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

import bpy


OBJECTS = ("WebGapAnimReplaceNewOldA", "WebGapAnimReplaceNewOldB")
OLD_ACTION = "WebGapAnimReplaceNewOldAction"


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("replace_action_new 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_replaced(state):
    names = [value["name"] for value in state["objects"].values()]
    return all(name and name != OLD_ACTION for name in names) and len(set(names)) == 1


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --factory-startup --python check-action-replace-action-new-desktop.py -- FIXTURE REPORT")
    fixture, output = (pathlib.Path(value).resolve() for value in arguments)
    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=False)
    before = state_report()
    preserved = is_replaced(before)
    if not preserved:
        if before["activeObject"] != OBJECTS[0]:
            raise RuntimeError(f"replace_action_new active object is wrong: {before}")
        if any(value["name"] != OLD_ACTION for value in before["objects"].values()):
            raise RuntimeError(f"replace_action_new source actions are wrong: {before}")
    old_action = bpy.data.actions.get(OLD_ACTION)
    if old_action is None:
        raise RuntimeError("replace_action_new old action is missing")
    if preserved:
        poll = True
        result = {"FINISHED"}
    else:
        poll = bool(bpy.ops.anim.replace_action_new.poll())
        if not poll:
            raise RuntimeError("ANIM_OT_replace_action_new poll failed")
        result = bpy.ops.anim.replace_action_new(old_session_uid=old_action.session_uid)
        if result != {"FINISHED"}:
            raise RuntimeError(f"ANIM_OT_replace_action_new returned {result}")
    after = state_report()
    if not is_replaced(after):
        raise RuntimeError(f"replace_action_new did not replace all users: {after}")
    new_action_name = next(iter({value["name"] for value in after["objects"].values()}))

    descriptor, temporary = tempfile.mkstemp(prefix="m16-anim-replace-action-new-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=False)
        reopened = state_report()
        if reopened != after:
            raise RuntimeError(f"anim.replace_action_new 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-00203",
            "operation": "ANIM_REPLACE_ACTION_NEW_DESKTOP",
            "fixture": str(fixture),
            "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
            "before": before,
            "after": reopened,
            "newAction": new_action_name,
            "poll": poll,
            "operatorStatus": "FINISHED",
            "mainMutation": "ACTION_REPLACED_WITH_NEW" if not preserved else "NONE_ALREADY_REPLACED",
            "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-replace-action-new-desktop-ok poll=true status=FINISHED mainMutation=action_replaced_with_new saveReopen=exact")
    finally:
        temporary_path.unlink(missing_ok=True)


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