using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Globalization;

namespace FATrace.Com
{
    /// <summary>
    /// NVR 公共的类
    /// </summary>
    public class NVRCom
    {
        private static string[] SplitCodeParts(string code)
        {
            if (string.IsNullOrWhiteSpace(code)) return Array.Empty<string>();

            var normalized = code.Trim()
                .Replace('，', ',')
                .Replace('；', ',')
                .Replace(';', ',');

            // 优先使用逗号分隔，避免 SolidBeveBatch 中包含空格导致被错误切分
            if (normalized.Contains(','))
            {
                return normalized
                    .Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries)
                    .Select(p => p.Trim())
                    .ToArray();
            }

            // 无逗号时回退到按空白分隔
            return normalized
                .Split((char[]?)null, StringSplitOptions.RemoveEmptyEntries)
                .Select(p => p.Trim())
                .ToArray();
        }

        /// <summary>
        /// 获取视频名称
        /// </summary>
        /// <param name="configKey"></param>
        /// <returns></returns>
        public static string GetVideoPathName(string basePath, string Code)
        {
            // 清洗非法文件名字符，避免保存失败
            string safeCode = Code;
            try
            {
                var invalid = System.IO.Path.GetInvalidFileNameChars();
                safeCode = new string(Code.Where(c => !invalid.Contains(c)).ToArray());
                if (string.IsNullOrWhiteSpace(safeCode)) safeCode = DateTime.Now.ToString("yyyy-MM-dd HHmmss");

            }
            catch { }

            return $"{basePath}\\{safeCode}.mp4";
        }

        /// <summary>
        /// 获取视频名称
        /// </summary>
        /// <returns></returns>
        public static string GetVideoName(string Code)
        {
            string safeCode = Code;
            try
            {
                var invalid = System.IO.Path.GetInvalidFileNameChars();
                safeCode = new string(Code.Where(c => !invalid.Contains(c)).ToArray());
                if (string.IsNullOrWhiteSpace(safeCode)) safeCode = DateTime.Now.ToString("yyyy-MM-dd HHmmss");

            }
            catch { }
            return $"{safeCode}.mp4";
        }

        /// <summary>
        /// 解析条码
        /// </summary>
        /// <returns></returns>
        public static (string RawCode, string Batch, string Weight) ParseCode(string Code)
        {
            if (string.IsNullOrWhiteSpace(Code))
            {
                return (string.Empty, string.Empty, string.Empty);
            }

            try
            {
                var parts = SplitCodeParts(Code);

                // 新二维码固定 7 段：RawCode,Batch,SolidBeveBatch,Weight,ShelfLife,Region,DayCount
                if (parts.Length != 7)
                {
                    return (string.Empty, string.Empty, string.Empty);
                }

                string rawCode = parts.Length > 0 ? parts[0] : string.Empty;

                // 批号：通常为 8 位日期 yyyyMMdd；保留前 8 位数字
                string batch = string.Empty;
                if (parts.Length > 1)
                {
                    var digits = new string(parts[1].Where(char.IsDigit).ToArray());
                    if (digits.Length >= 8) batch = digits.Substring(0, 8);
                    else batch = digits; // 若不足 8 位，原样返回可供上层判定
                }

                // 重量：3/4 位数字，最后一位为小数位（例：802 => 80.2g）。
                string weight = string.Empty;
                var weightIndex = 3;
                if (parts.Length > 3)
                {
                    var digits = new string(parts[weightIndex].Where(char.IsDigit).ToArray());
                    if (digits.Length >= 2)
                    {
                        // 在最后一位前插入小数点，如 802 => 80.2，1234 => 123.4
                        weight = string.Concat(digits.AsSpan(0, digits.Length - 1), ".", digits.AsSpan(digits.Length - 1));
                    }
                    else if (digits.Length == 1)
                    {
                        weight = "0." + digits; // 兜底：1 位数字视为 0.x
                    }
                }

                return (rawCode, batch, weight);
            }
            catch
            {
                return (string.Empty, string.Empty, string.Empty);
            }
        }

        public static ParsedCodeInfo ParseCodeFull(string code)
        {
            var result = new ParsedCodeInfo();
            if (string.IsNullOrWhiteSpace(code)) return result;
            result.Code = code;

            try
            {
                var parts = SplitCodeParts(code);

                // 新二维码固定 7 段：RawCode,Batch,SolidBeveBatch,Weight,ShelfLife,Region,DayCount
                if (parts.Length != 7)
                {
                    return result;
                }

                result.RawCode = parts.Length > 0 ? parts[0] : string.Empty;

                if (parts.Length > 1)
                {
                    var digits = new string(parts[1].Where(char.IsDigit).ToArray());
                    result.Batch = digits.Length >= 8 ? digits.Substring(0, 8) : digits;
                }

                // 新二维码（7段）第3段为固体饮料批次
                result.SolidBeveBatch = parts[2];

                var weightIndex = 3;
                if (parts.Length > 3)
                {
                    var digits = new string(parts[weightIndex].Where(char.IsDigit).ToArray());
                    string weightStr = string.Empty;
                    if (digits.Length >= 2)
                    {
                        weightStr = string.Concat(digits.AsSpan(0, digits.Length - 1), ".", digits.AsSpan(digits.Length - 1));
                    }
                    else if (digits.Length == 1)
                    {
                        weightStr = "0." + digits;
                    }
                    if (!string.IsNullOrWhiteSpace(weightStr))
                    {
                        if (decimal.TryParse(weightStr, NumberStyles.Any, CultureInfo.InvariantCulture, out var w))
                            result.Weight = w;
                    }
                }

                var shelfLifeIndex = 4;
                if (parts.Length > 4)
                {
                    var digits = new string(parts[shelfLifeIndex].Where(char.IsDigit).ToArray());
                    if (int.TryParse(digits, out var m)) result.ShelfLifeMonths = m;
                }

                var regionIndex = 5;
                if (parts.Length > 5)
                {
                    var digits = new string(parts[regionIndex].Where(char.IsDigit).ToArray());
                    result.RegionCode = digits;
                    result.RegionName = digits == "01" ? "国内" : (digits == "02" ? "日本" : "未知");
                }

                var countIndex = 6;
                if (parts.Length > 6)
                {
                    var digits = new string(parts[countIndex].Where(char.IsDigit).ToArray());
                    if (int.TryParse(digits, out var c)) result.Count = c;
                }
            }
            catch { }

            return result;
        }
    }
}