import TableFetch from "./fetch/TableFetch.js"
import ViewFetch from "./fetch/ViewFetch.js"
import QueryFetch from "./fetch/QueryFetch.js"

/**
 * Fetches the schema of any kind of datasource.
 */
export const fetchDatasourceSchema = async datasource => {
  const type = datasource?.type

  // Nested providers should already have exposed their own schema
  if (type === "provider") {
    return datasource.value?.schema
  }

  // Field sources have their schema statically defined
  if (type === "field") {
    if (datasource.fieldType === "attachment") {
      return {
        url: {
          type: "string",
        },
        name: {
          type: "string",
        },
      }
    } else if (datasource.fieldType === "array") {
      return {
        value: {
          type: "string",
        },
      }
    }
  }

  // All normal datasource schema can use their corresponsing implementations
  // in the data fetch classes
  if (type === "table" || type === "link") {
    return TableFetch.getSchema(datasource)
  }
  if (type === "view") {
    return ViewFetch.getSchema(datasource)
  }
  if (type === "query") {
    return QueryFetch.getSchema(datasource)
  }

  return null
}