import { createHash } from "node:crypto";
import { canonicalJson } from "../../packages/shared/src/portability-hash.js";
import { isValidNativePrpEnvelope } from "./native-event-envelope.js";
import type { StoryCheck, StoryRun } from "./everyday-observations.js";
import { pollUntil } from "./api.js";

type Row = Record<string, unknown>;
const record = (value: unknown): Row => value !== null && typeof value === "object" && !Array.isArray(value) ? value as Row : {};
const id = (value: unknown): value is string => typeof value === "string" && value.length > 0 && value.length <= 256 && !/[\u0000-\u001f\u007f]/u.test(value);
const digest = (value: unknown) => createHash("sha256").update(canonicalJson(value)).digest("hex");

export interface RemoteRestartEvent {
  seq: number; sourceSeq: number; sourceEventId: string; eventType: string;
  sourceKind: "runner" | "control_plane"; turnId: string | null;
  toolExecutionId: string | null; toolCompleted: boolean; sha256: string;
}
export interface RemoteRestartBoundary {
  identity: { runId: string; companyId: string; agentId: string; issueId: string;
    runnerInstanceId: string; nativeSessionId: string; processPid: number; processStartedAt: string };
  lease: { id: string; environmentId: string; executionWorkspaceId: string | null; providerLeaseSha256: string };
  events: RemoteRestartEvent[];
}
export interface RemoteRestartEvidence {
  before?: RemoteRestartBoundary;
  after?: RemoteRestartBoundary;
  final?: { run: StoryRun; events: RemoteRestartEvent[]; operations: Row[];
    scheduledRetry: unknown; recoveryActions: Row[] };
}

export async function waitForRemoteRestartBoundary(input: {
  deadlineAt: number;
  load: () => Promise<{ run: StoryRun | undefined; boundary?: RemoteRestartBoundary }>;
}): Promise<RemoteRestartBoundary> {
  const observed = await pollUntil({
    label: "active remote native turn with completed tool receipt",
    deadlineAt: input.deadlineAt,
    load: input.load,
    accept: state => state.run?.status === "running" && state.boundary !== undefined,
    reject: state => !state.run || state.run.status !== "running"
      ? "Remote restart boundary unexercised: original run ended before fault injection" : undefined,
  });
  return observed.boundary!;
}

export function projectRemoteRestartRun(run: StoryRun): StoryRun {
  return { id: run.id, companyId: run.companyId, agentId: run.agentId, nativeIssueId: run.nativeIssueId,
    status: run.status, runtimeMode: run.runtimeMode, runnerInstanceId: run.runnerInstanceId, nativeSessionId: run.nativeSessionId,
    nativePhase: run.nativePhase === "committed" ? "committed" : null,
    resultJson: { finalizationPhase: run.resultJson?.finalizationPhase === "committed" ? "committed" : null,
      workspaceFinalizeStatus: run.resultJson?.workspaceFinalizeStatus === "succeeded" ? "succeeded" : null,
      nextAttemptAt: run.resultJson?.nextAttemptAt == null ? null : "scheduled",
      failureCode: run.resultJson?.failureCode == null ? null : "present" } };
}

/** Keep only receipt identities and hashes; never retain provider text or tool arguments. */
export function projectRemoteRestartEvents(run: StoryRun, rows: readonly Row[]): RemoteRestartEvent[] {
  const seen = new Set<string>();
  const cursors = new Map<string, number>();
  let lastSeq = 0;
  return rows.filter(row => record(row.payload).prpEvent !== undefined).map(row => {
    const event = record(record(row.payload).prpEvent);
    const source = event.sourceInstanceId;
    const runnerSource = event.sourceKind === "runner" && source === run.runnerInstanceId;
    const controllerSource = event.sourceKind === "control_plane" && source === `${run.runnerInstanceId}:control`
      && ["run.result.accepted", "run.terminal"].includes(String(event.eventType));
    if (row.companyId !== run.companyId || row.runId !== run.id || !isValidNativePrpEnvelope(event, row.protocolSchemaVersion)
      || event.runId !== run.id || event.normalizedSessionId !== run.nativeSessionId || event.eventType !== row.eventType
      || (!runnerSource && !controllerSource) || !id(source) || !id(event.sourceEventId)
      || !Number.isSafeInteger(row.seq) || Number(row.seq) <= lastSeq || !Number.isSafeInteger(event.sourceSeq)
      || Number(event.sourceSeq) <= (cursors.get(source) ?? 0) || seen.has(event.sourceEventId)
      || event.sourceEventId !== `${source}:${run.id}:${event.sourceSeq}`) {
      throw new Error("Remote restart has foreign, duplicate or invalid native receipts");
    }
    seen.add(event.sourceEventId); cursors.set(source, Number(event.sourceSeq)); lastSeq = Number(row.seq);
    const payload = record(event.payload);
    return { seq: lastSeq, sourceSeq: Number(event.sourceSeq), sourceEventId: event.sourceEventId,
      eventType: String(event.eventType), sourceKind: event.sourceKind as RemoteRestartEvent["sourceKind"],
      turnId: id(event.turnId) ? event.turnId : null,
      toolExecutionId: id(payload.executionId) ? payload.executionId : null,
      toolCompleted: event.eventType === "tool.execution.completed" && payload.status === "completed",
      sha256: digest(event) };
  });
}

