<?php
namespace WooNooW\Frontend;

/**
 * Page SSR (Server-Side Rendering)
 * Renders page sections as static HTML for search engine crawlers
 */
class PageSSR
{
    /**
     * Render page structure to HTML
     * 
     * @param array $structure Page structure with sections
     * @param array|null $post_data Post data for dynamic placeholders
     * @return string Rendered HTML
     */
    public static function render($structure, $post_data = null)
    {
        if (empty($structure) || empty($structure['sections'])) {
            return '';
        }
        
        $html = '';
        
        foreach ($structure['sections'] as $section) {
            $html .= self::render_section($section, $post_data);
        }
        
        return $html;
    }
    
    /**
     * Render a single section to HTML
     * 
     * @param array $section Section data
     * @param array|null $post_data Post data for placeholders
     * @return string Section HTML
     */
    public static function render_section($section, $post_data = null)
    {
        $type = $section['type'] ?? 'content';
        $props = $section['props'] ?? [];
        $layout = $section['layoutVariant'] ?? 'default';
        $color_scheme = $section['colorScheme'] ?? 'default';
        
        // Resolve all props (replace dynamic placeholders with actual values)
        $resolved_props = self::resolve_props($props, $post_data);
        
        // Generate section ID for anchor links
        $section_id = $section['id'] ?? 'section-' . uniqid();
        
        $element_styles = $section['elementStyles'] ?? [];
        $styles = $section['styles'] ?? []; // Section wrapper styles (bg, overlay)

        // Render based on section type
        $method = 'render_' . str_replace('-', '_', $type);
        if (method_exists(__CLASS__, $method)) {
            return self::$method($resolved_props, $layout, $color_scheme, $section_id, $element_styles, $styles);
        }
        
        // Fallback: generic section wrapper
        return self::render_generic($resolved_props, $type, $section_id);
    }
    
    /**
     * Resolve props - replace dynamic placeholders with actual values
     * 
     * @param array $props Section props
     * @param array|null $post_data Post data
     * @return array Resolved props with actual values
     */
    public static function resolve_props($props, $post_data = null)
    {
        $resolved = [];
        
        foreach ($props as $key => $prop) {
            if (!is_array($prop)) {
                $resolved[$key] = $prop;
                continue;
            }
            
            $type = $prop['type'] ?? 'static';
            
            if ($type === 'static') {
                $resolved[$key] = $prop['value'] ?? '';
            } elseif ($type === 'dynamic' && $post_data) {
                $source = $prop['source'] ?? '';
                $resolved[$key] = PlaceholderRenderer::get_value($source, $post_data);
            } else {
                $resolved[$key] = $prop['value'] ?? '';
            }
        }
        
        return $resolved;
    }
    
    // ========================================
    // Section Renderers
    // ========================================
    
    /**
     * Helper to generate style attribute string
     */
    private static function generate_style_attr($styles) {
        if (empty($styles)) return '';
        
        $css = [];
        if (!empty($styles['color'])) $css[] = "color: {$styles['color']}";
        if (!empty($styles['backgroundColor'])) $css[] = "background-color: {$styles['backgroundColor']}";
        if (!empty($styles['fontSize'])) $css[] = "font-size: {$styles['fontSize']}"; // Note: assumes value has unit or is handled by class, but inline style works for specific values
        // Add more mapping if needed, or rely on frontend to send valid CSS values
        
        return empty($css) ? '' : 'style="' . implode(';', $css) . '"'; 
    }

    /**
     * Render Hero section
     */
    public static function render_hero($props, $layout, $color_scheme, $id, $element_styles = [], $section_styles = [])
    {
        $title = esc_html($props['title'] ?? '');
        $subtitle = esc_html($props['subtitle'] ?? '');
        $image = esc_url($props['image'] ?? '');
        $cta_text = esc_html($props['cta_text'] ?? '');
        $cta_url = esc_url($props['cta_url'] ?? '');
        
