import {
  resolveGatewayLaunchAgentLabel,
  resolveGatewaySystemdServiceName,
  resolveGatewayWindowsTaskName,
} from "../../daemon/constants.js";
import { resolveGatewayLogPaths } from "../../daemon/launchd.js";
import { getResolvedLoggerSettings } from "../../logging.js";

export function parsePort(raw: unknown): number | null {
  if (raw === undefined || raw === null) return null;
  const value =
    typeof raw === "string"
      ? raw
      : typeof raw === "number" || typeof raw === "bigint"
        ? raw.toString()
        : null;
  if (value === null) return null;
  const parsed = Number.parseInt(value, 10);
  if (!Number.isFinite(parsed) || parsed <= 0) return null;
  return parsed;
}

export function parsePortFromArgs(programArguments: string[] | undefined): number | null {
  if (!programArguments?.length) return null;
  for (let i = 0; i < programArguments.length; i += 1) {
    const arg = programArguments[i];
    if (arg === "--port") {
      const next = programArguments[i + 1];
      const parsed = parsePort(next);
      if (parsed) return parsed;
    }
    if (arg?.startsWith("--port=")) {
      const parsed = parsePort(arg.split("=", 2)[1]);
      if (parsed) return parsed;
    }
  }
  return null;
}

export function pickProbeHostForBind(
  bindMode: string,
  tailnetIPv4: string | undefined,
  customBindHost?: string,
) {
  if (bindMode === "custom" && customBindHost?.trim()) {
    return customBindHost.trim();
  }
  if (bindMode === "auto") return tailnetIPv4 ?? "127.0.0.1";
  return "127.0.0.1";
}

export function safeDaemonEnv(env: Record<string, string> | undefined): string[] {
  if (!env) return [];
  const allow = [
    "CLAWDBOT_PROFILE",
    "CLAWDBOT_STATE_DIR",
    "CLAWDBOT_CONFIG_PATH",
    "CLAWDBOT_GATEWAY_PORT",
    "CLAWDBOT_NIX_MODE",
  ];
  const lines: string[] = [];
  for (const key of allow) {
    const value = env[key];
    if (!value?.trim()) continue;
    lines.push(`${key}=${value.trim()}`);
  }
  return lines;
}

export function normalizeListenerAddress(raw: string): string {
  let value = raw.trim();
  if (!value) return value;
  value = value.replace(/^TCP\s+/i, "");
  value = value.replace(/\s+\(LISTEN\)\s*$/i, "");
  return value.trim();
}

export function formatRuntimeStatus(
  runtime:
    | {
        status?: string;
        state?: string;
        subState?: string;
        pid?: number;
        lastExitStatus?: number;
        lastExitReason?: string;
        lastRunResult?: string;
        lastRunTime?: string;
        detail?: string;
      }
    | undefined,
) {
  if (!runtime) return null;
  const status = runtime.status ?? "unknown";
  const details: string[] = [];
  if (runtime.pid) details.push(`pid ${runtime.pid}`);
  if (runtime.state && runtime.state.toLowerCase() !== status) {
    details.push(`state ${runtime.state}`);
  }
  if (runtime.subState) details.push(`sub ${runtime.subState}`);
  if (runtime.lastExitStatus !== undefined) {
    details.push(`last exit ${runtime.lastExitStatus}`);
  }
  if (runtime.lastExitReason) details.push(`reason ${runtime.lastExitReason}`);
  if (runtime.lastRunResult) details.push(`last run ${runtime.lastRunResult}`);
  if (runtime.lastRunTime) details.push(`last run time ${runtime.lastRunTime}`);
  if (runtime.detail) details.push(runtime.detail);
  return details.length > 0 ? `${status} (${details.join(", ")})` : status;
}

export function renderRuntimeHints(
  runtime: { missingUnit?: boolean; status?: string } | undefined,
  env: NodeJS.ProcessEnv = process.env,
): string[] {
  if (!runtime) return [];
  const hints: string[] = [];
  const fileLog = (() => {
    try {
      return getResolvedLoggerSettings().file;
    } catch {
      return null;
    }
  })();
  if (runtime.missingUnit) {
    hints.push("Service not installed. Run: clawdbot daemon install");
    if (fileLog) hints.push(`File logs: ${fileLog}`);
    return hints;
  }
  if (runtime.status === "stopped") {
    if (fileLog) hints.push(`File logs: ${fileLog}`);
    if (process.platform === "darwin") {
      const logs = resolveGatewayLogPaths(env);
      hints.push(`Launchd stdout (if installed): ${logs.stdoutPath}`);
      hints.push(`Launchd stderr (if installed): ${logs.stderrPath}`);
    } else if (process.platform === "linux") {
      const unit = resolveGatewaySystemdServiceName(env.CLAWDBOT_PROFILE);
      hints.push(`Logs: journalctl --user -u ${unit}.service -n 200 --no-pager`);
    } else if (process.platform === "win32") {
      const task = resolveGatewayWindowsTaskName(env.CLAWDBOT_PROFILE);
      hints.push(`Logs: schtasks /Query /TN "${task}" /V /FO LIST`);
    }
  }
  return hints;
}

export function renderGatewayServiceStartHints(env: NodeJS.ProcessEnv = process.env): string[] {
  const base = ["clawdbot daemon install", "clawdbot gateway"];
  const profile = env.CLAWDBOT_PROFILE;
  switch (process.platform) {
    case "darwin": {
      const label = resolveGatewayLaunchAgentLabel(profile);
      return [...base, `launchctl bootstrap gui/$UID ~/Library/LaunchAgents/${label}.plist`];
    }
    case "linux": {
      const unit = resolveGatewaySystemdServiceName(profile);
      return [...base, `systemctl --user start ${unit}.service`];
    }
    case "win32": {
      const task = resolveGatewayWindowsTaskName(profile);
      return [...base, `schtasks /Run /TN "${task}"`];
    }
    default:
      return base;
  }
}