export function observeRemoteRestartBoundary(run: StoryRun, rows: readonly Row[], leases: readonly Row[], scope: {
  companyId: string; agentId: string; issueId: string; environmentId: string;
}): RemoteRestartBoundary {
  if (run.companyId !== scope.companyId || run.agentId !== scope.agentId || run.nativeIssueId !== scope.issueId
    || run.status !== "running" || run.runtimeMode !== "native" || !id(run.id) || !id(run.runnerInstanceId)
    || !id(run.nativeSessionId) || !Number.isSafeInteger(run.processPid) || Number(run.processPid) <= 0
    || !id(run.processStartedAt) || !Number.isFinite(Date.parse(run.processStartedAt))) {
    throw new Error("Remote restart boundary requires the original live native process");
  }
  const owned = leases.filter(lease => lease.companyId === scope.companyId && lease.environmentId === scope.environmentId
    && lease.issueId === scope.issueId && lease.heartbeatRunId === run.id && lease.provider === "daytona"
    && lease.status === "active" && lease.releasedAt == null && id(lease.id) && id(lease.providerLeaseId));
  if (owned.length !== 1) throw new Error("Remote restart boundary requires one exact active sandbox lease");
  const lease = owned[0]!;
  const events = projectRemoteRestartEvents(run, rows);
  const starts = events.filter(event => event.eventType === "turn.started" && event.sourceKind === "runner");
  const completed = events.filter(event => event.toolCompleted && event.sourceKind === "runner" && event.toolExecutionId);
  if (starts.length !== 1 || !id(starts[0]!.turnId) || completed.length === 0
    || completed.some(event => event.turnId !== starts[0]!.turnId)
    || events.some(event => ["turn.completed", "turn.failed", "turn.cancelled", "turn.interrupted", "run.terminal"].includes(event.eventType))) {
    throw new Error("Remote restart boundary has no completed tool in an active original provider turn");
  }
  return {
    identity: { runId: run.id, companyId: scope.companyId, agentId: scope.agentId, issueId: scope.issueId,
      runnerInstanceId: run.runnerInstanceId, nativeSessionId: run.nativeSessionId,
      processPid: Number(run.processPid), processStartedAt: run.processStartedAt },
    lease: { id: String(lease.id), environmentId: scope.environmentId,
      executionWorkspaceId: typeof lease.executionWorkspaceId === "string" ? lease.executionWorkspaceId : null,
      providerLeaseSha256: digest(lease.providerLeaseId) },
    events,
  };
}

function retainsPrefix(before: readonly RemoteRestartEvent[], after: readonly RemoteRestartEvent[]): boolean {
  return before.length > 0 && after.length >= before.length && before.every((event, index) => digest(event) === digest(after[index]));
}

export function gradeRemoteRestart(evidence: RemoteRestartEvidence | undefined): StoryCheck[] {
  const { before, after, final } = evidence ?? {};
  const check = (id: string, passed: boolean, detail: string) => ({ id, passed, detail });
  const sameIdentity = Boolean(before && after && digest(before.identity) === digest(after.identity)
    && digest(before.lease) === digest(after.lease) && retainsPrefix(before.events, after.events));
  const run = final?.run;
  const identity = before?.identity;
  const finalIdentity = Boolean(identity && run && run.id === identity.runId && run.companyId === identity.companyId
    && run.agentId === identity.agentId && run.nativeIssueId === identity.issueId && run.runtimeMode === "native"
    && run.runnerInstanceId === identity.runnerInstanceId && run.nativeSessionId === identity.nativeSessionId);
  const events = final?.events ?? [];
  const turnId = before?.events.find(event => event.eventType === "turn.started")?.turnId;
  const once = (kind: string, source: RemoteRestartEvent["sourceKind"]) => events.filter(event => event.eventType === kind && event.sourceKind === source).length === 1;
  const completedTools = events.filter(event => event.toolCompleted).map(event => event.toolExecutionId);
  const nativeCompletion = finalIdentity && Boolean(before && after && retainsPrefix(after.events, events))
    && once("turn.submitted", "runner") && once("turn.started", "runner") && once("turn.completed", "runner")
    && once("run.result.accepted", "control_plane") && once("run.terminal", "control_plane")
    && events.filter(event => event.eventType.startsWith("turn.")).every(event => event.turnId === turnId || (event.eventType === "turn.submitted" && event.turnId === null))
    && new Set(completedTools).size === completedTools.length;
  const operations = final?.operations ?? [];
  const saved = finalIdentity && run?.status === "succeeded" && run.nativePhase === "committed"
    && run.resultJson?.finalizationPhase === "committed" && run.resultJson.workspaceFinalizeStatus === "succeeded"
    && run.resultJson.nextAttemptAt == null && run.resultJson.failureCode == null
    && operations.some(operation => operation.companyId === identity?.companyId && operation.heartbeatRunId === identity?.runId
      && operation.issueId === identity?.issueId && operation.phase === "workspace_finalize" && operation.status === "succeeded"
      && operation.executionWorkspaceId === before?.lease.executionWorkspaceId)
    && !operations.some(operation => ["pending", "queued", "running"].includes(String(operation.status)))
    && final?.scheduledRetry == null && !final?.recoveryActions.some(action => ["active", "pending"].includes(String(action.status)));
  return [
    check("remote-restart-same-process-and-lease", sameIdentity, "The same run, native session, Runner process and sandbox lease remain live after restart."),
    check("remote-restart-native-completion-once", nativeCompletion, "The original provider turn completes once and retains its native receipt prefix."),
    check("remote-restart-files-finalized", Boolean(saved), "The original run commits its workspace receipt and leaves no active operation or recovery."),
  ];
}