using System;
using System.IO;
using System.Linq;
using SimpleJSON;
using UnityEngine;
using UnityEngine.UI;

// VaM namespaces
using MVRScript;

public class LinkExtractor : MVRScript
{
    private JSONStorableString _resultJSON;
    private UIDynamicButton _scanButton;
    private UIDynamicTextField _outputField;

    public override void Init()
    {
        try
        {
            // UI: Button and Text Field
            _scanButton = CreateButton("Scan for Hub Link");
            _scanButton.button.onClick.AddListener(() => ExtractHubLink());

            _outputField = CreateTextField(new JSONStorableString("Output", ""));
            _outputField.height = 200f;
        }
        catch (Exception e)
        {
            SuperController.LogError($"Init Error: {e}");
        }
    }

    private void ExtractHubLink()
    {
        string resultMessage = "Link not found";
        // 1. Get the current atom (character/prop)
        var atom = containingAtom;
        if (atom == null) return;

        // 2. Get the package UID (the .var file identifier)
        string packageUid = atom.GetStorableIDs()
            .Select(id => atom.GetStorableByID(id))
            .FirstOrDefault(s => s != null && !string.IsNullOrEmpty(s.containingPackage?.uid))?.containingPackage?.uid;

        if (string.IsNullOrEmpty(packageUid))
        {
            _outputField.text = "Could not determine package UID.";
            return;
        }

        // 3. Locate the meta.json file inside the package
        // Package paths: Saves/Packages/ or AddonPackages/
        string[] searchPaths = { "Saves/Packages", "AddonPackages" };
        string metaPath = null;

        foreach (var basePath in searchPaths)
        {
            var potentialPath = Path.Combine(SuperController.savesPath, "..", basePath, packageUid);
            var metaFilePath = Path.Combine(potentialPath, "meta.json");
            if (File.Exists(metaFilePath))
            {
                metaPath = metaFilePath;
                break;
            }
        }

        // 4. Parse JSON and look for "promotionalLink" or "link" field
        if (metaPath != null && File.Exists(metaPath))
        {
            try
            {
                var jsonText = File.ReadAllText(metaPath);
                var jsonNode = JSON.Parse(jsonText);
                // Hub link is typically stored here:
                if (jsonNode["promotionalLink"] != null)
                    resultMessage = jsonNode["promotionalLink"].Value;
                else if (jsonNode["link"] != null)
                    resultMessage = jsonNode["link"].Value;
                
                if (resultMessage == "Link not found") 
                    resultMessage = "promotionalLink field missing.";
            }
            catch (Exception e)
            {
                resultMessage = $"Parse error: {e.Message}";
            }
        }
        else
        {
            resultMessage = "meta.json not found in package.";
        }

        // Display result
        _outputField.text = resultMessage;
        SuperController.LogMessage($"Result: {resultMessage}");
    }
}