using System;
using Shared;

#if __IOS__
using UIKit;
using Foundation;
#else
using Android.Graphics;
#endif

namespace HDL_ON.UI
{
    /// <summary>
    /// TextButton
    /// 解决iOS 文本到边框有边距问题
    /// 支持根据文本动态计算高度
    /// </summary>
    public class TextButton : Button
    {
        public TextButton()
        {
#if __IOS__
            //重写修改文本到边框的内边距为0
            (this.uiView as MyButton).ContentEdgeInsets = new UIEdgeInsets(0, 0, 0, 0);
#endif

        }

        /// <summary>
        /// 设置需要限制的最大行数
        /// 但是超过行数的话会缺少省略号...，暂时无法解决
        /// </summary>
        public int MaxLine = 0;
        /// <summary>
        /// 动态计算高度
        /// 赋值文本后和指定宽度后，通过计算真实的需要宽度和指定宽度算出多行需要的真实高度
        /// 该方法有误差不能100%准确
        /// 最正确方法是根据 单行单个字体的高度加上行距来计算
        /// </summary>
        /// <returns></returns>
        public int GetMoreLineNeedHeight()
        {
            //计算需要的真实宽度
            int needWidth = this.GetTextWidth();
            //计算在指定宽度情况下，需要的真实行数
            int line = (needWidth / this.Width);
            //求余
            int modValue = (needWidth % this.Width);
            //余大于0，则多加一行
            if (modValue > 0)
            {
                line = line + 1;
            }
            if (line > 0)
            {
                if(MaxLine != 0)
                {
                    line = Math.Min(line, MaxLine);
                }
                return line * this.Height;
            }
            else
            {
                return this.Height;
            }
        }

        int _lineSpacing;
        /// <summary>
        /// 设置行间距
        /// </summary>
        public int LineSpacing
        {
            set
            {
                _lineSpacing = value;
                SetButtonLineSpacing(_lineSpacing);
            }
        }


#if __IOS__
        /// <summary>
        /// 按钮设置行距方法
        /// </summary>
        /// <param name="spacing"></param>
        void SetButtonLineSpacing(int spacing)
        {
            UIStringAttributes stringAttributes = new UIStringAttributes
            {
                Font = (this.uiView as MyButton).TitleLabel.Font,
                ForegroundColor = UIColor.Black,
                ParagraphStyle = new NSMutableParagraphStyle() { LineSpacing = spacing }
            };
            var AttributedText = new NSMutableAttributedString(Text);
            AttributedText.AddAttributes(stringAttributes, new NSRange(0, Text.Length));
            (this.uiView as MyButton).TitleLabel.AttributedText = AttributedText;
        }

        /// <summary>
        /// 显示当前文字需要几行
        /// </summary>
        /// <returns></returns>
        public int GetNeedLinesWithWidth()
        {
            return (this.GetTextWidth() / this.Width) * this.Height;
            //return 0;
        }


#else

        /// <summary>
        /// 按钮设置行距方法
        /// </summary>
        /// <param name="spacing"></param>
        void SetButtonLineSpacing(int spacing)
        {
           (this.AndroidView as Android.Widget.Button).SetLineSpacing(spacing, 1);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
        int GetTextHeight()
        {
            string text = "Text";
            Rect rect = new Rect();
            (this.AndroidView as Android.Widget.Button).Paint.GetTextBounds(text, 0, text.Length, rect);
            return rect.Height();
        }
#endif
    }



}