/*
 * SPEC: PJ2026-0104010803 Workbench唯一投影 draft-2026-06-18-p0-unique-projection; PJ2026-010403 API契约 draft-2026-06-18-r1.
 * 职责: WorkbenchReadModel 组件入口。只通过 WorkbenchFactsStore 读取 durable projection facts，不执行 AgentRun sync/finalize/repair。
 */
import { createWorkbenchFactsStore } from "./workbench-facts-store.ts";

export function createWorkbenchReadModel(options = {}, actor = null) {
  const facts = createWorkbenchFactsStore(options, actor);
  return {
    facts,
    listSessions: (input = {}) => facts.listSessions(input),
    getSessionById: (sessionId) => facts.getSessionById(sessionId),
    getSessionByRouteId: (routeId) => facts.getSessionByRouteId(routeId),
    getSessionByTraceId: (traceId) => facts.getSessionByTraceId(traceId),
    resultForTrace: (traceId) => facts.resultForTrace(traceId),
    traceSnapshot: (traceId) => facts.traceSnapshot(traceId),
    traceSnapshotSync: (traceId) => facts.traceSnapshotSync(traceId),
    subscribeTrace: (traceId, listener) => facts.subscribeTrace(traceId, listener),
    canReadOwner: (ownerUserId) => facts.canReadOwner(ownerUserId),
    projectionDiagnostics: ({ traceId, result = null, trace = null } = {}) => projectionDiagnostics({ traceId, result, trace })
  };
}

export function projectionDiagnostics({ traceId, result = null, trace = null } = {}) {
  const agentRun = result?.agentRun && typeof result.agentRun === "object" ? result.agentRun : null;
  const events = Array.isArray(trace?.events) ? trace.events : [];
  const lastEvent = trace?.lastEvent ?? events.at(-1) ?? null;
  const lastProjectedSeq = Number(lastEvent?.seq ?? trace?.lastProjectedSeq ?? 0);
  const hasTraceProjection = Boolean(trace && trace.status !== "missing" && (events.length > 0 || lastEvent));
  const sourceRunId = agentRun?.runId ?? lastEvent?.runId ?? null;
  const sourceCommandId = agentRun?.commandId ?? lastEvent?.commandId ?? null;
  const blocker = result?.blocker ?? result?.error ?? null;
  const status = blocker
    ? "blocked"
    : !hasTraceProjection && (result || agentRun)
      ? "projecting"
      : isTerminalStatus(result?.status ?? trace?.status)
      ? "caught-up"
      : result || trace?.status !== "missing"
        ? "projecting"
        : "unknown";
  return {
    projectionStatus: status,
    lastProjectedSeq: Number.isFinite(lastProjectedSeq) && lastProjectedSeq > 0 ? Math.trunc(lastProjectedSeq) : null,
    sourceRunId,
    sourceCommandId,
    blocker: blocker ? diagnosticBlocker(blocker) : null,
    updatedAt: trace?.updatedAt ?? result?.updatedAt ?? null,
    valuesRedacted: true
  };
}

function diagnosticBlocker(value = {}) {
  if (!value || typeof value !== "object") return { code: "projection_blocked", summary: String(value), valuesRedacted: true };
  return {
    code: String(value.code ?? value.errorCode ?? "projection_blocked"),
    summary: String(value.summary ?? value.userMessage ?? value.message ?? value.code ?? "Projection is blocked."),
    retryable: typeof value.retryable === "boolean" ? value.retryable : null,
    valuesRedacted: true
  };
}

function isTerminalStatus(value) {
  return ["completed", "failed", "blocked", "timeout", "cancelled", "canceled", "idle"].includes(String(value ?? "").trim().toLowerCase());
}