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

namespace CadParamPluging.UI
{
    public class ParamCatalogForm : Form
    {
        private readonly ListBox _list;
        private ParamCatalog _catalog;

        public ParamCatalogForm(ParamCatalog initial)
        {
            Text = "参数总表";
            Size = new Size(640, 520);
            StartPosition = FormStartPosition.CenterParent;
            FormBorderStyle = FormBorderStyle.FixedDialog;
            MaximizeBox = false;
            MinimizeBox = false;
            ShowInTaskbar = false;

            _catalog = (initial ?? ParamCatalog.CreateDefault()).Clone();
            _catalog.Normalize();

            var layout = new TableLayoutPanel
            {
                Dock = DockStyle.Fill,
                Padding = new Padding(10),
                ColumnCount = 2,
                RowCount = 2
            };
            layout.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 100f));
            layout.ColumnStyles.Add(new ColumnStyle(SizeType.AutoSize));
            layout.RowStyles.Add(new RowStyle(SizeType.Percent, 100f));
            layout.RowStyles.Add(new RowStyle(SizeType.AutoSize));

            _list = new ListBox { Dock = DockStyle.Fill };
            ReloadList();

            var actions = new FlowLayoutPanel
            {
                Dock = DockStyle.Fill,
                FlowDirection = FlowDirection.TopDown,
                WrapContents = false,
                AutoSize = true
            };

            var btnAdd = new Button { Text = "新增", AutoSize = true };
            btnAdd.Click += (_, __) => OnAdd();
            var btnEdit = new Button { Text = "修改", AutoSize = true };
            btnEdit.Click += (_, __) => OnEdit();
            var btnDelete = new Button { Text = "删除", AutoSize = true };
            btnDelete.Click += (_, __) => OnDelete();

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

            var btnPanel = new FlowLayoutPanel
            {
                Dock = DockStyle.Fill,
                FlowDirection = FlowDirection.RightToLeft,
                AutoSize = true
            };
            var btnClose = new Button { Text = "关闭", DialogResult = DialogResult.Cancel };
            var btnSave = new Button { Text = "保存" };
            btnSave.Click += (_, __) => OnSave();
            btnPanel.Controls.Add(btnClose);
            btnPanel.Controls.Add(btnSave);

            layout.Controls.Add(_list, 0, 0);
            layout.Controls.Add(actions, 1, 0);
            layout.Controls.Add(btnPanel, 0, 1);
            layout.SetColumnSpan(btnPanel, 2);

            Controls.Add(layout);
            CancelButton = btnClose;
        }

        private void ReloadList()
        {
            _list.Items.Clear();
            foreach (var it in (_catalog.Items ?? Enumerable.Empty<ParamDefinition>()).OrderBy(x => x.Order))
            {
                _list.Items.Add(Format(it));
            }
            if (_list.Items.Count > 0)
            {
                _list.SelectedIndex = 0;
            }
        }

        private static string Format(ParamDefinition def)
        {
            if (def == null)
            {
                return "(null)";
            }
            var label = string.IsNullOrWhiteSpace(def.Label) ? def.Key : def.Label;
            return $"{label} ({def.Key}) [{def.Type}]";
        }

        private ParamDefinition GetSelected()
        {
            var idx = _list.SelectedIndex;
            if (idx < 0 || _catalog.Items == null)
            {
                return null;
            }

            var ordered = _catalog.Items.OrderBy(x => x.Order).ThenBy(x => x.Key, StringComparer.OrdinalIgnoreCase).ToList();
            if (idx >= ordered.Count)
            {
                return null;
            }

            var selKey = ordered[idx].Key;
            return _catalog.FindByKey(selKey);
        }

        private void OnAdd()
        {
            using (var f = new ParamDefinitionForm("新增参数", new ParamDefinition { Type = ParamValueType.String }, isEdit: false))
            {
                if (f.ShowDialog(this) != DialogResult.OK)
                {
                    return;
                }

                var def = f.Result;
                if (_catalog.FindByKey(def.Key) != null)
                {
                    MessageBox.Show(this, $"Key 已存在：{def.Key}", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    return;
                }

                _catalog.Items.Add(def);
                _catalog.Normalize();
                ReloadList();
            }
        }

        private void OnEdit()
        {
            var selected = GetSelected();
            if (selected == null)
            {
                MessageBox.Show(this, "请先选择一项再修改。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            using (var f = new ParamDefinitionForm("修改参数", selected, isEdit: true))
            {
                if (f.ShowDialog(this) != DialogResult.OK)
                {
                    return;
                }

                var updated = f.Result;
                var existing = _catalog.FindByKey(updated.Key);
                if (existing == null)
                {
                    _catalog.Items.Add(updated);
                }
                else
                {
                    existing.Label = updated.Label;
                    existing.Type = updated.Type;
                    existing.Required = updated.Required;
                    existing.Hint = updated.Hint;
                    existing.DefaultValue = updated.DefaultValue;
                    existing.Min = updated.Min;
                    existing.Max = updated.Max;
                    existing.EnumOptions = updated.EnumOptions;
                    existing.Group = updated.Group;
                    existing.Order = updated.Order;
                    existing.Normalize();
                }

                _catalog.Normalize();
                ReloadList();
            }
        }

        private void OnDelete()
        {
            var selected = GetSelected();
            if (selected == null)
            {
                MessageBox.Show(this, "请先选择一项再删除。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            var confirm = MessageBox.Show(this, $"确认删除参数：{selected.Label} ({selected.Key})？", "删除", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
            if (confirm != DialogResult.Yes)
            {
                return;
            }

            _catalog.Items = (_catalog.Items ?? Enumerable.Empty<ParamDefinition>())
                .Where(x => !string.Equals(x.Key, selected.Key, StringComparison.OrdinalIgnoreCase))
                .ToList();
            _catalog.Normalize();
            ReloadList();
        }

        private void OnSave()
        {
            try
            {
                ParamCatalogStore.Save(_catalog);
                MessageBox.Show(this, "已保存。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show(this, $"保存失败: {ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
    }
}