import crypto from "node:crypto";
import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { DEFAULT_AGENT_ID } from "../routing/session-key.js";
import { requestJsonlSocket } from "./jsonl-socket.js";
export * from "./exec-approvals-analysis.js";
export * from "./exec-approvals-allowlist.js";

export type ExecHost = "sandbox" | "gateway" | "node";
export type ExecSecurity = "deny" | "allowlist" | "full";
export type ExecAsk = "off" | "on-miss" | "always";

export type ExecApprovalRequest = {
  id: string;
  request: {
    command: string;
    cwd?: string | null;
    host?: string | null;
    security?: string | null;
    ask?: string | null;
    agentId?: string | null;
    resolvedPath?: string | null;
    sessionKey?: string | null;
  };
  createdAtMs: number;
  expiresAtMs: number;
};

export type ExecApprovalResolved = {
  id: string;
  decision: ExecApprovalDecision;
  resolvedBy?: string | null;
  ts: number;
};

export type ExecApprovalsDefaults = {
  security?: ExecSecurity;
  ask?: ExecAsk;
  askFallback?: ExecSecurity;
  autoAllowSkills?: boolean;
};

export type ExecAllowlistEntry = {
  id?: string;
  pattern: string;
  lastUsedAt?: number;
  lastUsedCommand?: string;
  lastResolvedPath?: string;
};

export type ExecApprovalsAgent = ExecApprovalsDefaults & {
  allowlist?: ExecAllowlistEntry[];
};

export type ExecApprovalsFile = {
  version: 1;
  socket?: {
    path?: string;
    token?: string;
  };
  defaults?: ExecApprovalsDefaults;
  agents?: Record<string, ExecApprovalsAgent>;
};

export type ExecApprovalsSnapshot = {
  path: string;
  exists: boolean;
  raw: string | null;
  file: ExecApprovalsFile;
  hash: string;
};

export type ExecApprovalsResolved = {
  path: string;
  socketPath: string;
  token: string;
  defaults: Required<ExecApprovalsDefaults>;
  agent: Required<ExecApprovalsDefaults>;
  allowlist: ExecAllowlistEntry[];
  file: ExecApprovalsFile;
};

// Keep CLI + gateway defaults in sync.
export const DEFAULT_EXEC_APPROVAL_TIMEOUT_MS = 120_000;

const DEFAULT_SECURITY: ExecSecurity = "deny";
const DEFAULT_ASK: ExecAsk = "on-miss";
const DEFAULT_ASK_FALLBACK: ExecSecurity = "deny";
const DEFAULT_AUTO_ALLOW_SKILLS = false;
const DEFAULT_SOCKET = "~/.openclaw/exec-approvals.sock";
const DEFAULT_FILE = "~/.openclaw/exec-approvals.json";

function hashExecApprovalsRaw(raw: string | null): string {
  return crypto
    .createHash("sha256")
    .update(raw ?? "")
    .digest("hex");
}

function expandHome(value: string): string {
  if (!value) {
    return value;
  }
  if (value === "~") {
    return os.homedir();
  }
  if (value.startsWith("~/")) {
    return path.join(os.homedir(), value.slice(2));
  }
  return value;
}

export function resolveExecApprovalsPath(): string {
  return expandHome(DEFAULT_FILE);
}

export function resolveExecApprovalsSocketPath(): string {
  return expandHome(DEFAULT_SOCKET);
}

function normalizeAllowlistPattern(value: string | undefined): string | null {
  const trimmed = value?.trim() ?? "";
  return trimmed ? trimmed.toLowerCase() : null;
}

function mergeLegacyAgent(
  current: ExecApprovalsAgent,
  legacy: ExecApprovalsAgent,
): ExecApprovalsAgent {
  const allowlist: ExecAllowlistEntry[] = [];
  const seen = new Set<string>();
  const pushEntry = (entry: ExecAllowlistEntry) => {
    const key = normalizeAllowlistPattern(entry.pattern);
    if (!key || seen.has(key)) {
      return;
    }
    seen.add(key);
    allowlist.push(entry);
  };
  for (const entry of current.allowlist ?? []) {
    pushEntry(entry);
  }
  for (const entry of legacy.allowlist ?? []) {
    pushEntry(entry);
  }

  return {
    security: current.security ?? legacy.security,
    ask: current.ask ?? legacy.ask,
    askFallback: current.askFallback ?? legacy.askFallback,
    autoAllowSkills: current.autoAllowSkills ?? legacy.autoAllowSkills,
    allowlist: allowlist.length > 0 ? allowlist : undefined,
  };
}

function ensureDir(filePath: string) {
  const dir = path.dirname(filePath);
  fs.mkdirSync(dir, { recursive: true });
}

