import { shell } from 'electron';
import { logger } from 'ee-core/log';
import { registerArtifactRoot } from '../service/codex/codexArtifactService';
import { getCodexHome, getSkillsDir, isInsideDir } from '../service/codex/codexHome';
import { probeCodexBinary } from '../service/codex/codexLocator';
import {
  applyProvider as applyProviderToRuntime,
  baseUrlHint,
  clearProvider as clearRuntimeProvider,
  describeDroppedKeys,
  probeEndpoint,
} from '../service/codex/providerService';
import {
  defaultWorkspaceDir,
  getAppliedProvider,
  getCodex,
  setAppliedProvider,
  tailDiagnostics,
  toStatusResult,
} from '../service/codex/index';
import {
  asMessage,
  fail,
  ok,
  type ApprovalAnswers,
  type ApprovalDecision,
  type ApplyProviderInput,
  type CodexPingResult,
  type CodexStatusResult,
  type Rpc,
} from '../service/codex/types';
import type { ModelOption } from '../service/codex/codexRuntime';
import type { McpServerInput, McpServerSetting } from '../service/codex/mcpService';
import type { SkillListItem, SkillReadResult } from '../service/codex/skillService';
import type { AgentEvent } from '../service/codex/types';

const APPROVAL_DECISIONS: readonly ApprovalDecision[] = ['accept', 'acceptForSession', 'decline', 'cancel'];

/** 统一的异常包装：ee-core 的 ipcMain.handle 不 catch，抛错会被 Electron 包成 "Error occurred in handler for ..." */
async function guard<T>(label: string, run: () => Promise<T>): Promise<Rpc<T>> {
  try {
    return ok(await run());
  } catch (error) {
    const message = asMessage(error);
    logger.error(`[codexCtl] ${label} failed:`, message);
    return fail(message);
  }
}

function requireString(value: unknown, label: string): string {
  if (typeof value !== 'string' || !value.trim()) throw new Error(`${label} 不能为空`);
  return value.trim();
}

/** Codex 的「线程不在本进程里」只以这句错误文本出现，是识别失效线程的唯一依据 */
function isThreadMissingError(error: unknown): boolean {
  return /thread not found/iu.test(error instanceof Error ? error.message : String(error));
}

function toBytes(value: unknown): Uint8Array {
  if (value instanceof Uint8Array) return value;
  if (value instanceof ArrayBuffer) return new Uint8Array(value);
  if (Array.isArray(value)) return new Uint8Array(value as number[]);
  if (value && typeof value === 'object' && 'data' in value) {
    return toBytes((value as { data: unknown }).data);
  }
  throw new Error('文件内容必须是二进制数据');
}

class CodexCtl {
  /** 只探测二进制与 CODEX_HOME，不 spawn 子进程 */
  async ping(): Promise<Rpc<CodexPingResult>> {
    return guard('ping', async () => {
      // getCodex() 会顺带建好 CODEX_HOME 与 skills 目录
      await getCodex();
      const probe = await probeCodexBinary();
      return { ...probe, codexHome: getCodexHome() };
    });
  }

  async status(): Promise<Rpc<CodexStatusResult>> {
    return guard('status', async () => {
      const { runtime } = await getCodex();
      await getAppliedProvider();
      return toStatusResult(runtime.status);
    });
  }

  async start(): Promise<Rpc<CodexStatusResult>> {
    return guard('start', async () => {
      const { runtime } = await getCodex();
      await getAppliedProvider();
      return toStatusResult(await runtime.start());
    });
  }

  async stop(): Promise<Rpc<CodexStatusResult>> {
    return guard('stop', async () => {
      const { runtime } = await getCodex();
      await runtime.stop();
      return toStatusResult(runtime.status);
    });
  }

  async restart(): Promise<Rpc<CodexStatusResult>> {
    return guard('restart', async () => {
      const { runtime } = await getCodex();
      await runtime.stop();
      await getAppliedProvider();
      return toStatusResult(await runtime.start());
    });
  }

  async listModels(): Promise<Rpc<ModelOption[]>> {
    return guard('listModels', async () => {
      const { runtime } = await getCodex();
      return runtime.listModels();
    });
  }

  async providerCapabilities(): Promise<Rpc<unknown>> {
    return guard('providerCapabilities', async () => {
      const { runtime } = await getCodex();
      return runtime.readModelProviderCapabilities();
    });
  }

  /** 只做端点探测，不改运行时；页面在「应用」前给用户预览兼容性 */
  async probeProvider(params: {
    baseUrl?: string;
    apiKey?: string | null;
    modelId?: string | null;
  }): Promise<Rpc<unknown>> {
    return guard('probeProvider', async () => {
      const baseUrl = requireString(params?.baseUrl, 'baseUrl');
      const result = await probeEndpoint({
        baseUrl,
        modelId: params?.modelId ?? null,
        apiKey: params?.apiKey ?? null,
      });
      return { ...result, hint: baseUrlHint(baseUrl) };
    });
  }

