PIbd-31_Rodionov.I.A._COP_28/COP/RodionovLibrary/VisualComponents/ListBoxControl.cs

using System.Reflection;

namespace RodionovLibrary.VisualComponents
{
    public partial class ListBoxControl : UserControl
    {
        private string? _template;

        private char? _fromChar;

        private char? _toChar;

        public int SelectedIndex
        {
            get
            {
                return listBox.SelectedIndex;
            }
            set
            {
                listBox.SelectedIndex = value;
            }
        }

        public ListBoxControl()
        {
            InitializeComponent();
        }

        public void SetParams(string template, char fromChar, char toChar)
        {
            _template = template;
            _fromChar = fromChar;
            _toChar = toChar;
        }

        public T? GetObject<T>()
        {
            if (listBox.SelectedIndex == -1 || string.IsNullOrEmpty(_template) || !_fromChar.HasValue || !_toChar.HasValue)
                throw new ArgumentException("Не хватает данных");

            var type = typeof(T);
            var fields = type.GetFields();
            var properties = type.GetProperties();
            var members = fields.Cast<MemberInfo>().Concat(properties.Cast<MemberInfo>()).ToArray(); 

            var curObject = Activator.CreateInstance(type) ?? throw new Exception("Не получилось создать объект заданного типа");
            string text = listBox.SelectedItem?.ToString() ?? "";

            var fixedParts = System.Text.RegularExpressions.Regex.Split(_template, $@"\{_fromChar.Value}.*?\{_toChar.Value}");

            int firstFixedStart = text.IndexOf(fixedParts[0], 0);
            if (firstFixedStart == -1)
                throw new Exception("Не найден элемент шаблона");
            if (firstFixedStart != 0)
            {
                string beginning = text[..firstFixedStart];
                FillMember(_template.Substring(1, firstFixedStart - 2), curObject, beginning, members);
            }

            int start = 0;

            for (int i = 0; i < fixedParts.Length - 1; i++)
            {
                start = text.IndexOf(fixedParts[i], start);
                if (start == -1)
                    throw new Exception("Не найден элемент шаблона");
                start += fixedParts[i].Length;

                int nextFixedIndex = text.IndexOf(fixedParts[i + 1], start);
                if (nextFixedIndex == -1)
                    throw new Exception("Не найден следующий элемент шаблона");

                string valueBetween = text[start..nextFixedIndex];

                string templatePart = _template.Substring(_template.IndexOf(fixedParts[i]) + fixedParts[i].Length);
                int startCharIndex = templatePart.IndexOf(_fromChar.Value);
                int endCharIndex = templatePart.IndexOf(_toChar.Value);
                string memberName = templatePart.Substring(startCharIndex + 1, endCharIndex - startCharIndex - 1);

                FillMember(memberName, curObject, valueBetween, members);

                start = nextFixedIndex;
            }

            return (T?)curObject;
        }

        public void AddItems<T>(List<T> items)
            where T : class
        {
            if (string.IsNullOrEmpty(_template) || !_fromChar.HasValue || !_toChar.HasValue) 
                throw new ArgumentException("Не хватает данных");
            listBox.Items.Clear();
            var type = typeof(T);
            var fields = type.GetFields();
            var properties = type.GetProperties();
            var members = fields.Cast<MemberInfo>().Concat(properties.Cast<MemberInfo>()).ToArray();
            foreach (T item in items)
            {
                string result = _template;
                foreach (var member in members)
                {
                    string search = _fromChar.Value + member.Name + _toChar.Value;
                    object? value = null;
                    if (member is FieldInfo field)
                    {
                        value = field.GetValue(item);
                    }
                    if (member is PropertyInfo property)
                    {
                        if (property.CanRead)
                        {
                            value = property.GetValue(item);
                        }
                    }
                    result = result.Replace(search, value?.ToString() ?? "");
                }
                listBox.Items.Add(result);
            }
        }

        private void FillMember(string memberName, object curObject, string value, MemberInfo[]? members)
        {
            var member = members?.FirstOrDefault(x => x.Name == memberName)
                    ?? throw new Exception("Ошибка с поиском элемента");
            object convertedValue = Convert.ChangeType(value, GetMemberType(member));

            SetMemberValue(curObject, member, convertedValue);
        }

        private Type GetMemberType(MemberInfo member)
        {
            return member is PropertyInfo property ? property.PropertyType : ((FieldInfo)member).FieldType;
        }

        private void SetMemberValue(object obj, MemberInfo member, object value)
        {
            if (member is PropertyInfo property)
            {
                property.SetValue(obj, value);
            }
            else if (member is FieldInfo field)
            {
                field.SetValue(obj, value);
            }
        }
    }
}