// <copyright file="CalculateZDialog.cs" company="PlaceholderCompany">
// Copyright (c) PlaceholderCompany. All rights reserved.
// </copyright>

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace KepGridEditor
{
    public partial class CalculateZDialog : Form
    {
        private ToolTip tip;
        private TextBox focusedTexbox = null; //现在或最近一次拥有焦点的输入框
        private Dictionary<string, string> descriptionMap = new Dictionary<string, string>();
        public CalculateZDialog()
        {
            InitializeComponent();

            focusedTexbox = zExpressionTextBox;

            InitDescriptionMap();
            tip = new ToolTip();
            tip.AutomaticDelay = 3000;
        }

        public int GetOperationObjectKind()
        {
            return operationObjectComboBox.SelectedIndex;
        }

        public String GetXExpression()
        {
            return xExpressionTextBox.Text;
        }

        public String GetYExpression()
        {
            return yExpressionTextBox.Text;
        }

        public String GetZExpression()
        {
            return zExpressionTextBox.Text;
        }

        public string GetLExpression()
        {
            return lExpressionTextBox.Text;
        }

        private void CalculateZDialog_Load(object sender, EventArgs e)
        {
            operationObjectComboBox.SelectedIndex = 0;
            functionCategoryComboBox.SelectedIndex = 0;

            //这里先清除函数列表 因为程序在调用此函数之前 先调用了
            //functionListBox_SelectedIndexChanged函数
            //导致重复添加列表项
            //所以 在添加前 先清除列表项
            functionListBox.Items.Clear();
            variationListBox.Items.Clear();

            AddOperatorToFunctionCategoryComboBox();
            AddFunctionToFunctionCategoryComboxBox();
            AddLogicalOperationToFunctionCategoryComboxBox();
            FillVariationListBox();
        }

        private void CalculateZDialog_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode != Keys.Escape)
                return;

            DialogResult = DialogResult.Cancel;
        }

        private void InitDescriptionMap()
        {
            //descriptionMap.Add()
            descriptionMap.Add("+", "加号运算符");
            descriptionMap.Add("-", "减号运算符");
            descriptionMap.Add("*", "乘号运算符");
            descriptionMap.Add("/", "除号运算符");
            descriptionMap.Add("()","括号运算符");
            descriptionMap.Add("^", "幂运算符");    //x^y(x的y次方)
            descriptionMap.Add("%", "取余运算符");

            descriptionMap.Add("sin()", "sin(表达式)");
            descriptionMap.Add("cos()", "cos(表达式)");
            descriptionMap.Add("tan()", "tan(表达式)");
            descriptionMap.Add("sqrt()", "sqrt(表达式)");
            descriptionMap.Add("exp()", "exp(表达式)");
            descriptionMap.Add("log()", "log(表达式)");
            descriptionMap.Add("asin()", "asin(表达式)");
            descriptionMap.Add("acos()", "acos(表达式)");
            descriptionMap.Add("atan()", "atan(表达式)");
            descriptionMap.Add("abs()", "abs(表达式)");

            descriptionMap.Add("<", "x<y（x小于y时返回1，x大于或等于y时返回0）");
            descriptionMap.Add(">", "x>y（x大于y时返回1，x小于或等于y时返回0）");
            descriptionMap.Add("!", "!x（将x值取非运算，当x为非零值时返回0，x为零时返回1）");
        }

        private void AddOperatorToFunctionCategoryComboBox()
        {
            functionListBox.Items.Add("+");
            functionListBox.Items.Add("-");
            functionListBox.Items.Add("*");
            functionListBox.Items.Add("/");
            functionListBox.Items.Add("()");
            functionListBox.Items.Add("^");
            functionListBox.Items.Add("%");
        }

        private void AddFunctionToFunctionCategoryComboxBox()
        {
            functionListBox.Items.Add("sin()");
            functionListBox.Items.Add("cos()");
            functionListBox.Items.Add("tan()");
            functionListBox.Items.Add("sqrt()");
            functionListBox.Items.Add("exp()");
            functionListBox.Items.Add("log()");
            functionListBox.Items.Add("asin()");
            functionListBox.Items.Add("acos()");
            functionListBox.Items.Add("atan()");
            functionListBox.Items.Add("abs()");
        }

        private void AddLogicalOperationToFunctionCategoryComboxBox()
        {
            functionListBox.Items.Add("<");
            functionListBox.Items.Add(">");
            functionListBox.Items.Add("!");
        }

        private void FillVariationListBox()
        {
            //variationListBox.Items.Add("l");
            //variationListBox.Items.Add("Pl");
            //variationListBox.Items.Add("x");
            //variationListBox.Items.Add("y");
            variationListBox.Items.Add("z");
        }

        private void variationListBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            if(variationListBox.SelectedItem == null)
            {
                return;
            }
            string varStr = variationListBox.SelectedItem.ToString();
            focusedTexbox.Paste(varStr);
            focusedTexbox.Focus();
        }

        private void functionListBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            string functionStr = functionListBox.SelectedItem.ToString();
            focusedTexbox.Paste(functionStr);

            if (functionStr.Contains("()")) //如果是有括号的表达式 将插入点设置在括号里
            {
                focusedTexbox.SelectionStart -= 1;
            }

            focusedTexbox.Focus();
        }

        private void xExpressionTextBox_Enter(object sender, EventArgs e)
        {
            //focusedTexbox = xExpressionTextBox;
        }

        private void yExpressionTextBox_Enter(object sender, EventArgs e)
        {
            //focusedTexbox = yExpressionTextBox;
        }

        private void zExpressionTextBox_Enter(object sender, EventArgs e)
        {
            focusedTexbox = zExpressionTextBox;
        }

        private void lExpressionTextBox_Enter(object sender, EventArgs e)
        {
            //focusedTexbox = lExpressionTextBox;
        }

        private void functionListBox_DoubleClick(object sender, EventArgs e)
        {
            focusedTexbox.Focus();
        }

        private void variationListBox_DoubleClick(object sender, EventArgs e)
        {
            focusedTexbox.Focus();
        }

        private void functionCategoryComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            int index = functionCategoryComboBox.SelectedIndex;
            if (index < 0)
                return;

            functionListBox.Items.Clear();
            if (index == 0)
            {
                AddOperatorToFunctionCategoryComboBox();
                AddFunctionToFunctionCategoryComboxBox();
                AddLogicalOperationToFunctionCategoryComboxBox();
            }
            else if (index == 1)
            {
                AddOperatorToFunctionCategoryComboBox();
            }
            else if (index == 2)
            {
                AddFunctionToFunctionCategoryComboxBox();
            }
            else if (index == 3)
            {
                AddLogicalOperationToFunctionCategoryComboxBox();
            }
        }

        private void functionListBox_MouseMove(object sender, MouseEventArgs e)
        {
            int idx = functionListBox.IndexFromPoint(e.Location);// 获取鼠标所在的项索引
            if (idx == -1 || idx >= functionListBox.Items.Count)
            {
                return;
            }

            string txt = functionListBox.GetItemText(functionListBox.Items[idx]);
            if (!descriptionMap.ContainsKey(txt))
                return; ;
            string helpInfoStr = descriptionMap[txt];

            if (tip.GetToolTip(functionListBox) == helpInfoStr)
            {
                return;
            }

            tip.SetToolTip(functionListBox, helpInfoStr);

        }
    }
}