using Microsoft.Extensions.Logging;
using SSPCTester.Devices.Interfaces;

namespace SSPCTester.Devices.Drivers.Mock;

/// <summary>
/// 模拟程控电源：保存设定值，读取时返回带噪声的设定值。
/// </summary>
public sealed class MockPowerSupply : MockDeviceBase, IPowerSupply
{
    private readonly Random _rng = new(2026);
    private double _setVolts = 28.2;
    private double _setAmps = 5.0;
    private bool _output = true;

    public MockPowerSupply(ILogger<MockPowerSupply> logger)
        : base(logger, "电源 UDP5080 (Mock)")
    {
    }

    public async Task SetVoltageAsync(double volts, CancellationToken ct = default)
    {
        await Task.Delay(10, ct).ConfigureAwait(false);
        _setVolts = volts;
    }

    public async Task SetCurrentLimitAsync(double amps, CancellationToken ct = default)
    {
        await Task.Delay(10, ct).ConfigureAwait(false);
        _setAmps = amps;
    }

    public async Task OutputAsync(bool on, CancellationToken ct = default)
    {
        await Task.Delay(10, ct).ConfigureAwait(false);
        _output = on;
    }

    public Task<bool> GetOutputStateAsync(CancellationToken ct = default) =>
        Task.FromResult(_output);

    public Task<(double volts, double amps)> ReadAsync(CancellationToken ct = default)
    {
        if (!_output) return Task.FromResult((0.0, 0.0));
        double v = _setVolts * (1 + (_rng.NextDouble() - 0.5) * 0.002);
        double nominalCurrent = Math.Min(Math.Max(_setAmps, 0.0), 1.05);
        double i = nominalCurrent * (1 + (_rng.NextDouble() - 0.5) * 0.006);
        return Task.FromResult((v, i));
    }

    public Task<string> QueryIdentityAsync(CancellationToken ct = default) =>
        Task.FromResult("UNI-T,UDP5080-100,MOCK,1.0");

    public Task<string> QueryErrorAsync(CancellationToken ct = default) =>
        Task.FromResult("0,\"No error\"");
}