# Cases for ./grafana-secret-key.nix. Each case sets up the store's leaf, the
# seed file and the stub's behaviour, runs `grafana_secret_key` the way the
# unit's script does, and compares its status, the key it hands over and what
# the store holds afterwards.
set -uo pipefail

failures=0
leaf=secret/swarm/services/t/secret-key

# setup <description>
setup() {
  case=$1
  dir=$(mktemp -d)
  mkdir "$dir/kv"
  export FAKE_BAO_KV=$dir/kv FAKE_BAO_LOG=$dir/bao.log FAKE_BAO_LOGIN_RC=0
  unset FAKE_BAO_DENY_READ FAKE_BAO_DENY_WRITE FAKE_BAO_RACE
  : >"$FAKE_BAO_LOG"
  seed=$dir/secret_key
  stored=$FAKE_BAO_KV/$(printf '%s' "$leaf" | tr / _)
}

mint() {
  printf 'minted-key\n'
}

# expect <status> <key> <what the store holds, "" for nothing>
expect() {
  (
    PATH="$FAKE_BAO_BIN:$PATH"
    unset BAO_TOKEN
    # shellcheck source=/dev/null
    . "$HELPER"
    rc=0
    grafana_secret_key "$leaf" "$seed" mint >/dev/null 2>"$dir/err" || rc=$?
    printf '%s' "$rc" >"$dir/rc"
    printf '%s' "$GRAFANA_KEY" >"$dir/key"
  )
  held=$(cat "$stored" 2>/dev/null)
  if [ "$(cat "$dir/rc")" != "$1" ]; then fail "exited $(cat "$dir/rc"), wanted $1: $(cat "$dir/err")"; fi
  if [ "$(cat "$dir/key")" != "$2" ]; then fail "handed over '$(cat "$dir/key")', wanted '$2'"; fi
  if [ "$held" != "$3" ]; then fail "the store holds '$held', wanted '$3'"; fi
}

fail() {
  echo "FAILED: $case: $*" >&2
  failures=$((failures + 1))
}

setup "an empty store takes the seed's key"
printf 'seed-key\n' >"$seed"
expect 0 seed-key seed-key
grep -q '^kv put -cas=0 ' "$FAKE_BAO_LOG" || fail "no create-only write"
[ -e "$seed" ] || fail "the seed file was removed"

setup "a store that holds a key wins over the seed, and is not written"
printf 'seed-key\n' >"$seed"
printf 'store-key' >"$stored"
expect 0 store-key store-key
! grep -q '^kv put' "$FAKE_BAO_LOG" || fail "wrote to the store"

setup "with no seed and an empty store, a key is minted and stored"
expect 0 minted-key minted-key

setup "a store that refuses the login mints nothing, with or without a seed"
export FAKE_BAO_LOGIN_RC=1
expect 1 "" ""
printf 'seed-key\n' >"$seed"
expect 1 "" ""

setup "a store that refuses the read stores and hands over nothing"
printf 'seed-key\n' >"$seed"
export FAKE_BAO_DENY_READ=1
expect 1 "" seed-key

setup "a store that refuses the write hands over nothing"
export FAKE_BAO_DENY_WRITE=1
expect 1 "" ""

setup "a store that holds an empty value hands over nothing"
: >"$stored"
expect 1 "" ""

setup "a lost race takes the winner's key"
printf 'seed-key\n' >"$seed"
export FAKE_BAO_RACE=other-key
expect 0 other-key other-key

echo "$failures failures"
[ "$failures" = 0 ]