// Copyright 2022 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library fuchsia.ui.test.input;

using zx;

/// A hardcoded number of max mouse buttons. This should be increased in the future
/// if we ever see mice with more buttons.
const MOUSE_MAX_NUM_BUTTONS uint32 = 32;

/// Identifies various buttons on a standard mouse.
type MouseButton = flexible enum {
    /// "Left" mouse button.
    FIRST = 0;

    /// "Right" mouse button.
    SECOND = 1;

    /// "Third" mouse button.
    THIRD = 2;
};

/// Identifies the phase of a mouse event.
type MouseEventPhase = flexible enum {
    /// The observer has started tracking the mouse.
    ADD = 0;

    /// The mouse has moved since the last ADD event, without an interceding DOWN
    /// event.
    HOVER = 1;

    /// One or more mouse buttons have been pressed.
    DOWN = 2;

    /// The mouse has moved since the last DOWN event.
    MOVE = 3;

    /// All pressed buttons have been released.
    UP = 4;

    /// The mouse wheel was manipulated.
    WHEEL = 5;
};

/// A tool to inject mouse events into Input Pipeline.
///
/// Please extend as necessary.
closed protocol Mouse {
    /// Injects an input report corresponding to the event specified.
    ///
    /// NOTE: the `movement` parameters have a range of [-1000, 1000],
    /// and the `scroll` parameters have a range of [-100, 100].
    strict SimulateMouseEvent(table {
        /// Set of buttons that are currently pressed.
        /// Must NOT contain duplicates.
        1: pressed_buttons vector<MouseButton>:MOUSE_MAX_NUM_BUTTONS;

        /// Relative X positional displacement.
        2: movement_x int64;

        /// Relative Y positional displacement.
        3: movement_y int64;

        /// Relative vertical scrolling displacement by detent.
        4: scroll_v_detent int64;

        /// Relative horizontal scrolling displacement by detent.
        5: scroll_h_detent int64;

        /// Recommended vertical scrolling displacement by physical pixel, it is
        /// computed with accelerator, detent / mm to pixel ratio, etc.
        6: scroll_v_physical_pixel float64;

        /// Recommended horizontal scrolling displacement by physical pixel, it
        /// is computed with accelerator, detent / mm to pixel ratio, etc.
        7: scroll_h_physical_pixel float64;
    }) -> ();
};

/// A tool for applications to report touch input to interested parties (e.g. a test
/// fixture).
@discoverable
closed protocol MouseInputListener {
    /// Report that component under test has received expected input.
    strict ReportMouseInput(table {
        /// The horizontal coordinate in the reporter's coordinate system.
        1: local_x float64;

        /// The vertical coordinate in the reporter's coordinate system.
        2: local_y float64;

        /// The monotonic time (ns) the mouse event was received by the client.
        /// Note that this value should be used with caution. Some reporters may not be
        /// capable of ns-level precision, but still report in ns-level units.
        3: time_received zx.Time;

        /// Name of the component to help distinguish responses from multiple components.
        ///
        /// NOTE: This name is *independent* of component framework, so the reporter and
        /// listener are free to agree on an arbitrary value.
        4: component_name string:1024;

        /// The pressed buttons that the reporter received.
        5: buttons vector<MouseButton>:MOUSE_MAX_NUM_BUTTONS;

        /// The phase of the mouse event that the reporter received.
        6: phase MouseEventPhase;

        /// The device pixel ratio of which the reporter is aware.
        ///
        /// Some reporters may account for this scale factor when converting to local
        /// coordinates.
        7: device_pixel_ratio float64;

        /// The horizontal wheel scroll delta in physical pixels.
        8: wheel_x_physical_pixel float64;

        /// The vertical wheel scroll delta in physical pixels.
        9: wheel_y_physical_pixel float64;
    });
};