using GummingCommon;
using GummingControl;
using GummingEntity;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SQLite;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GummingBusiness
{
    public class {ClassName}DA
    {
        public static int ReadTotalCount(PagerEntity se)
        {
            string dbPath = FilesDirectory.DatabasePath;
            if (!File.Exists(dbPath))
            {
                throw new Exception("database missing!");
            }
            try
            {
                SQLiteConnection conn = SQLiteHelper.CreateConnection();
                if (conn.State != System.Data.ConnectionState.Open)
                {
                    conn.Open();
                    SQLiteCommand cmd = new SQLiteCommand();
                    cmd.Connection = conn;
                    cmd.CommandText = "SELECT count(*) FROM {TableName} WHERE IsActive>0 " + se.Conditions;
                    SQLiteDataReader sr = cmd.ExecuteReader();
                    sr.Read();
                    int count = sr.GetInt32(0);
                    sr.Close();
                    conn.Close();
                    return count;
                }
            }
            catch (Exception ex)
            {
                throw new Exception("打开数据库：" + dbPath + "的连接失败：" + ex.Message);
            }
            return 0;
        }

        public static {ClassName}Entity Load(string recId)
        {
            string dbPath = FilesDirectory.DatabasePath;
            if (!File.Exists(dbPath))
            {
                throw new Exception("database missing!");
            }
            try
            {                
                SQLiteConnection conn = SQLiteHelper.CreateConnection();
                if (conn.State != System.Data.ConnectionState.Open)
                {
                    conn.Open();
                    DataTable dt = SQLiteHelper.ExecuteDataTable(conn, "SELECT * FROM {TableName} WHERE RecId ='" + recId + "' limit 1");
                    List<{ClassName}Entity> rows = SQLiteHelper.DataTableToIList<{ClassName}Entity>(dt) as List<{ClassName}Entity>;
                    conn.Close();
                    if (rows.Count > 0)
                    {
                        return rows[0];
                    }
                }
            }
            catch (Exception ex)
            {
                throw new Exception("打开数据库：" + dbPath + "的连接失败：" + ex.Message);
            }
            return null;
        }

        public static RecordEntity Load(PagerEntity se)
        {
            string dbPath = FilesDirectory.DatabasePath;
            if (!File.Exists(dbPath))
            {
                throw new Exception("database missing!");
            }
            try
            {
                int count = ReadTotalCount(se);
                //se.OrderBy, se.SortOrder, se.PageIndex, se.Rows
                SQLiteConnection conn = SQLiteHelper.CreateConnection();
                if (conn.State != System.Data.ConnectionState.Open)
                {
                    conn.Open();
                    DataTable dt = SQLiteHelper.ExecuteDataTable(conn, "SELECT * FROM {TableName} WHERE IsActive>0 " + se.Conditions + " order by ModifyTime desc limit " +
                      Convert.ToString(se.Rows) + " offset " + Convert.ToString((se.PageIndex - 1) * se.Rows));
                    List<{ClassName}Entity> rows = SQLiteHelper.DataTableToIList<{ClassName}Entity>(dt) as List<{ClassName}Entity>;
                    conn.Close();
                    RecordEntity result = new RecordEntity();
                    result.total = (int)Math.Ceiling(count * 1.0 / se.Rows);
                    result.page = se.PageIndex;
                    result.records = count;
                    result.rows = rows;
                    return result;
                }
            }
            catch (Exception ex)
            {
                throw new Exception("打开数据库：" + dbPath + "的连接失败：" + ex.Message);
            }
            return null;
        }

        public static void Save({ClassName}Entity segment)
        {
            string dbPath = FilesDirectory.DatabasePath;
            if (!File.Exists(dbPath))
            {
                throw new Exception("database missing!");
            }
            try
            {
                SQLiteConnection conn = SQLiteHelper.CreateConnection();
                if (conn.State != System.Data.ConnectionState.Open)
                {
                    conn.Open();
                    using (SQLiteTransaction tran = conn.BeginTransaction())
                    {
                        Save(conn, segment); 
                        tran.Commit();
                    }
                    conn.Close();
                }
            }
            catch (Exception ex)
            {
                throw new Exception("打开数据库：" + dbPath + "的连接失败：" + ex.Message);
            }
        }

