package sdk

import (
	"context"
	"testing"
)

func TestNewEmitter(t *testing.T) {
	tests := []struct {
		name    string
		config  Config
		wantErr bool
	}{
		{
			name: "valid config",
			config: Config{
				ServerURL: "http://localhost:8080",
				Framework: "test-framework",
				ClientID:  "test-client",
				Host:      "test-host",
			},
			wantErr: false,
		},
		{
			name: "missing server URL",
			config: Config{
				Framework: "test-framework",
				ClientID:  "test-client",
			},
			wantErr: true,
		},
		{
			name: "missing framework",
			config: Config{
				ServerURL: "http://localhost:8080",
				ClientID:  "test-client",
			},
			wantErr: true,
		},
		{
			name: "missing client ID",
			config: Config{
				ServerURL: "http://localhost:8080",
				Framework: "test-framework",
			},
			wantErr: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			emitter, err := NewEmitter(tt.config)
			if (err != nil) != tt.wantErr {
				t.Errorf("NewEmitter() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !tt.wantErr {
				_ = emitter.Close(context.Background())
			}
		})
	}
}

func TestGenerateID(t *testing.T) {
	id1 := generateID()
	id2 := generateID()

	if id1 == id2 {
		t.Errorf("generateID() should produce unique IDs, got duplicate: %s", id1)
	}

	if len(id1) == 0 {
		t.Error("generateID() should return a non-empty string")
	}
}

func TestNewSessionStart(t *testing.T) {
	sessionID := "test-session-001"
	event := NewSessionStart(sessionID)

	if event["event"].(map[string]any)["type"] != "session.start" {
		t.Error("NewSessionStart() should create session.start event")
	}

	if event["correlation"].(map[string]any)["session_id"] != sessionID {
		t.Error("NewSessionStart() should set session_id in correlation")
	}

	if event["schema"].(map[string]any)["name"] != schemaName {
		t.Error("NewSessionStart() should set correct schema name")
	}
}

func TestNewRunStart(t *testing.T) {
	sessionID := "test-session-001"
	runID := "test-run-001"
	event := NewRunStart(sessionID, runID)

	if event["event"].(map[string]any)["type"] != "run.start" {
		t.Error("NewRunStart() should create run.start event")
	}

	if event["correlation"].(map[string]any)["session_id"] != sessionID {
		t.Error("NewRunStart() should set session_id in correlation")
	}

	if event["correlation"].(map[string]any)["run_id"] != runID {
		t.Error("NewRunStart() should set run_id in correlation")
	}
}

func TestNewSpanStart(t *testing.T) {
	sessionID := "test-session-001"
	runID := "test-run-001"
	traceID := "test-trace-001"
	spanID := "test-span-001"
	event := NewSpanStart(sessionID, runID, traceID, spanID)

	if event["event"].(map[string]any)["type"] != "span.start" {
		t.Error("NewSpanStart() should create span.start event")
	}

	if event["correlation"].(map[string]any)["span_id"] != spanID {
		t.Error("NewSpanStart() should set span_id in correlation")
	}

	if event["correlation"].(map[string]any)["trace_id"] != traceID {
		t.Error("NewSpanStart() should set trace_id in correlation")
	}
}

func TestNewRunEnd(t *testing.T) {
	sessionID := "test-session-001"
	runID := "test-run-001"
	status := "success"
	durationMs := int64(60000)
	event := NewRunEnd(sessionID, runID, status, durationMs)

	if event["event"].(map[string]any)["type"] != "run.end" {
		t.Error("NewRunEnd() should create run.end event")
	}

	payload := event["payload"].(map[string]any)
	if payload["status"] != status {
		t.Errorf("NewRunEnd() should set status to %s", status)
	}

	if payload["duration_ms"] != durationMs {
		t.Errorf("NewRunEnd() should set duration_ms to %d", durationMs)
	}
}

func TestNewSpanEnd(t *testing.T) {
	sessionID := "test-session-001"
	runID := "test-run-001"
	traceID := "test-trace-001"
	spanID := "test-span-001"
	status := "success"
	durationMs := int64(1000)
	event := NewSpanEnd(sessionID, runID, traceID, spanID, status, durationMs)

	if event["event"].(map[string]any)["type"] != "span.end" {
		t.Error("NewSpanEnd() should create span.end event")
	}

	payload := event["payload"].(map[string]any)
	if payload["status"] != status {
		t.Errorf("NewSpanEnd() should set status to %s", status)
	}

	if payload["duration_ms"] != durationMs {
		t.Errorf("NewSpanEnd() should set duration_ms to %d", durationMs)
	}
}

func TestNewError(t *testing.T) {
	sessionID := "test-session-001"
	runID := "test-run-001"
	traceID := "test-trace-001"
	spanID := "test-span-001"
	errType := "validation"
	message := "invalid input"
	event := NewError(sessionID, runID, traceID, spanID, errType, message)

	if event["event"].(map[string]any)["type"] != "error" {
		t.Error("NewError() should create error event")
	}

