namespace Common.UI.VFM.ViewModels
{
    using Common.UI.VFM.Models;

    using System;
    using System.Collections.Generic;
    using System.Windows;

    public class ProcessStepViewModel : AppViewModel
    {
        private readonly Func<ProcessResult> process;

        public ProcessStepViewModel(String name, Func<ProcessResult> process)
        {
            this.Name = name;
            this.process = process;
            this.State = ProcessState.Undefined;
        }

        public String Name { get; }

        private ProcessState state;
        public ProcessState State
        {
            get => this.state;
            set => this.Set(() => this.state = value);
        }

        private String message;
        public String Message
        {
            get => this.message;
            set => this.Set(() => this.message = value);
        }

        internal ProcessResult StartProcessing()
        {
            this.State = ProcessState.Started;
            var result = this.process.Invoke();
            this.State = result.State;
            this.Message = result.Message;

            return result;
        }

        public static implicit operator ProcessStepViewModel(KeyValuePair<String, Func<ProcessResult>> kvp) 
            => new ProcessStepViewModel(kvp.Key, kvp.Value);
    }
}