package workflow_test

import (
	"context"
	"testing"

	"workflow"
)

// makeV313LLMFileWorkflow returns a v3.13 workflow where an LLM step writes files via out mapping.
func makeV313LLMFileWorkflow(filePaths []string) *workflow.Workflow {
	out := workflow.StepOutput{}
	for _, p := range filePaths {
		out[p] = "=_result"
	}
	return &workflow.Workflow{
		Version: "3.13",
		Name:    "V313 File Event Test",
		Registry: workflow.Registry{
			Services:   []string{},
			Components: []string{},
			Vars:       []string{},
			Files: workflow.FilesRegistry{
				Artifacts: []string{"/src/*"},
			},
		},
		Steps: []workflow.Step{
			{
				ID: "LLM_GenCode",
				In: workflow.StepInput{
					"messages": []interface{}{
						map[string]interface{}{"role": "user", "content": "generate"},
					},
				},
				Out:  out,
				Next: "Stop_End",
			},
			{ID: "Stop_End"},
		},
	}
}

// makeV313WriteStepWorkflow returns a v3.13 workflow with a Write_* step.
func makeV313WriteStepWorkflow() *workflow.Workflow {
	return &workflow.Workflow{
		Version: "3.13",
		Name:    "V313 Write Step Test",
		Registry: workflow.Registry{
			Services:   []string{},
			Components: []string{},
			Vars:       []string{},
			Files: workflow.FilesRegistry{
				Artifacts: []string{"/src/*"},
			},
		},
		Steps: []workflow.Step{
			{
				ID:     "Write_Output",
				Target: "/src/output.txt",
				Value:  "hello world",
				Next:   "Stop_End",
			},
			{ID: "Stop_End"},
		},
	}
}

// ---------------------------------------------------------------------------
// file_start ordering tests (spec 3.13 §13.3)
// ---------------------------------------------------------------------------

// TestFileStartEmittedAfterStepStart verifies that file_start events are emitted
// after step_start and before any llm_token, for an LLM step with file out targets.
func TestFileStartEmittedAfterStepStart(t *testing.T) {
	wf := makeV313LLMFileWorkflow([]string{"/src/Header.tsx"})

	adapters := createTestAdapters()
	llm := adapters.LLM.(*workflow.DefaultLLMAdapter)
	llm.SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		return map[string]interface{}{
			"content":       "export default function Header() {}",
			"model":         "gpt-4",
			"finish_reason": "stop",
		}, nil
	})

	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}

	result, err := engine.Execute(context.Background(), map[string]interface{}{}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	var runEvents []workflow.RunEvent
	for ev := range result.RunEventStream {
		runEvents = append(runEvents, ev)
	}

	// Find indices for LLM_GenCode
	idxStepStart, idxFileStart, idxStepDone := -1, -1, -1
	for i, ev := range runEvents {
		if ev.StepID != nil && *ev.StepID == "LLM_GenCode" {
			switch ev.Type {
			case workflow.RunEventStepStart:
				idxStepStart = i
			case workflow.RunEventFileStart:
				if idxFileStart == -1 {
					idxFileStart = i
				}
			case workflow.RunEventStepDone:
				idxStepDone = i
			}
		}
	}

	if idxStepStart == -1 {
		t.Fatal("missing step_start for LLM_GenCode")
	}
	if idxFileStart == -1 {
		t.Fatal("missing file_start for LLM_GenCode")
	}
	if idxStepDone == -1 {
		t.Fatal("missing step_done for LLM_GenCode")
	}

	// Order: step_start < file_start < step_done
	if !(idxStepStart < idxFileStart && idxFileStart < idxStepDone) {
		t.Errorf("event order wrong: step_start=%d, file_start=%d, step_done=%d (want start < file_start < done)",
			idxStepStart, idxFileStart, idxStepDone)
	}
}

