using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using DCIT.Core.Models;

namespace DCIT.App.Forms
{
    public sealed class AutoExtractPreviewForm : Form
    {
        private readonly BindingList<ExtractionCandidate> _items;
        private readonly DataGridView _grid;

        public AutoExtractPreviewForm(IList<ExtractionCandidate> candidates)
        {
            Text = "自动提取预览";
            StartPosition = FormStartPosition.CenterParent;
            MinimumSize = new Size(980, 540);
            Width = 1200;
            Height = 720;

            _items = new BindingList<ExtractionCandidate>(candidates.ToList());
            _grid = new DataGridView
            {
                Dock = DockStyle.Fill,
                AllowUserToAddRows = false,
                AllowUserToDeleteRows = false,
                AutoGenerateColumns = false,
                MultiSelect = true,
                SelectionMode = DataGridViewSelectionMode.FullRowSelect,
                DataSource = _items,
            };

            _grid.Columns.Add(new DataGridViewCheckBoxColumn
            {
                DataPropertyName = nameof(ExtractionCandidate.Append),
                HeaderText = "追加",
                Width = 60,
            });
            _grid.Columns.Add(new DataGridViewTextBoxColumn
            {
                DataPropertyName = nameof(ExtractionCandidate.CategoryDisplay),
                HeaderText = "提取类型",
                Width = 180,
                ReadOnly = true,
            });
            _grid.Columns.Add(new DataGridViewTextBoxColumn
            {
                DataPropertyName = nameof(ExtractionCandidate.OriginalText),
                HeaderText = "原文本",
                Width = 260,
                ReadOnly = true,
            });
            _grid.Columns.Add(new DataGridViewTextBoxColumn
            {
                DataPropertyName = nameof(ExtractionCandidate.StatisticDisplay),
                HeaderText = "统计值",
                Width = 180,
                ReadOnly = true,
            });
            _grid.Columns.Add(new DataGridViewTextBoxColumn
            {
                DataPropertyName = nameof(ExtractionCandidate.FirstDocumentPath),
                HeaderText = "首次出现文档",
                Width = 360,
                ReadOnly = true,
            });
            _grid.Columns.Add(new DataGridViewTextBoxColumn
            {
                DataPropertyName = nameof(ExtractionCandidate.FirstOccurrenceOrder),
                HeaderText = "首次出现顺序",
                Width = 120,
                ReadOnly = true,
            });

            var buttonPanel = new FlowLayoutPanel
            {
                Dock = DockStyle.Bottom,
                Height = 44,
                Padding = new Padding(8),
                FlowDirection = FlowDirection.RightToLeft,
            };

            var confirmButton = new Button
            {
                Text = "追加选中项",
                AutoSize = true,
            };
            confirmButton.Click += ConfirmButton_Click;

            var cancelButton = new Button
            {
                Text = "取消",
                AutoSize = true,
            };
            cancelButton.Click += delegate
            {
                DialogResult = DialogResult.Cancel;
                Close();
            };

            var selectAllButton = new Button
            {
                Text = "全选",
                AutoSize = true,
            };
            selectAllButton.Click += delegate
            {
                foreach (var item in _items)
                {
                    item.Append = true;
                }

                _grid.Refresh();
            };

            var clearButton = new Button
            {
                Text = "全不选",
                AutoSize = true,
            };
            clearButton.Click += delegate
            {
                foreach (var item in _items)
                {
                    item.Append = false;
                }

                _grid.Refresh();
            };

            buttonPanel.Controls.Add(confirmButton);
            buttonPanel.Controls.Add(cancelButton);
            buttonPanel.Controls.Add(clearButton);
            buttonPanel.Controls.Add(selectAllButton);

            Controls.Add(_grid);
            Controls.Add(buttonPanel);
        }

        public IList<ExtractionCandidate> SelectedCandidates
        {
            get { return _items.Where(item => item.Append).ToList(); }
        }

        private void ConfirmButton_Click(object sender, EventArgs e)
        {
            DialogResult = DialogResult.OK;
            Close();
        }
    }
}