using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using Microsoft.EntityFrameworkCore;
namespace EFGetTable
{
 class Program
 {
  static void Main(string[] args)
  {
   string prdconnectionstring = "Data Source=localhost;initial catalog=ttPRD;user id=sa;password=password;MultipleActiveResultSets=True";

   var prd = GetTableNames(prdconnectionstring);

   string qasconnectionstring = "Data Source=localhost;initial catalog=ttqas;user id=sa;password=password;MultipleActiveResultSets=True";

   var qas = GetTableNames(qasconnectionstring);

   CompareTable(prd, qas);
  }

  public static List<TableInfo> GetTableNames(string connectionstr)
  {

   var tableresult = new List<TableInfo>();
   string sqlTableName = "Select * From Information_Schema.Tables";
   using (SqlConnection connection = new SqlConnection(connectionstr))
   {
    using (SqlCommand cmd = new SqlCommand(sqlTableName, connection))
    {
     try
     {
      connection.Open();
      SqlDataReader dr = cmd.ExecuteReader();//

      while (dr.Read())
      {
       // 表名
       TableInfo table = new TableInfo();

       table.TableName = dr["Table_Name"].ToString();


       table.columns.AddRange(GetColumnNamesByTable(dr["Table_Name"].ToString(), connection));
       tableresult.Add(table);
      }


      connection.Close();

     }
     catch (System.Data.SqlClient.SqlException e)
     {
      Console.ForegroundColor = ConsoleColor.Red;
      Console.Error.WriteLine(e.Message);
      connection.Close();
     }
    }

    return tableresult;
   }


  }
  public static List<CloumnInfo> GetColumnNamesByTable(string tableName, SqlConnection connection)
  {

   var Columnresults = new List<CloumnInfo>();
   string sqlcolum = $"Select * From Information_Schema.Columns t Where t.Table_Name =\'{tableName}\'";

   using (SqlCommand cmd = new SqlCommand(sqlcolum, connection))
   {

    SqlDataReader dr = cmd.ExecuteReader();//

    while (dr.Read())
    {
     // 表名
     CloumnInfo column = new CloumnInfo();
     column.CloumnName = dr["Column_name"].ToString();
     column.DateType = dr["DATA_TYPE"].ToString() + dr["CHARACTER_MAXIMUM_LENGTH"].ToString();
     Columnresults.Add(column);
    }

    return Columnresults;

   }
  }
  public static void CompareTable(List<TableInfo> prd, List<TableInfo> qas)
  {
   foreach (var p in qas)
   {
    var tablequery = prd.AsQueryable().Where(t => t.TableName.Equals(p.TableName));
    if (!tablequery.Any())
    {
     Console.WriteLine($"New Created Table {p.TableName}");
     continue;
    }
    else
    {
     var querytable = tablequery.FirstOrDefault();
     p.columns.ForEach(c =>
     {
      var Cloumnquery = querytable.columns.Select(cc => cc.CloumnName).Contains(c.CloumnName);

      if (!Cloumnquery)
      {
       Console.WriteLine($"New add cloumn： {c.CloumnName} on Table {p.TableName}");

      }

      else
      {
       var querycloumn = querytable.columns.Where(qt => qt.CloumnName.Equals(c.CloumnName)).FirstOrDefault();
       if (!querycloumn.DateType.Equals(c.DateType))
       {
        Console.WriteLine($"DateType Different: cloumn: {c.CloumnName} , {querycloumn.DateType}==>{c.DateType} on Table {p.TableName}");

       }
      }
     });
    }
   }
  }

 }

 public class TableInfo
 {
  public TableInfo()
  {
   columns = new List<CloumnInfo>();
  }
  public string TableName { get; set; }
  public List<CloumnInfo> columns { get; set; }
 }

 public class CloumnInfo
 {
  public string CloumnName { get; set; }
  public string DateType { get; set; }

 }
}