import { clearAuthSession, getAccessToken } from '/static/portal/common/auth.js';

const ENDPOINTS = Object.freeze({
  A034: { method: 'POST', path: '/api/v1/auth/tokens', auth: false },
  V001: { method: 'POST', path: '/api/v1/visitor-tokens', auth: false, raw: true },
  C001: { method: 'POST', path: '/api/v1/conversations', idempotent: true },
  C002: { method: 'GET', path: '/api/v1/conversations/{sessionId}' },
  C003: { method: 'GET', path: '/api/v1/conversations/{sessionId}/messages' },
  C005: { method: 'POST', path: '/api/v1/conversations/{sessionId}/handover-requests', idempotent: true },
  A035: { method: 'GET', path: '/api/v1/admin/roles' },
  A036: { method: 'GET', path: '/api/v1/admin/roles/{roleCode}' },
  A037: { method: 'GET', path: '/api/v1/admin/roles/{roleCode}/permissions' },
  A038: { method: 'GET', path: '/api/v1/admin/users/{userId}/roles' },
  A039: { method: 'GET', path: '/api/v1/admin/customer-profile-candidates' },
  A040: { method: 'POST', path: '/api/v1/admin/customer-profile-candidates/{candidateId}/reviews' },
  A002: { method: 'GET', path: '/api/v1/admin/config-releases' },
  A003: { method: 'GET', path: '/api/v1/admin/config-releases/{releaseId}' },
  A004: { method: 'POST', path: '/api/v1/admin/config-releases/{releaseId}/validations', idempotent: true },
  A005: { method: 'POST', path: '/api/v1/admin/config-releases/{releaseId}/reviews', idempotent: true },
  A006: { method: 'POST', path: '/api/v1/admin/config-releases/{releaseId}/activations', idempotent: true },
  A012: { method: 'GET', path: '/api/v1/admin/model-endpoints' },
  A033: { method: 'GET', path: '/api/v1/admin/audit-records' },
  ADMIN_HANDOVERS: { method: 'GET', path: '/api/v1/admin/customer-service/handover-tickets' },
  ADMIN_HANDOVER_DETAIL: { method: 'GET', path: '/api/v1/admin/customer-service/handover-tickets/{ticketNo}' },
  ONB001: { method: 'GET', path: '/api/v1/onboarding/risk-questionnaire' },
  ONB002: { method: 'POST', path: '/api/v1/onboarding/risk-questionnaire/submissions', idempotent: true },
  R001: { method: 'POST', path: '/api/v1/agent-runs' },
  R002: { method: 'GET', path: '/api/v1/agent-runs/{runId}' },
  R003: { method: 'GET', path: '/api/v1/agent-runs/{runId}/events', stream: true },
  RK001: { method: 'GET', path: '/api/v1/risk/overview' },
  RK002: { method: 'GET', path: '/api/v1/risk/alerts' },
  RK003: { method: 'GET', path: '/api/v1/risk/alerts/{alertNo}' },
  RK004: { method: 'GET', path: '/api/v1/risk/evidence/{source}' },
  RK005: { method: 'GET', path: '/api/v1/risk/notifications' },
  RK006: { method: 'POST', path: '/api/v1/risk/alerts/scan', idempotent: true },
  RK007: { method: 'POST', path: '/api/v1/risk/alerts/{alertNo}/acknowledgements', idempotent: true },
  RK008: { method: 'POST', path: '/api/v1/risk/alerts/{alertNo}/investigations', idempotent: true },
  RK009: { method: 'POST', path: '/api/v1/risk/alerts/{alertNo}/exclusions', idempotent: true },
  RK010: { method: 'POST', path: '/api/v1/risk/alerts/{alertNo}/resolutions', idempotent: true },
  RK011: { method: 'POST', path: '/api/v1/risk/alerts/{alertNo}/escalations', idempotent: true },
  RK012: { method: 'POST', path: '/api/v1/risk/alerts/{alertNo}/evidence', formData: true },
  RK013: { method: 'POST', path: '/api/v1/risk/daily-report' },
  RK014: { method: 'POST', path: '/api/v1/risk/daily-report/stream', stream: true },
  RK015: { method: 'POST', path: '/api/v1/risk/daily-report/mail' },
  T001: { method: 'GET', path: '/api/v1/users/me/account/dashboard' },
  T002: { method: 'POST', path: '/api/v1/users/me/orders', idempotent: true },
  T003: { method: 'GET', path: '/api/v1/users/me/orders' },
  T004: { method: 'GET', path: '/api/v1/users/me/orders/{orderNo}' },
