using ModelTools.Enums;
using System;
using System.Collections.Generic;

namespace ModelTools.Models
{
    /// <summary>
    /// Результат любой операции с сущностью
    /// </summary>
	public class OperationResultModel
	{
		/// <summary>
		/// Успешность операции (количество ошибок = 0)
		/// </summary>
		public bool IsSucceeded => Errors.Count == 0;

		/// <summary>
		/// Статус операции
		/// </summary>
		public ResultServiceStatusCode StatusCode { get; set; }

        /// <summary>
        /// Спсиок ошибок
        /// </summary>
        public List<(string Title, string Message)> Errors { get; private set; }

        /// <summary>
        /// Объект, получаемый по результатам операции
        /// </summary>
        public object Result { get; private set; }

        /// <summary>
        /// Конструктор по умолчанию
        /// </summary>
        public OperationResultModel()
        {
            Errors = new List<(string Title, string Message)>();
            StatusCode = ResultServiceStatusCode.Success;
        }

        /// <summary>
        /// Успешно
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static OperationResultModel Success(object obj)
        {
            return new OperationResultModel
            {
                Result = obj,
                Errors = new List<(string Title, string Message)>(),
                StatusCode = ResultServiceStatusCode.Success
            };
        }

        /// <summary>
        /// Добавление простой ошибки
        /// </summary>
        /// <param name="model"></param>
        /// <param name="key"></param>
        /// <param name="value"></param>
		public static OperationResultModel Error(string key, string value) => Error(key, value, ResultServiceStatusCode.Error);

        /// <summary>
        /// Добавление простой ошибки со сменой статуса
        /// </summary>
        /// <param name="model"></param>
        /// <param name="key"></param>
        /// <param name="error"></param>
        /// <param name="statusCode"></param>
		public static OperationResultModel Error(string key, string error, ResultServiceStatusCode statusCode)
        {
            var model = new OperationResultModel();
            model.Errors.Add((key, error));
            model.StatusCode = statusCode;
            return model;
        }

        /// <summary>
        /// Добавление ошибки
        /// </summary>
        /// <param name="model"></param>
        /// <param name="error"></param>
        public static OperationResultModel Error(Exception error) => Error(error, ResultServiceStatusCode.Error);

        /// <summary>
        /// Добавление ошибки
        /// </summary>
        /// <param name="model"></param>
        /// <param name="error"></param>
        /// <param name="statusCode"></param>
        public static OperationResultModel Error(Exception error, ResultServiceStatusCode statusCode) => Error("Ошибка", error, statusCode);

        /// <summary>
        /// Добавление ошибки (включая вложеннные)
        /// </summary>
        /// <param name="model"></param>
        /// <param name="key"></param>
        /// <param name="error"></param>
        /// <param name="statusCode"></param>
        public static OperationResultModel Error(string key, Exception error, ResultServiceStatusCode statusCode)
        {
            var model = new OperationResultModel();
            model.Errors.Add((key, error.Message));
            while (error.InnerException != null)
            {
                error = error.InnerException;
                model.Errors.Add(("Inner error:", error.Message));
            }
            model.StatusCode = statusCode;
            return model;
        }
    }
}