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

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

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

# Helper: make a bare git repo with no hooks yet
make_repo() {
  local dir
  dir="$(mktemp -d)"
  git -C "$dir" init -q
  echo "$dir"
}

# Fake binaries for tools we don't want to install-check during tests
FAKE_BIN="$(mktemp -d)"
trap 'rm -rf "$FAKE_BIN"' EXIT
for tool in shellcheck jq yq; do
  printf '#!/bin/sh\necho "fake %s"\n' "$tool" > "$FAKE_BIN/$tool"
  chmod +x "$FAKE_BIN/$tool"
done
export PATH="$FAKE_BIN:$PATH"

# --- 1. Rejects non-git directory ---
echo ""
echo "--- rejects non-git directory ---"
NON_GIT="$(mktemp -d)"
trap 'rm -rf "$NON_GIT"' EXIT
if bash "$SCRIPT" "$NON_GIT" > /dev/null 2>&1; then
  fail "exited 0 for non-git directory — expected exit 1"
else
  pass "exits non-zero for non-git directory"
fi

# --- 2. Creates commit-msg hook ---
echo ""
echo "--- creates commit-msg hook ---"
REPO="$(make_repo)"
trap 'rm -rf "$REPO"' EXIT
bash "$SCRIPT" "$REPO" > /dev/null 2>&1
HOOK="$REPO/.git/hooks/commit-msg"
if [[ -f "$HOOK" ]]; then
  pass "commit-msg hook file created"
else
  fail "commit-msg hook not created"
fi
if [[ -x "$HOOK" ]]; then
  pass "commit-msg hook is executable"
else
  fail "commit-msg hook is not executable"
fi
if grep -q "# managed by setup-hooks.sh" "$HOOK"; then
  pass "commit-msg hook contains idempotency marker"
else
  fail "commit-msg hook missing idempotency marker"
fi

# --- 3. commit-msg hook validates conventional commits ---
echo ""
echo "--- commit-msg hook: valid message passes ---"
REPO2="$(make_repo)"
trap 'rm -rf "$REPO2"' EXIT
bash "$SCRIPT" "$REPO2" > /dev/null 2>&1
HOOK2="$REPO2/.git/hooks/commit-msg"
TMPFILE="$(mktemp)"
trap 'rm -f "$TMPFILE"' EXIT

for valid_msg in "feat: add validation" "fix(core): correct path resolution" "chore!: drop python dep" "docs: update readme" "refactor(hooks): extract marker logic"; do
  echo "$valid_msg" > "$TMPFILE"
  if bash "$HOOK2" "$TMPFILE" > /dev/null 2>&1; then
    pass "commit-msg hook accepts: $valid_msg"
  else
    fail "commit-msg hook wrongly rejected: $valid_msg"
  fi
done

echo ""
echo "--- commit-msg hook: invalid message is rejected ---"
for invalid_msg in "added some stuff" "WIP" "Fix the thing" "FEAT: bad case" "feat bad colon"; do
  echo "$invalid_msg" > "$TMPFILE"
  if bash "$HOOK2" "$TMPFILE" > /dev/null 2>&1; then
    fail "commit-msg hook wrongly accepted: $invalid_msg"
  else
    pass "commit-msg hook rejects: $invalid_msg"
  fi
done

# --- 4. Appends pre-commit validation block ---
echo ""
echo "--- appends validation block to pre-commit hook ---"
REPO3="$(make_repo)"
trap 'rm -rf "$REPO3"' EXIT
bash "$SCRIPT" "$REPO3" > /dev/null 2>&1
PRE_COMMIT="$REPO3/.git/hooks/pre-commit"
if [[ -f "$PRE_COMMIT" ]]; then
  pass "pre-commit hook created"
else
  fail "pre-commit hook not created"
fi
if grep -q "shellcheck" "$PRE_COMMIT"; then
  pass "pre-commit hook contains shellcheck"
else
  fail "pre-commit hook missing shellcheck"
fi
if grep -q "jq" "$PRE_COMMIT"; then
  pass "pre-commit hook contains jq"
else
  fail "pre-commit hook missing jq"
fi
if grep -q "SKILL.md" "$PRE_COMMIT"; then
  pass "pre-commit hook contains SKILL.md frontmatter check"
else
  fail "pre-commit hook missing SKILL.md frontmatter check"
fi

# --- 5. Creates pre-push hook ---
echo ""
echo "--- creates pre-push hook ---"
REPO4="$(make_repo)"
trap 'rm -rf "$REPO4"' EXIT
bash "$SCRIPT" "$REPO4" > /dev/null 2>&1
PUSH_HOOK="$REPO4/.git/hooks/pre-push"
if [[ -f "$PUSH_HOOK" ]]; then
  pass "pre-push hook created"
else
  fail "pre-push hook not created"
fi
if [[ -x "$PUSH_HOOK" ]]; then
  pass "pre-push hook is executable"
else
  fail "pre-push hook is not executable"
fi
if grep -q "check-manifests" "$PUSH_HOOK"; then
  pass "pre-push hook calls check-manifests.sh"
else
  fail "pre-push hook missing check-manifests.sh call"
fi

# --- 6. Idempotent: second run replaces each block exactly once ---
echo ""
echo "--- idempotent: second run does not duplicate blocks ---"
REPO5="$(make_repo)"
trap 'rm -rf "$REPO5"' EXIT
bash "$SCRIPT" "$REPO5" > /dev/null 2>&1
bash "$SCRIPT" "$REPO5" > /dev/null 2>&1
bash "$SCRIPT" "$REPO5" > /dev/null 2>&1

for hook_file in "$REPO5/.git/hooks/commit-msg" "$REPO5/.git/hooks/pre-commit" "$REPO5/.git/hooks/pre-push"; do
  count=$(grep -c "# managed by setup-hooks.sh" "$hook_file" || true)
  hook_name="$(basename "$hook_file")"
  if [[ "$count" -eq 1 ]]; then
    pass "idempotent: $hook_name marker appears exactly once after 3 runs"
  else
    fail "idempotent: $hook_name marker appears $count times — block duplicated"
  fi
done

# --- 7. Hooks contain graceful degradation paths for missing tools ---
echo ""
echo "--- hooks contain graceful degradation for missing tools ---"
REPO6="$(make_repo)"
trap 'rm -rf "$REPO6"' EXIT
bash "$SCRIPT" "$REPO6" > /dev/null 2>&1
PRE_COMMIT6="$REPO6/.git/hooks/pre-commit"
for tool in shellcheck jq yq; do
  if grep -q "Warning:.*$tool\|$tool.*not installed\|$tool.*skipped" "$PRE_COMMIT6"; then
    pass "pre-commit hook has graceful degradation path for missing: $tool"
  else
    fail "pre-commit hook missing graceful degradation for: $tool"
  fi
done

echo ""
echo "--- setup always exits 0 (no hard dependency on optional tools) ---"
REPO7="$(make_repo)"
trap 'rm -rf "$REPO7"' EXIT
if bash "$SCRIPT" "$REPO7" > /dev/null 2>&1; then
  pass "setup exits 0 when all optional tools are present"
else
  fail "setup exited non-zero unexpectedly"
fi

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