using System.Collections.Generic;
using Newtonsoft.Json.Linq;
using UnityEngine;

public static class GoogleSheetFetchHelper
{
    public static List<GoogleSheetDiff> CompareJsonDiff(string oldJson, string newJson)
    {
        var result = new List<GoogleSheetDiff>();

        if (string.IsNullOrEmpty(oldJson) || string.IsNullOrEmpty(newJson))
            return result;

        var oldObj = JObject.Parse(oldJson);
        var newObj = JObject.Parse(newJson);

        foreach (var sheet in newObj)
        {
            if (!oldObj.TryGetValue(sheet.Key, out var oldSheetData))
                continue;

            var newSheetData = (JArray)sheet.Value;
            var oldSheetArray = (JArray)oldSheetData;

            int minCount = Mathf.Min(oldSheetArray.Count, newSheetData.Count);

            for (int i = 1; i < minCount; i++)
            {
                var oldRow = (JObject)oldSheetArray[i];
                var newRow = (JObject)newSheetData[i];

                foreach (var prop in newRow.Properties())
                {
                    string oldVal = oldRow.TryGetValue(prop.Name, out var val) ? val.ToString() : "";
                    string newVal = prop.Value.ToString();

                    if (oldVal != newVal)
                    {
                        result.Add(new GoogleSheetDiff
                        {
                            Sheet = sheet.Key,
                            Field = prop.Name,
                            RowIndex = i + 1,
                            OldValue = oldVal,
                            NewValue = newVal
                        });
                    }
                }
            }
        }
        return result;
    }
}