/*
 * MIT License
 * 
 * Copyright (c) 2022 bd_
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

using nadena.dev.modular_avatar.editor.ErrorReporting;
using UnityEngine;

namespace nadena.dev.modular_avatar.core.editor
{
    internal class ProbeAnchorProcessor
    {
        internal enum ValidationResult
        {
            OK,
            NotInAvatar
        }

        internal void OnPreprocessAvatar(GameObject avatarGameObject)
        {
            var boneProxies = avatarGameObject.GetComponentsInChildren<ModularAvatarProbeAnchor>(true);

            foreach (var proxy in boneProxies)
            {
                BuildReport.ReportingObject(proxy, () => ProcessAnchor(avatarGameObject, proxy));
            }
        }

        private void ProcessAnchor(GameObject avatarGameObject, ModularAvatarProbeAnchor proxy)
        {
            if (proxy.probeTarget.Get(proxy) != null && ValidateTarget(avatarGameObject, proxy.probeTarget.Get(proxy).transform) == ValidationResult.OK)
            {
                foreach (Renderer r in proxy.GetComponentsInChildren<Renderer>(true))
                {
                    r.probeAnchor = proxy.probeTarget.Get(proxy).transform;
                }
            }

            Object.DestroyImmediate(proxy);
        }

        internal static ValidationResult ValidateTarget(GameObject avatarGameObject, Transform proxyTarget)
        {
            var avatar = avatarGameObject.transform;
            var node = proxyTarget;

            while (node != null && node != avatar)
            {
                node = node.parent;
            }

            if (node == null) return ValidationResult.NotInAvatar;
            else return ValidationResult.OK;
        }
    }
}