/**
 * EJClaw Codex Runner
 *
 * App-server only runtime.
 *
 * Input protocol:
 *   Stdin: Full RunnerInput JSON (read until EOF)
 *   IPC:   Follow-up messages as JSON files in $EJCLAW_IPC_DIR/input/
 *          Sentinel: _close — signals session end
 *
 * Stdout protocol:
 *   Each result is wrapped in OUTPUT_START_MARKER / OUTPUT_END_MARKER pairs.
 */

import fs from 'fs';
import path from 'path';

import {
  EJCLAW_ENV,
  IPC_CLOSE_SENTINEL,
  IPC_INPUT_SUBDIR,
  IPC_POLL_MS,
  normalizeAgentOutput,
  writeProtocolOutput,
  type RunnerStructuredOutput,
} from 'ejclaw-runners-shared';

import { CodexAppServerClient } from './app-server-client.js';
import { parseAppServerInput } from './app-server-input.js';
import {
  prependRoomRoleHeader,
  type RoomRoleContext,
} from './room-role-context.js';
import {
  assertReadonlyWorkspaceRepoConnectivity,
  buildReviewerGitGuardEnv,
  isArbiterRuntimeEnvEnabled,
  isReviewerRuntime,
  isReviewerRuntimeEnvEnabled,
} from './reviewer-runtime.js';

// ── Types ──────────────────────────────────────────────────────────

interface RunnerInput {
  prompt: string;
  sessionId?: string;
  groupFolder: string;
  chatJid: string;
  isMain: boolean;
  isScheduledTask?: boolean;
  assistantName?: string;
  agentType?: string;
  codexGoals?: boolean;
  roomRoleContext?: RoomRoleContext;
}

interface RunnerOutput {
  status: 'success' | 'error';
  result: string | null;
  output?: RunnerStructuredOutput;
  phase?: 'progress' | 'final';
  newSessionId?: string;
  error?: string;
  compaction?: {
    completed: boolean;
    trigger?: string | null;
  };
}

// ── Constants ──────────────────────────────────────────────────────

const GROUP_DIR = process.env[EJCLAW_ENV.groupDir] || '/workspace/group';
const IPC_DIR = process.env[EJCLAW_ENV.ipcDir] || '/workspace/ipc';
const WORK_DIR = process.env[EJCLAW_ENV.workDir] || '';
const IPC_INPUT_DIR = path.join(IPC_DIR, IPC_INPUT_SUBDIR);
const IPC_INPUT_CLOSE_SENTINEL = path.join(IPC_INPUT_DIR, IPC_CLOSE_SENTINEL);

const EFFECTIVE_CWD = WORK_DIR || GROUP_DIR;
const CODEX_MODEL = process.env.CODEX_MODEL || '';
const CODEX_EFFORT = process.env.CODEX_EFFORT || '';

let closeRequested = false;

// ── Helpers ────────────────────────────────────────────────────────

function writeOutput(output: RunnerOutput): void {
  writeProtocolOutput(output);
}

function compactionOutput(
  completed: boolean | undefined,
): Pick<RunnerOutput, 'compaction'> {
  return completed ? { compaction: { completed: true, trigger: null } } : {};
}

function normalizeStructuredOutput(result: string | null): {
  result: string | null;
  output?: RunnerOutput['output'];
} {
  return normalizeAgentOutput(result);
}

function log(message: string): void {
  console.error(`[codex-runner] ${message}`);
}

function isCodexGoalsEnabled(runnerInput: RunnerInput): boolean {
  return runnerInput.codexGoals === true || process.env.CODEX_GOALS === 'true';
}

async function readStdin(): Promise<string> {
  return new Promise((resolve, reject) => {
    let data = '';
    process.stdin.setEncoding('utf8');
    process.stdin.on('data', (chunk: string) => {
      data += chunk;
    });
    process.stdin.on('end', () => resolve(data));
    process.stdin.on('error', reject);
  });
}

function consumeCloseSentinel(): boolean {
  if (closeRequested) return true;
  if (!fs.existsSync(IPC_INPUT_CLOSE_SENTINEL)) return false;

  try {
    fs.unlinkSync(IPC_INPUT_CLOSE_SENTINEL);
  } catch {
    /* ignore */
  }
  closeRequested = true;
  return true;
}

function drainIpcInput(): string[] {
  try {
    fs.mkdirSync(IPC_INPUT_DIR, { recursive: true });
    const files = fs
      .readdirSync(IPC_INPUT_DIR)
      .filter((file) => file.endsWith('.json'))
      .sort();