        // Section Styles (Background & Spacing)
        $bg_color = $section_styles['backgroundColor'] ?? '';
        $bg_image = $section_styles['backgroundImage'] ?? '';
        $overlay_opacity = $section_styles['backgroundOverlay'] ?? 0;
        $pt = $section_styles['paddingTop'] ?? '';
        $pb = $section_styles['paddingBottom'] ?? '';
        $height_preset = $section_styles['heightPreset'] ?? '';
        
        $section_css = "";
        if ($bg_color) $section_css .= "background-color: {$bg_color};";
        if ($bg_image) $section_css .= "background-image: url('{$bg_image}'); background-size: cover; background-position: center;";
        if ($pt) $section_css .= "padding-top: {$pt};";
        if ($pb) $section_css .= "padding-bottom: {$pb};";
        if ($height_preset === 'screen') $section_css .= "min-height: 100vh; display: flex; align-items: center;";
        
        $section_attr = $section_css ? "style=\"{$section_css}\"" : "";
        
        $html = "<section id=\"{$id}\" class=\"wn-section wn-hero wn-hero--{$layout} wn-scheme--{$color_scheme}\" {$section_attr}>";
        
        // Overlay
        if ($overlay_opacity > 0) {
            $opacity = $overlay_opacity / 100;
            $html .= "<div class=\"wn-hero__overlay\" style=\"background-color: rgba(0,0,0,{$opacity}); position: absolute; inset: 0;\"></div>";
        }

        // Element Styles
        $title_style = self::generate_style_attr($element_styles['title'] ?? []);
        $subtitle_style = self::generate_style_attr($element_styles['subtitle'] ?? []);
        $cta_style = self::generate_style_attr($element_styles['cta_text'] ?? []); // Button

        // Image (if not background)
        if ($image && !$bg_image && $layout !== 'default') {
             $html .= "<img src=\"{$image}\" alt=\"{$title}\" class=\"wn-hero__image\" />";
        }
        
        $html .= '<div class="wn-hero__content" style="position: relative; z-index: 10;">';
        if ($title) {
            $html .= "<h1 class=\"wn-hero__title\" {$title_style}>{$title}</h1>";
        }
        if ($subtitle) {
            $html .= "<p class=\"wn-hero__subtitle\" {$subtitle_style}>{$subtitle}</p>";
        }
        if ($cta_text && $cta_url) {
            $html .= "<a href=\"{$cta_url}\" class=\"wn-hero__cta\" {$cta_style}>{$cta_text}</a>";
        }
        $html .= '</div>';
        $html .= '</section>';
        
        return $html;
    }
    

    /**
     * Universal Row Renderer (Shared logic for Content & ImageText)
     */
    private static function render_universal_row($props, $layout, $color_scheme, $element_styles, $options = []) {
        $title = esc_html($props['title']['value'] ?? ($props['title'] ?? ''));
        $text = $props['text']['value'] ?? ($props['text'] ?? ($props['content']['value'] ?? ($props['content'] ?? ''))); // Handle both props/values
        $image = esc_url($props['image']['value'] ?? ($props['image'] ?? ''));
        
        // Options
        $has_image = !empty($image);
        $image_pos = $layout ?: 'left';
        
        // Element Styles
        $title_style = self::generate_style_attr($element_styles['title'] ?? []);
        $text_style = self::generate_style_attr($element_styles['text'] ?? ($element_styles['content'] ?? []));
        
        // Wrapper Classes
        $wrapper_class = "wn-max-w-7xl wn-mx-auto wn-px-4";
        $grid_class = "wn-mx-auto";
        
        if ($has_image && in_array($image_pos, ['left', 'right', 'image-left', 'image-right'])) {
            $grid_class .= " wn-grid wn-grid-cols-1 wn-lg-grid-cols-2 wn-gap-12 wn-items-center";
        } else {
            $grid_class .= " wn-max-w-4xl";
        }

        $html = "<div class=\"{$wrapper_class}\">";
        $html .= "<div class=\"{$grid_class}\">";
        
