using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Windows.Forms;
using System.Configuration;
using System.Collections;
using System.Drawing;
using System.IO;

using CnasSynchronousCommon;
using System.Xml;

namespace CNAS_DBSync
{

    struct FieldLine
    {
        Label label;
        Control editor;
        Button button;
        int size;

        public FieldLine(Label label, Control editor, Button button = null)
        {
            this.label = label;
            this.editor = editor;
            this.button = button;
            int count = 0;
            if (label != null) count++;
            if (editor != null) count++;
            if (button != null) count++;
            size = count;
        }

        public Label Label
        {
            get
            {
                return label;
            }
        }
        public Control Editor
        {
            get
            {
                return editor;
            }
        }

        public Button Button
        {
            get
            {
                return button;
            }
        }

    }

    /// <summary>
    /// 设置容器内编辑字段位置的公共算法
    /// </summary>
    class FormSizeHelper
    {
        private static readonly string strLocalConfigPath = FileHelper.getBasePath() + @"\Data\";
        private static readonly string FormSizeXml = "FormSize.xml";
        private static readonly FormSizeHelper instance;
        private Hashtable formSizes;

        // 静态构造函数确保线程安全且延迟加载。 
        static FormSizeHelper() {
            instance = new FormSizeHelper();
        }

        // 防止外部实例化。
        private FormSizeHelper() {
            Init();
        } 
        public static FormSizeHelper Instance => instance; // 提供全局访问点。

        public static void Arrange(Panel container, FieldLine[] fields, int span1 = 1, int span2 = 1)
        {
            int colLabel = 0;
            int colEditor = 0;
            int colButton = 0;
            
            int lbLeft = -1;
            for (int i = 0; i < fields.Length; i++)
            {
                if (lbLeft == -1)
                {
                    if (fields[i].Label != null)
                        lbLeft = fields[i].Label.Left;
                }
                else if (fields[i].Label != null && fields[i].Label.Left >= 0 && fields[i].Label.Left < lbLeft)
                {
                    lbLeft = fields[i].Label.Left;
                }
            }

            int width = lbLeft < 0 ? (container.Width * 80 / 100) : (container.Width-lbLeft*2);
            int marginLeft = (container.Width - width) / 2;
            
            for (int i=0;i< fields.Length; i++)
            {
                if(fields[i].Label != null && fields[i].Label.Width > colLabel)
                {
                    colLabel = fields[i].Label.Width;
                }
                if (fields[i].Button != null && fields[i].Button.Width > colButton)
                {
                    colButton = fields[i].Button.Width;
                }
            }

            colEditor = width - (colLabel + span1 + span2 + colButton);

            for (int i = 0; i < fields.Length; i++)
            {
                //Label不动

                //改变Editor
                if (fields[i].Editor != null)
                {
                    if(fields[i].Editor is TextBox)
                    {
                        TextBox tb = (TextBox)fields[i].Editor;
                        //tb.Left = marginLeft + colLabel + span1;
                        tb.Width = colEditor;
                        if(fields[i].Button != null)
                        {
                            fields[i].Button.Left = tb.Left + colEditor + span2;
                        }
                    }


                    if(fields[i].Editor is CheckBox)
                    {
                        //不动
                    }

                    if(fields[i].Editor is ComboBox)
                    {
                        ComboBox tb = (ComboBox)fields[i].Editor;
                        //tb.Left = marginLeft + colLabel + span1;
                        tb.Width = colEditor;
                        if (fields[i].Button != null)
                        {
                            fields[i].Button.Left = tb.Left + colEditor + span2;
                        }
                    }

                }

            }


        }

        private static bool ValidBound(Form form, int x, int y, int w, int h)
        {
            if (x>=0 && y >= 0 && w>0 && h > 0)
{
                Screen screen = Screen.FromControl(form);
                Rectangle r = screen.Bounds;
                return (x + w < r.Width && y + h < r.Height);
            }
            
            return false;
        }

        private void Init()
        {
            formSizes = new Hashtable(10);
            string strUrl = strLocalConfigPath + FormSizeXml;
            try
            {
                if (!File.Exists(strUrl)) return;

                XmlDocument doc = new XmlDocument();
                doc.Load(strUrl);
                XmlNode root = doc.DocumentElement;
                foreach (XmlNode node in root.ChildNodes)
                {
                    string formname = node.Name;
                    string value = node.InnerText;
                    formSizes.Add(formname, value);
                }
            }
            catch (Exception ex)
            {
                AppLog.Error(ex.Message);
            }
            
        }

        public List<string> LoadDefaultSize(Form form, string key, out bool changed)
        {
            changed = false;
            if (formSizes.ContainsKey(key))
            {
                string value = formSizes[key] as string;
                string[] values = value.Split(',');
                if (values.Length >= 4)
                {
                    int x, y, w, h;
                    if (int.TryParse(values[0], out x) && int.TryParse(values[1], out y) &&
                        int.TryParse(values[2], out w) && int.TryParse(values[3], out h))
                    {
                        if (ValidBound(form, x, y, w, h))
                        {
                            form.Left = x;
                            form.Top = y;
                            form.Width = w;
                            form.Height = h;
                            changed = true;
                        }
                    }

                    if (changed && values.Length > 4)
                    {
                        List<string> list = new List<string>(values.Length - 4);
                        for (int i = 4; i < values.Length; i++)
                        {
                            list.Add(values[i]);
                        }
                        return list;
                    }
                }
            }
            return null;
        }

        public bool SaveDefaultSize(string key, string value)
        {
            if (!string.IsNullOrEmpty(key) && !string.IsNullOrEmpty(value))
            {
                formSizes[key] = value;
                StringBuilder sb = new StringBuilder();
                sb.Append("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<Forms>\n");
                foreach(object k in formSizes.Keys)
                {
                    string line = string.Format("<{0}>{1}</{0}>", k, formSizes[k]);
                    sb.Append(line).Append("\n");
                }
                sb.Append("</Forms>");
                try
                {
                    bool bIfSuccess = FileHelper.SaveLocalFile(strLocalConfigPath, FormSizeXml, sb.ToString());
                    return bIfSuccess;
                }
                catch (Exception ex)
                {
                    AppLog.Error(ex.Message);
                }
            }
            return true;
        }

    }
}