using Microsoft.Data.Sqlite;
using System.ComponentModel;
using trakker.Data;
using trakker.Forms;
using trakker.Interfaces;
using trakker.Models;
using trakker.Services;

namespace trakker
{
    public partial class MainForm : Form, IMainForm
    {
        //private readonly string _dbversion = "[N.N.N]";
        private string connectionString = string.Empty;
        readonly MainCtrl _ctrl;


        /// <summary>
        /// Initializes a new instance of the <see cref="MainForm"/> class.
        /// Sets up the form's controls and event handlers by calling
        /// <see cref="InitializeComponent"/> which is generated by the designer.
        /// </summary>
        public MainForm()
        {
            InitializeComponent();

            // build connection string that will be used for database connections
            // ------------------------------------------------------------------------ 
            var dbPath = Path.Combine(AppContext.BaseDirectory, "trakker.db");
            connectionString = new SqliteConnectionStringBuilder
            {
                DataSource = dbPath,
                Mode = SqliteOpenMode.ReadWriteCreate,
                Cache = SqliteCacheMode.Shared
            }.ToString();

            tabControlMainForm.TabPages[0].Text = "      Home      ";
            tabControlMainForm.TabPages[1].Text = "    Clients     ";
            tabControlMainForm.TabPages[2].Text = "    Projects    ";
            tabControlMainForm.TabPages[3].Text = "      Tasks     ";

            _ctrl = new Services.MainCtrl(this, connectionString);
        }

        /// <summary>
        /// Handles the Click event of the Exit menu item. When invoked, this
        /// method terminates the application.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">Event data associated with the click event.</param>
        private void MainForm_Exit_MenuItem_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        public void InitDataGridViewClients(BindingList<Client> clients)
        {
            dataGridViewClients.AllowUserToAddRows = true;
            dataGridViewClients.AllowUserToDeleteRows = true;
            dataGridViewClients.AutoGenerateColumns = false;
            dataGridViewClients.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
            dataGridViewClients.BackgroundColor = Color.White;
            dataGridViewClients.ColumnHeadersVisible = true;
            dataGridViewClients.DataSource = clients;
            dataGridViewClients.MultiSelect = false;
            dataGridViewClients.RowHeadersVisible = false;
            dataGridViewClients.SelectionMode = DataGridViewSelectionMode.FullRowSelect;

            dataGridViewClients.Columns.Clear();
            {
                var textColumn = new DataGridViewTextBoxColumn
                {
                    AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill,
                    DataPropertyName = "Name",
                    Name = "Name",
                    Visible = true,
                };
                dataGridViewClients.Columns.Add(textColumn);
            }
            {
                var textColumn = new DataGridViewTextBoxColumn
                {
                    AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill,
                    DataPropertyName = "Company",
                    Name = "Company",
                    Visible = true,
                };
                dataGridViewClients.Columns.Add(textColumn);
            }
            {
                var textColumn = new DataGridViewTextBoxColumn
                {
                    AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill,
                    DataPropertyName = "Email",
                    Name = "Email",
                    Visible = true,
                };
                dataGridViewClients.Columns.Add(textColumn);
            }
            {
                var textColumn = new DataGridViewTextBoxColumn
                {
                    AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill,
                    DataPropertyName = "Phone",
                    Name = "Phone",
                    Visible = true,
                };
                dataGridViewClients.Columns.Add(textColumn);
            }

            dataGridViewClients.DoubleClick += (s, e) =>
            {
                if (dataGridViewClients.SelectedRows.Count > 0)
                {
                    var selectedClient = dataGridViewClients.SelectedRows[0].DataBoundItem as Client;
                    if (selectedClient != null)
                    {
                        var dialog = new ClientForm(selectedClient, _ctrl.GetLOV("state"));
                        if (dialog.ShowDialog(this) == DialogResult.OK)
                        {
                            Client client = dialog.Client;
                            ClientData clientData = new ClientData(connectionString);
                            try
                            {
                                clientData.Upsert(client);
                                dataGridViewClients.Refresh(); // Refresh the DataGridView to reflect changes
                            }
                            catch (Exception ex)
                            {
                                MessageBox.Show($"Error saving client: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                            }
                        }
                    }
                }
            };