	payload := event["payload"].(map[string]any)
	err := payload["error"].(map[string]any)
	if err["type"] != errType {
		t.Errorf("NewError() should set error type to %s", errType)
	}

	if err["message"] != message {
		t.Errorf("NewError() should set error message to %s", message)
	}
}

func TestNewMetricSnapshot(t *testing.T) {
	sessionID := "test-session-001"
	runID := "test-run-001"
	metrics := map[string]any{
		"tokens_in":  1000.0,
		"tokens_out": 500.0,
		"cost_usd":   0.002,
	}
	event := NewMetricSnapshot(sessionID, runID, metrics)

	if event["event"].(map[string]any)["type"] != "metric.snapshot" {
		t.Error("NewMetricSnapshot() should create metric.snapshot event")
	}

	payload := event["payload"].(map[string]any)
	payloadMetrics := payload["metrics"].(map[string]any)
	if len(payloadMetrics) != len(metrics) {
		t.Error("NewMetricSnapshot() should include all metrics")
	}
}

func TestEventOptions(t *testing.T) {
	emitter, err := NewEmitter(Config{
		ServerURL: "http://localhost:8080",
		Framework: "test-framework",
		ClientID:  "test-client",
		Host:      "test-host",
	})
	if err != nil {
		t.Fatalf("NewEmitter() error = %v", err)
	}
	defer emitter.Close(context.Background())

	sessionID := "test-session-001"
	event := NewSessionStart(sessionID,
		WithSource(emitter),
		WithAttributes(map[string]any{"cwd": "/home/user"}),
		WithSeq(1),
	)

	if _, ok := event["event"].(map[string]any)["source"]; !ok {
		t.Error("WithSource() should set source")
	}

	if _, ok := event["attributes"]; !ok {
		t.Error("WithAttributes() should set attributes")
	}

	if event["event"].(map[string]any)["seq"] != 1 {
		t.Error("WithSeq() should set sequence number")
	}
}

func TestWithSpanKind(t *testing.T) {
	sessionID := "test-session-001"
	runID := "test-run-001"
	traceID := "test-trace-001"
	spanID := "test-span-001"
	event := NewSpanStart(sessionID, runID, traceID, spanID, WithSpanKind("tool"))

	attrs := event["attributes"].(map[string]any)
	if attrs["span_kind"] != "tool" {
		t.Error("WithSpanKind() should set span_kind attribute")
	}
}

func TestWithLLMUsage(t *testing.T) {
	sessionID := "test-session-001"
	runID := "test-run-001"
	event := NewRunEnd(sessionID, runID, "success", 60000,
		WithLLMUsage("claude-3-opus", 1000, 500, 0.015),
	)

	payload := event["payload"].(map[string]any)
	llm := payload["llm"].(map[string]any)

	if llm["model"] != "claude-3-opus" {
		t.Error("WithLLMUsage() should set model")
	}

	usage := llm["usage"].(map[string]any)
	if usage["input_tokens"] != 1000 {
		t.Error("WithLLMUsage() should set input_tokens")
	}

	if usage["output_tokens"] != 500 {
		t.Error("WithLLMUsage() should set output_tokens")
	}

	cost := llm["cost"].(map[string]any)
	if cost["total_usd"] != 0.015 {
		t.Error("WithLLMUsage() should set total_usd")
	}
}

func TestEmit(t *testing.T) {
	emitter, err := NewEmitter(Config{
		ServerURL:  "http://localhost:9999",
		Framework:  "test-framework",
		ClientID:   "test-client",
		Host:       "test-host",
		BufferSize: 10,
	})
	if err != nil {
		t.Fatalf("NewEmitter() error = %v", err)
	}

	sessionID := "test-session-001"
	event := NewSessionStart(sessionID, WithSource(emitter))

	ctx := context.Background()

	err = emitter.Emit(ctx, event)
	if err != nil {
		t.Errorf("Emit() error = %v", err)
	}

	err = emitter.Emit(ctx, NewSessionStart(sessionID+"-2", WithSource(emitter)))
	if err != nil {
		t.Errorf("Emit() error = %v", err)
	}

	emitter.mu.Lock()
	buffered := len(emitter.buffer)
	emitter.mu.Unlock()

	if buffered != 2 {
		t.Errorf("Expected 2 buffered events, got %d", buffered)
	}
}

func TestWsURLFromHTTP(t *testing.T) {
	tests := []struct {
		httpURL string
		want    string
	}{
		{"http://localhost:8080", "ws://localhost:8080/v1/ws"},
		{"https://example.com", "wss://example.com/v1/ws"},
		{"http://example.com:8080", "ws://example.com:8080/v1/ws"},
	}

	for _, tt := range tests {
		t.Run(tt.httpURL, func(t *testing.T) {
			if got := wsURLFromHTTP(tt.httpURL); got != tt.want {
				t.Errorf("wsURLFromHTTP() = %v, want %v", got, tt.want)
			}
		})
	}
}