import json
import tempfile
from pathlib import Path

from markovian_rsa_mlx.audit import (
    AuditWriter,
    RunStartEvent,
    TraceCompleteEvent,
    TailExtractedEvent,
    AggregationPromptEvent,
    RoundCompleteEvent,
    FinalEvent,
    RunEndEvent,
)
from markovian_rsa_mlx.config import RSAConfig


def test_writer_emits_jsonl(tmp_path: Path):
    audit_path = tmp_path / "audit.jsonl"
    writer = AuditWriter(audit_path)
    writer.write(RunStartEvent(
        run_id="run-1",
        model_id="kyr0/zaya1-base-8b-MLX",
        quantization="q4_g64",
        config=RSAConfig(),
        prompt="2+2",
        created_at="2026-05-10T00:00:00Z",
    ))
    writer.write(TraceCompleteEvent(
        run_id="run-1",
        round=0,
        trace_id="t0",
        text="The answer is 4.",
        token_ids=[1, 2, 3],
        generated_tokens=3,
        finish_reason="eos",
        elapsed_s=0.5,
    ))
    writer.close()

    lines = audit_path.read_text().strip().split("\n")
    assert len(lines) == 2
    e0 = json.loads(lines[0])
    assert e0["event"] == "run_start"
    assert e0["model_id"] == "kyr0/zaya1-base-8b-MLX"
    assert e0["config"]["rounds"] == 2
    e1 = json.loads(lines[1])
    assert e1["event"] == "trace_complete"
    assert e1["text"] == "The answer is 4."
    assert e1["finish_reason"] == "eos"


def test_event_serialization_includes_event_field():
    ev = TailExtractedEvent(
        run_id="r", round=0, trace_id="t",
        tail_token_ids=[1, 2, 3], tail_text="hi", tail_tokens=3,
    )
    payload = ev.to_dict()
    assert payload["event"] == "tail_extracted"


def test_writer_appends_subsequent_events(tmp_path: Path):
    audit_path = tmp_path / "audit.jsonl"
    w = AuditWriter(audit_path)
    w.write(RunEndEvent(run_id="r", elapsed_s=1.0,
                        total_generated_tokens=10, peak_memory_bytes=1000))
    w.close()
    w2 = AuditWriter(audit_path, mode="a")
    w2.write(RunEndEvent(run_id="r2", elapsed_s=2.0,
                         total_generated_tokens=20, peak_memory_bytes=2000))
    w2.close()
    lines = audit_path.read_text().strip().split("\n")
    assert len(lines) == 2


def test_writer_no_op_when_path_none():
    w = AuditWriter(None)
    w.write(RunEndEvent(run_id="x", elapsed_s=1.0,
                        total_generated_tokens=0, peak_memory_bytes=0))
    w.close()  # no exception


import pytest
from markovian_rsa_mlx.audit import (
    GenerationStartEvent, ErrorEvent,
)

EVENT_CASES = [
    (RunStartEvent, dict(run_id="r", model_id="m", quantization="q",
                         config=RSAConfig(), prompt="p", created_at="t"), "run_start"),
    (GenerationStartEvent, dict(run_id="r", round=0, trace_id="t", seed=1,
                                 prompt_token_count=2, max_tokens=3,
                                 parent_trace_ids=[]), "generation_start"),
    (TraceCompleteEvent, dict(run_id="r", round=0, trace_id="t",
                              text="x", token_ids=[1], generated_tokens=1,
                              finish_reason="eos", elapsed_s=0.1), "trace_complete"),
    (TailExtractedEvent, dict(run_id="r", round=0, trace_id="t",
                              tail_token_ids=[1], tail_text="x", tail_tokens=1),
     "tail_extracted"),
    (AggregationPromptEvent, dict(run_id="r", round=0, trace_id="t",
                                   selected_tail_trace_ids=[], prompt_text="p",
                                   prompt_token_ids=[1]), "aggregation_prompt"),
    (RoundCompleteEvent, dict(run_id="r", round=0, trace_ids=[],
                              memory_estimate_bytes=0, elapsed_s=0.1), "round_complete"),
    (FinalEvent, dict(run_id="r", final_trace_id="t", final_text="x",
                      all_final_trace_ids=[], answer_selection="first_final_candidate"),
     "final"),
    (RunEndEvent, dict(run_id="r", elapsed_s=0.1, total_generated_tokens=1,
                       peak_memory_bytes=1), "run_end"),
    (ErrorEvent, dict(run_id="r", stage="x", message="m", recoverable=False),
     "error"),
]


@pytest.mark.parametrize("event_cls,kwargs,expected_event_name", EVENT_CASES)
def test_event_round_trip_through_writer(tmp_path, event_cls, kwargs, expected_event_name):
    """All 9 event types serialize through AuditWriter with the right `event` field."""
    audit_path = tmp_path / f"{expected_event_name}.jsonl"
    with AuditWriter(audit_path) as w:
        w.write(event_cls(**kwargs))
    line = audit_path.read_text().strip()
    payload = json.loads(line)
    assert payload["event"] == expected_event_name


def test_with_context_manager_closes_on_exit(tmp_path):
    """Context manager closes the writer on block exit, even on exception."""
    audit_path = tmp_path / "ctx.jsonl"
    w = AuditWriter(audit_path)
    with w:
        w.write(RunEndEvent(run_id="r", elapsed_s=0.0,
                            total_generated_tokens=0, peak_memory_bytes=0))
    # Writer must be closed after exiting the with block
    with pytest.raises(ValueError, match="closed"):
        w.write(RunEndEvent(run_id="r", elapsed_s=0.0,
                            total_generated_tokens=0, peak_memory_bytes=0))
    assert audit_path.read_text().strip().count("\n") == 0  # exactly one event written


def test_write_after_close_raises(tmp_path):
    """Calling write() after close() raises a clear error (not silent no-op)."""
    audit_path = tmp_path / "post_close.jsonl"
    w = AuditWriter(audit_path)
    w.close()
    with pytest.raises(ValueError, match="closed"):
        w.write(RunEndEvent(run_id="r", elapsed_s=0.0,
                            total_generated_tokens=0, peak_memory_bytes=0))


def test_close_is_idempotent(tmp_path):
    """Calling close() twice is fine."""
    audit_path = tmp_path / "double_close.jsonl"
    w = AuditWriter(audit_path)
    w.close()
    w.close()  # no exception