package notify

import (
	"testing"
	"time"
)

func TestClientTransferMonitorTracksSendLifecycle(t *testing.T) {
	client := NewClient().(*ClientCommon)
	monitor := client.getFileTransferState().monitorView()
	now := time.Unix(100, 0)

	client.publishSendFileEvent(FileEvent{
		NetType: NET_CLIENT,
		Kind:    EnvelopeFileMeta,
		Packet:  FilePacket{FileID: "send-1", Size: 100},
		Path:    "/tmp/send-1.bin",
		Total:   100,
		Time:    now,
	})
	client.publishSendFileEvent(FileEvent{
		NetType:      NET_CLIENT,
		Kind:         EnvelopeFileChunk,
		Packet:       FilePacket{FileID: "send-1", Size: 100},
		Path:         "/tmp/send-1.bin",
		Received:     40,
		Total:        100,
		Percent:      40,
		StartedAt:    now,
		UpdatedAt:    now.Add(2 * time.Second),
		Duration:     2 * time.Second,
		RateBPS:      20,
		Time:         now.Add(2 * time.Second),
		StepDuration: 2 * time.Second,
	})

	active := monitor.activeSnapshots()
	if got, want := len(active), 1; got != want {
		t.Fatalf("active count mismatch: got %d want %d", got, want)
	}
	if got, want := active[0].Direction, fileTransferDirectionSend; got != want {
		t.Fatalf("direction mismatch: got %v want %v", got, want)
	}
	if got, want := active[0].Scope, clientFileScope(); got != want {
		t.Fatalf("scope mismatch: got %q want %q", got, want)
	}
	if got, want := active[0].Received, int64(40); got != want {
		t.Fatalf("received mismatch: got %d want %d", got, want)
	}
	snapshot, ok := monitor.latestSnapshot(fileTransferDirectionSend, clientFileScope(), "send-1")
	if !ok {
		t.Fatal("latest snapshot should exist while active")
	}
	if got, want := snapshot.Kind, EnvelopeFileChunk; got != want {
		t.Fatalf("latest active kind mismatch: got %v want %v", got, want)
	}
	if got, want := snapshot.Received, int64(40); got != want {
		t.Fatalf("latest active received mismatch: got %d want %d", got, want)
	}

	client.publishSendFileEvent(FileEvent{
		NetType:   NET_CLIENT,
		Kind:      EnvelopeFileEnd,
		Packet:    FilePacket{FileID: "send-1", Size: 100},
		Path:      "/tmp/send-1.bin",
		Received:  100,
		Total:     100,
		Percent:   100,
		Done:      true,
		StartedAt: now,
		UpdatedAt: now.Add(4 * time.Second),
		Duration:  4 * time.Second,
		RateBPS:   25,
		Time:      now.Add(4 * time.Second),
	})

	active = monitor.activeSnapshots()
	if got, want := len(active), 0; got != want {
		t.Fatalf("active count after end mismatch: got %d want %d", got, want)
	}
	completed := monitor.completedSnapshots()
	if got, want := len(completed), 1; got != want {
		t.Fatalf("completed count mismatch: got %d want %d", got, want)
	}
	if got, want := completed[0].Done, true; got != want {
		t.Fatalf("done mismatch: got %v want %v", got, want)
	}
	if got, want := completed[0].Received, int64(100); got != want {
		t.Fatalf("completed received mismatch: got %d want %d", got, want)
	}
	snapshot, ok = monitor.latestSnapshot(fileTransferDirectionSend, clientFileScope(), "send-1")
	if !ok {
		t.Fatal("latest snapshot should exist after completion")
	}
	if got, want := snapshot.Kind, EnvelopeFileEnd; got != want {
		t.Fatalf("latest completed kind mismatch: got %v want %v", got, want)
	}
	if got, want := snapshot.Done, true; got != want {
		t.Fatalf("latest completed done mismatch: got %v want %v", got, want)
	}
}

func TestServerTransferMonitorUsesClientScope(t *testing.T) {
	server := NewServer().(*ServerCommon)
	monitor := server.getFileTransferState().monitorView()
	client := &ClientConn{ClientID: "client-1"}
	now := time.Unix(200, 0)

	server.publishReceivedFileEvent(FileEvent{
		NetType:    NET_SERVER,
		ClientConn: client,
		Kind:       EnvelopeFileChunk,
		Packet:     FilePacket{FileID: "recv-1", Size: 50},
		Path:       "/tmp/recv-1.part",
		Received:   20,
		Total:      50,
		Percent:    40,
		StartedAt:  now,
		UpdatedAt:  now.Add(time.Second),
		Duration:   time.Second,
		RateBPS:    20,
		Time:       now.Add(time.Second),
	})

