import { postJson } from './http';

export type ClientErrorLevel = 'fatal' | 'error' | 'warn' | 'info';
export type ClientErrorCategory =
  | 'js_error'
  | 'unhandled_rejection'
  | 'api_error'
  | 'validation_error'
  | 'network'
  | 'render'
  | 'bridge'
  | 'other';

export type ClientErrorReporterOptions = {
  apiBase: string;
  clientApp: string;
  getToken?: () => string | null;
};

export function installClientErrorReporting(opts: ClientErrorReporterOptions) {
  if (typeof window === 'undefined') return;

  const report = (payload: {
    level: ClientErrorLevel;
    category: ClientErrorCategory;
    message: string;
    stack?: string;
    extra?: Record<string, unknown>;
  }) => {
    const token = opts.getToken?.() ?? localStorage.getItem('accessToken');
    const headers: Record<string, string> = {
      'Content-Type': 'application/json',
      'X-Client-App': opts.clientApp,
    };
    if (token) headers.Authorization = `Bearer ${token}`;

    postJson({
      url: `${opts.apiBase}/common/client-errors`,
      headers,
      body: {
        level: payload.level,
        category: payload.category,
        message: payload.message,
        stack: payload.stack,
        pagePath: window.location.pathname,
        clientApp: opts.clientApp,
        extra: payload.extra,
      },
    });
  };

  window.addEventListener('error', (ev) => {
    report({
      level: 'error',
      category: 'js_error',
      message: ev.message || 'Unknown error',
      stack: ev.error instanceof Error ? ev.error.stack : undefined,
    });
  });

  window.addEventListener('unhandledrejection', (ev) => {
    const reason = ev.reason;
    report({
      level: 'error',
      category: 'unhandled_rejection',
      message: reason instanceof Error ? reason.message : String(reason),
      stack: reason instanceof Error ? reason.stack : undefined,
    });
  });
}

export function reportApiError(
  opts: ClientErrorReporterOptions,
  input: { message: string; status?: number; url?: string; category?: ClientErrorCategory },
) {
  if (typeof window === 'undefined') return;
  if (input.url?.includes('/common/client-errors')) return;
  const token = opts.getToken?.() ?? localStorage.getItem('accessToken');
  const headers: Record<string, string> = {
    'Content-Type': 'application/json',
    'X-Client-App': opts.clientApp,
  };
  if (token) headers.Authorization = `Bearer ${token}`;

  postJson({
    url: `${opts.apiBase}/common/client-errors`,
    headers,
    body: {
      level: 'warn',
      category: input.category ?? (input.status === 400 ? 'validation_error' : 'api_error'),
      message: input.message.slice(0, 1000),
      pagePath: window.location.pathname,
      clientApp: opts.clientApp,
      extra: { status: input.status, url: input.url },
    },
  });
}