using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;

namespace ServerExplorer.UI
{
    public partial class FrmProcedimientos : Form
    {
        #region Declarations

        private readonly SqlConnection _cnx;

        #endregion

        #region Form life cycle

        public FrmProcedimientos(string cnxString)
        {
            InitializeComponent();

            _cnx = new SqlConnection(cnxString);
        }

        private void frmProcedimientos_Load(object sender, EventArgs e)
        {
            LoadProcedures();
        }

        #endregion

        #region Events

        private void lsvProcs_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (lsvProcs.SelectedItems.Count <= 0) { return; }

            string name = lsvProcs.SelectedItems[0].SubItems[0].Text;
            string schema = lsvProcs.SelectedItems[0].SubItems[1].Text;
            LoadProcedure(schema, name);
        }

        private void btnRefresh_Click(object sender, EventArgs e)
        {
            LoadProcedures();
        }

        #endregion

        #region Private methods

        private void LoadProcedures()
        {
            // Obtener un datatable con todos los procedimientos de la base de datos.
            var da = new SqlDataAdapter(
                "SELECT ROUTINE_NAME Name, ROUTINE_SCHEMA [Schema], CREATED CreateDate, ROUTINE_TYPE [Type] FROM INFORMATION_SCHEMA.ROUTINES",
                _cnx);
            var dt = new DataTable();
            _cnx.Open();
            da.Fill(dt);
            _cnx.Close();

            // Mostrar todos los procedimientos
            lsvProcs.Items.Clear();
            foreach (DataRow dr in dt.Rows)
            {
                ListViewItem item = lsvProcs.Items.Add((String)dr["Name"]);
                item.SubItems.Add((string)dr["Schema"]);
                item.SubItems.Add(((DateTime)dr["CreateDate"]).ToShortDateString());
                item.SubItems.Add((string)dr["Type"]);
            }
        }

        private void LoadProcedure(string schema, string name)
        {
            SqlDataAdapter dataAdapter;
            _cnx.Open();

            if (_cnx.ServerVersion.StartsWith("10."))
            {
                dataAdapter = new SqlDataAdapter(@"
                    SELECT
                        ISNULL(smsp.definition, ssmsp.definition) AS [Definition]
                    FROM sys.all_objects AS sp
                    INNER JOIN sys.schemas sn ON sp.schema_id = sn.schema_id
                    LEFT OUTER JOIN sys.sql_modules AS smsp ON smsp.object_id = sp.object_id
                    LEFT OUTER JOIN sys.system_sql_modules AS ssmsp ON ssmsp.object_id = sp.object_id
                    WHERE
                        (sp.type = N'P' OR sp.type = N'RF' OR sp.type = N'PC' OR sp.type = N'IF' OR sp.type = N'FN' OR sp.type = N'TF')
                        AND
                        (sp.name = @name and sn.name = @schema)
                ", _cnx);
                dataAdapter.SelectCommand.Parameters.AddWithValue("@Name", name);
                dataAdapter.SelectCommand.Parameters.AddWithValue("@Schema", schema);
            }
            else
            {
                return;
            }

            var dt = new DataTable();
            dataAdapter.Fill(dt);
            _cnx.Close();

            // Mostrar el contenido del procedimiento
            txtProc.Text = String.Empty;
            foreach (DataRow dr in dt.Rows)
            {
                txtProc.Text += ((string)dr[0]).Replace("\r", "").Replace("\n", "\r\n");
            }
        }

        #endregion
    }
}