using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlTypes;
using System.Drawing;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        string folderName = "GenFolder"; // 文件夹名称
        private void Form1_Load(object sender, EventArgs e)
        {
            this.txt_tablename.Items.AddRange(GetTableName().ToArray());
        }
        /// <summary>
        /// 将数据库字段转换为驼峰命名
        /// </summary>
        /// <param name="dbField"></param>
        /// <returns></returns>
        public static string ToCamelCase(string dbField)
        {
            string[] words = dbField.Split('_');
            for (int i = 1; i < words.Length; i++)
            {
                words[i] = char.ToUpper(words[i][0]) + words[i].Substring(1);
            }
            return string.Join("", words);
        }

        // 根据数据库表名生成实体类名称
        static string GenerateClassName(string tableName)
        {
            string[] words = tableName.Split('_');

            StringBuilder sb = new StringBuilder();
            foreach (string word in words)
            {
                sb.Append(CultureInfo.CurrentCulture.TextInfo.ToTitleCase(word.ToLower()));
            }

            return sb.ToString();
        }


        private void button1_Click(object sender, EventArgs e)
        {
            //string constr = txt_constr.Text.Trim();//数据库链接字符串
            txt_ret.Text = "";
            string tbname = txt_tablename.Text.Trim();//要生成的表名
            if (tbname.Equals("请选择") || tbname.Equals("")) {
                MessageBox.Show("请选择表");
                return; 
            };
            string namespaceName = namespace_name.Text.Trim();
            var dt = GetDbTableInfo(tbname);
            var list = new List<string>();
            txt_ret.Text += "using System;\n" +
                            "using NCA_MES_Models.CommonUtils.DB.DBAttribute;\n\n";
            txt_ret.Text += "namespace "+ namespaceName + "{\n\n";
            txt_ret.Text += "/// <summary>" + "\n" +
                            "/// " + GetTableComment(tbname) + "\n"+
                            "/// </summary>" + "\n" +
                            "[TableName(\"" + tbname + "\")]" + "\n"+
                            "public class " + GenerateClassName(tbname) + " {";
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                var Name = dt.Rows[i]["Name"].ToString();
                var Type = dt.Rows[i]["Type"].ToString();
                var IsNullable = dt.Rows[i]["COMMENT"].ToString();
                Type type = DbTypeStr_To_CsharpType(Type);
                //txt_ret.Text += @"/// <summary>" + "\n" + "///" + IsNullable + "\n" + " /// </summary>\n" +""+ " public " + type.Name +"  "+ Name + " { get; set; }" + "\n";//不加注释版本
                txt_ret.Text += "\n\t" + @"/// <summary>" +
                                "\n\t" + "///" + IsNullable +
                                "\n\t" + "/// </summary>" +
                                "\n\t" + "[TableField(\""+ Name + "\")]" +
                                "\n\t"+ " public " + type.Name +"  "+ ToCamelCase(Name) + " { get; set; }"; 
                                //加注释记得引用using
            }
            txt_ret.Text += "\n}\n}";
            // 创建文件夹
            string folderPath = Path.Combine(Environment.CurrentDirectory, folderName);
            Directory.CreateDirectory(folderPath);

            // 创建文件并写入内容
            string filePath = Path.Combine(folderPath, GenerateClassName(tbname)+".cs");
            File.WriteAllText(filePath, txt_ret.Text);

            // 打开文件夹
            System.Diagnostics.Process.Start(folderPath);
        }


        //订单下拉模糊搜索
        private void orderId_TextUpdate(object sender, EventArgs e)   //不要用TextChanged
        {
            string s = this.txt_tablename.Text;              //获取输入内容
            List<string> sList = GetTableName(s);    //存放数据库查询结果
            //提前下拉，以显示搜索结果（必须要在添加项之前下拉，否则会将第一项自动添加到编辑框内 覆盖掉输入的内容）
            this.txt_tablename.DroppedDown = true;      //显示下拉列表，但是显示后鼠标指针就不见了
            Cursor.Current = Cursors.Default;                  //将指针显示出来

