#!/bin/bash
# This file is in the public domain.
#
# This script configure and launches libeufin-bank.
# The setup provides the admin account at the bank, and
# another account for the exchange at the bank.
#
# The environment must provide the following variables:
# - BANK_ADMIN_PASSWORD: password of the Netzbon administrator.
# - BANK_EXCHANGE_PASSWORD: password of the exchange
#     bank account hosted at Sandbox.  The related
#     username is: exchange-at-sandbox
# - BANK_NAME: human-readable name for the bank
# - DOMAIN_NAME: DNS domain name to use for the setup
# - ENABLE_TLS (http or https?)
#
# OUTPUTS:
#
# EXCHANGE_PAYTO -- payto-URI of the exchange
# EXCHANGE_WIRE_GATEWAY_URL -- URL of the wire gateway for the exchange

set -eu

source functions.sh
source config/user.conf
source config/internal.conf

if test -z "${BANK_NAME:-}"; then
  say "Error: config/user.conf does not specify BANK_NAME"
  exit 1
fi
if test -z "${DOMAIN_NAME:-}"; then
  say "Error: config/user.conf does not specify DOMAIN_NAME"
  exit 1
fi
if test -z "${BANK_ADMIN_PASSWORD:-}"; then
  say "Error: config/user.conf does not specify BANK_ADMIN_PASSWORD"
  exit 1
fi
if test -z "${BANK_EXCHANGE_PASSWORD:-}"; then
  say "Error: config/user.conf does not specify BANK_EXCHANGE_PASSWORD"
  exit 1
fi

say "Configure the bank with ${CURRENCY}..."

cat <<EOF > /etc/libeufin/libeufin-bank.conf
[libeufin-bank]
CURRENCY=${CURRENCY}
DEFAULT_EXCHANGE=${PROTO}://exchange.${DOMAIN_NAME}
DEFAULT_ADMIN_DEBT_LIMIT=${CURRENCY}:20000000
DEFAULT_CUSTOMER_DEBT_LIMIT=${CURRENCY}:0
SERVE=tcp
PORT=${BANK_PORT}
ALLOW_CONVERSION=yes
FIAT_CURRENCY=${FIAT_CURRENCY} 
TAN_SMS=libeufin-tan-sms.sh
TAN_EMAIL=libeufin-tan-email.sh

[CURRENCY-NETZBON]
enabled=yes
name=NetzBon
code=NETZBON
fractional_input_digits=2
fractional_normal_digits=2
fractional_trailing_zero_digits=2
alt_unit_names={"0":"NETZBON"}

EOF

# FIXME: include this in the bank _and_ make sure it gets loaded

say "Setting up libeufin-bank admin account..."
sudo -u libeufin-bank \
  libeufin-bank passwd \
  -c /etc/libeufin/libeufin-bank.conf \
  admin "${BANK_ADMIN_PASSWORD}"

say "Setting up admin's debt limit..."
sudo -u libeufin-bank \
  libeufin-bank edit-account \
  -c /etc/libeufin/libeufin-bank.conf \
  --debit_threshold=${CURRENCY}:200000000 admin

say "Setting up SPA configuration..."
echo "settings = { bankName: \"${BANK_NAME}\" }" >/etc/libeufin/settings.js

say "Create exchange account..."
if test -z "${EXCHANGE_PAYTO:-}"; then
  EXCHANGE_PAYTO_NEW="$(sudo -u libeufin-bank libeufin-bank create-account -c /etc/libeufin/libeufin-bank.conf '{"username":"exchange","password":"'${BANK_EXCHANGE_PASSWORD}'","name":"Exchange","is_taler_exchange":true}')?receiver-name=Exchange"
  echo "EXCHANGE_PAYTO=\"${EXCHANGE_PAYTO_NEW}\"" >> config/internal.conf
fi

if test -z "${EXCHANGE_WIRE_GATEWAY_URL:-}"; then
  EXCHANGE_WIRE_GATEWAY_URL_NEW="${PROTO}://bank.$DOMAIN_NAME/accounts/exchange/taler-wire-gateway/"
  echo "EXCHANGE_WIRE_GATEWAY_URL=\"${EXCHANGE_WIRE_GATEWAY_URL_NEW}\"" >> config/internal.conf
fi

say "Create merchant account..."
if test -z "${MERCHANT_PAYTO:-}"; then
  MERCHANT_PAYTO_NEW="$(sudo -u libeufin-bank libeufin-bank create-account '{"username":"merchant","password":"'${BANK_MERCHANT_PASSWORD}'","name":"Merchant","is_taler_exchange":false}')?receiver-name=Merchant"
  echo "MERCHANT_PAYTO=\"${MERCHANT_PAYTO_NEW}\"" >> config/internal.conf
fi

say "Start the bank..."
systemctl enable --now libeufin-bank

say "Waiting for the bank (/config)..."
curl --max-time 2 \
  --retry-all-errors \
  --retry-delay 4 \
  --retry 10 \
  ${PROTO}://bank.${DOMAIN_NAME}/config
say "DONE"

say "Setting conversion figures..."

curl -u "admin:${BANK_ADMIN_PASSWORD}" \
  -H 'Content-Type: application/json; charset=utf-8' \
  ${PROTO}://bank.${DOMAIN_NAME}/conversion-info/conversion-rate \
--data-binary @- << EOF
{
    "cashin_ratio": "1",
    "cashin_fee": "${CURRENCY}:0",
    "cashin_tiny_amount": "${CURRENCY}:01",
    "cashin_rounding_mode": "nearest",
    "cashin_min_amount": "${FIAT_CURRENCY}:1",
    "cashout_ratio": "1",
    "cashout_fee": "${FIAT_CURRENCY}:0",
    "cashout_tiny_amount": "${FIAT_CURRENCY}:0",
    "cashout_rounding_mode": "zero",
    "cashout_min_amount": "${CURRENCY}:1"
}
EOF
say "DONE"