import { z } from "zod/mini"

/**
 * SideConstraint accepts multiple input formats and normalizes to number | null:
 * - Integer values
 * - String integers (e.g., "100")
 * - Pixel strings (e.g., "100px")
 * - "auto" or "" → null
 * - null
 */
export const SideConstraintSchema: z.ZodMiniType<number | null> = z.union([
	z.pipe(
		z.literal("auto"),
		z.transform(() => null),
	),
	z.pipe(
		z.literal(""),
		z.transform(() => null),
	),
	z.null(),
	z.number().check(z.int()),
	z.pipe(
		z.string(),
		z.transform((s: string) => parseInt(s.replace("px", ""), 10)),
	),
])

export const ImageConstraintSchema = z.object({
	width: z.optional(SideConstraintSchema),
	height: z.optional(SideConstraintSchema),
})

export type ImageConstraint = z.infer<typeof ImageConstraintSchema>

const ThumbnailSchema = z.object({
	name: z.string(),
	width: z.optional(SideConstraintSchema),
	height: z.optional(SideConstraintSchema),
})

const ImageConfigSchema = z.object({
	label: z.nullish(z.string()),
	placeholder: z.optional(z.string()),
	constraint: z.optional(ImageConstraintSchema),
	thumbnails: z.optional(z.array(ThumbnailSchema)),
})

export const ImageModelSchema = z.object({
	type: z.literal("Image"),
	fieldset: z.nullish(z.string()),
	config: z.optional(ImageConfigSchema),
})

export type ImageModel = z.infer<typeof ImageModelSchema>