<?php

namespace App\Core;

/**
 * NovaCore View Renderer
 * Simple PHP template engine
 */
class View
{
    private string $viewPath;
    private array $sharedData = [];

    public function __construct()
    {
        $this->viewPath = __DIR__ . '/../Modules';
    }

    /**
     * Render a view
     */
    public function render(string $view, array $data = []): string
    {
        $data = array_merge($this->sharedData, $data);

        // Get view file path
        $viewFile = $this->getViewFile($view);
        if (!file_exists($viewFile)) {
            throw new \Exception("View '{$view}' not found");
        }

        // Read view file content
        $content = file_get_contents($viewFile);

        // Process template syntax first
        $content = $this->processTemplate($content);

        // Debug: Log processed content
        if (getenv('APP_DEBUG') === 'true') {
            error_log("Processed template content: " . substr($content, 0, 500));
        }

        // Extract data to variables
        extract($data);

        // Start output buffering
        ob_start();

        // Evaluate processed content
        try {
            eval('?>' . $content);
        } catch (ParseError $e) {
            // Log the problematic content for debugging
            error_log("Template parse error: " . $e->getMessage());
            error_log("Problematic content around line " . $e->getLine() . ": " . substr($content, max(0, $e->getLine() - 10) * 50, 1000));
            throw $e;
        }

        // Get content and clean buffer
        return ob_get_clean();
    }

    /**
     * Get view file path
     */
    private function getViewFile(string $view): string
    {
        // Convert dot notation to path
        $view = str_replace('.', '/', $view);

        // Add .php extension if not present
        if (!str_ends_with($view, '.php')) {
            $view .= '.php';
        }

        return $this->viewPath . '/' . $view;
    }

    /**
     * Process template syntax
     */
    private function processTemplate(string $content): string
    {
        // Process {{ }} syntax (auto-escape)
        $content = preg_replace_callback('/\{\{\s*(.+?)\s*\}\}/', function ($matches) {
            $expression = trim($matches[1]);
            return '<?php echo htmlspecialchars(' . $expression . ', ENT_QUOTES, \'UTF-8\'); ?>';
        }, $content);

        // Process {!! !!} syntax (raw output)
        $content = preg_replace_callback('/\{!!\s*(.+?)\s*!!\}/', function ($matches) {
            $expression = trim($matches[1]);
            return '<?php echo ' . $expression . '; ?>';
        }, $content);

        // Process @if statements
        $content = preg_replace('/@if\s*\(\s*([^)]+)\s*\)/', '<?php if ($1): ?>', $content);
        $content = preg_replace('/@elseif\s*\(\s*([^)]+)\s*\)/', '<?php elseif ($1): ?>', $content);
        $content = preg_replace('/@else/', '<?php else: ?>', $content);
        $content = preg_replace('/@endif/', '<?php endif; ?>', $content);

        // Debug: Log processed @if statements
        if (getenv('APP_DEBUG') === 'true') {
            error_log("After @if processing: " . substr($content, 0, 1000));
        }

        // Process @foreach loops
        $content = preg_replace('/@foreach\s*\((.+?)\)/', '<?php foreach ($1): ?>', $content);
        $content = preg_replace('/@endforeach/', '<?php endforeach; ?>', $content);

        // Process @for loops
        $content = preg_replace('/@for\s*\((.+?)\)/', '<?php for ($1): ?>', $content);
        $content = preg_replace('/@endfor/', '<?php endfor; ?>', $content);

        // Process @while loops
        $content = preg_replace('/@while\s*\((.+?)\)/', '<?php while ($1): ?>', $content);
        $content = preg_replace('/@endwhile/', '<?php endwhile; ?>', $content);

        // Process @csrf directive
        $content = preg_replace('/@csrf/', '<?php echo csrf_token(); ?>', $content);

        // Process @method directive
        $content = preg_replace('/@method\s*\((.+?)\)/', '<?php echo method_field($1); ?>', $content);

        return $content;
    }

    /**
     * Share data with all views
     */
    public function share(string $key, $value): void
    {
        $this->sharedData[$key] = $value;
    }

    /**
     * Check if view exists
     */
    public function exists(string $view): bool
    {
        $viewFile = $this->getViewFile($view);
        return file_exists($viewFile);
    }

    /**
     * Get view path
     */
    public function getViewPath(): string
    {
        return $this->viewPath;
    }

    /**
     * Set view path
     */
    public function setViewPath(string $path): void
    {
        $this->viewPath = $path;
    }
}