  /** 应用后端「模型管理」里的一条记录；会重启子进程（api key 走环境变量） */
  async applyProvider(params: ApplyProviderInput & { modelRecordId?: string | number | null }): Promise<Rpc<unknown>> {
    return guard('applyProvider', async () => {
      if (!params || typeof params !== 'object') throw new Error('缺少模型配置');
      const { runtime } = await getCodex();
      const applied = await applyProviderToRuntime(runtime, params);
      setAppliedProvider(applied);
      return {
        applied,
        hint: baseUrlHint(applied.baseUrl),
        droppedConfigKeys: describeDroppedKeys(params),
        status: toStatusResult(runtime.status),
      };
    });
  }

  async clearProvider(): Promise<Rpc<CodexStatusResult>> {
    return guard('clearProvider', async () => {
      const { runtime } = await getCodex();
      await clearRuntimeProvider(runtime);
      setAppliedProvider(null);
      return toStatusResult(runtime.status);
    });
  }

  async mcpList(): Promise<Rpc<McpServerSetting[]>> {
    return guard('mcpList', async () => (await getCodex()).mcp.list());
  }

  async mcpSave(params: McpServerInput): Promise<Rpc<McpServerSetting[]>> {
    return guard('mcpSave', async () => (await getCodex()).mcp.save(params));
  }

  async mcpRemove(params: { id?: string }): Promise<Rpc<McpServerSetting[]>> {
    return guard('mcpRemove', async () =>
      (await getCodex()).mcp.remove(requireString(params?.id, 'id')),
    );
  }

  async skillList(params?: { forceReload?: boolean }): Promise<Rpc<SkillListItem[]>> {
    return guard('skillList', async () =>
      (await getCodex()).skills.list({ forceReload: params?.forceReload === true }),
    );
  }

  async skillRead(params: { path?: string; name?: string }): Promise<Rpc<SkillReadResult>> {
    return guard('skillRead', async () => (await getCodex()).skills.read(params ?? {}));
  }

  async skillInstallFolder(params: {
    srcPath?: string;
    name?: string | null;
    overwrite?: boolean;
  }): Promise<Rpc<SkillListItem[]>> {
    return guard('skillInstallFolder', async () =>
      (await getCodex()).skills.installFromFolder(requireString(params?.srcPath, 'srcPath'), {
        name: params?.name ?? null,
        overwrite: params?.overwrite === true,
      }),
    );
  }

  async skillInstallZip(params: {
    data?: unknown;
    name?: string | null;
    overwrite?: boolean;
  }): Promise<Rpc<SkillListItem[]>> {
    return guard('skillInstallZip', async () =>
      (await getCodex()).skills.installFromZip(toBytes(params?.data), {
        name: params?.name ?? null,
        overwrite: params?.overwrite === true,
      }),
    );
  }

  async skillRemove(params: { path?: string; name?: string }): Promise<Rpc<SkillListItem[]>> {
    return guard('skillRemove', async () => (await getCodex()).skills.remove(params ?? {}));
  }

  async skillSetEnabled(params: {
    path?: string;
    name?: string;
    enabled?: boolean;
  }): Promise<Rpc<{ effectiveEnabled: boolean }>> {
    return guard('skillSetEnabled', async () => {
      if (typeof params?.enabled !== 'boolean') throw new Error('enabled 必须是布尔值');
      const effectiveEnabled = await (await getCodex()).skills.setEnabled(params, params.enabled);
      return { effectiveEnabled };
    });
  }

  /** 只允许打开用户 skills 目录或其中的某个 skill */
  async skillOpenFolder(params?: { path?: string }): Promise<Rpc<{ path: string }>> {
    return guard('skillOpenFolder', async () => {
      const skillsDir = getSkillsDir();
      const target = params?.path ? params.path : skillsDir;
      if (!isInsideDir(skillsDir, target) && target !== skillsDir) {
        throw new Error('只能打开 skills 目录内的路径');
      }
      const result = await shell.openPath(target);
      if (result) throw new Error(result);
      return { path: target };
    });
  }