    const messages: string[] = [];
    for (const file of files) {
      const filePath = path.join(IPC_INPUT_DIR, file);
      try {
        const data = JSON.parse(fs.readFileSync(filePath, 'utf-8'));
        fs.unlinkSync(filePath);
        if (data.type === 'message' && data.text) {
          messages.push(data.text);
        }
      } catch (err) {
        log(
          `Failed to process input file ${file}: ${
            err instanceof Error ? err.message : String(err)
          }`,
        );
        try {
          fs.unlinkSync(filePath);
        } catch {
          /* ignore */
        }
      }
    }
    return messages;
  } catch (err) {
    log(`IPC drain error: ${err instanceof Error ? err.message : String(err)}`);
    return [];
  }
}

function formatProgressElapsed(ms: number): string {
  const elapsedSeconds = Math.floor(ms / 10_000) * 10;
  const hours = Math.floor(elapsedSeconds / 3600);
  const minutes = Math.floor((elapsedSeconds % 3600) / 60);
  const seconds = elapsedSeconds % 60;
  const parts: string[] = [];

  if (hours > 0) parts.push(`${hours}시간`);
  if (minutes > 0) parts.push(`${minutes}분`);
  parts.push(`${seconds}초`);

  return parts.join(' ');
}

async function executeAppServerTurn(
  client: CodexAppServerClient,
  threadId: string,
  prompt: string,
  retryCount = 0,
): Promise<{
  result: string | null;
  error?: string;
  compactionCompleted?: boolean;
}> {
  let lastProgressMessage: string | null = null;
  const activeTurn = await client.startTurn(
    threadId,
    parseAppServerInput(prompt, log),
    {
      cwd: EFFECTIVE_CWD,
      model: CODEX_MODEL || undefined,
      effort: CODEX_EFFORT || undefined,
      onProgress: (message) => {
        const trimmed = message.trim();
        if (!trimmed || trimmed === lastProgressMessage) {
          return;
        }
        lastProgressMessage = trimmed;
        writeOutput({
          status: 'success',
          phase: 'progress',
          ...normalizeStructuredOutput(trimmed),
          newSessionId: threadId,
        });
      },
    },
  );

  let elapsedMs = 0;
  let polling = true;
  const pollDuringTurn = async () => {
    if (!polling) return;

    if (consumeCloseSentinel()) {
      log('Close sentinel detected during app-server turn, interrupting');
      polling = false;
      try {
        await activeTurn.interrupt();
      } catch (err) {
        log(
          `Failed to interrupt active turn: ${
            err instanceof Error ? err.message : String(err)
          }`,
        );
      }
      return;
    }

    const messages = drainIpcInput();
    if (messages.length > 0) {
      const merged = messages.join('\n');
      log(`Steering active turn with ${messages.length} queued message(s)`);
      try {
        await activeTurn.steer(parseAppServerInput(merged, log));
      } catch (err) {
        log(
          `turn/steer failed: ${err instanceof Error ? err.message : String(err)}`,
        );
      }
    }

    elapsedMs += IPC_POLL_MS;
    if (elapsedMs > 0 && elapsedMs % 60000 === 0) {
      log(`Turn in progress... (${formatProgressElapsed(elapsedMs)})`);
    }
    setTimeout(() => void pollDuringTurn(), IPC_POLL_MS);
  };

  setTimeout(() => void pollDuringTurn(), IPC_POLL_MS);

  try {
    const { state, result } = await activeTurn.wait();
    if (state.status === 'completed') {
      return { result, compactionCompleted: state.compactionCompleted };
    }
    if (state.status === 'interrupted' && consumeCloseSentinel()) {
      return { result, compactionCompleted: state.compactionCompleted };
    }
    if (state.status === 'interrupted' && retryCount < 1) {
      log('Codex turn interrupted, retrying once...');
      return executeAppServerTurn(client, threadId, prompt, retryCount + 1);
    }
    return {
      result,
      error:
        state.errorMessage || `Codex turn finished with status ${state.status}`,
      compactionCompleted: state.compactionCompleted,
    };
  } finally {
    polling = false;
  }
}

async function runAppServerCompact(
  client: CodexAppServerClient,
  threadId: string | undefined,
): Promise<void> {
  if (!threadId) {
    writeOutput({
      status: 'success',
      result: '현재 활성 Codex 세션이 없어 compact를 건너뜁니다.',
    });
    return;
  }

  const { state } = await client.startCompaction(threadId);
  if (state.status === 'failed') {
    writeOutput({
      status: 'error',
      result: null,
      newSessionId: threadId,
      error: state.errorMessage || 'Conversation compaction failed.',
      ...compactionOutput(state.compactionCompleted),
    });
    return;
  }