	active := monitor.activeSnapshots()
	if got, want := len(active), 1; got != want {
		t.Fatalf("active count mismatch: got %d want %d", got, want)
	}
	if got, want := active[0].Direction, fileTransferDirectionReceive; got != want {
		t.Fatalf("direction mismatch: got %v want %v", got, want)
	}
	if got, want := active[0].Scope, serverFileScope(client); got != want {
		t.Fatalf("scope mismatch: got %q want %q", got, want)
	}
	if got, want := active[0].FileID, "recv-1"; got != want {
		t.Fatalf("fileID mismatch: got %q want %q", got, want)
	}
}

func TestTransferMonitorDirectionQueries(t *testing.T) {
	monitor := newFileTransferMonitor()
	now := time.Unix(300, 0)

	monitor.observe(fileTransferDirectionSend, FileEvent{
		Kind:     EnvelopeFileChunk,
		Packet:   FilePacket{FileID: "shared", Size: 10},
		Received: 4,
		Total:    10,
		Time:     now,
	})
	monitor.observe(fileTransferDirectionReceive, FileEvent{
		Kind:     EnvelopeFileChunk,
		Packet:   FilePacket{FileID: "shared", Size: 10},
		Received: 7,
		Total:    10,
		Time:     now.Add(time.Second),
	})

	sendSnapshots := monitor.activeSnapshotsByDirection(fileTransferDirectionSend)
	if got, want := len(sendSnapshots), 1; got != want {
		t.Fatalf("send snapshots count mismatch: got %d want %d", got, want)
	}
	if got, want := sendSnapshots[0].Received, int64(4); got != want {
		t.Fatalf("send snapshot received mismatch: got %d want %d", got, want)
	}

	recvSnapshots := monitor.activeSnapshotsByDirection(fileTransferDirectionReceive)
	if got, want := len(recvSnapshots), 1; got != want {
		t.Fatalf("recv snapshots count mismatch: got %d want %d", got, want)
	}
	if got, want := recvSnapshots[0].Received, int64(7); got != want {
		t.Fatalf("recv snapshot received mismatch: got %d want %d", got, want)
	}

	sendSnapshot, ok := monitor.latestSnapshot(fileTransferDirectionSend, clientFileScope(), "shared")
	if !ok {
		t.Fatal("send latest snapshot should exist")
	}
	if got, want := sendSnapshot.Received, int64(4); got != want {
		t.Fatalf("send latest received mismatch: got %d want %d", got, want)
	}

	recvSnapshot, ok := monitor.latestSnapshot(fileTransferDirectionReceive, clientFileScope(), "shared")
	if !ok {
		t.Fatal("recv latest snapshot should exist")
	}
	if got, want := recvSnapshot.Received, int64(7); got != want {
		t.Fatalf("recv latest received mismatch: got %d want %d", got, want)
	}
}

func TestTransferMonitorSnapshotsByFileID(t *testing.T) {
	monitor := newFileTransferMonitor()
	now := time.Unix(400, 0)
	serverClientA := &ClientConn{ClientID: "client-a"}
	serverClientB := &ClientConn{ClientID: "client-b"}

	monitor.observe(fileTransferDirectionSend, FileEvent{
		Kind:     EnvelopeFileChunk,
		Packet:   FilePacket{FileID: "shared", Size: 20},
		Received: 8,
		Total:    20,
		Time:     now,
	})
	monitor.observe(fileTransferDirectionReceive, FileEvent{
		ClientConn: serverClientA,
		Kind:       EnvelopeFileChunk,
		Packet:     FilePacket{FileID: "shared", Size: 20},
		Received:   12,
		Total:      20,
		Time:       now.Add(time.Second),
	})
	monitor.observe(fileTransferDirectionReceive, FileEvent{
		ClientConn: serverClientB,
		Kind:       EnvelopeFileEnd,
		Packet:     FilePacket{FileID: "shared", Size: 20},
		Received:   20,
		Total:      20,
		Done:       true,
		Time:       now.Add(2 * time.Second),
	})

