import type { Asset } from "../api/asset/asset"
import type { FilledImageFieldImage } from "../value/image"
import type { LinkToMediaField } from "../value/linkToMedia"
import { type RTImageNode } from "../value/richText"
import type { InjectMigrationSpecificTypes } from "./Document"

/** An asset to be uploaded to Prismic media library. */
export type MigrationAssetConfig = {
	/**
	 * ID the assets is indexed with on the migration instance.
	 *
	 * @remarks
	 *   This property's value is not necessarily the same as the as the one in the `file` property.
	 *   It is mainly used for deduplication within a `Migration` instance.
	 */
	id: string | URL | File | NonNullable<ConstructorParameters<typeof File>[0]>[0]

	/** File to be uploaded as an asset. */
	file: string | URL | File | NonNullable<ConstructorParameters<typeof File>[0]>[0]

	/** Filename of the asset. */
	filename: string

	/** Notes about the asset. Notes are private and only visible in Prismic media library. */
	notes?: string

	/** Credits and copyright for the asset if any. */
	credits?: string

	/** Alternate text for the asset. */
	alt?: string

	/**
	 * Tags associated with the asset.
	 *
	 * @remarks
	 *   Tags should be at least 3 characters long and 20 characters at most.
	 */
	tags?: string[]
}

/** An image field in a migration. */
export type MigrationImage =
	| PrismicMigrationAsset
	| ({
			/** A reference to the migration asset used to resolve the image field's value. */
			id: PrismicMigrationAsset
	  } & Record<string, PrismicMigrationAsset>)

/** A link to media field in a migration. */
export type MigrationLinkToMedia = Pick<LinkToMediaField<"filled">, "link_type" | "text"> & {
	/** A reference to the migration asset used to resolve the link to media field's value. */
	id: PrismicMigrationAsset
}

/**
 * The minimum amount of information needed to represent a link to media field with the migration
 * API.
 */
export type MigrationLinkToMediaField =
	| Pick<LinkToMediaField<"filled">, "link_type" | "id" | "text">
	| LinkToMediaField<"empty">

/** A rich text image node in a migration. */
export type MigrationRTImageNode = InjectMigrationSpecificTypes<
	Pick<RTImageNode, "type" | "linkTo">
> & {
	/** A reference to the migration asset used to resolve the rich text image node's value. */
	id: PrismicMigrationAsset
}

/** A migration asset used with the Prismic Migration API. */
export class PrismicMigrationAsset {
	/** Asset object from Prismic, available once created. */
	asset?: Asset

	/** Configuration of the asset. */
	config: MigrationAssetConfig

	/** The initial field value this migration field was created with. */
	originalField?: FilledImageFieldImage | LinkToMediaField<"filled"> | RTImageNode

	/**
	 * Creates a migration asset used with the Prismic Migration API.
	 *
	 * @param config - Configuration of the asset.
	 * @param initialField - The initial field value if any.
	 * @returns A migration asset instance.
	 */
	constructor(
		config: MigrationAssetConfig,
		initialField?: FilledImageFieldImage | LinkToMediaField<"filled"> | RTImageNode,
	) {
		this.config = config
		this.originalField = initialField
	}
}