#!/usr/bin/env node

import { spawn } from 'node:child_process';

import {
  callSpacetimeProcedureViaCli,
  ensureProcedureOk,
  validateSpacetimeDatabaseName,
} from '../spacetime-migration-common.mjs';

const PROCEDURE = 'rotate_editor_generation_runtime_service_identity_and_return';

function usage() {
  console.error(
    '用法: production-runtime-writer-identity-rotate.mjs --database <database> --server-url <http(s)://host:port> --operator-identity <64-hex> --operator-user-id <user-id> --next-writer-identity <64-hex> --confirm-next-writer-identity <64-hex> --note <audit-note>',
  );
}

function readValue(argv, index, name) {
  const value = argv[index + 1];
  if (!value || value.startsWith('--')) {
    throw new Error(`${name} 缺少参数值。`);
  }
  return value;
}

function normalizeIdentity(value, name) {
  const identity = value.trim().replace(/^0x/u, '').toLowerCase();
  if (!/^[0-9a-f]{64}$/u.test(identity)) {
    throw new Error(`${name} 必须是 64 位十六进制 SpacetimeDB identity。`);
  }
  return identity;
}

async function readCurrentCliIdentity() {
  const output = await new Promise((resolve, reject) => {
    const child = spawn('spacetime', ['login', 'show'], {
      shell: false,
      stdio: ['ignore', 'pipe', 'pipe'],
    });
    let text = '';
    child.stdout.on('data', (chunk) => {
      text += chunk.toString();
    });
    child.stderr.on('data', (chunk) => {
      text += chunk.toString();
    });
    child.on('error', reject);
    child.on('exit', (code, signal) => {
      if (signal) {
        reject(new Error(`spacetime login show 被信号中断: ${signal}`));
      } else if (code !== 0) {
        reject(new Error(`无法读取当前 SpacetimeDB CLI identity，退出码 ${code}`));
      } else {
        resolve(text);
      }
    });
  });
  const identities = [...output.matchAll(/\b[0-9a-f]{64}\b/giu)].map((match) =>
    match[0].toLowerCase(),
  );
  if (identities.length !== 1) {
    throw new Error('spacetime login show 未返回唯一的当前 CLI identity。');
  }
  return identities[0];
}

function parseOptions(argv) {
  const options = {
    database: '',
    serverUrl: '',
    operatorIdentity: '',
    operatorUserId: '',
    nextWriterIdentity: '',
    confirmNextWriterIdentity: '',
    note: '',
    passthrough: [],
  };

  for (let index = 0; index < argv.length; index += 1) {
    const arg = argv[index];
    if (arg === '--help' || arg === '-h') {
      usage();
      process.exit(0);
    }
    if (arg === '--database') {
      options.database = readValue(argv, index, arg);
    } else if (arg === '--server-url') {
      options.serverUrl = readValue(argv, index, arg);
    } else if (arg === '--operator-identity') {
      options.operatorIdentity = readValue(argv, index, arg);
    } else if (arg === '--operator-user-id') {
      options.operatorUserId = readValue(argv, index, arg);
    } else if (arg === '--next-writer-identity') {
      options.nextWriterIdentity = readValue(argv, index, arg);
    } else if (arg === '--confirm-next-writer-identity') {
      options.confirmNextWriterIdentity = readValue(argv, index, arg);
    } else if (arg === '--note') {
      options.note = readValue(argv, index, arg);
    } else {
      throw new Error(`未知参数: ${arg}`);
    }
    index += 1;
  }

  return options;
}

try {
  const options = parseOptions(process.argv.slice(2));
  validateSpacetimeDatabaseName(options.database);
  if (!/^https?:\/\/[A-Za-z0-9.-]+(?::[0-9]{1,5})?$/u.test(options.serverUrl)) {
    throw new Error('--server-url 必须是无路径、无查询参数的显式 http(s) URL。');
  }

  const operatorIdentity = normalizeIdentity(options.operatorIdentity, '--operator-identity');
  const nextWriterIdentity = normalizeIdentity(
    options.nextWriterIdentity,
    '--next-writer-identity',
  );
  const confirmedIdentity = normalizeIdentity(
    options.confirmNextWriterIdentity,
    '--confirm-next-writer-identity',
  );
  if (nextWriterIdentity !== confirmedIdentity) {
    throw new Error('--confirm-next-writer-identity 必须与 --next-writer-identity 完全一致。');
  }
  if (nextWriterIdentity === operatorIdentity) {
    throw new Error('runtime writer identity 不能设为 migration operator identity。');
  }

  const currentCliIdentity = await readCurrentCliIdentity();
  if (operatorIdentity !== currentCliIdentity) {
    throw new Error('--operator-identity 必须与当前 SpacetimeDB CLI 登录 identity 一致。');
  }

  const operatorUserId = options.operatorUserId.trim();
  if (!/^[A-Za-z0-9][A-Za-z0-9._:@-]{0,127}$/u.test(operatorUserId)) {
    throw new Error('--operator-user-id 格式不合法。');
  }
  const note = options.note.trim();
  if (!note || note.length > 500) {
    throw new Error('--note 必填且不能超过 500 个字符。');
  }

  const result = await callSpacetimeProcedureViaCli(
    { database: options.database, serverUrl: options.serverUrl, passthrough: [] },
    PROCEDURE,
    {
      next_writer_identity_hex: nextWriterIdentity,
      operator_user_id: operatorUserId,
      note,
    },
  );
  ensureProcedureOk(result);
  console.log(
    `[runtime-writer-identity-rotation] 已完成 identity rotation: database=${options.database}, operator_identity=${operatorIdentity}, next_writer_identity=${nextWriterIdentity}; 审计记录已写入 editor_generation_runtime_identity_rotation。`,
  );
} catch (error) {
  console.error(
    `[runtime-writer-identity-rotation] 操作失败；必须使用已授权的 migration operator CLI 登录态。${error instanceof Error ? ` ${error.message}` : String(error)}`,
  );
  process.exit(1);
}