using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Serilog;
using Serilog.Events;
using System;
using System.IO;

namespace AuroraDesk.Infrastructure.Extensions;

/// <summary>
/// HostBuilder 扩展方法（基础设施层）
/// 用于配置日志记录功能
/// </summary>
public static class HostBuilderExtensions
{
    /// <summary>
    /// 配置文件日志记录
    /// </summary>
    /// <param name="hostBuilder">HostBuilder</param>
    /// <returns>HostBuilder</returns>
    /// <remarks>
    /// 配置优先级说明：
    /// 1. 代码中的配置（WriteTo.Console、WriteTo.File）优先级最高，会覆盖配置文件中的相同配置
    /// 2. serilog.json 文件中的 "Serilog" 节点配置次之，会被 ReadFrom.Configuration 读取
    /// 
    /// 注意：Serilog 配置已提取到独立的 serilog.json 文件中，便于管理和维护
    /// </remarks>
    public static IHostBuilder ConfigureFileLogging(this IHostBuilder hostBuilder)
    {
        return hostBuilder.UseSerilog((context, services, configuration) =>
        {
            var environment = context.HostingEnvironment;
            
            // 配置日志目录
            var logDirectory = Path.Combine(
                Directory.GetCurrentDirectory(),
                "logs"
            );
            
            // 确保日志目录存在
            if (!Directory.Exists(logDirectory))
            {
                Directory.CreateDirectory(logDirectory);
            }
            
            // 配置 Serilog
            // 注意：ReadFrom.Configuration 会读取 serilog.json 文件中的 "Serilog" 节点
            // 然后代码中的配置会在此基础上添加或覆盖
            configuration
                .ReadFrom.Configuration(context.Configuration) // 读取 serilog.json 中的 "Serilog" 节点
                .ReadFrom.Services(services)
                .Enrich.FromLogContext()
                .Enrich.WithProperty("Environment", environment.EnvironmentName)
                // 以下代码配置会覆盖配置文件中相同类型的配置（如果存在）
                .WriteTo.Console(
                    outputTemplate: "[{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz}] [{Level:u3}] {Message:lj}{NewLine}{Exception}",
                    restrictedToMinimumLevel: LogEventLevel.Information
                )
                .WriteTo.File(
                    path: Path.Combine(logDirectory, "auroradesk-.log"),
                    rollingInterval: RollingInterval.Day,
                    retainedFileCountLimit: 30,
                    outputTemplate: "[{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz}] [{Level:u3}] [{SourceContext}] {Message:lj}{NewLine}{Exception}",
                    restrictedToMinimumLevel: LogEventLevel.Debug
                )
                .WriteTo.File(
                    path: Path.Combine(logDirectory, "auroradesk-error-.log"),
                    rollingInterval: RollingInterval.Day,
                    retainedFileCountLimit: 60,
                    outputTemplate: "[{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz}] [{Level:u3}] [{SourceContext}] {Message:lj}{NewLine}{Exception}",
                    restrictedToMinimumLevel: LogEventLevel.Error
                );
        });
    }
}