import type { AgentRunStore } from "./store.js";
import type { CommandRecord, JsonRecord, JsonValue, RunEvent, RunRecord, RunnerJobRecord, TerminalStatus } from "../common/types.js";
import { boundedTextSummary, outputBytesFromPayload, outputTruncatedFromPayload } from "../common/output.js";

const maxToolCallSummaryItems = 40;
const toolCallCommandLimitChars = 600;
const toolCallFieldLimitChars = 200;

const RESULT_EVENT_PAGE_LIMIT = 500;
const RESULT_EVENT_MAX_PAGES = 200;

interface ResultEventPage {
  events: RunEvent[];
  capped: boolean;
  nextAfterSeq: number | null;
}

interface AssistantReplySummary {
  text: string;
  seq: number | null;
  source: string | null;
  final: boolean;
  replyAuthority: boolean;
  textTruncated: boolean;
  outputTruncated: boolean;
}

export async function buildRunResult(store: AgentRunStore, runId: string, commandId?: string): Promise<JsonRecord> {
  const run = await store.getRun(runId);
  const command = await selectCommand(store, runId, commandId);
  const eventPage = await listResultEvents(store, runId);
  const events = eventPage.events;
  const scopedEvents = command ? eventsForCommand(events, command.id) : events;
  const jobs = await store.listRunnerJobs(runId, command?.id);
  const latestJob = jobs.at(-1) ?? null;
  const commandTerminal = command ? terminalFromCommand(command) : null;
  const terminalEventStatus = terminalFromEvents(scopedEvents);
  const terminal = commandTerminal ?? terminalEventStatus ?? run.terminalStatus;
  const terminalSource = commandTerminal ? "command-record" : terminalEventStatus ? "terminal_status-event" : run.terminalStatus ? "run-record" : "none";
  const failureKind = command ? failureKindFromEvents(scopedEvents) : run.failureKind ?? failureKindFromEvents(scopedEvents);
  const failureMessage = command ? messageFromEvents(scopedEvents) : run.failureMessage ?? messageFromEvents(scopedEvents);
  const reply = assistantReply(scopedEvents);
  const blocker = terminal === "blocked" || terminal === "failed" ? { failureKind, message: failureMessage } : null;
  const liveness = livenessSnapshot(run, command, events, scopedEvents, terminal);
  const steerDelivery = command?.type === "steer" ? steerDeliverySummary(events, command.id) : null;
  return {
    runId: run.id,
    commandId: command?.id ?? commandId ?? null,
    attemptId: latestJob?.attemptId ?? attemptFromEvents(events),
    runnerId: latestJob?.runnerId ?? null,
    jobName: latestJob?.jobName ?? null,
    namespace: latestJob?.namespace ?? null,
    status: command?.state ?? run.status,
    runStatus: run.status,
    commandState: command?.state ?? null,
    terminalStatus: terminal,
    terminalSource,
    completed: terminal === "completed",
    reply: reply.text,
    finalResponse: {
      text: reply.text,
      seq: reply.seq,
      source: reply.source,
      final: reply.final,
      replyAuthority: reply.replyAuthority,
      textTruncated: reply.textTruncated,
      outputTruncated: reply.outputTruncated,
    },
    finalAssistantSeq: reply.seq,
    finalAssistantSource: reply.source,
    finalAssistantTextTruncated: reply.textTruncated,
    finalAssistantOutputTruncated: reply.outputTruncated,
    failureKind,
    failureMessage,
    blocker,
    liveness,
    ...(steerDelivery ? { steerDelivery } : {}),
    lastSeq: events.at(-1)?.seq ?? 0,
    eventCount: events.length,
    eventsCapped: eventPage.capped,
    nextAfterSeq: eventPage.nextAfterSeq,
    scopedEventCount: scopedEvents.length,
    scopedLastSeq: scopedEvents.at(-1)?.seq ?? 0,
    artifactSummary: artifactSummary(scopedEvents),
    toolCallSummary: toolCallSummary(scopedEvents),
    sessionRef: sessionSummary(run),
    resourceBundleRef: resourceBundleSummary(run, events),
    runnerJobCount: jobs.length,
  };
}