  writeOutput({
    status: 'success',
    result: state.compactionCompleted
      ? 'Conversation compacted.'
      : 'Compaction requested but contextCompaction was not observed.',
    newSessionId: threadId,
    ...compactionOutput(state.compactionCompleted),
  });
}

async function runAppServerSession(
  runnerInput: RunnerInput,
  prompt: string,
): Promise<void> {
  const reviewerRuntime =
    isReviewerRuntimeEnvEnabled(process.env) ||
    isReviewerRuntime(runnerInput.roomRoleContext);
  const readonlyRuntime =
    reviewerRuntime || isArbiterRuntimeEnvEnabled(process.env);
  const clientEnv = buildReviewerGitGuardEnv(process.env, reviewerRuntime);
  assertReadonlyWorkspaceRepoConnectivity(clientEnv, readonlyRuntime);
  const client = new CodexAppServerClient({
    cwd: EFFECTIVE_CWD,
    env: clientEnv,
    log,
    enableGoals: isCodexGoalsEnabled(runnerInput),
  });

  await client.start();

  let threadId: string | undefined;
  try {
    try {
      threadId = await client.startOrResumeThread(runnerInput.sessionId, {
        cwd: EFFECTIVE_CWD,
        model: CODEX_MODEL || undefined,
      });
      log(
        runnerInput.sessionId
          ? `App-server thread resumed (${threadId})`
          : `App-server thread started (${threadId})`,
      );
    } catch (err) {
      if (!runnerInput.sessionId) throw err;
      log(
        `App-server resume failed, retrying with new thread: ${
          err instanceof Error ? err.message : String(err)
        }`,
      );
      threadId = await client.startOrResumeThread(undefined, {
        cwd: EFFECTIVE_CWD,
        model: CODEX_MODEL || undefined,
      });
      log(`App-server thread restarted (${threadId})`);
    }

    const trimmedPrompt = prompt.trim();
    if (trimmedPrompt === '/compact') {
      await runAppServerCompact(client, threadId);
      return;
    }

    log('Starting app-server turn...');
    const { result, error, compactionCompleted } = await executeAppServerTurn(
      client,
      threadId,
      prompt,
    );

    if (error) {
      const normalized = normalizeStructuredOutput(result || null);
      log(`App-server turn error: ${error}`);
      writeOutput({
        status: 'error',
        ...normalized,
        newSessionId: threadId,
        error,
        ...compactionOutput(compactionCompleted),
      });
    } else {
      const normalized = normalizeStructuredOutput(result || null);
      writeOutput({
        status: 'success',
        ...normalized,
        ...(result ? { phase: 'final' as const } : {}),
        newSessionId: threadId,
        ...compactionOutput(compactionCompleted),
      });
    }

    if (consumeCloseSentinel()) {
      log('Close sentinel detected, exiting app-server runtime');
    }
  } finally {
    await client.close();
  }
}

// ── Main ──────────────────────────────────────────────────────────

async function main(): Promise<void> {
  let runnerInput: RunnerInput;

  try {
    const stdinData = await readStdin();
    runnerInput = JSON.parse(stdinData);
    try {
      fs.unlinkSync('/tmp/input.json');
    } catch {
      /* may not exist */
    }
    log(`Received input for group: ${runnerInput.groupFolder}`);
  } catch (err) {
    writeOutput({
      status: 'error',
      result: null,
      error: `Failed to parse input: ${
        err instanceof Error ? err.message : String(err)
      }`,
    });
    process.exit(1);
  }

  fs.mkdirSync(IPC_INPUT_DIR, { recursive: true });
  closeRequested = false;
  try {
    fs.unlinkSync(IPC_INPUT_CLOSE_SENTINEL);
  } catch {
    /* ignore */
  }

  const rawPrompt = runnerInput.prompt;
  let prompt = rawPrompt;
  if (runnerInput.isScheduledTask) {
    prompt = `[SCHEDULED TASK]\n\n${prompt}`;
  }
  const pending = drainIpcInput();
  if (pending.length > 0) {
    prompt += '\n' + pending.join('\n');
  }
  // Prepend room role header AFTER checking for session commands,
  // so /compact is not masked by the header prefix.
  const isSessionCommand = rawPrompt.trim() === '/compact';
  if (!isSessionCommand) {
    prompt = prependRoomRoleHeader(prompt, runnerInput.roomRoleContext);
  }

  try {
    log('Runtime selected: app-server');
    await runAppServerSession(runnerInput, prompt);
  } catch (err) {
    const errorMessage = err instanceof Error ? err.message : String(err);
    log(`Runner error: ${errorMessage}`);
    writeOutput({
      status: 'error',
      result: null,
      error: errorMessage,
    });
  }
}

main();