using System;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Windows.Forms;
using CadParamPluging.Common;

namespace CadParamPluging.UI
{
    public class SettingsForm : Form
    {
        private readonly ListBox _lbDeliveryStatuses;
        private readonly ListBox _lbProcessMethods;
        private readonly ListBox _lbStructuralFeatures;
        private readonly ListBox _lbSpecialConditions;


        public DropdownOptions Result { get; private set; }

        public SettingsForm(DropdownOptions current)
        {
            Text = "设置";
            Size = new Size(600, 500);
            StartPosition = FormStartPosition.CenterScreen;
            FormBorderStyle = FormBorderStyle.FixedDialog;
            MaximizeBox = false;
            MinimizeBox = false;
            ShowInTaskbar = false;
            Font = SystemFonts.MessageBoxFont; // Use system font for consistent look

            var mainLayout = new TableLayoutPanel
            {
                Dock = DockStyle.Fill,
                Padding = new Padding(12),
                RowCount = 2,
                ColumnCount = 1
            };
            mainLayout.RowStyles.Add(new RowStyle(SizeType.Percent, 100f)); // Tabs
            mainLayout.RowStyles.Add(new RowStyle(SizeType.AutoSize));      // Buttons

            _lbDeliveryStatuses = new ListBox();
            _lbProcessMethods = new ListBox();
            _lbStructuralFeatures = new ListBox();
            _lbSpecialConditions = new ListBox();

            var options = (current ?? DropdownOptions.CreateDefault()).Clone();
            options.Normalize();

            FillList(_lbDeliveryStatuses, options.DeliveryStatuses);
            FillList(_lbProcessMethods, options.ProcessMethods);
            FillList(_lbStructuralFeatures, options.StructuralFeatures);
            FillList(_lbSpecialConditions, options.SpecialConditions);



            // 2. Tabs Section
            var tabs = new TabControl { Dock = DockStyle.Fill };
            tabs.TabPages.Add(BuildEditableTab("交付状态", _lbDeliveryStatuses));
            tabs.TabPages.Add(BuildEditableTab("工艺方法", _lbProcessMethods));
            tabs.TabPages.Add(BuildEditableTab("结构特征", _lbStructuralFeatures));
            tabs.TabPages.Add(BuildEditableTab("特殊条件", _lbSpecialConditions));

            // 3. Bottom Section (Separated into Left (Tools) and Right (Dialog))
            var bottomGrid = new TableLayoutPanel 
            { 
                Dock = DockStyle.Fill, 
                RowCount = 1, 
                ColumnCount = 2, 
                AutoSize = true,
                Margin = new Padding(0, 8, 0, 0) // Top margin for spacing
            };
            bottomGrid.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 100f));
            bottomGrid.ColumnStyles.Add(new ColumnStyle(SizeType.AutoSize));

            // Left tools
            var leftTools = new FlowLayoutPanel 
            { 
                Dock = DockStyle.Fill, 
                AutoSize = true, 
                FlowDirection = FlowDirection.LeftToRight 
            };
            var btnParamCatalog = new Button { Text = "参数总表", AutoSize = true };
            btnParamCatalog.Click += (_, __) => OnOpenParamCatalog();
            
            var btnTemplateBinding = new Button { Text = "模板绑定", AutoSize = true };
            btnTemplateBinding.Click += (_, __) => OnOpenTemplateBinding();

            leftTools.Controls.Add(btnParamCatalog);
            leftTools.Controls.Add(btnTemplateBinding);

            // Right actions
            var rightActions = new FlowLayoutPanel
            {
                Dock = DockStyle.Fill,
                AutoSize = true,
                FlowDirection = FlowDirection.RightToLeft
            };
            var btnCancel = new Button { Text = "取消", DialogResult = DialogResult.Cancel, Width = 80 };
            var btnOk = new Button { Text = "确定", Width = 80 };
            btnOk.Click += (_, __) => OnOk();

            rightActions.Controls.Add(btnCancel); // Add in reverse order due to RightToLeft flow
            rightActions.Controls.Add(btnOk);

            bottomGrid.Controls.Add(leftTools, 0, 0);
            bottomGrid.Controls.Add(rightActions, 1, 0);

            // Assemble Main
            mainLayout.Controls.Add(tabs, 0, 0);
            mainLayout.Controls.Add(bottomGrid, 0, 1);

            Controls.Add(mainLayout);

            AcceptButton = btnOk;
            CancelButton = btnCancel;
        }



        private void OnOpenParamCatalog()
        {
            try
            {
                var catalog = ParamCatalogStore.Load();
                using (var f = new ParamCatalogForm(catalog))
                {
                    f.ShowDialog(this);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(this, $"打开参数总表失败: {ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void OnOpenTemplateBinding()
        {
            try
            {
                var catalog = ParamCatalogStore.Load();

                var projectTypes = _lbDeliveryStatuses.Items.Cast<object>().Select(o => (o as string) ?? string.Empty).ToList();
                var drawingTypes = _lbProcessMethods.Items.Cast<object>().Select(o => (o as string) ?? string.Empty).ToList();
                var sheetSizes = _lbStructuralFeatures.Items.Cast<object>().Select(o => (o as string) ?? string.Empty).ToList();
                var scales = _lbSpecialConditions.Items.Cast<object>().Select(o => (o as string) ?? string.Empty).ToList();

