import type { RequestHandler } from "./$types"

import { json, error } from "@sveltejs/kit"

import UserMgmt from "$lib/server/usermgmt"

import Util from "$lib/util"
import { DuplicateError, RegisterResponseCause } from "$lib/errors"

export const POST: RequestHandler = async ({ request }) => {
	
	const data = await request.formData()

	const email = data.get("email")
	const password = data.get("password")
	const display_name = data.get("display_name")

	if (data.keys.length > 3 || !(typeof email === "string" && typeof password === "string" && typeof display_name === "string")) {
		return error(400, { cause: RegisterResponseCause.MalformedRequest, message: "Invalid field arguments" })
	}
	if (email.length == 0) {
		return error(400, { cause: RegisterResponseCause.EmailLength, message: "email must not be empty" })
	}
	if (password.length == 0) {
		return error(400, { cause: RegisterResponseCause.PasswordLength, message: "password must not be empty" })
	}
	if (display_name.length == 0) {
		return error(400, { cause: RegisterResponseCause.DisplayNameLength, message: "Display name must not be empty" })
	}

	if (!Util.check_email_format(email)) {
		return error(400, { cause: RegisterResponseCause.EmailFormat, message: "invalid email format" })
	}
	
	try {
		const user = await UserMgmt.register(email, password, display_name)
	} catch (e) {
		if (e instanceof DuplicateError) {
			if (e.fields.includes("email")) {
				return error(409, { cause: RegisterResponseCause.EmailDuplicate, message: "email already in use" })
			}
		}

		return error(500, { cause: RegisterResponseCause.Server, message: "Server failed to create user"})
	}
	
	return json({})
}