// Coerce legacy/corrupted allowlists into `ExecAllowlistEntry[]` before we spread
// entries to add ids (spreading strings creates {"0":"l","1":"s",...}).
function coerceAllowlistEntries(allowlist: unknown): ExecAllowlistEntry[] | undefined {
  if (!Array.isArray(allowlist) || allowlist.length === 0) {
    return Array.isArray(allowlist) ? (allowlist as ExecAllowlistEntry[]) : undefined;
  }
  let changed = false;
  const result: ExecAllowlistEntry[] = [];
  for (const item of allowlist) {
    if (typeof item === "string") {
      const trimmed = item.trim();
      if (trimmed) {
        result.push({ pattern: trimmed });
        changed = true;
      } else {
        changed = true; // dropped empty string
      }
    } else if (item && typeof item === "object" && !Array.isArray(item)) {
      const pattern = (item as { pattern?: unknown }).pattern;
      if (typeof pattern === "string" && pattern.trim().length > 0) {
        result.push(item as ExecAllowlistEntry);
      } else {
        changed = true; // dropped invalid entry
      }
    } else {
      changed = true; // dropped invalid entry
    }
  }
  return changed ? (result.length > 0 ? result : undefined) : (allowlist as ExecAllowlistEntry[]);
}

function ensureAllowlistIds(
  allowlist: ExecAllowlistEntry[] | undefined,
): ExecAllowlistEntry[] | undefined {
  if (!Array.isArray(allowlist) || allowlist.length === 0) {
    return allowlist;
  }
  let changed = false;
  const next = allowlist.map((entry) => {
    if (entry.id) {
      return entry;
    }
    changed = true;
    return { ...entry, id: crypto.randomUUID() };
  });
  return changed ? next : allowlist;
}

export function normalizeExecApprovals(file: ExecApprovalsFile): ExecApprovalsFile {
  const socketPath = file.socket?.path?.trim();
  const token = file.socket?.token?.trim();
  const agents = { ...file.agents };
  const legacyDefault = agents.default;
  if (legacyDefault) {
    const main = agents[DEFAULT_AGENT_ID];
    agents[DEFAULT_AGENT_ID] = main ? mergeLegacyAgent(main, legacyDefault) : legacyDefault;
    delete agents.default;
  }
  for (const [key, agent] of Object.entries(agents)) {
    const coerced = coerceAllowlistEntries(agent.allowlist);
    const allowlist = ensureAllowlistIds(coerced);
    if (allowlist !== agent.allowlist) {
      agents[key] = { ...agent, allowlist };
    }
  }
  const normalized: ExecApprovalsFile = {
    version: 1,
    socket: {
      path: socketPath && socketPath.length > 0 ? socketPath : undefined,
      token: token && token.length > 0 ? token : undefined,
    },
    defaults: {
      security: file.defaults?.security,
      ask: file.defaults?.ask,
      askFallback: file.defaults?.askFallback,
      autoAllowSkills: file.defaults?.autoAllowSkills,
    },
    agents,
  };
  return normalized;
}

export function mergeExecApprovalsSocketDefaults(params: {
  normalized: ExecApprovalsFile;
  current?: ExecApprovalsFile;
}): ExecApprovalsFile {
  const currentSocketPath = params.current?.socket?.path?.trim();
  const currentToken = params.current?.socket?.token?.trim();
  const socketPath =
    params.normalized.socket?.path?.trim() ?? currentSocketPath ?? resolveExecApprovalsSocketPath();
  const token = params.normalized.socket?.token?.trim() ?? currentToken ?? "";
  return {
    ...params.normalized,
    socket: {
      path: socketPath,
      token,
    },
  };
}

function generateToken(): string {
  return crypto.randomBytes(24).toString("base64url");
}

export function readExecApprovalsSnapshot(): ExecApprovalsSnapshot {
  const filePath = resolveExecApprovalsPath();
  if (!fs.existsSync(filePath)) {
    const file = normalizeExecApprovals({ version: 1, agents: {} });
    return {
      path: filePath,
      exists: false,
      raw: null,
      file,
      hash: hashExecApprovalsRaw(null),
    };
  }
  const raw = fs.readFileSync(filePath, "utf8");
  let parsed: ExecApprovalsFile | null = null;
  try {
    parsed = JSON.parse(raw) as ExecApprovalsFile;
  } catch {
    parsed = null;
  }
  const file =
    parsed?.version === 1
      ? normalizeExecApprovals(parsed)
      : normalizeExecApprovals({ version: 1, agents: {} });
  return {
    path: filePath,
    exists: true,
    raw,
    file,
    hash: hashExecApprovalsRaw(raw),
  };
}

