// See: packages/grafana-ui/src/types/plugin.ts
interface PluginJSONSchema {
  id: string;
  info: PluginMetaInfo;
}

interface PluginMetaInfo {
  version: string;
}

export const validatePluginJson = (pluginJson: any) => {
  if (!pluginJson.id) {
    throw new Error('Plugin id is missing in plugin.json');
  }

  if (!pluginJson.info) {
    throw new Error('Plugin info node is missing in plugin.json');
  }

  if (!pluginJson.info.version) {
    throw new Error('Plugin info.version is missing in plugin.json');
  }

  const types = ['panel', 'datasource', 'app'];
  const type = pluginJson.type;
  if (!types.includes(type)) {
    throw new Error('Invalid plugin type in plugin.json: ' + type);
  }

  if (!pluginJson.id.endsWith('-' + type)) {
    throw new Error('[plugin.json] id should end with: -' + type);
  }
};

export const getPluginJson = (path: string): PluginJSONSchema => {
  let pluginJson;
  try {
    pluginJson = require(path);
  } catch (e) {
    throw new Error('Unable to find: ' + path);
  }

  validatePluginJson(pluginJson);

  return pluginJson as PluginJSONSchema;
};