// TestFileStartBeforeLLMToken verifies that file_start events precede any llm_token events.
func TestFileStartBeforeLLMToken(t *testing.T) {
	wf := makeV313LLMFileWorkflow([]string{"/src/Header.tsx"})
	// Enable streaming
	wf.Steps[0].In["stream"] = true

	adapters := createTestAdapters()
	llm := adapters.LLM.(*workflow.DefaultLLMAdapter)
	llm.SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		stream <- "chunk1"
		stream <- "chunk2"
		return map[string]interface{}{
			"content":       "chunk1chunk2",
			"model":         "gpt-4",
			"finish_reason": "stop",
		}, nil
	})

	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}

	result, err := engine.Execute(context.Background(), map[string]interface{}{}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	var runEvents []workflow.RunEvent
	for ev := range result.RunEventStream {
		runEvents = append(runEvents, ev)
	}

	// Find first llm_token and last file_start for LLM_GenCode
	firstTokenIdx, lastFileStartIdx := -1, -1
	for i, ev := range runEvents {
		if ev.StepID == nil || *ev.StepID != "LLM_GenCode" {
			continue
		}
		if ev.Type == workflow.RunEventLLMToken && firstTokenIdx == -1 {
			firstTokenIdx = i
		}
		if ev.Type == workflow.RunEventFileStart {
			lastFileStartIdx = i
		}
	}

	if lastFileStartIdx == -1 {
		t.Fatal("missing file_start for LLM_GenCode")
	}
	if firstTokenIdx == -1 {
		t.Fatal("missing llm_token for LLM_GenCode (streaming)")
	}

	// file_start must come before any llm_token
	if lastFileStartIdx >= firstTokenIdx {
		t.Errorf("file_start (idx=%d) must precede first llm_token (idx=%d)", lastFileStartIdx, firstTokenIdx)
	}
}

// TestFileStartPayloadPathOnly verifies that file_start payload contains only 'path'.
func TestFileStartPayloadPathOnly(t *testing.T) {
	wf := makeV313LLMFileWorkflow([]string{"/src/Header.tsx"})

	adapters := createTestAdapters()
	llm := adapters.LLM.(*workflow.DefaultLLMAdapter)
	llm.SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		return map[string]interface{}{
			"content":       "code",
			"model":         "gpt-4",
			"finish_reason": "stop",
		}, nil
	})

	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}

	result, err := engine.Execute(context.Background(), map[string]interface{}{}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	var runEvents []workflow.RunEvent
	for ev := range result.RunEventStream {
		runEvents = append(runEvents, ev)
	}

	for _, ev := range runEvents {
		if ev.Type != workflow.RunEventFileStart {
			continue
		}
		path, ok := ev.Payload["path"].(string)
		if !ok || path == "" {
			t.Errorf("file_start payload missing or empty 'path': %v", ev.Payload)
		}
		// path should not have a leading slash
		if len(path) > 0 && path[0] == '/' {
			t.Errorf("file_start path should not have leading slash: %q", path)
		}
		// Should only have 'path' field (spec says payload carries only path)
		if len(ev.Payload) != 1 {
			t.Errorf("file_start payload should contain only 'path', got: %v", ev.Payload)
		}
	}
}

// ---------------------------------------------------------------------------
// file_done ordering and payload tests (spec 3.13 §13.3)
// ---------------------------------------------------------------------------

// TestFileDoneAfterLLMDoneBeforeStepDone verifies file_done ordering for LLM steps.
func TestFileDoneAfterLLMDoneBeforeStepDone(t *testing.T) {
	wf := makeV313LLMFileWorkflow([]string{"/src/Header.tsx"})

	adapters := createTestAdapters()
	llm := adapters.LLM.(*workflow.DefaultLLMAdapter)
	llm.SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		return map[string]interface{}{
			"content":       "export default function Header() {}",
			"model":         "gpt-4",
			"finish_reason": "stop",
		}, nil
	})

