( $wl['logo_id'] ) ) {
            $src = wp_get_attachment_image_url( absint( $wl['logo_id'] ), 'thumbnail' );
            if ( $src ) {
                return $src;
            }
        }
        return AWBSEO_PLUGIN_URL . 'admin/assets/icon-256x256.png';
    }

    /**
     * The primary brand color (hex) to inject as a CSS variable.
     */
    public static function primary_color(): string {
        $wl    = self::get();
        $color = $wl['enabled'] && $wl['primary_color'] ? $wl['primary_color'] : '#871a37';
        // Sanitize: must be 3- or 6-digit hex.
        if ( preg_match( '/^#[0-9a-fA-F]{3}$|^#[0-9a-fA-F]{6}$/', $color ) ) {
            return $color;
        }
        return '#871a37';
    }

    /**
     * CSS injected on every CitedSEO admin page.
     * White-label section: logo + accent color (requires white-label enabled).
     * RTL section: Arabic layout (independent - only requires admin_language = ar).
     */
    public static function inline_css(): string {
        $css = '';

        // White-label branding CSS (logo, colors).
        if ( self::is_enabled() ) {
            $logo  = esc_url( self::logo_url() );
            $color = esc_attr( self::primary_color() );
            $dark  = self::darken_hex( $color, 20 );

            $css .= "
:root {
    --awb-primary: {$color};
    --awb-primary-dark: {$dark};
}
#toplevel_page_awbseo .wp-menu-image img {
    content: url('{$logo}') !important;
}
.awb-page-header__logo {
    content: url('{$logo}') !important;
}
";
        } // end is_enabled()

        // Arabic RTL - independent of white-label; only requires admin_language = ar.
        if ( self::is_arabic() ) {
            $css .= "
/* ---- Arabic / RTL overrides ---- */
/* Force Cairo on everything inside CitedSEO admin pages -- matches the
   font used across the rest of the admin (admin-rtl.css) and in the PRO
   white-label client reports, so switching to Arabic never changes the
   typeface mid-plugin. */
body.awbseo-lang-ar,
body.awbseo-lang-ar *,
body.awbseo-lang-ar input,
body.awbseo-lang-ar textarea,
body.awbseo-lang-ar select,
body.awbseo-lang-ar button {
    font-family: 'Cairo', 'Segoe UI', Tahoma, Arial, sans-serif !important;
}
.awb-seo-wrap {
    direction: rtl;
    text-align: right;
    font-family: 'Cairo', 'Segoe UI', Tahoma, Arial, sans-serif !important;
}
.awb-seo-wrap .awb-page-header,
.awb-seo-wrap h1,
.awb-seo-wrap h2,
.awb-seo-wrap h3,
.awb-seo-wrap p,
.awb-seo-wrap label {
    text-align: right;
    direction: rtl;
}
.awb-seo-wrap .form-table th {
    text-align: right;
    padding-right: 0;
    padding-left: 20px;
}
.awb-seo-wrap .form-table td {
    text-align: right;
}
.awb-seo-wrap input[type=text],
.awb-seo-wrap input[type=email],
.awb-seo-wrap input[type=url],
.awb-seo-wrap input[type=number],
.awb-seo-wrap textarea,
.awb-seo-wrap select {
    direction: rtl;
    text-align: right;
}
.awb-seo-wrap .notice,
.awb-seo-wrap .description {
    text-align: right;
    direction: rtl;
}
.awb-seo-wrap table {
    direction: rtl;
}
.awb-seo-wrap table th,
.awb-seo-wrap table td {
    text-align: right;
}
/* Flip flex rows that use gap/align */
.awb-seo-wrap [style*='display:flex'],
.awb-seo-wrap [style*='display: flex'] {
    direction: rtl;
}
/* Keep CitedSEO brand name left-aligned in sidebar (it's an English brand name) */
#toplevel_page_awbseo .wp-menu-name {
    direction: ltr;
    text-align: left;
}
";
        }

        return $css;
    }

    // ---- Body class ---------------------------------------------------------------

    /**
     * Adds awbseo-lang-ar to <body> when Arabic mode is active.
     * Lets external CSS and JS detect the language without reading PHP options.
     */
    public static function filter_body_class( string $classes ): string {
        if ( self::is_arabic() ) {
            $classes .= ' awbseo-lang-ar';
        }
        return $classes;
    }

    // ---- Auto language detection ---------------------------------------------------

    /**
     * Detect an active translation/multilingual plugin.
     * Returns the plugin's display name, or '' when none is detected.
     */
    public static function detect_translation_plugin(): string {
        if ( defined( 'ICL_SITEPRESS_VERSION' ) || function_exists( 'icl_get_languages' ) ) {
            return 'WPML';
        }
        if ( defined( 'POLYLANG_VERSION' ) || function_exists( 'pll_default_language' ) ) {
            return 'Polylang';
        }
        return '';
    }

