feat : add lichess cloud eval

src/lib/lichess.ts

@@ -0,0 +1,51 @@
+import { LineEval, MoveEval } from "@/types/eval";
+import { sortLines } from "./engine/helpers/parseResults";
+import {
+  LichessError,
+  LichessEvalBody,
+  LichessResponse,
+} from "@/types/lichess";
+
+export const getLichessEval = async (
+  fen: string,
+  multiPv = 1
+): Promise<MoveEval> => {
+  try {
+    const res = await fetch(
+      `https://lichess.org/api/cloud-eval?fen=${fen}&multiPv=${multiPv}`
+    );
+
+    const data: LichessResponse<LichessEvalBody> = await res.json();
+
+    if ("error" in data) {
+      if (data.error === LichessError.NotFound) {
+        return {
+          bestMove: "",
+          lines: [],
+        };
+      }
+      throw new Error(data.error);
+    }
+
+    const lines: LineEval[] = data.pvs.map((pv, index) => ({
+      pv: pv.moves.split(" "),
+      cp: pv.cp,
+      mate: pv.mate,
+      depth: data.depth,
+      multiPv: index + 1,
+    }));
+
+    lines.sort(sortLines);
+
+    return {
+      bestMove: lines[0].pv[0],
+      lines: lines.slice(0, multiPv),
+    };
+  } catch (error) {
+    console.error(error);
+    return {
+      bestMove: "",
+      lines: [],
+    };
+  }
+};