const DEFAULT_MODULE_ID = "xyzbc-trt";
const DEFAULT_JOINT_COUNT = 5;
const SOURCE_MODE = "source-derived-kinematics-wasm";
const SEMANTIC_BOUNDARY = "linuxcnc_kinematics_wasm_c_abi";
const DEFAULT_SDK_MODULE_URL = "../../../../wasm-port/runtime/sdk/src/linuxcnc-kinematics.js";

export async function createLinuxCncKinematicsRuntime({
  moduleId = DEFAULT_MODULE_ID,
  moduleOptions = null,
  switchkinsType = 0,
  jointCount = DEFAULT_JOINT_COUNT,
  wasmRoot = null,
  sdkModuleUrl = DEFAULT_SDK_MODULE_URL,
} = {}) {
  const {
    createLinuxCncKinematicsSdk,
    linuxCncKinematicsWasmFile,
    supportedLinuxCncKinematicsModules,
  } = await import(sdkModuleUrl);
  const wasmFile = linuxCncKinematicsWasmFile(moduleId);
  if (!wasmFile) {
    throw new Error(`unsupported LinuxCNC kinematics module: ${moduleId}`);
  }

  const resolvedModuleOptions = moduleOptions || await createDefaultModuleOptions({ wasmRoot, wasmFile });
  const sdk = await createLinuxCncKinematicsSdk({ moduleId, moduleOptions: resolvedModuleOptions });
  let activeSwitchkinsType = switchkinsType;
  let activeSwitchRc = typeof sdk.switchKinematics === "function"
    ? sdk.switchKinematics(switchkinsType)
    : 0;

  return {
    apiName: "web-rtcp-5axis-linuxcnc-kinematics-runtime",
    moduleId,
    wasmFile,
    supportedModules: supportedLinuxCncKinematicsModules(),
    loaded: true,
    sourceMode: SOURCE_MODE,
    semanticBoundary: SEMANTIC_BOUNDARY,
    executionContext: "direct",
    get switchkinsType() {
      return activeSwitchkinsType;
    },
    get switchRc() {
      return activeSwitchRc;
    },
    jointCount,
    sdk,

    readiness() {
      return {
        apiName: "web-rtcp-5axis-linuxcnc-kinematics-runtime-readiness",
        moduleId,
        wasmFile,
        supportedModules: supportedLinuxCncKinematicsModules(),
        loaded: true,
        sourceMode: SOURCE_MODE,
        semanticBoundary: SEMANTIC_BOUNDARY,
        executionContext: "direct",
        switchkinsType: activeSwitchkinsType,
        switchRc: activeSwitchRc,
      };
    },

    switchKinematics(nextSwitchkinsType) {
      const requestedType = Number(nextSwitchkinsType) || 0;
      activeSwitchRc = typeof sdk.switchKinematics === "function"
        ? sdk.switchKinematics(requestedType)
        : 0;
      activeSwitchkinsType = requestedType;
      return activeSwitchRc;
    },

    forward(joints, options = {}) {
      return sdk.forward(joints, options);
    },

    inverse(pose, count = jointCount, options = {}) {
      return sdk.inverse(pose, count, options);
    },

    frameForJoints(joints, options = {}) {
      const jointValues = Array.from(joints, Number);
      const forward = sdk.forward(jointValues, options.forwardOptions || {});
      const inverse = sdk.inverse(
        forward.pose,
        options.jointCount || jointCount,
        { seedJoints: jointValues, ...(options.inverseOptions || {}) },
      );
      return {
        moduleId,
        switchkinsType: activeSwitchkinsType,
        forward,
        inverse,
      };
    },
  };
}

async function createDefaultModuleOptions({ wasmRoot, wasmFile }) {
  const quietOptions = {
    print() {},
    printErr() {},
  };
  if (!isNodeRuntime()) {
    return quietOptions;
  }

  const [{ readFileSync }, { dirname, resolve }, { fileURLToPath }] = await Promise.all([
    import("node:fs"),
    import("node:path"),
    import("node:url"),
  ]);
  const moduleDir = dirname(fileURLToPath(import.meta.url));
  const resolvedWasmRoot = wasmRoot || resolve(moduleDir, "../../../../wasm-port/build/wasm/kinematics");
  return {
    ...quietOptions,
    wasmBinary: readFileSync(resolve(resolvedWasmRoot, wasmFile)),
  };
}

function isNodeRuntime() {
  return typeof process === "object"
    && typeof process.versions === "object"
    && typeof process.versions.node === "string"
    && process.type !== "renderer";
}

export function createLinuxCncKinematicsRuntimeDescriptor(runtime) {
  if (!runtime?.loaded) return null;
  return {
    apiName: runtime.apiName,
    moduleId: runtime.moduleId,
    wasmFile: runtime.wasmFile,
    supportedModules: runtime.supportedModules,
    loaded: runtime.loaded,
    sourceMode: runtime.sourceMode,
    semanticBoundary: runtime.semanticBoundary,
    executionContext: runtime.executionContext || "direct",
    workerUrl: runtime.workerUrl || null,
    switchkinsType: runtime.switchkinsType,
    switchRc: runtime.switchRc,
  };
}