using System;
using System.Collections.Generic;
using System.Windows.Forms;
using PDFPatcher.Common;
using PDFPatcher.Model;

namespace PDFPatcher.Functions
{
	sealed partial class EditAdjustmentForm : Form
	{
		internal static string[] FilterNames = new string[] { "字体名称", "文本尺寸", "文本位置", "页码范围", "文本内容" };
		internal static string[] FilterIDs = new string[] { "_FontNameFilter", "_FontSizeFilter", "_FontPositionFilter", "_PageRangeFilter", "_TextFilter" };

		readonly Dictionary<Type, IFilterConditionEditor> _filterEditors = new Dictionary<Type, IFilterConditionEditor>();
		internal AutoBookmarkOptions.LevelAdjustmentOption Filter { get; private set; }
		AutoBookmarkCondition.MultiCondition conditions;

		public EditAdjustmentForm() {
			InitializeComponent();
			this.OnFirstLoad(OnLoad);
		}
		public EditAdjustmentForm(AutoBookmarkOptions.LevelAdjustmentOption filter) : this() {
			int i = 0;
			foreach (var item in FilterNames) {
				_AddFilterMenuItem.DropDownItems.Add(item).Name = FilterIDs[i++];
			}
			_FilterBox.BeforeSorting += (object sender, BrightIdeasSoftware.BeforeSortingEventArgs e) => e.Canceled = true;
			_ConditionColumn.AspectGetter = (object x) => x is AutoBookmarkCondition f ? f.Description : (object)null;
			_IsInclusiveColumn.AspectGetter = (object x) => {
				if (x is AutoBookmarkCondition f) {
					return f.IsInclusive ? "包含匹配项" : "过滤匹配项";
				}
				return null;
			};
			_TypeColumn.AspectGetter = (object x) => x is AutoBookmarkCondition f ? f.Name : null;
			Filter = new AutoBookmarkOptions.LevelAdjustmentOption();
			if (filter != null) {
				Filter.AdjustmentLevel = filter.AdjustmentLevel;
				Filter.RelativeAdjustment = filter.RelativeAdjustment;
				conditions = new AutoBookmarkCondition.MultiCondition(filter.Condition);
				_FilterBox.Objects = conditions.Conditions;
			}
			if (_FilterBox.Items.Count > 0) {
				_FilterBox.SelectedIndex = 0;
			}
		}

		void OnLoad() {
			_MainToolbar.ScaleIcons(16);
			_FilterBox.ScaleColumnWidths();
		}

		void _OkButton_Click(Object source, EventArgs args) {
			DialogResult = DialogResult.OK;
			conditions = new AutoBookmarkCondition.MultiCondition();
			foreach (ListViewItem item in _FilterBox.Items) {
				conditions.Conditions.Add((AutoBookmarkCondition)_FilterBox.GetModelObject(item.Index));
			}

			Filter.Condition = conditions.Conditions.Count switch {
				1 => conditions.Conditions[0],
				0 => null,
				_ => conditions
			};
			Close();
		}

		void _CancelButton_Click(Object source, EventArgs args) {
			DialogResult = DialogResult.Cancel;
			Close();
		}

		private void _AddFilterMenuItem_DropDownItemClicked(object sender, ToolStripItemClickedEventArgs e) {
			var c = CreateCondition(e.ClickedItem.Name);
			if (c != null) {
				_FilterBox.AddObject(c);
			}
		}

		private void _FilterBox_SelectedIndexChanged(object sender, EventArgs e) {
			_EditFilterPanel.Controls.Clear();
			var o = _FilterBox.SelectedObject;
			if (o == null) {
				return;
			}
			var ed = GetFilterEditor(o as AutoBookmarkCondition);
			if (ed == null) {
				return;
			}
			_EditFilterPanel.Controls.Add(ed.EditorControl);
			ed.EditorControl.Anchor = AnchorStyles.Left | AnchorStyles.Right | AnchorStyles.Top | AnchorStyles.Bottom;
			ed.EditorControl.Left = ed.EditorControl.Top = 0;
			ed.EditorControl.Size = _EditFilterPanel.ClientSize;
		}

		internal static AutoBookmarkCondition CreateCondition(string name) {
			switch (name) {
				case "_FontNameFilter": return new AutoBookmarkCondition.FontNameCondition("SimSun", false);
				case "_FontSizeFilter": return new AutoBookmarkCondition.TextSizeCondition(0, 10);
				case "_FontPositionFilter": return new AutoBookmarkCondition.TextPositionCondition(1, -9999, 9999);
				case "_PageRangeFilter": return new AutoBookmarkCondition.PageRangeCondition();
				case "_TextFilter": return new AutoBookmarkCondition.TextCondition() { Pattern = new MatchPattern("筛选条件", false, false, false) };
				default: return null;
			}
		}

		internal static void UpdateFilter(IFilterConditionEditor filter) {
			if (filter.EditorControl?.FindForm() is EditAdjustmentForm f) {
				f._FilterBox.RefreshSelectedObjects();
			}
		}

		private IFilterConditionEditor GetFilterEditor(AutoBookmarkCondition filter) {
			var t = filter.GetType();
			if (_filterEditors.TryGetValue(t, out IFilterConditionEditor c)) {
				goto SetEditor;
				// return c;
			}
			else if (t == typeof(AutoBookmarkCondition.FontNameCondition)) {
				c = new FontNameConditionEditor();
			}
			else if (t == typeof(AutoBookmarkCondition.TextSizeCondition)) {
				c = new TextSizeConditionEditor();
			}
			else if (t == typeof(AutoBookmarkCondition.TextPositionCondition)) {
				c = new TextPositionConditionEditor();
			}
			else if (t == typeof(AutoBookmarkCondition.PageRangeCondition)) {
				c = new PageRangeConditionEditor();
			}
			else if (t == typeof(AutoBookmarkCondition.TextCondition)) {
				c = new TextConditionEditor();
			}
			else {
				Common.FormHelper.ErrorBox("无法编辑选中的筛选条件。");
				return null;
			}
		SetEditor:
			_filterEditors[t] = c;
			c.Filter = filter;
			return c;
		}

		private void _RemoveButton_Click(object sender, EventArgs e) {
			_FilterBox.RemoveObjects(_FilterBox.SelectedObjects);
		}
	}
}