using System.ComponentModel.DataAnnotations;

namespace ZB.MOM.WW.OtOpcUa.Driver.FOCAS;

/// <summary>
///     FOCAS driver configuration. One instance supports N CNC devices. Per plan decision #144
///     each device gets its own <c>(DriverInstanceId, HostAddress)</c> bulkhead key at the
///     Phase 6.1 resilience layer.
/// </summary>
public sealed class FocasDriverOptions
{
    /// <summary>Gets the list of configured CNC devices.</summary>
    public IReadOnlyList<FocasDeviceOptions> Devices { get; init; } = [];
    /// <summary>Gets the list of FOCAS tag definitions.</summary>
    public IReadOnlyList<FocasTagDefinition> Tags { get; init; } = [];
    /// <summary>Gets the probe options.</summary>
    public FocasProbeOptions Probe { get; init; } = new();
    /// <summary>Gets the timeout duration for operations.</summary>
    public TimeSpan Timeout { get; init; } = TimeSpan.FromSeconds(2);
    /// <summary>Gets the alarm projection options.</summary>
    public FocasAlarmProjectionOptions AlarmProjection { get; init; } = new();
    /// <summary>Gets the handle recycle options.</summary>
    public FocasHandleRecycleOptions HandleRecycle { get; init; } = new();
    /// <summary>Gets the fixed tree options.</summary>
    public FocasFixedTreeOptions FixedTree { get; init; } = new();

    /// <summary>
    ///     Timeout for the AdminUI Test Connect probe, in seconds. The AdminUI clamps to a
    ///     60s server-side maximum; this default is what the form pre-fills for new instances.
    /// </summary>
    [Display(Name = "Probe timeout (seconds)", Description = "Connection test timeout. Default 10s.", GroupName = "Diagnostics")]
    [Range(1, 60)]
    public int ProbeTimeoutSeconds { get; init; } = 10;
}

/// <summary>
///     Fixed-node tree exposed by FOCAS per <c>docs/v2/driver-specs.md §7</c> —
///     <c>Identity/</c>, <c>Axes/{name}/</c>, etc. populated from
///     <c>cnc_sysinfo</c> / <c>cnc_rdaxisname</c> / <c>cnc_rddynamic2</c>. Disabled by
///     default so existing configs that only use user-authored tags don't grow new
///     nodes on upgrade.
/// </summary>
public sealed class FocasFixedTreeOptions
{
    /// <summary>Gets or sets a value indicating whether the fixed-node tree is enabled for every configured device.</summary>
    public bool Enabled { get; init; } = false;

    /// <summary>
    ///     Poll cadence for <c>cnc_rddynamic2</c>. Each tick calls the API once per
    ///     configured axis + publishes OnDataChange for the axis subtree. Real CNCs
    ///     serve ~100ms loops comfortably; the default is conservative.
    /// </summary>
    public TimeSpan PollInterval { get; init; } = TimeSpan.FromMilliseconds(250);

    /// <summary>
    ///     Poll cadence for program + operation-mode info. Slower than the axis
    ///     poll because program / mode transitions happen on operator timescales.
    ///     Zero / negative disables the program poll entirely.
    /// </summary>
    public TimeSpan ProgramPollInterval { get; init; } = TimeSpan.FromSeconds(1);

    /// <summary>
    ///     Poll cadence for timers (power-on / operating / cutting / cycle).
    ///     These change at human timescales — default is 30s. Zero / negative
    ///     disables the timer poll entirely.
    /// </summary>
    public TimeSpan TimerPollInterval { get; init; } = TimeSpan.FromSeconds(30);
}

/// <summary>
///     Proactive session-recycle cadence. Fanuc CNCs have a finite FWLIB handle pool
///     (~5–10 concurrent connections) and certain series have documented handle-leak bugs
///     that manifest after long uptime. When <see cref="Enabled"/> is <c>true</c> the
///     driver closes + reopens each device's session on the <see cref="Interval"/> cadence,
///     forcing FWLIB to release its handle slot back to the pool. Reads / writes during
///     recycle wait for the reconnect rather than failing — worst case an operator sees a
///     brief read latency spike once per cadence.
/// </summary>
/// <remarks>
///     Disabled by default because a healthy CNC + driver doesn't need it. Enable when
///     field experience shows handle exhaustion against a specific series / firmware.
///     Typical tuning: 30 min for sites running multiple OtOpcUa instances against the
///     same CNC (they share the pool); 6 h for a single-client deployment.
/// </remarks>
public sealed class FocasHandleRecycleOptions
{
    /// <summary>Gets or sets a value indicating whether handle recycling is enabled.</summary>
    public bool Enabled { get; init; } = false;
    /// <summary>Gets or sets the interval for handle recycle operations.</summary>
    public TimeSpan Interval { get; init; } = TimeSpan.FromHours(1);
}

