// SPEC: PJ2026-0104010803 Workbench唯一投影 draft-2026-06-19-p1-agentrun-incremental-cursor; PJ2026-01060505 Workbench Performance draft-2026-06-17-p0.
// Responsibility: AgentRun projection polling/backoff I/O, durable polling state, and projection_sync observability attributes.

import { agentRunJson } from "./code-agent-agentrun-runtime.ts";
import { emitCodeAgentOtelSpan } from "./otel-trace.ts";
import { parsePositiveInteger, safeTraceId, text } from "./server-http-utils.ts";

const DEFAULT_AGENTRUN_PROJECTION_SYNC_BACKOFF_INITIAL_MS = 1_000;
const DEFAULT_AGENTRUN_PROJECTION_SYNC_BACKOFF_MAX_MS = 30_000;
const AGENTRUN_TERMINAL_STATUSES = new Set(["completed", "failed", "blocked", "cancelled", "canceled", "timeout"]);

export function agentRunProjectionPollCount(projectionState = null) {
  return nonNegativeNumber(projectionState?.pollCount) + 1;
}

export function agentRunProjectionPollingState({ projectionState = null, env = process.env, pollCount = null, cursorAdvance = 0, terminalFromEvents = null, error = null, rootCause = null, terminalConsistencyGap = 0 } = {}) {
  const retryable = agentRunPollingRetryableError(error);
  const noProgress = !error && !terminalFromEvents && Number(cursorAdvance ?? 0) <= 0;
  const previousNoProgress = nonNegativeNumber(projectionState?.noProgressPollCount);
  const noProgressPollCount = retryable || noProgress ? previousNoProgress + 1 : 0;
  const backoffReason = retryable ? "provider_retry_or_rate_limit" : noProgress ? "projection_no_progress" : null;
  const backoffMs = backoffReason ? agentRunProjectionBackoffMs(noProgressPollCount, env) : 0;
  return {
    pollCount: Number.isInteger(Number(pollCount)) && Number(pollCount) > 0 ? Math.floor(Number(pollCount)) : agentRunProjectionPollCount(projectionState),
    noProgressPollCount,
    backoffMs,
    backoffReason,
    rootCause: boundedAgentRunRootCause(rootCause ?? agentRunPollingRootCause(error) ?? backoffReason ?? "projection_sync"),
    terminalConsistencyGap: nonNegativeNumber(terminalConsistencyGap),
    nextRetryAt: backoffMs > 0 ? new Date(Date.now() + backoffMs).toISOString() : null,
    valuesPrinted: false
  };
}

export function agentRunPollingRetryableError(error = null) {
  const statusCode = Number(error?.statusCode ?? error?.agentRunError?.statusCode ?? 0);
  if ([408, 425, 429, 500, 502, 503, 504].includes(statusCode)) return true;
  const code = String(error?.code ?? error?.agentRunError?.failureKind ?? "").toLowerCase();
  return error?.retryable === true || code === "agentrun_timeout" || /rate.?limit|retry|timeout|temporar|unavailable|overload/u.test(code);
}

export function agentRunPollingRootCause(error = null) {
  if (!error) return null;
  const statusCode = Number(error?.statusCode ?? error?.agentRunError?.statusCode ?? 0);
  if (statusCode === 429) return "provider_rate_limited";
  if ([408, 425, 500, 502, 503, 504].includes(statusCode)) return `provider_retry_http_${statusCode}`;
  return error?.code ?? error?.agentRunError?.failureKind ?? error?.name ?? "agentrun_sync_failed";
}

export function agentRunErrorWithPolling(error, polling = null) {
  if (!error || !polling) return error;
  error.polling = polling;
  error.backoffMs = polling.backoffMs;
  error.nextRetryAt = polling.nextRetryAt;
  error.rootCause = polling.rootCause;
  return error;
}

