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

namespace SSPCTester.Devices.Drivers.Mock;

/// <summary>
/// 模拟可编程负载。
/// </summary>
public sealed class MockLoad : MockDeviceBase, ILoad
{
    private readonly Random _rng = new(4096);
    private LoadMode _mode = LoadMode.CC;
    private double _value = 1.0;
    private bool _input = true;

    public MockLoad(ILogger<MockLoad> logger)
        : base(logger, "负载：IT8702P+IT8733P (Mock)")
    {
    }

    public async Task SetModeAsync(LoadMode mode, CancellationToken ct = default)
    {
        await Task.Delay(10, ct).ConfigureAwait(false);
        _mode = mode;
    }

    public async Task SetValueAsync(double value, CancellationToken ct = default)
    {
        await Task.Delay(10, ct).ConfigureAwait(false);
        _value = value;
    }

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

    public Task<bool> GetInputStateAsync(CancellationToken ct = default) =>
        Task.FromResult(_input);

    public async Task ResetAsync(CancellationToken ct = default)
    {
        await Task.Delay(10, ct).ConfigureAwait(false);
        _mode = LoadMode.CC;
        _value = 0;
        _input = false;
    }

    public Task<(double volts, double amps)> ReadAsync(CancellationToken ct = default)
    {
        if (!_input) return Task.FromResult((0.0, 0.0));
        // CC 模式下电流接近设定值；其他模式简化处理
        double i = _mode == LoadMode.CC ? _value : 1.0;
        double v = 27.4 + (_rng.NextDouble() - 0.5) * 0.1;
        i *= 1 + (_rng.NextDouble() - 0.5) * 0.01;
        return Task.FromResult((v, i));
    }

    public Task<PowerReading> ReadPowerAsync(CancellationToken ct = default)
    {
        if (!_input) return Task.FromResult(new PowerReading(0.0, 0.0, 0.0));
        double i = _mode == LoadMode.CC ? _value : 1.0;
        double v = 27.4 + (_rng.NextDouble() - 0.5) * 0.1;
        i *= 1 + (_rng.NextDouble() - 0.5) * 0.01;
        return Task.FromResult(new PowerReading(v, i, v * i));
    }

    public Task<string> QueryIdentityAsync(CancellationToken ct = default) =>
        Task.FromResult("ITECH,IT8702P,MOCK,1.0");

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