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

import bpy


ARMATURE_NAME = "WebGapArmatureCollectionDeselectArmature"
OBJECT_NAME = "WebGapArmatureCollectionDeselectObject"
ACTIVE_COLLECTION = "WebGapArmatureCollectionDeselectActive"
OTHER_COLLECTION = "WebGapArmatureCollectionDeselectOther"
ACTIVE_BONE = "WebGapArmatureCollectionDeselectActiveBone"
OTHER_BONE = "WebGapArmatureCollectionDeselectOtherBone"


def state_report():
    armature = bpy.data.armatures.get(ARMATURE_NAME)
    obj = bpy.data.objects.get(OBJECT_NAME)
    if armature is None or obj is None or obj.type != "ARMATURE" or obj.data != armature:
        raise RuntimeError("armature.collection_deselect fixture is missing")
    was_edit_mode = obj.mode == "EDIT"
    if not was_edit_mode:
        bpy.context.view_layer.objects.active = obj
        obj.select_set(True)
        bpy.ops.object.mode_set(mode="EDIT")
    bones = []
    for bone in armature.edit_bones:
        bones.append({"name": bone.name, "selected": bool(bone.select)})
    if not was_edit_mode:
        bpy.ops.object.mode_set(mode="OBJECT")
    return {
        "object": OBJECT_NAME,
        "armature": ARMATURE_NAME,
        "activeIndex": armature.collections.active_index,
        "bones": bones,
    }


def select_fixture_bones():
    bpy.context.view_layer.objects.active = bpy.data.objects[OBJECT_NAME]
    bpy.data.objects[OBJECT_NAME].select_set(True)
    if bpy.context.object.mode != "EDIT":
        bpy.ops.object.mode_set(mode="EDIT")
    armature = bpy.data.armatures[ARMATURE_NAME]
    bpy.ops.armature.select_all(action="DESELECT")
    for name in (ACTIVE_BONE, OTHER_BONE):
        bone = armature.edit_bones[name]
        bone.select = True
        bone.select_head = True
        bone.select_tail = True
    armature.bones.active = armature.bones[ACTIVE_BONE]


def run_operator(already_deselected):
    if already_deselected:
        obj = bpy.data.objects[OBJECT_NAME]
        bpy.context.view_layer.objects.active = obj
        obj.select_set(True)
        if bpy.context.object.mode != "EDIT":
            bpy.ops.object.mode_set(mode="EDIT")
        armature = bpy.data.armatures[ARMATURE_NAME]
        bpy.ops.armature.select_all(action="DESELECT")
        other_bone = armature.edit_bones[OTHER_BONE]
        other_bone.select = True
        other_bone.select_head = True
        other_bone.select_tail = True
    else:
        select_fixture_bones()
    armature = bpy.data.armatures[ARMATURE_NAME]
    poll = bool(bpy.ops.armature.collection_deselect.poll())
    if not poll:
        raise RuntimeError("ARMATURE_OT_collection_deselect poll failed")
    if not already_deselected:
        result = bpy.ops.armature.collection_deselect()
        if result != {"FINISHED"}:
            raise RuntimeError(f"ARMATURE_OT_collection_deselect returned {result}")
    bpy.ops.object.mode_set(mode="OBJECT")
    return poll, not already_deselected


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --factory-startup --python check-action-armature-collection-deselect-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()
    if before["activeIndex"] != 0:
        raise RuntimeError(f"unexpected active collection: {before}")
    already_deselected = all(
        not bone["selected"] for bone in before["bones"] if bone["name"] == ACTIVE_BONE
    )
    poll, changed = run_operator(already_deselected)
    after = state_report()
    selected = {bone["name"]: bone["selected"] for bone in after["bones"]}
    if selected.get(ACTIVE_BONE) is not False or selected.get(OTHER_BONE) is not True:
        raise RuntimeError(f"collection_deselect produced unexpected selection: {after}")

    descriptor, temporary = tempfile.mkstemp(prefix="m16-armature-collection-deselect-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"armature.collection_deselect save/reopen drift: {after} != {reopened}")
        shutil.copyfile(temporary_path, fixture)
        report = {
            "schemaVersion": 1,
            "task": "M16-GAP-00224",
            "operation": "ARMATURE_COLLECTION_DESELECT_DESKTOP",
            "fixture": str(fixture),
            "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
            "before": before,
            "after": reopened,
            "alreadyDeselected": already_deselected,
            "poll": poll,
            "operatorStatus": "FINISHED" if changed else "SKIPPED_ALREADY_APPLIED",
            "mainMutation": "ACTIVE_COLLECTION_BONES_DESELECTED" if changed else "ACTIVE_COLLECTION_BONES_ALREADY_DESELECTED",
            "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("armature-collection-deselect-desktop-ok poll=true activeCollection=deselected saveReopen=exact")
    finally:
        temporary_path.unlink(missing_ok=True)


if __name__ == "__main__":
    try:
        main()
    except Exception as error:
        print(f"armature-collection-deselect-desktop-failed: {error}")
        raise SystemExit(1)