export function agentRunTerminalConsistencyGap({ mapped = {}, eventsResponse = null, result = null } = {}) {
  const agentRun = mapped?.agentRun && typeof mapped.agentRun === "object" ? mapped.agentRun : {};
  const terminal = agentRunPollingTerminalStatus(result?.terminalStatus ?? result?.commandState ?? result?.status ?? mapped?.status ?? agentRun.terminalStatus ?? agentRun.commandState) || Boolean(agentRunTerminalStatusFromEvents(eventsResponse?.events));
  if (!terminal) return 0;
  const latest = Math.max(
    nonNegativeNumber(eventsResponse?.maxSeq),
    nonNegativeNumber(result?.eventCount),
    nonNegativeNumber(result?.lastSeq),
    nonNegativeNumber(agentRun.lastSeq)
  );
  const observed = Math.max(
    nonNegativeNumber(eventsResponse?.traceLastSeq),
    nonNegativeNumber(result?.lastSeq),
    nonNegativeNumber(agentRun.lastSeq)
  );
  return Math.max(0, latest - observed);
}

export function agentRunTerminalResultRefreshSatisfied(mapped = {}, traceId = null) {
  const safeId = safeTraceId(traceId ?? mapped?.traceId);
  const agentRun = mapped?.agentRun && typeof mapped.agentRun === "object" ? mapped.agentRun : null;
  const traceSummary = mapped?.traceSummary && typeof mapped.traceSummary === "object" ? mapped.traceSummary : null;
  const finalResponse = mapped?.finalResponse && typeof mapped.finalResponse === "object" ? mapped.finalResponse : null;
  const providerTrace = agentRun?.providerTrace && typeof agentRun.providerTrace === "object"
    ? agentRun.providerTrace
    : mapped?.providerTrace && typeof mapped.providerTrace === "object"
      ? mapped.providerTrace
      : null;
  const commandId = text(agentRun?.commandId);
  const runId = text(agentRun?.runId);
  if (!safeId || !runId || !commandId) return false;
  if (!agentRunPollingTerminalStatus(mapped?.status ?? agentRun?.terminalStatus ?? agentRun?.commandState ?? agentRun?.status)) return false;
  if (safeTraceId(mapped?.traceId ?? agentRun?.traceId) !== safeId) return false;
  if (safeTraceId(providerTrace?.traceId) !== safeId) return false;
  const finalTraceId = safeTraceId(finalResponse?.traceId ?? safeId);
  if (finalTraceId && finalTraceId !== safeId) return false;
  if (!String(finalResponse?.text ?? "").trim()) return false;
  if (traceSummary?.source !== "agentrun-command-result") return false;
  if (safeTraceId(traceSummary.traceId ?? safeId) !== safeId) return false;
  const summaryAgentRun = traceSummary.agentRun && typeof traceSummary.agentRun === "object" ? traceSummary.agentRun : null;
  if (text(summaryAgentRun?.runId) !== runId) return false;
  if (text(summaryAgentRun?.commandId) !== commandId) return false;
  return true;
}

export function emitAgentRunProjectionPollingSpan({ traceId, env = process.env, agentRun = {}, polling = {}, terminalRefreshSkipped = false } = {}) {
  void emitCodeAgentOtelSpan("projection_sync", traceId, env, {
    attributes: {
      runId: agentRun?.runId ?? null,
      commandId: agentRun?.commandId ?? null,
      terminalRefreshSkipped: terminalRefreshSkipped === true,
      pollCount: nonNegativeNumber(polling.pollCount),
      backoffMs: nonNegativeNumber(polling.backoffMs),
      rootCause: boundedAgentRunRootCause(polling.rootCause),
      terminalConsistencyGap: nonNegativeNumber(polling.terminalConsistencyGap)
    }
  });
}

