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

REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
SCRIPT="$REPO_ROOT/scripts/check-release-needed.sh"
PASS=0
FAIL=0

pass() { echo "  PASS: $1"; PASS=$((PASS + 1)); }
fail() { echo "  FAIL: $1"; FAIL=$((FAIL + 1)); }

# Helper: a fixture repo with one release-relevant file, committed and tagged.
make_tagged_fixture() {
  local dir
  dir="$(mktemp -d)"
  (cd "$dir" && git init -q && git config user.email t@t.t && git config user.name t)
  mkdir -p "$dir/scripts"
  echo "v1" > "$dir/scripts/skill-size-check.sh"
  (cd "$dir" && git add -A && git commit -q -m "initial" && git tag v1.0.0)
  echo "$dir"
}

run_check() {
  local dir="$1" branch="$2"
  (cd "$dir" && PRE_COMMIT_REMOTE_BRANCH="$branch" bash "$SCRIPT" 2>&1)
}

# --- 1. Not targeting main: silent no-op regardless of state ---
echo ""
echo "--- exits 0 when not pushing to main, even with no tags ---"
FIXTURE1="$(mktemp -d)"
trap 'rm -rf "$FIXTURE1"' EXIT
(cd "$FIXTURE1" && git init -q)
if run_check "$FIXTURE1" "refs/heads/feature-branch" > /dev/null; then
  pass "exits 0 when target branch isn't main"
else
  fail "exited non-zero on a non-main target branch"
fi

# --- 2. Targeting main, no tag exists at all: hard fail ---
echo ""
echo "--- exits 1 when targeting main and no tag exists ---"
FIXTURE2="$(mktemp -d)"
trap 'rm -rf "$FIXTURE1" "$FIXTURE2"' EXIT
(cd "$FIXTURE2" && git init -q && git config user.email t@t.t && git config user.name t)
mkdir -p "$FIXTURE2/scripts"
echo "v1" > "$FIXTURE2/scripts/skill-size-check.sh"
(cd "$FIXTURE2" && git add -A && git commit -q -m "initial")
if run_check "$FIXTURE2" "refs/heads/main" > /dev/null; then
  fail "exited 0 when targeting main with no tag — expected exit 1"
else
  pass "exits non-zero when targeting main and no tag exists yet"
fi

# --- 3. Targeting main, tag exists, no release-relevant changes since: passes ---
echo ""
echo "--- exits 0 when targeting main and nothing release-relevant changed since the tag ---"
FIXTURE3="$(make_tagged_fixture)"
trap 'rm -rf "$FIXTURE1" "$FIXTURE2" "$FIXTURE3"' EXIT
echo "unrelated" > "$FIXTURE3/README.md"
(cd "$FIXTURE3" && git add -A && git commit -q -m "unrelated change")
if run_check "$FIXTURE3" "refs/heads/main" > /dev/null; then
  pass "exits 0 when only unrelated files changed since the tag"
else
  fail "exited non-zero despite no release-relevant changes since the tag"
fi

# --- 4. Targeting main, tag exists, a release-relevant file changed since: hard fail ---
echo ""
echo "--- exits 1 when a release-relevant file changed since the tag ---"
FIXTURE4="$(make_tagged_fixture)"
trap 'rm -rf "$FIXTURE1" "$FIXTURE2" "$FIXTURE3" "$FIXTURE4"' EXIT
echo "v2" > "$FIXTURE4/scripts/skill-size-check.sh"
(cd "$FIXTURE4" && git add -A && git commit -q -m "update release-relevant script")
OUT4=$(run_check "$FIXTURE4" "refs/heads/main" || true)
if echo "$OUT4" | grep -q "skill-size-check.sh"; then
  pass "exits non-zero and names the changed file when a release-relevant path changed since the tag"
else
  fail "did not flag the release-relevant file that changed since the tag"
fi

# --- 5. Not targeting main even with release-relevant changes and a tag: still a no-op ---
echo ""
echo "--- exits 0 on a feature branch even with release-relevant changes since the tag ---"
FIXTURE5="$(make_tagged_fixture)"
trap 'rm -rf "$FIXTURE1" "$FIXTURE2" "$FIXTURE3" "$FIXTURE4" "$FIXTURE5"' EXIT
echo "v2" > "$FIXTURE5/scripts/skill-size-check.sh"
(cd "$FIXTURE5" && git add -A && git commit -q -m "update release-relevant script")
if run_check "$FIXTURE5" "refs/heads/some-feature" > /dev/null; then
  pass "exits 0 on a feature branch regardless of un-tagged release-relevant changes"
else
  fail "hard-failed on a feature branch — should only ever fail when targeting main"
fi

echo ""
echo "Results: $PASS passed, $FAIL failed"
[[ $FAIL -eq 0 ]]