<?php

declare(strict_types=1);

namespace App\View\Engine;

use Hyperf\View\Engine\EngineInterface;
use Smarty;
use RuntimeException;

class SmartyEngine implements EngineInterface
{
    protected Smarty $smarty;

    public function __construct(array $options = [])
    {
        $this->smarty = new Smarty();

        // 设置模板目录
        $this->smarty->setTemplateDir($options['template_dir'] ?? BASE_PATH . '/storage/view/');
        $this->smarty->setCompileDir($options['compile_dir'] ?? BASE_PATH . '/runtime/smarty/compile/');
        $this->smarty->setCacheDir($options['cache_dir'] ?? BASE_PATH . '/runtime/smarty/cache/');

        // 设置定界符
        $this->smarty->setLeftDelimiter($options['left_delimiter'] ?? '{{');
        $this->smarty->setRightDelimiter($options['right_delimiter'] ?? '}}');

        // 确保目录存在
        $this->ensureDirectoryExists($this->smarty->getCompileDir());
        $this->ensureDirectoryExists($this->smarty->getCacheDir());
    }

    protected function ensureDirectoryExists(string $path): void
    {
        if (!is_dir($path)) {
            mkdir($path, 0755, true);
        }
    }

    public function render(string $template, array $data, array $config): string
    {
        // 标准化模板路径
        $template = $this->normalizeTemplatePath($template);

        // 获取完整模板路径
        $templatePath = $this->smarty->getTemplateDir()[0] . $template;

        // 检查模板文件是否存在
        if (!file_exists($templatePath)) {
            throw new RuntimeException("Template file not found: {$templatePath}");
        }

        // 分配变量
        foreach ($data as $key => $value) {
            $this->smarty->assign($key, $value);
        }

        try {
            return $this->smarty->fetch($templatePath);
        } catch (\SmartyException $e) {
            throw new RuntimeException("Smarty render failed: " . $e->getMessage());
        }
    }

    protected function normalizeTemplatePath(string $path): string
    {
        // 移除可能的绝对路径前缀
        $path = str_replace(BASE_PATH, '', $path);
        // 移除开头的斜杠
        $path = ltrim($path, '/');
        // 确保使用正确的扩展名
        if (!str_ends_with($path, '.tpl')) {
            $path .= '.tpl';
        }
        return $path;
    }
}