  T005: { method: 'POST', path: '/api/v1/users/me/orders/{orderNo}/cancellations', idempotent: true },
  T006: { method: 'GET', path: '/api/v1/users/me/holdings' },
  T007: { method: 'GET', path: '/api/v1/users/me/transactions' },
  T008: { method: 'GET', path: '/api/v1/users/me/transactions/{transactionNo}' },
  T009: { method: 'GET', path: '/api/v1/users/me/cash-ledger' },
  ADVISOR_PUBLISHED: { method: 'GET', path: '/api/v1/advisor/recommendations/published' },
  ADVISOR_GOAL: { method: 'GET', path: '/api/v1/advisor/investment-goals/current' },
  ADVISOR_ANALYSIS: { method: 'POST', path: '/api/v1/advisor/portfolio-analysis' },
  OFFSITE_MAILS: { method: 'GET', path: '/api/v1/offsite-fund/mails' },
  OFFSITE_MAIL: { method: 'GET', path: '/api/v1/offsite-fund/mails/{mailId}' },
  OFFSITE_MAIL_DELETE: { method: 'POST', path: '/api/v1/offsite-fund/mails/{mailId}/deletions', idempotent: true },
  OFFSITE_RECOGNITION: { method: 'GET', path: '/api/v1/offsite-fund/mails/{mailId}/recognition-fields' },
  OFFSITE_RECOGNITION_SAVE: { method: 'PUT', path: '/api/v1/offsite-fund/mails/{mailId}/recognition-fields', idempotent: true },
  OFFSITE_NL2SQL_FIELDS: { method: 'GET', path: '/api/v1/offsite-fund/documents/{taskId}/nl2sql-fields' },
  OFFSITE_NL2SQL_FIELDS_SAVE: { method: 'PUT', path: '/api/v1/offsite-fund/documents/{taskId}/nl2sql-fields', idempotent: true },
  OFFSITE_RULE_RESULTS: { method: 'GET', path: '/api/v1/offsite-fund/documents/{taskId}/rule-results' },
  OFFSITE_RULE_RECALCULATE: { method: 'POST', path: '/api/v1/offsite-fund/documents/{taskId}/rule-results/recalculations', idempotent: true },
  OFFSITE_MAILBOX: { method: 'GET', path: '/api/v1/offsite-fund/mailbox-status' },
  OFFSITE_MAILBOX_RECOVER: { method: 'POST', path: '/api/v1/offsite-fund/mailbox-status/recoveries', idempotent: true },
  OFFSITE_ATTACHMENT_FILE: { method: 'GET', path: '/api/v1/offsite-fund/attachments/{attachmentId}/file' },
  OFFSITE_CONFIRM: { method: 'POST', path: '/api/v1/offsite-fund/documents/{taskId}/confirmations', idempotent: true },
  OFFSITE_RECOGNITION_RETRY: { method: 'POST', path: '/api/v1/offsite-fund/documents/{taskId}/recognition-retries', idempotent: true },
  OFFSITE_NOTIFICATION_CREATE: { method: 'POST', path: '/api/v1/offsite-fund/documents/{taskId}/notifications', idempotent: true },
  OFFSITE_NOTIFICATION_SEND: { method: 'POST', path: '/api/v1/offsite-fund/notifications/{notificationId}/send', idempotent: true },
  OFFSITE_SETTLEMENT_RECALCULATE: { method: 'POST', path: '/api/v1/offsite-fund/settlement-statistics/recalculate', idempotent: true },
  OFFSITE_TRIGGER_NL2SQL: { method: 'POST', path: '/api/tasks/{taskId}/trigger-agent-nl2sql', idempotent: true },
  PROMOTION_CREATE: { method: 'POST', path: '/api/v1/fund-promotion-materials', idempotent: true },
  PROMOTION_TASK: { method: 'GET', path: '/api/v1/fund-promotion-materials/{taskNo}' },
  PROMOTION_INPUTS: { method: 'PUT', path: '/api/v1/fund-promotion-materials/{taskNo}/inputs', idempotent: true },
  PROMOTION_ATTACHMENT: { method: 'POST', path: '/api/v1/fund-promotion-materials/{taskNo}/attachments', formData: true, idempotent: true },
  PROMOTION_GENERATE: { method: 'POST', path: '/api/v1/fund-promotion-materials/{taskNo}/generations', idempotent: true },
  PROMOTION_CHECKS: { method: 'GET', path: '/api/v1/fund-promotion-materials/{taskNo}/compliance-checks' },
  PROMOTION_REVIEW: { method: 'POST', path: '/api/v1/fund-promotion-materials/{taskNo}/reviews', idempotent: true },
  PROMOTION_DELIVERY: { method: 'POST', path: '/api/v1/fund-promotion-materials/{taskNo}/deliveries', idempotent: true },
  AGENT_RUN_CREATE: { method: 'POST', path: '/api/v1/agent-runs', idempotent: true },
  AGENT_RUN: { method: 'GET', path: '/api/v1/agent-runs/{runId}' },
});

