"""Drift-detection between TUI presentation discipline and web JS
presenter per issue #16 INV-008.

The JSON fixture at `tests/fixtures/presentation_contract.json`
enumerates the expected browser-facing event payload for each Event
type. Server-side serialization (`_event_to_browser_payload`) is
unit-tested against the fixture. JS-side rendering in
`src/ratatoskr/web/static/index.html` consumes the same shape — if
this fixture changes, both sides update in lockstep.

Post worldtree-sdk cutover (#20): the presenter consumes SDK `TurnEvent`s.
`_event_to_browser_payload` derives the browser payload from the SDK's `raw`
(the wire body) plus the composite `sse_id` string — the SAME shape the old
dataclasses produced, so the fixture is unchanged. These events are built via
the SDK's own `build_event` from the wire body.
"""

from __future__ import annotations

import json
from pathlib import Path

from worldtree_sdk.events import build_event

from ratatoskr.web.server import _event_to_browser_payload


def _load_fixture() -> dict:
    path = Path(__file__).parent / "fixtures" / "presentation_contract.json"
    return json.loads(path.read_text())


def _ev(ev_type: str, sse_id: str, **fields: object) -> object:
    """Build an SDK TurnEvent from its wire body (raw includes `type`); turn_id is
    the turn component of the composite sse_id."""
    turn = int(sse_id.split(":", 1)[0])
    return build_event(ev_type, sse_id, turn, {"type": ev_type, **fields})


def _check(name: str, event: object) -> None:
    """Assert (event_type, data) for `event` matches the fixture entry."""
    fixture = _load_fixture()
    assert name in fixture, f"fixture missing entry for {name!r}"
    expected = fixture[name]
    event_type, data = _event_to_browser_payload(event)
    assert event_type == expected["event_type"], (
        f"{name}: event_type {event_type!r} != fixture {expected['event_type']!r}"
    )
    assert data == expected["data"], (
        f"{name}: data mismatch\n  got: {data}\n  fixture: {expected['data']}"
    )


def test_worker_phase_matches_fixture() -> None:
    _check("worker_phase", _ev("worker_phase", "42:3", phase="BuildingPrompt", turn_id=42))


def test_thinking_matches_fixture() -> None:
    _check("thinking", _ev("thinking", "42:5", content="Let me think..."))


def test_text_matches_fixture() -> None:
    _check("text", _ev("text", "42:7", content="Hello there"))


def test_text_boundary_matches_fixture() -> None:
    _check(
        "text_boundary",
        _ev("text_boundary", "42:8", kind="sentence", char_offset=11, ts="2026-05-28T00:00:00Z"),
    )


def test_tool_start_matches_fixture() -> None:
    _check("tool_start", _ev("tool_start", "42:9", name="search", arguments={"q": "ratatoskr"}))


def test_tool_result_matches_fixture() -> None:
    _check(
        "tool_result",
        _ev("tool_result", "42:10", name="search", result={"n": 1}, duration_ms=12),
    )


def test_done_matches_fixture() -> None:
    _check(
        "done",
        _ev(
            "done", "42:11", phase="succeeded", response="Hello there",
            model="qwen3.6-35-a3b", duration_ms=1234,
            usage={
                "prompt_tokens": 100, "completion_tokens": 50,
                "total_tokens": 150, "cached_input_tokens": 0,
            },
        ),
    )


def test_error_matches_fixture() -> None:
    _check(
        "error",
        _ev(
            "error", "42:11", phase="failed",
            message="llm output invalid", error_code="llm_output_invalid",
        ),
    )


def test_cancelled_matches_fixture() -> None:
    _check(
        "cancelled",
        _ev(
            "cancelled", "42:11", phase="cancelled", turn_id=42,
            reason="user_cancel", partial_message_id=None,
        ),
    )


def test_affect_update_matches_fixture() -> None:
    _check(
        "affect_update",
        _ev(
            "affect_update", "42:1", status="current", turn_id=42,
            snapshot={
                "agent_id": "mimir",
                "pad": {"pleasure": 0.52, "arousal": 0.47, "dominance": 0.50},
                "dominant_emotion": "curiosity",
                "emotions_active": [
                    {"type": "curiosity", "intensity": 0.6, "decay_remaining_s": 202.7}
                ],
                "baseline_pad": {"pleasure": 0.50, "arousal": 0.40, "dominance": 0.50},
                "mood_drift": {"valence_delta": 0.02, "arousal_delta": 0.07},
                "last_updated_at": "2026-05-28T00:00:00+00:00",
            },
        ),
    )


def test_awaiting_llm_first_token_matches_fixture() -> None:
    _check(
        "awaiting_llm_first_token",
        _ev(
            "awaiting_llm_first_token", "42:2",
            turn_id=42, elapsed_ms_since_building_prompt=5012.3,
        ),
    )