import fs from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import { execFile } from "node:child_process";
import { promisify } from "node:util";

const execFileAsync = promisify(execFile);
const LONG_TASK_WRAPPER_TIMEOUT_MS = 8000;
const LONG_TASK_GATE_LOCK_TIMEOUT_MS = 8000;

type GateLockResult = {
  gateRequired: boolean;
  gateStatus: "not_applicable" | "pass" | "fail";
  reasons?: string[];
  requiredEvidence?: Array<{
    evidenceKey?: string;
    acceptedFields?: string[];
    requiredValue?: string;
  }>;
  allowedResponseModes?: string[];
};

function clamp(s: string, max = 1200): string {
  if (!s) return s;
  if (s.length <= max) return s;
  return s.slice(0, max) + "\n…(truncated)…";
}

async function safeReadText(filePath: string): Promise<string | null> {
  try {
    const raw = await fs.readFile(filePath, "utf-8");
    const trimmed = raw.trim();
    return trimmed ? trimmed : null;
  } catch {
    return null;
  }
}

async function runJsonScript(scriptPath: string, workspaceDir: string, input: Record<string, unknown>, timeout: number): Promise<any | null> {
  let tempInputPath: string | null = null;

  try {
    tempInputPath = path.join(
      os.tmpdir(),
      `openclaw-hook-${path.basename(scriptPath, path.extname(scriptPath))}-${process.pid}-${Date.now()}.json`,
    );
    await fs.writeFile(tempInputPath, JSON.stringify(input), "utf-8");

    const { stdout } = await execFileAsync("node", [scriptPath, "--compact", "--input", tempInputPath], {
      cwd: workspaceDir,
      maxBuffer: 1024 * 1024,
      timeout,
    });

    return JSON.parse(stdout);
  } catch {
    return null;
  } finally {
    if (tempInputPath) {
      await fs.unlink(tempInputPath).catch(() => {});
    }
  }
}

async function runLongTaskWrapper(workspaceDir: string, ctx: any): Promise<any | null> {
  const wrapperPath = path.join(workspaceDir, "scripts", "long_task_governor_wrapper.mjs");
  const input = {
    requestText: (ctx.body ?? ctx.content ?? ctx.bodyForAgent ?? "") as string,
    hasFilesOrSystems: false,
    needsWaiting: false,
    needsSubagent: false,
    needsOwnerDecision: false,
    canReplyNow: false,
    taskName: "Hook preflight classification",
    currentStep: "Classifying request at preprocessed hook",
    nextStep: "Carry governor recommendation into prompt context",
    nextReportCondition: "At next meaningful milestone",
    waitingOn: "none",
    blocker: "none",
    checkpointTrigger: "",
    externalizedTrigger: "",
    triggerKind: "",
  };

  return runJsonScript(wrapperPath, workspaceDir, input, LONG_TASK_WRAPPER_TIMEOUT_MS);
}

function buildProgressEvidence(wrapperResult: any): Record<string, unknown> | null {
  const progressEvidence: Record<string, unknown> = {};

  const taskName = typeof wrapperResult?.taskRecord?.task_name === "string"
    ? wrapperResult.taskRecord.task_name.trim()
    : "";
  if (wrapperResult?.silentLaunchOk === true && taskName) {
    progressEvidence.sessionKey = taskName;
  }

  return Object.keys(progressEvidence).length > 0 ? progressEvidence : null;
}

function buildGateLockInput(wrapperResult: any): Record<string, unknown> {
  if (!wrapperResult || wrapperResult.classification !== "long_task") {
    return { classification: wrapperResult?.classification ?? "general_chat" };
  }

