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

import bpy


def action_report(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(curve.select),
                    })
    channels.sort(key=lambda value: (value["path"], value["index"]))
    return {"name": action.name, "channels": channels}


def view_report():
    area = None
    for screen in bpy.data.screens:
        area = next(
            (candidate for candidate in screen.areas
             if candidate.type == "DOPESHEET_EDITOR" and candidate.spaces.active.ui_mode == "ACTION"),
            None,
        )
        if area is not None:
            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)
    return {
        "areaType": area.type,
        "uiMode": area.spaces.active.ui_mode,
        "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-channels-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)
    obj = bpy.data.objects.get("WebGapAnimChannelsViewSelectedObject")
    if obj is None or obj.animation_data is None or obj.animation_data.action is None:
        raise RuntimeError("WebGapAnimChannelsViewSelectedObject Action is missing")
    before = {"action": action_report(obj.animation_data.action), **view_report()}
    expected = [1.0, 3.0, 5.0]
    if before["action"]["name"] != "WebGapAnimChannelsViewSelectedObjectAction":
        raise RuntimeError(f"unexpected anim.channels_view_selected action: {before}")
    if len(before["action"]["channels"]) != 3 or any(channel["frames"] != expected or not channel["selected"] for channel in before["action"]["channels"]):
        raise RuntimeError(f"channels were not selected: {before}")

    descriptor, temporary = tempfile.mkstemp(prefix="m16-anim-channels-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)
        reopened_obj = bpy.data.objects.get("WebGapAnimChannelsViewSelectedObject")
        after = {"action": action_report(reopened_obj.animation_data.action), **view_report()}
    finally:
        pathlib.Path(temporary).unlink(missing_ok=True)
    if before != after:
        raise RuntimeError("anim.channels_view_selected save/reopen drift")
    report = {
        "schemaVersion": 1,
        "task": "M16-GAP-00171",
        "operation": "ANIM_CHANNELS_VIEW_SELECTED_DESKTOP",
        "fixture": str(fixture),
        "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
        "selectedChannels": len(after["action"]["channels"]),
        "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("anim-channels-view-selected-desktop-ok selected=3 view2d=exact saveReopen=exact")


if __name__ == "__main__":
    main()