import { Boom } from '@hapi/boom'
import { createHash } from 'crypto'
import { createWriteStream, promises as fs } from 'fs'
import { tmpdir } from 'os'
import { join } from 'path'
import {
	CatalogCollection,
	CatalogStatus,
	OrderDetails,
	OrderProduct,
	Product,
	ProductCreate,
	ProductUpdate,
	WAMediaUpload,
	WAMediaUploadFunction
} from '../Types'
import { BinaryNode, getBinaryNodeChild, getBinaryNodeChildren, getBinaryNodeChildString } from '../WABinary'
import { generateMessageIDV2 } from './generics'
import { getStream, getUrlFromDirectPath } from './messages-media'

export const parseCatalogNode = (node: BinaryNode) => {
	const catalogNode = getBinaryNodeChild(node, 'product_catalog')
	const products = getBinaryNodeChildren(catalogNode, 'product').map(parseProductNode)
	const paging = getBinaryNodeChild(catalogNode, 'paging')

	return {
		products,
		nextPageCursor: paging ? getBinaryNodeChildString(paging, 'after') : undefined
	}
}

export const parseCollectionsNode = (node: BinaryNode) => {
	const collectionsNode = getBinaryNodeChild(node, 'collections')
	const collections = getBinaryNodeChildren(collectionsNode, 'collection').map<CatalogCollection>(collectionNode => {
		const id = getBinaryNodeChildString(collectionNode, 'id')!
		const name = getBinaryNodeChildString(collectionNode, 'name')!

		const products = getBinaryNodeChildren(collectionNode, 'product').map(parseProductNode)
		return {
			id,
			name,
			products,
			status: parseStatusInfo(collectionNode)
		}
	})

	return {
		collections
	}
}

export const parseOrderDetailsNode = (node: BinaryNode) => {
	const orderNode = getBinaryNodeChild(node, 'order')
	const products = getBinaryNodeChildren(orderNode, 'product').map<OrderProduct>(productNode => {
		const imageNode = getBinaryNodeChild(productNode, 'image')!
		return {
			id: getBinaryNodeChildString(productNode, 'id')!,
			name: getBinaryNodeChildString(productNode, 'name')!,
			imageUrl: getBinaryNodeChildString(imageNode, 'url')!,
			price: +getBinaryNodeChildString(productNode, 'price')!,
			currency: getBinaryNodeChildString(productNode, 'currency')!,
			quantity: +getBinaryNodeChildString(productNode, 'quantity')!
		}
	})

	const priceNode = getBinaryNodeChild(orderNode, 'price')

	const orderDetails: OrderDetails = {
		price: {
			total: +getBinaryNodeChildString(priceNode, 'total')!,
			currency: getBinaryNodeChildString(priceNode, 'currency')!
		},
		products
	}

	return orderDetails
}

export const toProductNode = (productId: string | undefined, product: ProductCreate | ProductUpdate) => {
	const attrs: BinaryNode['attrs'] = {}
	const content: BinaryNode[] = []

	if (typeof productId !== 'undefined') {
		content.push({
			tag: 'id',
			attrs: {},
			content: Buffer.from(productId)
		})
	}

	if (typeof product.name !== 'undefined') {
		content.push({
			tag: 'name',
			attrs: {},
			content: Buffer.from(product.name)
		})
	}

	if (typeof product.description !== 'undefined') {
		content.push({
			tag: 'description',
			attrs: {},
			content: Buffer.from(product.description)
		})
	}

	if (typeof product.retailerId !== 'undefined') {
		content.push({
			tag: 'retailer_id',
			attrs: {},
			content: Buffer.from(product.retailerId)
		})
	}

	if (product.images.length) {
		content.push({
			tag: 'media',
			attrs: {},
			content: product.images.map(img => {
				if (!('url' in img)) {
					throw new Boom('Expected img for product to already be uploaded', { statusCode: 400 })
				}

				return {
					tag: 'image',
					attrs: {},
					content: [
						{
							tag: 'url',
							attrs: {},
							content: Buffer.from(img.url.toString())
						}
					]
				}
			})
		})
	}

	if (typeof product.price !== 'undefined') {
		content.push({
			tag: 'price',
			attrs: {},
			content: Buffer.from(product.price.toString())
		})
	}