            dataGridViewClients.SelectionChanged += (s, e) =>
            {
                if (dataGridViewClients.SelectedRows.Count > 0)
                {
                    var selectedClient = dataGridViewClients.SelectedRows[0].DataBoundItem as Client;
                    if (selectedClient != null)
                    {
                        // Handle the selected client as needed
                        // MessageBox.Show($"Selected Client: {selectedClient.AddressStreet}", "Client Selected", MessageBoxButtons.OK, MessageBoxIcon.Information  );
                    }
                }
            };

        }
        public void FillDataGridViewProjects(BindingSource projects)
        {
            dataGridViewProjects.DataSource = projects;
        }
        public void InitDataGridViewProjects()
        {
            dataGridViewProjects.AllowUserToAddRows = true;
            dataGridViewProjects.AllowUserToDeleteRows = true;
            dataGridViewProjects.AutoGenerateColumns = false;
            dataGridViewProjects.BackgroundColor = Color.White;
            dataGridViewProjects.ColumnHeadersVisible = true;
            dataGridViewProjects.MultiSelect = false;
            dataGridViewProjects.RowHeadersVisible = false;
            dataGridViewProjects.SelectionMode = DataGridViewSelectionMode.FullRowSelect;

            dataGridViewProjects.Columns.Clear();
            {
                var textColumn = new DataGridViewTextBoxColumn
                {
                    AutoSizeMode = DataGridViewAutoSizeColumnMode.None,
                    DataPropertyName = "ProjectName",
                    Name = "Project Name",
                    Visible = true,
                    Width = 350,
                };
                dataGridViewProjects.Columns.Add(textColumn);
            }
            {
                var textColumn = new DataGridViewTextBoxColumn
                {
                    AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill,
                    DataPropertyName = "ClientName",
                    Name = "Client Name",
                    Visible = true,
                };
                dataGridViewProjects.Columns.Add(textColumn);
            }
            {
                var textColumn = new DataGridViewTextBoxColumn
                {
                    AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill,
                    DataPropertyName = "StartDate",
                    DefaultCellStyle = { Format = "MM/dd/yyyy" },
                    Name = "Start Date",
                    Visible = true,
                };
                dataGridViewProjects.Columns.Add(textColumn);
            }
            {
                var textColumn = new DataGridViewTextBoxColumn
                {
                    AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill,
                    DataPropertyName = "EndDate",
                    DefaultCellStyle = { Format = "MM/dd/yyyy" },
                    Name = "End Date",
                    Visible = true,
                };
                dataGridViewProjects.Columns.Add(textColumn);
            }
            {
                var textColumn = new DataGridViewTextBoxColumn
                {
                    AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill,
                    DataPropertyName = "HourlyRate",
                    Name = "Hourly Rate",
                    Visible = true,
                };
                textColumn.DefaultCellStyle.Format = "$#,##0.00";
                textColumn.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight;
                textColumn.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleRight;
                dataGridViewProjects.Columns.Add(textColumn);
            }
            {
                var textColumn = new DataGridViewTextBoxColumn
                {
                    AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill,
                    DataPropertyName = "Budget",
                    Name = "Budget",
                    Visible = true,
                };
                textColumn.DefaultCellStyle.Format = "$#,##0.00";
                textColumn.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight;
                textColumn.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleRight;
                dataGridViewProjects.Columns.Add(textColumn);
            }
            {
                var textColumn = new DataGridViewTextBoxColumn
                {
                    AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill,
                    DataPropertyName = "StatusName",
                    Name = "Status",
                    Visible = true,
                };
                dataGridViewProjects.Columns.Add(textColumn);
            }

