package notify

import (
	"context"
	"errors"
	"os"
	"path/filepath"
	"testing"
	"time"
)

func TestFileSendSessionProgress(t *testing.T) {
	session := &fileSendSession{
		fileID:    "file-1",
		path:      "/tmp/demo.bin",
		name:      "demo.bin",
		size:      200,
		checksum:  "sum",
		startedAt: time.Unix(100, 0),
		updatedAt: time.Unix(100, 0),
	}

	metaEvent := session.onMetaSent(time.Unix(100, 0))
	if got, want := metaEvent.Kind, EnvelopeFileMeta; got != want {
		t.Fatalf("meta kind mismatch: got %v want %v", got, want)
	}
	if got, want := metaEvent.Total, int64(200); got != want {
		t.Fatalf("meta total mismatch: got %d want %d", got, want)
	}
	if got, want := metaEvent.Received, int64(0); got != want {
		t.Fatalf("meta received mismatch: got %d want %d", got, want)
	}

	chunkEvent, err := session.onChunkSent(0, 80, time.Unix(104, 0))
	if err != nil {
		t.Fatalf("onChunkSent failed: %v", err)
	}
	if got, want := chunkEvent.Received, int64(80); got != want {
		t.Fatalf("chunk received mismatch: got %d want %d", got, want)
	}
	if got, want := chunkEvent.Percent, 40.0; got != want {
		t.Fatalf("chunk percent mismatch: got %v want %v", got, want)
	}
	if got, want := chunkEvent.Duration, 4*time.Second; got != want {
		t.Fatalf("chunk duration mismatch: got %v want %v", got, want)
	}
	if got, want := chunkEvent.StepDuration, 4*time.Second; got != want {
		t.Fatalf("chunk step duration mismatch: got %v want %v", got, want)
	}
	if got, want := chunkEvent.InstantRateBPS, 20.0; got != want {
		t.Fatalf("chunk instant rate mismatch: got %v want %v", got, want)
	}

	secondChunkEvent, err := session.onChunkSent(80, 120, time.Unix(108, 0))
	if err != nil {
		t.Fatalf("second onChunkSent failed: %v", err)
	}
	if got, want := secondChunkEvent.Received, int64(200); got != want {
		t.Fatalf("second chunk received mismatch: got %d want %d", got, want)
	}
	if got, want := secondChunkEvent.Percent, 100.0; got != want {
		t.Fatalf("second chunk percent mismatch: got %v want %v", got, want)
	}
	if got, want := secondChunkEvent.RateBPS, 25.0; got != want {
		t.Fatalf("second chunk rate mismatch: got %v want %v", got, want)
	}
	if got, want := secondChunkEvent.StepDuration, 4*time.Second; got != want {
		t.Fatalf("second chunk step duration mismatch: got %v want %v", got, want)
	}
	if got, want := secondChunkEvent.InstantRateBPS, 30.0; got != want {
		t.Fatalf("second chunk instant rate mismatch: got %v want %v", got, want)
	}

	endEvent := session.onEndSent(time.Unix(110, 0))
	if !endEvent.Done {
		t.Fatal("end event should be done")
	}
	if got, want := endEvent.Received, int64(200); got != want {
		t.Fatalf("end received mismatch: got %d want %d", got, want)
	}
	if got, want := endEvent.Percent, 100.0; got != want {
		t.Fatalf("end percent mismatch: got %v want %v", got, want)
	}
	if got, want := endEvent.Duration, 10*time.Second; got != want {
		t.Fatalf("end duration mismatch: got %v want %v", got, want)
	}
	if got, want := endEvent.StepDuration, 2*time.Second; got != want {
		t.Fatalf("end step duration mismatch: got %v want %v", got, want)
	}
	if got, want := endEvent.RateBPS, 20.0; got != want {
		t.Fatalf("end rate mismatch: got %v want %v", got, want)
	}
	if got, want := endEvent.InstantRateBPS, 0.0; got != want {
		t.Fatalf("end instant rate mismatch: got %v want %v", got, want)
	}
}

func TestSendFileWithHooksLogsLocalProgress(t *testing.T) {
	dir := t.TempDir()
	filePath := filepath.Join(dir, "demo.txt")
	data := []byte("hello notify send progress")
	if err := os.WriteFile(filePath, data, 0o644); err != nil {
		t.Fatalf("WriteFile failed: %v", err)
	}