	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}

	result, err := engine.Execute(context.Background(), map[string]interface{}{}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	var runEvents []workflow.RunEvent
	for ev := range result.RunEventStream {
		runEvents = append(runEvents, ev)
	}

	idxLLMDone, idxFileDone, idxStepDone := -1, -1, -1
	for i, ev := range runEvents {
		if ev.StepID == nil || *ev.StepID != "LLM_GenCode" {
			continue
		}
		switch ev.Type {
		case workflow.RunEventLLMDone:
			idxLLMDone = i
		case workflow.RunEventFileDone:
			if idxFileDone == -1 {
				idxFileDone = i
			}
		case workflow.RunEventStepDone:
			idxStepDone = i
		}
	}

	if idxLLMDone == -1 {
		t.Fatal("missing llm_done for LLM_GenCode")
	}
	if idxFileDone == -1 {
		t.Fatal("missing file_done for LLM_GenCode")
	}
	if idxStepDone == -1 {
		t.Fatal("missing step_done for LLM_GenCode")
	}

	// Order: llm_done < file_done < step_done
	if !(idxLLMDone < idxFileDone && idxFileDone < idxStepDone) {
		t.Errorf("event order wrong: llm_done=%d, file_done=%d, step_done=%d (want llm_done < file_done < step_done)",
			idxLLMDone, idxFileDone, idxStepDone)
	}
}

// TestFileDonePayload verifies that file_done payload contains 'path' and 'size_bytes'.
func TestFileDonePayload(t *testing.T) {
	const fileContent = "export default function Header() { return null; }"
	wf := makeV313LLMFileWorkflow([]string{"/src/Header.tsx"})

	adapters := createTestAdapters()
	llm := adapters.LLM.(*workflow.DefaultLLMAdapter)
	llm.SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		return map[string]interface{}{
			"content":       fileContent,
			"model":         "gpt-4",
			"finish_reason": "stop",
		}, nil
	})

	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}

	result, err := engine.Execute(context.Background(), map[string]interface{}{}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	var runEvents []workflow.RunEvent
	for ev := range result.RunEventStream {
		runEvents = append(runEvents, ev)
	}

	found := false
	for _, ev := range runEvents {
		if ev.Type != workflow.RunEventFileDone {
			continue
		}
		found = true
		path, ok := ev.Payload["path"].(string)
		if !ok || path == "" {
			t.Errorf("file_done payload missing 'path': %v", ev.Payload)
		}
		if len(path) > 0 && path[0] == '/' {
			t.Errorf("file_done path should not have leading slash: %q", path)
		}
		sizeBytes, ok := ev.Payload["size_bytes"]
		if !ok {
			t.Errorf("file_done payload missing 'size_bytes': %v", ev.Payload)
		} else {
			size, ok := sizeBytes.(int)
			if !ok {
				t.Errorf("file_done size_bytes should be int, got %T: %v", sizeBytes, sizeBytes)
			} else if size != len([]byte(fileContent)) {
				t.Errorf("file_done size_bytes: got %d, want %d", size, len([]byte(fileContent)))
			}
		}
	}
	if !found {
		t.Error("expected at least one file_done RunEvent, none found")
	}
}

// TestMultipleFilesFileStartAndDone verifies that multiple files all get
// file_start and file_done events.
func TestMultipleFilesFileStartAndDone(t *testing.T) {
	wf := makeV313LLMFileWorkflow([]string{"/src/Header.tsx", "/src/Header.module.css"})

	adapters := createTestAdapters()
	llm := adapters.LLM.(*workflow.DefaultLLMAdapter)
	llm.SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		return map[string]interface{}{
			"content":       "/* styles */",
			"model":         "gpt-4",
			"finish_reason": "stop",
		}, nil
	})

	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}

	result, err := engine.Execute(context.Background(), map[string]interface{}{}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	var runEvents []workflow.RunEvent
	for ev := range result.RunEventStream {
		runEvents = append(runEvents, ev)
	}

	fileStartCount, fileDoneCount := 0, 0
	for _, ev := range runEvents {
		if ev.StepID == nil || *ev.StepID != "LLM_GenCode" {
			continue
		}
		if ev.Type == workflow.RunEventFileStart {
			fileStartCount++
		}
		if ev.Type == workflow.RunEventFileDone {
			fileDoneCount++
		}
	}

	if fileStartCount != 2 {
		t.Errorf("expected 2 file_start events for 2 files, got %d", fileStartCount)
	}
	if fileDoneCount != 2 {
		t.Errorf("expected 2 file_done events for 2 files, got %d", fileDoneCount)
	}

