<?php
/**
 * AKSRT Inline Style Builder
 *
 * Outputs runtime CSS custom properties (design tokens) into wp_head.
 * Extracted from AKSRT_Scripts to reduce that class's line count.
 *
 * @package AKSRT
 * @since   3.4.0
 */

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

class AKSRT_Inline_Style_Builder {

    public function output(): void {
        $logo_url       = class_exists('AKSRT_Settings') ? AKSRT_Settings::logo_url() : (string) aksrt_get_setting('logo_url', '');
        $dark_logo_url  = class_exists('AKSRT_Settings') ? AKSRT_Settings::logo_dark_url() : (string) aksrt_get_setting('site_logo_dark', '');
        $favicon        = class_exists('AKSRT_Settings') ? AKSRT_Settings::favicon_url() : (string) aksrt_get_setting('favicon_url', '');
        $primary_color  = class_exists('AKSRT_Settings') ? AKSRT_Settings::resolved_primary_color() : '#f04494';
        $dark_primary   = class_exists('AKSRT_Settings') ? AKSRT_Settings::dark_primary_color() : '#f04494';
        $border_radius  = class_exists('AKSRT_Settings') ? AKSRT_Settings::border_radius() : 8;
        $card_radius    = class_exists('AKSRT_Settings') ? AKSRT_Settings::card_radius() : ($border_radius + 4);
        $container_max  = class_exists('AKSRT_Settings') ? AKSRT_Settings::container_max_width() : 1200;
        $font_family    = class_exists('AKSRT_Settings') ? AKSRT_Settings::font_family() : 'system';
        $logo_width     = class_exists('AKSRT_Settings') ? AKSRT_Settings::logo_width() : 150;
        $sidebar_cfg    = class_exists('AKSRT_Settings') ? AKSRT_Settings::get_sidebar_config() : ['width' => 311, 'enabled' => true, 'position' => 'right'];

        $content_width           = $container_max === 0 ? '100%' : $container_max . 'px';
        $content_no_sidebar_max  = $container_max === 0 ? '100%' : max(860, $container_max - 220) . 'px';
        $container_wide          = $container_max === 0 ? '100%' : max(1280, $container_max + 160) . 'px';
        $radius_sm               = max(0, $border_radius - 2);
        $radius_lg               = $border_radius + 4;
        $radius_xl               = $border_radius + 10;
        $rgb                     = $this->hex_to_rgb($primary_color);
        $primary_hover           = $this->adjust_hex_color($primary_color, -0.12);
        $primary_active          = $this->adjust_hex_color($primary_color, -0.22);
        $font_stacks             = $this->resolve_font_stacks($font_family);

        $dark_rgb    = $this->hex_to_rgb($dark_primary);
        $dark_hover  = $this->adjust_hex_color($dark_primary, -0.12);
        $dark_active = $this->adjust_hex_color($dark_primary, -0.22);

        $layout_vars = [
            '--content-max'            => $content_width,
            '--content-no-sidebar-max' => $content_no_sidebar_max,
            '--container'              => $content_width,
            '--container-wide'         => $container_wide,
            '--sidebar-width'          => $sidebar_cfg['width'] . 'px',
            '--color-primary'          => $primary_color,
            '--color-primary-hover'    => $primary_hover,
            '--color-primary-active'   => $primary_active,
            '--color-primary-soft'     => sprintf('rgba(%d, %d, %d, 0.12)', $rgb[0], $rgb[1], $rgb[2]),
            '--color-primary-softer'   => sprintf('rgba(%d, %d, %d, 0.06)', $rgb[0], $rgb[1], $rgb[2]),
            '--color-primary-rgb'      => implode(', ', $rgb),
            '--focus-color'            => $primary_color,
            '--radius-sm'              => $radius_sm . 'px',
            '--radius'                 => $border_radius . 'px',
            '--radius-card'            => $card_radius . 'px',
            '--main-radius'            => $card_radius . 'px',
            '--radius-btn'             => $border_radius . 'px',
            '--radius-code'            => $border_radius . 'px',
            '--radius-lg'              => $radius_lg . 'px',
            '--radius-xl'              => $radius_xl . 'px',
            '--shadow-md'              => '0 8px 24px rgba(20, 28, 48, 0.10)',
            '--font-body'              => $font_stacks['body'],
            '--font-display'           => $font_stacks['display'],
            '--font-ui'                => $font_stacks['ui'],
            '--font-heading'           => $font_stacks['ui'],
            '--aksrt-logo-width'       => $logo_width . 'px',
            '--posts-list-scale'       => (class_exists('AKSRT_Settings') ? AKSRT_Settings::get_post_list_style_settings()['list_scale'] ?? 70 : 70) . '%',
            '--posts-card-scale'       => (class_exists('AKSRT_Settings') ? AKSRT_Settings::get_post_list_style_settings()['card_scale'] ?? 70 : 70) . '%',
        ];

