<?php
namespace Core;

/**
 * 主题引擎：后台可设置任意网页风格（颜色 / 字体 / 圆角 / 容器 / 导航 / 明暗 / 自定义CSS）
 * 渲染前台时通过 CSS 变量注入；保存后重新生成 public/assets/css/theme.css
 */
class Theme
{
    private static $cache = null;
    private static $cssPath = BASE_PATH . '/public/assets/css/theme.css';

    public static function defaults(): array
    {
        return [
            // 站点信息
            'site_name'      => '酷冰甲 · 降温服',
            'site_slogan'    => '科技降温 · 清凉一夏',
            'site_logo'      => '',
            'contact_phone'  => '400-1783-998',
            'contact_email'  => 'service@coolcoth.com',
            'contact_address'=> '江苏省苏州市工业园区',
            'icp'            => '',
            'seo_title'      => '酷冰甲降温服 - 科技降温服装定制',
            'seo_keywords'   => '降温服, cooling clothing, 降温工作服, 清凉服定制',
            'seo_description'=> '酷冰甲专注降温服研发与定制，采用相变蓄冷与循环水冷技术，为高温作业人群提供清凉解决方案。',
            // 主题风格
            'preset'         => 'ocean',
            'primary'        => '#0ea5e9',
            'primary_600'    => '#0284c7',
            'secondary'      => '#14b8a6',
            'accent'         => '#f59e0b',
            'bg'             => '#ffffff',
            'surface'        => '#f8fafc',
            'text'           => '#0f172a',
            'muted'          => '#64748b',
            'border'         => '#e2e8f0',
            'nav_bg'         => 'rgba(255,255,255,0.72)',
            'font'           => "'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif",
            'radius'         => '16',
            'container'      => '1200',
            'header'         => 'center',   // center | left | transparent
            'default_mode'   => 'light',    // light | dark
            'custom_css'     => '',
        ];
    }

    /** 合并默认值与数据库设置 */
    public static function all(): array
    {
        if (self::$cache !== null) return self::$cache;
        $def = self::defaults();
        $setting = new \App\Models\Setting();
        $saved = $setting->allKV();
        self::$cache = array_merge($def, $saved);
        return self::$cache;
    }

    public static function get(string $key, $default = '')
    {
        $all = self::all();
        return $all[$key] ?? $default;
    }

    public static function clearCache(): void
    {
        self::$cache = null;
    }

    /** 预设主题（后台一键套用） */
    public static function presets(): array
    {
        return [
            'ocean'   => ['label' => '海洋蓝', 'vars' => ['primary'=>'#0ea5e9','primary_600'=>'#0284c7','secondary'=>'#14b8a6','accent'=>'#f59e0b','bg'=>'#ffffff','surface'=>'#f8fafc','text'=>'#0f172a','muted'=>'#64748b','border'=>'#e2e8f0','nav_bg'=>'rgba(255,255,255,0.72)']],
            'forest'  => ['label' => '森野绿', 'vars' => ['primary'=>'#16a34a','primary_600'=>'#15803d','secondary'=>'#0d9488','accent'=>'#f97316','bg'=>'#ffffff','surface'=>'#f6fdf8','text'=>'#0f172a','muted'=>'#5b7065','border'=>'#dcefe2','nav_bg'=>'rgba(255,255,255,0.72)']],
            'aurora'  => ['label' => '极光紫', 'vars' => ['primary'=>'#8b5cf6','primary_600'=>'#7c3aed','secondary'=>'#06b6d4','accent'=>'#ec4899','bg'=>'#ffffff','surface'=>'#faf7ff','text'=>'#1e1b2e','muted'=>'#6b6480','border'=>'#ece6f7','nav_bg'=>'rgba(255,255,255,0.72)']],
            'sunset'  => ['label' => '日落橙', 'vars' => ['primary'=>'#f97316','primary_600'=>'#ea580c','secondary'=>'#ef4444','accent'=>'#facc15','bg'=>'#ffffff','surface'=>'#fffaf3','text'=>'#1c1917','muted'=>'#78716c','border'=>'#faead7','nav_bg'=>'rgba(255,255,255,0.72)']],
            'mono'    => ['label' => '极简黑金', 'vars' => ['primary'=>'#111827','primary_600'=>'#000000','secondary'=>'#ca8a04','accent'=>'#ca8a04','bg'=>'#ffffff','surface'=>'#fafafa','text'=>'#111827','muted'=>'#6b7280','border'=>'#e5e7eb','nav_bg'=>'rgba(255,255,255,0.75)']],
            'ice'     => ['label' => '冰晶青', 'vars' => ['primary'=>'#06b6d4','primary_600'=>'#0891b2','secondary'=>'#3b82f6','accent'=>'#22d3ee','bg'=>'#ffffff','surface'=>'#f0fbfd','text'=>'#0c1a24','muted'=>'#5b7686','border'=>'#d3eef5','nav_bg'=>'rgba(255,255,255,0.72)']],
        ];
    }

    /** 生成 theme.css 文本 */
    public static function buildCss(): string
    {
        $t = self::all();
        $v = function ($k) use ($t) { return $t[$k] ?? ''; };
        $css = ":root{\n";
        $css .= "  --c-primary:{$v('primary')};\n";
        $css .= "  --c-primary-600:{$v('primary_600')};\n";
        $css .= "  --c-secondary:{$v('secondary')};\n";
        $css .= "  --c-accent:{$v('accent')};\n";
        $css .= "  --c-bg:{$v('bg')};\n";
        $css .= "  --c-surface:{$v('surface')};\n";
        $css .= "  --c-text:{$v('text')};\n";
        $css .= "  --c-muted:{$v('muted')};\n";
        $css .= "  --c-border:{$v('border')};\n";
        $css .= "  --nav-bg:{$v('nav_bg')};\n";
        $css .= "  --font-base:{$v('font')};\n";
        $css .= "  --radius:{$v('radius')}px;\n";
        $css .= "  --container:{$v('container')}px;\n";
        $css .= "}\n";
        $css .= "[data-theme=\"dark\"]{\n";
        $css .= "  --c-bg:#0b1120;--c-surface:#111827;--c-text:#e5e7eb;--c-muted:#94a3b8;--c-border:#1f2937;--nav-bg:rgba(11,17,32,0.72);\n";
        $css .= "}\n";
        $css .= $v('custom_css') . "\n";
        return $css;
    }

    /** 重新生成主题 CSS 文件 */
    public static function regenerate(): bool
    {
        $dir = dirname(self::$cssPath);
        if (!is_dir($dir)) mkdir($dir, 0755, true);
        return (bool) file_put_contents(self::$cssPath, self::buildCss());
    }
}