        // Image Output
        $image_html = "";
        if ($current_pos_right = ($image_pos === 'right' || $image_pos === 'image-right')) {
            $order_class = 'wn-lg-order-last';
        } else {
            $order_class = 'wn-lg-order-first';
        }

        if ($has_image) {
            $image_html = "<div class=\"wn-relative wn-w-full wn-aspect-[4/3] wn-rounded-2xl wn-overflow-hidden wn-shadow-lg {$order_class}\">";
            $image_html .= "<img src=\"{$image}\" alt=\"{$title}\" class=\"wn-absolute wn-inset-0 wn-w-full wn-h-full wn-object-cover\" />";
            $image_html .= "</div>";
        }
        
        // Content Output
        $content_html = "<div class=\"wn-flex wn-flex-col\">";
        if ($title) {
            $content_html .= "<h2 class=\"wn-text-3xl wn-font-bold wn-mb-6\" {$title_style}>{$title}</h2>";
        }
        if ($text) {
            // Apply prose classes similar to React
            $content_html .= "<div class=\"wn-prose wn-prose-lg wn-max-w-none\" {$text_style}>{$text}</div>";
        }
        $content_html .= "</div>";

        // Render based on order (Grid handles order via CSS classes for left/right, but fallback for DOM order)
        if ($has_image) {
             // For grid layout, we output both. CSS order handles visual.
             $html .= $image_html . $content_html;
        } else {
             $html .= $content_html;  
        }

        $html .= "</div></div>";
        
        return $html;
    }

    /**
     * Render Content section (for post body, rich text)
     */
    public static function render_content($props, $layout, $color_scheme, $id, $element_styles = [], $section_styles = [])
    {
        $content = $props['content'] ?? '';
        // Apply WordPress content filters (shortcodes, autop, etc.)
        $content = apply_filters('the_content', $content);
        // Normalize prop structure for universal renderer if needed
        if (is_string($props['content'])) {
             $props['content'] = ['value' => $content];
        } else {
             $props['content']['value'] = $content;
        }

        // Section Styles (Background)
        $bg_color = $section_styles['backgroundColor'] ?? '';
        $padding = $section_styles['paddingTop'] ?? '';
        $height_preset = $section_styles['heightPreset'] ?? '';

        $css = "";
        if($bg_color) $css .= "background-color:{$bg_color};";
        
        // Height Logic
        if ($height_preset === 'screen') {
             $css .= "min-height: 100vh; display: flex; align-items: center;";
             $padding = '5rem'; // Default padding for screen to avoid edge collision
        } elseif ($height_preset === 'small') {
             $padding = '2rem';
        } elseif ($height_preset === 'large') {
             $padding = '8rem'; 
        } elseif ($height_preset === 'medium') {
             $padding = '4rem';
        }
        
        if($padding) $css .= "padding:{$padding} 0;";
        
        $style_attr = $css ? "style=\"{$css}\"" : "";
        
        $inner_html = self::render_universal_row($props, 'left', $color_scheme, $element_styles);
        
        return "<section id=\"{$id}\" class=\"wn-section wn-content wn-scheme--{$color_scheme}\" {$style_attr}>{$inner_html}</section>";
    }
    
    /**
     * Render Image + Text section
     */
    public static function render_image_text($props, $layout, $color_scheme, $id, $element_styles = [], $section_styles = [])
    {
        $bg_color = $section_styles['backgroundColor'] ?? '';
        $padding = $section_styles['paddingTop'] ?? '';
        $height_preset = $section_styles['heightPreset'] ?? '';

        $css = "";
        if($bg_color) $css .= "background-color:{$bg_color};";

        // Height Logic
        if ($height_preset === 'screen') {
             $css .= "min-height: 100vh; display: flex; align-items: center;";
             $padding = '5rem';
        } elseif ($height_preset === 'small') {
             $padding = '2rem';
        } elseif ($height_preset === 'large') {
             $padding = '8rem'; 
        } elseif ($height_preset === 'medium') {
             $padding = '4rem';
        }

        if($padding) $css .= "padding:{$padding} 0;";
        $style_attr = $css ? "style=\"{$css}\"" : "";

        $inner_html = self::render_universal_row($props, $layout, $color_scheme, $element_styles);

        return "<section id=\"{$id}\" class=\"wn-section wn-image-text wn-scheme--{$color_scheme}\" {$style_attr}>{$inner_html}</section>";
    }
    
