#!/usr/bin/env bash
#
# Edit the values in this section, then run:
#   ./launch.sh
#
# Command-line arguments passed to this launcher are appended to the generated
# command, so they can deliberately override a setting below when needed.

set -euo pipefail

# Required for the nginx/Let's Encrypt setup.
LWD_HOSTNAME="<your-lightwalletd-domain>"
LETS_ENCRYPT_EMAIL="<your-email@example.com>"
ENABLE_LETS_ENCRYPT=true

# Lightwalletd listener and data locations.
GRPC_BIND_ADDR="127.0.0.1:9067"
HTTP_BIND_ADDR="127.0.0.1:9068"
DATA_DIR="/var/lib/lightwalletd"
# Leave false for the normal all-CPU build behavior. Set true on a small VPS
# if Pirate's C++ compiler is killed for lack of RAM.
LOW_MEMORY=false

# Optional Insight explorer. Leave blank to skip it.
EXPLORER_HOSTNAME=""

# Optional authoritative DNS seed. Fill in all three values to enable it.
# The DNS seed can use the same VPS as lightwalletd, but should use its own
# hostname/zone. DNSSEED_HOST is the zone queried by Pirate clients, while
# DNSSEED_NS is the authoritative nameserver hostname for that zone. Example:
#   DNSSEED_HOST="dnsseed.example.com"
#   DNSSEED_NS="ns-dnsseed.example.com"
# Create an A/AAAA record for DNSSEED_NS pointing to the VPS, then delegate
# DNSSEED_HOST to it with an NS record at your DNS provider.
DNSSEED_HOST=""
DNSSEED_NS=""
# DNSSEED_MBOX is the SOA responsible mailbox (RNAME), encoded as DNS text.
# Replace the @ in an email with a dot: admin@example.com becomes
# admin.example.com. Do not enter a literal email address here.
DNSSEED_MBOX=""

# Optional Pirate 6.0.3+ support for operator-managed blocknotify/alertnotify
# commands. Leave false unless your PIRATE.conf intentionally uses either.
ENABLE_SYSTEM_COMMAND=false

# Add any less-common setup-arrr-lightwalletd.sh options here. Examples:
# EXTRA_ARGS=(--dnsseed-port 5353 --p2p-port 45452)
EXTRA_ARGS=()

script_source="${BASH_SOURCE[0]:-$0}"
script_dir=$(cd -- "$(dirname -- "$script_source")" && pwd)
setup_script="$script_dir/setup-arrr-lightwalletd.sh"

err() {
  printf 'ERROR: %s\n' "$*" >&2
  exit 1
}

is_boolean() {
  [ "$1" = true ] || [ "$1" = false ]
}

is_placeholder() {
  [[ "$1" == "<"*">" ]]
}

if [ "${1:-}" = --help ] || [ "${1:-}" = -h ]; then
  exec "$setup_script" --help
fi

[ -x "$setup_script" ] || err "Installer not found or not executable: $setup_script"
is_placeholder "$LWD_HOSTNAME" && err "Set LWD_HOSTNAME at the top of $0 before running it"
is_placeholder "$LETS_ENCRYPT_EMAIL" && err "Set LETS_ENCRYPT_EMAIL at the top of $0 before running it"
is_boolean "$ENABLE_LETS_ENCRYPT" || err "ENABLE_LETS_ENCRYPT must be true or false"
is_boolean "$ENABLE_SYSTEM_COMMAND" || err "ENABLE_SYSTEM_COMMAND must be true or false"
is_boolean "$LOW_MEMORY" || err "LOW_MEMORY must be true or false"

if [ "$ENABLE_LETS_ENCRYPT" != true ]; then
  err "This launcher expects ENABLE_LETS_ENCRYPT=true; run the setup script directly for custom/direct TLS"
fi

if [ -n "$EXPLORER_HOSTNAME" ] && [ "$EXPLORER_HOSTNAME" = "$LWD_HOSTNAME" ]; then
  err "EXPLORER_HOSTNAME must differ from LWD_HOSTNAME"
fi

dnsseed_values=("$DNSSEED_HOST" "$DNSSEED_NS" "$DNSSEED_MBOX")
dnsseed_values_present=0
for value in "${dnsseed_values[@]}"; do
  if [ -n "$value" ]; then
    ((dnsseed_values_present += 1))
  fi
done
if [ "$dnsseed_values_present" -ne 0 ] && [ "$dnsseed_values_present" -ne 3 ]; then
  err "Set DNSSEED_HOST, DNSSEED_NS, and DNSSEED_MBOX together, or leave all three blank"
fi
if [[ "$DNSSEED_MBOX" == *"@"* ]]; then
  err "DNSSEED_MBOX is an SOA RNAME: use admin.example.com for admin@example.com"
fi

args=(
  --hostname "$LWD_HOSTNAME"
  --email "$LETS_ENCRYPT_EMAIL"
  --lets-encrypt
  --bind-addr "$GRPC_BIND_ADDR"
  --http-bind-addr "$HTTP_BIND_ADDR"
  --data-dir "$DATA_DIR"
)

if [ -n "$EXPLORER_HOSTNAME" ]; then
  args+=(--explorer-hostname "$EXPLORER_HOSTNAME")
fi
if [ "$dnsseed_values_present" -eq 3 ]; then
  args+=(
    --dnsseed-host "$DNSSEED_HOST"
    --dnsseed-ns "$DNSSEED_NS"
    --dnsseed-mbox "$DNSSEED_MBOX"
  )
fi
if [ "$ENABLE_SYSTEM_COMMAND" = true ]; then
  args+=(--enable-system-command)
fi
if [ "$LOW_MEMORY" = true ]; then
  args+=(--low-memory)
fi

printf 'Running: '
printf '%q ' "$setup_script" "${args[@]}" "${EXTRA_ARGS[@]}" "$@"
echo

exec "$setup_script" "${args[@]}" "${EXTRA_ARGS[@]}" "$@"