#!/usr/bin/env python3
import hashlib
import json
import os
import pathlib
import sys
import tempfile

import bpy


def action_channels(action):
    channels = []
    for layer in action.layers:
        for strip in layer.strips:
            for bag in strip.channelbags:
                for curve in bag.fcurves:
                    channels.append({
                        "path": curve.data_path,
                        "index": curve.array_index,
                        "frames": [round(float(keyframe.co.x), 6) for keyframe in curve.keyframe_points],
                        "selected": [bool(keyframe.select_control_point) for keyframe in curve.keyframe_points],
                    })
    channels.sort(key=lambda value: (value["path"], value["index"]))
    return channels


def action_view_report():
    screen = None
    area = None
    for candidate_screen in bpy.data.screens:
        candidate_area = next(
            (candidate for candidate in candidate_screen.areas
             if candidate.type == "DOPESHEET_EDITOR" and candidate.spaces.active.ui_mode == "ACTION"),
            None,
        )
        if candidate_area is not None:
            screen, area = candidate_screen, candidate_area
            break
    if area is None:
        raise RuntimeError("Action Editor area is missing")
    region = next((candidate for candidate in area.regions if candidate.type == "WINDOW"), None)
    if region is None:
        raise RuntimeError("Action Editor window region is missing")
    view = region.view2d
    xmin, ymin = view.region_to_view(0, 0)
    xmax, ymax = view.region_to_view(region.width - 1, region.height - 1)
    obj = bpy.data.objects.get("WebGapActionViewSelectedObject")
    if obj is None or obj.animation_data is None or obj.animation_data.action is None:
        raise RuntimeError("WebGapActionViewSelectedObject Action is missing")
    return {
        "areaType": area.type,
        "uiMode": area.spaces.active.ui_mode,
        "action": {
            "name": obj.animation_data.action.name,
            "channels": action_channels(obj.animation_data.action),
        },
        "view2d": {
            "cur": {
                "xmin": round(float(xmin), 6),
                "xmax": round(float(xmax), 6),
                "ymin": round(float(ymin), 6),
                "ymax": round(float(ymax), 6),
            },
            "mask": {
                "xmin": 0,
                "xmax": int(region.width - 1),
                "ymin": 0,
                "ymax": int(region.height - 1),
            },
        },
    }


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --python check-action-view-selected-desktop.py -- FIXTURE REPORT")
    fixture, output = (pathlib.Path(value).resolve() for value in arguments)
    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=True)
    before = action_view_report()
    expected = [[False, True, False]] * 3
    if before["action"]["name"] != "WebGapActionViewSelectedObjectAction" or [channel["selected"] for channel in before["action"]["channels"]] != expected:
        raise RuntimeError(f"unexpected action.view_selected result: {before}")
    descriptor, temporary = tempfile.mkstemp(prefix="m16-action-view-selected-reopen-", suffix=".blend")
    os.close(descriptor)
    try:
        bpy.ops.wm.save_as_mainfile(filepath=temporary, check_existing=False, compress=True)
        bpy.ops.wm.open_mainfile(filepath=temporary, load_ui=True)
        after = action_view_report()
    finally:
        pathlib.Path(temporary).unlink(missing_ok=True)
    if before != after:
        raise RuntimeError(f"action.view_selected save/reopen drift: {before} != {after}")
    report = {
        "schemaVersion": 1,
        "task": "M16-GAP-00149",
        "operation": "ACTION_VIEW_SELECTED_DESKTOP",
        "fixture": str(fixture),
        "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
        "selectedFrame": 3,
        "action": after["action"],
        "view2d": after["view2d"],
        "saveReopen": "EXACT",
        "blenderVersion": bpy.app.version_string,
    }
    output.parent.mkdir(parents=True, exist_ok=True)
    output.write_text(json.dumps(report, indent=2, sort_keys=True) + "\n", encoding="utf-8")
    print("action-view-selected-desktop-ok channels=3 selectedFrame=3 view2d=exact saveReopen=exact")


if __name__ == "__main__":
    main()