Project-M/Assets/_Project/Scripts/Editor/PlayerRigTools.cs

using UnityEditor;
using UnityEditor.Animations;
using UnityEngine;

namespace ProjectM.EditorTools
{
    /// <summary>
    /// MC-4 — builds the player's procedural MELEE SWING clip and adds the IsAttacking param + MeleeSwing state to
    /// AC_PlayerTopDown. Mirrors EnemyRigTools' attack recipe (a Root-bone procedural clip — no authored Synty
    /// Generic melee-swing clip exists; the slash-arc VFX in CombatFeedbackSystem carries the blade read). The clip
    /// keys ONLY Root rotation (a yaw twist into the swing + a slight forward pitch), leaving the rig's authored
    /// Root Y offset (feet-on-ground) untouched. PlayerAnimationDriveSystem drives IsAttacking from MeleeCombo.
    /// Idempotent / re-runnable (menu: ProjectM/Animation).
    /// </summary>
    public static class PlayerRigTools
    {
        const string SwingClip = "Assets/_Project/Animation/PlayerMeleeSwing.anim";
        const string PlayerController = "Assets/_Project/Animation/AC_PlayerTopDown.controller";

        [MenuItem("ProjectM/Animation/Player - Build Melee Swing")]
        public static void BuildPlayerMeleeSwing()
        {
            // Horizontal-cleave read: yaw the Root (wind back -> swing across -> recover) + a slight forward pitch.
            // Root is the top of the Synty Generic rig; locomotion clips don't key Root, so no conflict and it
            // returns to the authored pose on exit. Rotation-only (no position) so the baked Root Y offset stays.
            var clip = new AnimationClip { frameRate = 30f };
            var yaw = new AnimationCurve(
                new Keyframe(0f, 0f), new Keyframe(0.06f, -22f), new Keyframe(0.16f, 34f), new Keyframe(0.32f, 0f));
            var pitch = new AnimationCurve(
                new Keyframe(0f, 0f), new Keyframe(0.14f, 16f), new Keyframe(0.32f, 0f));
            AnimationUtility.SetEditorCurve(clip, EditorCurveBinding.FloatCurve("Root", typeof(Transform), "localEulerAnglesRaw.y"), yaw);
            AnimationUtility.SetEditorCurve(clip, EditorCurveBinding.FloatCurve("Root", typeof(Transform), "localEulerAnglesRaw.x"), pitch);
            var s = AnimationUtility.GetAnimationClipSettings(clip);
            s.loopTime = false;
            AnimationUtility.SetAnimationClipSettings(clip, s);
            AssetDatabase.DeleteAsset(SwingClip);
            AssetDatabase.CreateAsset(clip, SwingClip);
            AssetDatabase.SaveAssets();

            var ac = AssetDatabase.LoadAssetAtPath<AnimatorController>(PlayerController);
            if (ac == null) { Debug.LogError($"[PlayerRigTools] Controller missing: {PlayerController}"); return; }

            if (!HasParam(ac, "IsAttacking"))
                ac.AddParameter("IsAttacking", AnimatorControllerParameterType.Bool);

            var sm = ac.layers[0].stateMachine;
            var swingClipAsset = AssetDatabase.LoadAssetAtPath<AnimationClip>(SwingClip);

            var swing = FindState(sm, "MeleeSwing");
            if (swing == null)
            {
                swing = sm.AddState("MeleeSwing");
                swing.writeDefaultValues = true;

                var toSwing = sm.AddAnyStateTransition(swing);
                toSwing.hasExitTime = false;
                toSwing.duration = 0.05f;
                toSwing.canTransitionToSelf = false;
                toSwing.AddCondition(AnimatorConditionMode.If, 0f, "IsAttacking");

                var fromSwing = swing.AddExitTransition();
                fromSwing.hasExitTime = false;
                fromSwing.duration = 0.10f;
                fromSwing.AddCondition(AnimatorConditionMode.IfNot, 0f, "IsAttacking");
            }
            swing.motion = swingClipAsset; // (re)point at the freshly-built clip

            EditorUtility.SetDirty(ac);
            AssetDatabase.SaveAssets();
            Debug.Log("[PlayerRigTools] AC_PlayerTopDown: IsAttacking + MeleeSwing state built; PlayerMeleeSwing.anim created.");
        }

        static bool HasParam(AnimatorController ac, string name)
        {
            foreach (var p in ac.parameters) if (p.name == name) return true;
            return false;
        }

        static AnimatorState FindState(AnimatorStateMachine sm, string name)
        {
            foreach (var c in sm.states) if (c.state.name == name) return c.state;
            return null;
        }
    }
}