import { useAppConfig } from '@vben/hooks';
import { useAccessStore } from '@vben/stores';

import { pyRequestClient } from '#/api/request';

export interface CubeReportScope {
  canRefreshMetadata: boolean;
  companies: Array<{ id: string; name: string }>;
}

export interface CubeReportMetaStatus {
  available: boolean;
  changed?: boolean;
  cubeCount: number;
  memberCount: number;
  refreshedAt: null | string;
  refreshing: boolean;
  stale: boolean;
}

export interface CubeReportAppParameters {
  fileUpload: Record<string, unknown>;
  openingStatement: string;
  suggestedQuestions: string[];
  suggestedQuestionsAfterAnswer: { enabled: boolean };
  systemParameters: Record<string, unknown>;
  userInputForm: Array<Record<string, unknown>>;
}

export interface CubeReportSession {
  createdAt: null | string;
  hasData?: boolean;
  id: string;
  reportId?: null | string;
  tenantId: string;
  tenantName: string;
  title: string;
  updatedAt: null | string;
}

export interface CubeReportSessionPage {
  hasMore: boolean;
  items: CubeReportSession[];
  nextCursor: null | string;
}

export interface CubeSavedReport {
  conversationId: string;
  createdAt: null | string;
  id: string;
  limitSource: 'system' | 'user';
  message: string;
  query: Record<string, unknown>;
  requirement: string;
  tenantId: string;
  tenantName: string;
  title: string;
  updatedAt: null | string;
}

export interface CubeSavedReportPage {
  items: CubeSavedReport[];
  page: number;
  pageSize: number;
  total: number;
}

export interface CubeReportFile {
  belongsTo?: 'assistant' | 'user';
  id: string;
  name: string;
  type: string;
}

export interface CubeReportMessage {
  content: string;
  createdAt: null | string;
  difyMessageId: null | string;
  files: CubeReportFile[];
  id: string;
  role: 'assistant' | 'user';
  status: 'completed' | 'failed' | 'streaming';
}

export interface CubeReportColumn {
  key: string;
  title: string;
  type: string;
}

export interface CubeReportPage {
  columns: CubeReportColumn[];
  limitSource?: 'system' | 'user';
  page: number;
  pageSize: number;
  rows: Array<Record<string, unknown>>;
  sql?: string;
  title?: string;
  total: number;
}

export interface CubeReportExportResult {
  bucketName: string;
  filename: string;
  objectName: string;
  rowCount: number;
  sheetCount: number;
  url: string;
}

export type CubeReportStreamEvent =
  | { content: string; type: 'message_delta' | 'message_replace' }
  | {
      conversationId?: string;
      hasData: boolean;
      type: 'complete';
    }
  | { message: string; type: 'error' }
  | { taskId: string; type: 'task' }
  | { text: string; type: 'status' };

export interface SendCubeReportMessage {
  content: string;
  conversationId?: null | string;
  files: CubeReportFile[];
  tenantId?: string;
  tenantName?: string;
}

function getFetchConfig() {
  const { pyApiURL } = useAppConfig(import.meta.env, import.meta.env.PROD);
  const accessStore = useAccessStore();
  return {
    baseURL: pyApiURL.replace(/\/$/, ''),
    authorization: accessStore.accessToken
      ? `Bearer ${accessStore.accessToken}`
      : '',
  };
}

async function authorizedFetch(path: string, init: RequestInit) {
  const request = () => {
    const { authorization, baseURL } = getFetchConfig();
    const headers = new Headers(init.headers);
    if (authorization) {
      headers.set('Authorization', authorization);
    } else {
      headers.delete('Authorization');
    }
    return fetch(`${baseURL}${path}`, { ...init, headers });
  };

  let response = await request();
  if (response.status !== 401) return response;

  try {
    // 标准请求客户端会使用项目现有的 refresh token 机制更新令牌。
    await getCubeReportScope();
  } catch {
    return response;
  }
  await response.body?.cancel();
  response = await request();
  return response;
}

async function responseError(response: Response) {
  const text = await response.text();
  try {
    const payload = JSON.parse(text) as { detail?: string; message?: string };
    return payload.detail || payload.message || text;
  } catch {
    return text || `请求失败（${response.status}）`;
  }
}

export async function getCubeReportScope() {
  return pyRequestClient.get<CubeReportScope>('/llm/cube-report/scope');
}

export async function getCubeReportMetaStatus() {
  return pyRequestClient.get<CubeReportMetaStatus>(
    '/llm/cube-report/meta/status',
  );
}

export async function refreshCubeReportMeta() {
  return pyRequestClient.post<CubeReportMetaStatus>(
    '/llm/cube-report/meta/refresh',
  );
}

export async function getCubeReportAppParameters() {
  return pyRequestClient.get<CubeReportAppParameters>(
    '/llm/cube-report/app-parameters',
  );
}

