#!/usr/bin/env bash
# Tests for the git hook install block in scripts/install.sh.
# Runs install.sh from a temp repo to avoid touching the real .git/hooks/.
set -euo pipefail

# This script may itself run inside a git hook (e.g. pre-push), which sets
# GIT_DIR/GIT_EXEC_PATH/etc. in the environment. `git init`/`git -C` below
# would silently re-target the inherited GIT_DIR instead of creating an
# isolated repo in $TEMP_REPO, so start from a clean slate.
for var in $(compgen -v | grep '^GIT_'); do unset "$var"; done

REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
PASS=0
FAIL=0

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

# ---------------------------------------------------------------------------
# Temp repo setup
#
# install.sh derives REPO_ROOT from the script's own location, so copying it
# into a temp tree makes REPO_ROOT point there, not at the real checkout.
# ---------------------------------------------------------------------------

TEMP_REPO="$(mktemp -d)"
TEMP_HOME="$(mktemp -d)"
trap 'rm -rf "$TEMP_REPO" "$TEMP_HOME"' EXIT

mkdir -p "$TEMP_REPO/scripts"
git -C "$TEMP_REPO" init -q

# Minimal deploy-manifest.sh — empty deploy lists so install.sh reaches the
# hook-copy block without attempting to copy files that don't exist in the
# temp tree.
cat > "$TEMP_REPO/scripts/deploy-manifest.sh" << 'EOF'
# shellcheck disable=SC2034
DEPLOY_FILES=()
DEPLOY_EXECUTABLES=()
DEPLOY_DIRS=()
EOF

# Copy the real install.sh into the temp repo.
cp "$REPO_ROOT/scripts/install.sh" "$TEMP_REPO/scripts/install.sh"

HOOKS_SRC="$TEMP_REPO/scripts/git-hooks"
mkdir -p "$HOOKS_SRC"

# Copy whatever real hooks exist, then add a synthetic fixture. The repo
# currently ships none — the only entry was `post-push`, removed once it was
# found that git has no such client-side hook, so it had never fired (see
# ADR-0019). install.sh's copy block is generic and stays worth testing, so the
# fixture keeps that coverage alive independently of whether any real hook
# happens to exist. Real hooks are still picked up by the loops below.
if [[ -d "$REPO_ROOT/scripts/git-hooks" ]]; then
  find "$REPO_ROOT/scripts/git-hooks" -maxdepth 1 -type f -exec cp {} "$HOOKS_SRC/" \;
fi

FIXTURE_HOOK="fixture-hook"
printf '#!/usr/bin/env bash\nexit 0\n' > "$HOOKS_SRC/$FIXTURE_HOOK"
chmod +x "$HOOKS_SRC/$FIXTURE_HOOK"

run_install() {
  HOME="$TEMP_HOME" bash "$TEMP_REPO/scripts/install.sh" > /dev/null 2>&1
}

# ---------------------------------------------------------------------------
echo "--- hook install: files copied to .git/hooks/ ---"
# ---------------------------------------------------------------------------

run_install

for hook_file in "$HOOKS_SRC"/*; do
  [[ -f "$hook_file" ]] || continue
  hook_name="$(basename "$hook_file")"
  if [[ -f "$TEMP_REPO/.git/hooks/$hook_name" ]]; then
    pass "$hook_name installed to .git/hooks/"
  else
    fail "$hook_name missing from .git/hooks/"
  fi
done

# ---------------------------------------------------------------------------
echo ""
echo "--- hook install: installed hooks are executable ---"
# ---------------------------------------------------------------------------

for hook_file in "$HOOKS_SRC"/*; do
  [[ -f "$hook_file" ]] || continue
  hook_name="$(basename "$hook_file")"
  if [[ -x "$TEMP_REPO/.git/hooks/$hook_name" ]]; then
    pass "$hook_name is executable"
  else
    fail "$hook_name is not executable"
  fi
done

# ---------------------------------------------------------------------------
echo ""
echo "--- hook install: directories in git-hooks/ are not installed ---"
# ---------------------------------------------------------------------------

# Add a subdirectory to scripts/git-hooks/ — the install block must skip it
mkdir -p "$HOOKS_SRC/not-a-hook"
run_install
if [[ ! -e "$TEMP_REPO/.git/hooks/not-a-hook" ]]; then
  pass "directories in scripts/git-hooks/ are not copied to .git/hooks/"
else
  fail "a directory from scripts/git-hooks/ was incorrectly installed"
fi
rmdir "$HOOKS_SRC/not-a-hook"

# ---------------------------------------------------------------------------
echo ""
echo "--- hook install: resolves correctly when GIT_DIR is inherited (hook context) ---"
# ---------------------------------------------------------------------------

# Git sets GIT_DIR/GIT_WORK_TREE for child processes when this script itself
# runs as a hook (e.g. pre-push). Simulate that and confirm install.sh still
# resolves hooks against $TEMP_REPO, not the inherited GIT_DIR.
OTHER_REPO="$(mktemp -d)"
git -C "$OTHER_REPO" init -q
if HOME="$TEMP_HOME" GIT_DIR="$OTHER_REPO/.git" GIT_WORK_TREE="$OTHER_REPO" \
    bash "$TEMP_REPO/scripts/install.sh" > /dev/null 2>&1; then
  if [[ -f "$TEMP_REPO/.git/hooks/$FIXTURE_HOOK" ]]; then
    pass "resolves \$TEMP_REPO/.git/hooks/ even with inherited GIT_DIR"
  else
    fail "installed into inherited GIT_DIR instead of \$TEMP_REPO"
  fi
else
  fail "install.sh failed when GIT_DIR/GIT_WORK_TREE were inherited"
fi
rm -rf "$OTHER_REPO"

# ---------------------------------------------------------------------------
echo ""
echo "--- hook install: idempotent ---"
# ---------------------------------------------------------------------------

run_install

for hook_file in "$HOOKS_SRC"/*; do
  [[ -f "$hook_file" ]] || continue
  hook_name="$(basename "$hook_file")"
  if diff -q "$hook_file" "$TEMP_REPO/.git/hooks/$hook_name" > /dev/null 2>&1; then
    pass "idempotent: $hook_name content unchanged after second install"
  else
    fail "idempotent: $hook_name content corrupted after second install"
  fi
  if [[ -x "$TEMP_REPO/.git/hooks/$hook_name" ]]; then
    pass "idempotent: $hook_name still executable after second install"
  else
    fail "idempotent: $hook_name lost executable bit after second install"
  fi
done

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