                using (var f = new TemplateSchemaBindingForm(projectTypes, drawingTypes, sheetSizes, scales, catalog))
                {
                    f.ShowDialog(this);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(this, $"打开模板参数绑定失败:\n\n{ex}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private static void FillList(ListBox listBox, System.Collections.Generic.IEnumerable<string> items)
        {
            listBox.Items.Clear();
            if (items == null)
            {
                return;
            }

            foreach (var item in items)
            {
                if (!string.IsNullOrWhiteSpace(item))
                {
                    listBox.Items.Add(item.Trim());
                }
            }

            if (listBox.Items.Count > 0)
            {
                listBox.SelectedIndex = 0;
            }
        }

        private TabPage BuildEditableTab(string title, ListBox listBox)
        {
            var page = new TabPage(title);
            page.Padding = new Padding(8);
            page.UseVisualStyleBackColor = true;

            var layout = new TableLayoutPanel
            {
                Dock = DockStyle.Fill,
                ColumnCount = 2,
                RowCount = 1,
            };
            layout.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 100f));
            layout.ColumnStyles.Add(new ColumnStyle(SizeType.Absolute, 100f)); // Fixed width for button column

            listBox.Dock = DockStyle.Fill;
            listBox.IntegralHeight = false; // smoother resizing

            var actions = new FlowLayoutPanel
            {
                Dock = DockStyle.Fill,
                FlowDirection = FlowDirection.TopDown,
                WrapContents = false,
                Padding = new Padding(4, 0, 0, 0)
            };

            var btnAdd = new Button { Text = "新增", Width = 90, Height = 30 };
            btnAdd.Click += (_, __) => OnAddItem(title, listBox);

            var btnEdit = new Button { Text = "修改", Width = 90, Height = 30 };
            btnEdit.Click += (_, __) => OnEditItem(title, listBox);

            var btnDelete = new Button { Text = "删除", Width = 90, Height = 30 };
            btnDelete.Click += (_, __) => OnDeleteItem(title, listBox);

            actions.Controls.Add(btnAdd);
            actions.Controls.Add(btnEdit);
            actions.Controls.Add(btnDelete);

            layout.Controls.Add(listBox, 0, 0);
            layout.Controls.Add(actions, 1, 0);
            page.Controls.Add(layout);
            return page;
        }

        private void OnAddItem(string category, ListBox listBox)
        {
            if (!TextInputForm.TryGetValue(this, $"{category} - 新增", "请输入内容：", string.Empty, out var value))
            {
                return;
            }

            value = (value ?? string.Empty).Trim();
            if (value.Length == 0)
            {
                MessageBox.Show(this, "内容不能为空。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }

            listBox.Items.Add(value);
            listBox.SelectedIndex = listBox.Items.Count - 1;
        }

        private void OnEditItem(string category, ListBox listBox)
        {
            var selected = listBox.SelectedItem as string;
            if (string.IsNullOrWhiteSpace(selected))
            {
                MessageBox.Show(this, "请先选择一项再修改。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            if (!TextInputForm.TryGetValue(this, $"{category} - 修改", "请输入内容：", selected, out var value))
            {
                return;
            }

            value = (value ?? string.Empty).Trim();
            if (value.Length == 0)
            {
                MessageBox.Show(this, "内容不能为空。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }

            var idx = listBox.SelectedIndex;
            listBox.Items[idx] = value;
            listBox.SelectedIndex = idx;
        }

        private void OnDeleteItem(string category, ListBox listBox)
        {
            var selected = listBox.SelectedItem as string;
            if (string.IsNullOrWhiteSpace(selected))
            {
                MessageBox.Show(this, "请先选择一项再删除。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            var confirm = MessageBox.Show(
                this,
                $"确认删除：{selected}？",
                $"{category} - 删除",
                MessageBoxButtons.YesNo,
                MessageBoxIcon.Warning);

            if (confirm != DialogResult.Yes)
            {
                return;
            }

            var idx = listBox.SelectedIndex;
            listBox.Items.RemoveAt(idx);
            if (listBox.Items.Count > 0)
            {
                listBox.SelectedIndex = Math.Min(idx, listBox.Items.Count - 1);
            }
        }

        private void OnOk()
        {
            var result = new DropdownOptions
            {
                DeliveryStatuses = _lbDeliveryStatuses.Items.Cast<object>().Select(o => (o as string) ?? string.Empty).ToList(),
                ProcessMethods = _lbProcessMethods.Items.Cast<object>().Select(o => (o as string) ?? string.Empty).ToList(),
                StructuralFeatures = _lbStructuralFeatures.Items.Cast<object>().Select(o => (o as string) ?? string.Empty).ToList(),
                SpecialConditions = _lbSpecialConditions.Items.Cast<object>().Select(o => (o as string) ?? string.Empty).ToList()
            };

            result.Normalize();

            var err = ValidateResult(result);
            if (err != null)
            {
                MessageBox.Show(this, err, "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }

            Result = result;
            DialogResult = DialogResult.OK;
            Close();
        }

        private static string ValidateResult(DropdownOptions options)
        {
            if (options.DeliveryStatuses == null || options.DeliveryStatuses.Count == 0)
            {
                return "交付状态至少需要 1 项。";
            }

            if (options.ProcessMethods == null || options.ProcessMethods.Count == 0)
            {
                return "工艺方法至少需要 1 项。";
            }

            if (options.StructuralFeatures == null || options.StructuralFeatures.Count == 0)
            {
                return "结构特征至少需要 1 项。";
            }

            if (options.SpecialConditions == null || options.SpecialConditions.Count == 0)
            {
                return "特殊条件至少需要 1 项。";
            }

            return null;
        }
    }
}