import {type BaseSchemaTypeOptions, type SanityDocumentLike, type SchemaType} from '@sanity/types'

import {type CreateLinkedSanityDocument, type CreateLinkMetadata} from './types'

/**
 * @internal
 */
export function getSanityCreateLinkMetadata(
  doc: SanityDocumentLike | undefined,
): CreateLinkMetadata | undefined {
  return (doc as CreateLinkedSanityDocument | undefined)?._create
}

/**
 * @internal
 */
export function isSanityCreateLinked(metadata: CreateLinkMetadata | undefined): boolean {
  return metadata?.ejected === false
}

/**
 * @internal
 */
export function isSanityCreateLinkedDocument(doc: SanityDocumentLike | undefined): boolean {
  return isSanityCreateLinked(getSanityCreateLinkMetadata(doc))
}

/**
 * @internal
 */
export function isSanityCreateExcludedType(schemaType: SchemaType): boolean {
  const options = schemaType.options as BaseSchemaTypeOptions | undefined
  if (typeof options?.sanityCreate?.exclude === 'boolean') {
    return options?.sanityCreate?.exclude
  }
  if (schemaType?.type) {
    return isSanityCreateExcludedType(schemaType?.type)
  }
  return false
}

/**
 * Documents with fields with a value (non-underscore-prefixed) are not supported by Start in Create yet,
 * because Create would overwrite them.
 * This includes pristine new documents with initialValues or created from initial value templates.
 * @internal
 */
export function isSanityCreateStartCompatibleDoc(doc: SanityDocumentLike): boolean {
  const nonNullEntries = Object.entries(doc)
    .filter(([key]) => !key.startsWith('_'))
    /* we could possibly allow empty string and array, but its not for now */
    .filter(([, value]) => !(value === null || value === undefined))

  return !nonNullEntries.length
}