  const needsOwnerDecision = wrapperResult.needsOwnerDecision === true;
  const silentCandidate = wrapperResult.silentCandidate === true;
  const progressEvidence = buildProgressEvidence(wrapperResult);
  const requiredNextAction = typeof wrapperResult.requiredNextAction === "string"
    ? wrapperResult.requiredNextAction.trim()
    : "";
  const hasConcreteExecutionEvidence = Boolean(
    requiredNextAction
    && ![
      "",
      "proceed_with_normal_long_task_flow",
      "proceed_with_silent_launch",
      "define_first_checkpoint_trigger_before_silent_launch",
      "bind_externalized_checkpoint_path_or_abort_silent_launch",
    ].includes(requiredNextAction),
  );
  const executionEvidence = hasConcreteExecutionEvidence
    ? {
        concreteNextAction: requiredNextAction,
      }
    : null;
  const hasExternalizedCheckpointEvidence = wrapperResult.silentLaunchOk === true
    && typeof wrapperResult.taskRecord?.task_name === "string"
    && wrapperResult.taskRecord.task_name.trim().length > 0;
  const hasButtonPathClosureEvidence = needsOwnerDecision && wrapperResult.silentLaunchOk === true;
  const claimedProgression = wrapperResult.classification === "long_task"
    ? "already progressing to the next step in background"
    : "";

  return {
    classification: wrapperResult.classification,
    silentContinuation: silentCandidate,
    claimedExecution: true,
    needsOwnerDecision,
    nextStep: hasConcreteExecutionEvidence ? requiredNextAction : "",
    requiredNextAction: hasConcreteExecutionEvidence ? requiredNextAction : "",
    concreteNextAction: hasConcreteExecutionEvidence ? requiredNextAction : "",
    progressionClaim: claimedProgression,
    claimedProgression: claimedProgression,
    statusSummary: claimedProgression,
    executionEvidence,
    progressEvidence,
    sessionKey: typeof progressEvidence?.sessionKey === "string" ? progressEvidence.sessionKey : "",
    runId: typeof progressEvidence?.runId === "string" ? progressEvidence.runId : "",
    modified_files: Array.isArray(progressEvidence?.modified_files) ? progressEvidence.modified_files : [],
    verificationResult: typeof progressEvidence?.verificationResult === "string" ? progressEvidence.verificationResult : "",
    toolCallEvidence: "",
    dispatchEvidence: "",
    fileChangeEvidence: "",
    verificationEvidence: "",
    checkpointArtifactEvidence: hasExternalizedCheckpointEvidence ? wrapperResult.taskRecord.task_name.trim() : "",
    externalizedCheckpointPath: hasExternalizedCheckpointEvidence ? wrapperResult.taskRecord.task_name.trim() : "",
    externalizedTrigger: hasExternalizedCheckpointEvidence ? "hook-preflight-checkpoint" : "",
    handoffMode: hasButtonPathClosureEvidence ? (wrapperResult.handoff?.mode ?? "button_path") : "direct_reply",
    replyClosureMode: hasButtonPathClosureEvidence ? (wrapperResult.handoff?.mode ?? "button_path") : "direct_reply",
  };
}

async function runLongTaskGateLock(workspaceDir: string, wrapperResult: any): Promise<GateLockResult | null> {
  const gateLockPath = path.join(workspaceDir, "scripts", "long_task_gate_lock.mjs");
  const input = buildGateLockInput(wrapperResult);
  return runJsonScript(gateLockPath, workspaceDir, input, LONG_TASK_GATE_LOCK_TIMEOUT_MS);
}

function buildWrapperEnforcement(wrapperResult: any): string[] {
  const lines = [
    "- Treat this as ingress preflight guidance from the wrapper MVP.",
  ];

  if (wrapperResult.classification === "long_task") {
    lines.push("- ENFORCEMENT: This request defaults to long-task governance; do not treat it as ordinary single-turn chat unless you can clearly justify overriding the classifier.");
    lines.push("- ENFORCEMENT: If you proceed, prefer explicit task state and checkpoint discipline over ad-hoc continuation.");
  }

  if (wrapperResult.handoff?.mode === "button_path") {
    lines.push("- ENFORCEMENT: Owner decision is expected; plan Telegram button-path early instead of ending with a plain-text menu.");
  }

