using System.Collections.ObjectModel;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using SSPCTester.Devices.Config;
using SSPCTester.Devices.Interfaces;
using SSPCTester.Logic.Models;
using SSPCTester.UI.Services;

namespace SSPCTester.UI.ViewModels;

/// <summary>功率损耗页 VM。</summary>
public partial class PowerTestViewModel : ObservableObject
{
    private readonly ISspc _sspc;
    private readonly IPowerSupply _power;
    private readonly ILoad _load;
    private readonly UiLogSink _log;

    public ObservableCollection<PowerLossRow> Rows { get; } = new();
    public ObservableCollection<int> Channels { get; } = new();
    [ObservableProperty] private Project? _project;
    [ObservableProperty] private int _selectedChannel;
    [ObservableProperty] private int _samplesPerChannel = 5;
    [ObservableProperty] private int _intervalMs = 100;
    [ObservableProperty] private PowerLossRow? _current;
    [ObservableProperty] private bool _busy;

    public bool CanOperate => !Busy;

    public PowerTestViewModel(ISspc sspc, IPowerSupply power, ILoad load, UiLogSink log)
    {
        _sspc = sspc;
        _power = power;
        _load = load;
        _log = log;
        for (int i = 1; i <= sspc.ChannelCount; i++) Channels.Add(i);
        SelectedChannel = 1;
    }

    partial void OnBusyChanged(bool value) => OnPropertyChanged(nameof(CanOperate));

    public void SetProject(Project p)
    {
        Project = p;
        Rows.Clear();
        if (p.PowerResults.Count == 0)
        {
            for (int i = 1; i <= Channels.Count; i++)
                p.PowerResults.Add(new PowerLossRow { Channel = i });
        }
        foreach (var r in p.PowerResults) Rows.Add(r);
        Current = Rows.FirstOrDefault();
    }

    [RelayCommand]
    private async Task TurnOnCurrentChannel()
    {
        Busy = true;
        int ch = SelectedChannel;
        try
        {
            if (!_sspc.IsConnected) await _sspc.ConnectAsync();
            await _sspc.TurnOnAsync(ch);
            _log.Add(UiLogLevel.Info, $"CH{ch} 已开启。");
        }
        catch (Exception ex)
        {
            _log.Add(UiLogLevel.Error, $"CH{ch} 开启失败：{ex.Message}");
        }
        finally
        {
            Busy = false;
        }
    }

    [RelayCommand]
    private async Task TurnOffCurrentChannel()
    {
        Busy = true;
        int ch = SelectedChannel;
        try
        {
            if (!_sspc.IsConnected) await _sspc.ConnectAsync();
            await _sspc.TurnOffAsync(ch);
            _log.Add(UiLogLevel.Info, $"CH{ch} 已关断。");
        }
        catch (Exception ex)
        {
            _log.Add(UiLogLevel.Error, $"CH{ch} 关断失败：{ex.Message}");
        }
        finally
        {
            Busy = false;
        }
    }

    [RelayCommand]
    private async Task MeasureCurrent()
    {
        if (Project == null) return;
        Busy = true;
        int ch = SelectedChannel;
        var row = Rows.First(r => r.Channel == ch);
        try
        {
            // 功率损耗输入端来自 UDP5080-100 电源实时测量。

            try
            {
                await Task.CompletedTask;
            }
            catch (Exception ex)
            {
                throw new InvalidOperationException($"Modbus（继电器端）连接失败：{ex.Message}。请在设置中检查串口与连接。", ex);
            }
            try
            {
                if (!_power.IsConnected) await _power.ConnectAsync();
            }
            catch (Exception ex)
            {
                throw new InvalidOperationException($"高速采集卡连接失败：{ex.Message}。请在设置中检查采集卡。", ex);
            }

            try
            {
                if (!_load.IsConnected) await _load.ConnectAsync();
            }
            catch (Exception ex)
            {
                throw new InvalidOperationException($"IT8702P connection failed: {ex.Message}", ex);
            }

            double sVin = 0, sIin = 0, sVout = 0, sIout = 0, sPout = 0;
            for (int s = 0; s < SamplesPerChannel; s++)
            {
                /*
                // 输出端：Modbus 继电器端电压 + 通流电流（SSPC 为串联开关，Iin = Iout）。
                var measurement = await _load.ReadPowerAsync();
                // 输入端：高速采集卡电压。
                var daqValues = await _daq.ReadInstantAsync(new[] { daqVoltageChannel });
                */
                var input = await _power.ReadAsync();
                var measurement = await _load.ReadPowerAsync();
                double vin = input.volts;
                double iin = Math.Abs(input.amps);
                double vout = measurement.Volts;
                double iout = Math.Abs(measurement.Amps);
                double pout = measurement.Watts;
                if (!double.IsFinite(vin) || !double.IsFinite(iin) || !double.IsFinite(vout) || !double.IsFinite(iout) || !double.IsFinite(pout))
                    throw new InvalidOperationException("功率损耗采样无效，请检查采集卡电压通道标定与 Modbus 连接。");

                sVin += vin;
                sIin += iin;
                sVout += vout;
                sIout += iout;
                sPout += pout;
                await Task.Delay(IntervalMs);
            }

            row.Vin = sVin / SamplesPerChannel;
            row.Iin = sIin / SamplesPerChannel;
            row.Vout = sVout / SamplesPerChannel;
            row.Iout = sIout / SamplesPerChannel;
            row.MeasuredPowerOut = sPout / SamplesPerChannel;
            row.Status = TestStatus.Measured;
            Current = row;
            _log.Add(UiLogLevel.Success, $"CH{ch} 功率损耗 {row.PowerLossW:F3} W，效率 {row.EfficiencyPct:F3}%");
        }
        catch (Exception ex)
        {
            row.Status = TestStatus.Fail;
            _log.Add(UiLogLevel.Error, $"CH{ch} 功率损耗读取失败：{ex.Message}");
        }
        finally
        {
            Busy = false;
        }
    }

    /// <summary>解析用于输入端电压的高速采集卡通道（取已标定的电压通道，优先 OutputVoltage）。</summary>
    private static int ResolveDaqVoltageChannel(DaqOptions options)
    {
        if (options.Channels == null || options.Channels.Count == 0)
            throw new InvalidOperationException("未配置采集卡通道，无法执行功率损耗测试。");

        var candidates = options.Channels
            .Where(x => x.PhysicalChannel >= 0 && x.PhysicalChannel < options.ChannelCount)
            .Where(x => x.IsCalibrated)
            .Where(x => IsVoltageRole(x.Role))
            .ToArray();

        var pick = candidates.FirstOrDefault(x => string.Equals(x.Role, nameof(DaqChannelRole.OutputVoltage), StringComparison.OrdinalIgnoreCase))
            ?? candidates.FirstOrDefault();
        if (pick == null)
            throw new InvalidOperationException("功率损耗测试需要一个已标定的采集卡电压通道（输入端电压），请在设置中配置并标定。");
        return pick.PhysicalChannel;
    }

    private static bool IsVoltageRole(string? role) =>
        Enum.TryParse<DaqChannelRole>(role, true, out var parsed)
        && parsed is DaqChannelRole.OutputVoltage or DaqChannelRole.InputVoltage;
}