"""Structured TRACE logging assertions."""

import json
from pathlib import Path

import pytest
from loguru import logger

from free_claude_code.config.logging_config import configure_logging
from free_claude_code.core.trace import (
    TRACE_PAYLOAD_BINDING,
    trace_event,
    traced_async_stream,
)


class _CloseTrackingIterator:
    def __init__(
        self,
        chunks: list[str],
        *,
        iteration_error: Exception | None = None,
        close_error: Exception | None = None,
    ) -> None:
        self._chunks = iter(chunks)
        self._iteration_error = iteration_error
        self._close_error = close_error
        self.close_calls = 0

    def __aiter__(self) -> _CloseTrackingIterator:
        return self

    async def __anext__(self) -> str:
        try:
            return next(self._chunks)
        except StopIteration:
            if self._iteration_error is not None:
                error = self._iteration_error
                self._iteration_error = None
                raise error from None
            raise StopAsyncIteration from None

    async def aclose(self) -> None:
        self.close_calls += 1
        if self._close_error is not None:
            raise self._close_error


def _json_log_rows(log_file: str) -> list[dict]:
    logger.complete()
    text = Path(log_file).read_text(encoding="utf-8").strip()
    if not text:
        return []
    return [json.loads(line) for line in text.split("\n")]


def test_trace_payload_merged_into_json_line(tmp_path) -> None:
    log_file = str(tmp_path / "t.log")
    configure_logging(log_file, force=True, level="DEBUG")
    trace_event(stage="s", event="e.v1", source="unit", hello="world", n=42)
    row = _json_log_rows(log_file)[-1]
    assert row["level"] == "DEBUG"
    assert row["trace"] is True
    assert row["stage"] == "s"
    assert row["event"] == "e.v1"
    assert row["source"] == "unit"
    assert row["hello"] == "world"
    assert row["n"] == 42
    assert TRACE_PAYLOAD_BINDING == "trace_payload"


def test_trace_payload_excluded_from_default_info_logs(tmp_path) -> None:
    log_file = str(tmp_path / "default.log")
    configure_logging(log_file, force=True)

    trace_event(stage="s", event="hidden", source="unit")
    logger.info("visible lifecycle event")

    rows = _json_log_rows(log_file)
    assert [row["message"] for row in rows] == ["visible lifecycle event"]


def test_sanitize_masks_nested_api_key_strings() -> None:
    """Credential-shaped keys redact without touching normal message text."""
    from free_claude_code.core.trace import sanitize_trace_value

    out = sanitize_trace_value(
        {"outer": {"api_key": "secret", "text": "visible"}},
    )
    assert out["outer"]["api_key"] == "<redacted>"
    assert out["outer"]["text"] == "visible"


@pytest.mark.asyncio
async def test_traced_async_stream_logs_completion(tmp_path) -> None:
    log_file = str(tmp_path / "complete.log")
    configure_logging(log_file, force=True, level="DEBUG")

    source = _CloseTrackingIterator(["hello", " world"])

    chunks = [
        chunk
        async for chunk in traced_async_stream(
            source,
            stage="egress",
            source="unit",
            complete_event="stream.completed",
            interrupted_event="stream.interrupted",
            extra={"request_id": "req_complete"},
        )
    ]

    assert chunks == ["hello", " world"]
    assert source.close_calls == 1
    rows = _json_log_rows(log_file)
    completed = [row for row in rows if row.get("event") == "stream.completed"]
    assert len(completed) == 1
    assert completed[0]["request_id"] == "req_complete"
    assert completed[0]["stream_chunks"] == 2
    assert completed[0]["outcome"] == "ok"


@pytest.mark.asyncio
async def test_traced_async_stream_logs_real_exception(tmp_path) -> None:
    log_file = str(tmp_path / "error.log")
    configure_logging(log_file, force=True, level="DEBUG")

    source = _CloseTrackingIterator(
        ["before"],
        iteration_error=RuntimeError("boom"),
        close_error=RuntimeError("close boom"),
    )

    with pytest.raises(RuntimeError, match="boom"):
        async for _chunk in traced_async_stream(
            source,
            stage="egress",
            source="unit",
            complete_event="stream.completed",
            interrupted_event="stream.interrupted",
            extra={"request_id": "req_error"},
        ):
            pass

    assert source.close_calls == 1

    rows = _json_log_rows(log_file)
    interrupted = [row for row in rows if row.get("event") == "stream.interrupted"]
    assert len(interrupted) == 1
    assert interrupted[0]["request_id"] == "req_error"
    assert interrupted[0]["stream_chunks"] == 1
    assert interrupted[0]["outcome"] == "error"
    assert interrupted[0]["exc_type"] == "RuntimeError"
    close_failed = [
        row for row in rows if row.get("event") == "stream.input.close_failed"
    ]
    assert len(close_failed) == 1
    assert close_failed[0]["owner"] == "traced_async_stream"
    assert close_failed[0]["close_exc_type"] == "RuntimeError"
    assert close_failed[0]["preserved_exc_type"] == "RuntimeError"


@pytest.mark.asyncio
async def test_traced_async_stream_closes_quietly_on_generator_exit(tmp_path) -> None:
    log_file = str(tmp_path / "generator_exit.log")
    configure_logging(log_file, force=True, level="DEBUG")

    source = _CloseTrackingIterator(["first", "second"])

    stream = traced_async_stream(
        source,
        stage="egress",
        source="unit",
        complete_event="stream.completed",
        interrupted_event="stream.interrupted",
        extra={"request_id": "req_closed"},
    )

    assert await anext(stream) == "first"
    await stream.aclose()

    assert source.close_calls == 1
    rows = _json_log_rows(log_file)
    events = {row.get("event") for row in rows}
    assert "stream.completed" not in events
    assert "stream.interrupted" not in events