using System;
using XP.Common.Logging.Interfaces;
using XP.ReportEngine.Interfaces;
using XP.ReportEngine.Models;

namespace XP.ReportEngine.Services
{
    /// <summary>
    /// 报告生成器工厂实现 | Report generator factory implementation
    /// 根据输出格式创建对应的报告生成器实例
    /// Creates report generator instances based on output format
    /// </summary>
    public class ReportGeneratorFactory : IReportGeneratorFactory
    {
        private readonly ILoggerService _logger;
        private readonly IReportGenerator _pdfReportGenerator;

        /// <summary>
        /// 构造函数 | Constructor
        /// </summary>
        /// <param name="logger">日志服务 | Logger service</param>
        /// <param name="pdfReportGenerator">PDF 报告生成器 | PDF report generator</param>
        public ReportGeneratorFactory(ILoggerService logger, IReportGenerator pdfReportGenerator)
        {
            _logger = logger?.ForModule<ReportGeneratorFactory>() ?? throw new ArgumentNullException(nameof(logger));
            _pdfReportGenerator = pdfReportGenerator ?? throw new ArgumentNullException(nameof(pdfReportGenerator));
        }

        /// <summary>
        /// 根据输出格式创建生成器 | Create generator by output format
        /// 当前仅支持 PDF 格式，未来可扩展 Excel/CSV
        /// Currently only supports PDF format, extensible for Excel/CSV in the future
        /// </summary>
        /// <param name="format">输出格式 | Output format</param>
        /// <returns>对应格式的报告生成器 | Report generator for the specified format</returns>
        /// <exception cref="NotSupportedException">当请求不支持的格式时抛出 | Thrown when unsupported format is requested</exception>
        public IReportGenerator Create(ReportOutputFormat format)
        {
            _logger.Info("创建报告生成器，格式: {Format} | Creating report generator, format: {Format}", format);

            switch (format)
            {
                case ReportOutputFormat.Pdf:
                    return _pdfReportGenerator;

                default:
                    var message = $"不支持的报告输出格式: {format} | Unsupported report output format: {format}";
                    _logger.Error(null, message);
                    throw new NotSupportedException(message);
            }
        }
    }
}