function livenessSnapshot(run: RunRecord, command: CommandRecord | null, events: RunEvent[], scopedEvents: RunEvent[], terminal: TerminalStatus | null): JsonRecord {
  const nowMs = Date.now();
  const active = terminal === null && !runIsTerminal(run) && !commandIsTerminal(command);
  const lastEvent = events.at(-1) ?? null;
  const lastVisibleActivity = latestVisibleActivity(scopedEvents);
  const lastCommandActivity = lastVisibleActivity ?? latestLivenessActivity(scopedEvents);
  const lease = leaseSummary(run, nowMs);
  const transportDisconnect = latestTransportDisconnect(scopedEvents);
  const phase = livenessPhase({ active, command, lastVisibleActivity, leaseExpired: lease.leaseExpired, transportDisconnect });
  return {
    phase,
    active,
    observedAt: new Date(nowMs).toISOString(),
    runStatus: run.status,
    commandId: command?.id ?? null,
    commandType: command?.type ?? null,
    commandState: command?.state ?? null,
    lastSeq: lastEvent?.seq ?? 0,
    lastEventAt: lastEvent?.createdAt ?? null,
    lastEventAgeMs: lastEvent ? ageMs(lastEvent.createdAt, nowMs) : null,
    lastCommandActivity: livenessActivitySummary(lastCommandActivity, nowMs),
    lease,
    transportDisconnect: transportDisconnect ? livenessActivitySummary(transportDisconnect, nowMs) : null,
    recoveryActions: active ? recoveryActions(run, command, lastEvent?.seq ?? 0) : [],
    valuesPrinted: false,
  };
}

function livenessPhase(input: { active: boolean; command: CommandRecord | null; lastVisibleActivity: RunEvent | null; leaseExpired: boolean | null; transportDisconnect: RunEvent | null }): string {
  if (!input.active) return "terminal";
  if (input.command?.state === "pending") return "waiting-runner";
  if (input.leaseExpired === true) return "runner-heartbeat-stale";
  if (input.transportDisconnect) return "transport-disconnected";
  if (input.lastVisibleActivity?.type === "tool_call") {
    const status = input.lastVisibleActivity.payload.status;
    if (status === "inProgress" || status === "running") return "waiting-tool";
    if (status === "completed") return "idle-after-tool";
  }
  return "waiting-model";
}

function leaseSummary(run: RunRecord, nowMs: number): JsonRecord & { leaseExpired: boolean | null } {
  const leaseExpiresMs = run.leaseExpiresAt ? Date.parse(run.leaseExpiresAt) : NaN;
  const hasLease = Boolean(run.claimedBy && run.leaseExpiresAt && Number.isFinite(leaseExpiresMs));
  const leaseExpired = run.claimedBy ? (hasLease ? leaseExpiresMs <= nowMs : true) : null;
  return {
    claimedBy: run.claimedBy,
    leaseExpiresAt: run.leaseExpiresAt,
    leaseExpired,
    leaseRemainingMs: hasLease ? Math.max(0, leaseExpiresMs - nowMs) : null,
    valuesPrinted: false,
  };
}

function latestLivenessActivity(events: RunEvent[]): RunEvent | null {
  return [...events].reverse().find(isLivenessActivityEvent) ?? null;
}

function latestVisibleActivity(events: RunEvent[]): RunEvent | null {
  return [...events].reverse().find((event) => event.type === "assistant_message" || event.type === "tool_call" || event.type === "command_output" || event.type === "diff" || event.type === "error" || event.type === "terminal_status") ?? null;
}

function isLivenessActivityEvent(event: RunEvent): boolean {
  if (event.type === "assistant_message" || event.type === "tool_call" || event.type === "command_output" || event.type === "diff" || event.type === "error" || event.type === "terminal_status") return true;
  if (event.type !== "backend_status") return false;
  const phase = typeof event.payload.phase === "string" ? event.payload.phase : "";
  return ["backend-turn-started", "thread/start:completed", "thread/resume:completed", "turn/start:completed", "backend-turn-finished", "codex-app-server-closed"].includes(phase);
}

function latestTransportDisconnect(events: RunEvent[]): RunEvent | null {
  return [...events].reverse().find((event) => {
    const phase = typeof event.payload.phase === "string" ? event.payload.phase : "";
    return (event.type === "error" && phase.includes("transport")) || (event.type === "backend_status" && phase === "codex-app-server-closed");
  }) ?? null;
}

function livenessActivitySummary(event: RunEvent | null, nowMs: number): JsonRecord | null {
  if (!event) return null;
  return {
    seq: event.seq,
    type: event.type,
    phase: typeof event.payload.phase === "string" ? event.payload.phase : null,
    status: typeof event.payload.status === "string" ? event.payload.status : null,
    toolName: typeof event.payload.toolName === "string" ? event.payload.toolName : null,
    exitCode: normalizedExitCode(event.payload.exitCode),
    commandId: typeof event.payload.commandId === "string" ? event.payload.commandId : null,
    createdAt: event.createdAt,
    ageMs: ageMs(event.createdAt, nowMs),
    valuesPrinted: false,
  };
}

