From 76df4eb85cadf9cf548b4aa1cc95970e1d53f48d Mon Sep 17 00:00:00 2001
From: piernov <piernov@piernov.org>
Date: Sun, 1 May 2016 14:52:43 +0200
Subject: Implement loading saved games on server

---
 craftmine.php    |  2 ++
 inc/Item.inc     |  4 ++++
 inc/messages.inc |  1 +
 inc/savegame.inc | 30 ++++++++++++++++++++++++++++++
 4 files changed, 37 insertions(+)

diff --git a/craftmine.php b/craftmine.php
index ac187cc..28bb49d 100644
--- a/craftmine.php
+++ b/craftmine.php
@@ -49,6 +49,8 @@ switch($op) {
 	case "buyItem": buyItem(); break;
 	case "saveGame": saveGame(); break;
 	case "downSave": downSave(); break;
+	case "listSaves": listSaves(); break;
+	case "loadSave": loadSave(); break;
 	default: reportBadRequest();
 }
 
diff --git a/inc/Item.inc b/inc/Item.inc
index bef6d00..8e90998 100644
--- a/inc/Item.inc
+++ b/inc/Item.inc
@@ -20,6 +20,10 @@ class Item {
 		$item->addChild("icon", $this->icon);
 		$item->addChild("desc", $this->desc);
 	}
+
+	public static function fromXML($xml) {
+		return new static((string)$xml->name, +(string)$xml->cost /* convert to number */, (string)$xml->icon, (string)$xml->desc);
+	}
 }
 
 ?>
diff --git a/inc/messages.inc b/inc/messages.inc
index 9f3a09d..955c0a0 100644
--- a/inc/messages.inc
+++ b/inc/messages.inc
@@ -9,6 +9,7 @@ $messages = array(
 
 	"gamesave_ok" => "Game saved.",
 	"gamesave_error" => "An error occured when trying to save the game.",
+	"gamesave_not_found" => "Couldn't find the specified save file.",
 );
 
 function sendMessage($type, $msg) {
diff --git a/inc/savegame.inc b/inc/savegame.inc
index f3b6da6..4646601 100644
--- a/inc/savegame.inc
+++ b/inc/savegame.inc
@@ -41,4 +41,34 @@ function downSave() {
 	echo $save->asXML();
 }
 
+function listSaves() {
+	chdir(SAVEDIR); // Go to SAVEDIR folder, avoiding leading folder name in file list
+	echo json_encode(glob("*.save.xml"));
+}
+
+function parseSave($xml, &$table) { // Passing $table by reference
+	foreach($xml as $k => $v) {
+		if($v->count() == 0) { // No child, treat as string
+			$v = (string)$v;
+			if(is_numeric($v)) $v = +$v; // If it is in fact a number, treat it that way using PHP unary '+' coercion
+			$table[$k] = $v;
+		} elseif($k == "inventory") { // Special case for inventory: objects need to be created
+			foreach($v as $item) Inventory::addItem(Item::fromXML($item));
+		} else { // If nested array
+			$table[$k] = array();
+			parseXML($v, $table[$k]);
+		} // Other types unsupported (unused)
+	}
+}
+
+function loadSave() {
+	if(empty($_POST["filename"])) return;
+	$xml = simplexml_load_file(SAVEDIR . "/" . $_POST["filename"]);
+	if(empty($xml)) {
+		sendError("gamesave_not_found");
+		return;
+	}
+	$_SESSION = array(); // drop current game
+	parseSave($xml, $_SESSION);
+}
 ?>
-- 
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