    /**
     * Detect the site's primary/default language as a two-letter code.
     * Prefers WPML or Polylang's configured default language (so a
     * multilingual site with a non-Arabic admin locale but an Arabic
     * default front-end language is still detected correctly), and
     * falls back to the WordPress site locale.
     */
    public static function detect_site_language(): string {
        if ( function_exists( 'icl_get_languages' ) ) {
            $default = apply_filters( 'wpml_default_language', null );
            if ( $default ) {
                return strtolower( substr( $default, 0, 2 ) );
            }
        }

        if ( function_exists( 'pll_default_language' ) ) {
            $default = pll_default_language( 'slug' );
            if ( $default ) {
                return strtolower( substr( $default, 0, 2 ) );
            }
        }

        return strtolower( substr( get_locale(), 0, 2 ) );
    }

    /**
     * Detects the language of ONE SPECIFIC POST via Polylang or WPML, if
     * either is active. Independent of detect_site_language() above, which
     * only ever reports the site's overall default language -- this looks
     * at the post actually being edited, so an English-default multilingual
     * site with an Arabic translation of a page is still detected
     * correctly for that one post.
     *
     * Returns a two-letter language code (e.g. 'ar', 'en') or '' when no
     * supported multilingual plugin is active, or the post has no language
     * assigned yet.
     */
    public static function get_post_language( int $post_id ): string {
        if ( function_exists( 'pll_get_post_language' ) ) {
            $lang = pll_get_post_language( $post_id, 'slug' );
            if ( $lang ) {
                return strtolower( substr( $lang, 0, 2 ) );
            }
        }

        if ( has_filter( 'wpml_post_language_details' ) ) {
            $details = apply_filters( 'wpml_post_language_details', null, $post_id );
            if ( is_array( $details ) && ! empty( $details['language_code'] ) ) {
                return strtolower( substr( $details['language_code'], 0, 2 ) );
            }
        }

        return '';
    }

    /**
     * True when Polylang or WPML is active AND this specific post's
     * language is Arabic. Used to switch the meta box's own UI chrome
     * (labels, hints, buttons -- not the post's actual title/description
     * content, which is only ever whatever the editor typed) into Arabic
     * for that one post, regardless of the site's default language or the
     * plugin's own admin-interface language setting (is_arabic() above).
     */
    public static function is_post_arabic( int $post_id ): bool {
        return 'ar' === self::get_post_language( $post_id );
    }

    /**
     * Keeps the CitedSEO admin language in sync with the site's detected
     * language whenever auto-detection is on (the default). Runs on every
     * admin_init so it reacts the moment WPML/Polylang is installed, its
     * default language is changed, or the site locale changes -- without
     * requiring the site owner to find the Settings toggle themselves.
     *
     * A site owner who explicitly turns "Auto-detect Language" off in
     * Settings is left alone; their manual choice is never overwritten.
     */
    public static function maybe_auto_switch_language(): void {
        $settings = get_option( 'awbseo_settings', [] );

        // Missing key = pre-existing install from before this feature shipped;
        // default it to "on" so everyone benefits without a manual opt-in.
        if ( empty( $settings['admin_language_auto'] ) && isset( $settings['admin_language_auto'] ) ) {
            return;
        }

        $target = ( 'ar' === self::detect_site_language() ) ? 'ar' : 'en';

        if ( ( $settings['admin_language'] ?? 'en' ) !== $target ) {
            $settings['admin_language'] = $target;
            update_option( 'awbseo_settings', $settings );
        }
    }

    // ---- Locale filter ------------------------------------------------------------

    /**
     * Forces the plugin text domain to load Arabic translations when the
     * white-label language is set to 'ar', regardless of the site locale.
     *
     * Registered below (outside the class) so it fires before load_plugin_textdomain().
     */
    public static function filter_locale( string $locale, string $domain ): string {
        if ( $domain === 'adworksbid-seo' && self::is_arabic() ) {
            return 'ar';
        }
        return $locale;
    }

    // ---- Hex helpers --------------------------------------------------------------

    /**
     * Very lightweight hex darkening: subtract $amount from each R/G/B channel.
     */
    private static function darken_hex( string $hex, int $amount ): string {
        $hex = ltrim( $hex, '#' );
        if ( strlen( $hex ) === 3 ) {
            $hex = $hex[0] . $hex[0] . $hex[1] . $hex[1] . $hex[2] . $hex[2];
        }
        $r = max( 0, hexdec( substr( $hex, 0, 2 ) ) - $amount );
        $g = max( 0, hexdec( substr( $hex, 2, 2 ) ) - $amount );
        $b = max( 0, hexdec( substr( $hex, 4, 2 ) ) - $amount );
        return sprintf( '#%02x%02x%02x', $r, $g, $b );
    }

    // ---- AJAX ------------------------------------------------------------------

    public static function ajax_save(): void {
        check_ajax_referer( 'awbseo_admin', 'nonce' );
        if ( ! current_user_can( 'manage_options' ) ) {
            wp_send_json_error( 'Permission denied.' );
        }

        $allowed_langs = [ 'en', 'ar' ];

        $data = [
            'enabled'       => ! empty( $_POST['enabled'] ),
            'language'      => in_array( $_POST['language'] ?? 'en', $allowed_langs, true ) ? sanitize_key( $_POST['language'] ) : 'en',
            'agency_name'   => sanitize_text_field( $_POST['agency_name'] ?? '' ),
            'logo_id'       => absint( $_POST['logo_id'] ?? 0 ),
            'primary_color' => sanitize_hex_color( $_POST['primary_color'] ?? '#871a37' ) ?: '#871a37',
            'hide_footer'   => ! empty( $_POST['hide_footer'] ),
            'hide_badge'    => ! empty( $_POST['hide_badge'] ),
        ];

        update_option( self::OPTION_KEY, $data );
        wp_send_json_success( $data );
    }
}

// Register locale filter early -- must fire before load_plugin_textdomain().
// Running here (on file include, before any action hooks) guarantees timing.
add_filter( 'plugin_locale', [ 'AWBSEO_White_Label', 'filter_locale' ], 1, 2 );