using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using FastReport.Utils;
using FastReport.Data;
using FastReport.Design;
using FastReport.Controls;

namespace FastReport.Forms
{
    internal partial class DataWizardForm : BaseWizardForm
    {
        private Report report;
        private LastConnections connections;
        private DataConnectionBase connection;
        private bool updating;
        private bool editMode;

        #region Properties
        public DataConnectionBase Connection
        {
            get { return connection; }
            set
            {
                if (value != connection)
                {
                    if (connection != null)
                    {
                        report.Dictionary.Connections.Remove(connection);
                        connection.Clear();
                    }
                    connection = value;
                    if (value != null)
                    {
                        connections.Add(connection);
                        report.Dictionary.Connections.Add(connection);
                        UpdateConnectionsCombo();
                    }
                }
                if (value != null)
                    tbConnString.Text = value.ConnectionString;
                UpdateButtons();
            }
        }

        public bool EditMode
        {
            get { return editMode; }
            set
            {
                editMode = value;
                if (value)
                {
                    cbxConnections.Enabled = false;
                    btnNewConnection.Enabled = false;
                    tbConnName.Text = Connection.Name;
                }
            }
        }

        public override int VisiblePanelIndex
        {
            get { return base.VisiblePanelIndex; }
            set
            {
                base.VisiblePanelIndex = value;
                if (value == 1)
                    UpdateTree();
            }
        }

        private bool ApplicationConnectionMode
        {
            get { return Config.DesignerSettings.ApplicationConnection != null; }
        }
        #endregion

        #region First page
        private void cbxConnections_DrawItem(object sender, DrawItemEventArgs e)
        {
            e.DrawBackground();
            if (e.Index >= 0)
            {
                try
                {
                    DataConnectionBase connection = cbxConnections.Items[e.Index] as DataConnectionBase;
                    this.DrawImageAndText(e, null, connection.GetConnectionId());
                }
                catch
                {
                }
            }
        }

        private void btnConnString_Click(object sender, EventArgs e)
        {
            if (!tbConnString.Visible)
            {
                btnConnString.Image = GetImage(184);
                tbConnString.Visible = true;
            }
            else
            {
                btnConnString.Image = GetImage(183);
                tbConnString.Visible = false;
            }
        }

        private void UpdateConnectionsCombo()
        {
            updating = true;
            cbxConnections.Items.Clear();
            cbxConnections.Items.AddRange(connections.ToArray());
            if (cbxConnections.Items.Count > 0)
                cbxConnections.SelectedIndex = 0;
            updating = false;
        }

        private void cbxConnections_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (updating)
                return;
            updating = true;
            Connection = cbxConnections.SelectedItem as DataConnectionBase;
            updating = false;
        }

        private void btnNewConnection_Click(object sender, EventArgs e)
        {
            using (ConnectionForm form = new ConnectionForm())
            {
                if (form.ShowDialog() == DialogResult.OK)
                    Connection = form.Connection;
            }
        }

        private void btnEditConnection_Click(object sender, EventArgs e)
        {
            using (ConnectionForm form = new ConnectionForm())
            {
                form.Connection = Connection;
                form.EditMode = true;
                if (form.ShowDialog() == DialogResult.OK)
                    Connection = form.Connection;
            }
        }
        #endregion

        #region Second page
        private void CheckTableSchema(TreeNode node)
        {
            TableDataSource data = node.Tag as TableDataSource;
            if (data != null && data.Columns.Count == 0)
            {
                try
                {
                    data.InitSchema();
                }
                catch (Exception ex)
                {
                    FRMessageBox.Error(ex.Message);
                }
                finally
                {
                    node.Nodes.Clear();
                    DataTreeHelper.AddColumns(node.Nodes, data.Columns, false, true);
                }
            }
        }

        private void tvTables_BeforeExpand(object sender, TreeViewCancelEventArgs e)
        {
            CheckTableSchema(e.Node);
        }

        private void tvTables_AfterCheck(object sender, TreeViewEventArgs e)
        {
            if (updating)
                return;
            CheckTableSchema(e.Node);
        }

