import { T } from '@tldraw/validate'
import { assetIdValidator } from '../assets/TLBaseAsset'
import { vecModelValidator } from '../misc/geometry-types'
import { TLAssetId } from '../records/TLAsset'
import { createShapePropsMigrationIds, createShapePropsMigrationSequence } from '../records/TLShape'
import { RecordProps } from '../recordsWithProps'
import { TLShapeCrop } from './ShapeWithCrop'
import { TLBaseShape } from './TLBaseShape'

/**
 * Validator for image shape crop data. Defines the structure for cropping an image,
 * specifying the visible region within the original image bounds.
 *
 * @public
 * @example
 * ```ts
 * const cropData: TLShapeCrop = {
 *   topLeft: { x: 0.1, y: 0.1 },
 *   bottomRight: { x: 0.9, y: 0.9 },
 *   isCircle: false
 * }
 *
 * const isValid = ImageShapeCrop.isValid(cropData)
 * ```
 */
export const ImageShapeCrop: T.ObjectValidator<TLShapeCrop> = T.object({
	topLeft: vecModelValidator,
	bottomRight: vecModelValidator,
	isCircle: T.boolean.optional(),
})

/**
 * Properties for an image shape. Image shapes display raster images on the canvas,
 * with support for cropping, flipping, and asset management.
 *
 * @public
 * @example
 * ```ts
 * const imageProps: TLImageShapeProps = {
 *   w: 300,
 *   h: 200,
 *   playing: true,
 *   url: 'https://example.com/image.jpg',
 *   assetId: 'asset:image123',
 *   crop: null,
 *   flipX: false,
 *   flipY: false,
 *   altText: 'A sample image'
 * }
 * ```
 */
export interface TLImageShapeProps {
	/** Width of the image shape in canvas units */
	w: number
	/** Height of the image shape in canvas units */
	h: number
	/** Whether animated images (like GIFs) should play */
	playing: boolean
	/** URL of the image resource */
	url: string
	/** ID of the associated asset record, null if no asset */
	assetId: TLAssetId | null
	/** Crop data defining visible region of the image, null for no cropping */
	crop: TLShapeCrop | null
	/** Whether to flip the image horizontally */
	flipX: boolean
	/** Whether to flip the image vertically */
	flipY: boolean
	/** Alternative text for accessibility and when image fails to load */
	altText: string
}

/**
 * An image shape representing a raster image on the canvas. Image shapes can display
 * various image formats and support features like cropping, flipping, and asset management.
 *
 * @public
 * @example
 * ```ts
 * const imageShape: TLImageShape = {
 *   id: 'shape:image1',
 *   type: 'image',
 *   x: 100,
 *   y: 100,
 *   rotation: 0,
 *   index: 'a1',
 *   parentId: 'page:main',
 *   isLocked: false,
 *   opacity: 1,
 *   props: {
 *     w: 400,
 *     h: 300,
 *     playing: true,
 *     url: '',
 *     assetId: 'asset:photo1',
 *     crop: null,
 *     flipX: false,
 *     flipY: false,
 *     altText: 'Sample photo'
 *   },
 *   meta: {},
 *   typeName: 'shape'
 * }
 * ```
 */
export type TLImageShape = TLBaseShape<'image', TLImageShapeProps>

/**
 * Validation schema for image shape properties. Defines the runtime validation rules
 * for all properties of image shapes, ensuring data integrity and type safety.
 *
 * @public
 * @example
 * ```ts
 * import { imageShapeProps } from '@tldraw/tlschema'
 *
 * // Used internally by the validation system
 * const validator = T.object(imageShapeProps)
 * const validatedProps = validator.validate(someImageProps)
 * ```
 */
export const imageShapeProps: RecordProps<TLImageShape> = {
	w: T.nonZeroNumber,
	h: T.nonZeroNumber,
	playing: T.boolean,
	url: T.linkUrl,
	assetId: assetIdValidator.nullable(),
	crop: ImageShapeCrop.nullable(),
	flipX: T.boolean,
	flipY: T.boolean,
	altText: T.string,
}

const Versions = createShapePropsMigrationIds('image', {
	AddUrlProp: 1,
	AddCropProp: 2,
	MakeUrlsValid: 3,
	AddFlipProps: 4,
	AddAltText: 5,
})

/**
 * Version identifiers for image shape migrations. These version numbers track
 * schema changes over time to enable proper data migration between versions.
 *
 * @public
 */
export { Versions as imageShapeVersions }

/**
 * Migration sequence for image shapes. Handles schema evolution over time by defining
 * how to upgrade and downgrade image shape data between different versions. Includes
 * migrations for URL properties, crop functionality, flip properties, and accessibility features.
 *
 * @public
 */
export const imageShapeMigrations = createShapePropsMigrationSequence({
	sequence: [
		{
			id: Versions.AddUrlProp,
			up: (props) => {
				props.url = ''
			},
			down: 'retired',
		},
		{
			id: Versions.AddCropProp,
			up: (props) => {
				props.crop = null
			},
			down: (props) => {
				delete props.crop
			},
		},
		{
			id: Versions.MakeUrlsValid,
			up: (props) => {
				if (!T.linkUrl.isValid(props.url)) {
					props.url = ''
				}
			},
			down: (_props) => {
				// noop
			},
		},
		{
			id: Versions.AddFlipProps,
			up: (props) => {
				props.flipX = false
				props.flipY = false
			},
			down: (props) => {
				delete props.flipX
				delete props.flipY
			},
		},
		{
			id: Versions.AddAltText,
			up: (props) => {
				props.altText = ''
			},
			down: (props) => {
				delete props.altText
			},
		},
	],
})