#!/bin/bash

# Set up error handling

set -eu

notify_exit() {
  [[ $1 == 0 ]] || echo Script "$0" failed, exit code "$1"
}

notify_err() {
  echo "errexit on line $(caller)" >&2
}

trap '(exit 130)' INT
trap '(exit 143)' TERM
trap notify_err ERR
# shellcheck disable=SC2154
trap 'rc=$?; notify_exit $rc; exit $rc' EXIT

# End of error handling setup

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

say "Beginning Exchange setup"

# Required inputs:
#
# - LIBEUFIN_NEXUS_USERNAME (exchange username for libeufin-nexus)
# - NEXUS_EXCHANGE_PASSWORD (exchange password for libeufin-nexus)
# - WIRE_GATEWAY_URL (where is the exchange wire gateway / libeufin-nexus)
# - EXCHANGE_IBAN (exchange account IBAN)
# - EXCHANGE_PAYTO (exchange account PAYTO)
# - ENABLE_TLS (http or https?)

if test -z "${LIBEUFIN_NEXUS_USERNAME:-}"; then
  say "Failure: LIBEUFIN_NEXUS_USERNAME not set"
  exit 1
fi
if test -z "${NEXUS_EXCHANGE_PASSWORD:-}"; then
  say "Failure: NEXUS_EXCHANGE_PASSWORD not set"
  exit 1
fi
if test -z "${EXCHANGE_IBAN:-}"; then
  say "Failure: EXCHANGE_IBAN not set"
  exit 1
fi
if test -z "${WIRE_GATEWAY_URL:-}"; then
  say "Failure: WIRE_GATEWAY_URL not set"
  exit 1
fi
if test -z "${EXCHANGE_PAYTO:-}"; then
  say "Failure: EXCHANGE_PAYTO not set"
  exit 1
fi

function die() {
  say "$1"
  exit 1
}

# Just try if sudo works for diagnostics
sudo -i -u taler-exchange-offline id >/dev/null || die "Error: Unable to switch to taler-exchange-offline user"

# Create master key as taler-exchange-offline *unless* user already
# set the MASTER_PUBLIC_KEY to some value we can use.
export MASTER_PRIV_DIR=.local/share/taler/exchange/offline-keys
export MASTER_PRIV_FILE=${MASTER_PRIV_DIR}/master.priv
export SECMOD_TOFU_FILE=${MASTER_PRIV_DIR}/secm_tofus.pub
if test -z "${MASTER_PUBLIC_KEY:-}"; then
  if test "${DO_OFFLINE:-y}" == n; then
    say "Error: No MASTER_PUBLIC_KEY but DO_OFFLINE set to NO"
    exit 1
  fi
  say "Setting up offline key"
  echo -e "[exchange-offline]\n" \
    "MASTER_PRIV_FILE=\$HOME/${MASTER_PRIV_FILE}\n" \
    "SECM_TOFU_FILE=\$HOME/${SECMOD_TOFU_FILE}\n" \
    >/etc/taler/conf.d/offline-setup.conf

  MASTER_PUBLIC_KEY=$(sudo -i -u taler-exchange-offline taler-exchange-offline -LDEBUG setup)
  echo "MASTER_PUBLIC_KEY=\"${MASTER_PUBLIC_KEY}\"" >>config/user.conf
  if test -z "${DO_OFFLINE:-}"; then
    # Set 'DO_OFFLINE'
    DO_OFFLINE=y
    echo "DO_OFFLINE=y" >>config/user.conf
  fi
else
  say "Master public key is $MASTER_PUBLIC_KEY"
  if test ${DO_OFFLINE:-y} == y; then
    MASTER_PUBLIC_KEY2=$(sudo -i -u taler-exchange-offline taler-exchange-offline setup)
    if test "${MASTER_PUBLIC_KEY2}" != "${MASTER_PUBLIC_KEY}"; then
      say "Error: master public key missmatch ${MASTER_PUBLIC_KEY2} does not match ${MASTER_PUBLIC_KEY}"
      exit 1
    fi
  fi
fi