    /**
     * Render Feature Grid section
     */
    public static function render_feature_grid($props, $layout, $color_scheme, $id, $element_styles = [])
    {
        $heading = esc_html($props['heading'] ?? '');
        $items = $props['items'] ?? [];
        
        $html = "<section id=\"{$id}\" class=\"wn-section wn-feature-grid wn-feature-grid--{$layout} wn-scheme--{$color_scheme}\">";
        
        if ($heading) {
            $html .= "<h2 class=\"wn-feature-grid__heading\">{$heading}</h2>";
        }
        
        // Feature Item Styles (Card)
        $item_style_attr = self::generate_style_attr($element_styles['feature_item'] ?? []); // BG, Border, Shadow handled by CSS classes mostly, but colors here
        $item_bg = $element_styles['feature_item']['backgroundColor'] ?? '';
        
        $html .= '<div class="wn-feature-grid__items">';
        foreach ($items as $item) {
            $item_title = esc_html($item['title'] ?? '');
            $item_desc = esc_html($item['description'] ?? '');
            $item_icon = esc_html($item['icon'] ?? '');
            
            // Allow overriding item specific style if needed, but for now global
            $html .= "<div class=\"wn-feature-grid__item\" {$item_style_attr}>";
            
            // Render Icon SVG
            if ($item_icon) {
                $icon_svg = self::get_icon_svg($item_icon);
                if ($icon_svg) {
                    $html .= "<div class=\"wn-feature-grid__icon\">{$icon_svg}</div>";
                }
            }
            
            if ($item_title) {
                // Feature title style
                $f_title_style = self::generate_style_attr($element_styles['feature_title'] ?? []);
                $html .= "<h3 class=\"wn-feature-grid__item-title\" {$f_title_style}>{$item_title}</h3>";
            }
            if ($item_desc) {
                // Feature description style
                $f_desc_style = self::generate_style_attr($element_styles['feature_description'] ?? []);
                $html .= "<p class=\"wn-feature-grid__item-desc\" {$f_desc_style}>{$item_desc}</p>";
            }
            $html .= '</div>';
        }
        $html .= '</div>';
        $html .= '</section>';
        
        return $html;
    }
    
    /**
     * Render CTA Banner section
     */
    public static function render_cta_banner($props, $layout, $color_scheme, $id, $element_styles = [])
    {
        $title = esc_html($props['title'] ?? '');
        $text = esc_html($props['text'] ?? '');
        $button_text = esc_html($props['button_text'] ?? '');
        $button_url = esc_url($props['button_url'] ?? '');
        
        $html = "<section id=\"{$id}\" class=\"wn-section wn-cta-banner wn-cta-banner--{$layout} wn-scheme--{$color_scheme}\">";
        $html .= '<div class="wn-cta-banner__content">';
        
        if ($title) {
            $html .= "<h2 class=\"wn-cta-banner__title\">{$title}</h2>";
        }
        if ($text) {
            $html .= "<p class=\"wn-cta-banner__text\">{$text}</p>";
        }
        if ($button_text && $button_url) {
            $html .= "<a href=\"{$button_url}\" class=\"wn-cta-banner__button\">{$button_text}</a>";
        }
        
        $html .= '</div>';
        $html .= '</section>';
        
        return $html;
    }
    
    /**
     * Render Contact Form section
     */
    public static function render_contact_form($props, $layout, $color_scheme, $id, $element_styles = [])
    {
        $title = esc_html($props['title'] ?? '');
        $webhook_url = esc_url($props['webhook_url'] ?? '');
        $redirect_url = esc_url($props['redirect_url'] ?? '');
        $fields = $props['fields'] ?? ['name', 'email', 'message'];
        
        // Extract styles
        $btn_bg = $element_styles['button']['backgroundColor'] ?? '';
        $btn_color = $element_styles['button']['color'] ?? '';
        $field_bg = $element_styles['fields']['backgroundColor'] ?? '';
        $field_color = $element_styles['fields']['color'] ?? '';
        