  /** 会话默认工作目录（渲染进程也需要知道真实值，产物栏要与 cwd 对齐） */
  async defaultWorkspace(): Promise<Rpc<{ cwd: string }>> {
    return guard('defaultWorkspace', async () => ({ cwd: await defaultWorkspaceDir() }));
  }

  async threadStart(params?: {
    cwd?: string | null;
    model?: string | null;
    approvalPolicy?: 'untrusted' | 'on-request' | 'never';
    sandbox?: 'read-only' | 'workspace-write' | 'danger-full-access';
  }): Promise<Rpc<{ threadId: string; cwd: string }>> {
    return guard('threadStart', async () => {
      const { runtime } = await getCodex();
      const cwd = params?.cwd?.trim() || (await defaultWorkspaceDir());
      const threadId = await runtime.startThread({
        cwd,
        model: params?.model ?? null,
        approvalPolicy: params?.approvalPolicy ?? 'never',
        sandbox: params?.sandbox ?? 'workspace-write',
      });
      // 登记产物白名单：产物读写只允许发生在会话工作目录内
      registerArtifactRoot(cwd);
      return { threadId, cwd };
    });
  }

  /** 跑一整轮并等结果；事件流同时通过 codex/event 推给渲染进程 */
  async turnRun(params: {
    threadId?: string;
    input?: string;
    cwd?: string | null;
    model?: string | null;
    approvalPolicy?: 'untrusted' | 'on-request' | 'never';
    timeoutMs?: number;
  }): Promise<Rpc<{ turnId: string; status: string; text: string }>> {
    return guard('turnRun', async () => {
      const { runtime } = await getCodex();
      const threadId = requireString(params?.threadId, 'threadId');
      const cwd = params?.cwd?.trim() || undefined;
      if (cwd) registerArtifactRoot(cwd);
      const options = {
        threadId,
        prompt: requireString(params?.input, 'input'),
        cwd,
        model: params?.model ?? null,
        approvalPolicy: params?.approvalPolicy ?? ('never' as const),
        timeoutMs: typeof params?.timeoutMs === 'number' ? params.timeoutMs : undefined,
      };
      try {
        const result = await runtime.runTurn(options);
        return { turnId: result.turnId, status: result.status, text: result.text };
      } catch (error: unknown) {
        // 线程只存在于当前 app-server 进程里：换模型或重启应用后旧 threadId 必然认不出，
        // 先按 Codex 落盘的历史把它救回来（thread/resume），再重发这一轮
        if (!isThreadMissingError(error)) throw error;
        try {
          await runtime.resumeThread(threadId, {
            cwd: cwd || (await defaultWorkspaceDir()),
            model: options.model,
            approvalPolicy: options.approvalPolicy,
          });
        } catch {
          // 从没成功跑完过一轮的线程 Codex 根本没落盘，救不回来
          throw new Error('该会话的 Codex 线程已失效（中途换过模型或重启过应用），请新建会话继续');
        }
        const retried = await runtime.runTurn(options);
        return { turnId: retried.turnId, status: retried.status, text: retried.text };
      }
    });
  }

  async turnInterrupt(params: { threadId?: string; turnId?: string }): Promise<Rpc<Record<string, never>>> {
    return guard('turnInterrupt', async () => {
      const { runtime } = await getCodex();
      await runtime.interruptTurn(requireString(params?.threadId, 'threadId'), requireString(params?.turnId, 'turnId'));
      return {};
    });
  }

  async threadUnsubscribe(params: { threadId?: string }): Promise<Rpc<Record<string, never>>> {
    return guard('threadUnsubscribe', async () => {
      const { runtime } = await getCodex();
      await runtime.unsubscribeThread(requireString(params?.threadId, 'threadId'));
      return {};
    });
  }

  async approvalResolve(params: {
    token?: string;
    decision?: ApprovalDecision;
    answers?: ApprovalAnswers;
  }): Promise<Rpc<Record<string, never>>> {
    return guard('approvalResolve', async () => {
      const { broker } = await getCodex();
      const token = requireString(params?.token, 'token');
      const decision = params?.decision;
      if (!decision || !APPROVAL_DECISIONS.includes(decision)) throw new Error('decision 不合法');
      broker.resolve(token, decision, params?.answers);
      return {};
    });
  }

  /** 读回某个 thread 已落盘的事件（页面刷新后恢复现场） */
  async eventsRead(params: { threadId?: string; limit?: number }): Promise<Rpc<AgentEvent[]>> {
    return guard('eventsRead', async () => {
      const { eventLog } = await getCodex();
      const threadId = requireString(params?.threadId, 'threadId');
      return eventLog.read(threadId, typeof params?.limit === 'number' ? params.limit : undefined);
    });
  }

  async logsTail(params?: { limit?: number }): Promise<Rpc<Array<{ ts: string; line: string }>>> {
    return guard('logsTail', async () =>
      tailDiagnostics(typeof params?.limit === 'number' ? params.limit : undefined),
    );
  }
}

CodexCtl.toString = () => 'CodexCtl';
export default CodexCtl;