1 files changed, 114 insertions, 0 deletions

diff --git a/web/worker.mjs b/web/worker.mjs
new file mode 100644
index 0000000..dca980e
--- /dev/null
+++ b/web/worker.mjs
@@ -0,0 +1,114 @@
+import Nissy from "./nissy_web_module.mjs"
+
+const nissy = await Nissy();
+function log(message) {
+  postMessage({ command: "log", id: -1, object: message });
+  console.log(message);
+}
+nissy.setLogger(nissy._addCallbackFunction(log));
+
+const commands = [
+    { name: "solve", exec: solve },
+    { name: "download solver data", exec: downloadSolverData },
+];
+
+// Message structure:
+// {
+//   command: string // The function to run.
+//   id: number      // An identification number for the command, used for
+//                   // sending responses back to the caller and having them
+//                   // caught by the correct handler.
+//   arg: object     // The actual argument of the message, command-specific.
+//                   // See below for details.
+// }
+onmessage = (event) => {
+  for (var i = 0; i < commands.length; i++) {
+    if (commands[i].name == event.data.command) {
+      commands[i].exec(event.data.id, event.data.arg);
+      return;
+    }
+  }
+ 
+  log("[nissy worker] unknown command " + event.data.command);
+};
+
+// Download solver data.
+// Argument: string
+async function downloadSolverData(id, solver) {
+  const downloadSolverDataReturn = (success, message = "") => postMessage({
+    command: "download solver data",
+    id: id,
+    arg: {
+      success: success,
+      message: message
+    }
+  });
+
+  if (await nissy.initSolverDownload(arg.solver, "/tables")) {
+    downloadSolverDataReturn(true);
+  } else {
+    downloadSolverDataReturn(false, "Error retrieving the solver data");
+  }
+}
+
+// Solve the cube with the given options.
+// Argument: {
+//   solver: string
+//   scramble: string
+//   minmoves: number
+//   maxmoves: number
+//   maxsolutions: number
+//   optimal: number
+//   threads: number
+// }
+async function solve(id, arg) {
+  const solveReturn = (success, solutions = [], message = "") => postMessage({
+    command: "solve",
+    id: id,
+    arg: {
+      success: success,
+      solutions: solutions,
+      message: message
+    }
+  });
+
+  if (!(await nissy.isSolverAvailable(arg.solver))) {
+    solveReturn(false, [], "Error: solver " + arg.solver +
+      " is not available in this version of nissy.");
+    return;
+  }
+
+  if (!(await nissy.isSolverLoaded(arg.solver)) &&
+      !(await nissy.initSolverFromStorage(arg.solver))) {
+    solveReturn(false, [], "Error: solver " + arg.solver + " has not been " +
+      "loaded. Its data must be donwloaded or generated before using it.");
+    return;
+  }
+
+  var cube = new nissy.Cube();
+  cube.move(arg.scramble);
+
+  // TODO: error handling here?
+  const nissFlag = ((str) => {
+    switch (str) {
+      case "inverse": return nissy.NissFlag.inverse;
+      case "mixed": return nissy.NissFlag.mixed;
+      case "linear": return nissy.NissFlag.linear;
+      case "all": return nissy.NissFlag.all;
+      default: return nissy.NissFlag.normal;
+    }
+  })(arg.nissFlag);
+
+  const result = await nissy.solve(arg.solver, cube, nissFlag, arg.minmoves,
+    arg.maxmoves, arg.maxsolutions, arg.optimal, arg.threads, id);
+
+  if (result.err.ok()) {
+    //TODO: add solution lenght?
+    var solutions = result.solutions == "" ? [] : result.solutions.split("\n");
+    solutions.pop(); // Solver always returns string ending in newline
+    solveReturn(true, solutions);
+  } else {
+    solveReturn(false, [],
+      "Error while solving (error " + result.err.value + ")");
+  }
+};