#!/bin/bash

set -eu

hook=$(pwd)/resources/com/google/gerrit/server/tools/root/hooks/commit-msg

cd $TEST_TMPDIR

function fail {
  echo "FAIL: $1"
  exit 1
}

function prereq_modern_git {
  # "git interpret-trailers --where" was introduced in Git 2.15.0.
  git interpret-trailers -h 2>&1 | grep -e --where > /dev/null
}

function test_nonexistent_argument {
  rm -f input
  if ${hook} input ; then
    fail "must fail for non-existent input"
  fi
}

function test_empty {
  rm -f input
  touch input
  if ${hook} input ; then
    fail "must fail on empty message"
  fi
}

function test_empty_with_comments {
  rm -f input
  cat << EOF > input
# comment

# comment2
EOF
  if ${hook} input ; then
    fail "must fail on empty message"
  fi
}

function test_keep_cutoff_line {
  if ! prereq_modern_git ; then
    echo "old version of Git detected; skipping scissors test."
    return 0
  fi
  rm -f input
  cat << EOF > input
Do something nice

# Please enter the commit message for your changes.
# ------------------------ >8 ------------------------
# Do not modify or remove the line above.
# Everything below it will be ignored.
diff --git a/file.txt b/file.txt
index 625fd613d9..03aeba3b21 100755
--- a/file.txt
+++ b/file.txt
@@ -38,6 +38,7 @@
 context
 line

+hello, world

 context
 line
EOF
  ${hook} input || fail "failed hook execution"
  grep '>8' input || fail "lost cut-off line"
  sed -n -e '1,/>8/ p' input >top
  grep '^Change-Id' top || fail "missing Change-Id above cut-off line"
}

# a Change-Id already set is preserved.
function test_preserve_changeid {
  cat << EOF > input
bla bla

Change-Id: I123
EOF

  ${hook} input || fail "failed hook execution"

  found=$(grep -c '^Change-Id' input)
  if [[ "${found}" != "1" ]]; then
    fail "got ${found} Change-Ids, want 1"
  fi
  found=$(grep -c '^Change-Id: I123' input)
  if [[ "${found}" != "1" ]]; then
    fail "got ${found} Change-Id: I123, want 1"
  fi
}

# Change-Id should not be inserted if gerrit.createChangeId=false
function test_suppress_changeid {
  cat << EOF > input
bla bla
EOF

  git config gerrit.createChangeId false
  ${hook} input || fail "failed hook execution"
  git config --unset gerrit.createChangeId
  found=$(grep -c '^Change-Id' input || true)
  if [[ "${found}" != "0" ]]; then
    fail "got ${found} Change-Ids, want 0"
  fi
}

# Change-Id goes after existing trailers.
function test_at_start {
  cat << EOF > input
bla bla

Bug: #123
EOF

  ${hook} input || fail "failed hook execution"
  result=$(git interpret-trailers --parse input | head -1 | grep ^Change-Id)
  if [[ -z "${result}" ]] ; then
    echo "after: "
    cat input

    fail "did not find Change-Id at start"
  fi
}

function test_dash_at_start {
  if [[ ! -x /bin/dash ]] ; then
    echo "/bin/dash not installed; skipping dash test."
    return
  fi

  cat << EOF > input
bla bla

Bug: #123
EOF

  /bin/dash ${hook} input || fail "failed hook execution"

  result=$(git interpret-trailers --parse input | head -1 | grep ^Change-Id)
  if [[ -z "${result}" ]] ; then
    echo "after: "
    cat input

    fail "did not find Change-Id at start"
  fi
}

function test_preserve_dash_changeid {
  if [[ ! -x /bin/dash ]] ; then
    echo "/bin/dash not installed; skipping dash test."
    return
  fi

  cat << EOF > input
bla bla

Change-Id: I123
EOF

  /bin/dash ${hook} input || fail "failed hook execution"

  found=$(grep -c '^Change-Id' input)
  if [[ "${found}" != "1" ]]; then
    fail "got ${found} Change-Ids, want 1"
  fi
  found=$(grep -c '^Change-Id: I123' input)
  if [[ "${found}" != "1" ]]; then
    fail "got ${found} Change-Id: I123, want 1"
  fi
}


# Test driver.
git init
for func in $( declare -F | awk '{print $3;}' | sort); do
  case ${func} in
    test_*)
      echo "=== testing $func"
      ${func}
      echo "--- done    $func"
      ;;
  esac
done