'use client';

import { toast } from 'sonner';

import { ApiError } from '@/lib/api/client';

/**
 * Build a multi-line string suitable for an inline form banner — the
 * primary message followed by `Error code:` / `Reference ID:` lines when
 * the error is an ApiError. Use from admin forms that want to keep
 * their inline error UX instead of switching to a toast.
 *
 * Example output:
 *   "Couldn't save the role.
 *    Error code: ROLES_DUPLICATE_NAME
 *    Reference ID: 1ab2c3d4-…"
 */
export function formatErrorBanner(err: unknown, fallback = 'Something went wrong.'): string {
  if (err instanceof ApiError) {
    const parts = [err.message || fallback];
    if (err.code) parts.push(`Error code: ${err.code}`);
    if (err.requestId) parts.push(`Reference ID: ${err.requestId}`);
    return parts.join('\n');
  }
  if (err instanceof Error) return err.message || fallback;
  return fallback;
}

/**
 * Render an API error as a toast in the consistent platform format:
 *
 *   ┌─────────────────────────────────────────────┐
 *   │ {plain-text message}                        │
 *   │                                             │
 *   │ Error code: EXPENSES_RECEIPT_REQUIRED       │
 *   │ Reference ID: ab12-cd34-…  [Copy]           │
 *   └─────────────────────────────────────────────┘
 *
 * Use this anywhere a `useMutation({ onError })` would otherwise just
 * call `toast.error(err.message)`. Falls back gracefully when the error
 * isn't an ApiError (network errors, programmer errors, etc.).
 */
export function toastError(err: unknown, fallback = 'Something went wrong.'): void {
  if (err instanceof ApiError) {
    const lines: string[] = [];
    if (err.code) lines.push(`Error code: ${err.code}`);
    if (err.requestId) lines.push(`Reference ID: ${err.requestId}`);
    toast.error(err.message, {
      description: lines.length > 0 ? lines.join('\n') : undefined,
      // Long enough to read the message + grab the reference id.
      duration: 8_000,
      action: err.requestId
        ? {
            label: 'Copy ID',
            onClick: () => {
              if (typeof navigator !== 'undefined' && navigator.clipboard) {
                void navigator.clipboard.writeText(err.requestId!);
                toast.success('Reference ID copied');
              }
            },
          }
        : undefined,
    });
    return;
  }
  if (err instanceof Error) {
    toast.error(err.message || fallback);
    return;
  }
  toast.error(fallback);
}