export async function fetchAgentRunEventsForTrace({ fetchImpl, managerUrl, timeoutMs, env, mapping = {} }) {
  const runId = requiredString(mapping.runId, "runId");
  const currentCommandId = typeof mapping.commandId === "string" ? mapping.commandId : "";
  const replayWindow = agentRunTraceReplayWindow(mapping);
  const afterSeqOverride = Number(mapping.afterSeqOverride);
  const afterSeq = Number.isFinite(afterSeqOverride) && afterSeqOverride >= 0 ? Math.floor(afterSeqOverride) : replayWindow.afterSeq;
  const endSeq = Number.isFinite(afterSeqOverride) && afterSeqOverride >= 0 ? 0 : replayWindow.endSeq;
  const limit = parsePositiveInteger(mapping.eventsPageLimit ?? env?.HWLAB_CODE_AGENT_AGENTRUN_EVENTS_PAGE_LIMIT, 500);
  const path = `/api/v1/runs/${encodeURIComponent(runId)}/events?afterSeq=${encodeURIComponent(String(afterSeq))}&limit=${encodeURIComponent(String(limit))}`;
  const response = await agentRunJson(fetchImpl, managerUrl, path, { method: "GET", timeoutMs, env });
  const rawEvents = Array.isArray(response?.items) ? response.items : [];
  const events = rawEvents.filter((event) => agentRunEventBelongsToTrace(event, { currentCommandId, afterSeq, endSeq }));
  const maxSeq = Math.max(afterSeq, ...rawEvents.map((event) => Number(event?.seq ?? 0)).filter(Number.isFinite));
  const traceLastSeq = Math.max(afterSeq, ...events.map((event) => Number(event?.seq ?? 0)).filter(Number.isFinite));
  void emitCodeAgentOtelSpan("projection_sync", mapping.traceId ?? mapping.hwlabTraceId ?? mapping.businessTraceId, env, {
    attributes: {
      runId,
      commandId: currentCommandId || null,
      afterSeq,
      endSeq,
      limit,
      rawEventCount: rawEvents.length,
      eventCount: events.length,
      commandFiltered: Boolean(currentCommandId),
      maxSeq,
      traceLastSeq,
      terminalFromRawEvents: agentRunTerminalStatusFromEvents(rawEvents),
      terminalFromEvents: agentRunTerminalStatusFromEvents(events),
      pollCount: nonNegativeNumber(mapping.pollCount),
      backoffMs: nonNegativeNumber(mapping.backoffMs),
      rootCause: boundedAgentRunRootCause(mapping.rootCause),
      terminalConsistencyGap: nonNegativeNumber(mapping.terminalConsistencyGap)
    }
  });
  return {
    events,
    afterSeq,
    endSeq,
    rawEventCount: rawEvents.length,
    commandFiltered: Boolean(currentCommandId),
    maxSeq,
    traceLastSeq
  };
}

export async function measuredAgentRunEventsFetch({ performanceStore, fetchImpl, managerUrl, timeoutMs, env, mapping = {} }) {
  const startedAt = nowMs();
  try {
    const response = await fetchAgentRunEventsForTrace({ fetchImpl, managerUrl, timeoutMs, env, mapping });
    performanceStore?.recordWorkbenchProjectorBatch?.({ phase: "agentrun_events_fetch", status: "ok", durationMs: nowMs() - startedAt });
    return response;
  } catch (error) {
    performanceStore?.recordWorkbenchProjectorBatch?.({ phase: "agentrun_events_fetch", status: agentRunMetricStatusForError(error), durationMs: nowMs() - startedAt });
    performanceStore?.recordWorkbenchProjectorError?.({ reason: error?.code ?? "agentrun_events_fetch_failed" });
    throw error;
  }
}

export async function measuredAgentRunResultFetch({ performanceStore, fetchImpl, managerUrl, timeoutMs, env, mapped = {}, eventsResponse = null }) {
  const startedAt = nowMs();
  const path = `/api/v1/runs/${encodeURIComponent(mapped.agentRun.runId)}/commands/${encodeURIComponent(mapped.agentRun.commandId)}/result`;
  try {
    const result = await agentRunJson(fetchImpl, managerUrl, path, { method: "GET", timeoutMs, env });
    const eventCount = agentRunResultEventCount(result, eventsResponse);
    performanceStore?.recordAgentRunResult?.({
      durationMs: nowMs() - startedAt,
      eventCount,
      eventsScanned: eventCount,
      pagesScanned: estimateAgentRunResultPages(eventCount),
      status: result?.terminalStatus ?? result?.status ?? "ok",
      budget: timeoutMs
    });
    return result;
  } catch (error) {
    const status = agentRunMetricStatusForError(error);
    const eventCount = agentRunResultEventCount(null, eventsResponse);
    performanceStore?.recordAgentRunResult?.({
      durationMs: nowMs() - startedAt,
      eventCount,
      eventsScanned: eventCount,
      pagesScanned: estimateAgentRunResultPages(eventCount),
      status,
      budget: timeoutMs,
      timedOut: status === "timeout"
    });
    performanceStore?.recordWorkbenchProjectorError?.({ reason: error?.code ?? "agentrun_result_failed" });
    throw error;
  }
}