export async function getCubeReportSessions(params: {
  cursor?: string;
  keyword?: string;
  pageSize?: number;
  tenantId: string;
}) {
  return pyRequestClient.get<CubeReportSessionPage>(
    '/llm/cube-report/sessions',
    { params },
  );
}

export async function getCubeReports(params: {
  keyword?: string;
  page: number;
  pageSize: number;
  tenantId: string;
}) {
  return pyRequestClient.get<CubeSavedReportPage>('/llm/cube-report/reports', {
    params,
  });
}

export async function getCubeReport(id: string) {
  return pyRequestClient.get<CubeSavedReport>(`/llm/cube-report/reports/${id}`);
}

export async function getCubeReportSession(id: string) {
  return pyRequestClient.get<{
    messages: CubeReportMessage[];
    session: CubeReportSession;
  }>(`/llm/cube-report/sessions/${id}`);
}

export async function getCubeReportData(id: string, params: { page: number }) {
  return pyRequestClient.get<CubeReportPage>(
    `/llm/cube-report/sessions/${id}/data`,
    { params },
  );
}

export async function getCubeSavedReportData(
  id: string,
  params: { page: number },
) {
  return pyRequestClient.get<CubeReportPage>(
    `/llm/cube-report/reports/${id}/data`,
    { params },
  );
}

export async function exportCubeReportSession(id: string) {
  return pyRequestClient.post<CubeReportExportResult>(
    `/llm/cube-report/sessions/${id}/export`,
  );
}

export async function exportCubeSavedReport(id: string) {
  return pyRequestClient.post<CubeReportExportResult>(
    `/llm/cube-report/reports/${id}/export`,
  );
}

export async function favoriteCubeReportSession(id: string) {
  return pyRequestClient.post<CubeSavedReport>(
    `/llm/cube-report/sessions/${id}/favorite`,
  );
}

export async function renameCubeReportSession(id: string, name: string) {
  return pyRequestClient.post<CubeReportSession>(
    `/llm/cube-report/sessions/${id}/name`,
    { name },
  );
}

export async function deleteCubeReportSession(id: string) {
  return pyRequestClient.delete<{ result: string }>(
    `/llm/cube-report/sessions/${id}`,
  );
}

export async function renameCubeSavedReport(id: string, name: string) {
  return pyRequestClient.post<CubeSavedReport>(
    `/llm/cube-report/reports/${id}/name`,
    { name },
  );
}

export async function deleteCubeSavedReport(id: string) {
  return pyRequestClient.delete<{ result: string }>(
    `/llm/cube-report/reports/${id}`,
  );
}

export async function stopCubeReportTask(taskId: string) {
  return pyRequestClient.post<{ result: string }>(
    `/llm/cube-report/tasks/${taskId}/stop`,
  );
}

export async function uploadCubeReportFile(file: File) {
  const form = new FormData();
  form.append('file', file);
  const response = await authorizedFetch('/llm/cube-report/files/upload', {
    method: 'POST',
    body: form,
  });
  if (!response.ok) throw new Error(await responseError(response));
  const payload = (await response.json()) as {
    data: CubeReportFile;
  };
  return payload.data;
}

export async function downloadCubeReportFile(
  conversationId: string,
  file: CubeReportFile,
) {
  const params = new URLSearchParams({
    conversationId,
    asAttachment: 'true',
  });
  const response = await authorizedFetch(
    `/llm/cube-report/files/${file.id}/preview?${params}`,
    {},
  );
  if (!response.ok) throw new Error(await responseError(response));
  const blob = await response.blob();
  const url = URL.createObjectURL(blob);
  const anchor = document.createElement('a');
  anchor.href = url;
  anchor.download = file.name;
  anchor.click();
  URL.revokeObjectURL(url);
}

export async function streamCubeReportMessage(
  payload: SendCubeReportMessage,
  onEvent: (event: CubeReportStreamEvent) => void,
) {
  const response = await authorizedFetch('/llm/cube-report/messages/stream', {
    method: 'POST',
    headers: {
      Accept: 'text/event-stream',
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(payload),
  });

  if (!response.ok) throw new Error(await responseError(response));
  if (!response.body) throw new Error('当前浏览器不支持流式响应');

  const reader = response.body.getReader();
  const decoder = new TextDecoder('utf-8');
  let buffer = '';
  const consumePacket = (packet: string) => {
    const data = packet
      .split(/\r?\n/)
      .filter((line) => line.startsWith('data: '))
      .map((line) => line.slice(6))
      .join('\n');
    if (data) onEvent(JSON.parse(data) as CubeReportStreamEvent);
  };

  while (true) {
    const { done, value } = await reader.read();
    buffer += decoder.decode(value, { stream: !done });
    const packets = buffer.split(/\r?\n\r?\n/);
    buffer = packets.pop() ?? '';
    packets.forEach((packet) => consumePacket(packet));
    if (done) break;
  }
  if (buffer.trim()) consumePacket(buffer);
}