// std.array (Ny) - Phase15 MVP
// Usage:
//   include "apps/std/array.hako"
//   local a = new ArrayBox(); StdArrayNy.array_push(a, 1); StdArrayNy.array_len(a)
// Notes:
//   - In-place ops where natural (push/pop)
//   - slice clamps [start,end); returns new array
//   - array_pop returns popped element or null

static box StdArrayNy {
  array_len(a) {
    if a == null { return 0 }
    return a.length()
  }

  array_push(a, x) {
    if a == null { return 0 }
    a.push(x)
    return a.length()
  }

  array_pop(a) {
    if a == null { return null }
    // VM/Interpreter provides pop(); returns element or null when empty
    return a.pop()
  }

  array_slice(a, start, end) {
    if a == null { return new ArrayBox() }
    local n, b, e
    n = a.length()
    b = start
    e = end
    if b < 0 { b = 0 }
    if e < 0 { e = 0 }
    if b > n { b = n }
    if e > n { e = n }
    if e < b { e = b }
    // Prefer native slice if available
    return a.slice(b, e)
  }
}