export function loadExecApprovals(): ExecApprovalsFile {
  const filePath = resolveExecApprovalsPath();
  try {
    if (!fs.existsSync(filePath)) {
      return normalizeExecApprovals({ version: 1, agents: {} });
    }
    const raw = fs.readFileSync(filePath, "utf8");
    const parsed = JSON.parse(raw) as ExecApprovalsFile;
    if (parsed?.version !== 1) {
      return normalizeExecApprovals({ version: 1, agents: {} });
    }
    return normalizeExecApprovals(parsed);
  } catch {
    return normalizeExecApprovals({ version: 1, agents: {} });
  }
}

export function saveExecApprovals(file: ExecApprovalsFile) {
  const filePath = resolveExecApprovalsPath();
  ensureDir(filePath);
  fs.writeFileSync(filePath, `${JSON.stringify(file, null, 2)}\n`, { mode: 0o600 });
  try {
    fs.chmodSync(filePath, 0o600);
  } catch {
    // best-effort on platforms without chmod
  }
}

export function ensureExecApprovals(): ExecApprovalsFile {
  const loaded = loadExecApprovals();
  const next = normalizeExecApprovals(loaded);
  const socketPath = next.socket?.path?.trim();
  const token = next.socket?.token?.trim();
  const updated: ExecApprovalsFile = {
    ...next,
    socket: {
      path: socketPath && socketPath.length > 0 ? socketPath : resolveExecApprovalsSocketPath(),
      token: token && token.length > 0 ? token : generateToken(),
    },
  };
  saveExecApprovals(updated);
  return updated;
}

function normalizeSecurity(value: ExecSecurity | undefined, fallback: ExecSecurity): ExecSecurity {
  if (value === "allowlist" || value === "full" || value === "deny") {
    return value;
  }
  return fallback;
}

function normalizeAsk(value: ExecAsk | undefined, fallback: ExecAsk): ExecAsk {
  if (value === "always" || value === "off" || value === "on-miss") {
    return value;
  }
  return fallback;
}

export type ExecApprovalsDefaultOverrides = {
  security?: ExecSecurity;
  ask?: ExecAsk;
  askFallback?: ExecSecurity;
  autoAllowSkills?: boolean;
};

export function resolveExecApprovals(
  agentId?: string,
  overrides?: ExecApprovalsDefaultOverrides,
): ExecApprovalsResolved {
  const file = ensureExecApprovals();
  return resolveExecApprovalsFromFile({
    file,
    agentId,
    overrides,
    path: resolveExecApprovalsPath(),
    socketPath: expandHome(file.socket?.path ?? resolveExecApprovalsSocketPath()),
    token: file.socket?.token ?? "",
  });
}

export function resolveExecApprovalsFromFile(params: {
  file: ExecApprovalsFile;
  agentId?: string;
  overrides?: ExecApprovalsDefaultOverrides;
  path?: string;
  socketPath?: string;
  token?: string;
}): ExecApprovalsResolved {
  const file = normalizeExecApprovals(params.file);
  const defaults = file.defaults ?? {};
  const agentKey = params.agentId ?? DEFAULT_AGENT_ID;
  const agent = file.agents?.[agentKey] ?? {};
  const wildcard = file.agents?.["*"] ?? {};
  const fallbackSecurity = params.overrides?.security ?? DEFAULT_SECURITY;
  const fallbackAsk = params.overrides?.ask ?? DEFAULT_ASK;
  const fallbackAskFallback = params.overrides?.askFallback ?? DEFAULT_ASK_FALLBACK;
  const fallbackAutoAllowSkills = params.overrides?.autoAllowSkills ?? DEFAULT_AUTO_ALLOW_SKILLS;
  const resolvedDefaults: Required<ExecApprovalsDefaults> = {
    security: normalizeSecurity(defaults.security, fallbackSecurity),
    ask: normalizeAsk(defaults.ask, fallbackAsk),
    askFallback: normalizeSecurity(
      defaults.askFallback ?? fallbackAskFallback,
      fallbackAskFallback,
    ),
    autoAllowSkills: Boolean(defaults.autoAllowSkills ?? fallbackAutoAllowSkills),
  };
  const resolvedAgent: Required<ExecApprovalsDefaults> = {
    security: normalizeSecurity(
      agent.security ?? wildcard.security ?? resolvedDefaults.security,
      resolvedDefaults.security,
    ),
    ask: normalizeAsk(agent.ask ?? wildcard.ask ?? resolvedDefaults.ask, resolvedDefaults.ask),
    askFallback: normalizeSecurity(
      agent.askFallback ?? wildcard.askFallback ?? resolvedDefaults.askFallback,
      resolvedDefaults.askFallback,
    ),
    autoAllowSkills: Boolean(
      agent.autoAllowSkills ?? wildcard.autoAllowSkills ?? resolvedDefaults.autoAllowSkills,
    ),
  };
  const allowlist = [
    ...(Array.isArray(wildcard.allowlist) ? wildcard.allowlist : []),
    ...(Array.isArray(agent.allowlist) ? agent.allowlist : []),
  ];
  return {
    path: params.path ?? resolveExecApprovalsPath(),
    socketPath: expandHome(
      params.socketPath ?? file.socket?.path ?? resolveExecApprovalsSocketPath(),
    ),
    token: params.token ?? file.socket?.token ?? "",
    defaults: resolvedDefaults,
    agent: resolvedAgent,
    allowlist,
    file,
  };
}

