// Copyright (C) 2019 Kazuhiro Fujieda <fujieda@users.osdn.me>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

using System.Drawing;
using System.Windows.Forms;

namespace KancolleSniffer.View
{
    public static class StringTruncator
    {
        public static string Truncate(string target, string postfix, int maxWidth, Font font = null)
        {
            if (StringWidth(target + postfix, font) <= maxWidth)
                return target;
            var truncated = "";
            foreach (var ch in target)
            {
                var tmp = truncated + ch;
                if (StringWidth(tmp + postfix, font) > maxWidth)
                    break;
                truncated = tmp;
            }
            return truncated.TrimEnd(' ');
        }

        private static readonly Font Font = new Control().Font;

        private static int StringWidth(string str, Font font)
        {
            return TextRenderer.MeasureText(str, font ?? Font, new Size(int.MaxValue, int.MaxValue)).Width;
        }
    }
}