        $btn_style = "";
        if ($btn_bg) $btn_style .= "background-color: {$btn_bg};";
        if ($btn_color) $btn_style .= "color: {$btn_color};";
        $btn_attr = $btn_style ? "style=\"{$btn_style}\"" : "";

        $field_style = "";
        if ($field_bg) $field_style .= "background-color: {$field_bg};";
        if ($field_color) $field_style .= "color: {$field_color};";
        $field_attr = $field_style ? "style=\"{$field_style}\"" : "";

        $html = "<section id=\"{$id}\" class=\"wn-section wn-contact-form wn-scheme--{$color_scheme}\">";
        
        if ($title) {
            $html .= "<h2 class=\"wn-contact-form__title\">{$title}</h2>";
        }
        
        // Form is rendered but won't work for bots (they just see the structure)
        $html .= '<form class="wn-contact-form__form" method="post">';
        
        foreach ($fields as $field) {
            $field_label = ucfirst(str_replace('_', ' ', $field));
            $html .= '<div class="wn-contact-form__field">';
            $html .= "<label>{$field_label}</label>";
            if ($field === 'message') {
                $html .= "<textarea name=\"{$field}\" placeholder=\"{$field_label}\" {$field_attr}></textarea>";
            } else {
                $html .= "<input type=\"text\" name=\"{$field}\" placeholder=\"{$field_label}\" {$field_attr} />";
            }
            $html .= '</div>';
        }
        
        $html .= "<button type=\"submit\" {$btn_attr}>Submit</button>";
        $html .= '</form>';
        $html .= '</section>';
        
        return $html;
    }

    /**
     * Helper to get SVG for known icons
     */
    private static function get_icon_svg($name) {
        $icons = [
            'Star' => '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polygon points="12 2 15.09 8.26 22 9.27 17 14.14 18.18 21.02 12 17.77 5.82 21.02 7 14.14 2 9.27 8.91 8.26 12 2"/></svg>',
            'Zap' => '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polygon points="13 2 3 14 12 14 11 22 21 10 12 10 13 2"/></svg>',
            'Shield' => '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z"/></svg>',
            'Heart' => '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M20.84 4.61a5.5 5.5 0 0 0-7.78 0L12 5.67l-1.06-1.06a5.5 5.5 0 0 0-7.78 7.78l1.06 1.06L12 21.23l7.78-7.78 1.06-1.06a5.5 5.5 0 0 0 0-7.78z"/></svg>',
            'Award' => '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="8" r="7"/><polyline points="8.21 13.89 7 23 12 20 17 23 15.79 13.88"/></svg>',
            'Clock' => '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><polyline points="12 6 12 12 16 14"/></svg>',
            'Truck' => '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="1" y="3" width="15" height="13"/><polygon points="16 8 20 8 23 11 23 16 16 16 16 8"/><circle cx="5.5" cy="18.5" r="2.5"/><circle cx="18.5" cy="18.5" r="2.5"/></svg>',
            'User' => '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"/><circle cx="12" cy="7" r="4"/></svg>',
            'Settings' => '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="3"/><path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1 0 2.83 2 2 0 0 1-2.83 0l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-2 2 2 2 0 0 1-2-2v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83 0 2 2 0 0 1 0-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1-2-2 2 2 0 0 1 2-2h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 0-2.83 2 2 0 0 1 2.83 0l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 2-2 2 2 0 0 1 2 2v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 0 2 2 0 0 1 0 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 2 2 2 2 0 0 1-2 2h-.09a1.65 1.65 0 0 0-1.51 1z"/></svg>',
        ];

        return $icons[$name] ?? $icons['Star'];
    }
    
    /**
     * Generic section fallback
     */
    public static function render_generic($props, $type, $id)
    {
        $content = '';
        foreach ($props as $key => $value) {
            if (is_string($value)) {
                $content .= "<div class=\"wn-{$type}__{$key}\">" . wp_kses_post($value) . "</div>";
            }
        }
        
        return "<section id=\"{$id}\" class=\"wn-section wn-{$type}\">{$content}</section>";
    }
}