export function recordAgentRunEventsProjectionMetrics(performanceStore, eventsResponse = null, previousLastSeq = 0, nextLastSeq = 0) {
  if (!performanceStore || !eventsResponse) return;
  const cursorAdvance = Math.max(0, Number(nextLastSeq ?? 0) - Number(previousLastSeq ?? 0));
  if (cursorAdvance > 0) {
    performanceStore.recordWorkbenchProjectionCursorAdvance?.({
      status: "advanced",
      reason: eventsResponse.commandFiltered ? "command_filtered_events" : "run_events",
      projectionStatus: "projecting",
      source: "agentrun_v01",
      count: cursorAdvance
    });
  }
  const counts = new Map();
  for (const event of eventsResponse.events ?? []) {
    const kind = String(event?.type ?? event?.payload?.phase ?? "unknown").trim() || "unknown";
    counts.set(kind, (counts.get(kind) ?? 0) + 1);
  }
  if (counts.size === 0 && Number(eventsResponse.rawEventCount ?? 0) > 0) counts.set("filtered", Number(eventsResponse.rawEventCount));
  for (const [eventKind, count] of counts.entries()) {
    performanceStore.recordWorkbenchProjectorEvents?.({ eventKind, status: "ok", count });
  }
}

export function agentRunMetricStatusForError(error) {
  return error?.code === "agentrun_timeout" || error?.name === "AbortError" || Number(error?.statusCode) === 504 ? "timeout" : "error";
}

export function agentRunTraceCursorSeq(eventsResponse = {}, previousLastSeq = 0) {
  const afterSeq = Number(eventsResponse.afterSeq ?? 0);
  const endSeq = Number(eventsResponse.endSeq ?? 0);
  const traceLastSeq = Number(eventsResponse.traceLastSeq ?? 0);
  if (Number.isFinite(traceLastSeq) && traceLastSeq > afterSeq) return Math.floor(traceLastSeq);
  if (Number.isFinite(endSeq) && endSeq > 0) return Math.floor(endSeq);
  if (eventsResponse.commandFiltered === true) return Math.max(Number(previousLastSeq ?? 0), afterSeq);
  return Math.max(Number(previousLastSeq ?? 0), Number(eventsResponse.maxSeq ?? 0));
}

export function agentRunTerminalStatusFromEvents(events = []) {
  if (!Array.isArray(events)) return null;
  for (const event of [...events].reverse()) {
    const payload = event?.payload && typeof event.payload === "object" ? event.payload : {};
    const phase = payload.phase ?? event?.phase;
    const candidates = [
      event?.type === "terminal_status" ? payload.terminalStatus ?? event?.terminalStatus ?? payload.status ?? event?.status : null,
      phase === "command-terminal" ? payload.terminalStatus ?? event?.terminalStatus ?? payload.status ?? event?.status : null,
      phase === "turn:completed" || phase === "turn/steer:completed" ? "completed" : null,
      event?.terminal === true ? payload.terminalStatus ?? event?.terminalStatus ?? payload.status ?? event?.status ?? "completed" : null,
      payload.terminal === true ? payload.terminalStatus ?? event?.terminalStatus ?? payload.status ?? event?.status ?? "completed" : null
    ];
    for (const value of candidates) {
      const status = normalizeAgentRunStatus(value);
      if (agentRunPollingTerminalStatus(status)) return status;
    }
  }
  return null;
}

export function agentRunEventCommandId(event) {
  const payload = event?.payload && typeof event.payload === "object" ? event.payload : {};
  if (typeof event?.commandId === "string") return event.commandId;
  return typeof payload.commandId === "string" ? payload.commandId : "";
}

export function nonNegativeNumber(value) {
  const number = Number(value ?? 0);
  return Number.isFinite(number) && number > 0 ? Math.floor(number) : 0;
}

