using System;
using System.Drawing;
using System.Windows.Forms;
using FastReport.Data;
using FastReport.Utils;


namespace FastReport.Forms
{
    internal partial class ReportDataForm : BaseDialogForm
    {
        private Report report;

        private bool IsBusinessObjectNode(TreeNode node)
        {
            while (node != null)
            {
                if (node.Tag is BusinessObjectDataSource)
                    return true;
                node = node.Parent;
            }
            return false;
        }

        private void UpdateNames(TreeNodeCollection root)
        {
            foreach (TreeNode node in root)
            {
                DataComponentBase data = node.Tag as DataComponentBase;
                if (data != null && !(data is DataConnectionBase))
                    node.Text = cbAliases.Checked ? data.Alias : data.Name;
                UpdateNames(node.Nodes);
            }
        }

        private void UpdateNames()
        {
            tvData.BeginUpdate();
            UpdateNames(tvData.Nodes);
            tvData.EndUpdate();
        }

        private void CheckEnabled(TreeNodeCollection root)
        {
            foreach (TreeNode node in root)
            {
                DataComponentBase data = node.Tag as DataComponentBase;
                if (data != null && !(data is DataConnectionBase))
                    data.Enabled = node.Checked;

                // do not check relation columns - they should be handled by its original datasources
                if (!(data is Relation))
                    CheckEnabled(node.Nodes);
            }
        }

        private void EnableItem(TreeNodeCollection root, DataComponentBase item)
        {
            foreach (TreeNode node in root)
            {
                DataComponentBase data = node.Tag as DataComponentBase;
                if (data == item)
                {
                    node.Checked = true;
                    break;
                }
                CheckEnabled(node.Nodes);
            }
        }

        private void ReportDataForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (DialogResult == DialogResult.OK)
                Done();
        }

        private void tvData_BeforeExpand(object sender, TreeViewCancelEventArgs e)
        {
            TreeNode node = e.Node;
            if (!node.Checked && IsBusinessObjectNode(node))
            {
                node.Checked = true;
            }
        }

        private void tvData_AfterCheck(object sender, TreeViewEventArgs e)
        {
            TreeNode node = e.Node;

            if (IsBusinessObjectNode(node))
            {
                BusinessObjectConverter conv = new BusinessObjectConverter(report.Dictionary);
                conv.CheckNode(node);
            }
            else
            {
                DataComponentBase data = node.Tag as DataComponentBase;
                if (node.Checked && data is Relation)
                    EnableItem(tvData.Nodes, (data as Relation).ParentDataSource);
            }
        }

        private void cbAliases_CheckedChanged(object sender, EventArgs e)
        {
            UpdateNames();
        }

        private void Init()
        {
            tvData.CreateNodes(report.Dictionary);
            // remove existing business objects nodes
            for (int i = 0; i < tvData.Nodes.Count; i++)
            {
                if (tvData.Nodes[i].Tag is BusinessObjectDataSource)
                {
                    tvData.Nodes.RemoveAt(i);
                    i--;
                }
            }

            // create nodes using BOConverter
            BusinessObjectConverter conv = new BusinessObjectConverter(report.Dictionary);
            foreach (DataSourceBase data in report.Dictionary.DataSources)
            {
                if (data is BusinessObjectDataSource)
                    conv.CreateTree(tvData.Nodes, data);
            }
        }

        private void Done()
        {
            CheckEnabled(tvData.Nodes);
            report.Dictionary.UpdateRelations();

            // create business objects based on tree
            BusinessObjectConverter conv = new BusinessObjectConverter(report.Dictionary);
            foreach (TreeNode node in tvData.Nodes)
            {
                if (node.Tag is BusinessObjectDataSource)
                {
                    conv.CreateDataSource(node);
                }
            }
        }

        public override void Localize()
        {
            base.Localize();
            Text = Res.Get("Forms,ReportData");
            lblHint.Text = Res.Get("Forms,ReportData,Hint");
            cbAliases.Text = Res.Get("Forms,ReportData,Aliases");
        }

        public override void UpdateDpiDependencies()
        {
            base.UpdateDpiDependencies();
            tvData.ImageList = GetImages();
            MinimumSize = this.LogicalToDevice(new Size(280, 330));
        }

        public ReportDataForm(Report report)
        {
            this.report = report;
            CanSaveRestoreState = true;
            InitializeComponent();
            Localize();
            Init();
            UIUtils.CheckRTL(this);
            UpdateDpiDependencies();
        }
    }
}