        private void btnAddTable_Click(object sender, EventArgs e)
        {
            TableDataSource table = new TableDataSource();
            table.Name = report.Dictionary.CreateUniqueName("Table");
            table.Alias = report.Dictionary.CreateUniqueAlias(table.Alias);
            table.Connection = Connection;
            using (QueryWizardForm form = new QueryWizardForm(table))
            {
                if (form.ShowDialog() != DialogResult.OK)
                    table.Dispose();
                else
                    UpdateTree();
            }
        }

        private void UpdateTree()
        {
            updating = true;
            tvTables.BeginUpdate();
            tvTables.Nodes.Clear();
            tvTables.Sorted = false;

            lblWait.Location = new Point(tvTables.Left + 1, tvTables.Top + tvTables.Height / 2 - 32);
            lblWait.Size = new Size(tvTables.Width - 2, 32);
            lblWait.Visible = true;
            lblWait.Refresh();
            try
            {
                connection.CreateAllTables(false);
            }
            catch
            {
            }
            lblWait.Visible = false;
            btnAddQuery.Enabled = Connection.IsSqlBased;

            DataTreeHelper.CreateDataTree(report.Dictionary, Connection, tvTables.Nodes);
            tvTables.EndUpdate();
            updating = false;
        }

        private void cbxCheckAll_CheckedChanged(object sender, EventArgs e)
        {
            foreach (TreeNode node in tvTables.Nodes)
            {
                node.Checked = cbxCheckAll.Checked;
            }
        }

        #endregion

        private void DataWizardForm_FormClosed(object sender, FormClosedEventArgs e)
        {
            Done();
            Config.SaveFormState(this);
        }

        private void UpdateButtons()
        {
            bool enabled = Connection != null;
            btnEditConnection.Enabled = enabled;
            btnNext.Enabled = enabled;
        }

        private void ReadConnections()
        {
            if (Config.DesignerSettings.CustomConnections.Count > 0)
            {
                connections.Deserialize(Config.DesignerSettings.CustomConnections);
            }
            else
            {
                XmlItem root = Config.Root.FindItem("Designer").FindItem("LastConnections");

                // read last connections
                using (FRReader reader = new FRReader(null, root))
                {
                    reader.Read(connections);
                }

                // write successfully readed connections back
                using (FRWriter writer = new FRWriter(root))
                {
                    root.Clear();
                    writer.Write(connections);
                }
            }

            if (connections.Count > 0)
                Connection = connections[0];
        }

        private void Init()
        {
            if (ApplicationConnectionMode)
            {
                if (report.Dictionary.Connections.Count == 0)
                {
                    Connection = Activator.CreateInstance(Config.DesignerSettings.ApplicationConnectionType) as DataConnectionBase;
                    Connection.Name = report.Dictionary.CreateUniqueName("Connection");
                }
                else
                    Connection = report.Dictionary.Connections[0];

                Connection.ConnectionString = Config.DesignerSettings.ApplicationConnection.ConnectionString;
                EditMode = true;
                VisiblePanelIndex = 1;
                btnPrevious.Visible = false;
                btnNext.Visible = false;
            }
            else
            {
                VisiblePanelIndex = 0;
                tbConnName.Text = report.Dictionary.CreateUniqueName("Connection");
                ReadConnections();
            }

            UpdateButtons();
        }

        private void Done()
        {
            if (DialogResult == DialogResult.OK)
            {
                Connection.Name = tbConnName.Text;

                // enable items that we have checked in the table tree
                foreach (TreeNode tableNode in tvTables.Nodes)
                {
                    TableDataSource table = tableNode.Tag as TableDataSource;
                    if (table != null)
                    {
                        table.Enabled = tableNode.Checked;

                        foreach (TreeNode colNode in tableNode.Nodes)
                        {
                            Column column = colNode.Tag as Column;
                            if (column != null)
                                column.Enabled = colNode.Checked;
                        }
                    }
                }

                // create relations if any
                Connection.CreateRelations();

