using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;

namespace CoreAgent.Domain.Entities
{
    /// <summary>
    /// 网络配置实体
    /// </summary>
    public class NetworkConfiguration : IValidatableObject
    {
        /// <summary>
        /// 配置键值
        /// </summary>
        [Required(ErrorMessage = "配置键值不能为空")]
        public string ConfigKey { get; set; }

        /// <summary>
        /// RAN配置文件路径
        /// </summary>
        [Required(ErrorMessage = "RAN配置路径不能为空")]
        public string RagConfig { get; set; }

        /// <summary>
        /// 核心网和IMS配置列表
        /// </summary>
        [Required(ErrorMessage = "核心网和IMS配置不能为空")]
        [MinLength(1, ErrorMessage = "至少需要一个核心网和IMS配置")]
        public List<CoreImsConfig> CoreOrImsConfigs { get; set; }

        /// <summary>
        /// APN配置
        /// </summary>
        [Required(ErrorMessage = "APN配置不能为空")]
        public string Apn { get; set; }

        /// <summary>
        /// 频段配置
        /// </summary>
        [Required(ErrorMessage = "频段配置不能为空")]
        [MinLength(1, ErrorMessage = "至少需要一个频段配置")]
        public List<string> Band { get; set; }

        /// <summary>
        /// 配置说明
        /// </summary>
        public string Comment { get; set; }

        /// <summary>
        /// 验证配置
        /// </summary>
        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
        {
            // 验证PLMN是否重复
            var plmnGroups = CoreOrImsConfigs.GroupBy(x => x.Plmn);
            foreach (var group in plmnGroups)
            {
                if (group.Count() > 1)
                {
                    yield return new ValidationResult($"PLMN {group.Key} 重复配置");
                }
            }

            // 验证索引是否连续
            var orderedConfigs = CoreOrImsConfigs.OrderBy(x => x.Index).ToList();
            for (int i = 0; i < orderedConfigs.Count; i++)
            {
                if (orderedConfigs[i].Index != i + 1)
                {
                    yield return new ValidationResult($"配置索引不连续，期望 {i + 1}，实际 {orderedConfigs[i].Index}");
                }
            }

            // 验证频段格式
            foreach (var band in Band)
            {
                if (!band.StartsWith("B") || !int.TryParse(band.Substring(1), out _))
                {
                    yield return new ValidationResult($"频段格式不正确: {band}，应为 B1、B2 等格式");
                }
            }
        }

        /// <summary>
        /// 获取指定PLMN的配置
        /// </summary>
        public CoreImsConfig GetConfigByPlmn(string plmn)
        {
            return CoreOrImsConfigs.FirstOrDefault(x => x.Plmn == plmn);
        }

        /// <summary>
        /// 获取指定索引的配置
        /// </summary>
        public CoreImsConfig GetConfigByIndex(int index)
        {
            return CoreOrImsConfigs.FirstOrDefault(x => x.Index == index);
        }

        /// <summary>
        /// 验证配置文件是否存在
        /// </summary>
        public bool ValidateConfigFiles()
        {
            if (!System.IO.File.Exists(RagConfig))
            {
                throw new InvalidOperationException($"RAN配置文件不存在: {RagConfig}");
            }

            foreach (var config in CoreOrImsConfigs)
            {
                if (!System.IO.File.Exists(config.CoreNetworkConfig))
                {
                    throw new InvalidOperationException($"核心网配置文件不存在: {config.CoreNetworkConfig}");
                }
                if (!System.IO.File.Exists(config.ImsConfig))
                {
                    throw new InvalidOperationException($"IMS配置文件不存在: {config.ImsConfig}");
                }
            }

            return true;
        }
    }

    /// <summary>
    /// 核心网和IMS配置实体
    /// </summary>
    public class CoreImsConfig
    {
        /// <summary>
        /// 配置索引
        /// </summary>
        [Required(ErrorMessage = "配置索引不能为空")]
        [Range(1, int.MaxValue, ErrorMessage = "配置索引必须大于0")]
        public int Index { get; set; }

        /// <summary>
        /// PLMN码
        /// </summary>
        [Required(ErrorMessage = "PLMN码不能为空")]
        [RegularExpression(@"^\d{5,6}$", ErrorMessage = "PLMN码必须是5-6位数字")]
        public string Plmn { get; set; }

        /// <summary>
        /// 核心网配置文件路径
        /// </summary>
        [Required(ErrorMessage = "核心网配置路径不能为空")]
        [RegularExpression(@"^Config/CoreNetwork/.*\.cfg$", ErrorMessage = "核心网配置路径格式不正确")]
        public string CoreNetworkConfig { get; set; }

        /// <summary>
        /// IMS配置文件路径
        /// </summary>
        [Required(ErrorMessage = "IMS配置路径不能为空")]
        [RegularExpression(@"^Config/Ims/.*\.cfg$", ErrorMessage = "IMS配置路径格式不正确")]
        public string ImsConfig { get; set; }

        /// <summary>
        /// 获取配置文件的完整路径
        /// </summary>
        public string GetFullCoreNetworkConfigPath()
        {
            return System.IO.Path.GetFullPath(CoreNetworkConfig);
        }

        /// <summary>
        /// 获取IMS配置文件的完整路径
        /// </summary>
        public string GetFullImsConfigPath()
        {
            return System.IO.Path.GetFullPath(ImsConfig);
        }
    }
}