1 files changed, 71 insertions, 0 deletions
diff --git a/src/worldgen/structure/index.js b/src/worldgen/structure/index.js
new file mode 100644
index 0000000..8f19547
--- /dev/null
+++ b/src/worldgen/structure/index.js
@@ -0,0 +1,71 @@
+const { JigsawStartHeight } = require('../../enum.js');
+
+
+const jigsawConversionFields = {
+  type: 'minecraft:jigsaw',
+  start_pool: null,
+	size: 1,
+	start_height: {
+    absolute: {
+      value: 0,
+    },
+	},
+	max_distance_from_center: 1,
+	use_expansion_hack: false,
+};
+
+const jigsawStartHeightUniform = {
+  type: 'minecraft:uniform',
+  min_inclusive: {
+    above_bottom: 0,
+  },
+  max_inclusive: {
+    below_top: 0,
+  },
+};
+
+const jigsawStartHeightBiasedToBottom = {
+  type: 'minecraft:biased_to_bottom',
+  min_inclusive: {
+    above_bottom: 0,
+  },
+  max_inclusive: {
+    below_top: 0,
+  },
+};
+
+const jigsawStartHeightVeryBiasedToBottom = {
+  type: 'minecraft:very_biased_to_bottom',
+  min_inclusive: {
+    above_bottom: 0,
+  },
+  max_inclusive: {
+    below_top: 0,
+  },
+};
+
+
+function jigsawConversion(structure, fields) {
+  fields = Object.assign({
+    ...jigsawConversionFields,
+  }, fields);
+
+  if (fields.start_height === JigsawStartHeight.UNIFORM) {
+    fields.start_height = jigsawStartHeightUniform;
+  }
+  else if (fields.start_height === JigsawStartHeight.BIASED_TO_BOTTOM) {
+    fields.start_height = jigsawStartHeightBiasedToBottom;
+  }
+  else if (fields.start_height === JigsawStartHeight.VERY_BIASED_TO_BOTTOM) {
+    fields.start_height = jigsawStartHeightVeryBiasedToBottom;
+  }
+
+  return Object.assign({}, structure, fields);
+}
+
+
+module.exports = {
+  jigsawConversionFields,
+  jigsawStartHeightUniform,
+  jigsawConversion,
+};