from metrics_helpers import (
    build_local_metric_record,
    estimate_tokens_from_chars,
    summarize_local_metrics,
    summarize_session_rows,
)


def test_estimate_tokens_from_chars_uses_simple_local_heuristic() -> None:
    assert estimate_tokens_from_chars(0) == 0
    assert estimate_tokens_from_chars(1) == 1
    assert estimate_tokens_from_chars(4) == 1
    assert estimate_tokens_from_chars(5) == 2
    assert estimate_tokens_from_chars(401) == 101


def test_build_local_metric_record_adds_token_and_throughput_estimates() -> None:
    record = build_local_metric_record(
        prompt="abcd" * 10,
        response="xyz" * 20,
        model="hermes4:14b",
        caller="heartbeat_tick",
        session_id="session-123",
        latency_s=2.0,
        success=True,
    )

    assert record["model"] == "hermes4:14b"
    assert record["caller"] == "heartbeat_tick"
    assert record["session_id"] == "session-123"
    assert record["est_input_tokens"] == 10
    assert record["est_output_tokens"] == 15
    assert record["tokens_per_second"] == 12.5


def test_summarize_local_metrics_rolls_up_tokens_and_latency() -> None:
    records = [
        {
            "caller": "heartbeat_tick",
            "model": "hermes4:14b",
            "success": True,
            "est_input_tokens": 100,
            "est_output_tokens": 40,
            "latency_s": 2.0,
            "tokens_per_second": 20.0,
        },
        {
            "caller": "heartbeat_tick",
            "model": "hermes4:14b",
            "success": False,
            "est_input_tokens": 30,
            "est_output_tokens": 0,
            "latency_s": 1.0,
        },
        {
            "caller": "session_export",
            "model": "hermes3:8b",
            "success": True,
            "est_input_tokens": 50,
            "est_output_tokens": 25,
            "latency_s": 5.0,
            "tokens_per_second": 5.0,
        },
    ]

    summary = summarize_local_metrics(records)

    assert summary["total_calls"] == 3
    assert summary["successful_calls"] == 2
    assert summary["failed_calls"] == 1
    assert summary["input_tokens"] == 180
    assert summary["output_tokens"] == 65
    assert summary["total_tokens"] == 245
    assert summary["avg_latency_s"] == 2.67
    assert summary["avg_tokens_per_second"] == 12.5
    assert summary["by_caller"]["heartbeat_tick"]["total_tokens"] == 170
    assert summary["by_model"]["hermes4:14b"]["failed_calls"] == 1


def test_summarize_session_rows_separates_local_and_cloud_estimates() -> None:
    rows = [
        ("hermes4:14b", "local", 2, 10, 4),
        ("claude-sonnet-4-6", "cli", 3, 9, 2),
    ]

    summary = summarize_session_rows(rows)

    assert summary["total_sessions"] == 5
    assert summary["local_sessions"] == 2
    assert summary["cloud_sessions"] == 3
    assert summary["local_est_tokens"] == 5000
    assert summary["cloud_est_tokens"] == 4500
    assert summary["cloud_est_cost_usd"] > 0