#!/usr/bin/env bash
set -Eeuo pipefail

usage() {
  echo "usage: install-jd-language-primary-target.sh <guanghu-os-source> <source-commit>" >&2
  exit 64
}

test "$#" = 2 || usage
test "${EUID}" = 0 || exit 77

source_root="$(readlink -f "$1")"
source_commit=$2
expected_machine_id="caa7b1019517470f9d1368b6e79db49e"
expected_instance_id="f3d4b730-7f02-452f-975b-7091a4800431"
install_root="/usr/local/libexec/guanghu-os"
state_root="/var/lib/guanghu/language-primary"
receipt_root="${state_root}/receipts"
backup_root="${state_root}/backups/${source_commit}"
previous_default="$(systemctl get-default)"
installed=0
default_changed=0

[[ ${source_commit} =~ ^[0-9a-f]{40}$ ]]
test -f "${source_root}/.guanghu-source-commit"
test "$(cat "${source_root}/.guanghu-source-commit")" = "${source_commit}"
test "$(cat /etc/machine-id)" = "${expected_machine_id}"
test "$(tr '[:upper:]' '[:lower:]' </sys/class/dmi/id/product_uuid)" = \
  "${expected_instance_id}"
test -f "${source_root}/packaging/systemd/guanghu-language-primary.target"
test -f "${source_root}/packaging/systemd/guanghu-world-gate.service"
test -f "${source_root}/packaging/systemd/guanghu-boot-acceptance.service"
test -f "${source_root}/scripts/verify-jd-language-primary-world.sh"
test -f "${source_root}/scripts/verify-jd-language-primary-acceptance.sh"
test "${previous_default}" = graphical.target
test ! -e "${backup_root}"

/guanghu/bin/ghctl authorize /guanghu/current install_world_version |
  grep -q '^GUANGHU_ACTION_AUTHORIZED$'

for path in \
  /etc/systemd/system/guanghu-language-primary.target \
  /etc/systemd/system/guanghu-world-gate.service \
  /etc/systemd/system/guanghu-boot-acceptance.service \
  "${install_root}/verify-jd-language-primary-world" \
  "${install_root}/verify-jd-language-primary-acceptance"; do
  test ! -e "${path}"
done

rollback() {
  if test "${default_changed}" = 1; then
    systemctl set-default "${previous_default}" >/dev/null || true
  fi
  if test "${installed}" = 1; then
    systemctl stop guanghu-language-primary.target \
      guanghu-boot-acceptance.service guanghu-world-gate.service \
      >/dev/null 2>&1 || true
    rm -f \
      /etc/systemd/system/guanghu-language-primary.target \
      /etc/systemd/system/guanghu-world-gate.service \
      /etc/systemd/system/guanghu-boot-acceptance.service \
      "${install_root}/verify-jd-language-primary-world" \
      "${install_root}/verify-jd-language-primary-acceptance"
    systemctl daemon-reload || true
  fi
}
trap rollback ERR

install -d -o root -g root -m 0755 "${install_root}"
install -d -o root -g root -m 0700 \
  "${receipt_root}" "${backup_root}"
printf '%s\n' "${previous_default}" >"${backup_root}/previous-default-target"

install -o root -g root -m 0644 \
  "${source_root}/packaging/systemd/guanghu-language-primary.target" \
  /etc/systemd/system/guanghu-language-primary.target
install -o root -g root -m 0644 \
  "${source_root}/packaging/systemd/guanghu-world-gate.service" \
  /etc/systemd/system/guanghu-world-gate.service
install -o root -g root -m 0644 \
  "${source_root}/packaging/systemd/guanghu-boot-acceptance.service" \
  /etc/systemd/system/guanghu-boot-acceptance.service
install -o root -g root -m 0755 \
  "${source_root}/scripts/verify-jd-language-primary-world.sh" \
  "${install_root}/verify-jd-language-primary-world"
install -o root -g root -m 0755 \
  "${source_root}/scripts/verify-jd-language-primary-acceptance.sh" \
  "${install_root}/verify-jd-language-primary-acceptance"
installed=1

systemctl daemon-reload
systemctl start guanghu-language-primary.target
test "$(systemctl is-active guanghu-language-primary.target)" = active
test "$(systemctl is-active guanghu-world-gate.service)" = active
test "$(systemctl is-active guanghu-boot-acceptance.service)" = active

systemctl set-default guanghu-language-primary.target >/dev/null
default_changed=1
test "$(systemctl get-default)" = guanghu-language-primary.target

boot_id="$(cat /proc/sys/kernel/random/boot_id)"
boot_receipt="${receipt_root}/JD-FD-PRIMARY-LANGUAGE-PRIMARY-BOOT-${boot_id}.json"
test -f "${boot_receipt}"
jq -e '.result == "PASS_100" and .boot_changed == false' \
  "${boot_receipt}" >/dev/null

install_receipt="${receipt_root}/JD-FD-PRIMARY-LANGUAGE-PRIMARY-INSTALL-${source_commit}.json"
jq -n \
  --arg source_commit "${source_commit}" \
  --arg previous_default "${previous_default}" \
  --arg boot_receipt "${boot_receipt}" \
  --arg observed_at "$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
  '{
    schema: "guanghu.language-primary-install-receipt/v1",
    receipt_id: ("JD-FD-PRIMARY-LANGUAGE-PRIMARY-INSTALL-" + $source_commit),
    target_node_id: "JD-FD-PRIMARY",
    source_repository: "REPO-014",
    source_commit: $source_commit,
    previous_default_target: $previous_default,
    current_default_target: "guanghu-language-primary.target",
    boot_receipt: $boot_receipt,
    control_role: "GUANGHU_OS_LANGUAGE_PRIMARY",
    linux_role: "COOPERATIVE_EXECUTION_AND_RESCUE_SUBSTRATE",
    native_candidate_preserved: true,
    disk_or_bootloader_changed: false,
    rollback: ("systemctl set-default " + $previous_default),
    observed_at: $observed_at,
    result: "PASS_100"
  }' >"${install_receipt}.tmp"
chmod 0600 "${install_receipt}.tmp"
mv "${install_receipt}.tmp" "${install_receipt}"

trap - ERR
printf 'PASS_100 target=guanghu-language-primary.target receipt=%s\n' \
  "${install_receipt}"