# ============================================================================
# 硬链接基础工具测试（src/lib/link.sh）
# ============================================================================

setup() {
  TEST_DIR="$(mktemp -d)"
  DRY_RUN=false
}

teardown() {
  rm -rf "$TEST_DIR"
}

# get_file_inode：GNU stat 与兜底路径均可用
test_get_file_inode_works() {
  local f="$TEST_DIR/a.txt"
  echo hi >"$f"
  local inode
  inode="$(get_file_inode "$f")"
  assert_not_empty "$inode"
  assert_eq "$(stat -c '%i' "$f")" "$inode" "inode 应与 stat 一致"
}

# same_inode：硬链接同 inode，普通文件不同
test_same_inode_detection() {
  local f1="$TEST_DIR/a.txt" f2="$TEST_DIR/b.txt"
  echo hi >"$f1"
  ln "$f1" "$f2"
  assert_success same_inode "$f1" "$f2"
  echo other >"$TEST_DIR/c.txt"
  assert_failure same_inode "$f1" "$TEST_DIR/c.txt"
  assert_failure same_inode "$f1" "$TEST_DIR/不存在.txt"
}

# hardlink_or_dryrun：真实创建硬链接
test_hardlink_or_dryrun_creates_link() {
  local f1="$TEST_DIR/a.txt" f2="$TEST_DIR/link.txt"
  echo data >"$f1"
  assert_success hardlink_or_dryrun "$f1" "$f2"
  assert_file_exists "$f2"
  assert_success same_inode "$f1" "$f2"
}

# hardlink_or_dryrun：干运行不创建
test_hardlink_or_dryrun_dry_run() {
  local f1="$TEST_DIR/a.txt" f2="$TEST_DIR/link.txt"
  echo data >"$f1"
  DRY_RUN=true
  assert_success hardlink_or_dryrun "$f1" "$f2"
  assert_file_absent "$f2"
}

# hardlink_or_dryrun：目标已存在时替换
test_hardlink_or_dryrun_replaces_existing() {
  local f1="$TEST_DIR/a.txt" f2="$TEST_DIR/exists.txt"
  echo new >"$f1"
  echo old >"$f2"
  assert_success hardlink_or_dryrun "$f1" "$f2"
  assert_success same_inode "$f1" "$f2"
  assert_eq "new" "$(cat "$f2")"
}