/**
 * AGC Cocos Creator 插件运行时入口。
 *
 * 宿主以插件目录为 cwd 用系统 `node` 启动本文件，stdio 上使用一行一个 JSON-RPC
 * 2.0 消息（`agc.plugin.v1`）。入口只做注册与转发：命令、能力、面板通过通用宿主
 * 注册，编辑器操作经 `host.rpc` 路由到插件包自带 native 适配器。
 *
 * 说明：通用 SDK `@genarrative/agc-plugin-sdk` 目前以 TypeScript 源码分发，而运行
 * 入口必须能被系统 node 直接执行，因此这里内联同一份 stdio 协议实现；package.json
 * 仍声明 SDK 版本依赖，测试会校验协议常量、方法名与 native 适配器一致。
 */

import { createInterface } from 'node:readline';
import { pathToFileURL } from 'node:url';

import {
  buildEditorRpcRequest,
  COCOS_EDITOR_OPERATIONS,
  validateExecuteCode,
} from './cocos-editor-adapter.mjs';
import {
  buildCocosOperationCode,
  COCOS_EDITOR_OPERATIONS as COCOS_OPERATION_NAMES,
} from './cocos-editor-operations.mjs';

export const COCOS_PLUGIN_PROTOCOL_VERSION = 'agc.plugin.v1';
export const COCOS_EXECUTE_COMMAND_ID = 'cocos.editor.execute';
export const COCOS_OPERATION_COMMAND_ID = 'cocos.editor.operation';
export const COCOS_CONNECTION_CAPABILITY_ID = 'cocos.editor.connection';
export const COCOS_EDITOR_PANEL = Object.freeze({
  id: 'cocos-editor',
  title: 'Cocos Creator',
  entry: './panels/cocos-editor.html',
  placement: 'sidebar',
});
export const PROJECT_CHANGED_EVENT = 'project.changed';

// 默认执行可先安装桥接；覆盖 15 秒引导、最长 60 秒命令和发现开销，早于宿主 90 秒截止。
const RPC_TIMEOUT_MS = 85_000;

export function createCocosEditorPlugin({
  send,
  log = () => undefined,
  timeoutMs = RPC_TIMEOUT_MS,
}) {
  let nextId = 1;
  let activeProjectPath = null;
  let disposed = false;
  let executionUncertain = false;
  let executionPending = false;
  const pending = new Map();

  const handlers = new Map([
    [COCOS_EXECUTE_COMMAND_ID, handleExecute],
    [COCOS_OPERATION_COMMAND_ID, handleOperation],
    [COCOS_CONNECTION_CAPABILITY_ID, handleConnection],
  ]);

  function request(method, params) {
    const id = nextId++;
    return new Promise((resolve, reject) => {
      const timer = setTimeout(() => {
        pending.delete(id);
        reject(new Error(`插件宿主 RPC 超时：${method}`));
      }, timeoutMs);
      pending.set(id, { resolve, reject, timer });
      send({ jsonrpc: '2.0', id, method, params });
    });
  }

  function respond(id, result, error) {
    if (error) {
      send({
        jsonrpc: '2.0',
        id,
        error: { code: -32603, message: error },
      });
      return;
    }
    send({ jsonrpc: '2.0', id, result: result ?? null });
  }

  function resolveProjectPath(params) {
    const explicit = params?.projectPath;
    if (typeof explicit === 'string' && explicit) return explicit;
    if (activeProjectPath) return activeProjectPath;
    throw new Error('当前没有受控项目路径，宿主需先设置项目上下文');
  }

  async function callEditor(operation, params) {
    const { method, params: editorParams } = buildEditorRpcRequest(
      operation,
      params,
    );
    return request('host.rpc', { method, params: editorParams });
  }

  async function handleExecute(params) {
    const code = params?.code;
    validateExecuteCode(code);
    const projectPath = resolveProjectPath(params);
    const reconcile = (response) => ({
      status: 'needs-reconciliation',
      retryAllowed: false,
      response,
    });
    if (executionUncertain)
      return reconcile({ ok: false, error: '先前执行结果待核对' });
    // 不积压稍后执行的 mutation，避免调用方超时后请求仍从队列发出。
    if (executionPending)
      return {
        status: 'failed',
        retryAllowed: false,
        response: {
          ok: false,
          error: '已有 Cocos execute 正在执行，请等待回执',
        },
      };
    executionPending = true;
    try {
      const response = await callEditor('execute', {
        projectPath,
        code,
        timeoutMs: params?.timeoutMs,
      });
      if (response?.status === 'needs-reconciliation') {
        executionUncertain = true;
        return reconcile(response);
      }
      if (typeof response?.ok !== 'boolean')
        throw new Error('宿主缺少可信执行回执');
      return { status: response.ok ? 'completed' : 'failed', response };
    } catch (error) {
      // 已交给宿主的 execute 超时/断线不能推断为未执行。
      executionUncertain = true;
      return reconcile({ ok: false, error: error.message });
    } finally {
      executionPending = false;
    }
  }

