import { fallbackErrorClass } from '../api/chatRetry';
import type { ChatErrorInfo } from '../types/workbench';

/** GET /api/v1/tasks/runs/{id} 的最小视图。兼容修复前的 PascalCase 响应。 */
export type RemoteTaskRunView = {
  status?: string;
  Status?: string;
  error_message?: string;
  ErrorMessage?: string;
  workspace_id?: string;
  WorkspaceID?: string;
};

export function readRemoteTaskRun(remote: RemoteTaskRunView | null | undefined): {
  status: string;
  errorMessage: string;
  workspaceId: string;
} {
  if (!remote) {
    return { status: '', errorMessage: '', workspaceId: '' };
  }
  return {
    status: remote.status || remote.Status || '',
    errorMessage: (remote.error_message || remote.ErrorMessage || '').trim(),
    workspaceId: remote.workspace_id || remote.WorkspaceID || '',
  };
}

const fatalDenialCopy: Record<string, string> = {
  DOC_TASK_DISABLED: '该文档任务未启用，当前请求未执行',
  WORKFLOW_NOT_ACTIVATED: '当前项目尚未激活工作流，文档任务不会启动',
  WORKFLOW_INSTANCE_CLOSED: '工作流实例已关闭，无法执行该文档任务',
  DOC_DUTY_NOT_MANAGED: '该文档未配置职责，无法执行',
  SESSION_FORBIDDEN: '无权访问该会话',
  TASK_SCOPE_UNRESOLVED: '无法定位该文档任务的工作流阶段，请检查任务名或联系管理员',
};

/** 任务直通道失败后应降级到聊天确认引导的错误码（仅降级一次，防循环）。 */
export function isTaskStageDegradeCode(code: string | undefined | null): boolean {
  return code === 'TASK_SCOPE_UNRESOLVED' || code === 'DOC_TASK_NOT_IN_ACTIVE_STAGE';
}

export function buildNetworkErrorInfo(
  httpStatus?: number,
  opts?: { errorCode?: string; detail?: string },
): ChatErrorInfo {
  const code = opts?.errorCode || '';
  const detail = opts?.detail || '';
  if (code === 'DOC_BUSY' || code === 'document_busy') {
    return {
      userMessage: detail || '该文档正在被其他用户或项目助手编辑，当前请求未创建新任务',
      code: 'DOC_BUSY',
      class: 'fatal',
      actions: [],
    };
  }
  if (code === 'DOC_TASK_NOT_IN_ACTIVE_STAGE') {
    return {
      userMessage: detail || '该文档任务不在当前活动阶段，请先完成当前阶段工作流后再试',
      code,
      class: 'transient',
      actions: ['retry'],
    };
  }
  if (code === 'DOC_DUTY_FORBIDDEN') {
    return {
      userMessage: detail || '当前账号不是该文档任务的职责人，无法执行',
      code,
      class: 'fatal',
      actions: ['retry'],
    };
  }
  if (fatalDenialCopy[code]) {
	const retryable = code === 'WORKFLOW_NOT_ACTIVATED' || code === 'DOC_DUTY_NOT_MANAGED' || code === 'TASK_SCOPE_UNRESOLVED';
    return {
      userMessage: detail || fatalDenialCopy[code],
      code,
      class: 'fatal',
      actions: retryable ? ['retry'] : [],
    };
  }
  if (httpStatus === 401) {
    return {
      userMessage: '登录已失效，请重新登录后再试',
      code: 'ERR_UNAUTHENTICATED',
      class: 'fatal',
      actions: ['retry'],
    };
  }
  if (httpStatus === 403) {
    if (code === 'ERR_FORBIDDEN' || code === 'AUTHZ') {
      return {
        userMessage: detail || '无权访问该项目，请确认登录账号与项目成员身份',
        code: code || 'ERR_FORBIDDEN',
        class: 'fatal',
        actions: ['retry'],
      };
    }
    return {
      userMessage: detail || '无权执行该操作，请确认账号权限与工作流阶段',
      code: code || 'ERR_FORBIDDEN',
      class: 'fatal',
      actions: ['retry'],
    };
  }
  if (httpStatus !== undefined && httpStatus >= 400 && httpStatus < 500) {
    const shown = code || `HTTP_${httpStatus}`;
    return {
      userMessage: detail || `请求失败（${shown}），请重试或联系管理员`,
      code: shown,
      class: 'fatal',
      actions: ['retry'],
    };
  }
  return {
    userMessage: '网络连接异常，请检查网络后重试',
    code: 'NETWORK_ERROR',
    class: fallbackErrorClass({ network: true }),
    actions: ['retry'],
  };
}

/** interrupted 且有工作区时可继续；否则只允许按原请求重开。 */
export function buildInterruptedTaskErrorInfo(errorMessage: string, workspaceId: string): ChatErrorInfo {
  const message = errorMessage.trim() || '任务执行中断，可继续或重新开始';
  const resumable = workspaceId.trim() !== '';
  return {
    userMessage: message,
    code: 'TASK_INTERRUPTED',
    class: resumable ? 'resumable' : 'fatal',
    workspaceId: resumable ? workspaceId : undefined,
    actions: resumable ? ['continue', 'restart'] : ['restart'],
  };
}

/** 服务端已判定 failed：有 error_message 时展示真实原因，否则才回落到网络错误。 */
export function buildFailedTaskErrorInfo(errorMessage: string): ChatErrorInfo {
  const message = errorMessage.trim();
  if (!message) {
    return buildNetworkErrorInfo();
  }
  return {
    userMessage: message,
    code: 'TASK_FAILED',
    class: 'fatal',
    actions: ['retry', 'restart'],
  };
}

export function buildCancelledTaskErrorInfo(): ChatErrorInfo {
  return {
    userMessage: '任务已取消',
    code: 'TASK_CANCELLED',
    class: 'cancelled',
    actions: ['restart'],
  };
}