function ageMs(value: string, nowMs: number): number | null {
  const parsed = Date.parse(value);
  return Number.isFinite(parsed) ? Math.max(0, nowMs - parsed) : null;
}

function recoveryActions(run: RunRecord, command: CommandRecord | null, afterSeq: number): JsonRecord[] {
  const actions: JsonRecord[] = [
    { action: "poll-trace", runId: run.id, afterSeq },
    { action: "poll-output", runId: run.id, afterSeq },
  ];
  if (command) actions.push({ action: "cancel-command", runId: run.id, commandId: command.id });
  else actions.push({ action: "cancel-run", runId: run.id });
  return actions;
}

function steerDeliverySummary(events: RunEvent[], commandId: string): JsonRecord {
  const related = events.filter((event) => event.payload.commandId === commandId);
  const completed = latestPhaseEvent(related, "turn/steer:completed");
  const acknowledged = latestPhaseEvent(related, "steer-command-acknowledged");
  const failed = [...related].reverse().find((event) => event.type === "error") ?? null;
  const deliverySeq = completed?.seq ?? failed?.seq ?? acknowledged?.seq ?? related.at(-1)?.seq ?? null;
  const targetCommandId = targetCommandIdFromEvents(related);
  const targetFollowUp = targetCommandId && deliverySeq !== null ? targetFollowUpAfterSeq(events, targetCommandId, deliverySeq) : null;
  return {
    commandId,
    targetCommandId,
    deliveryState: failed ? "failed" : completed ? "forwarded-to-backend" : acknowledged ? "acknowledged-by-runner" : "not-observed",
    backendAccepted: Boolean(completed),
    targetFollowUpObserved: targetFollowUp?.observed ?? null,
    targetFollowUpSeq: targetFollowUp?.seq ?? null,
    targetFollowUpType: targetFollowUp?.type ?? null,
    targetFollowUpPhase: targetFollowUp?.phase ?? null,
    semantics: "steer completion means the backend accepted the turn/steer RPC; target turn progress is reported by the target command liveness and is not implied by the steer command terminal state",
    valuesPrinted: false,
  };
}

function latestPhaseEvent(events: RunEvent[], phase: string): RunEvent | null {
  return [...events].reverse().find((event) => event.payload.phase === phase) ?? null;
}

function targetCommandIdFromEvents(events: RunEvent[]): string | null {
  for (const event of [...events].reverse()) {
    const targetCommandId = event.payload.targetCommandId;
    if (typeof targetCommandId === "string" && targetCommandId.length > 0) return targetCommandId;
  }
  return null;
}

function targetFollowUpAfterSeq(events: RunEvent[], targetCommandId: string, afterSeq: number): JsonRecord {
  const event = events.find((item) => item.seq > afterSeq && item.payload.commandId === targetCommandId && isTargetFollowUpEvent(item));
  return {
    observed: Boolean(event),
    seq: event?.seq ?? null,
    type: event?.type ?? null,
    phase: typeof event?.payload.phase === "string" ? event.payload.phase : null,
  };
}

function isTargetFollowUpEvent(event: RunEvent): boolean {
  return event.type === "assistant_message" || event.type === "tool_call" || event.type === "command_output" || event.type === "diff" || event.type === "error" || event.type === "terminal_status";
}

function runIsTerminal(run: RunRecord): boolean {
  return run.status === "completed" || run.status === "failed" || run.status === "blocked" || run.status === "cancelled";
}

function commandIsTerminal(command: CommandRecord | null): boolean {
  return command ? terminalFromCommand(command) !== null : false;
}

async function listResultEvents(store: AgentRunStore, runId: string): Promise<ResultEventPage> {
  const events: RunEvent[] = [];
  let afterSeq = 0;
  for (let pageIndex = 0; pageIndex < RESULT_EVENT_MAX_PAGES; pageIndex += 1) {
    const page = await store.listEvents(runId, afterSeq, RESULT_EVENT_PAGE_LIMIT);
    if (page.length === 0) return { events, capped: false, nextAfterSeq: null };
    events.push(...page);
    const nextAfterSeq = page.at(-1)?.seq ?? afterSeq;
    if (nextAfterSeq <= afterSeq) return { events, capped: true, nextAfterSeq: afterSeq };
    afterSeq = nextAfterSeq;
    if (page.length < RESULT_EVENT_PAGE_LIMIT) return { events, capped: false, nextAfterSeq: null };
  }
  return { events, capped: true, nextAfterSeq: events.at(-1)?.seq ?? afterSeq };
}

