import { BoardTree } from "./boardTree"
import mutator from "./mutator"
import { IBlock } from "./octoTypes"
import { Utils } from "./utils"

interface Archive {
	version: number
	date: number
	blocks: IBlock[]
}

class Archiver {
	static async exportBoardTree(boardTree: BoardTree) {
		const blocks = boardTree.allBlocks
		const archive: Archive = {
			version: 1,
			date: Date.now(),
			blocks
		}

		this.exportArchive(archive)
	}

	static async exportFullArchive() {
		const blocks = await mutator.exportFullArchive()
		const archive: Archive = {
			version: 1,
			date: Date.now(),
			blocks
		}

		this.exportArchive(archive)
	}

	private static exportArchive(archive: Archive) {
		const content = JSON.stringify(archive)

		const date = new Date()
		const filename = `archive-${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()}.octo`
		const link = document.createElement("a")
		link.style.display = "none"
		// const file = new Blob([content], { type: "text/json" })
		// link.href = URL.createObjectURL(file)
		link.href = "data:text/json," + encodeURIComponent(content)
		link.download = filename
		document.body.appendChild(link)						// FireFox support

		link.click()

		// TODO: Remove or reuse link
	}

	static importFullArchive(onImported?: () => void): void {
		const input = document.createElement("input")
		input.type = "file"
		input.accept = ".octo"
		input.onchange = async () => {
			const file = input.files[0]
			const contents = await (new Response(file)).text()
			Utils.log(`Import ${contents.length} bytes.`)
			const archive: Archive = JSON.parse(contents)
			const { blocks } = archive
			const date = new Date(archive.date)
			Utils.log(`Import archive, version: ${archive.version}, date/time: ${date.toLocaleString()}, ${blocks.length} block(s).`)

			// Basic error checking
			const filteredBlocks = blocks.filter(o => {
				if (!o.id) { return false }
				return true
			})

			Utils.log(`Import ${filteredBlocks.length} filtered blocks.`)

			await mutator.importFullArchive(filteredBlocks)
			Utils.log(`Import completed`)
			onImported?.()
		}

		input.style.display = "none"
		document.body.appendChild(input)
		input.click()

		// TODO: Remove or reuse input
	}
}

export { Archiver }