const DEFAULT_SDK_MODULE_URLS = [
  new URL("../../../../wasm-port/runtime/sdk/src/linuxcnc-task-hal.js", import.meta.url).href,
  new URL("../../wasm-port/runtime/sdk/src/linuxcnc-task-hal.js", import.meta.url).href,
];

const SEMANTIC_BOUNDARY = "linuxcnc_task_motion_hal_wasm_simulation_runtime";

export async function createLinuxCncTaskHalRuntime({
  sdkModuleUrl = null,
  moduleOptions = {},
} = {}) {
  const errors = [];
  const candidateUrls = sdkModuleUrl ? [sdkModuleUrl] : DEFAULT_SDK_MODULE_URLS;
  for (const url of candidateUrls) {
    try {
      const { createLinuxCncTaskHalSdk } = await import(url);
      const sdk = await createLinuxCncTaskHalSdk(moduleOptions);
      return wrapTaskHalSdk(sdk, {
        sdkModuleUrl: url,
        executionContext: "direct",
      });
    } catch (error) {
      errors.push(`${url}: ${error instanceof Error ? error.message : String(error)}`);
    }
  }
  throw new Error(`LinuxCNC task/HAL runtime unavailable: ${errors.join(" | ")}`);
}

export function wrapTaskHalSdk(sdk, {
  sdkModuleUrl = null,
  executionContext = "direct",
  workerUrl = null,
} = {}) {
  if (!sdk || typeof sdk.readiness !== "function") {
    throw new Error("wrapTaskHalSdk requires a task/HAL SDK");
  }

  return {
    apiName: "web-rtcp-5axis-linuxcnc-task-hal-runtime",
    semanticBoundary: SEMANTIC_BOUNDARY,
    executionContext,
    sdkModuleUrl,
    workerUrl,
    loaded: true,

    readiness() {
      const readiness = sdk.readiness();
      const taskRuntimeReady = readiness.taskRuntimeReady === true;
      const motionRuntimeReady = readiness.motionRuntimeReady === true;
      const halRuntimeReady = readiness.halRuntimeReady === true;
      return {
        apiName: "web-rtcp-5axis-linuxcnc-task-hal-runtime-readiness",
        loaded: true,
        semanticBoundary: SEMANTIC_BOUNDARY,
        sdkSemanticBoundary: readiness.semanticBoundary,
        executionContext,
        workerUrl,
        taskRuntimeReady,
        motionRuntimeReady,
        halRuntimeReady,
        halSyncReady: taskRuntimeReady && motionRuntimeReady && halRuntimeReady,
        nativeTaskReady: taskRuntimeReady,
        nativeHalSyncReady: taskRuntimeReady && motionRuntimeReady && halRuntimeReady,
        hardwareDrive: false,
        hostRealtimeKernel: false,
        externalUserMProcessReady: false,
      };
    },

    initSession(session = {}) {
      return sdk.initSession(session);
    },

    stageFiles(files = []) {
      let staged = 0;
      for (const file of files) {
        const path = file.wasmPath || file.path;
        if (!path) continue;
        const rc = sdk.stageFile(path, file.text || "");
        if (rc !== 0) {
          throw new Error(`lctask_stage_file failed for ${path} rc=${rc}`);
        }
        staged += 1;
      }
      return staged;
    },

    openProgram(path) {
      const rc = sdk.openProgram(path);
      if (rc !== 0) {
        throw new Error(`lctask_open_program failed for ${path} rc=${rc}`);
      }
      return rc;
    },

    loadProgramMotionPlan(plan = {}) {
      if (typeof sdk.loadProgramMotionPlan !== "function") {
        throw new Error("task/HAL SDK missing loadProgramMotionPlan; rebuild wasm-port/tools/build_task_hal_wasm.sh");
      }
      const rc = sdk.loadProgramMotionPlan(plan);
      if (rc !== 0) {
        throw new Error(`lctask_load_program_motion_plan_json failed rc=${rc}`);
      }
      return rc;
    },

    sendCommand(command) {
      const rc = sdk.sendCommand(command);
      if (rc !== 0) {
        throw new Error(`lctask_send_command_json failed for ${command?.type || "unknown"} rc=${rc}`);
      }
      return rc;
    },

    runCycles(options = {}) {
      const rc = sdk.runCycles(options);
      if (rc !== 0) {
        throw new Error(`lctask_run_cycles failed rc=${rc}`);
      }
      return rc;
    },

