import { exec } from 'node:child_process';
import { once } from 'node:events';
import { existsSync } from 'node:fs';
import { createServer } from 'node:net';
import { join } from 'node:path';
import { app, utilityProcess } from 'electron';
import logManager from '@electron/service/logger';
import { getOpenClawDir, getOpenClawEntryPath } from '@electron/utils/paths';
import { prependPathEntry } from '@electron/utils/env-path';
import { getUvMirrorEnv } from '@electron/utils/uv-env';
import { isPythonReady, setupManagedPython } from '@electron/utils/uv-setup';
import type { GatewayProcessHandle } from './process-handle';
import { probeGatewayReady } from './ws-client';

export function warmupManagedPythonReadiness(): void {
  void isPythonReady()
    .then((pythonReady) => {
      if (!pythonReady) {
        logManager.info('Python environment missing or incomplete, attempting background repair...');
        void setupManagedPython().catch((error) => {
          logManager.error('Background Python repair failed:', error);
        });
      }
    })
    .catch((error) => {
      logManager.error('Failed to check Python environment:', error);
    });
}

async function getListeningProcessIds(port: number): Promise<string[]> {
  const command = process.platform === 'win32'
    ? `netstat -ano | findstr :${port}`
    : `lsof -i :${port} -sTCP:LISTEN -t`;

  const stdout = await new Promise<string>((resolve) => {
    exec(command, { timeout: 5000, windowsHide: true }, (error, result) => {
      if (error) {
        resolve('');
        return;
      }
      resolve(result);
    });
  });

  if (!stdout.trim()) {
    return [];
  }

  if (process.platform === 'win32') {
    const pids: string[] = [];
    for (const line of stdout.trim().split(/\r?\n/)) {
      const parts = line.trim().split(/\s+/);
      if (parts.length >= 5 && parts[3] === 'LISTENING') {
        pids.push(parts[4]);
      }
    }
    return [...new Set(pids)];
  }

  return [...new Set(stdout.trim().split(/\r?\n/).map((value) => value.trim()).filter(Boolean))];
}

async function terminateOrphanedProcessIds(port: number, pids: string[]): Promise<void> {
  logManager.warn(`Found orphaned Gateway listener on port ${port}; terminating PIDs: ${pids.join(', ')}`);

  for (const pid of pids) {
    try {
      if (process.platform === 'win32') {
        await new Promise<void>((resolve) => {
          exec(
            `taskkill /F /PID ${pid} /T`,
            { timeout: 5000, windowsHide: true },
            () => resolve(),
          );
        });
        continue;
      }

      process.kill(Number.parseInt(pid, 10), 'SIGTERM');
    } catch {
      // ignore already-exited processes
    }
  }

  await new Promise((resolve) => setTimeout(resolve, process.platform === 'win32' ? 1500 : 1000));
}

export async function terminateOwnedGatewayProcess(child: GatewayProcessHandle): Promise<void> {
  const pid = child.pid;

  await new Promise<void>((resolve) => {
    let exited = false;
    let timeout: NodeJS.Timeout | null = null;

    child.once('exit', () => {
      exited = true;
      if (timeout) {
        clearTimeout(timeout);
      }
      resolve();
    });

    logManager.info(`Sending kill to Gateway process (pid=${pid ?? 'unknown'})`);

    if (process.platform === 'win32' && pid) {
      exec(`taskkill /F /PID ${pid} /T`, { timeout: 5000, windowsHide: true }, () => {
        if (!exited) {
          resolve();
        }
      });
      return;
    }

    try {
      child.kill();
    } catch {
      resolve();
    }

    timeout = setTimeout(() => {
      if (!exited) {
        logManager.warn(`Gateway did not exit in time, force-killing (pid=${pid ?? 'unknown'})`);
        if (pid) {
          if (process.platform === 'win32') {
            exec(`taskkill /F /PID ${pid} /T`, { timeout: 5000, windowsHide: true }, () => {
              resolve();
            });
            return;
          }

          try {
            process.kill(pid, 'SIGKILL');
          } catch {
            // ignore
          }
        }
      }
      resolve();
    }, 5000);
  });
}

export async function unloadLaunchctlGatewayService(): Promise<void> {
  if (process.platform !== 'darwin') {
    return;
  }

  try {
    const uid = process.getuid?.();
    if (uid === undefined) {
      return;
    }

    const launchdLabel = 'ai.openclaw.gateway';
    const serviceTarget = `gui/${uid}/${launchdLabel}`;

    const loaded = await new Promise<boolean>((resolve) => {
      exec(`launchctl print ${serviceTarget}`, { timeout: 5000 }, (error) => {
        resolve(!error);
      });
    });

    if (!loaded) {
      return;
    }

    logManager.info(`Unloading launchctl service ${serviceTarget} to prevent auto-respawn`);
    await new Promise<void>((resolve) => {
      exec(`launchctl bootout ${serviceTarget}`, { timeout: 10000 }, (error) => {
        if (error) {
          logManager.warn(`Failed to bootout launchctl service: ${error.message}`);
        } else {
          logManager.info('Successfully unloaded launchctl gateway service');
        }
        resolve();
      });
    });
  } catch (error) {
    logManager.warn('Error while unloading launchctl gateway service:', error);
  }
}