async function selectCommand(store: AgentRunStore, runId: string, commandId?: string): Promise<CommandRecord | null> {
  if (commandId) {
    const command = await store.getCommand(commandId);
    return command.runId === runId ? command : null;
  }
  const commands = await store.listCommands(runId, 0, 100);
  return commands.at(-1) ?? null;
}

function terminalFromEvents(events: RunEvent[]): TerminalStatus | null {
  for (const event of [...events].reverse()) {
    if (event.type !== "terminal_status") continue;
    const value = event.payload.terminalStatus;
    if (value === "completed" || value === "failed" || value === "blocked" || value === "cancelled") return value;
  }
  return null;
}

function terminalFromCommand(command: CommandRecord): TerminalStatus | null {
  if (command.state === "completed") return "completed";
  if (command.state === "failed") return "failed";
  if (command.state === "cancelled") return "cancelled";
  return null;
}

function eventsForCommand(events: RunEvent[], commandId: string): RunEvent[] {
  const scoped = events.filter((event) => event.payload.commandId === commandId || typeof event.payload.commandId !== "string");
  return scoped.length > 0 ? scoped : events;
}

function failureKindFromEvents(events: RunEvent[]): string | null {
  for (const event of [...events].reverse()) {
    const value = event.payload.failureKind;
    if (typeof value === "string") return value;
  }
  return null;
}

function messageFromEvents(events: RunEvent[]): string | null {
  for (const event of [...events].reverse()) {
    const value = event.payload.message;
    if (typeof value === "string" && value.length > 0) return value;
  }
  return null;
}

function assistantReply(events: RunEvent[]): AssistantReplySummary {
  const assistantEvents = events.filter((event) => event.type === "assistant_message");
  const latestAuthoritative = [...assistantEvents].reverse().find((event) => (event.payload.replyAuthority === true || event.payload.final === true) && textPayload(event.payload).length > 0);
  if (latestAuthoritative) return assistantReplySummary(latestAuthoritative);
  const latestAssistant = [...assistantEvents].reverse().find((event) => textPayload(event.payload).length > 0);
  if (latestAssistant) return assistantReplySummary(latestAssistant);
  return { text: "", seq: null, source: null, final: false, replyAuthority: false, textTruncated: false, outputTruncated: false };
}

function assistantReplySummary(event: RunEvent): AssistantReplySummary {
  return {
    text: textPayload(event.payload),
    seq: event.seq,
    source: typeof event.payload.source === "string" ? event.payload.source : null,
    final: event.payload.final === true,
    replyAuthority: event.payload.replyAuthority === true,
    textTruncated: event.payload.textTruncated === true,
    outputTruncated: event.payload.outputTruncated === true,
  };
}

function textPayload(payload: JsonRecord): string {
  for (const key of ["text", "content", "delta"]) {
    const value = payload[key];
    if (typeof value === "string") return value;
  }
  return "";
}

function artifactSummary(events: RunEvent[]): JsonRecord {
  let commandOutputEvents = 0;
  let diffEvents = 0;
  let toolCallEvents = 0;
  let outputChars = 0;
  let outputBytes = 0;
  let outputTruncatedEvents = 0;
  const streamSummary: Record<string, { events: number; outputBytes: number; outputTruncated: boolean }> = {
    stdout: { events: 0, outputBytes: 0, outputTruncated: false },
    stderr: { events: 0, outputBytes: 0, outputTruncated: false },
  };
  for (const event of events) {
    if (event.type === "command_output") {
      commandOutputEvents += 1;
      const text = textPayload(event.payload);
      outputChars += text.length;
      const bytes = outputBytesFromPayload(event.payload);
      outputBytes += bytes;
      const truncated = outputTruncatedFromPayload(event.payload);
      if (truncated) outputTruncatedEvents += 1;
      const stream = event.payload.stream === "stderr" ? "stderr" : "stdout";
      streamSummary[stream].events += 1;
      streamSummary[stream].outputBytes += bytes;
      streamSummary[stream].outputTruncated ||= truncated;
    }
    if (event.type === "diff") diffEvents += 1;
    if (event.type === "tool_call") toolCallEvents += 1;
  }
  return { commandOutputEvents, diffEvents, toolCallEvents, outputChars, outputBytes, truncatedEvents: outputTruncatedEvents, outputTruncatedEvents, stdoutSummary: streamSummary.stdout, stderrSummary: streamSummary.stderr };
}

