using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using CadParamPluging.Cad;

namespace CadParamPluging.UI
{
    public class LayoutSelectForm : Form
    {
        private readonly ListBox _list;
        private readonly List<LayoutAnnotation> _items;

        public LayoutAnnotation Selected { get; private set; }

        public LayoutSelectForm(IEnumerable<LayoutAnnotation> candidates)
        {
            Text = "选择图纸";
            Size = new Size(520, 360);
            StartPosition = FormStartPosition.CenterParent;
            FormBorderStyle = FormBorderStyle.FixedDialog;
            MaximizeBox = false;
            MinimizeBox = false;
            ShowInTaskbar = false;

            _items = (candidates ?? Enumerable.Empty<LayoutAnnotation>()).ToList();

            var layout = new TableLayoutPanel
            {
                Dock = DockStyle.Fill,
                Padding = new Padding(10),
                RowCount = 3,
                ColumnCount = 1
            };
            layout.RowStyles.Add(new RowStyle(SizeType.AutoSize));
            layout.RowStyles.Add(new RowStyle(SizeType.Percent, 100f));
            layout.RowStyles.Add(new RowStyle(SizeType.AutoSize));

            var lbl = new Label
            {
                Text = "匹配到多张图纸，请选择：",
                Dock = DockStyle.Fill,
                AutoSize = true
            };

            _list = new ListBox { Dock = DockStyle.Fill };
            foreach (var it in _items)
            {
                _list.Items.Add(Format(it));
            }
            if (_list.Items.Count > 0)
            {
                _list.SelectedIndex = 0;
            }

            var buttons = new FlowLayoutPanel
            {
                Dock = DockStyle.Fill,
                FlowDirection = FlowDirection.RightToLeft,
                AutoSize = true
            };

            var btnCancel = new Button { Text = "取消", DialogResult = DialogResult.Cancel };
            var btnOk = new Button { Text = "确定" };
            btnOk.Click += (_, __) => OnOk();

            buttons.Controls.Add(btnCancel);
            buttons.Controls.Add(btnOk);

            layout.Controls.Add(lbl, 0, 0);
            layout.Controls.Add(_list, 0, 1);
            layout.Controls.Add(buttons, 0, 2);
            Controls.Add(layout);

            AcceptButton = btnOk;
            CancelButton = btnCancel;
        }

        private void OnOk()
        {
            var idx = _list.SelectedIndex;
            if (idx < 0 || idx >= _items.Count)
            {
                MessageBox.Show(this, "请选择一项。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            Selected = _items[idx];
            DialogResult = DialogResult.OK;
            Close();
        }

        private static string Format(LayoutAnnotation it)
        {
            var d = it?.DeliveryStatuses != null && it.DeliveryStatuses.Count > 0 ? string.Join("/", it.DeliveryStatuses) : "(无)";
            var p = it?.ProcessMethods != null && it.ProcessMethods.Count > 0 ? string.Join("/", it.ProcessMethods) : "(无)";
            var s = it?.StructuralFeatures != null && it.StructuralFeatures.Count > 0 ? string.Join("/", it.StructuralFeatures) : "(无)";
            return $"{it?.LayoutName} | 交付状态={d} | 工艺方法={p} | 结构特征={s}";
        }

        public static bool TrySelect(IWin32Window owner, IEnumerable<LayoutAnnotation> candidates, out LayoutAnnotation selected)
        {
            using (var f = new LayoutSelectForm(candidates))
            {
                var r = f.ShowDialog(owner);
                if (r == DialogResult.OK)
                {
                    selected = f.Selected;
                    return selected != null;
                }
            }

            selected = null;
            return false;
        }
    }
}