using System;
using System.Collections;
using System.Globalization;
using BS.Shared.Extensions;

namespace BeWo.Validation
{
    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
    public class ValidationAttribute : Attribute
    {
        public ValidationAttribute()
        {
            this.ValidationRule = ValidationRules.AlwaysValid;
        }

        public ValidationRules ValidationRule { get; set; }

        // Claude: pContext liefert den Klientenbezug fuer EmptyNoticeInNewServiceRecordsAllowed.
        // null bedeutet "unbekannt" -> bisheriges Verhalten (Pflichtfeld bleibt).
        public bool Validate(object pValue, ICustomerRelatedContext pContext = null)
        {
            bool lResult = true;
            switch (ValidationRule)
            {
                case ValidationRules.NotZero:
                    double lNumber;
                    var lIsNumber = Double.TryParse(pValue.ToStringNullCheck(), out lNumber);
                    if (lIsNumber)
                    {
                        lResult = Math.Abs(lNumber) > 0d;
                    }

                    break;
                case ValidationRules.GreaterThanZero:
                    if (pValue == null)
                    {
                        lResult = false;
                    }
                    else
                    {
                        double lNumber2;
                        var lIsNumber2 = Double.TryParse(pValue.ToStringNullCheck(), out lNumber2);
                        if (lIsNumber2)
                        {
                            lResult = lNumber2 > 0d;
                        }
                    }

                    break;
                case ValidationRules.GreaterThanOrEqualZero:
                    if (pValue == null)
                    {
                        lResult = false;
                    }
                    else
                    {
                        double lNumber3;
                        var lIsNumber3 = Double.TryParse(pValue.ToStringNullCheck(), out lNumber3);
                        if (lIsNumber3)
                        {
                            lResult = lNumber3 >= 0d;
                        }
                    }

                    break;
                case ValidationRules.NotNullOrStringEmpty:
                    if (pValue is string)
                    {
                        lResult = ((string)pValue).Trim() != string.Empty;
                    }
                    else
                    {
                        lResult = pValue != null;
                    }

                    break;
                case ValidationRules.EmptyNoticeInNewServiceRecordsAllowed:
                    // Claude: Dokumentationspflicht greift nur noch bei klientenbezogenen
                    // Eintraegen (Customer/Hilfeplan). Ohne Klientenbezug - in
                    // ServiceRecordView2 also bei abgewaehlter CheckBox "chkWithClient" -
                    // ist die Dokumentation niemals Pflicht.
                    if (BeWoApp.AppSettings.IsServiceRecordNoticeMandatory
                        && (pContext == null || pContext.IsCustomerRelated))
                    {
                        if (pValue is string)
                        {
                            lResult = ((string)pValue).Trim() != string.Empty;
                        }
                        else
                        {
                            lResult = pValue != null;
                        }
                    }

                    break;
                case ValidationRules.CollectionNotEmpty:
                    if (pValue is ICollection)
                    {
                        lResult = (pValue as ICollection).Count > 0;
                    }

                    break;
            }

            return lResult;
        }
    }
}