	if (typeof product.currency !== 'undefined') {
		content.push({
			tag: 'currency',
			attrs: {},
			content: Buffer.from(product.currency)
		})
	}

	if ('originCountryCode' in product) {
		if (typeof product.originCountryCode === 'undefined') {
			attrs['compliance_category'] = 'COUNTRY_ORIGIN_EXEMPT'
		} else {
			content.push({
				tag: 'compliance_info',
				attrs: {},
				content: [
					{
						tag: 'country_code_origin',
						attrs: {},
						content: Buffer.from(product.originCountryCode)
					}
				]
			})
		}
	}

	if (typeof product.isHidden !== 'undefined') {
		attrs['is_hidden'] = product.isHidden.toString()
	}

	const node: BinaryNode = {
		tag: 'product',
		attrs,
		content
	}
	return node
}

export const parseProductNode = (productNode: BinaryNode) => {
	const isHidden = productNode.attrs.is_hidden === 'true'
	const id = getBinaryNodeChildString(productNode, 'id')!

	const mediaNode = getBinaryNodeChild(productNode, 'media')!
	const statusInfoNode = getBinaryNodeChild(productNode, 'status_info')!

	const product: Product = {
		id,
		imageUrls: parseImageUrls(mediaNode),
		reviewStatus: {
			whatsapp: getBinaryNodeChildString(statusInfoNode, 'status')!
		},
		availability: 'in stock',
		name: getBinaryNodeChildString(productNode, 'name')!,
		retailerId: getBinaryNodeChildString(productNode, 'retailer_id'),
		url: getBinaryNodeChildString(productNode, 'url'),
		description: getBinaryNodeChildString(productNode, 'description')!,
		price: +getBinaryNodeChildString(productNode, 'price')!,
		currency: getBinaryNodeChildString(productNode, 'currency')!,
		isHidden
	}

	return product
}

/**
 * Uploads images not already uploaded to WA's servers
 */
export async function uploadingNecessaryImagesOfProduct<T extends ProductUpdate | ProductCreate>(
	product: T,
	waUploadToServer: WAMediaUploadFunction,
	timeoutMs = 30_000
) {
	product = {
		...product,
		images: product.images
			? await uploadingNecessaryImages(product.images, waUploadToServer, timeoutMs)
			: product.images
	}
	return product
}

/**
 * Uploads images not already uploaded to WA's servers
 */
export const uploadingNecessaryImages = async (
	images: WAMediaUpload[],
	waUploadToServer: WAMediaUploadFunction,
	timeoutMs = 30_000
) => {
	const results = await Promise.all(
		images.map<Promise<{ url: string }>>(async img => {
			if ('url' in img) {
				const url = img.url.toString()
				if (url.includes('.whatsapp.net')) {
					return { url }
				}
			}

			const { stream } = await getStream(img)
			const hasher = createHash('sha256')

			const filePath = join(tmpdir(), 'img' + generateMessageIDV2())
			const encFileWriteStream = createWriteStream(filePath)

			for await (const block of stream) {
				hasher.update(block)
				encFileWriteStream.write(block)
			}

			const sha = hasher.digest('base64')

			const { directPath } = await waUploadToServer(filePath, {
				mediaType: 'product-catalog-image',
				fileEncSha256B64: sha,
				timeoutMs
			})

			await fs.unlink(filePath).catch(err => console.log('Error deleting temp file ', err))

			return { url: getUrlFromDirectPath(directPath) }
		})
	)
	return results
}

const parseImageUrls = (mediaNode: BinaryNode) => {
	const imgNode = getBinaryNodeChild(mediaNode, 'image')
	return {
		requested: getBinaryNodeChildString(imgNode, 'request_image_url')!,
		original: getBinaryNodeChildString(imgNode, 'original_image_url')!
	}
}

const parseStatusInfo = (mediaNode: BinaryNode): CatalogStatus => {
	const node = getBinaryNodeChild(mediaNode, 'status_info')
	return {
		status: getBinaryNodeChildString(node, 'status')!,
		canAppeal: getBinaryNodeChildString(node, 'can_appeal') === 'true'
	}
}