    readStatus() {
      return normalizeTaskHalStatus(sdk.readStatus());
    },

    readEvents() {
      return sdk.readEvents();
    },

    resetSession() {
      return sdk.resetSession();
    },
  };
}

export function buildTaskHalSessionFromMachineFiles({ profile, plan, save, selectedProgramRel = null } = {}) {
  const files = save?.files || [];
  const iniFile = files.find((file) => file.kind === "ini")
    || files.find((file) => file.sourceRel === profile?.iniPath)
    || null;
  const selectedFile = selectedProgramRel
    ? files.find((file) => file.sourceRel === selectedProgramRel)
    : null;
  const programFile = selectedFile
    || files.find((file) => file.wasmPath === plan?.wasmProgramPath)
    || files.find((file) => file.kind === "demo")
    || null;

  return {
    apiName: "web-rtcp-5axis-task-hal-session",
    semanticBoundary: "linuxcnc_machine_files_for_task_hal_wasm_runtime",
    profileId: profile?.id || plan?.profileId || save?.profileId || "unknown",
    iniPath: iniFile?.wasmPath || plan?.wasmIniPath || plan?.iniPath || profile?.iniPath || null,
    iniText: iniFile?.text || "",
    programPath: programFile?.wasmPath || plan?.wasmProgramPath || null,
    programSourceRel: programFile?.sourceRel || selectedProgramRel || null,
    halFiles: files.filter((file) => file.kind === "hal").map(sessionFileDescriptor),
    toolTableFiles: files.filter((file) => file.kind === "toolTable").map(sessionFileDescriptor),
    remapFiles: files.filter((file) => file.kind === "remap").map(sessionFileDescriptor),
    files: files.map(sessionFileDescriptor),
    fileCount: files.length,
  };
}

export function buildTaskHalProgramMotionPlan({
  programPath = null,
  motion = [],
  timing = null,
  linearUnits = "mm",
  programLines = [],
} = {}) {
  const segments = Array.isArray(timing?.segments) ? timing.segments : [];
  let planSegments = segments.map((segment, index) => {
    const event = motion[index] || {};
    const startAxes = normalizePlanAxes(segment.startAxes || motion[index - 1]?.axes || {});
    const endAxes = normalizePlanAxes(segment.endAxes || segment.axes || event.axes || startAxes);
    return {
      line: Number(segment.line ?? event.line ?? index + 1),
      type: segment.type || event.type || "STRAIGHT_FEED",
      motionClass: segment.motionClass || (event.type === "STRAIGHT_TRAVERSE" ? "rapid" : "feed"),
      feedMode: segment.feedMode || event.feedMode || "units-per-minute",
      startSeconds: Number(segment.startSeconds || 0),
      durationSeconds: Math.max(Number(segment.durationSeconds || 0), 0),
      elapsedSeconds: Number(segment.elapsedSeconds || 0),
      feedRate: Number(segment.feedRate || event.feedRate || 0),
      linearUnits: segment.linearUnits || event.linearUnits || linearUnits,
      velocityMmPerMin: Math.max(Number(segment.velocityMmPerMin || 0), 0),
      requestedVelocityMmPerMin: Math.max(Number(segment.requestedVelocityMmPerMin || segment.velocityMmPerMin || 0), 0),
      startAxes,
      endAxes,
    };
  }).filter((segment) => segment.durationSeconds > 0 || segment.line > 0);
  const lineSegments = buildSourceLineMotionSegments({
    programLines,
    seedSegments: planSegments,
    linearUnits,
  });
  if (shouldUseSourceLineSegments(planSegments, lineSegments)) {
    planSegments = lineSegments;
  }

  return {
    apiName: "web-rtcp-5axis-task-hal-program-motion-plan",
    semanticBoundary: "linuxcnc_canonical_motion_feed_timed_task_hal_plan",
    programPath,
    linearUnits,
    totalSeconds: Number(timing?.totalSeconds || 0),
    segmentCount: planSegments.length,
    segments: planSegments,
  };
}

