using UnityEngine;
using UnityEditor;
using System.IO;

/// <summary>
/// Pulls project files (scripts, sprites, anything listed) from the AFX
/// server into this project. The server publishes manifest.txt with one
/// "relative/path size" line per file, relative to the project root.
/// Menu: AFX > Sync from Server. Scripts that change trigger a recompile.
/// </summary>
public static class AFXSync
{
    public const string Base = "http://78.110.173.123/afx/";

    [MenuItem("AFX/Sync from Server")]
    public static void Sync()
    {
        PlayerSettings.insecureHttpOption = InsecureHttpOption.AlwaysAllowed;
        string manifest = FetchText(Base + "manifest.txt");
        if (manifest == null) { Debug.LogError("AFX sync: could not fetch " + Base + "manifest.txt"); return; }
        int got = 0, skipped = 0;
        foreach (var raw in manifest.Split('\n'))
        {
            var line = raw.Trim();
            if (line.Length == 0 || line.StartsWith("#")) continue;
            int sp = line.LastIndexOf(' ');
            string rel = sp > 0 ? line.Substring(0, sp) : line;
            long size = sp > 0 && long.TryParse(line.Substring(sp + 1), out var sz) ? sz : -1;
            if (rel.Contains("..") || rel.StartsWith("/")) continue;   // keep writes inside the project
            if (File.Exists(rel) && size >= 0 && new FileInfo(rel).Length == size) { skipped++; continue; }
            var bytes = FetchBytes(Base + rel);
            if (bytes == null) { Debug.LogWarning("AFX sync: failed " + rel); continue; }
            var dir = Path.GetDirectoryName(rel);
            if (!string.IsNullOrEmpty(dir)) Directory.CreateDirectory(dir);   // root files (CLAUDE.md) have no folder
            File.WriteAllBytes(rel, bytes);
            if (rel.EndsWith(".png"))
            {
                // generated maps depend on the sprite's alpha; drop them so they rebuild
                string stem = rel.Substring(0, rel.Length - 4);
                AssetDatabase.DeleteAsset(stem + "_n.png");
                AssetDatabase.DeleteAsset(stem + "_ao.png");
            }
            got++;
            Debug.Log("AFX sync: " + rel + " (" + bytes.Length + " bytes)");
        }
        AssetDatabase.Refresh(ImportAssetOptions.ForceUpdate);
        if (got > 0) EditorUtility.RequestScriptReload();   // Unity sometimes misses scripts written from outside; make sure new code actually compiles
        Debug.Log("AFX sync done: " + got + " updated, " + skipped + " unchanged.");
    }

    public static string FetchText(string url)
    {
        var b = FetchBytes(url);
        return b == null ? null : System.Text.Encoding.UTF8.GetString(b);
    }

    public static byte[] FetchBytes(string url)
    {
        using (var req = UnityEngine.Networking.UnityWebRequest.Get(url))
        {
            req.timeout = 30;
            var op = req.SendWebRequest();
            while (!op.isDone) System.Threading.Thread.Sleep(10);
            if (req.result != UnityEngine.Networking.UnityWebRequest.Result.Success) { Debug.LogWarning("AFX sync: " + url + " -> " + req.error); return null; }
            return req.downloadHandler.data;
        }
    }
}