using System;
using Prism.Mvvm;
using XP.Common.Logging.Interfaces;

namespace XP.Common.GeneralForm.ViewModels
{
    /// <summary>
    /// 进度条窗口 ViewModel，管理进度数据和窗口行为逻辑
    /// </summary>
    public class ProgressWindowViewModel : BindableBase
    {
        private readonly ILoggerService? _logger;
        private string _message;
        private double _progress;

        /// <summary>
        /// 窗口标题（只读）
        /// </summary>
        public string Title { get; }

        /// <summary>
        /// 提示信息文本
        /// </summary>
        public string Message
        {
            get => _message;
            set => SetProperty(ref _message, value);
        }

        /// <summary>
        /// 进度值，范围 0-100
        /// </summary>
        public double Progress
        {
            get => _progress;
            set
            {
                if (SetProperty(ref _progress, value))
                {
                    RaisePropertyChanged(nameof(ProgressText));
                }
            }
        }

        /// <summary>
        /// 百分比显示文本，由 Progress 自动计算（只读）
        /// </summary>
        public string ProgressText => $"{Math.Floor(Progress)}%";

        /// <summary>
        /// 是否允许用户关闭窗口（只读）
        /// </summary>
        public bool IsCancelable { get; }

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="title">窗口标题</param>
        /// <param name="message">提示信息</param>
        /// <param name="progress">初始进度值</param>
        /// <param name="isCancelable">是否允许取消</param>
        /// <param name="logger">日志服务（可选）</param>
        public ProgressWindowViewModel(
            string title = "操作进行中",
            string message = "请稍候...",
            double progress = 0,
            bool isCancelable = true,
            ILoggerService? logger = null)
        {
            Title = title;
            _message = message;
            _progress = progress;
            IsCancelable = isCancelable;

            // 创建模块化日志实例（logger 为 null 时静默跳过）
            _logger = logger?.ForModule<ProgressWindowViewModel>();

            // 构造时记录 Info 级别日志
            _logger?.Info("进度窗口已创建：Title={Title}, IsCancelable={IsCancelable}", Title, IsCancelable);
        }

        /// <summary>
        /// 更新进度和提示信息（唯一的外部更新入口）
        /// </summary>
        /// <param name="message">提示信息文本</param>
        /// <param name="progress">进度值，超出 [0, 100] 范围时自动修正</param>
        public void UpdateProgress(string message, double progress)
        {
            // 检查 progress 是否超出有效范围，记录 Warn 日志
            if (progress < 0 || progress > 100)
            {
                _logger?.Warn("进度值超出有效范围 [0, 100]：{Progress}，将自动修正", progress);
            }

            // 将 progress 值 Clamp 到 [0, 100] 范围
            progress = Math.Clamp(progress, 0, 100);

            // 更新属性，触发 PropertyChanged 通知
            Message = message;
            Progress = progress;
        }
    }
}