export function normalizeTaskHalStatus(status = {}) {
  const motion = status.motionStatus?.motion || {};
  const axis = status.motionStatus?.axis || {};
  const halPins = status.halSnapshot?.pins || {};
  const motionProgramLine = Number(motion.programLine || 0);
  const halProgramLine = Number(halPins["motion.program-line"]?.value || 0);
  const motionQueueDepth = Number(
    status.motionStatus?.commandQueueDepth ??
    motion.commandQueueDepth ??
    status.motionStatus?.queueDepth ??
    motion.queueDepth ??
    0,
  );
  const activeLine = motionProgramLine > 0
    ? motionProgramLine
    : halProgramLine > 0
      ? halProgramLine
      : 1;
  return {
    ...status,
    semanticBoundary: SEMANTIC_BOUNDARY,
    summary: {
      taskRuntimeReady: status.taskRuntimeReady === true,
      motionRuntimeReady: status.motionStatus?.motionHalSyncReady === true || status.taskCommandsDriveMotionRuntime === true,
      halRuntimeReady: Boolean(status.halSnapshot?.halRuntimeReady ?? status.halSnapshot?.ready ?? true),
      halSyncReady: status.taskCommandsDriveMotionRuntime === true && Boolean(halPins["motion.program-line"]),
      taskHalComparisonReady: status.taskRuntimeReady === true && status.taskCommandsDriveMotionRuntime === true,
      switchkinsRemapHalSync: Boolean(halPins["motion.switchkins-type"]),
      nativeTaskReady: status.taskRuntimeReady === true,
      nativeHalSyncReady: status.taskCommandsDriveMotionRuntime === true && Boolean(halPins["motion.program-line"]),
      fullLinuxCncProgramExecutionReady: false,
      hardwareDrive: false,
      hostRealtimeKernel: false,
    },
    ui: {
      taskState: String(status.task?.state || "ESTOP").toLowerCase(),
      taskMode: String(status.task?.mode || "MANUAL").toLowerCase(),
      interpState: String(status.task?.interpState || "IDLE").toLowerCase(),
      interpResumeState: String(status.task?.interpResumeState || status.task?.interpState || "IDLE").toLowerCase(),
      execState: String(status.task?.execState || "DONE").toLowerCase(),
      taskPaused: status.task?.taskPaused === true,
      singleStepping: status.task?.singleStepping === true,
      taskCycle: Number(status.task?.taskCycle ?? status.taskCycle ?? 0),
      servoCycle: Number(status.motionStatus?.cycle ?? status.task?.servoCycle ?? 0),
      motionQueueDepth,
      motionPaused: motion.paused === true,
      motionStepping: motion.stepping === true,
      motionId: Number(motion.motionId || 0),
      idForStep: Number(motion.idForStep || 0),
      halChangedPinCount: Array.isArray(status.halSnapshot?.changedPins)
        ? status.halSnapshot.changedPins.length
        : Number(status.halSnapshot?.changedPinCount || 0),
      activeLine,
      motionProgramLine,
      halProgramLine,
      activeLineSource: motionProgramLine > 0 ? "motion-status" : halProgramLine > 0 ? "hal-pin" : "fallback",
      activeLineHalSynced: motionProgramLine > 0 && halProgramLine > 0
        ? motionProgramLine === halProgramLine
        : false,
      switchkinsType: Number(motion.switchkinsType ?? halPins["motion.switchkins-type"]?.value ?? 0),
      axisPose: {
        x: Number(axis.x ?? halPins["axis.0.pos-cmd"]?.value ?? 0),
        y: Number(axis.y ?? halPins["axis.1.pos-cmd"]?.value ?? 0),
        z: Number(axis.z ?? halPins["axis.2.pos-cmd"]?.value ?? 0),
        a: Number(axis.a ?? halPins["axis.3.pos-cmd"]?.value ?? 0),
        b: Number(axis.b ?? halPins["axis.4.pos-cmd"]?.value ?? 0),
        c: Number(axis.c ?? halPins["axis.5.pos-cmd"]?.value ?? 0),
      },
      axisPoseFrame: isJogMotion(motion) ? "task-local" : "work",
      currentVelocity: Number(motion.currentVel || motion.currentVelocity || 0) * 60,
    },
  };
}

function shouldUseSourceLineSegments(planSegments, lineSegments) {
  if (lineSegments.length < 3) return false;
  const plannedLines = new Set(planSegments.map((segment) => Number(segment.line)).filter(Number.isFinite));
  const lineCount = lineSegments.length;
  return plannedLines.size <= 2 && lineCount > plannedLines.size;
}

function buildSourceLineMotionSegments({
  programLines = [],
  seedSegments = [],
  linearUnits = "mm",
} = {}) {
  if (!Array.isArray(programLines) || programLines.length === 0) return [];
  const seedByLine = new Map(seedSegments.map((segment) => [Number(segment.line), segment]));
  const axes = normalizePlanAxes(seedSegments[0]?.startAxes || {});
  const segments = [];
  let elapsedSeconds = 0;
  let feedRate = firstPositive(seedSegments.map((segment) => segment.feedRate), 100);
  let rapidVelocity = firstPositive(
    seedSegments.filter((segment) => segment.motionClass === "rapid").map((segment) => segment.velocityMmPerMin),
    2100,
  );

  for (let index = 0; index < programLines.length; index += 1) {
    const line = index + 1;
    const code = stripSourceLineComments(programLines[index]);
    if (!isExecutableGcodeLine(code)) continue;