	var sentKinds []EnvelopeKind
	var events []FileEvent
	err := sendFileWithHooks(context.Background(), filePath, fileSendHooks{
		sendReliable: func(ctx context.Context, env Envelope) error {
			sentKinds = append(sentKinds, env.Kind)
			return nil
		},
		sendAbort: func(fileID string, stage string, offset int64, cause error) error {
			t.Fatalf("unexpected abort: fileID=%s stage=%s offset=%d err=%v", fileID, stage, offset, cause)
			return nil
		},
		publishEvent: func(event FileEvent) {
			events = append(events, event)
		},
	})
	if err != nil {
		t.Fatalf("sendFileWithHooks failed: %v", err)
	}

	if got, want := len(sentKinds), 3; got != want {
		t.Fatalf("sent kinds count mismatch: got %d want %d", got, want)
	}
	if sentKinds[0] != EnvelopeFileMeta || sentKinds[1] != EnvelopeFileChunk || sentKinds[2] != EnvelopeFileEnd {
		t.Fatalf("unexpected sent kinds: %v", sentKinds)
	}

	if got, want := len(events), 3; got != want {
		t.Fatalf("event count mismatch: got %d want %d", got, want)
	}
	if events[0].Kind != EnvelopeFileMeta || events[1].Kind != EnvelopeFileChunk || events[2].Kind != EnvelopeFileEnd {
		t.Fatalf("unexpected event kinds: %+v", []EnvelopeKind{events[0].Kind, events[1].Kind, events[2].Kind})
	}
	if got, want := events[1].Received, int64(len(data)); got != want {
		t.Fatalf("chunk received mismatch: got %d want %d", got, want)
	}
	if !events[2].Done {
		t.Fatal("end event should be done")
	}
	if got, want := events[2].Received, int64(len(data)); got != want {
		t.Fatalf("end received mismatch: got %d want %d", got, want)
	}
	if got, want := events[2].Path, filePath; got != want {
		t.Fatalf("end path mismatch: got %q want %q", got, want)
	}
	if events[0].Packet.FileID == "" {
		t.Fatal("fileID should not be empty")
	}
	if events[0].Packet.FileID != events[1].Packet.FileID || events[1].Packet.FileID != events[2].Packet.FileID {
		t.Fatalf("fileID should stay stable across events: %+v", events)
	}
}

func TestSendFileWithHooksAbortOnChunkFailure(t *testing.T) {
	dir := t.TempDir()
	filePath := filepath.Join(dir, "demo.txt")
	data := []byte("hello notify send failure")
	if err := os.WriteFile(filePath, data, 0o644); err != nil {
		t.Fatalf("WriteFile failed: %v", err)
	}

	wantErr := errors.New("chunk ack timeout")
	var abortFileID string
	var abortStage string
	var abortOffset int64
	var abortCause error
	var events []FileEvent

	err := sendFileWithHooks(context.Background(), filePath, fileSendHooks{
		sendReliable: func(ctx context.Context, env Envelope) error {
			if env.Kind == EnvelopeFileChunk {
				return wantErr
			}
			return nil
		},
		sendAbort: func(fileID string, stage string, offset int64, cause error) error {
			abortFileID = fileID
			abortStage = stage
			abortOffset = offset
			abortCause = cause
			return nil
		},
		publishEvent: func(event FileEvent) {
			events = append(events, event)
		},
	})
	if !errors.Is(err, wantErr) {
		t.Fatalf("sendFileWithHooks error mismatch: got %v want %v", err, wantErr)
	}
	if abortFileID == "" {
		t.Fatal("abort should capture fileID")
	}
	if got, want := abortStage, "chunk"; got != want {
		t.Fatalf("abort stage mismatch: got %q want %q", got, want)
	}
	if got, want := abortOffset, int64(0); got != want {
		t.Fatalf("abort offset mismatch: got %d want %d", got, want)
	}
	if !errors.Is(abortCause, wantErr) {
		t.Fatalf("abort cause mismatch: got %v want %v", abortCause, wantErr)
	}
	if got, want := len(events), 2; got != want {
		t.Fatalf("event count mismatch: got %d want %d", got, want)
	}
	if got, want := events[0].Kind, EnvelopeFileMeta; got != want {
		t.Fatalf("first event kind mismatch: got %v want %v", got, want)
	}
	if got, want := events[1].Kind, EnvelopeFileAbort; got != want {
		t.Fatalf("abort event kind mismatch: got %v want %v", got, want)
	}
	if got, want := events[1].Packet.Stage, "chunk"; got != want {
		t.Fatalf("abort packet stage mismatch: got %q want %q", got, want)
	}
	if got, want := events[1].Received, int64(0); got != want {
		t.Fatalf("abort received mismatch: got %d want %d", got, want)
	}
	if !errors.Is(events[1].Err, wantErr) {
		t.Fatalf("abort event error mismatch: got %v want %v", events[1].Err, wantErr)
	}
}