using System;
using Deltares.Standard.IO;
using Deltares.Standard.Units;

namespace Deltares.DeltaModel
{
    public class AquoFieldDefinition : FieldDefinition
    {
        /// <summary>
        /// The unit used in the aquo file 
        /// </summary>
        private readonly Enum importedUnit;

        /// <summary>
        /// The unit type of the <see cref="importedUnit"/>
        /// </summary>
        private UnitType? importedUnitType;

        /// <summary>
        /// A field definition for conversion between a CSV adhering to the aquo standard and a property on a data model.
        /// The conversion factor is used for conversion between columns which are not using a SI-unit for their values.
        /// </summary>
        /// <param name="columnName">Name of the field in the imported file.</param>
        /// <param name="propertyName">Name of the property of the data model.</param>
        /// <param name="importedUnitType">The type of the unit of the field in the imported file.</param>
        /// <param name="importedUnit">The unit of the field in the imported file.</param>
        public AquoFieldDefinition(String columnName, String propertyName, UnitType? importedUnitType = null, Enum importedUnit = null)
            : base(columnName, propertyName)
        {
            this.importedUnit = importedUnit;
            this.importedUnitType = importedUnitType;
        }

        /// <summary>
        /// Returns a converted value of the value that is passed.
        /// </summary>
        /// <param name="value">A value that might have to be converted.</param>
        /// <returns>A possibly converted value.</returns>
        public object GetBaseValue(double value)
        {
            if (importedUnitType.HasValue && null != importedUnit)
            {
                return UnitsManager.GetBaseValue(importedUnitType.Value, importedUnit, value);
            }
            return value;
        }
    }
}