            dataGridViewProjects.DoubleClick += (s, e) =>
            {
                if (dataGridViewProjects.SelectedRows.Count > 0)
                {
                    var selectedIdx = dataGridViewProjects.SelectedRows[0].Index;
                    var selectedProject = dataGridViewProjects.SelectedRows[0].DataBoundItem as Project;
                    if (selectedProject != null)
                    {
                        var dialog = new ProjectForm(selectedProject, _ctrl.GetClients(), _ctrl.GetLOV("project.status"));
                        if (dialog.ShowDialog(this) == DialogResult.OK)
                        {
                            Project project = dialog.Project;
                            ProjectData projectData = new ProjectData(connectionString);
                            try
                            {
                                projectData.Upsert(project);
                                _ctrl.LoadProjects(); // Reload projects to update the DataGridView with any changes
                                dataGridViewProjects.ClearSelection();
                                if (selectedIdx >= 0 && selectedIdx < dataGridViewProjects.Rows.Count)
                                {
                                    dataGridViewProjects.Rows[selectedIdx].Selected = true;
                                }
                            }
                            catch (Exception ex)
                            {
                                MessageBox.Show($"Error saving project: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                            }
                        }
                        return;
                    }
                }
            };

            dataGridViewClients.SelectionChanged += (s, e) =>
            {
                if (dataGridViewClients.SelectedRows.Count > 0)
                {
                    var selectedClient = dataGridViewClients.SelectedRows[0].DataBoundItem as Client;
                    if (selectedClient != null)
                    {
                        // Handle the selected client as needed
                        // MessageBox.Show($"Selected Client: {selectedClient.AddressStreet}", "Client Selected", MessageBoxButtons.OK, MessageBoxIcon.Information  );
                    }
                }
            };

        }
        public void FillTreeViewTasks(List<TaskFS> items)
        {
            if (items == null) return;

            treeViewTasks1.BeginUpdate();  // Improves performance for large trees
            treeViewTasks1.Nodes.Clear();

            // Root node
            TaskFS root = new();
            root.GUID = "/";
            root.Node = "/Projects";
            root.Parent = string.Empty;
            TreeNode rootNode = new TreeNode(root.Node) { Tag = root };
            treeViewTasks1.Nodes.Add(rootNode);

            // Normalize keys so null/empty parents map to root key "/"
            static string NormalizeKey(string? k) => string.IsNullOrWhiteSpace(k) ? "/" : k!.Trim();

            // Build lookup: parentKey -> list of children
            var lookup = new Dictionary<string, List<TaskFS>>();
            foreach (var it in items)
            {
                var key = NormalizeKey(it.Parent);
                if (!lookup.TryGetValue(key, out var list))
                {
                    list = new List<TaskFS>();
                    lookup[key] = list;
                }
                list.Add(it);
            }

            var keys = lookup.Keys.ToList();
            // Recursive adder: attach child nodes to a parent TreeNode.
            // Uses normalized keys so null/empty parents become "/".
            void AddChildren(TreeNode parentNode, string parentKey)
            {
                if (!lookup.TryGetValue(parentKey, out var children)) return;
                // Optional: sort children by Node text for deterministic order
                foreach (var child in children.OrderBy(c => c.Node))
                {
                    var text = string.IsNullOrWhiteSpace(child.Node) ? "(unnamed)" : child.Node!.Trim();
                    var tn = new TreeNode(text) { Tag = child };
                    //tn.Expand();
                    parentNode.Nodes.Add(tn);

                    // Recurse using this child's node text as the parent key
                    AddChildren(tn, NormalizeKey(child.GUID));
                }
            }

            // // Start recursion from root key
            AddChildren(rootNode, "/");

            //rootNode.ExpandAll();
            rootNode.Expand(); // Expand first level for better UX
            treeViewTasks1.EndUpdate();  // End the update
        }