        public static void Save(SQLiteConnection conn, {ClassName}Entity segment)
        {
            SQLiteCommand cmd = new SQLiteCommand();
            cmd.Connection = conn;
            cmd.CommandText = "INSERT INTO {TableName} ({InsertAllFields}) values({All@Fields})";
            cmd.Parameters.AddWithValue("@RecId", Guid.NewGuid().ToString());
            //{AddWithParameters}
            cmd.Parameters.AddWithValue("@OrderBy", segment.OrderBy);
            cmd.Parameters.AddWithValue("@CreateBy", Global.CurrentUserCode);
            cmd.Parameters.AddWithValue("@CreateTime", DateTime.Now);
            cmd.Parameters.AddWithValue("@ModifyBy", Global.CurrentUserCode);
            cmd.Parameters.AddWithValue("@ModifyTime", DateTime.Now);
            cmd.Parameters.AddWithValue("@IsActive", 1);
            cmd.ExecuteNonQuery();
        }

        public static void Update({ClassName}Entity segment)
        {
            string dbPath = FilesDirectory.DatabasePath;
            if (!File.Exists(dbPath))
            {
                throw new Exception("database missing!");
            }
            try
            {
                SQLiteConnection conn = SQLiteHelper.CreateConnection();
                if (conn.State != System.Data.ConnectionState.Open)
                {
                    conn.Open();
                    using (SQLiteTransaction tran = conn.BeginTransaction())
                    {
                        Update(conn, segment); 
                        tran.Commit();
                    }
                    conn.Close();
                }
            }
            catch (Exception ex)
            {
                throw new Exception("打开数据库：" + dbPath + "的连接失败：" + ex.Message);
            }
        }

        public static void Update(SQLiteConnection conn, {ClassName}Entity segment)
        {
            SQLiteCommand cmd = new SQLiteCommand();
            cmd.Connection = conn;
            cmd.CommandText = "UPDATE {TableName} SET {Update__SqlParametersNames}, OrderBy = @OrderBy, ModifyBy = @ModifyBy, ModifyTime = @ModifyTime, IsActive = @IsActive WHERE RecId = @RecId";
            cmd.Parameters.AddWithValue("@RecId", segment.RecId);
            //{AddWithParameters}
            cmd.Parameters.AddWithValue("@OrderBy", segment.OrderBy);            
            cmd.Parameters.AddWithValue("@ModifyBy", Global.CurrentUserCode);
            cmd.Parameters.AddWithValue("@ModifyTime", DateTime.Now);
            cmd.Parameters.AddWithValue("@IsActive", 1);
            cmd.ExecuteNonQuery();
        }
   
        public static void Delete(string recid)
        {
            string dbPath = FilesDirectory.DatabasePath;
            if (!File.Exists(dbPath))
            {
                throw new Exception("database missing!");
            }
            try
            {
                SQLiteConnection conn = SQLiteHelper.CreateConnection();
                if (conn.State != System.Data.ConnectionState.Open)
                {
                    conn.Open();
                    Delete(conn, recid);
                    conn.Close();
                }
            }
            catch (Exception ex)
            {
                throw new Exception("打开数据库：" + dbPath + "的连接失败：" + ex.Message);
            }
        }

		public static void Delete(SQLiteConnection conn, string recid)
        {
            SQLiteCommand cmd = new SQLiteCommand();
            cmd.Connection = conn;
            cmd.CommandText = "delete from {TableName} where recid ='" + recid + "'";
            cmd.ExecuteNonQuery();
        }

        public static void Clear()
        {
            string dbPath = FilesDirectory.DatabasePath;
            if (!File.Exists(dbPath))
            {
                throw new Exception("database missing!");
            }
            try
            {
                SQLiteConnection conn = SQLiteHelper.CreateConnection();
                if (conn.State != System.Data.ConnectionState.Open)
                {
                    conn.Open();
                    SQLiteCommand cmd = new SQLiteCommand();
                    cmd.Connection = conn;
                    cmd.CommandText = "delete from {TableName}";
                    cmd.ExecuteNonQuery();
                    conn.Close();
                }
            }
            catch (Exception ex)
            {
                throw new Exception("打开数据库：" + dbPath + "的连接失败：" + ex.Message);
            }
        }
    }
}