using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;
using LiveChartsCore;
using LiveChartsCore.SkiaSharpView;
using Microsoft.Extensions.Logging;
using WCTDataMiner.Core.Services;
using WCTDataMiner.Wpf.Messages;

namespace WCTDataMiner.Wpf.ViewModels;

/// <summary>
/// Ploss 折线图 ViewModel
/// </summary>
public partial class PlossChartViewModel : ObservableObject
{
    private readonly ScenarioService _scenarioService;
    private readonly ILogger<PlossChartViewModel> _logger;

    [ObservableProperty]
    private Guid _scenarioId;

    [ObservableProperty]
    private ISeries[] _series;

    [ObservableProperty]
    private Axis[] _xAxes;

    [ObservableProperty]
    private Axis[] _yAxes;

    [ObservableProperty]
    private bool _isLoading;

    [ObservableProperty]
    private string _loadingMessage = "";

    public PlossChartViewModel(
        ScenarioService scenarioService,
        ILogger<PlossChartViewModel> logger)
    {
        _scenarioService = scenarioService;
        _logger = logger;

        // 初始化图表配置
        Series = Array.Empty<ISeries>();
        XAxes = new Axis[] { new Axis { Name = "Trigger Count" } };
        YAxes = new Axis[] { new Axis { Name = "Power Loss (mW)" } };
    }

    /// <summary>
    /// ScenarioId 属性变更时自动触发数据加载
    /// </summary>
    partial void OnScenarioIdChanged(Guid value)
    {
        if (value != Guid.Empty)
        {
            _ = LoadDataAsync().ContinueWith(t =>
            {
                if (t.Exception != null)
                {
                    _logger.LogError(t.Exception, "LoadDataAsync 失败: ScenarioId={ScenarioId}", value);
                }
            }, TaskContinuationOptions.OnlyOnFaulted);
        }
    }

    [RelayCommand]
    private void SwitchToTable()
    {
        WeakReferenceMessenger.Default.Send(new NavigateToPlossTableMessage(ScenarioId));
    }

    public async Task LoadDataAsync()
    {
        if (IsLoading) return; // 防并发

        IsLoading = true;
        LoadingMessage = "正在加载数据...";

        try
        {
            var records = await _scenarioService.GetPlossRecordsByScenarioIdAsync(ScenarioId);

            if (records.Count == 0)
            {
                Series = Array.Empty<ISeries>();
                _logger.LogWarning("未找到 Ploss 数据: ScenarioId={ScenarioId}", ScenarioId);
                LoadingMessage = "无数据";
                return;
            }

            // 构建 Ploss 曲线 (Field7) 和 Threshold 阈值线 (Field8)
            var plossValues = records.Select(r => (double)r.Field7).ToArray();
            var thresholdValues = records.Select(r => (double)r.Field8).ToArray();
            var triggerLabels = records.Select(r => r.Field9.ToString()).ToArray();

            Series = new ISeries[]
            {
                new LineSeries<double>
                {
                    Name = "Ploss",
                    Values = plossValues,
                    Fill = null,
                    GeometrySize = 5
                },
                new LineSeries<double>
                {
                    Name = "Threshold",
                    Values = thresholdValues,
                    Fill = null,
                    GeometrySize = 0,
                    LineSmoothness = 0  // 直线
                }
            };

            // 更新 X 轴标签
            XAxes = new Axis[]
            {
                new Axis
                {
                    Name = "Trigger Count",
                    Labels = triggerLabels
                }
            };

            _logger.LogInformation("加载 Ploss 图表数据成功: ScenarioId={ScenarioId}, 记录数={Count}", ScenarioId, records.Count);
            LoadingMessage = "";
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "加载 Ploss 图表数据失败: ScenarioId={ScenarioId}", ScenarioId);
            LoadingMessage = $"加载失败: {ex.Message}";
        }
        finally
        {
            IsLoading = false;
        }
    }
}