using System;
using System.Data;
using System.Globalization;
using System.Linq;
using System.Text.Json;

namespace Erp.Platform.Queries;

public class QueryHelper
{
    /// <summary> gelen parametrelere gore [Value] yada 'Value' seklinde sonuc dondurur
    /// </summary>
    /// <param name="fieldDbSource"></param>
    /// <param name="value"></param>
    /// <returns></returns>
    public static object GetFormattedValue(DbType fieldDbSource, object value)
    {
        object[] values = null;
        var isArray = false;

        if (value is JsonElement valueJson && valueJson.ValueKind == JsonValueKind.Array)
        {
            values = valueJson.EnumerateArray().Select(a => (object)a).ToArray();
            isArray = true;
        }
        else if (value is object[] valueArray)
        {
            values = [.. valueArray];
            isArray = true;
        }
        else
        {
            values = [value];
        }

        switch (fieldDbSource)
        {
            case DbType.Guid:
                var guidValues = values.Select(a =>
                {
                    if (a == null)
                        return (Guid?)null;

                    var str = a.ToString();
                    if (string.IsNullOrWhiteSpace(str))
                        return (Guid?)null;

                    return Guid.TryParse(str, out var g) ? g : (Guid?)null;
                }).ToArray();
                value = isArray ? guidValues : guidValues[0];
                break;
            case DbType.String:
            case DbType.AnsiString:
                var strValues = values.Select(a => a?.ToString()).ToArray();
                value = string.Join(PlatformConsts.MultiValueDelimiter, strValues);
                break;
            case DbType.Date:
            case DbType.DateTime:
            case DbType.DateTime2:
            case DbType.DateTimeOffset:
                var dateTimeValues = values.Select(a =>
                {
                    if (a == null) return (DateTimeOffset?)null;

                    var s = a as string ?? a.ToString();
                    if (string.IsNullOrWhiteSpace(s)) return (DateTimeOffset?)null;

                    // 🔹 Kabul edilen olası tarih formatları (tüm dillerde yaygın)
                    var possibleFormats = new[]
                    {
                        "yyyy-MM-dd",
                        "dd.MM.yyyy",
                        "dd/MM/yyyy",
                        "MM/dd/yyyy",
                        "yyyy/MM/dd",
                        "yyyy-MM-ddTHH:mm:ss",
                        "yyyy-MM-ddTHH:mm:ss.fff",
                        "yyyy-MM-ddTHH:mm:ssZ",
                        "yyyy-MM-dd HH:mm:ss",
                        "dd.MM.yyyy HH:mm:ss",
                        "dd/MM/yyyy HH:mm:ss",
                        "MM/dd/yyyy HH:mm:ss"
                    };

                    // 🔹 1. Önce ISO / Invariant formatları dene
                    if (DateTimeOffset.TryParseExact(s, possibleFormats,
                        CultureInfo.InvariantCulture,
                        DateTimeStyles.AssumeUniversal | DateTimeStyles.AdjustToUniversal,
                        out var dto))
                    {
                        return dto.ToUniversalTime();
                    }

                    // 🔹 2. Eğer olmadıysa kültür bağımlı genel parse denemesi
                    if (DateTimeOffset.TryParse(s, CultureInfo.CurrentCulture, DateTimeStyles.AssumeLocal, out dto))
                    {
                        return dto.ToUniversalTime();
                    }

                    // 🔹 3. Son çare: system culture veya ISO fallback
                    if (DateTimeOffset.TryParse(s, CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal, out dto))
                    {
                        return dto.ToUniversalTime();
                    }

                    // 🔹 Parse edilemezse null
                    return (DateTimeOffset?)null;
                }).ToArray();

                value = isArray ? dateTimeValues : dateTimeValues[0];
                break;
            case DbType.Int16:
            case DbType.Int32:
            case DbType.Int64:
            case DbType.VarNumeric:
            case DbType.Decimal:
            case DbType.Double:
            case DbType.Single:
            case DbType.UInt16:
            case DbType.UInt32:
            case DbType.UInt64:
                var numericValues = values.Select(a =>
                {
                    if (a == null)
                        return (double?)null;

                    var s = a.ToString();
                    if (string.IsNullOrWhiteSpace(s))
                        return (double?)null;

                    return double.TryParse(s, NumberStyles.Any, CultureInfo.InvariantCulture, out var n) ? n : (double?)null;
                }).ToArray();

                value = isArray ? numericValues : numericValues[0];
                break;
            case DbType.Boolean:
                var boolValues = values.Select(a => a != null && a.ToString().ToLower() != "false" && a.ToString() != "0").ToArray();
                value = isArray ? boolValues : boolValues[0];
                break;
        }

        return value;
    }
}