#!/usr/bin/env python3
import pathlib
import sys

import bpy


OBJECT_NAME = "WebGapAnimViewCurveGraphEditorObject"
ACTION_NAME = "WebGapAnimViewCurveGraphEditorAction"
PROPERTY_NAME = "curve_target"


def configure_graph_editor():
    window = bpy.context.window
    if window is None or window.screen is None:
        raise RuntimeError("fixture requires a Blender window")
    screen = window.screen
    area = next((candidate for candidate in screen.areas if candidate.type in {"DOPESHEET_EDITOR", "VIEW_3D"}), None)
    if area is None:
        raise RuntimeError("default Layout VIEW_3D area is missing")
    area.type = "GRAPH_EDITOR"
    return area


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 1:
        raise SystemExit("usage: blender -b --factory-startup --python M16-GAP-00214.py -- OUTPUT")
    bpy.ops.wm.read_factory_settings(use_empty=True)
    mesh = bpy.data.meshes.new(f"{OBJECT_NAME}Mesh")
    mesh.from_pydata(
        [(-1.0, -1.0, 0.0), (1.0, -1.0, 0.0), (1.0, 1.0, 0.0), (-1.0, 1.0, 0.0)],
        [],
        [(0, 1, 2, 3)],
    )
    obj = bpy.data.objects.new(OBJECT_NAME, mesh)
    bpy.context.scene.collection.objects.link(obj)
    bpy.context.view_layer.objects.active = obj
    obj.select_set(True)
    obj[PROPERTY_NAME] = -3.0
    obj.keyframe_insert(data_path=f'["{PROPERTY_NAME}"]', frame=1)
    obj[PROPERTY_NAME] = 7.0
    obj.keyframe_insert(data_path=f'["{PROPERTY_NAME}"]', frame=10)
    obj.animation_data.action.name = ACTION_NAME
    obj.animation_data.action.use_fake_user = True
    curve = next(curve for curve in obj.animation_data.action.layers[0].strips[0].channelbags[0].fcurves)
    for keyframe in curve.keyframe_points:
        keyframe.select_control_point = False
    curve.keyframe_points[0].select_control_point = True
    curve.keyframe_points[1].select_control_point = False
    bpy.context.scene.frame_start = 1
    bpy.context.scene.frame_end = 10
    bpy.context.scene.frame_set(5)
    bpy.context.preferences.view.smooth_view = 0
    graph_area = configure_graph_editor()
    graph_region = next(candidate for candidate in graph_area.regions if candidate.type == "WINDOW")
    with bpy.context.temp_override(window=bpy.context.window, screen=bpy.context.screen, area=graph_area, region=graph_region):
        if "FINISHED" not in bpy.ops.graph.view_selected():
            raise RuntimeError("Graph Editor view_selected failed while preparing fixture")
    bpy.ops.wm.save_as_mainfile(
        filepath=str(pathlib.Path(arguments[0]).resolve()), check_existing=False, compress=True
    )


if __name__ == "__main__":
    main()