// <copyright file="ExpressionZDialog.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 ExpressionZDialog : Form
    {
        private Dictionary<string, string> descriptionMap = new Dictionary<string, string>();
        public ExpressionZDialog()
        {
            InitializeComponent();
            InitDescriptionMap();
        }

        public string GetExpression()
        {
            return expresstionTextBox.Text;
        }

        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("^", "^;\r\n格式：x^y(x的y次方)");

            descriptionMap.Add("sin()", "sin();\r\n格式：sin(表达式)");
            descriptionMap.Add("cos()", "cos()\r\n格式：cos(表达式)");
            descriptionMap.Add("int()", "int();\r\n格式：int(表达式)");
            descriptionMap.Add("tan()", "tan();\r\n格式：tan(表达式)");
            descriptionMap.Add("ctan()", "ctan();\r\n格式：ctan(表达式)");
            descriptionMap.Add("sqrt()", "sqrt()\r\n格式：sqrt(表达式)");
            descriptionMap.Add("exp()", "exp();\r\n格式：exp(表达式)");
            descriptionMap.Add("log()", "log();\r\n格式：log(表达式)");
            descriptionMap.Add("asin()", "asin();\r\n格式：asin(表达式)");
            descriptionMap.Add("acos()", "acos();\r\n格式：acos(表达式)");
            descriptionMap.Add("atan()", "atan();\r\n格式：atan(表达式)");
            descriptionMap.Add("fabs()", "fabs();\r\n格式：fabs(表达式)");

            descriptionMap.Add("<", "<;\r\n格式：x<y（x小于y时返回1，x大于或等于y时返回0）");
            descriptionMap.Add(">", ">;\r\n格式：x>y（x大于y时返回1，x小于或等于y时返回0）");
            descriptionMap.Add("!", "!;\r\n格式：!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 ExpressionZDialog_Load(object sender, EventArgs e)
        {
            functionCategoryComboBox.SelectedIndex = 0;
            AddOperatorToFunctionCategoryComboBox();
            AddFunctionToFunctionCategoryComboxBox();
            AddLogicalOperationToFunctionCategoryComboxBox();
            FillVariationListBox();
        }

        private void AddOperatorToFunctionCategoryComboBox()
        {
            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("int()");
            functionListBox.Items.Add("tan()");
            functionListBox.Items.Add("ctan()");
            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("fabs()");
        }

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

        private void functionListBox_SelectedValueChanged(object sender, EventArgs e)
        {
            string functionStr = functionListBox.SelectedItem.ToString();
            if (functionStr.Length == 0)
                return;

            if (descriptionMap.ContainsKey(functionStr) == false)
                return;

            notationTextBox.Text = descriptionMap[functionStr];
        }

        public void InsertFunctionToExpresstionTextBox(string funcStr)
        {
            int start = expresstionTextBox.SelectionStart; //插入点位置

            expresstionTextBox.Paste(funcStr);
            //ScrollToCaret();
            //expresstionTextBox.ScrollToCaret();
            //expresstionTextBox.cu
        }

        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 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_DoubleClick(object sender, EventArgs e)
        {
            string functionStr = functionListBox.SelectedItem.ToString();
            expresstionTextBox.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
            {
                expresstionTextBox.SelectionStart -= 1;
            }

            expresstionTextBox.Focus();
        }

        private void variationListBox_DoubleClick(object sender, EventArgs e)
        {
            string varStr = variationListBox.SelectedItem.ToString();
            expresstionTextBox.Paste(varStr);
            expresstionTextBox.Focus();
        }
    }
}