using UnityEngine;
using UnityEditor;
using System.IO;

/// <summary>
/// OGG → Setup → Create Gun Splat Weapon
/// Builds:
///   • Assets/Prefabs/Weapons/GunSplat.prefab       — the held weapon (SimpleGun)
///   • Assets/Prefabs/Pickups/GunSplat_Pickup.prefab — world pickup (spins/bobs, press E)
///   • Assets/Items/GunSplat_Item.asset              — ItemDefinition (type = Weapon)
/// </summary>
public static class GunSplatSetup
{
    private const string GLB_PATH       = "Assets/Models/LidarScans/Gun Splat.glb";
    private const string WEAPON_PREFAB  = "Assets/Prefabs/Weapons/GunSplat.prefab";
    private const string PICKUP_PREFAB  = "Assets/Prefabs/Pickups/GunSplat_Pickup.prefab";
    private const string ITEM_DEF_PATH  = "Assets/Items/GunSplat_Item.asset";

    [MenuItem("OGG/Setup/Create Gun Splat Weapon")]
    public static void CreateGunSplat()
    {
        // ── 1. Ensure output folders exist ──────────────────────────
        EnsureFolder("Assets/Prefabs/Weapons");
        EnsureFolder("Assets/Prefabs/Pickups");
        EnsureFolder("Assets/Items");

        // ── 2. Load the GLB model ────────────────────────────────────
        GameObject modelAsset = AssetDatabase.LoadAssetAtPath<GameObject>(GLB_PATH);
        if (modelAsset == null)
        {
            Debug.LogError($"[GunSplatSetup] Could not find GLB at: {GLB_PATH}");
            EditorUtility.DisplayDialog("Gun Splat Setup", $"Could not find model at:\n{GLB_PATH}", "OK");
            return;
        }

        // ── 3. Build the held-weapon prefab ──────────────────────────
        GameObject weaponRoot = new GameObject("GunSplat");
        AttachVisual(weaponRoot, modelAsset);

        SimpleGun gun   = weaponRoot.AddComponent<SimpleGun>();
        gun.damage      = 30f;
        gun.range       = 120f;
        gun.fireRate    = 6f;
        gun.maxAmmo     = 24;
        gun.isAutomatic = false;

        if (File.Exists(DataRelative(WEAPON_PREFAB)))
            AssetDatabase.DeleteAsset(WEAPON_PREFAB);

        GameObject savedWeapon = PrefabUtility.SaveAsPrefabAsset(weaponRoot, WEAPON_PREFAB);
        Object.DestroyImmediate(weaponRoot);

        if (savedWeapon == null)
        {
            Debug.LogError("[GunSplatSetup] Failed to save weapon prefab.");
            return;
        }
        Debug.Log($"[GunSplatSetup] Weapon prefab → {WEAPON_PREFAB}");

        // ── 4. Create / update ItemDefinition ────────────────────────
        ItemDefinition item = AssetDatabase.LoadAssetAtPath<ItemDefinition>(ITEM_DEF_PATH);
        bool isNew = item == null;
        if (isNew) item = ScriptableObject.CreateInstance<ItemDefinition>();

        item.itemName     = "Gun Splat";
        item.type         = ItemDefinition.ItemType.Weapon;
        item.weaponPrefab = savedWeapon;
        item.description  = "A janky lidar-scanned sidearm. Shoots first, looks weird always.";

        if (isNew)
            AssetDatabase.CreateAsset(item, ITEM_DEF_PATH);
        else
            EditorUtility.SetDirty(item);

        AssetDatabase.SaveAssets();
        Debug.Log($"[GunSplatSetup] ItemDefinition → {ITEM_DEF_PATH}");

        // ── 5. Build the world pickup prefab ─────────────────────────
        GameObject pickupRoot = new GameObject("GunSplat_Pickup");

        // Visual child — the GLB model
        AttachVisual(pickupRoot, modelAsset);

        // PickupItem component
        PickupItem pickup        = pickupRoot.AddComponent<PickupItem>();
        pickup.definition        = item;
        pickup.spinSpeed         = 90f;
        pickup.bobHeight         = 0.15f;
        pickup.bobSpeed          = 2.0f;
        pickup.pickupRadius      = 2.2f;
        pickup.pickupKey         = KeyCode.E;

        if (File.Exists(DataRelative(PICKUP_PREFAB)))
            AssetDatabase.DeleteAsset(PICKUP_PREFAB);

        GameObject savedPickup = PrefabUtility.SaveAsPrefabAsset(pickupRoot, PICKUP_PREFAB);
        Object.DestroyImmediate(pickupRoot);

        if (savedPickup == null)
        {
            Debug.LogError("[GunSplatSetup] Failed to save pickup prefab.");
            return;
        }
        Debug.Log($"[GunSplatSetup] Pickup prefab → {PICKUP_PREFAB}");

        AssetDatabase.Refresh();

        // ── 6. Done ──────────────────────────────────────────────────
        EditorUtility.DisplayDialog(
            "Gun Splat Setup ✓",
            "Created:\n" +
            $"• {WEAPON_PREFAB}\n" +
            $"• {PICKUP_PREFAB}\n" +
            $"• {ITEM_DEF_PATH}\n\n" +
            "Drag GunSplat_Pickup into the scene wherever you want it to spawn.\n" +
            "It will spin, bob, and show an [E] prompt when the player gets close.",
            "Sick");

        EditorGUIUtility.PingObject(savedPickup);
        Selection.activeObject = savedPickup;
    }

    // ─── Helpers ─────────────────────────────────────────────────────

    static void AttachVisual(GameObject parent, GameObject modelAsset)
    {
        GameObject visual = (GameObject)PrefabUtility.InstantiatePrefab(modelAsset);
        if (visual == null) visual = Object.Instantiate(modelAsset);
        visual.name = "Visual";
        visual.transform.SetParent(parent.transform, false);
        visual.transform.localPosition = Vector3.zero;
        visual.transform.localRotation = Quaternion.identity;
        visual.transform.localScale    = Vector3.one;
    }

    static string DataRelative(string assetPath) =>
        Application.dataPath + "/../" + assetPath;

    static void EnsureFolder(string path)
    {
        string[] parts   = path.Split('/');
        string   current = parts[0];
        for (int i = 1; i < parts.Length; i++)
        {
            string next = current + "/" + parts[i];
            if (!AssetDatabase.IsValidFolder(next))
                AssetDatabase.CreateFolder(current, parts[i]);
            current = next;
        }
    }
}