#!/bin/bash
# This file is in the public domain.
#
# This script configure and launches Sandbox and Nexus.
# The setup provides the admin account at Sandbox, and
# another account for the exchange at Nexus and Sandbox.
# A Taler facade to serve taler-wire-gateway requests
# is also provided.  The currency defaults to "NB".

# The environment must provide the following variables:
# - SANDBOX_ADMIN_PASSWORD: password of the Netzbon administrator.
# - NEXUS_EXCHANGE_PASSWORD: password of the Nexus user hosted
#     at Nexus, this password will let the Wire-gateway access
#     its banking records.  The related username is:
#     exchange-at-nexus
# - SANDBOX_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
#
# OUTPUTS:
#
# LIBEUFIN_NEXUS_USERNAME -- username of the exchange
# EXCHANGE_IBAN -- IBAN of the exchange
# EXCHANGE_PAYTO -- payto-URI of 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 "${SANDBOX_ADMIN_PASSWORD:-}"; then
  say "Error: config/user.conf does not specify SANDBOX_ADMIN_PASSWORD"
  exit 1
fi

# TODO: add sanity-checks for presence of other required env-vars

if test "${ENABLE_TLS:-}" == "y"; then
  PROTO="https"
else
  PROTO="http"
fi

say "Setting up libeufin"

# EBICS parameters that must match but are only used internally.
EBICS_HOST_ID="TALERHOST"
EBICS_PARTNER_ID="talerop"
EBICS_USER_ID="exchangeebics"
EBICS_CONNECTION_NAME="exchangeconn"
LIBEUFIN_TALER_FACADE="taler-facade"
export LIBEUFIN_NEXUS_USERNAME="exchange-at-nexus"
echo "LIBEUFIN_NEXUS_USERNAME=\"${LIBEUFIN_NEXUS_USERNAME}\"" >>config/internal.conf

# Load configuration with
# LIBEUFIN_NEXUS_DB_CONNECTION and
# LIBEUFIN_NEXUS_PORT
# shellcheck disable=SC1091
source /etc/libeufin/nexus.env
export LIBEUFIN_NEXUS_DB_CONNECTION

if test -z "${LIBEUFIN_NEXUS_DB_CONNECTION:-}"; then
  say "Error: /etc/libeufin/nexus.env does not specify LIBEUFIN_NEXUS_DB_CONNECTION"
  exit 1
fi

export LIBEUFIN_NEXUS_PASSWORD=$NEXUS_EXCHANGE_PASSWORD
export LIBEUFIN_NEXUS_URL="http://localhost:${LIBEUFIN_NEXUS_PORT}"

# Load configuration with
# LIBEUFIN_SANDBOX_DB_CONNECTION and
# LIBEUFIN_SANDBOX_PORT
# shellcheck disable=SC1091
. /etc/libeufin/sandbox.env
export LIBEUFIN_SANDBOX_DB_CONNECTION

if test -z "${LIBEUFIN_SANDBOX_DB_CONNECTION:-}"; then
  say "Error: /etc/libeufin/sandbox.env does not specify LIBEUFIN_SANDBOX_DB_CONNECTION"
  exit 1
fi

export LIBEUFIN_SANDBOX_ADMIN_PASSWORD="${SANDBOX_ADMIN_PASSWORD}"
# FIXME-CG: this should be done inside the Debian package (incl. pw generation)
# We need to add this password to the systemd environment to make it effective.
echo "LIBEUFIN_SANDBOX_ADMIN_PASSWORD=\"${SANDBOX_ADMIN_PASSWORD}\"" >>/etc/libeufin/sandbox.env

SANDBOX_URL="http://localhost:${LIBEUFIN_SANDBOX_PORT}/"

say "Configure the default demobank with ${CURRENCY}..."
MY_DIR=$PWD

# Go to directory valid for other users.
cd /
sudo -E -u libeufin-sandbox \
  libeufin-sandbox config \
  --captcha-url "${PROTO}://bank.${DOMAIN_NAME}" \
  --bank-debt-limit 1000000 \
  --users-debt-limit 0 \
  --without-signup-bonus \
  --currency "${CURRENCY}" \
  default
say "DONE"
say "Start the bank..."
systemctl enable --now libeufin-sandbox

say "DONE"
say "Waiting for sandbox..."
curl --max-time 25 \
  --retry-connrefused \
  --retry-delay 3 \
  --retry 10 \
  "${SANDBOX_URL}" &>/dev/null
say "DONE"

say "Make one superuser at Nexus..."
sudo -E -u libeufin-nexus libeufin-nexus superuser \
  ${LIBEUFIN_NEXUS_USERNAME} \
  --password "$NEXUS_EXCHANGE_PASSWORD"
say "DONE"
say "Launching Nexus..."

systemctl enable --now libeufin-nexus

say "DONE"
say "Waiting for Nexus..."
curl --max-time 25 \
  --retry-connrefused \
  --retry-delay 3 \
  --retry 10 \
  "${LIBEUFIN_NEXUS_URL}" &>/dev/null
say "DONE"