	allSnapshots := monitor.snapshotsByFileID("shared")
	if got, want := len(allSnapshots), 3; got != want {
		t.Fatalf("all snapshots count mismatch: got %d want %d", got, want)
	}
	if got, want := allSnapshots[0].Direction, fileTransferDirectionReceive; got != want {
		t.Fatalf("first snapshot direction mismatch: got %v want %v", got, want)
	}
	if got, want := allSnapshots[0].Scope, serverFileScope(serverClientA); got != want {
		t.Fatalf("first snapshot scope mismatch: got %q want %q", got, want)
	}
	if got, want := allSnapshots[1].Scope, serverFileScope(serverClientB); got != want {
		t.Fatalf("second snapshot scope mismatch: got %q want %q", got, want)
	}
	if got, want := allSnapshots[2].Direction, fileTransferDirectionSend; got != want {
		t.Fatalf("third snapshot direction mismatch: got %v want %v", got, want)
	}

	recvSnapshots := monitor.snapshotsByDirectionAndFileID(fileTransferDirectionReceive, "shared")
	if got, want := len(recvSnapshots), 2; got != want {
		t.Fatalf("recv snapshots count mismatch: got %d want %d", got, want)
	}
	if got, want := recvSnapshots[0].Scope, serverFileScope(serverClientA); got != want {
		t.Fatalf("recv first scope mismatch: got %q want %q", got, want)
	}
	if got, want := recvSnapshots[1].Scope, serverFileScope(serverClientB); got != want {
		t.Fatalf("recv second scope mismatch: got %q want %q", got, want)
	}
	if got, want := recvSnapshots[1].Done, true; got != want {
		t.Fatalf("recv completed snapshot mismatch: got %v want %v", got, want)
	}

	sendSnapshots := monitor.snapshotsByDirectionAndFileID(fileTransferDirectionSend, "shared")
	if got, want := len(sendSnapshots), 1; got != want {
		t.Fatalf("send snapshots count mismatch: got %d want %d", got, want)
	}
	if got, want := sendSnapshots[0].Received, int64(8); got != want {
		t.Fatalf("send snapshot received mismatch: got %d want %d", got, want)
	}
}

func TestTransferMonitorCompletedRetentionEvictsOldest(t *testing.T) {
	monitor := newFileTransferMonitorWithCompletedLimit(2)
	now := time.Unix(500, 0)

	monitor.observe(fileTransferDirectionSend, FileEvent{
		Kind:     EnvelopeFileChunk,
		Packet:   FilePacket{FileID: "active-1", Size: 10},
		Received: 3,
		Total:    10,
		Time:     now,
	})
	monitor.observe(fileTransferDirectionSend, FileEvent{
		Kind:     EnvelopeFileEnd,
		Packet:   FilePacket{FileID: "done-1", Size: 10},
		Received: 10,
		Total:    10,
		Done:     true,
		Time:     now.Add(time.Second),
	})
	monitor.observe(fileTransferDirectionSend, FileEvent{
		Kind:     EnvelopeFileEnd,
		Packet:   FilePacket{FileID: "done-2", Size: 10},
		Received: 10,
		Total:    10,
		Done:     true,
		Time:     now.Add(2 * time.Second),
	})
	monitor.observe(fileTransferDirectionSend, FileEvent{
		Kind:     EnvelopeFileEnd,
		Packet:   FilePacket{FileID: "done-3", Size: 10},
		Received: 10,
		Total:    10,
		Done:     true,
		Time:     now.Add(3 * time.Second),
	})

	active := monitor.activeSnapshots()
	if got, want := len(active), 1; got != want {
		t.Fatalf("active count mismatch: got %d want %d", got, want)
	}
	if got, want := active[0].FileID, "active-1"; got != want {
		t.Fatalf("active fileID mismatch: got %q want %q", got, want)
	}

	completed := monitor.completedSnapshots()
	if got, want := len(completed), 2; got != want {
		t.Fatalf("completed count mismatch: got %d want %d", got, want)
	}
	if got, want := completed[0].FileID, "done-2"; got != want {
		t.Fatalf("first completed fileID mismatch: got %q want %q", got, want)
	}
	if got, want := completed[1].FileID, "done-3"; got != want {
		t.Fatalf("second completed fileID mismatch: got %q want %q", got, want)
	}

	if _, ok := monitor.latestSnapshot(fileTransferDirectionSend, clientFileScope(), "done-1"); ok {
		t.Fatal("oldest completed snapshot should be evicted")
	}
	if _, ok := monitor.latestSnapshot(fileTransferDirectionSend, clientFileScope(), "done-3"); !ok {
		t.Fatal("latest completed snapshot should be retained")
	}
	if snapshot, ok := monitor.latestSnapshot(fileTransferDirectionSend, clientFileScope(), "active-1"); !ok {
		t.Fatal("active snapshot should remain available")
	} else if got, want := snapshot.Kind, EnvelopeFileChunk; got != want {
		t.Fatalf("active latest kind mismatch: got %v want %v", got, want)
	}
}