async function canListenOnPort(port: number): Promise<boolean> {
  const server = createServer();
  try {
    server.listen(port, '127.0.0.1');
    await once(server, 'listening');
    return true;
  } catch {
    return false;
  } finally {
    try {
      server.close();
    } catch {
      // ignore
    }
  }
}

export async function waitForPortFree(
  port: number,
  timeoutMs = 30_000,
  intervalMs = 500,
): Promise<void> {
  const startAt = Date.now();
  let logged = false;

  while (Date.now() - startAt < timeoutMs) {
    if (await canListenOnPort(port)) {
      const elapsed = Date.now() - startAt;
      if (elapsed > intervalMs) {
        logManager.info(`Port ${port} became available after ${elapsed}ms`);
      }
      return;
    }

    if (!logged) {
      logManager.info(`Waiting for port ${port} to become available (Windows TCP TIME_WAIT)...`);
      logged = true;
    }
    await new Promise((resolve) => setTimeout(resolve, intervalMs));
  }

  logManager.error(`Port ${port} still occupied after ${timeoutMs}ms; aborting startup to avoid port conflict`);
  throw new Error(`Port ${port} still occupied after ${timeoutMs}ms`);
}

export async function findExistingGatewayProcess(options: {
  port: number;
  ownedPid?: number | null;
}): Promise<{ port: number; externalToken?: string } | null> {
  try {
    const pids = await getListeningProcessIds(options.port);
    if (pids.length > 0 && (!options.ownedPid || !pids.includes(String(options.ownedPid)))) {
      await terminateOrphanedProcessIds(options.port, pids);
      if (process.platform === 'win32') {
        await waitForPortFree(options.port, 10_000);
      }
      return null;
    }

    const ready = await probeGatewayReady(options.port, 5_000);
    return ready ? { port: options.port } : null;
  } catch {
    return null;
  }
}

export async function runOpenClawDoctorRepair(): Promise<boolean> {
  const openclawDir = getOpenClawDir();
  const entryScript = getOpenClawEntryPath();
  if (!existsSync(entryScript)) {
    logManager.error(`Cannot run OpenClaw doctor repair: entry script not found at ${entryScript}`);
    return false;
  }

  const platform = process.platform;
  const arch = process.arch;
  const target = `${platform}-${arch}`;
  const binPath = app.isPackaged
    ? join(process.resourcesPath, 'bin')
    : join(process.cwd(), 'resources', 'bin', target);
  const binPathExists = existsSync(binPath);
  const baseProcessEnv = process.env as Record<string, string | undefined>;
  const baseEnvPatched = binPathExists
    ? prependPathEntry(baseProcessEnv, binPath).env
    : baseProcessEnv;
  const uvEnv = await getUvMirrorEnv();
  const doctorArgs = ['doctor', '--fix', '--yes', '--non-interactive'];

  logManager.info(
    `Running OpenClaw doctor repair (entry="${entryScript}", args="${doctorArgs.join(' ')}", cwd="${openclawDir}", bundledBin=${binPathExists ? 'yes' : 'no'})`,
  );

  return await new Promise<boolean>((resolve) => {
    const forkEnv: Record<string, string | undefined> = {
      ...baseEnvPatched,
      ...uvEnv,
      OPENCLAW_NO_RESPAWN: '1',
    };

    const child = utilityProcess.fork(entryScript, doctorArgs, {
      cwd: openclawDir,
      stdio: 'pipe',
      env: forkEnv as NodeJS.ProcessEnv,
    });

    let settled = false;
    const finish = (ok: boolean) => {
      if (settled) return;
      settled = true;
      resolve(ok);
    };

    const timeout = setTimeout(() => {
      logManager.error('OpenClaw doctor repair timed out after 120000ms');
      try {
        child.kill();
      } catch {
        // ignore
      }
      finish(false);
    }, 120000);

    child.on('error', (error) => {
      clearTimeout(timeout);
      logManager.error('Failed to spawn OpenClaw doctor repair process:', error);
      finish(false);
    });

    child.stdout?.on('data', (data) => {
      const raw = data.toString();
      for (const line of raw.split(/\r?\n/)) {
        const normalized = line.trim();
        if (!normalized) continue;
        logManager.debug(`[Gateway doctor stdout] ${normalized}`);
      }
    });

    child.stderr?.on('data', (data) => {
      const raw = data.toString();
      for (const line of raw.split(/\r?\n/)) {
        const normalized = line.trim();
        if (!normalized) continue;
        logManager.warn(`[Gateway doctor stderr] ${normalized}`);
      }
    });

    child.on('exit', (code) => {
      clearTimeout(timeout);
      if (code === 0) {
        logManager.info('OpenClaw doctor repair completed successfully');
        finish(true);
        return;
      }
      logManager.warn(`OpenClaw doctor repair exited (code=${code})`);
      finish(false);
    });
  });
}