export function requiresExecApproval(params: {
  ask: ExecAsk;
  security: ExecSecurity;
  analysisOk: boolean;
  allowlistSatisfied: boolean;
}): boolean {
  return (
    params.ask === "always" ||
    (params.ask === "on-miss" &&
      params.security === "allowlist" &&
      (!params.analysisOk || !params.allowlistSatisfied))
  );
}

export function recordAllowlistUse(
  approvals: ExecApprovalsFile,
  agentId: string | undefined,
  entry: ExecAllowlistEntry,
  command: string,
  resolvedPath?: string,
) {
  const target = agentId ?? DEFAULT_AGENT_ID;
  const agents = approvals.agents ?? {};
  const existing = agents[target] ?? {};
  const allowlist = Array.isArray(existing.allowlist) ? existing.allowlist : [];
  const nextAllowlist = allowlist.map((item) =>
    item.pattern === entry.pattern
      ? {
          ...item,
          id: item.id ?? crypto.randomUUID(),
          lastUsedAt: Date.now(),
          lastUsedCommand: command,
          lastResolvedPath: resolvedPath,
        }
      : item,
  );
  agents[target] = { ...existing, allowlist: nextAllowlist };
  approvals.agents = agents;
  saveExecApprovals(approvals);
}

export function addAllowlistEntry(
  approvals: ExecApprovalsFile,
  agentId: string | undefined,
  pattern: string,
) {
  const target = agentId ?? DEFAULT_AGENT_ID;
  const agents = approvals.agents ?? {};
  const existing = agents[target] ?? {};
  const allowlist = Array.isArray(existing.allowlist) ? existing.allowlist : [];
  const trimmed = pattern.trim();
  if (!trimmed) {
    return;
  }
  if (allowlist.some((entry) => entry.pattern === trimmed)) {
    return;
  }
  allowlist.push({ id: crypto.randomUUID(), pattern: trimmed, lastUsedAt: Date.now() });
  agents[target] = { ...existing, allowlist };
  approvals.agents = agents;
  saveExecApprovals(approvals);
}

export function minSecurity(a: ExecSecurity, b: ExecSecurity): ExecSecurity {
  const order: Record<ExecSecurity, number> = { deny: 0, allowlist: 1, full: 2 };
  return order[a] <= order[b] ? a : b;
}

export function maxAsk(a: ExecAsk, b: ExecAsk): ExecAsk {
  const order: Record<ExecAsk, number> = { off: 0, "on-miss": 1, always: 2 };
  return order[a] >= order[b] ? a : b;
}

export type ExecApprovalDecision = "allow-once" | "allow-always" | "deny";

export async function requestExecApprovalViaSocket(params: {
  socketPath: string;
  token: string;
  request: Record<string, unknown>;
  timeoutMs?: number;
}): Promise<ExecApprovalDecision | null> {
  const { socketPath, token, request } = params;
  if (!socketPath || !token) {
    return null;
  }
  const timeoutMs = params.timeoutMs ?? 15_000;
  const payload = JSON.stringify({
    type: "request",
    token,
    id: crypto.randomUUID(),
    request,
  });

  return await requestJsonlSocket({
    socketPath,
    payload,
    timeoutMs,
    accept: (value) => {
      const msg = value as { type?: string; decision?: ExecApprovalDecision };
      if (msg?.type === "decision" && msg.decision) {
        return msg.decision;
      }
      return undefined;
    },
  });
}
