import (
    "os"
    fact0 "github.com/fact0-ai/fact0/sdk/go"
)

client := fact0.NewClient(fact0.Config{
    APIKey: os.Getenv("FACT0_API_KEY"),
})
tel := client.Telemetry

// 1. Start the execution
exec, err := tel.StartExecution(context.Background(), fact0.StartExecutionRequest{
    AgentID:   "customer-support-bot",
    AgentName: "Support Bot",
    Trigger:   "user_query",
})
if err != nil {
    log.Fatal(err)
}
executionID := exec["id"].(string)

// 2. Ingest spans with parent-child relationships
_, err = tel.IngestSpans(context.Background(), executionID, []map[string]interface{}{
    {
        "span_id":    "span-1",
        "span_type":  "TOOL_CALL",
        "name":       "Search Knowledge Base",
        "start_time": "2026-06-22T22:00:00Z",
        "end_time":   "2026-06-22T22:00:00.210Z",
        "tool_call": map[string]interface{}{
            "tool_name":   "knowledge_search",
            "duration_ms": 210,
            "input":       map[string]interface{}{"inline": map[string]interface{}{"query": "refund policy"}},
            "output":      map[string]interface{}{"inline": map[string]interface{}{"hits": 5}},
        },
    },
    {
        "span_id":        "span-2",
        "span_type":      "MODEL_INVOCATION",
        "name":           "Generate Answer",
        "parent_span_id": "span-1",
        "start_time":     "2026-06-22T22:00:00.210Z",
        "end_time":       "2026-06-22T22:00:01.450Z",
        "model_invocation": map[string]interface{}{
            "model_name":        "gpt-4o",
            "model_provider":    "openai",
            "prompt_tokens":     1200,
            "completion_tokens": 250,
            "total_tokens":      1450,
            "session_id":        "session_9a2f1b",
            "turn_sequence":     2,
            "prompt_name":       "customer-inquiry",
            "prompt_version":    3,
            "cost_usd":          0.00725,
        },
    },
})
if err != nil {
    log.Fatal(err)
}