            //在表中已录入名字中寻找包含输入内容的项  有则添加到comboBox项中 
            this.txt_tablename.Items.Clear();
            this.txt_tablename.Items.AddRange(sList.ToArray());
            this.txt_tablename.Select(this.txt_tablename.Text.Length, 0);
        }

        /// <summary>
        /// 根据参数，获取数据表信息
        /// </summary>
        /// <param name="tabname"></param>
        public static DataTable GetDbTableInfo(string tabname)
        {
            string str = string.Format(@"SELECT COLUMN_NAME AS Name, COLUMN_TYPE AS Type,COLUMN_COMMENT AS COMMENT 
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = '{0}';", tabname);

            var dt = DbHelperMySQL.Query(str);
            return dt;
        }


        public static List<string> GetTableName(string tableName)
        {
            string sql = $"SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = '{DbHelperMySQL.DbName}' AND TABLE_NAME LIKE '{tableName}%' limit 10;";
            var dt = DbHelperMySQL.Query(sql);
            //查询数据库表中所有已录入人员
            List<string> sList = new List<string>();    //存放数据库查询结果
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                sList.Add(dt.Rows[i]["TABLE_NAME"].ToString());
            }
            return sList;
            //return dt;
        }
        public static string GetTableComment(string tableName)
        {
            string sql = $"SELECT TABLE_COMMENT FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = '{DbHelperMySQL.DbName}' AND TABLE_NAME ='{tableName}';";
            var dt = DbHelperMySQL.Query(sql);

            if(dt.Rows.Count<1) return tableName;
            return dt.Rows[0]["TABLE_COMMENT"].ToString();
        }

        public static List<string> GetTableName()
        {
            string sql = $"SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = '{DbHelperMySQL.DbName}';";
            var dt = DbHelperMySQL.Query(sql);
            //查询数据库表中所有已录入人员
            List<string> sList = new List<string>();    //存放数据库查询结果
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                sList.Add(dt.Rows[i]["TABLE_NAME"].ToString());
            }
            return sList;
            //return dt;
        }

        /// <summary>
        /// 类型转换枚举
        /// </summary>
        protected Dictionary<string, Type> DbTypeDic { get; } = new Dictionary<string, Type>()
        {
            { "int", typeof(Int32) },
            { "text", typeof(string) },
            { "bigint", typeof(Int64) },
            { "binary", typeof(byte[]) },
            { "bit", typeof(bool) },
            { "char", typeof(string) },
            { "date", typeof(DateTime) },
            { "datetime", typeof(DateTime) },
            { "datetime2", typeof(DateTime) },
            { "decimal", typeof(decimal) },
            { "float", typeof(double) },
            { "image", typeof(byte[]) },
            { "money", typeof(decimal) },
            { "nchar", typeof(string) },
            { "ntext", typeof(string) },
            { "numeric", typeof(decimal) },
            { "nvarchar", typeof(string) },
            { "real", typeof(Single) },
            { "smalldatetime", typeof(DateTime) },
            { "smallint", typeof(Int16) },
            { "smallmoney", typeof(decimal) },
            { "timestamp", typeof(DateTime) },
            { "tinyint", typeof(byte) },
            { "varbinary", typeof(byte[]) },
            { "varchar", typeof(string) },
            { "variant", typeof(object) },
            { "uniqueidentifier", typeof(Guid) },
        };
        /// <summary>
        /// 获取字段类型
        /// </summary>
        /// <param name="dbTypeStr"></param>
        /// <returns></returns>
        public virtual Type DbTypeStr_To_CsharpType(string dbTypeStr)
        {
            if (dbTypeStr.Contains('('))
            {
                string[] strings = dbTypeStr.Split('(');
                dbTypeStr = strings[0];
            }
            string _dbTypeStr = dbTypeStr.ToLower();
            Type type = null;
            if (DbTypeDic.ContainsKey(_dbTypeStr))
                type = DbTypeDic[_dbTypeStr];
            else
                type = typeof(string);

            return type;
        }


    }
}