export MASTER_PUBLIC_KEY

say "Stopping running exchange before reconfiguration"
systemctl stop taler-exchange.target

say "Setting up exchange database"
EXCHANGE_DB=talerexchange
# Use "|| true" to continue if these already exist.
sudo -i -u postgres createuser -d taler-exchange-httpd || true
sudo -i -u postgres createuser taler-exchange-wire || true
sudo -i -u postgres createuser taler-exchange-closer || true
sudo -i -u postgres createuser taler-exchange-aggregator || true
sudo -i -u postgres createdb -O taler-exchange-httpd $EXCHANGE_DB || true

say "Configuring exchange"

if test "${ENABLE_TLS}" = "y"; then
  export EXCHANGE_BASE_URL="https://exchange.${DOMAIN_NAME}/"
else
  export EXCHANGE_BASE_URL="http://exchange.${DOMAIN_NAME}/"
fi

# Generate /etc/taler/conf.d/setup.conf
echo -e "[taler]\n" \
  "CURRENCY=${CURRENCY}\n" \
  "CURRENCY_ROUND_UNIT=${CURRENCY}:0.01\n" \
  "AML_THRESHOLD=${CURRENCY}:1000000\n" \
  "\n[exchange]\n" \
  "MASTER_PUBLIC_KEY=${MASTER_PUBLIC_KEY}\n" \
  "BASE_URL=${EXCHANGE_BASE_URL}\n" \
  "\n[merchant-exchange-${DOMAIN_NAME}]\n" \
  "MASTER_KEY=${MASTER_PUBLIC_KEY}\n" \
  "CURRENCY=${CURRENCY}\n" \
  "EXCHANGE_BASE_URL=${EXCHANGE_BASE_URL}\n" \
  "\n[exchange-account-default]\n" \
  "PAYTO_URI=${EXCHANGE_PAYTO}\n" \
  "ENABLE_DEBIT=YES\n" \
  "ENABLE_CREDIT=YES\n" \
  "@inline-secret@ exchange-accountcredentials-default ../secrets/exchange-accountcredentials-default.secret.conf\n" \
  >/etc/taler/conf.d/setup.conf

echo -e "[exchangedb-postgres]\n" \
  "CONFIG=postgres:///${EXCHANGE_DB}\n" \
  >/etc/taler/secrets/exchange-db.secret.conf
chmod 440 /etc/taler/secrets/exchange-db.secret.conf
chown root:taler-exchange-db /etc/taler/secrets/exchange-db.secret.conf

echo -e "[exchange-accountcredentials-default]\n" \
  "WIRE_GATEWAY_URL=${WIRE_GATEWAY_URL}\n" \
  "WIRE_GATEWAY_AUTH_METHOD=basic\n" \
  "USERNAME=${LIBEUFIN_NEXUS_USERNAME}\n" \
  "PASSWORD=${NEXUS_EXCHANGE_PASSWORD}\n" \
  >/etc/taler/secrets/exchange-accountcredentials-default.secret.conf
chmod 400 /etc/taler/secrets/exchange-accountcredentials-default.secret.conf
chown taler-exchange-wire:taler-exchange-db /etc/taler/secrets/exchange-accountcredentials-default.secret.conf

taler-harness deployment gen-coin-config \
  --min-amount "${CURRENCY}":0.01 \
  --max-amount "${CURRENCY}":100 |
  sed -e "s/FEE_DEPOSIT = ${CURRENCY}:0.01/FEE_DEPOSIT = ${CURRENCY}:0/" \
    >/etc/taler/conf.d/"${CURRENCY}"-coins.conf