  async function handleConnection(params) {
    const operation = params?.operation ?? 'detect';
    if (!COCOS_EDITOR_OPERATIONS.includes(operation)) {
      throw new Error(`不支持的能力操作：${operation}`);
    }
    if (operation === 'execute') return handleExecute(params);
    if (operation === 'disconnect') {
      return callEditor('disconnect', {});
    }
    return callEditor(operation, {
      projectPath: resolveProjectPath(params),
      processId: params?.processId,
      timeoutMs: params?.timeoutMs,
      payloadPath: params?.payloadPath,
    });
  }

  async function handleOperation(params) {
    const operation = params?.operation;
    if (!COCOS_OPERATION_NAMES.includes(operation)) {
      throw new Error(`不支持的 Cocos 操作：${operation}`);
    }
    const projectPath = resolveProjectPath(params);
    const result = await handleExecute({
      projectPath,
      code: buildCocosOperationCode(operation, params?.args ?? {}),
      timeoutMs: 60_000,
    });
    const status = result?.response?.result?.status;
    if (status === 'failed' || status === 'needs-reconciliation') {
      result.status = status;
      if (status === 'needs-reconciliation') {
        executionUncertain = true;
        result.retryAllowed = false;
      }
    }
    return result;
  }

  async function handleMessage(message) {
    if (disposed) return;
    const envelope =
      typeof message === 'string' ? JSON.parse(message) : message;
    if (!envelope || envelope.jsonrpc !== '2.0') return;

    if (envelope.method === 'host.event') {
      const event = envelope.params ?? {};
      if (event.type === PROJECT_CHANGED_EVENT) {
        const projectPath = event.payload?.projectPath;
        activeProjectPath =
          typeof projectPath === 'string' && projectPath ? projectPath : null;
      }
      return;
    }

    if (envelope.method !== undefined) {
      if (envelope.id === undefined) return;
      const handler = handlers.get(envelope.method);
      if (!handler) {
        respond(envelope.id, undefined, `插件未注册方法：${envelope.method}`);
        return;
      }
      try {
        respond(envelope.id, await handler(envelope.params ?? {}));
      } catch (error) {
        log(`cocos plugin 处理 ${envelope.method} 失败：${error.message}`);
        respond(envelope.id, undefined, error.message);
      }
      return;
    }

    const request = pending.get(envelope.id);
    if (!request) return;
    pending.delete(envelope.id);
    clearTimeout(request.timer);
    if (envelope.error) {
      request.reject(new Error(envelope.error.message ?? '插件宿主 RPC 失败'));
      return;
    }
    request.resolve(envelope.result);
  }

  async function start() {
    const command = await request('host.registerCommand', {
      id: COCOS_EXECUTE_COMMAND_ID,
      title: '在 Cocos Creator 中执行代码',
      description: '在已打开的 Cocos Creator 项目中执行受控 JavaScript 函数体',
    });
    const capability = await request('host.registerCapability', {
      id: COCOS_CONNECTION_CAPABILITY_ID,
      description: 'Cocos Creator 连接探测、目标预检、ping、status 与注入',
    });
    const operations = await request('host.registerCommand', {
      id: COCOS_OPERATION_COMMAND_ID,
      title: '调用 Cocos Creator 编辑器能力',
      description: `调用内置 Cocos 编辑器操作（${COCOS_OPERATION_NAMES.join(', ')}）`,
    });
    const panel = await request('host.registerPanel', {
      ...COCOS_EDITOR_PANEL,
    });
    const subscription = await request('host.events.subscribe', {
      type: PROJECT_CHANGED_EVENT,
    });
    activeProjectPath = subscription?.projectPath ?? null;
    return {
      command,
      capability,
      operations,
      panel,
      subscriptionId: subscription?.subscriptionId ?? null,
    };
  }

  function dispose() {
    disposed = true;
    for (const request of pending.values()) {
      clearTimeout(request.timer);
      request.reject(new Error('插件已停止'));
    }
    pending.clear();
  }

  return {
    start,
    handleMessage,
    dispose,
    get activeProjectPath() {
      return activeProjectPath;
    },
  };
}

export function startCocosEditorStdioPlugin({
  stdin = process.stdin,
  stdout = process.stdout,
  log = (message) => process.stderr.write(`${message}\n`),
} = {}) {
  const plugin = createCocosEditorPlugin({
    send: (message) => stdout.write(`${JSON.stringify(message)}\n`),
    log,
  });
  const lines = createInterface({ input: stdin, crlfDelay: Infinity });
  lines.on('line', (line) => {
    const trimmed = line.trim();
    if (!trimmed) return;
    void plugin.handleMessage(trimmed).catch((error) => {
      log(`cocos plugin 消息处理失败：${error.message}`);
    });
  });
  void plugin.start().catch((error) => {
    log(`cocos plugin 注册失败：${error.message}`);
  });
  return plugin;
}

const entryPoint = process.argv[1];
if (entryPoint && import.meta.url === pathToFileURL(entryPoint).href) {
  startCocosEditorStdioPlugin();
}