using System.Collections.Generic;
using System.Threading.Tasks;

namespace NPP.SmartSchedue.Api.Contracts.Services.Notification;

/// <summary>
/// 通知模板服务接口
/// 决策点7：模板通知，支持通知内容模板，可替换变量
/// </summary>
public interface INotificationTemplateService
{
    #region 模板渲染
    
    /// <summary>
    /// 渲染通知模板
    /// 支持变量替换，如：{变量名}
    /// </summary>
    /// <param name="template">模板内容</param>
    /// <param name="variables">变量字典</param>
    /// <returns>渲染后的内容</returns>
    Task<string> RenderTemplateAsync(string template, Dictionary<string, string> variables);

    /// <summary>
    /// 同步渲染通知模板
    /// </summary>
    /// <param name="template">模板内容</param>
    /// <param name="variables">变量字典</param>
    /// <returns>渲染后的内容</returns>
    string RenderTemplate(string template, Dictionary<string, string> variables);

    #endregion

    #region 模板验证
    
    /// <summary>
    /// 验证模板语法是否正确
    /// </summary>
    /// <param name="template">模板内容</param>
    /// <returns>验证结果</returns>
    Task<TemplateValidationResult> ValidateTemplateAsync(string template);

    /// <summary>
    /// 同步验证模板语法
    /// </summary>
    /// <param name="template">模板内容</param>
    /// <returns>验证结果</returns>
    TemplateValidationResult ValidateTemplate(string template);

    #endregion

    #region 变量解析
    
    /// <summary>
    /// 提取模板中的变量列表
    /// </summary>
    /// <param name="template">模板内容</param>
    /// <returns>变量名列表</returns>
    Task<List<string>> ExtractVariablesAsync(string template);

    /// <summary>
    /// 同步提取模板中的变量列表
    /// </summary>
    /// <param name="template">模板内容</param>
    /// <returns>变量名列表</returns>
    List<string> ExtractVariables(string template);

    #endregion

    #region 内置变量
    
    /// <summary>
    /// 获取系统内置变量
    /// </summary>
    /// <returns>内置变量字典</returns>
    Task<Dictionary<string, string>> GetSystemVariablesAsync();

    /// <summary>
    /// 获取业务相关变量
    /// </summary>
    /// <param name="businessType">业务类型</param>
    /// <param name="businessId">业务ID</param>
    /// <param name="businessData">业务数据</param>
    /// <returns>业务变量字典</returns>
    Task<Dictionary<string, string>> GetBusinessVariablesAsync(
        string businessType,
        long? businessId = null,
        string businessData = "");

    #endregion

    #region 模板预定义
    
    /// <summary>
    /// 获取预定义模板列表
    /// </summary>
    /// <param name="category">模板分类</param>
    /// <returns>预定义模板列表</returns>
    Task<List<PredefinedTemplate>> GetPredefinedTemplatesAsync(string category = "");

    /// <summary>
    /// 获取指定预定义模板
    /// </summary>
    /// <param name="templateId">模板ID</param>
    /// <returns>预定义模板</returns>
    Task<PredefinedTemplate> GetPredefinedTemplateAsync(string templateId);

    #endregion
}

/// <summary>
/// 模板验证结果
/// </summary>
public class TemplateValidationResult
{
    /// <summary>
    /// 是否验证通过
    /// </summary>
    public bool IsValid { get; set; } = true;

    /// <summary>
    /// 错误信息列表
    /// </summary>
    public List<string> Errors { get; set; } = new List<string>();

    /// <summary>
    /// 警告信息列表
    /// </summary>
    public List<string> Warnings { get; set; } = new List<string>();

    /// <summary>
    /// 发现的变量列表
    /// </summary>
    public List<string> Variables { get; set; } = new List<string>();

    /// <summary>
    /// 添加错误信息
    /// </summary>
    /// <param name="error">错误信息</param>
    public void AddError(string error)
    {
        IsValid = false;
        Errors.Add(error);
    }

    /// <summary>
    /// 添加警告信息
    /// </summary>
    /// <param name="warning">警告信息</param>
    public void AddWarning(string warning)
    {
        Warnings.Add(warning);
    }
}

/// <summary>
/// 预定义模板
/// </summary>
public class PredefinedTemplate
{
    /// <summary>
    /// 模板ID
    /// </summary>
    public string TemplateId { get; set; } = "";

    /// <summary>
    /// 模板名称
    /// </summary>
    public string TemplateName { get; set; } = "";

    /// <summary>
    /// 模板分类
    /// </summary>
    public string Category { get; set; } = "";

    /// <summary>
    /// 模板描述
    /// </summary>
    public string Description { get; set; } = "";

    /// <summary>
    /// 邮件主题模板
    /// </summary>
    public string EmailSubjectTemplate { get; set; } = "";

    /// <summary>
    /// 邮件内容模板
    /// </summary>
    public string EmailContentTemplate { get; set; } = "";

    /// <summary>
    /// 系统消息标题模板
    /// </summary>
    public string SystemMessageTitleTemplate { get; set; } = "";

    /// <summary>
    /// 系统消息内容模板
    /// </summary>
    public string SystemMessageContentTemplate { get; set; } = "";

    /// <summary>
    /// 支持的变量列表
    /// </summary>
    public List<TemplateVariable> SupportedVariables { get; set; } = new List<TemplateVariable>();
}

/// <summary>
/// 模板变量定义
/// </summary>
public class TemplateVariable
{
    /// <summary>
    /// 变量名
    /// </summary>
    public string Name { get; set; } = "";

    /// <summary>
    /// 变量描述
    /// </summary>
    public string Description { get; set; } = "";

    /// <summary>
    /// 变量类型
    /// </summary>
    public string Type { get; set; } = "string";

    /// <summary>
    /// 是否必需
    /// </summary>
    public bool IsRequired { get; set; } = false;

    /// <summary>
    /// 默认值
    /// </summary>
    public string DefaultValue { get; set; } = "";

    /// <summary>
    /// 示例值
    /// </summary>
    public string ExampleValue { get; set; } = "";
}