import { RouterContext } from "https://deno.land/x/oak/mod.ts"
import "https://deno.land/std@0.178.0/dotenv/load.ts";
import { writeFileSync, copy } from "https://deno.land/std/fs/mod.ts";
import { renderFileToString } from "https://deno.land/x/dejs/mod.ts";

import getFileHash from './getFileHash.ts';
import allowedFiletypes from './fileTypes.ts';
import db from './mongodb.ts';
const imageCollection = db.collection('images');
const userTable = db.collection('users');


export const site = async (ctx: RouterContext) => {
	if(ctx.params.filename == "sw.js" || ctx.params.filename == "script.js"){
		ctx.response.type = "text/javascript"
	}
	ctx.response.body = await renderFileToString(`${Deno.cwd()}/site/${ctx.params.filename}`, {})
}

export const icons = async (ctx: RouterContext, next: any) => {
	const identifier = ctx.params.filename

	console.log(["t_192.png", "t_48.png", "t_96.png"].indexOf(identifier))

	if (["t_192.png", "t_48.png", "t_96.png"].indexOf(identifier) != -1){
		const img = await Deno.readFile(`${Deno.cwd()}/site/i/${ctx.params.filename}`);
		ctx.response.type = "image/png";
		ctx.response.body = img;
	} else {
		next()
	}
}

export const announce = async (ctx: RouterContext) => {
	const body = await ctx.request.body({ type: 'json'}).value;

	const count = await imageCollection.findOne({hash:body.hash});

	if(body.size >= 50000000 && body.usercode == "anonymous"){
		ctx.response.status = 403
	}
	else if(count){
		ctx.response.body = {file: count.filename};
		ctx.response.status = 409
	}else{
		if(body.size >= 50000000){
			const users = await userTable.findOne({token:body.usercode});
			if(users){
				ctx.response.status = 200
			}else{
				ctx.response.status = 403
			}
		}else{
			ctx.response.status = 200
		}
	}
}

export const chunks = async (ctx: RouterContext) => {
	const hash = ctx.request.headers.get("file-hash");
	const number = ctx.request.headers.get("file-hash");

	const body = await ctx.request.body({ type: 'form-data'});
	const formData = await body.value.read();

	const size = ctx.request.headers.get("content-range").split("/")[1]
	const data = await Deno.readFile(formData.files[0].filename)

	Deno.writeFileSync(`${Deno.env.get("TMPPATH")}${hash}.${ctx.request.headers.get("content-number")}.temp`, data)

	ctx.response.status = 200
}

export const mergeChunks = async (ctx: RouterContext) => {
	const body = await ctx.request.body({ type: 'json'}).value;

	const ts = new Date();
	let newname = `${ts.valueOf()}${allowedFiletypes.get(body.type)}`

	let files = []
	for await (const dirEntry of Deno.readDir(Deno.env.get("TMPPATH"))) {
		if(dirEntry.name.includes(body.hash) && dirEntry.isFile){
			files.push(dirEntry.name)
		}

	}

	const tempFile = await Deno.makeTempFile();

	for (let i = 0; i < files.length; i++) {
		let file = files.find(elem => elem.includes(`.${i}.temp`))
		const data = await Deno.readFileSync(`${Deno.env.get("TMPPATH")}${file}`)

		await Deno.writeFileSync(tempFile, data, {"append": true})
		Deno.remove(`${Deno.env.get("TMPPATH")}${file}`);
	}

	await copy(tempFile, `${Deno.env.get("IMAGEPATH")}${newname}`)

	const id = await imageCollection.insertOne({
		hash:body.hash,
		mime:body.type,
		filename:newname,
		usercode:body.usercode,
		time:ts
	});


	const newhash = await getFileHash(tempFile)
	if(body.hash == newhash){
		ctx.response.body = {"file":newname}
		ctx.response.status = 201
	}else{
		ctx.response.status = 418
	}
}

export const getImage = async (ctx: RouterContext) => {
	const identifier = ctx.params.filename;

	const info = await imageCollection.findOne({filename:identifier});

	if(!info){
		ctx.response.status = 404;
		ctx.response.body = {message: 'image does not exist'};
		return
	}else{
		const img = await Deno.readFile(`${Deno.env.get("IMAGEPATH")}${identifier}`);
		
		ctx.response.type = info.mime;
		ctx.response.body = img;
	}
}

export const deleteImage = async (ctx: RouterContext) => {
	const identifier = ctx.params.filename;

	const count = await imageCollection.findOne({filename:identifier});

	if(!count){
		ctx.response.status = 404;
		ctx.response.body = {message: 'image does not exist'};
		return
	}else{
		console.log(count)

		if(ctx.request.headers.get("usercode")==count.usercode){
			const deleted = await imageCollection.deleteOne({_id:count._id})
			if(!deleted){
				ctx.response.status = 500;
			}else{
				await Deno.remove(`${Deno.env.get("IMAGEPATH")}${count.filename}`);
				ctx.response.status = 204
			}

		}else{
			ctx.response.body = {message: 'Unauthorized'};
			ctx.response.status = 401
		}
	}
}

export const uploadImage = async (ctx: RouterContext) => {
	const body = await ctx.request.body({ type: 'form-data'}).value;
	const formData = await body.read();

	const usercode = ctx.request.headers.get("usercode") ? ctx.request.headers.get("usercode") : "anonymous";
	
	let promises = [];
	let files = [];

	formData.files.forEach(file => promises.push(new Promise(async (resolve, reject)=>{
		if(!allowedFiletypes.get(file.contentType)){
			reject("rejected filetype")
		}else{
			const timestamp = new Date() 
			const hash = getFileHash(file.filename)

			const count = await imageCollection.findOne({hash:hash});

			if(!count){
				const newFilename = `${timestamp.valueOf()}${allowedFiletypes.get(file.contentType)}`
				copy(file.filename, `${Deno.env.get("IMAGEPATH")}${newFilename}`, {overwrite: true})
				const id = await imageCollection.insertOne({
					hash:hash,
					mime:file.contentType,
					filename:newFilename,
					usercode:usercode,
					time:timestamp
				});

				files.push(newFilename)
				resolve(newFilename)
			}else{
				files.push(count.filename)
				resolve(count.filename)
			}
		}
	})))

	const result = await Promise.allSettled(promises)
	
	const rejected = await result.filter(obj => Object.keys(obj).some(key => obj[key].includes("rejected")))	

	if(rejected.length >= 1){
		ctx.response.status = 405;
		ctx.response.body = {message:rejected[0].reason}
	}else{
		if(files.length > 1){
			ctx.response.body = files
		}else{
			ctx.response.body = {"img":files[0]}
		}

		ctx.response.status = 201
	}
}