EXCHANGE_SANDBOX_USERNAME="exchange-at-sandbox"
say "Register the exchange Sandbox account..."
export LIBEUFIN_SANDBOX_USERNAME=$EXCHANGE_SANDBOX_USERNAME
export LIBEUFIN_SANDBOX_PASSWORD="${SANDBOX_EXCHANGE_PASSWORD}"
# Succeed also if the account already exists...
# (hopefully with the same password!)
# FIXME-MS: might be better to DELETE an existing
# account here instead!??
libeufin-cli \
  sandbox --sandbox-url "${SANDBOX_URL}" \
  demobank register || true
say "DONE"

say "Getting the exchange IBAN and Payto URI..."
EXCHANGE_DETAILS=$(libeufin-cli \
  sandbox --sandbox-url "${SANDBOX_URL}" \
  demobank info --bank-account ${LIBEUFIN_SANDBOX_USERNAME})
say "DONE"

EXCHANGE_IBAN=$(echo "$EXCHANGE_DETAILS" | jq -r .iban)
EXCHANGE_PAYTO=$(echo "$EXCHANGE_DETAILS" | jq -r .paytoUri)

# Communicating this to the exchange script, as the exchange
# needs it for the /wire response.
export EXCHANGE_IBAN
export EXCHANGE_PAYTO
echo "EXCHANGE_IBAN=\"${EXCHANGE_IBAN}\"" >>"${MY_DIR}"/config/internal.conf
echo "EXCHANGE_PAYTO=\"${EXCHANGE_PAYTO}\"" >>"${MY_DIR}"/config/internal.conf

say "Setting the default exchange at Sandbox..."
libeufin-sandbox default-exchange "${PROTO}://exchange.$DOMAIN_NAME/" "$EXCHANGE_PAYTO"
say "DONE"

export LIBEUFIN_SANDBOX_USERNAME="admin"
export LIBEUFIN_SANDBOX_PASSWORD=$SANDBOX_ADMIN_PASSWORD
say "Create EBICS host at Sandbox..."
# Continue on failure, request is not idempotent...
# FIXME-MS: might be nicer to delete existing host first.
libeufin-cli sandbox \
  --sandbox-url "${SANDBOX_URL}" \
  ebicshost create --host-id ${EBICS_HOST_ID} || true
say "OK"

say "Create exchange EBICS subscriber at Sandbox..."
# Continue on failure, request is not idempotent...
# FIXME-MS: might be nicer to delete existing host first.
libeufin-cli sandbox \
  --sandbox-url "${SANDBOX_URL}" \
  demobank new-ebicssubscriber \
  --host-id ${EBICS_HOST_ID} \
  --user-id ${EBICS_USER_ID} \
  --partner-id ${EBICS_PARTNER_ID} \
  --bank-account ${EXCHANGE_SANDBOX_USERNAME} || true
say "OK"

say "Creating the EBICS connection at Nexus..."
# Continue on failure, request is not idempotent...
# FIXME-MS: might be nicer to delete existing host first.
libeufin-cli connections new-ebics-connection \
  --ebics-url "${SANDBOX_URL}ebicsweb" \
  --host-id ${EBICS_HOST_ID} \
  --partner-id ${EBICS_PARTNER_ID} \
  --ebics-user-id ${EBICS_USER_ID} \
  ${EBICS_CONNECTION_NAME} || true
say "DONE"

say "Setup EBICS keying..."
libeufin-cli connections connect ${EBICS_CONNECTION_NAME} >/dev/null
say "OK"

say "Download bank account name from Sandbox..."
libeufin-cli connections download-bank-accounts ${EBICS_CONNECTION_NAME}
say "OK"

say "Importing bank account info into Nexus..."
# Continue on failure, request is not idempotent...
# FIXME-MS: might be nicer to delete existing connection first.
libeufin-cli connections import-bank-account \
  --offered-account-id ${EXCHANGE_SANDBOX_USERNAME} \
  --nexus-bank-account-id ${LIBEUFIN_NEXUS_USERNAME} \
  ${EBICS_CONNECTION_NAME} || true
echo "OK"

say "Create the Taler facade at Nexus..."
# Continue on failure, request is not idempotent...
# FIXME-MS: might be nicer to delete existing facade first.
libeufin-cli facades \
  new-taler-wire-gateway-facade \
  --currency "$CURRENCY" \
  --facade-name ${LIBEUFIN_TALER_FACADE} \
  ${EBICS_CONNECTION_NAME} ${LIBEUFIN_NEXUS_USERNAME} || true
say "OK"

export WIRE_GATEWAY_URL="${LIBEUFIN_NEXUS_URL}/facades/${LIBEUFIN_TALER_FACADE}/taler-wire-gateway/"
echo "WIRE_GATEWAY_URL=\"${WIRE_GATEWAY_URL}\"" >>"${MY_DIR}"/config/internal.conf

say "Configuring the background jobs to submit/get transactions..."
# Tries every second.
# Not idempotent, FIXME #7739
libeufin-cli accounts task-schedule \
  --task-type submit \
  --task-name exchange-payments \
  --task-cronspec "* * *" \
  exchange-at-nexus || true
say "OK"

# Tries every second.  Ask C52
say "Setup history fetch task.."
# Not idempotent, FIXME #7739
libeufin-cli accounts task-schedule \
  --task-type fetch \
  --task-name exchange-history \
  --task-cronspec "* * *" \
  --task-param-level report \
  --task-param-range-type latest \
  exchange-at-nexus || true
say "OK"

say "Setting up SPA configuration..."

# shellcheck disable=SC2002
cat /usr/share/libeufin/demobank-ui/demobank-ui-settings.js |
  sed -e "s/localhost/bank.${DOMAIN_NAME}/g" |
  sed -e "s/Taler Bank/${BANK_NAME}/g" \
    >/etc/libeufin/demobank-ui-settings.js

say "DONE"