import { SystemConfigEntry } from '../admin/system-config.service';
import { mergeRedactedUpdate } from '../utils/redact';

function parseJsonObject(value: unknown): any {
  if (!value) return {};
  if (typeof value === 'object') return value;
  if (typeof value !== 'string') return {};
  try {
    const parsed = JSON.parse(value);
    return parsed && typeof parsed === 'object' ? parsed : {};
  } catch {
    return {};
  }
}

function mergeJsonStringUpdate(incoming: string, existing: string | undefined): string {
  try {
    const parsedIncoming = JSON.parse(incoming);
    const parsedExisting = parseJsonObject(existing);
    return JSON.stringify(mergeRedactedUpdate(parsedIncoming, parsedExisting));
  } catch {
    return mergeRedactedUpdate(incoming, existing);
  }
}

export function mergeSystemConfigEntriesUpdate(
  entries: Array<{ key: string; value: string }>,
  existing: SystemConfigEntry[],
): Array<{ key: string; value: string }> {
  const existingByKey = new Map(existing.map(entry => [entry.key, entry.value]));
  return entries.map(entry => {
    const oldValue = existingByKey.get(entry.key);
    return { ...entry, value: mergeJsonStringUpdate(entry.value, oldValue) };
  });
}

export function mergeNotifySettingsUpdate(incoming: any, existing: any): any {
  return mergeRedactedUpdate(incoming || {}, existing || {});
}

export function mergePushUserNotifyConfigUpdate(incoming: { notify_config?: any }, existing?: { notify_config?: string }): any {
  return mergeNotifySettingsUpdate(
    parseJsonObject(incoming?.notify_config),
    parseJsonObject(existing?.notify_config),
  );
}