function toolCallSummary(events: RunEvent[]): JsonRecord {
  const toolCallEvents = events.filter((event) => event.type === "tool_call");
  const statusCounts: Record<string, number> = {};
  const exitCodeCounts: Record<string, number> = {};
  for (const event of toolCallEvents) {
    const status = typeof event.payload.status === "string" && event.payload.status.length > 0 ? event.payload.status : "unknown";
    statusCounts[status] = (statusCounts[status] ?? 0) + 1;
    const exitCode = normalizedExitCode(event.payload.exitCode);
    if (exitCode !== null) exitCodeCounts[String(exitCode)] = (exitCodeCounts[String(exitCode)] ?? 0) + 1;
  }
  const window = toolCallEvents.slice(-maxToolCallSummaryItems);
  return {
    count: toolCallEvents.length,
    statusCounts,
    exitCodeCounts,
    items: window.map((event) => toolCallItemSummary(event)),
    itemsOmitted: Math.max(0, toolCallEvents.length - window.length),
    itemWindow: "latest",
    valuesPrinted: false,
  };
}

function toolCallItemSummary(event: RunEvent): JsonRecord {
  const payload = event.payload;
  return {
    seq: event.seq,
    createdAt: event.createdAt,
    method: boundedOptionalString(payload.method, toolCallFieldLimitChars),
    toolName: boundedOptionalString(payload.toolName, toolCallFieldLimitChars),
    type: boundedOptionalString(payload.type, toolCallFieldLimitChars),
    itemId: boundedOptionalString(payload.itemId, toolCallFieldLimitChars),
    status: boundedOptionalString(payload.status, toolCallFieldLimitChars),
    exitCode: normalizedExitCode(payload.exitCode),
    processId: boundedOptionalString(payload.processId, toolCallFieldLimitChars),
    cwd: boundedOptionalString(payload.cwd, toolCallFieldLimitChars),
    command: boundedOptionalString(payload.command, toolCallCommandLimitChars),
    commandTruncated: optionalStringTruncated(payload.command, toolCallCommandLimitChars),
    valuesPrinted: false,
  };
}

function boundedOptionalString(value: JsonValue | undefined, limitChars: number): string | null {
  if (typeof value !== "string") return null;
  return boundedTextSummary(value, { limitChars }).text as string;
}

function optionalStringTruncated(value: JsonValue | undefined, limitChars: number): boolean {
  if (typeof value !== "string") return false;
  return boundedTextSummary(value, { limitChars }).outputTruncated === true;
}

function normalizedExitCode(value: JsonValue | undefined): number | null {
  return typeof value === "number" && Number.isFinite(value) ? value : null;
}

function attemptFromEvents(events: RunEvent[]): string | null {
  for (const event of [...events].reverse()) {
    const value = event.payload.attemptId;
    if (typeof value === "string") return value;
  }
  return null;
}

function sessionSummary(run: RunRecord): JsonRecord | null {
  if (!run.sessionRef) return null;
  return {
    sessionId: run.sessionRef.sessionId,
    conversationId: run.sessionRef.conversationId ?? null,
    threadId: run.sessionRef.threadId ?? null,
    expiresAt: run.sessionRef.expiresAt ?? null,
    metadataKeys: Object.keys(run.sessionRef.metadata ?? {}).sort(),
    valuesPrinted: false,
  };
}

function resourceBundleSummary(run: RunRecord, events: RunEvent[]): JsonRecord | null {
  if (!run.resourceBundleRef) return null;
  const materialized = events.find((event) => event.type === "backend_status" && event.payload.phase === "resource-bundle-materialized")?.payload ?? null;
  return {
    kind: run.resourceBundleRef.kind,
    repoUrl: run.resourceBundleRef.repoUrl,
    commitId: run.resourceBundleRef.commitId ?? null,
    ref: run.resourceBundleRef.ref ?? null,
    bundles: {
      count: run.resourceBundleRef.bundles.length,
      items: run.resourceBundleRef.bundles.map((item) => ({ name: item.name ?? null, repoUrl: item.repoUrl ?? run.resourceBundleRef?.repoUrl ?? null, commitId: item.commitId ?? run.resourceBundleRef?.commitId ?? null, ref: item.ref ?? run.resourceBundleRef?.ref ?? null, subpath: item.subpath, targetPath: item.targetPath, valuesPrinted: false })),
      valuesPrinted: false,
    },
    promptRefs: run.resourceBundleRef.promptRefs ? { count: run.resourceBundleRef.promptRefs.length, names: run.resourceBundleRef.promptRefs.map((item) => item.name), required: run.resourceBundleRef.promptRefs.filter((item) => item.required === true).map((item) => item.name), valuesPrinted: false } : { count: 0, names: [], required: [], valuesPrinted: false },
    materialized: materialized as JsonValue,
  };
}