using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;

namespace TeamAAS_VP.Core
{
    public static class Common
    {
        /// <summary>
        /// 解析带前导零的 IP 地址字符串
        /// </summary>
        /// <param name="ipString"></param>
        /// <returns></returns>
        /// <exception cref="FormatException"></exception>
        public static IPAddress ParseIpWithLeadingZeros(string ipString)
        {
            // 分割 IP 地址的四个部分
            string[] parts = ipString.Split('.');
            if (parts.Length != 4)
                throw new FormatException("Invalid IP address format.");

            // 处理每个部分的前导零
            for (int i = 0; i < parts.Length; i++)
            {
                string part = parts[i];
                if (string.IsNullOrEmpty(part))
                    throw new FormatException("IP part cannot be empty.");

                // 去除前导零（保留纯 "0" 的情况）
                if (part.Length > 1 && part.StartsWith("0"))
                {
                    part = part.TrimStart('0');
                    // 如果去除后为空，说明原部分全为0，补回一个0
                    if (string.IsNullOrEmpty(part))
                        part = "0";
                }

                // 验证数值范围 0-255
                if (!int.TryParse(part, out int value) || value < 0 || value > 255)
                    return null;

                parts[i] = value.ToString(); // 确保无前导零的字符串
            }

            // 重新组合为修正后的 IP 地址
            string correctedIp = string.Join(".", parts);
            return IPAddress.Parse(correctedIp);
        }

        /// <summary>
        /// 将DataTable导出到csv文件中
        /// </summary>
        /// <param name="dataTable"></param>
        /// <param name="filePath"></param>
        public static void ExportToCsv(System.Data.DataTable dataTable, string filePath)
        {
            StringBuilder sb = new StringBuilder();
            //添加列名
            foreach (System.Data.DataColumn column in dataTable.Columns)
            {
                sb.Append(column.ColumnName + ",");
            }
            sb.AppendLine();
            //添加数据
            foreach (System.Data.DataRow row in dataTable.Rows)
            {
                foreach (var item in row.ItemArray)
                {
                    sb.Append(item.ToString() + ",");
                }
                sb.AppendLine();
            }
            System.IO.File.WriteAllText(filePath, sb.ToString());
        }

        /// <summary>
        /// 计算两点之间的角度（弧度）
        /// </summary>
        /// <param name="p1"></param>
        /// <param name="p2"></param>
        /// <returns></returns>
        public static double CalculateAngleBetweenPoints(PointF p1, PointF p2)
        {
            double deltaY = p2.Y - p1.Y;
            double deltaX = p2.X - p1.X;

            // 使用 Atan2 计算角度（弧度）
            // Atan2 自动处理四个象限，返回值在 -π 到 π 之间
            double angleRad = Math.Atan2(deltaY, deltaX);

            return angleRad;
        }

        /// <summary>
        /// 计算两点之间的角度（度）
        /// </summary>
        /// <param name="p1"></param>
        /// <param name="p2"></param>
        /// <returns></returns>
        public static double CalculateAngleBetweenPointsDegrees(PointF p1, PointF p2)
        {
            double angleRad = CalculateAngleBetweenPoints(p1, p2);
            return angleRad * (180.0 / Math.PI);
        }

        /// <summary>
        /// 使用 Math 类计算两点距离
        /// </summary>
        /// <param name="x1"></param>
        /// <param name="y1"></param>
        /// <param name="x2"></param>
        /// <param name="y2"></param>
        /// <returns></returns>
        public static double CalculateDistance2D(double x1, double y1, double x2, double y2)
        {
            double dx = x2 - x1;
            double dy = y2 - y1;
            return Math.Sqrt(dx * dx + dy * dy);
        }
    }
}