using CommunityToolkit.Mvvm.ComponentModel;
using FluidExplorer.Models;
using FluidExplorer.Services.Operations;

namespace FluidExplorer.ViewModels;

/// <summary>
/// 操作队列面板里的一行。作业对象是在后台线程上更新并抛 PropertyChanged 的，
/// 直接绑定会跨线程更新 UI 而崩溃，因此这里在 UI 线程维护一份快照，由定时器按 250ms 刷新。
/// </summary>
public sealed partial class JobRowViewModel : ObservableObject
{
    [ObservableProperty] private string _title = string.Empty;
    [ObservableProperty] private string _stateText = string.Empty;
    [ObservableProperty] private string _progressText = string.Empty;
    [ObservableProperty] private string _currentItem = string.Empty;
    [ObservableProperty] private double _progress;
    [ObservableProperty] private bool _isIndeterminate;
    [ObservableProperty] private bool _canPause;
    [ObservableProperty] private bool _canCancel;
    [ObservableProperty] private bool _isFinished;
    [ObservableProperty] private string _pauseGlyph = "\uE769";

    public JobRowViewModel(FileOperationJob job)
    {
        Job = job;
        Refresh();
    }

    public FileOperationJob Job { get; }

    public void Refresh()
    {
        Title = Job.Title;
        StateText = Job.State switch
        {
            JobState.Queued => "排队中",
            JobState.Running => "进行中",
            JobState.Paused => "已暂停",
            JobState.Completed => "已完成",
            JobState.CompletedWithErrors => "已完成（部分出错）",
            JobState.Cancelled => "已取消",
            JobState.Failed => "失败",
            _ => Job.State.ToString()
        };

        var parts = new List<string> { $"{Job.CompletedItems:N0} / {Job.TotalItems:N0} 个项目" };
        if (Job.TotalBytes > 0)
            parts.Add($"{FileEntry.FormatSize(Job.CompletedBytes)} / {FileEntry.FormatSize(Job.TotalBytes)}");
        if (Job.BytesPerSecond > 1) parts.Add($"{FileEntry.FormatSize((long)Job.BytesPerSecond)}/s");
        if (Job.Eta is { } eta && eta.TotalSeconds > 1 && eta.TotalHours < 24) parts.Add($"剩余 {eta:mm\\:ss}");
        ProgressText = string.Join(" · ", parts);

        CurrentItem = Job.CurrentItem ?? string.Empty;
        if (!string.IsNullOrEmpty(Job.Error)) CurrentItem = Job.Error!;

        Progress = Job.Progress;
        IsIndeterminate = Job.IsIndeterminate;
        CanPause = Job.CanPause;
        CanCancel = Job.CanCancel;
        IsFinished = Job.IsFinished;
        PauseGlyph = Job.State == JobState.Paused ? "\uE768" : "\uE769";
    }
}