# FIXME-DOLD: this belongs with taler-harness
for SEC in $(taler-config -c /etc/taler/conf.d/"${CURRENCY}"-coins.conf -S | grep COIN-); do
  taler-config -c /etc/taler/conf.d/"${CURRENCY}"-coins.conf -s "$SEC" -o CIPHER -V "RSA"
done

say "Initializing exchange database"
sudo -u taler-exchange-httpd taler-exchange-dbinit -c /etc/taler/taler.conf

echo 'GRANT USAGE ON SCHEMA exchange TO "taler-exchange-wire";' | sudo -i -u postgres psql -f - ${EXCHANGE_DB}
echo 'GRANT SELECT,INSERT,UPDATE,DELETE ON ALL TABLES IN SCHEMA exchange TO "taler-exchange-wire";' | sudo -i -u postgres psql -f - ${EXCHANGE_DB}
echo 'GRANT USAGE ON SCHEMA _v TO "taler-exchange-wire";' | sudo -i -u postgres psql -f - ${EXCHANGE_DB}
echo 'GRANT SELECT ON ALL TABLES IN SCHEMA _v TO "taler-exchange-wire";' | sudo -i -u postgres psql -f - ${EXCHANGE_DB}

echo 'GRANT USAGE ON SCHEMA exchange TO "taler-exchange-closer";' | sudo -i -u postgres psql -f - ${EXCHANGE_DB}
echo 'GRANT SELECT,INSERT,UPDATE,DELETE ON ALL TABLES IN SCHEMA exchange TO "taler-exchange-closer";' | sudo -i -u postgres psql -f - ${EXCHANGE_DB}
echo 'GRANT USAGE ON SCHEMA _v TO "taler-exchange-closer";' | sudo -i -u postgres psql -f - ${EXCHANGE_DB}
echo 'GRANT SELECT ON ALL TABLES IN SCHEMA _v TO "taler-exchange-closer";' | sudo -i -u postgres psql -f - ${EXCHANGE_DB}

echo 'GRANT USAGE ON SCHEMA exchange TO "taler-exchange-aggregator";' | sudo -i -u postgres psql -f - ${EXCHANGE_DB}
echo 'GRANT SELECT,INSERT,UPDATE,DELETE ON ALL TABLES IN SCHEMA exchange TO "taler-exchange-aggregator";' | sudo -i -u postgres psql -f - ${EXCHANGE_DB}
echo 'GRANT USAGE ON SCHEMA _v TO "taler-exchange-aggregator";' | sudo -i -u postgres psql -f - ${EXCHANGE_DB}
echo 'GRANT SELECT ON ALL TABLES IN SCHEMA _v TO "taler-exchange-aggregator";' | sudo -i -u postgres psql -f - ${EXCHANGE_DB}

say "Launching exchange"
systemctl enable --now taler-exchange.target

say "Waiting for exchange HTTP service (/config)..."
curl --max-time 2 \
  --retry-connrefused \
  --retry-delay 1 \
  --retry 10 \
  "${EXCHANGE_BASE_URL}"config &>/dev/null
say "DONE"

say "Waiting for exchange management keys (this may take a while)..."
curl --max-time 30 \
  --retry-delay 1 \
  --retry 60 \
  "${EXCHANGE_BASE_URL}"management/keys &>/dev/null
say "DONE"

if test ${DO_OFFLINE} == y; then
  say "Offline interaction..."

  sudo -i -u taler-exchange-offline \
    taler-exchange-offline \
    -c /etc/taler/taler.conf \
    download \
    sign \
    upload

  sudo -i -u taler-exchange-offline \
    taler-exchange-offline \
    enable-account "${EXCHANGE_PAYTO}" \
    wire-fee now iban "${CURRENCY}":0 "${CURRENCY}":0 \
    global-fee now "${CURRENCY}":0 "${CURRENCY}":0 "${CURRENCY}":0 1h 6a 0 \
    upload
fi

say "Waiting for exchange /keys..."
curl --max-time 2 \
  --retry-connrefused \
  --retry-delay 1 \
  --retry 10 \
  "${EXCHANGE_BASE_URL}"keys &>/dev/null
say "DONE"

say "Exchange setup finished"