<?php
/**
 * Blog Controller
 */

class BlogController {
    private $view;
    private $db;

    public function __construct() {
        $this->view = new View();
        $this->db = Database::getInstance();
    }

    public function index() {
        $page = isset($_GET['page']) ? (int)$_GET['page'] : 1;
        $perPage = 6;
        $offset = ($page - 1) * $perPage;
        
        // Filtreleme
        $deviceType = $_GET['device_type'] ?? null;
        $brand = $_GET['brand'] ?? null;
        
        $where = "status = 'published'";
        $params = [];
        
        if ($deviceType) {
            $where .= " AND device_type = ?";
            $params[] = $deviceType;
        }
        
        if ($brand) {
            $where .= " AND brand = ?";
            $params[] = $brand;
        }
        
        $posts = $this->db->fetchAll(
            "SELECT * FROM posts WHERE $where ORDER BY created_at DESC LIMIT ? OFFSET ?",
            array_merge($params, [$perPage, $offset])
        );

        $total = $this->db->fetchOne("SELECT COUNT(*) as total FROM posts WHERE $where", $params);
        $totalPages = ceil($total['total'] / $perPage);
        
        // Kategoriler ve markalar
        $deviceTypes = $this->db->fetchAll(
            "SELECT DISTINCT device_type FROM posts WHERE status = 'published' AND device_type IS NOT NULL ORDER BY device_type"
        );
        
        $brands = $this->db->fetchAll(
            "SELECT DISTINCT brand FROM posts WHERE status = 'published' AND brand IS NOT NULL ORDER BY brand"
        );

        // SEO - Çözüm Merkezi Sayfası (Title: 60 karakter, Description: 160 karakter)
        $latestPosts = $this->getLatestPosts();

        $this->view->set('page_title', 'Çözüm Merkezi');
        $this->view->set('page_description', 'Ankara beyaz eşya kombi servisi çözüm merkezi. Buzdolabı, çamaşır makinesi, kombi, klima ve televizyon arıza çözümleri, bakım ipuçları ve teknik bilgiler. Uzman tavsiyeleri.');
        $this->view->set('page_keywords', 'ankara beyaz eşya servisi çözüm merkezi, kombi arıza çözümleri, beyaz eşya bakım ipuçları, teknik servis bilgileri');
        $this->view->set('posts', $posts);
        $this->view->set('current_page', $page);
        $this->view->set('total_pages', $totalPages);
        $this->view->set('device_types', $deviceTypes);
        $this->view->set('brands', $brands);
        $this->view->set('current_device_type', $deviceType);
        $this->view->set('current_brand', $brand);
        $this->view->set('latest_posts', $latestPosts);

        $this->view->render('blog/index');
    }

    public function show($slug) {
        $post = $this->findPostBySlug($slug);

        if (!$post) {
            $this->renderNotFound();
            return;
        }

        $latestPosts = $this->getLatestPosts($post['id']);
        $deviceTypes = $this->getDeviceTypes();
        $brands = $this->getBrands();

        $this->renderPost($post, $latestPosts, $deviceTypes, $brands);
    }
    
    public function showByCategory($deviceTypeSlug, $slug) {
        $post = $this->findPostBySlug($slug);

        if (!$post) {
            $this->renderNotFound();
            return;
        }

        $postDeviceSlug = Helper::slug($post['device_type'] ?? '');
        if (!$postDeviceSlug || $postDeviceSlug !== $deviceTypeSlug) {
            $this->renderNotFound();
            return;
        }

        $latestPosts = $this->getLatestPosts($post['id']);
        $deviceTypes = $this->getDeviceTypes();
        $brands = $this->getBrands();

        $this->renderPost($post, $latestPosts, $deviceTypes, $brands);
    }
    
    public function showByBrand($deviceTypeSlug, $brandSlug, $slug) {
        $post = $this->findPostBySlug($slug);

        if (!$post) {
            $this->renderNotFound();
            return;
        }

        $postDeviceSlug = Helper::slug($post['device_type'] ?? '');
        $postBrandSlug = Helper::slug($post['brand'] ?? '');

        if (!$postDeviceSlug || $postDeviceSlug !== $deviceTypeSlug || !$postBrandSlug || $postBrandSlug !== $brandSlug) {
            $this->renderNotFound();
            return;
        }

        $latestPosts = $this->getLatestPosts($post['id']);
        $deviceTypes = $this->getDeviceTypes();
        $brands = $this->getBrands();

        $this->renderPost($post, $latestPosts, $deviceTypes, $brands);
    }

    private function findPostBySlug($slug) {
        return $this->db->fetchOne(
            "SELECT * FROM posts WHERE slug = ? AND status = 'published'",
            [$slug]
        );
    }

    private function renderPost($post, $latestPosts = [], $deviceTypes = [], $brands = []) {
        // SEO - Çözüm Merkezi Detay Sayfası (Title: max 60 karakter, Description: 160 karakter)
        $postTitle = $post['title'];
        $postExcerpt = Helper::excerpt(strip_tags($post['content']), 120);
        
        $seoTitle = $postTitle . ' | Ankara Servis';
        if (mb_strlen($seoTitle) > 60) {
            $seoTitle = mb_substr($postTitle, 0, 40) . '... | Ankara Servis';
        }
        
        $seoDescription = $postExcerpt . ' - Ankara beyaz eşya kombi servisi Anka Servis çözüm merkezi.';
        if (mb_strlen($seoDescription) > 160) {
            $seoDescription = mb_substr($seoDescription, 0, 157) . '...';
        }
        
        $this->view->set('page_title', $seoTitle);
        $this->view->set('page_description', $seoDescription);
        $this->view->set('page_keywords', 'ankara beyaz eşya servisi, ankara kombi servisi, ' . strtolower($postTitle));
        $this->view->set('post', $post);
        $this->view->set('latest_posts', $latestPosts);
        $this->view->set('device_types', $deviceTypes);
        $this->view->set('brands', $brands);

        $this->view->render('blog/show');
    }

    private function renderNotFound() {
        http_response_code(404);
        $this->view->render('errors/404');
    }
    private function getLatestPosts($excludeId = null) {
        $sql = "SELECT id, title, slug, device_type, brand, created_at FROM posts WHERE status = 'published'";
        $params = [];

        if ($excludeId) {
            $sql .= " AND id != ?";
            $params[] = $excludeId;
        }

        $sql .= " ORDER BY created_at DESC LIMIT 6";

        return $this->db->fetchAll($sql, $params);
    }

    private function getDeviceTypes() {
        return $this->db->fetchAll(
            "SELECT DISTINCT device_type FROM posts WHERE status = 'published' AND device_type IS NOT NULL ORDER BY device_type"
        );
    }

    private function getBrands() {
        return $this->db->fetchAll(
            "SELECT DISTINCT brand FROM posts WHERE status = 'published' AND brand IS NOT NULL ORDER BY brand"
        );
    }
}