export class ApiError extends Error {
  constructor(message, options = {}) {
    super(message);
    this.name = 'ApiError';
    this.code = options.code || 'NETWORK_ERROR';
    this.status = options.status || 0;
    this.retryable = Boolean(options.retryable);
    this.fieldErrors = options.fieldErrors || [];
    this.traceId = options.traceId || '';
    this.payload = options.payload || null;
  }
}

function pathFor(endpoint, pathParams = {}) {
  return Object.entries(pathParams).reduce(
    (path, [key, value]) => path.replace(`{${key}}`, encodeURIComponent(String(value))),
    endpoint.path,
  );
}

function wait(milliseconds) {
  return new Promise((resolve) => window.setTimeout(resolve, milliseconds));
}

function shouldRetry(error, attempt) {
  if (attempt > 0) return false;
  return error.status >= 500 || error.status === 0 || error.retryable;
}

async function request(endpointId, options = {}) {
  const endpoint = ENDPOINTS[endpointId];
  if (!endpoint) throw new ApiError(`未注册端点 ${endpointId}`, { code: 'ENDPOINT_NOT_REGISTERED' });
  const traceId = crypto.randomUUID();
  document.documentElement.dataset.traceId = traceId;
  const query = new URLSearchParams();
  Object.entries(options.query || {}).forEach(([key, value]) => {
    if (value !== undefined && value !== null && value !== '') query.set(key, String(value));
  });
  const queryString = query.size ? `?${query.toString()}` : '';
  const headers = { Accept: 'application/json', 'X-Trace-ID': traceId, ...(options.headers || {}) };
  const token = getAccessToken();
  if (endpoint.auth !== false && token) headers.Authorization = `Bearer ${token}`;
  if (options.body !== undefined && !endpoint.formData) headers['Content-Type'] = 'application/json';
  if (endpoint.idempotent) headers['Idempotency-Key'] = options.idempotencyKey || crypto.randomUUID().replaceAll('-', '');

  for (let attempt = 0; attempt < 2; attempt += 1) {
    const controller = new AbortController();
    const abortListener = () => controller.abort();
    options.signal?.addEventListener('abort', abortListener, { once: true });
    const timeoutId = window.setTimeout(() => controller.abort(), options.timeout || 8000);
    try {
      const response = await fetch(`${pathFor(endpoint, options.pathParams)}${queryString}`, {
        method: endpoint.method,
        headers,
        body: options.body === undefined || endpoint.method === 'GET'
          ? undefined
          : (endpoint.formData ? options.body : JSON.stringify(options.body)),
        cache: 'no-store',
        signal: controller.signal,
      });
      const payload = await response.json().catch(() => ({}));
      if (response.status === 401 && endpoint.auth !== false) clearAuthSession();
      const responseTraceId = payload.meta?.trace_id || response.headers.get('X-Trace-ID') || traceId;
      document.documentElement.dataset.traceId = responseTraceId;
      const hasBusinessError = Object.prototype.hasOwnProperty.call(payload, 'code') && payload.code !== 0;
      if (!response.ok || payload.error || hasBusinessError) {
        const detail = payload.error || {};
        const validationDetail = Array.isArray(payload.detail)
          ? payload.detail
              .map((item) => item?.msg || item?.message || '')
              .filter(Boolean)
              .join('；')
          : (typeof payload.detail === 'string' ? payload.detail : '');
        const message = detail.message
          || (hasBusinessError ? payload.message : '')
          || validationDetail
          || (response.status ? `请求失败（HTTP ${response.status}）` : '请求未完成');
        const businessStatus = hasBusinessError && Number(payload.code) >= 400
          ? Number(payload.code)
          : response.status;
        const error = new ApiError(message, {
          code: detail.code || (hasBusinessError ? `BUSINESS_${payload.code}` : undefined),
          status: businessStatus,
          retryable: detail.retryable,
          fieldErrors: detail.field_errors,
          traceId: responseTraceId,
          payload,
        });
        if (response.status === 429 && attempt === 0) await wait(5000);
        else if (shouldRetry(error, attempt)) await wait(2000);
        else throw error;
        continue;
      }
      return { data: endpoint.raw ? payload : payload.data, meta: payload.meta || {}, traceId: responseTraceId };
    } catch (caught) {
      const error = caught instanceof ApiError
        ? caught
        : new ApiError(caught?.name === 'AbortError' ? '请求超时，请检查网络后重试' : '网络连接失败', { traceId });
      if (!shouldRetry(error, attempt)) throw error;
      await wait(2000);
    } finally {
      window.clearTimeout(timeoutId);
      options.signal?.removeEventListener('abort', abortListener);
    }
  }
  throw new ApiError('网络不稳定，请稍后重试', { traceId });
}