	// All file_start events must precede all file_done events
	lastFileStartIdx, firstFileDoneIdx := -1, -1
	for i, ev := range runEvents {
		if ev.StepID == nil || *ev.StepID != "LLM_GenCode" {
			continue
		}
		if ev.Type == workflow.RunEventFileStart {
			lastFileStartIdx = i
		}
		if ev.Type == workflow.RunEventFileDone && firstFileDoneIdx == -1 {
			firstFileDoneIdx = i
		}
	}

	if lastFileStartIdx == -1 || firstFileDoneIdx == -1 {
		t.Fatal("missing file_start or file_done events")
	}
	if lastFileStartIdx >= firstFileDoneIdx {
		t.Errorf("all file_start (last=%d) must precede first file_done (idx=%d)",
			lastFileStartIdx, firstFileDoneIdx)
	}
}

// ---------------------------------------------------------------------------
// Write_* step file events (spec 3.13 §13.3)
// ---------------------------------------------------------------------------

// TestWriteStepFileEvents verifies that Write_* steps emit file_start and file_done.
func TestWriteStepFileEvents(t *testing.T) {
	wf := makeV313WriteStepWorkflow()

	adapters := createTestAdapters()

	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}

	result, err := engine.Execute(context.Background(), map[string]interface{}{}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	var runEvents []workflow.RunEvent
	for ev := range result.RunEventStream {
		runEvents = append(runEvents, ev)
	}

	// Find file_start and file_done for Write_Output
	var fileStartEvs, fileDoneEvs []workflow.RunEvent
	idxStepStart, idxStepDone := -1, -1
	for i, ev := range runEvents {
		if ev.StepID == nil || *ev.StepID != "Write_Output" {
			continue
		}
		switch ev.Type {
		case workflow.RunEventStepStart:
			idxStepStart = i
		case workflow.RunEventFileStart:
			fileStartEvs = append(fileStartEvs, ev)
		case workflow.RunEventFileDone:
			fileDoneEvs = append(fileDoneEvs, ev)
		case workflow.RunEventStepDone:
			idxStepDone = i
		}
	}

	if len(fileStartEvs) == 0 {
		t.Fatal("expected file_start for Write_Output, none found")
	}
	if len(fileDoneEvs) == 0 {
		t.Fatal("expected file_done for Write_Output, none found")
	}

	// file_start must come after step_start
	for _, ev := range fileStartEvs {
		if idxStepStart == -1 || ev.Seq <= runEvents[idxStepStart].Seq {
			t.Errorf("file_start seq=%d must be after step_start seq=%d", ev.Seq, runEvents[idxStepStart].Seq)
		}
	}

	// file_done must come before step_done
	for _, ev := range fileDoneEvs {
		if idxStepDone == -1 || ev.Seq >= runEvents[idxStepDone].Seq {
			t.Errorf("file_done seq=%d must be before step_done seq=%d", ev.Seq, runEvents[idxStepDone].Seq)
		}
	}

	// Verify file_done has path and size_bytes
	for _, ev := range fileDoneEvs {
		if _, ok := ev.Payload["path"]; !ok {
			t.Errorf("file_done payload missing 'path': %v", ev.Payload)
		}
		if _, ok := ev.Payload["size_bytes"]; !ok {
			t.Errorf("file_done payload missing 'size_bytes': %v", ev.Payload)
		}
	}
}

