import { ExternalLinkContent } from "@prismicio/types-internal/lib/content"
import type { Link } from "@prismicio/types-internal/lib/customtypes"

import dataset from "../../../dataset/weblinks.json"
import type { MockConfig } from "../../../MockConfig"
import { slug } from "../../../utils"

export type ExternalLinkConfig = MockConfig<Link["type"], ExternalLinkContent>

export const ExternalLinkMock = {
	generate(def: Link, config?: ExternalLinkConfig): ExternalLinkContent {
		let value: ExternalLinkContent

		if (config?.value) {
			value = config.value
		} else {
			const url = getRandomUrl()

			const text = def.config?.allowText ? slug() : undefined

			const variant =
				def.config?.variants?.[
					Math.floor(Math.random() * def.config.variants.length)
				]

			value = {
				__TYPE__: "ExternalLink",
				url,
				...(text && { text }),
				...(variant && { variant }),
			}
		}

		return ExternalLinkContent.encode(value)
	},
}

function getRandomUrl(): string {
	const webLinks = dataset as ReadonlyArray<string>
	const randomIndex = Math.floor(Math.random() * webLinks.length)
	const url = webLinks[randomIndex]
	if (!url) throw new Error("Something happened during web link generation.")
	return url
}