"""Regression: event factory shapes (UI relies on these field names)."""

from api.analyses.types import Finding
from api.runtime import events
from api.runtime.context import current_analysis


def test_run_start_shape():
    e = events.run_start("why?")
    assert e == {"type": "run_start", "question": "why?"}


def test_run_end_shape():
    assert events.run_end(answer="42") == {"type": "run_end", "answer": "42", "error": None}
    assert events.run_end(error="boom") == {"type": "run_end", "answer": "", "error": "boom"}


def test_plan_ready_shape():
    e = events.plan_ready("rat", [{"analysis": "x", "args": {}, "why": ""}])
    assert e["type"] == "plan_ready"
    assert e["rationale"] == "rat"
    assert isinstance(e["steps"], list)


def test_analysis_start_shape():
    e = events.analysis_start("direct_answer", {"q": "?"}, "fits", step_id="direct_answer#0")
    assert e == {
        "type": "analysis_start",
        "analysis": "direct_answer",
        "step_id": "direct_answer#0",
        "args": {"q": "?"},
        "why": "fits",
    }


def test_analysis_end_uses_finding():
    f = Finding(analysis="direct_answer", summary="ok", rows=[{"a": 1}], sql=["SELECT 1"])
    e = events.analysis_end("direct_answer", f, step_id="direct_answer#0")
    assert e["type"] == "analysis_end"
    assert e["analysis"] == "direct_answer"
    assert e["step_id"] == "direct_answer#0"
    assert e["summary"] == "ok"
    assert e["error"] is None
    assert e["row_count"] == 1


def test_analysis_fallback_shape():
    e = events.analysis_fallback(
        primary="drill_down", fallback="direct_answer",
        reason="empty result", step_id="direct_answer#0.fallback",
    )
    assert e == {
        "type": "analysis_fallback",
        "primary": "drill_down",
        "fallback": "direct_answer",
        "reason": "empty result",
        "step_id": "direct_answer#0.fallback",
    }


def test_tool_call_shapes_carry_analysis_field():
    """Tool/LLM events must include the active Analysis name from the
    contextvar — UI groups sub-events by it. None when outside an Analysis."""
    # Outside any Analysis: analysis is None.
    s = events.tool_call_start("compose_sql", input={"q": "?"})
    assert s["type"] == "tool_call_start"
    assert s["tool"] == "compose_sql"
    assert s["analysis"] is None
    assert s["input"] == {"q": "?"}

    e = events.tool_call_end("compose_sql", output={"sql": "..."})
    assert e["analysis"] is None
    assert e["output"] == {"sql": "..."}
    assert e["error"] is None

    # Inside an Analysis context: analysis field is populated.
    token = current_analysis.set("direct_answer#0")
    try:
        s2 = events.tool_call_start("execute_sql", input={"sql": "SELECT 1"})
        e2 = events.tool_call_end("execute_sql", output={"row_count": 1})
        assert s2["analysis"] == "direct_answer#0"
        assert e2["analysis"] == "direct_answer#0"
    finally:
        current_analysis.reset(token)


def test_llm_call_carries_analysis_field():
    token = current_analysis.set("compare_periods#0")
    try:
        e = events.llm_call("compare_periods.interpret", system_len=100, user_len=200)
        assert e["type"] == "llm_call"
        assert e["analysis"] == "compare_periods#0"
        assert e["system_chars"] == 100
        assert e["user_chars"] == 200
    finally:
        current_analysis.reset(token)


def test_synth_start_shape():
    assert events.synth_start() == {"type": "synth_start"}


def test_sse_format_round_trip():
    payload = events.tool_call_start("t", input={"x": 1})
    formatted = events.sse_format(payload)
    assert formatted.startswith("event: tool_call_start\n")
    assert "data: " in formatted
    assert formatted.endswith("\n\n")