function agentRunProjectionBackoffMs(attempt, env = process.env) {
  const initialMs = parsePositiveInteger(env?.HWLAB_CODE_AGENT_AGENTRUN_PROJECTION_SYNC_BACKOFF_INITIAL_MS, DEFAULT_AGENTRUN_PROJECTION_SYNC_BACKOFF_INITIAL_MS);
  const maxMs = parsePositiveInteger(env?.HWLAB_CODE_AGENT_AGENTRUN_PROJECTION_SYNC_BACKOFF_MAX_MS, DEFAULT_AGENTRUN_PROJECTION_SYNC_BACKOFF_MAX_MS);
  const exponent = Math.max(0, Math.min(10, nonNegativeNumber(attempt) - 1));
  return Math.min(maxMs, initialMs * 2 ** exponent);
}

function boundedAgentRunRootCause(value) {
  const raw = String(value ?? "").trim().replace(/[^a-z0-9_.:-]+/giu, "_").replace(/^_+|_+$/gu, "").toLowerCase();
  return raw ? raw.slice(0, 120) : null;
}

function agentRunResultEventCount(result = null, eventsResponse = null) {
  const candidates = [
    result?.traceSummary?.sourceEventCount,
    result?.traceSummary?.eventCount,
    result?.sourceEventCount,
    result?.eventCount,
    result?.providerTrace?.eventCount,
    eventsResponse?.maxSeq,
    eventsResponse?.rawEventCount,
    eventsResponse?.events?.length
  ];
  for (const value of candidates) {
    const count = Number(value);
    if (Number.isFinite(count) && count >= 0) return Math.floor(count);
  }
  return 0;
}

function estimateAgentRunResultPages(eventCount) {
  const count = Number(eventCount);
  if (!Number.isFinite(count) || count <= 0) return 0;
  return Math.max(1, Math.ceil(count / 500));
}

function agentRunTraceReplayWindow(mapping = {}) {
  const eventStartSeq = Number(mapping.eventStartSeq ?? mapping.commandStartSeq ?? mapping.startSeq ?? 0);
  const summary = mapping.traceSummary && typeof mapping.traceSummary === "object" ? mapping.traceSummary : null;
  const summaryAgentRun = summary?.agentRun && typeof summary.agentRun === "object" ? summary.agentRun : null;
  const summaryLastSeq = Number(summaryAgentRun?.lastSeq ?? summary?.lastSeq ?? 0);
  const currentLastSeq = Number(mapping.lastSeq ?? 0);
  const endSeq = Number.isFinite(summaryLastSeq) && summaryLastSeq > 0 ? Math.floor(summaryLastSeq) : 0;
  if (Number.isFinite(eventStartSeq) && eventStartSeq > 0) return { afterSeq: Math.max(0, Math.floor(eventStartSeq) - 1), endSeq };
  if (endSeq > 0) return { afterSeq: Math.max(0, endSeq - 500), endSeq };
  if (Number.isFinite(currentLastSeq) && currentLastSeq > 0) return { afterSeq: Math.floor(currentLastSeq), endSeq: 0 };
  return { afterSeq: 0, endSeq: 0 };
}

function agentRunEventBelongsToTrace(event, { currentCommandId = "", afterSeq = 0, endSeq = 0 } = {}) {
  const eventCommandId = agentRunEventCommandId(event);
  const seq = Number(event?.seq ?? 0);
  if (currentCommandId && eventCommandId && eventCommandId !== currentCommandId) return false;
  if (endSeq > 0 && Number.isFinite(seq)) return seq > afterSeq && seq <= endSeq;
  return true;
}

function agentRunPollingTerminalStatus(value) {
  return AGENTRUN_TERMINAL_STATUSES.has(normalizeAgentRunStatus(value));
}

function normalizeAgentRunStatus(value) {
  const status = String(value ?? "").trim().toLowerCase().replace(/_/gu, "-");
  return status === "cancelled" ? "canceled" : status;
}

function requiredString(value, fieldName) {
  if (typeof value === "string" && value.trim()) return value.trim();
  throw Object.assign(new Error(`AgentRun response missing ${fieldName}`), { code: "agentrun_response_invalid", statusCode: 502 });
}

function nowMs() {
  if (typeof performance !== "undefined" && typeof performance.now === "function") return performance.now();
  return Date.now();
}