using TINK.Model;

namespace TINK.ViewModel.Settings
{
    /// <summary>Holds filter item incluting full state (avaialble, activated, name, ...). </summary>
    public class FilterItemMutable
    {
        /// <summary> Switch value</summary>
        private bool m_bIsActivatedSwitch;

        /// <summary> Constructs a filter object. </summary>
        /// <param name="p_strKey">Key of the filter state.</param>
        /// <param name="p_oFilterState">State of filter, on or off.</param>
        /// <param name="p_bIsEnabled">If filter does not apply because user does not belong to group (TINK, Konrad, ...) filter is deactivated.</param>
        /// <param name="p_strLabelText">Text of the switch describing the filter.</param>
        public FilterItemMutable(
            string p_strKey, 
            FilterState p_oFilterState, 
            bool p_bIsEnabled, 
            string p_strLabelText)
        {
            Text = p_strLabelText;
            IsEnabled = p_bIsEnabled;
            State = p_oFilterState;
            Key = p_strKey;
            m_bIsActivatedSwitch = p_bIsEnabled && p_oFilterState == FilterState.On;
        }

        /// <summary> Text describing the filter. </summary>
        public string Text { get; }

        /// <summary> True if switch can be toggeled.</summary>
        public bool IsEnabled { get;  }

        /// <summary> True if switch is on.</summary>
        public bool IsActivated
        {
            get
            {
                return m_bIsActivatedSwitch;
            }

            set
            {
                m_bIsActivatedSwitch = value;
                if (!IsEnabled)
                {
                    // Nothing to do if filter does not apply to user account.
                    return;
                }

                State = m_bIsActivatedSwitch ? FilterState.On : FilterState.Off;
            }
        }

        /// <summary> Key of the filter.</summary>
        public string Key { get; }

        /// <summary> State of the filter.</summary>
        public FilterState State { get; private set; }
    }
}