// TestNoFileEventsWhenNoFilesWritten verifies that no file_start/file_done events
// are emitted for steps that don't write files.
func TestNoFileEventsWhenNoFilesWritten(t *testing.T) {
	wf := &workflow.Workflow{
		Version: "3.13",
		Name:    "No File Events Test",
		Registry: workflow.Registry{
			Services:   []string{},
			Components: []string{},
			Vars:       []string{"$answer(STRING)"},
			Files:      workflow.FilesRegistry{},
		},
		Steps: []workflow.Step{
			{
				ID: "LLM_Answer",
				In: workflow.StepInput{
					"messages": []interface{}{
						map[string]interface{}{"role": "user", "content": "hi"},
					},
				},
				Out:  workflow.StepOutput{"$answer": "=_result"},
				Next: "Stop_End",
			},
			{ID: "Stop_End"},
		},
	}

	adapters := createTestAdapters()
	llm := adapters.LLM.(*workflow.DefaultLLMAdapter)
	llm.SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		return map[string]interface{}{"content": "answer", "model": "gpt-4", "finish_reason": "stop"}, nil
	})

	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}

	result, err := engine.Execute(context.Background(), map[string]interface{}{}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	for ev := range result.RunEventStream {
		if ev.Type == workflow.RunEventFileStart || ev.Type == workflow.RunEventFileDone {
			t.Errorf("unexpected %q RunEvent for step with no file outputs", ev.Type)
		}
	}
}

// ---------------------------------------------------------------------------
// print / step_print tests (spec 3.13 §5.2.12)
// ---------------------------------------------------------------------------

// TestStepPrintLiteralMessage verifies that a literal print value emits step_print
// with the correct message between file_done and step_done.
func TestStepPrintLiteralMessage(t *testing.T) {
	wf := &workflow.Workflow{
		Version: "3.13",
		Name:    "Print Literal Test",
		Registry: workflow.Registry{
			Vars:  []string{"$answer(STRING)"},
			Files: workflow.FilesRegistry{},
		},
		Steps: []workflow.Step{
			{
				ID: "LLM_Answer",
				In: workflow.StepInput{
					"messages": []interface{}{
						map[string]interface{}{"role": "user", "content": "hi"},
					},
				},
				Out:   workflow.StepOutput{"$answer": "=_result"},
				Print: "step done",
				Next:  "Stop_End",
			},
			{ID: "Stop_End"},
		},
	}

	adapters := createTestAdapters()
	adapters.LLM.(*workflow.DefaultLLMAdapter).SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		return map[string]interface{}{"content": "hello", "model": "gpt-4", "finish_reason": "stop"}, nil
	})

	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}
	result, err := engine.Execute(context.Background(), map[string]interface{}{}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	var runEvents []workflow.RunEvent
	for ev := range result.RunEventStream {
		runEvents = append(runEvents, ev)
	}

	// Find step_print event for LLM_Answer
	var printEv *workflow.RunEvent
	for i := range runEvents {
		if runEvents[i].Type == workflow.RunEventStepPrint && runEvents[i].StepID != nil && *runEvents[i].StepID == "LLM_Answer" {
			printEv = &runEvents[i]
			break
		}
	}

	if printEv == nil {
		t.Fatal("expected step_print RunEvent for LLM_Answer, none found")
	}
	if printEv.Payload["message"] != "step done" {
		t.Errorf("step_print message: got %v, want 'step done'", printEv.Payload["message"])
	}
}

// TestStepPrintExpressionWithVariable verifies that print evaluates expressions
// and can reference global variables set via out mapping.
func TestStepPrintExpressionWithVariable(t *testing.T) {
	wf := &workflow.Workflow{
		Version: "3.13",
		Name:    "Print Expression Test",
		Registry: workflow.Registry{
			Vars:  []string{"$answer(STRING)"},
			Files: workflow.FilesRegistry{},
		},
		Steps: []workflow.Step{
			{
				ID: "LLM_Answer",
				In: workflow.StepInput{
					"messages": []interface{}{
						map[string]interface{}{"role": "user", "content": "hi"},
					},
				},
				Out:   workflow.StepOutput{"$answer": "=_result"},
				Print: "=\"Got: \" + $answer",
				Next:  "Stop_End",
			},
			{ID: "Stop_End"},
		},
	}

	adapters := createTestAdapters()
	adapters.LLM.(*workflow.DefaultLLMAdapter).SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		return map[string]interface{}{"content": "world", "model": "gpt-4", "finish_reason": "stop"}, nil
	})

