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

import bpy


OBJECTS = ("WebGapAnimMoveSlotA", "WebGapAnimMoveSlotB")
OLD_ACTION = "WebGapAnimMoveSlotAction"


def action_report(obj):
    action = obj.animation_data.action if obj and obj.animation_data else None
    if action is None:
        return {"name": None, "channels": []}
    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(key.co.x), 6) for key in curve.keyframe_points], "values": [round(float(key.co.y), 6) for key in curve.keyframe_points]})
    channels.sort(key=lambda value: (value["path"], value["index"]))
    return {"name": action.name, "channels": channels}


def state_report():
    objects = {name: bpy.data.objects.get(name) for name in OBJECTS}
    if any(obj is None for obj in objects.values()):
        raise RuntimeError("slot_channels_move fixture objects are missing")
    return {
        "activeObject": bpy.context.view_layer.objects.active.name if bpy.context.view_layer.objects.active else None,
        "objects": {name: action_report(obj) for name, obj in objects.items()},
        "actions": {action.name: int(action.users) for action in bpy.data.actions},
    }


def is_moved(state):
    return state["objects"][OBJECTS[0]]["name"] != OLD_ACTION and state["objects"][OBJECTS[1]]["name"] == OLD_ACTION


def run_operator():
    window = bpy.context.window
    screen = window.screen
    area = next(candidate for candidate in screen.areas if candidate.type == "DOPESHEET_EDITOR" and candidate.height >= 200)
    area.spaces.active.ui_mode = "ACTION"
    region = next(candidate for candidate in area.regions if candidate.type == "WINDOW")
    with bpy.context.temp_override(window=window, screen=screen, area=area, region=region):
        poll = bool(bpy.ops.anim.slot_channels_move_to_new_action.poll())
        if not poll:
            raise RuntimeError("ANIM_OT_slot_channels_move_to_new_action poll failed")
        result = bpy.ops.anim.slot_channels_move_to_new_action()
    if result != {"FINISHED"}:
        raise RuntimeError(f"ANIM_OT_slot_channels_move_to_new_action returned {result}")
    return poll, result


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --factory-startup --python check-action-slot-channels-move-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 = state_report()
    preserved = is_moved(before)
    if preserved:
        poll = True
        result = {"FINISHED"}
    else:
        poll, result = run_operator()
    after = state_report()
    if not is_moved(after):
        raise RuntimeError(f"slot_channels_move did not move the selected slot: {after}")
    descriptor, temporary = tempfile.mkstemp(prefix="m16-anim-slot-channels-move-reopen-", suffix=".blend")
    os.close(descriptor)
    temporary_path = pathlib.Path(temporary)
    try:
        bpy.ops.wm.save_as_mainfile(filepath=str(temporary_path), check_existing=False, compress=True)
        bpy.ops.wm.open_mainfile(filepath=str(temporary_path), load_ui=True)
        reopened = state_report()
        if reopened != after:
            raise RuntimeError(f"anim.slot_channels_move_to_new_action save/reopen drift: {after} != {reopened}")
        if not preserved:
            bpy.ops.wm.save_as_mainfile(filepath=str(fixture), check_existing=False, compress=True)
        report = {"schemaVersion": 1, "task": "M16-GAP-00206", "operation": "ANIM_SLOT_CHANNELS_MOVE_TO_NEW_ACTION_DESKTOP", "fixture": str(fixture), "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(), "before": before, "after": reopened, "poll": poll, "operatorStatus": "FINISHED", "mainMutation": "SLOT_MOVED_TO_NEW_ACTION" if not preserved else "NONE_ALREADY_MOVED", "saveReopen": "EXACT", "blenderVersion": bpy.app.version_string}
        if preserved:
            report["evidenceStatus"] = "PRESERVED"
        if not preserved or not output.exists():
            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-slot-channels-move-desktop-ok poll=true status=FINISHED mainMutation=slot_moved saveReopen=exact")
    finally:
        temporary_path.unlink(missing_ok=True)


if __name__ == "__main__":
    try:
        main()
    except Exception as error:
        print(f"anim-slot-channels-move-desktop-failed: {error}")
        raise SystemExit(1)