<?php

use Spatie\YamlFrontMatter\YamlFrontMatter;

class MySQLAdapter {
	public $raw;

	function __construct() {
		$this->raw = mysqli_connect('mysql', 'root', 'example', 'dragon_fire');

		if (!$this->raw)
		{
		echo 'Connection failed<br>';
		echo 'Error number: ' . mysqli_connect_errno() . '<br>';
		echo 'Error message: ' . mysqli_connect_error() . '<br>';
		die();
		}
	}

	function _exec($qery, $argtypes, ...$args) {
		$stmt = $this->raw->prepare($qery);
		$stmt->bind_param($argtypes, ...$args);
		$stmt->execute();

		return $stmt->get_result();
	}

	function _prepare_post_data($post_data) {
    	if($post_data == null) {
       		$post_data = [
        		"found" => false
        	];
    	}
    	else {
	  		$post_data["found"] = true;
   		$post_data["post_metadata"] = json_decode($post_data["post_metadata"]);
    	}
    	
    	return $post_data;
	}

	function save_markdown_post($post_path, $post_data) {
		$frontmatter_post = YamlFrontMatter::parse($post_data);

		$post_path = chop($post_path, '/');
		$path_depth = substr_count($post_path, "/");

		$post_content = $frontmatter_post->body();
		$post_metadata = $frontmatter_post->matter();

		$post_metadata['type'] = 'text/markdown';

		var_dump($post_path, $post_content, $post_metadata);

		$qry = "
			INSERT INTO posts
				(post_path, post_path_depth, post_metadata, post_content)
			VALUES
				( ?, ?, ?, ?) AS new
			ON DUPLICATE KEY UPDATE post_metadata=new.post_metadata, post_content=new.post_content;";

		$this->_exec($qry, "siss", 
			$post_path,
			$path_depth,
			json_encode($post_metadata),
			$post_content);
	}

	function get_post_by_path($post_path, $with_subposts = true) {
		$qry = "SELECT * FROM posts WHERE post_path = ?";

		$post_path = chop($post_path, '/');

		$post_data = $this->_prepare_post_data($this->_exec($qry, "s", $post_path)->fetch_assoc());

		if($with_subposts) {
			$post_data['subposts'] = $this->get_subposts_by_path($post_path);
		}

		return $post_data;
	}

	function get_subposts_by_path($path) {
	    global $sql;
	
	    $path = chop($path, '/');
	
	    $path_depth = substr_count($path, "/");
	
	    $qry = "SELECT post_path, post_metadata
	        FROM posts 
	        WHERE (post_path LIKE CONCAT(?,'/%')) 
	            AND post_path_depth = ?
	            ORDER BY post_create_time DESC
	            LIMIT 10";

	   $post_data = $this->_exec($qry, "si", $path, $path_depth+1)->fetch_all(MYSQLI_ASSOC);

		$fn = function($data) {
			return $this->_prepare_post_data($data);
		};
		
	    $post_data = array_map($fn, $post_data);
	
	    return $post_data; 
	}
}

?>