package socket

import (
	"context"
	"net"
	"testing"
	"time"

	altv1 "git.toki-labs.com/toki/alt/packages/contracts/gen/go/alt/v1"
	"git.toki-labs.com/toki/alt/services/worker/internal/config"
	workerContracts "git.toki-labs.com/toki/alt/services/worker/internal/contracts"
	protoSocket "git.toki-labs.com/toki/proto-socket/go"
)

func TestWorkerSocketServerHello(t *testing.T) {
	// Get temporary port
	l, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatalf("failed to listen on temporary port: %v", err)
	}
	port := l.Addr().(*net.TCPAddr).Port
	l.Close()

	cfg := config.Config{
		Host:       "127.0.0.1",
		Port:       port,
		SocketPath: "/socket",
	}

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	server := NewServer(cfg, BacktestDeps{})
	if err := server.Start(ctx); err != nil {
		t.Fatalf("failed to start worker socket server: %v", err)
	}
	defer server.Stop()

	// Wait slightly for server setup
	time.Sleep(50 * time.Millisecond)

	// Dial
	client, err := protoSocket.DialWs(ctx, "127.0.0.1", port, "/socket", workerContracts.ParserMap())
	if err != nil {
		t.Fatalf("failed to dial worker socket server: %v", err)
	}
	defer client.Close()

	// Send HelloRequest
	req := &altv1.HelloRequest{
		AltProtocolVersion: "alt.v1",
	}

	res, err := protoSocket.SendRequestTyped[*altv1.HelloRequest, *altv1.HelloResponse](&client.Communicator, req, 2*time.Second)
	if err != nil {
		t.Fatalf("failed to send HelloRequest: %v", err)
	}

	if res.ServerName != "alt-worker" {
		t.Errorf("expected ServerName to be %q, got %q", "alt-worker", res.ServerName)
	}
	if res.AltProtocolVersion != "alt.v1" {
		t.Errorf("expected AltProtocolVersion to be %q, got %q", "alt.v1", res.AltProtocolVersion)
	}

	// Assert no backtest-start or worker-execution since BacktestDeps{} has no Starter.
	for _, cap := range res.Capabilities {
		if cap == "backtest-start" || cap == "worker-execution" {
			t.Errorf("expected capability %q to be omitted when Starter is nil", cap)
		}
	}
}

func TestSessionHandlers(t *testing.T) {
	handlers := sessionHandlers(BacktestDeps{})

	hasHello := false
	seenTypes := make(map[string]bool)

	for _, h := range handlers {
		if h.requestType == "" {
			t.Error("handler requestType cannot be empty")
		}
		if h.register == nil {
			t.Errorf("handler for %q has nil register function", h.requestType)
		}

		if seenTypes[h.requestType] {
			t.Errorf("duplicate handler registration for requestType %q", h.requestType)
		}
		seenTypes[h.requestType] = true

		if h.requestType == "alt.v1.HelloRequest" {
			hasHello = true
		}
	}

	if !hasHello {
		t.Error("expected alt.v1.HelloRequest to be registered in session handlers")
	}
}

func TestRegisterHandlers(t *testing.T) {
	t.Run("skip nil register", func(t *testing.T) {
		handlers := []sessionHandler{
			{
				requestType: "test.DummyRequest",
				register:    nil,
			},
		}
		registerHandlers(nil, handlers)
	})
}

func TestWorkerHelloCapabilitiesReflectDeps(t *testing.T) {
	tests := []struct {
		name     string
		deps     Deps
		expected []string
	}{
		{
			name:     "no deps",
			deps:     Deps{},
			expected: []string{"hello"},
		},
		{
			name: "market deps",
			deps: Deps{
				Instruments: &fakeInstrumentStore{},
				Bars:        &fakeBarStore{},
			},
			expected: []string{"hello", "market-read"},
		},
		{
			name: "backtest read deps",
			deps: Deps{
				Analysis: &fakeAnalysisStore{},
				Results:  &fakeResultStore{},
			},
			expected: []string{"hello", "backtest-read"},
		},
		{
			name: "starter deps",
			deps: Deps{
				Starter: &fakeStarter{},
			},
			expected: []string{"hello", "backtest-start", "worker-execution"},
		},
		{
			name: "all deps",
			deps: Deps{
				Instruments: &fakeInstrumentStore{},
				Bars:        &fakeBarStore{},
				Analysis:    &fakeAnalysisStore{},
				Results:     &fakeResultStore{},
				Starter:     &fakeStarter{},
			},
			expected: []string{"hello", "market-read", "backtest-read", "backtest-start", "worker-execution"},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			caps := capabilitiesForDeps(tt.deps)
			if len(caps) != len(tt.expected) {
				t.Fatalf("expected caps %v, got %v", tt.expected, caps)
			}
			for i, v := range tt.expected {
				if caps[i] != v {
					t.Errorf("expected cap at %d to be %q, got %q", i, v, caps[i])
				}
			}
		})
	}
}

func TestWorkerCapabilitiesDoNotClaimUnavailableStart(t *testing.T) {
	caps := capabilitiesForDeps(Deps{})
	for _, cap := range caps {
		if cap == "backtest-start" || cap == "worker-execution" {
			t.Errorf("capabilities for empty Deps{} should not claim unavailable start, but got %q", cap)
		}
	}
}