<?php // Get single post by ID

require_once("../_auth.php");
require_once("../_utils.php");
require_once("../_errorslist.php");
require_once("../_types.php");


// Functions

/*
 * FUNCTION
 * Increment number of views for post
 */
function Post_AddView (int $id): ReturnT {
	global $db;

	$s = $db->prepare("UPDATE posts SET views = views + 1 WHERE id = ?");
	$s->bind_param("s", $id);
	$s->execute();
	$d = $s->get_result()->fetch_assoc();

	if (!(bool)$d)
		return new ReturnT(err_code: E_UIN_WRONGID, err_desc: "failed to increment number of views");

	return new ReturnT(data: true);
}

/*
 * FUNCTION
 * Get post information by ID
 */
function Post_GetByID (int $id): ReturnT {
	global $db;

	$result = array();

	$s = $db->prepare("SELECT * FROM posts WHERE id = ?");
	$s->bind_param("s", $id);
	$s->execute();
	$d = $s->get_result()->fetch_assoc();

	if (!(bool)$d)
		return new ReturnT(err_code: E_UIN_WRONGID, err_desc: "failed to get post");

	$result["id"]                     = $d["id"];
	$result["author_id"]              = $d["author_id"];
	if ($d["comments_enabled"])
		$result["comment_section_id"] = $d["comment_section_id"];
	$result["created_at"]             = $d["created_at"];
	$result["tags"]                   = $d["tags"];
	$result["title"]                  = $d["title"];
	$result["votes_up"]               = $d["votes_up"];
	$result["votes_down"]             = $d["votes_down"];
	$result["views"]                  = $d["views"] + 1;
	$result["pic_path"]               = $d["pic_path"];
	$result["preview_path"]           = $d["preview_path"];
	$result["edit_lock"]              = $d["edit_lock"];

	$r = Post_AddView($id); // TODO: add rate-limit or completely rework
	if ($r.IsError())
		return $r;

	return new ReturnT(data: $result);
}


// Methods

/*
 * METHOD
 * Get post information by ID
 */
function Post_GetByID_Method (array $req) {
	// Input sanity checks

	$PostID = null;
	if (isset($req["id"])) {
		if (!ctype_digit($req["id"]))
			return new ReturnT(err_code: E_UIN_BADARGS, "id must be numeric");
		$PostID = intval($req["id"]);
	} else {
		return new ReturnT(err_code: E_UIN_INSUFARGS, "id must be specified");
	}

	// Actions

	return Post_GetByID($PostID);
}


if (Utils_ThisFileIsRequested(__FILE__)) {
	require_once("../_json.php");

	$result = Post_GetByID_Method($_REQUEST);

	if ($result->IsError())
		$result->ThrowJSONError();
	else
		JSON_ReturnData($result->GetData());
}

?>