                XmlItem root = Config.Root.FindItem("Designer").FindItem("LastConnections");
                using (FRWriter writer = new FRWriter(root))
                {
                    root.Clear();
                    writer.Write(connections);
                }
            }

            if (ApplicationConnectionMode)
            {
                // in this mode, we don't have to store connection string in the report
                Connection.ConnectionString = "";
            }
            if (DialogResult == DialogResult.OK || EditMode)
                connections.Remove(Connection);
            connections.Dispose();
        }

        public override void Localize()
        {
            base.Localize();
            MyRes res = new MyRes("Forms,DataWizard");
            Text = res.Get("");
            pnDatabase.Text = res.Get("Page1");
            pnTables.Text = res.Get("Page2");
            lblWhichData.Text = res.Get("WhichData");
            lblHint.Text = res.Get("Hint");
            btnNewConnection.Text = res.Get("NewConnection");
            btnEditConnection.Text = res.Get("EditConnection");
            lblConnName.Text = res.Get("ConnectionName");
            lblConnString.Text = res.Get("ConnectionString");
            lblWhichTables.Text = res.Get("WhichTables");
            lblWait.Text = res.Get("Wait");
            btnAddQuery.Text = res.Get("AddQuery");
            cbxCheckAll.Text = res.Get("CheckAll");
        }

        public override void UpdateDpiDependencies()
        {
            base.UpdateDpiDependencies();
            lblWhichData.Font = this.LogicalToDevice(new Font(DrawUtils.DefaultFont, FontStyle.Bold), true);
            tbConnString.Height = pnDatabase.Height - tbConnString.Top - 12;
            picIcon.Image = GetImage("Images.DataWizard.png");
            btnConnString.Image = GetImage(183);
            tvTables.ImageList = GetImages();
        }

        public DataWizardForm(Report report)
        {
            this.report = report;
            connections = new LastConnections();
            InitializeComponent();
            Localize();
            Init();
            Config.RestoreFormState(this);
            lblWhichData.Font = new Font(DrawUtils.DefaultFont, FontStyle.Bold);
            lblWhichTables.Font = lblWhichData.Font;

            UIUtils.CheckRTL(this);
            UpdateDpiDependencies();
        }


        private class LastConnections : IDisposable, IFRSerializable
        {
            private List<DataConnectionBase> connections;

            public DataConnectionBase this[int index]
            {
                get { return connections[index]; }
            }

            public int Count
            {
                get { return connections.Count; }
            }

            public void Serialize(FRWriter writer)
            {
                List<string> savedConnections = new List<string>();
                writer.ItemName = "LastConnections";
                foreach (DataConnectionBase connection in connections)
                {
                    if (savedConnections.IndexOf(connection.GetConnectionId()) == -1)
                    {
                        writer.SaveChildren = false;
                        writer.Write(connection);
                        savedConnections.Add(connection.GetConnectionId());
                    }
                }
            }

            public void Deserialize(FRReader reader)
            {
                while (reader.NextItem())
                {
                    try
                    {
                        DataConnectionBase connection = reader.Read() as DataConnectionBase;
                        if (connection != null)
                            connections.Add(connection);
                    }
                    catch
                    {
                    }
                }
            }

            public void Deserialize(List<ConnectionEntry> connections)
            {
                foreach (ConnectionEntry ce in connections)
                {
                    try
                    {
                        DataConnectionBase connection =
                          Activator.CreateInstance(ce.type) as DataConnectionBase;
                        connection.ConnectionString = ce.connectionString;
                        this.connections.Add(connection);
                    }
                    catch
                    {
                    }
                }
            }

            public void Add(DataConnectionBase connection)
            {
                for (int i = 0; i < connections.Count; i++)
                {
                    try
                    {
                        if (connections[i].GetConnectionId() == connection.GetConnectionId())
                        {
                            connections.RemoveAt(i);
                            break;
                        }
                    }
                    catch
                    {
                    }
                }
                connections.Insert(0, connection);
            }

            public void Remove(DataConnectionBase connection)
            {
                if (connections.Contains(connection))
                    connections.Remove(connection);
            }

            public DataConnectionBase[] ToArray()
            {
                return connections.ToArray();
            }

            public void Dispose()
            {
                foreach (DataConnectionBase connection in connections)
                {
                    connection.Dispose();
                }
                connections.Clear();
            }

            public LastConnections()
            {
                connections = new List<DataConnectionBase>();
            }
        }
    }
}