"""Regression tests for the Plotly canvas push contract.

``Plotly.react`` resets any scene attribute the incoming layout omits, so a
data-only push must be flagged ``preserveView`` (the JS side then carries the
live camera and axis ranges forward). Only explicit re-frames may send the
computed framing. These tests capture the JavaScript the canvas emits instead
of driving the browser, so they stay fast and deterministic.
"""

from __future__ import annotations

import json
from pathlib import Path

import pytest

pytest.importorskip("PySide6")
pytest.importorskip("plotly")

from otko.services import load_project

EXAMPLES = Path(__file__).resolve().parents[2] / "examples"


def _canvas_with_captured_js(qtbot):  # type: ignore[no-untyped-def]
    from otko.views.canvas_plotly import PlotlyCanvas

    canvas = PlotlyCanvas()
    qtbot.addWidget(canvas)
    # Pretend the page finished loading, then capture instead of running JS.
    canvas._ready = True
    calls: list[str] = []
    canvas._eval = lambda js: calls.append(js)  # type: ignore[method-assign]
    return canvas, calls


def _parse_call(call: str) -> tuple[dict, bool]:
    """Split a captured ``window.otkoUpdate(<json>, <flag>)`` call."""
    body = call[len("window.otkoUpdate(") : -1]
    literal, _sep, flag = body.rpartition(", ")
    return json.loads(json.loads(literal)), flag == "true"


@pytest.mark.gui
def test_framing_push_is_not_marked_preserve_view(qtbot) -> None:  # type: ignore[no-untyped-def]
    canvas, calls = _canvas_with_captured_js(qtbot)

    canvas.show_project(load_project(EXAMPLES / "cantilever.osmodel"))

    assert calls, "show_project must push a figure"
    payload, preserve = _parse_call(calls[-1])
    assert preserve is False, "initial push must be a re-frame"
    # The framing push carries the camera and the padded ranges.
    scene = payload["layout"]["scene"]
    assert "camera" in scene
    assert "range" in scene["xaxis"]
    assert scene["xaxis"]["autorange"] is False


@pytest.mark.gui
def test_data_update_preserves_the_view(qtbot) -> None:  # type: ignore[no-untyped-def]
    canvas, calls = _canvas_with_captured_js(qtbot)

    canvas.show_project(load_project(EXAMPLES / "cantilever.osmodel"))
    calls.clear()

    canvas.selection.select_node(1)  # data-only update

    assert calls, "selection change must push"
    payload, preserve = _parse_call(calls[-1])
    assert preserve is True, "data update must preserve the view"
    assert "camera" not in payload["layout"]["scene"], "must not re-send the camera"


@pytest.mark.gui
def test_view_presets_and_reset_re_frame(qtbot) -> None:  # type: ignore[no-untyped-def]
    canvas, calls = _canvas_with_captured_js(qtbot)

    canvas.show_project(load_project(EXAMPLES / "cantilever.osmodel"))

    for action in (canvas.view_xy, canvas.view_xz, canvas.view_yz, canvas.reset_camera):
        calls.clear()
        action()
        assert calls[-1].endswith(", false)"), f"{action.__name__} must re-frame"


@pytest.mark.gui
def test_style_change_re_frames_for_layout_only_attrs(qtbot) -> None:  # type: ignore[no-untyped-def]
    from otko.views.canvas3d.style import RenderStyle

    canvas, calls = _canvas_with_captured_js(qtbot)
    canvas.show_project(load_project(EXAMPLES / "cantilever.osmodel"))
    calls.clear()

    canvas.set_style(RenderStyle(show_axis_outline=True))

    assert calls[-1].endswith(", false)"), "background/outline live in the layout"