    const seed = seedByLine.get(line) || null;
    const startAxes = normalizePlanAxes(seed?.startAxes || axes);
    const parsed = parseGcodeLineMotion(code, startAxes, feedRate);
    if (parsed.feedRate > 0) feedRate = parsed.feedRate;
    const motionClass = seed?.motionClass || parsed.motionClass;
    const endAxes = normalizePlanAxes(seed?.endAxes || parsed.endAxes);
    const velocityMmPerMin = Number(seed?.velocityMmPerMin) > 0
      ? Number(seed.velocityMmPerMin)
      : motionClass === "rapid"
        ? rapidVelocity
        : Math.max(feedRate, 1);
    if (motionClass === "rapid" && velocityMmPerMin > 0) {
      rapidVelocity = velocityMmPerMin;
    }
    const durationSeconds = Math.max(
      Number(seed?.durationSeconds || 0),
      estimateLineDurationSeconds(startAxes, endAxes, velocityMmPerMin),
      0.05,
    );
    const segment = {
      line,
      type: seed?.type || parsed.type,
      motionClass,
      feedMode: seed?.feedMode || parsed.feedMode,
      startSeconds: elapsedSeconds,
      durationSeconds,
      elapsedSeconds: elapsedSeconds + durationSeconds,
      feedRate,
      linearUnits: seed?.linearUnits || linearUnits,
      velocityMmPerMin,
      requestedVelocityMmPerMin: Number(seed?.requestedVelocityMmPerMin || velocityMmPerMin),
      startAxes,
      endAxes,
    };
    segments.push(segment);
    Object.assign(axes, endAxes);
    elapsedSeconds += durationSeconds;
  }
  return segments;
}

function parseGcodeLineMotion(code, startAxes, currentFeedRate) {
  const numberPattern = "[-+]?(?:\\d+(?:\\.\\d*)?|\\.\\d+)";
  const gCodes = [...code.matchAll(new RegExp(`\\bG\\s*(${numberPattern})\\b`, "gi"))].map((match) => Number(match[1]));
  const feedMode = gCodes.includes(93) ? "inverse-time" : "units-per-minute";
  const rapid = gCodes.includes(0);
  const feed = gCodes.some((value) => value === 1 || value === 2 || value === 3);
  const endAxes = { ...startAxes };
  for (const axis of ["x", "y", "z", "a", "b", "c", "u", "v", "w"]) {
    const match = code.match(new RegExp(`\\b${axis}\\s*(${numberPattern})`, "i"));
    if (match) endAxes[axis] = Number(match[1]);
  }
  const feedMatch = code.match(new RegExp(`\\bF\\s*(${numberPattern})`, "i"));
  const feedRate = feedMatch && Number(feedMatch[1]) > 0 ? Number(feedMatch[1]) : Number(currentFeedRate || 0);
  return {
    type: rapid ? "STRAIGHT_TRAVERSE" : "STRAIGHT_FEED",
    motionClass: rapid && !feed ? "rapid" : "feed",
    feedMode,
    feedRate,
    endAxes,
  };
}

function stripSourceLineComments(line) {
  return String(line || "")
    .replace(/\([^)]*\)/g, " ")
    .replace(/;.*$/g, " ")
    .trim();
}

function isExecutableGcodeLine(code) {
  if (!code || code === "%") return false;
  return /\b[GMTXYZABCUVWF]\s*[-+]?\d/i.test(code);
}

function estimateLineDurationSeconds(startAxes, endAxes, velocityMmPerMin) {
  const distance = Math.sqrt(["x", "y", "z"].reduce((total, axis) => {
    const delta = Number(endAxes[axis] || 0) - Number(startAxes[axis] || 0);
    return total + delta * delta;
  }, 0));
  if (distance <= 0 || velocityMmPerMin <= 0) return 0;
  return distance / Math.max(velocityMmPerMin / 60, 0.000001);
}

function firstPositive(values, fallback) {
  for (const value of values) {
    const number = Number(value);
    if (Number.isFinite(number) && number > 0) return number;
  }
  return fallback;
}

function normalizePlanAxes(axes = {}) {
  return Object.fromEntries(["x", "y", "z", "a", "b", "c", "u", "v", "w"].map((axis) => [
    axis,
    Number.isFinite(Number(axes[axis])) ? Number(axes[axis]) : 0,
  ]));
}

function isJogMotion(motion = {}) {
  return Number(motion.motionType) === 3 || Number(motion.teleopMode) === 1 || motion.teleopMode === true;
}

function sessionFileDescriptor(file) {
  return {
    sourceRel: file.sourceRel,
    wasmPath: file.wasmPath || file.path,
    path: file.wasmPath || file.path,
    kind: file.kind,
    bytes: Number(file.bytes || String(file.text || "").length),
    text: file.text || "",
  };
}