class LnurlpayController < ApplicationController
  before_action :find_user_by_address

  def index
    render json: {
      status: "OK",
      callback: "https://accounts.kosmos.org/lnurlpay/#{@user.address}/invoice",
      tag: "payRequest",
      maxSendable: 1000000 * 1000, # msat
      minSendable: 100 * 1000, # msat
      metadata: metadata(@user.address),
      commentAllowed: 0
    }
  end

  def invoice
    amount = params[:amount].to_i # msats
    address = params[:address]

    validate_amount(amount)

    payment_request = @user.ln_create_invoice({
      amount: amount / 1000, # we create invoices in sats
      description_hash: Digest::SHA2.hexdigest(metadata(address))
    })

    render json: {
      status: "OK",
      successAction: {
        tag: "message",
        message: "Sats received. Thank you!"
      },
      routes: [],
      pr: payment_request
    }
  end

  private

  def find_user_by_address
    address = params[:address].split("@")
    @user = User.where(cn: address.first, ou: address.last).first
    http_status :not_found if @user.nil?
  end

  def metadata(address)
    "[[\"text/identifier\", \"#{address}\"], [\"text/plain\", \"Send sats, receive thanks.\"]]"
  end

  def validate_amount(amount)
    if amount > 1000000 || amount < 1000
      render json: { status: "ERROR", reason: "Invalid amount" }
      return
    end
  end

end