        private void addTaskSubtaskToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (treeViewTasks1.SelectedNode == null) return;
            TaskFS? selectedNode = (TaskFS?)treeViewTasks1.SelectedNode.Tag ?? new TaskFS();
            if (selectedNode?.Parent == "")
            {
                MessageBox.Show("Cannot add tasks to root node", "Add Task", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            string taskId = Guid.NewGuid().ToString();
            trakker.Models.Task task = new()
            {
                TaskId = taskId,
                Title = "New Task",
                Description = string.Empty,
                ParentTaskId = selectedNode?.GUID == "/" ? null : selectedNode?.GUID,
                HourlyRate = selectedNode?.HourlyRate,
                ProjectId = selectedNode?.ProjectId, // Root node has no project
            };
            TaskForm dialog = new TaskForm(task, _ctrl.GetLOV("task.status"), _ctrl.GetLOV("task.priority"));
            DialogResult result = dialog.ShowDialog(this);
            if (result == DialogResult.OK)
            {
                task = dialog.Task;
                //MessageBox.Show(task.ToString(), "Task Details", MessageBoxButtons.OK, MessageBoxIcon.Information);
                TaskData taskData = new TaskData(connectionString);
                try
                {
                    taskData.Upsert(task);
                    _ctrl.LoadTasks(); // Reload tasks to update the DataGridView with any changes
                }
                catch (Exception ex)
                {
                    MessageBox.Show($"Error saving task: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        private void editThisTaskSubtaskToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (treeViewTasks1.SelectedNode == null) return;
            TaskFS? selectedTask = treeViewTasks1.SelectedNode.Tag as TaskFS;
            //MessageBox.Show(selectedTask != null ? selectedTask.ToString() : "No task selected", "Edit Task", MessageBoxButtons.OK, MessageBoxIcon.Information);
            if (selectedTask?.Parent == "/" || selectedTask?.GUID == "/")
            {
                MessageBox.Show("Cannot edit root node", "Edit Task", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            TaskData taskData = new TaskData(connectionString);
            trakker.Models.Task task = taskData.Get(selectedTask?.GUID);
            TaskForm dialog = new TaskForm(task, _ctrl.GetLOV("task.status"), _ctrl.GetLOV("task.priority"));
            DialogResult result = dialog.ShowDialog(this);
            if (result == DialogResult.OK)
            {
                task = dialog.Task;
                //MessageBox.Show(task.ToString(), "Task Details", MessageBoxButtons.OK, MessageBoxIcon.Information);
                try
                {
                    taskData.Upsert(task);
                    _ctrl.LoadTasks(); // Reload tasks to update the DataGridView with any changes
                }
                catch (Exception ex)
                {
                    MessageBox.Show($"Error saving task: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        private void deleteThisTaskSubtaskToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (treeViewTasks1.SelectedNode == null) return;
            TaskFS? selectedTask = treeViewTasks1.SelectedNode.Tag as TaskFS;
            //MessageBox.Show(selectedTask != null ? selectedTask.ToString() : "No task selected", "Edit Task", MessageBoxButtons.OK, MessageBoxIcon.Information);
            if (selectedTask?.Parent == "/" || selectedTask?.GUID == "/")
            {
                MessageBox.Show("Cannot delete root node", "Delete Task", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            if (treeViewTasks1.SelectedNode.Nodes.Count > 0)
            {
                MessageBox.Show("Cannot delete a task with subtasks", "Delete Task", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            TaskData taskData = new TaskData(connectionString);
            DialogResult result = MessageBox.Show("Are you sure you want to delete this task?", "Delete Task", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
            if (result == DialogResult.Yes)
            {
                //MessageBox.Show(task.ToString(), "Task Details", MessageBoxButtons.OK, MessageBoxIcon.Information);
                try
                {
                    taskData.Delete(selectedTask?.GUID ?? string.Empty);
                    treeViewTasks1.SelectedNode.Remove();
                    //_ctrl.LoadTasks(); // Reload tasks to update the DataGridView with any changes
                }
                catch (Exception ex)
                {
                    MessageBox.Show($"Error deleting task: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        private void addACommentToolStripMenuItem_Click(object sender, EventArgs e)
        {

        }


        //private void button1_Click(object sender, EventArgs e)
        //{
        //    var dialog = new ClientForm(new Client());
        //    if (dialog.ShowDialog(this) == DialogResult.OK)
        //    {
        //        Client client = dialog.Client;
        //        ClientData clientData = new ClientData(connectionString);
        //        try
        //        {
        //            clientData.Upsert(client);
        //        }
        //        catch (Exception ex)
        //        {
        //            MessageBox.Show($"Error saving client: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        //        }
        //    }
        //}
    }
}