  if (wrapperResult.silentCandidate === true && wrapperResult.silentLaunchOk === false) {
    lines.push("- ENFORCEMENT: Silent launch is NOT allowed in the current form.");
    lines.push("- ENFORCEMENT: Use the recommended fallback before proceeding.");
    if (wrapperResult.requiredNextAction) {
      lines.push(`- ENFORCEMENT: Required next action = ${wrapperResult.requiredNextAction}`);
    }
  } else if (wrapperResult.silentCandidate === true && wrapperResult.silentLaunchOk === true) {
    lines.push("- ENFORCEMENT: Silent launch is only acceptable if you preserve externalized checkpoint discipline and do not rely on memory alone.");
  }

  return lines;
}

function buildWrapperHardGate(wrapperResult: any): string[] {
  const lines: string[] = [];

  if (wrapperResult.classification === "long_task") {
    lines.push("- HARD_GATE: If you intend to proceed as ordinary chat, you must explicitly justify why long-task governance does not apply.");
  }

  if (wrapperResult.handoff?.mode === "button_path") {
    lines.push("- HARD_GATE: Do not end this flow with a plain-text choice menu. Use Telegram inline buttons or execute the most reasonable next step directly.");
  }

  if (wrapperResult.silentCandidate === true && wrapperResult.silentLaunchOk === false) {
    lines.push("- HARD_GATE: Do NOT launch or continue this task in silent mode in its current form.");
    lines.push("- HARD_GATE: Before any silent execution, satisfy the required next action or downgrade to non-silent follow-up.");
  }

  return lines;
}

function buildGateLockBlock(gateLockResult: GateLockResult | null): string {
  if (!gateLockResult) {
    return [
      "[LONG_TASK_GATE_LOCK]",
      "gateStatus=degraded",
      "gateRequired=unknown",
      "- ENFORCEMENT: Gate-lock evaluator unavailable; keep existing long-task safeguards in force.",
      "- ENFORCEMENT: Do not claim you have progressed into the next task or are already pushing the next step unless you have concrete progress evidence such as a sessionKey, runId, modified_files record, verification result, actual dispatch, tool calls, file changes, or a persisted checkpoint artifact.",
      "- HARD_GATE: Evaluator unavailable is not permission to claim silent continuation or next-task progression without verifiable progress evidence.",
      "- HARD_GATE: Fall back to a non-silent, evidence-preserving follow-up if you cannot prove checkpoint state or concrete execution.",
      "[/LONG_TASK_GATE_LOCK]",
      "",
    ].join("\n");
  }

  const lines = [
    "[LONG_TASK_GATE_LOCK]",
    `gateRequired=${gateLockResult.gateRequired}`,
    `gateStatus=${gateLockResult.gateStatus}`,
    ...(gateLockResult.reasons ?? []).map((reason) => `reason=${reason}`),
    ...((gateLockResult.requiredEvidence ?? []).map((requirement) => {
      const fields = (requirement.acceptedFields ?? []).join(",");
      return `requiredEvidence=${requirement.evidenceKey ?? "unknown"};fields=${fields};requiredValue=${requirement.requiredValue ?? "unknown"}`;
    })),
    ...((gateLockResult.allowedResponseModes ?? []).map((mode) => `allowedResponseMode=${mode}`)),
    "- ENFORCEMENT: Do not claim you have progressed into the next task or are already pushing the next step unless you have concrete progress evidence such as a sessionKey, runId, modified_files record, verification result, actual dispatch, tool calls, file changes, or a persisted checkpoint artifact.",
    "- ENFORCEMENT: Forbidden path: plain-text handoff that pretends the long task is already continuing without an externalized checkpoint.",
    "- ENFORCEMENT: Forbidden path: stating you have already entered the next task/step when the record only contains planning language and no concrete execution evidence.",
  ];

  if (gateLockResult.gateStatus === "fail") {
    lines.push("- HARD_GATE: Block any plain-text handoff or silent-continuation claim when externalized checkpoint evidence is missing.");
    lines.push("- HARD_GATE: Block any reply path that says you already moved into the next task or are advancing the next step without concrete progress evidence.");
    lines.push("- HARD_GATE: Do not say you are already on the next task, already dispatched follow-up work, or already progressing in background unless you can point to a sessionKey, runId, modified_files record, verification result, actual tool execution, file changes, emitted messages, or checkpoint records.");
    lines.push("- HARD_GATE: If required evidence is missing, ask for/produce the checkpoint or downgrade to a non-silent, evidence-preserving follow-up.");
    lines.push("- HARD_GATE: If owner decision is involved, do not replace button-path closure with plain-text handoff.");
  }