async function stream(endpointId, body, options = {}) {
  const endpoint = ENDPOINTS[endpointId];
  if (!endpoint?.stream) throw new ApiError(`端点 ${endpointId} 不支持流式请求`, { code: 'ENDPOINT_NOT_STREAMABLE' });
  const traceId = crypto.randomUUID();
  const token = getAccessToken();
  const headers = {
    Accept: 'text/event-stream',
    'Content-Type': 'application/json',
    'X-Trace-ID': traceId,
    ...(options.headers || {}),
  };
  if (token) headers.Authorization = `Bearer ${token}`;
  const response = await fetch(pathFor(endpoint, options.pathParams), {
    method: endpoint.method,
    headers,
    body: endpoint.method === 'GET' ? undefined : JSON.stringify(body ?? {}),
    signal: options.signal,
  });
  if (!response.ok || !response.body) {
    const payload = await response.json().catch(() => ({}));
    const detail = payload.error || {};
    throw new ApiError(detail.message || '流式请求未完成', {
      code: detail.code,
      status: response.status,
      traceId: payload.meta?.trace_id || traceId,
    });
  }
  const reader = response.body.getReader();
  const decoder = new TextDecoder();
  let buffer = '';
  const dispatch = (block) => {
    if (!block.trim() || block.trimStart().startsWith(':')) return;
    let eventName = 'message';
    const dataLines = [];
    block.split(/\r?\n/).forEach((line) => {
      if (line.startsWith('event:')) eventName = line.slice(6).trim();
      if (line.startsWith('data:')) dataLines.push(line.slice(5).trim());
    });
    if (!dataLines.length) return;
    const raw = dataLines.join('\n');
    let data = raw;
    try { data = JSON.parse(raw); } catch { /* Plain-text SSE data is valid. */ }
    options.onEvent?.({ type: eventName, data });
  };
  while (true) {
    const { done, value } = await reader.read();
    buffer += decoder.decode(value || new Uint8Array(), { stream: !done });
    const blocks = buffer.split(/\r?\n\r?\n/);
    buffer = blocks.pop() || '';
    blocks.forEach(dispatch);
    if (done) break;
  }
  if (buffer.trim()) dispatch(buffer);
}

async function requestFile(endpointId, options = {}) {
  const endpoint = ENDPOINTS[endpointId];
  if (!endpoint) throw new ApiError(`未注册端点 ${endpointId}`, { code: 'ENDPOINT_NOT_REGISTERED' });
  const traceId = crypto.randomUUID();
  const headers = { Accept: '*/*', 'X-Trace-ID': traceId, ...(options.headers || {}) };
  const token = getAccessToken();
  if (endpoint.auth !== false && token) headers.Authorization = `Bearer ${token}`;
  const response = await fetch(`${pathFor(endpoint, options.pathParams)}${new URLSearchParams(options.query || {}).toString() ? `?${new URLSearchParams(options.query).toString()}` : ''}`, {
    method: endpoint.method,
    headers,
    cache: 'no-store',
    signal: options.signal,
  });
  if (!response.ok) {
    const payload = await response.json().catch(() => ({}));
    const detail = payload.error || {};
    if (response.status === 401 && endpoint.auth !== false) clearAuthSession();
    throw new ApiError(detail.message || `文件请求失败（HTTP ${response.status}）`, {
      code: detail.code,
      status: response.status,
      traceId: payload.meta?.trace_id || response.headers.get('X-Trace-ID') || traceId,
    });
  }
  return {
    blob: await response.blob(),
    filename: response.headers.get('Content-Disposition') || '',
    contentType: response.headers.get('Content-Type') || '',
    traceId: response.headers.get('X-Trace-ID') || traceId,
  };
}

export const apiClient = Object.freeze({
  get(endpointId, options = {}) { return request(endpointId, options); },
  post(endpointId, body, options = {}) { return request(endpointId, { ...options, body }); },
  upload(endpointId, formData, options = {}) { return request(endpointId, { ...options, body: formData, timeout: options.timeout || 30000 }); },
  file(endpointId, options = {}) { return requestFile(endpointId, options); },
  stream,
  reportError(error) {
    window.dispatchEvent(new CustomEvent('portal:error', { detail: { message: error.message, traceId: error.traceId || '' } }));
  },
  track(eventName, payload = {}) {
    window.dispatchEvent(new CustomEvent('portal:track', { detail: { eventName, payload, at: Date.now() } }));
  },
});

export { ENDPOINTS };