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

namespace SSPCTester.Devices.Drivers.Mock;

/// <summary>
/// 所有 Mock 驱动的公共基类：实现 IDeviceConnection 的连接状态机。
/// </summary>
public abstract class MockDeviceBase : IDeviceConnection
{
    private readonly ILogger _logger;
    protected MockDeviceBase(ILogger logger, string displayName)
    {
        _logger = logger;
        DisplayName = displayName;
    }

    public bool IsConnected { get; private set; }
    public string DisplayName { get; }

    public event EventHandler<bool>? ConnectionChanged;

    public virtual async Task<bool> ConnectAsync(CancellationToken ct = default)
    {
        await Task.Delay(200, ct).ConfigureAwait(false);
        IsConnected = true;
        _logger.LogInformation("[Mock] {Device} 已连接。", DisplayName);
        ConnectionChanged?.Invoke(this, true);
        return true;
    }

    public virtual Task DisconnectAsync()
    {
        if (IsConnected)
        {
            IsConnected = false;
            _logger.LogInformation("[Mock] {Device} 已断开。", DisplayName);
            ConnectionChanged?.Invoke(this, false);
        }
        return Task.CompletedTask;
    }
}

/// <summary>
/// 模拟固态功率控制器：内部维护 24 路开关状态。
/// </summary>
public sealed class MockSspc : MockDeviceBase, ISspc
{
    private readonly bool[] _states;

    public MockSspc(IOptions<DeviceOptions> options, ILogger<MockSspc> logger)
        : base(logger, "SSPC (Mock)")
    {
        ChannelCount = 24;
        _states = new bool[ChannelCount];
    }

    public int ChannelCount { get; }

    public async Task TurnOnAsync(int physicalSlot, CancellationToken ct = default)
    {
        await Task.Delay(20, ct).ConfigureAwait(false);
        ValidateChannel(physicalSlot);
        _states[physicalSlot - 1] = true;
    }

    public async Task TurnOffAsync(int physicalSlot, CancellationToken ct = default)
    {
        await Task.Delay(20, ct).ConfigureAwait(false);
        ValidateChannel(physicalSlot);
        _states[physicalSlot - 1] = false;
    }

    public async Task FlashAsync(int physicalSlot, int milliseconds, CancellationToken ct = default)
    {
        await TurnOnAsync(physicalSlot, ct).ConfigureAwait(false);
        await Task.Delay(milliseconds, ct).ConfigureAwait(false);
        await TurnOffAsync(physicalSlot, ct).ConfigureAwait(false);
    }

    public Task<bool> GetChannelStateAsync(int physicalSlot, CancellationToken ct = default)
    {
        ValidateChannel(physicalSlot);
        return Task.FromResult(_states[physicalSlot - 1]);
    }

    public Task<ChannelMeasurement> ReadMeasurementAsync(int physicalSlot, CancellationToken ct = default)
    {
        ValidateChannel(physicalSlot);
        bool on = _states[physicalSlot - 1];
        return Task.FromResult(new ChannelMeasurement
        {
            PhysicalSlot = physicalSlot,
            Voltage = on ? 28.0 : 0.0,
            Current = on ? 1.0 : 0.0,
            VoltageRaw = on ? (ushort)2800 : (ushort)0,
            CurrentRaw = on ? (short)167 : (short)0,
            Timestamp = DateTimeOffset.Now
        });
    }

    public async Task<IReadOnlyList<ChannelMeasurement>> ReadMeasurementsAsync(CancellationToken ct = default)
    {
        var values = new ChannelMeasurement[ChannelCount];
        for (int slot = 1; slot <= ChannelCount; slot++)
            values[slot - 1] = await ReadMeasurementAsync(slot, ct).ConfigureAwait(false);
        return values;
    }

    private void ValidateChannel(int physicalSlot)
    {
        if (physicalSlot < 1 || physicalSlot > ChannelCount)
            throw new ArgumentOutOfRangeException(nameof(physicalSlot), physicalSlot, $"通道范围 1..{ChannelCount}");
    }
}