        echo '<style id="aksrt-runtime-vars">:root{';
        foreach ($layout_vars as $name => $value) {
            echo esc_html($name) . ':' . esc_attr($value) . ';';
        }
        if ($logo_url) {
            echo '--aksrt-logo-url:"' . esc_url($logo_url) . '";';
        }
        if ($dark_logo_url) {
            echo '--aksrt-logo-dark-url:"' . esc_url($dark_logo_url) . '";';
        }
        if ($favicon) {
            echo '--aksrt-favicon:"' . esc_url($favicon) . '";';
        }
        if ($dark_primary !== $primary_color) {
            echo '}html.dark{';
            echo '--color-primary:' . esc_attr($dark_primary) . ';';
            echo '--color-primary-hover:' . esc_attr($dark_hover) . ';';
            echo '--color-primary-active:' . esc_attr($dark_active) . ';';
            echo '--color-primary-soft:' . sprintf('rgba(%d,%d,%d,0.12)', $dark_rgb[0], $dark_rgb[1], $dark_rgb[2]) . ';';
            echo '--color-primary-softer:' . sprintf('rgba(%d,%d,%d,0.06)', $dark_rgb[0], $dark_rgb[1], $dark_rgb[2]) . ';';
            echo '--color-primary-rgb:' . esc_attr(implode(', ', $dark_rgb)) . ';';
            echo '--focus-color:' . esc_attr($dark_primary) . ';';
        }
        echo '}</style>' . "\n";
        if (class_exists('AKSRT_Settings') && !empty(AKSRT_Settings::get_value('close_backdrop', false))) {
            echo '<style id="aksrt-no-backdrop">.aksrt-header,.header-inner,.site-header,.mobile-nav-overlay,.modal-backdrop,.aksrt-drawer-overlay,.aksrt-float-btn,.sidebar-inner{backdrop-filter:none!important;-webkit-backdrop-filter:none!important;background-color:var(--bg-card,#fff)!important}</style>' . "\n";
        }
        echo '<style id="aksrt-runtime-components">'
            . '.aksrt-search-hot-keywords{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:12px;font-family:var(--font-ui);}'
            . '.aksrt-search-hot-keywords__label{font-size:12px;color:var(--color-ink-3);}'
            . '.aksrt-search-hot-keywords__list{display:flex;gap:8px;flex-wrap:wrap;}'
            . '.aksrt-search-hot-keywords__item{display:inline-flex;align-items:center;padding:4px 10px;border-radius:999px;background:var(--surface-2,#f3f4f6);color:var(--color-ink-2,#374151);font-size:12px;line-height:1.4;text-decoration:none;}'
            . '.aksrt-search-hot-keywords__item:hover{background:var(--color-primary,#2563eb);color:#fff;}'
            . '.site-footer__copyright--extra{margin-top:8px;opacity:.78;}'
            . '</style>' . "\n";
    }

    private function resolve_font_stacks(string $family): array {
        switch ($family) {
            case 'noto-sans-sc':
                return [
                    'body'    => '"Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif',
                    'display' => '"Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif',
                    'ui'      => 'Inter, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif',
                ];
            case 'noto-serif-sc':
                return [
                    'body'    => '"Noto Serif SC", Georgia, "Songti SC", serif',
                    'display' => '"Noto Serif SC", Georgia, "Songti SC", serif',
                    'ui'      => 'Inter, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif',
                ];
            default:
                return [
                    'body'    => '"Source Serif 4", "Noto Serif SC", Georgia, "Songti SC", "STSong", serif',
                    'display' => '"Source Serif 4", "Noto Serif SC", Georgia, "Songti SC", "STSong", serif',
                    'ui'      => 'Inter, Manrope, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif',
                ];
        }
    }

    private function hex_to_rgb(string $hex): array {
        $hex = ltrim($hex, '#');
        if (strlen($hex) === 3) {
            $hex = preg_replace('/(.)/', '$1$1', $hex);
        }
        if (!is_string($hex) || strlen($hex) !== 6) {
            return [136, 171, 218];
        }
        return [
            hexdec(substr($hex, 0, 2)),
            hexdec(substr($hex, 2, 2)),
            hexdec(substr($hex, 4, 2)),
        ];
    }

    private function adjust_hex_color(string $hex, float $amount): string {
        $rgb = $this->hex_to_rgb($hex);
        $adjusted = array_map(
            static function (int $channel) use ($amount): int {
                $base = $amount >= 0
                    ? $channel + ((255 - $channel) * $amount)
                    : $channel * (1 + $amount);
                return max(0, min(255, (int) round($base)));
            },
            $rgb
        );
        return sprintf('#%02X%02X%02X', $adjusted[0], $adjusted[1], $adjusted[2]);
    }
}