  lines.push("[/LONG_TASK_GATE_LOCK]", "");
  return lines.join("\n");
}

/**
 * Force Recall hook handler
 *
 * Event: message:preprocessed
 * - Reads docs/RULEBOOK.md and SOUL.md from the resolved workspace
 * - Prepends a recall gate block to context.bodyForAgent
 * - Optionally injects wrapper MVP classification hints when available
 */
const forceRecall = async (event: any) => {
  if (event?.type !== "message" || event?.action !== "preprocessed") return;

  const ctx = event.context ?? {};
  const workspaceDir: string | undefined = ctx.workspaceDir;
  if (!workspaceDir) return;

  const rulebookPath = path.join(workspaceDir, "docs", "RULEBOOK.md");
  const soulPath = path.join(workspaceDir, "SOUL.md");

  const [rulebook, soul, wrapperResult] = await Promise.all([
    safeReadText(rulebookPath),
    safeReadText(soulPath),
    runLongTaskWrapper(workspaceDir, ctx),
  ]);
  const gateLockResult = wrapperResult ? await runLongTaskGateLock(workspaceDir, wrapperResult) : null;

  if (!rulebook && !soul && !wrapperResult && !gateLockResult) return;

  const wrapperBlock = wrapperResult
    ? [
        "[LONG_TASK_GOVERNOR_PREFLIGHT]",
        `classification=${wrapperResult.classification}`,
        `silentCandidate=${wrapperResult.silentCandidate}`,
        `needsCheckpoint=${wrapperResult.needsCheckpoint}`,
        `needsSubagent=${wrapperResult.needsSubagent}`,
        `needsOwnerDecision=${wrapperResult.needsOwnerDecision}`,
        `silentLaunchOk=${wrapperResult.silentLaunchOk}`,
        wrapperResult.silentLaunchReason ? `silentLaunchReason=${wrapperResult.silentLaunchReason}` : null,
        wrapperResult.recommendedFallback ? `recommendedFallback=${wrapperResult.recommendedFallback}` : null,
        wrapperResult.requiredNextAction ? `requiredNextAction=${wrapperResult.requiredNextAction}` : null,
        wrapperResult.handoff?.mode ? `handoff.mode=${wrapperResult.handoff.mode}` : null,
        ...buildWrapperEnforcement(wrapperResult),
        ...buildWrapperHardGate(wrapperResult),
        "[/LONG_TASK_GOVERNOR_PREFLIGHT]",
        "",
      ]
        .filter(Boolean)
        .join("\n")
    : "";

  const gateLockBlock = buildGateLockBlock(gateLockResult);

  const recallBlock = [
    "[RECALL_GATE] Mandatory recall before ANY technical action/tool use.",
    "- You MUST consult and follow the key rules from RULEBOOK + SOUL.",
    "- If you are about to run tools, change configs, modify code, or delegate agents: restate the applicable rules first.",
    "",
    wrapperBlock || null,
    gateLockBlock,
    rulebook ? `RULEBOOK (source: ${rulebookPath}):\n${clamp(rulebook, 1200)}` : null,
    soul ? `SOUL (source: ${soulPath}):\n${clamp(soul, 1200)}` : null,
    "[/RECALL_GATE]",
    "",
  ]
    .filter(Boolean)
    .join("\n");

  const prior = (ctx.bodyForAgent ?? ctx.body ?? ctx.content ?? "") as string;
  const injected = `${recallBlock}${prior ? "\n" + prior : ""}`;

  ctx.bodyForAgent = injected;
  event.context = ctx;

  if (process.env.OPENCLAW_FORCE_RECALL_DEBUG === "1") {
    ctx.bodyForAgent += "\n\n[force-recall:debug] injected";
    console.log(`[force-recall:debug] injected for chat=${ctx.chatId ?? "?"} msg=${ctx.messageId ?? "?"}`);
  }
};

export default forceRecall;