/// <summary>
///     Controls the CNC active-alarm polling projection that surfaces FOCAS alarms via
///     <c>IAlarmSource</c>. Disabled by default — operators opt in by setting
///     <see cref="Enabled"/> in <c>appsettings.json</c>.
/// </summary>
public sealed class FocasAlarmProjectionOptions
{
    /// <summary>Gets or sets a value indicating whether alarm projection is enabled.</summary>
    public bool Enabled { get; init; } = false;

    /// <summary>Poll cadence. One <c>cnc_rdalmmsg2</c> call per device per tick.</summary>
    public TimeSpan PollInterval { get; init; } = TimeSpan.FromSeconds(2);
}

/// <summary>
///     One CNC the driver talks to. <paramref name="Series"/> enables per-series
///     address validation at <c>FocasDriver.InitializeAsync</c>; leave as
///     <see cref="FocasCncSeries.Unknown"/> to skip validation (legacy behaviour).
/// </summary>
/// <param name="HostAddress">
///     FOCAS TCP endpoint in <c>focas://{ip}[:{port}]</c> form, e.g.
///     <c>focas://10.20.30.40:8193</c>. The port defaults to 8193 when omitted.
///     Parsed by <c>FocasHostAddress.TryParse</c> at <c>FocasDriver.InitializeAsync</c>.
/// </param>
/// <param name="DeviceName">
///     Optional human-readable label shown in the OPC UA address-space folder for this
///     device. Defaults to <paramref name="HostAddress"/> when <c>null</c>.
/// </param>
/// <param name="Series">
///     CNC controller series. Used by <see cref="FocasCapabilityMatrix"/> to gate which
///     FOCAS addresses are valid. Leave as <see cref="FocasCncSeries.Unknown"/> (the
///     default) to skip range validation and preserve legacy behaviour.
/// </param>
/// <param name="PositionDecimalPlaces">
///     Axis positions returned by <c>cnc_rddynamic2</c> are scaled integers. The driver
///     divides AbsolutePosition / MachinePosition / RelativePosition / DistanceToGo by
///     <c>10^PositionDecimalPlaces</c> at the publish seam so they surface in engineering
///     units on the Float64 axis nodes. Default <c>0</c> (no scaling) is byte-identical to
///     legacy behaviour. Auto-fetching this via <c>cnc_getfigure</c> is deferred (wire-gated),
///     so it is config-supplied. Negative values are clamped to 0 (no scaling).
/// </param>
public sealed record FocasDeviceOptions(
    string HostAddress,
    string? DeviceName = null,
    FocasCncSeries Series = FocasCncSeries.Unknown,
    int PositionDecimalPlaces = 0)
{
    /// <summary>
    ///     Axis-position decimal places, clamped to a non-negative value so the
    ///     <c>10^PositionDecimalPlaces</c> divide at the publish seam can never misbehave.
    /// </summary>
    public int PositionDecimalPlaces { get; init; } =
        PositionDecimalPlaces < 0 ? 0 : PositionDecimalPlaces;
}

/// <summary>
///     One FOCAS-backed OPC UA variable. <paramref name="Address"/> is the canonical FOCAS
///     address string that parses via <c>FocasAddress.TryParse</c> —
///     <c>X0.0</c> / <c>R100</c> / <c>PARAM:1815/0</c> / <c>MACRO:500</c>.
/// </summary>
/// <param name="Writable">
///     Whether the tag is declared writable in config. Reflected at the
///     <c>DiscoverAsync</c> address-space advertisement seam and gates the driver's
///     write path — FOCAS supports PMC/data writes (see <c>FocasPmcBitRmwTests</c> /
///     <c>FocasReadWriteTests</c>). Defaults to <c>true</c>.
/// </param>
/// <param name="WriteIdempotent">
///     Whether repeated writes of the same value are safe. Threaded through to
///     <c>DriverAttributeInfo.WriteIdempotent</c> by <c>DiscoverAsync</c> so OPC UA
///     clients can optimise write coalescing for idempotent tags. Defaults to <c>false</c>.
/// </param>
public sealed record FocasTagDefinition(
    string Name,
    string DeviceHostAddress,
    string Address,
    FocasDataType DataType,
    bool Writable = true,
    bool WriteIdempotent = false);

/// <summary>
///     Controls periodic connectivity probing. One <c>cnc_rdcncstat</c> call per
///     configured device per tick; transitions fire <c>OnHostStatusChanged</c>.
///     Enabled by default so the driver surfaces a fast host-state transition when
///     a CNC goes offline between data reads.
/// </summary>
public sealed class FocasProbeOptions
{
    /// <summary>Gets or sets a value indicating whether probing is enabled.</summary>
    public bool Enabled { get; init; } = true;
    /// <summary>Gets or sets the probe interval.</summary>
    public TimeSpan Interval { get; init; } = TimeSpan.FromSeconds(5);
    /// <summary>Gets or sets the probe timeout.</summary>
    public TimeSpan Timeout { get; init; } = TimeSpan.FromSeconds(2);
}