using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using FastReport.Utils;

namespace FastReport.Format
{
    /// <summary>
    /// Represents a format that uses the <b>Format</b> string to display values.
    /// </summary>
    public class CustomFormat : FormatBase
    {
        #region Fields
        private string format;
        #endregion

        #region Properties
        /// <summary>
        /// Gets or sets a format string.
        /// </summary>
        /// <remarks>
        /// Default format is "G". For example, if you want to format a date, use the following
        /// format string: "MM/dd/yyyy". See the <b>System.String.Format</b> method for list 
        /// of possible format strings.
        /// </remarks>
        public string Format
        {
            get { return format; }
            set { format = value; }
        }
        #endregion

        #region Public Methods
        /// <inheritdoc/>
        public override FormatBase Clone()
        {
            CustomFormat result = new CustomFormat();
            result.Format = Format;
            return result;
        }

        /// <inheritdoc/>
        public override bool Equals(object obj)
        {
            CustomFormat f = obj as CustomFormat;
            return f != null && Format == f.Format;
        }

        /// <inheritdoc/>
        public override int GetHashCode()
        {
            return base.GetHashCode();
        }

        /// <inheritdoc/>
        public override string FormatValue(object value)
        {
            if (value is Variant)
                value = ((Variant)value).Value;
            return String.Format("{0:" + Format + "}", value);
        }

        internal override string GetSampleValue()
        {
            return "";
        }

        internal override void Serialize(FRWriter writer, string prefix, FormatBase format)
        {
            base.Serialize(writer, prefix, format);
            CustomFormat c = format as CustomFormat;

            if (c == null || Format != c.Format)
                writer.WriteStr(prefix + "Format", Format);
        }
        #endregion

        /// <summary>
        /// Initializes a new instance of the <b>CustomFormat</b> class with default settings. 
        /// </summary>
        public CustomFormat()
        {
            Format = "G";
        }
    }
}