"Autogenerate" data files with data fallbacks and moved keys folder into jar resources (#927)

* Autogenerate keys and data files

* Update gacha html files

Accidentally pushed with old html files

* Keys no longer copied. No more manually retrieving listing files. Recursive directory creation

Removed unused code from old GC as well.

* Moved somethings and better errors

* Fixed resources from loading twice

* Data files fallback

src/main/java/emu/grasscutter/data/DataLoader.java

@@ -0,0 +1,101 @@
+package emu.grasscutter.data;
+
+import emu.grasscutter.Grasscutter;
+import emu.grasscutter.server.http.handlers.GachaHandler;
+import emu.grasscutter.tools.Tools;
+import emu.grasscutter.utils.FileUtils;
+import emu.grasscutter.utils.Utils;
+
+import java.io.*;
+import java.nio.file.Path;
+import java.util.List;
+
+import static emu.grasscutter.Configuration.DATA;
+
+public class DataLoader {
+
+    /**
+     * Load a data file by its name. If the file isn't found within the /data directory then it will fallback to the default within the jar resources
+     * @see #load(String, boolean)
+     * @param resourcePath The path to the data file to be loaded.
+     * @return InputStream of the data file.
+     * @throws FileNotFoundException
+     */
+    public static InputStream load(String resourcePath) throws FileNotFoundException {
+        return load(resourcePath, true);
+    }
+
+    /**
+     * Load a data file by its name.
+     * @param resourcePath The path to the data file to be loaded.
+     * @param useFallback If the file does not exist in the /data directory, should it use the default file in the jar?
+     * @return InputStream of the data file.
+     * @throws FileNotFoundException
+     */
+    public static InputStream load(String resourcePath, boolean useFallback) throws FileNotFoundException {
+        if(Utils.fileExists(DATA(resourcePath))) {
+            // Data is in the resource directory
+            return new FileInputStream(DATA(resourcePath));
+        } else {
+            if(useFallback) {
+                return FileUtils.readResourceAsStream("/defaults/data/" + resourcePath);
+            }
+        }
+
+        return null;
+    }
+
+    public static void CheckAllFiles() {
+
+        try {
+            List<Path> filenames = FileUtils.getPathsFromResource("/defaults/data/");
+
+            for (Path file : filenames) {
+                String relativePath = String.valueOf(file).split("/defaults/data/")[1];
+
+                CheckAndCopyData(relativePath);
+            }
+        } catch (Exception e) {
+            Grasscutter.getLogger().error("An error occurred while trying to check the data folder. \n" + e);
+        }
+
+        GenerateGachaMappings();
+    }
+
+    private static void CheckAndCopyData(String name) {
+        String filePath = Utils.toFilePath(DATA(name));
+
+        if (!Utils.fileExists(filePath)) {
+            // Check if file is in subdirectory
+            if (name.indexOf("/") != -1) {
+                String[] path = name.split("/");
+
+                String folder = "";
+                for(int i = 0; i < (path.length - 1); i++) {
+                    folder += path[i] + "/";
+
+                    // Make sure the current folder exists
+                    String folderToCreate = Utils.toFilePath(DATA(folder));
+                    if(!Utils.fileExists(folderToCreate)) {
+                        Grasscutter.getLogger().info("Creating data folder '" + folder + "'");
+                        Utils.createFolder(folderToCreate);
+                    }
+                }
+            }
+
+            Grasscutter.getLogger().info("Creating default '" + name + "' data");
+            FileUtils.copyResource("/defaults/data/" + name, filePath);
+        }
+    }
+
+    private static void GenerateGachaMappings() {
+        if (!Utils.fileExists(GachaHandler.gachaMappings)) {
+            try {
+                Grasscutter.getLogger().info("Creating default '" + GachaHandler.gachaMappings + "' data");
+                Tools.createGachaMapping(GachaHandler.gachaMappings);
+            } catch (Exception exception) {
+                Grasscutter.getLogger().warn("Failed to create gacha mappings. \n" + exception);
+            }
+        }
+    }
+}