	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}
	result, err := engine.Execute(context.Background(), map[string]interface{}{}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	var runEvents []workflow.RunEvent
	for ev := range result.RunEventStream {
		runEvents = append(runEvents, ev)
	}

	var printEv *workflow.RunEvent
	for i := range runEvents {
		if runEvents[i].Type == workflow.RunEventStepPrint && runEvents[i].StepID != nil && *runEvents[i].StepID == "LLM_Answer" {
			printEv = &runEvents[i]
			break
		}
	}

	if printEv == nil {
		t.Fatal("expected step_print RunEvent, none found")
	}
	if printEv.Payload["message"] != "Got: world" {
		t.Errorf("step_print message: got %v, want 'Got: world'", printEv.Payload["message"])
	}
}

// TestStepPrintOrderingBeforeStepDone verifies order: step_print precedes step_done.
func TestStepPrintOrderingBeforeStepDone(t *testing.T) {
	wf := &workflow.Workflow{
		Version: "3.13",
		Name:    "Print Order Test",
		Registry: workflow.Registry{
			Vars:  []string{"$answer(STRING)"},
			Files: workflow.FilesRegistry{},
		},
		Steps: []workflow.Step{
			{
				ID: "LLM_Answer",
				In: workflow.StepInput{
					"messages": []interface{}{
						map[string]interface{}{"role": "user", "content": "hi"},
					},
				},
				Out:   workflow.StepOutput{"$answer": "=_result"},
				Print: "done",
				Next:  "Stop_End",
			},
			{ID: "Stop_End"},
		},
	}

	adapters := createTestAdapters()
	adapters.LLM.(*workflow.DefaultLLMAdapter).SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		return map[string]interface{}{"content": "ok", "model": "gpt-4", "finish_reason": "stop"}, nil
	})

	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}
	result, err := engine.Execute(context.Background(), map[string]interface{}{}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	var runEvents []workflow.RunEvent
	for ev := range result.RunEventStream {
		runEvents = append(runEvents, ev)
	}

	idxPrint, idxDone := -1, -1
	for i, ev := range runEvents {
		if ev.StepID == nil || *ev.StepID != "LLM_Answer" {
			continue
		}
		if ev.Type == workflow.RunEventStepPrint {
			idxPrint = i
		}
		if ev.Type == workflow.RunEventStepDone {
			idxDone = i
		}
	}

	if idxPrint == -1 {
		t.Fatal("missing step_print for LLM_Answer")
	}
	if idxDone == -1 {
		t.Fatal("missing step_done for LLM_Answer")
	}
	if idxPrint >= idxDone {
		t.Errorf("step_print (idx=%d) must precede step_done (idx=%d)", idxPrint, idxDone)
	}
}

// TestStepPrintNotEmittedWhenSkipped verifies step_print is not emitted when if=false.
func TestStepPrintNotEmittedWhenSkipped(t *testing.T) {
	wf := &workflow.Workflow{
		Version: "3.13",
		Name:    "Print Skip Test",
		Registry: workflow.Registry{
			Vars:  []string{"$flag(BOOLEAN)"},
			Files: workflow.FilesRegistry{},
		},
		Steps: []workflow.Step{
			{
				ID:    "LLM_Skipped",
				If:    "=$flag",
				In:    workflow.StepInput{"messages": []interface{}{map[string]interface{}{"role": "user", "content": "hi"}}},
				Print: "should not appear",
				Next:  "Stop_End",
			},
			{ID: "Stop_End"},
		},
	}

	adapters := createTestAdapters()
	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}
	result, err := engine.Execute(context.Background(), map[string]interface{}{"$flag": false}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	for ev := range result.RunEventStream {
		if ev.Type == workflow.RunEventStepPrint {
			t.Errorf("unexpected step_print for skipped step: %v", ev.Payload)
		}
	}
}

