// LoopForm Smoke Test 2: Counter-based for loop
// Tests for loop with explicit counter using loopform
//
// Expected behavior (when C++ backend implements loopform):
//   - Loop from 0 to 9 (10 iterations)
//   - Use payload mode for structural counter
//   - Return total iterations

using "lang/src/llvm_ir/instructions/loopform.hako" as LoopFormInst

static box Main {
  main() {
    print("=== LoopForm Smoke Test 2: for_counter ===")

    // Simulate for loop: for (i = 0; i < 10; i++)
    local blocks = new MapBox()
    blocks.set("preheader", 10)
    blocks.set("header", 11)
    blocks.set("body", 12)
    blocks.set("dispatch", 13)
    blocks.set("latch", 14)
    blocks.set("exit", 15)

    // Use payload mode with max iterations
    local options = new MapBox()
    options.set("mode", "payload")
    options.set("payload_max", 10)
    options.set("enable_safepoint", 1)

    // Generate loopform JSON
    local json = LoopFormInst.lower_loopform(2, blocks, 20, options)

    // Verify JSON structure
    local has_loopform = json.indexOf("\"op\":\"loopform\"")
    if has_loopform < 0 {
      print("ERROR: loopform op not found")
      return 1
    }

    local has_payload_mode = json.indexOf("\"mode\":\"payload\"")
    if has_payload_mode < 0 {
      print("ERROR: payload mode not found")
      return 1
    }

    local has_max = json.indexOf("\"payload_max\":10")
    if has_max < 0 {
      print("ERROR: payload_max not found")
      return 1
    }

    print("✓ PASS: for_counter loopform generated")
    print("Note: Actual loop execution requires C++ backend implementation")

    return 0
  }
}