import type { EmptyObjectField, FieldState } from "./types"

/**
 * OEmbed 1.0 possible types.
 *
 * @see oEmbed specification: {@link https://oembed.com}
 */
export const OEmbedType = {
	Photo: "photo",
	Video: "video",
	Link: "link",
	Rich: "rich",
} as const

/**
 * OEmbed response base fields. Those are every mandatory fields an oEmbed response must feature.
 *
 * @see oEmbed specification: {@link https://oembed.com}
 */
type OEmbedBase<TType extends (typeof OEmbedType)[keyof typeof OEmbedType]> = {
	/** OEmbed resource type. */
	type: TType

	/** OEmbed version number, this must be "1.0". */
	version: string
}

/**
 * OEmbed response extra fields. Those are every non-mandatory and unknown fields an oEmbed response
 * can feature.
 *
 * @see oEmbed specification: {@link https://oembed.com}
 */
export type OEmbedExtra = {
	/** OEmbed text title, describing the resource. */
	title?: string | null

	/** OEmbed resource author/owner name. */
	author_name?: string | null

	/** OEmbed resource author/owner URL. */
	author_url?: string | null

	/** OEmbed resource provider name. */
	provider_name?: string | null

	/** OEmbed resource provider URL. */
	provider_url?: string | null

	/** OEmbed suggested cache lifetime for the resource, in seconds. */
	cache_age?: number | null

	/** OEmbed resource thumbnail URL. */
	thumbnail_url?: string | null

	/** OEmbed resource thumbnail width. */
	thumbnail_width?: number | null

	/** OEmbed resource thumbnail height. */
	thumbnail_height?: number | null

	/**
	 * Providers may optionally include any parameters not specified in this document (so long as they
	 * use the same key-value format) and consumers may choose to ignore these. Consumers must ignore
	 * parameters they do not understand.
	 *
	 * @see oEmbed specification: {@link https://oembed.com}
	 */
	[key: string]: unknown | null
}

/**
 * OEmbed photo type. Those are every mandatory fields an oEmbed photo response must feature.
 *
 * @see oEmbed specification: {@link https://oembed.com}
 */
export type PhotoOEmbed = OEmbedBase<typeof OEmbedType.Photo> & {
	/** OEmbed source URL of the image. */
	url: string

	/** OEmbed width in pixels of the image. */
	width: number

	/** OEmbed height in pixels of the image. */
	height: number
}

/**
 * OEmbed video type. Those are every mandatory fields an oEmbed video response must feature.
 *
 * @see oEmbed specification: {@link https://oembed.com}
 */
export type VideoOEmbed = OEmbedBase<typeof OEmbedType.Video> & {
	/** OEmbed HTML required to embed a video player. */
	html: string

	/** OEmbed width in pixels required to display the HTML. */
	width: number

	/** OEmbed height in pixels required to display the HTML. */
	height: number
}

/**
 * OEmbed link type. Those are every mandatory fields an oEmbed link response must feature.
 *
 * @see oEmbed specification: {@link https://oembed.com}
 */
export type LinkOEmbed = OEmbedBase<typeof OEmbedType.Link>

/**
 * OEmbed rich type. Those are every mandatory fields an oEmbed rich response must feature.
 *
 * @see oEmbed specification: {@link https://oembed.com}
 */
export type RichOEmbed = OEmbedBase<typeof OEmbedType.Rich> & {
	/** OEmbed HTML required to display the resource. */
	html: string

	/** OEmbed width in pixels required to display the HTML. */
	width: number

	/** OEmbed height in pixels required to display the HTML. */
	height: number
}

/**
 * Any of the possible types of oEmbed response. Those contains only mandatory fields their
 * respective oEmbed response type must feature.
 *
 * @see oEmbed specification: {@link https://oembed.com}
 */
export type AnyOEmbed = PhotoOEmbed | VideoOEmbed | LinkOEmbed | RichOEmbed

/**
 * An embed field.
 *
 * @typeParam Data - Data provided by the URL's oEmbed provider.
 * @typeParam State - State of the field which determines its shape.
 * @see More details: {@link https://prismic.io/docs/embed}
 */
export type EmbedField<
	Data extends AnyOEmbed = AnyOEmbed & OEmbedExtra,
	State extends FieldState = FieldState,
> = State extends "empty"
	? EmptyObjectField
	: Data & {
			embed_url: string
			html: string | null
		}