// TestStepPrintNotEmittedWhenFailed verifies step_print is not emitted when the step errors.
func TestStepPrintNotEmittedWhenFailed(t *testing.T) {
	wf := &workflow.Workflow{
		Version: "3.13",
		Name:    "Print Fail Test",
		Registry: workflow.Registry{
			Vars:  []string{"$answer(STRING)"},
			Files: workflow.FilesRegistry{},
		},
		Steps: []workflow.Step{
			{
				ID:    "LLM_Fail",
				In:    workflow.StepInput{"messages": []interface{}{map[string]interface{}{"role": "user", "content": "hi"}}},
				Out:   workflow.StepOutput{"$answer": "=_result"},
				Print: "should not appear",
				Next:  "Stop_End",
			},
			{ID: "Stop_End"},
		},
	}

	adapters := createTestAdapters()
	adapters.LLM.(*workflow.DefaultLLMAdapter).SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		return nil, &workflow.LLMError{Type: "rate_limit", Message: "limit", Retryable: true}
	})

	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}
	result, err := engine.Execute(context.Background(), map[string]interface{}{}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	for ev := range result.RunEventStream {
		if ev.Type == workflow.RunEventStepPrint {
			t.Errorf("unexpected step_print for failed step: %v", ev.Payload)
		}
	}
}

// TestStepPrintAfterFileDone verifies order when step has both file outputs and print.
func TestStepPrintAfterFileDone(t *testing.T) {
	wf := makeV313LLMFileWorkflow([]string{"/src/Header.tsx"})
	wf.Steps[0].Print = "files written"

	adapters := createTestAdapters()
	adapters.LLM.(*workflow.DefaultLLMAdapter).SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		return map[string]interface{}{"content": "code", "model": "gpt-4", "finish_reason": "stop"}, nil
	})

	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}
	result, err := engine.Execute(context.Background(), map[string]interface{}{}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	var runEvents []workflow.RunEvent
	for ev := range result.RunEventStream {
		runEvents = append(runEvents, ev)
	}

	idxFileDone, idxPrint, idxStepDone := -1, -1, -1
	for i, ev := range runEvents {
		if ev.StepID == nil || *ev.StepID != "LLM_GenCode" {
			continue
		}
		switch ev.Type {
		case workflow.RunEventFileDone:
			idxFileDone = i
		case workflow.RunEventStepPrint:
			idxPrint = i
		case workflow.RunEventStepDone:
			idxStepDone = i
		}
	}

	if idxFileDone == -1 {
		t.Fatal("missing file_done")
	}
	if idxPrint == -1 {
		t.Fatal("missing step_print")
	}
	if idxStepDone == -1 {
		t.Fatal("missing step_done")
	}

	// Order: file_done < step_print < step_done
	if !(idxFileDone < idxPrint && idxPrint < idxStepDone) {
		t.Errorf("order wrong: file_done=%d, step_print=%d, step_done=%d (want file_done < step_print < step_done)",
			idxFileDone, idxPrint, idxStepDone)
	}
}

// TestNoPrintOnStopStep verifies that Stop_* steps ignore print (no step_print emitted).
func TestNoPrintOnStopStep(t *testing.T) {
	// Stop_* steps can't have print per spec; even if set, the engine should not emit step_print
	// (the engine guards with stepType != StepTypeStop)
	// We test this indirectly: no step_print should appear for any Stop_* step.
	wf := makeV313LLMFileWorkflow([]string{"/src/test.tsx"})

	adapters := createTestAdapters()
	adapters.LLM.(*workflow.DefaultLLMAdapter).SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		return map[string]interface{}{"content": "x", "model": "gpt-4", "finish_reason": "stop"}, nil
	})

	engine, err := workflow.NewEngine(wf)
	if err != nil {
		t.Fatalf("NewEngine: %v", err)
	}
	result, err := engine.Execute(context.Background(), map[string]interface{}{}, adapters)
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}

	for ev := range result.RunEventStream {
		if ev.Type == workflow.RunEventStepPrint && ev.StepID != nil && *ev.StepID == "Stop_End" {
			t.Errorf("unexpected step_print for Stop_End step")
		}
	}
}