import type { ConfigKeys, IConfig } from '@electron/types/runtime';
import configManager from '@electron/service/config-service';
import type { HostApiResult } from '@src/types/runtime';
import type { HostApiContext } from '../context';
import type { NormalizedHostApiRequest } from '../route-utils';
import { fail, ok, parseJsonBody } from '../route-utils';

function extractSettingKey(pathname: string): string | null {
  if (!pathname.startsWith('/api/settings/')) {
    return null;
  }

  const rawKey = pathname.slice('/api/settings/'.length).trim();
  if (!rawKey) {
    return null;
  }

  return decodeURIComponent(rawKey);
}

function isPlainObject(value: unknown): value is Record<string, unknown> {
  return typeof value === 'object' && value !== null && !Array.isArray(value);
}

function unwrapSettingValue(body: unknown): unknown {
  if (isPlainObject(body) && Object.prototype.hasOwnProperty.call(body, 'value')) {
    return body.value;
  }

  return body;
}

export async function handleSettingsRoutes(
  request: NormalizedHostApiRequest,
  _ctx: HostApiContext,
): Promise<HostApiResult<unknown> | null> {
  const { pathname, method } = request;

  if (pathname === '/api/settings' && method === 'GET') {
    try {
      return ok(configManager.getConfig());
    } catch (error) {
      return fail(500, error instanceof Error ? error.message : String(error));
    }
  }

  if (pathname === '/api/settings' && method === 'PUT') {
    try {
      const body = parseJsonBody<unknown>(request.body);
      if (!isPlainObject(body)) {
        return fail(400, 'settings payload must be an object');
      }

      configManager.update(body as Partial<IConfig>);

      return ok({
        success: true,
        settings: configManager.getConfig(),
      });
    } catch (error) {
      return fail(500, error instanceof Error ? error.message : String(error));
    }
  }

  const key = extractSettingKey(pathname);
  if (pathname.startsWith('/api/settings/') && !key) {
    return fail(400, 'setting key is required');
  }

  if (!key) {
    return null;
  }

  if (method === 'GET') {
    try {
      return ok({
        value: configManager.get(key as ConfigKeys),
      });
    } catch (error) {
      return fail(500, error instanceof Error ? error.message : String(error));
    }
  }

  if (method === 'PUT') {
    try {
      const value = unwrapSettingValue(parseJsonBody<unknown>(request.body));
      configManager.set(key as ConfigKeys, value);

      return ok({
        success: true,
        key,
        value,
      });
    } catch (error) {
      return fail(500, error instanceof Error ? error.message : String(error));
    }
  }

  return null;
}