//! All VST plugin editor related functionality.

use num_enum::{IntoPrimitive, TryFromPrimitive};

use std::os::raw::c_void;

/// Implemented by plugin editors.
#[allow(unused_variables)]
pub trait Editor {
    /// Get the size of the editor window.
    fn size(&self) -> (i32, i32);

    /// Get the coordinates of the editor window.
    fn position(&self) -> (i32, i32);

    /// Editor idle call. Called by host.
    fn idle(&mut self) {}

    /// Called when the editor window is closed.
    fn close(&mut self) {}

    /// Called when the editor window is opened.
    ///
    /// `parent` is a window pointer that the new window should attach itself to.
    /// **It is dependent upon the platform you are targeting.**
    ///
    /// A few examples:
    ///
    ///  - On Windows, it should be interpreted as a `HWND`
    ///  - On Mac OS X (64 bit), it should be interpreted as a `NSView*`
    ///  - On X11 platforms, it should be interpreted as a `u32` (the ID number of the parent window)
    ///
    /// Return `true` if the window opened successfully, `false` otherwise.
    fn open(&mut self, parent: *mut c_void) -> bool;

    /// Return whether the window is currently open.
    fn is_open(&mut self) -> bool;

    /// Set the knob mode for this editor (if supported by host).
    ///
    /// Return `true` if the knob mode was set.
    fn set_knob_mode(&mut self, mode: KnobMode) -> bool {
        false
    }

    /// Receive key up event. Return `true` if the key was used.
    fn key_up(&mut self, keycode: KeyCode) -> bool {
        false
    }

    /// Receive key down event. Return `true` if the key was used.
    fn key_down(&mut self, keycode: KeyCode) -> bool {
        false
    }
}

/// Rectangle used to specify dimensions of editor window.
#[doc(hidden)]
#[derive(Copy, Clone, Debug)]
pub struct Rect {
    /// Y value in pixels of top side.
    pub top: i16,
    /// X value in pixels of left side.
    pub left: i16,
    /// Y value in pixels of bottom side.
    pub bottom: i16,
    /// X value in pixels of right side.
    pub right: i16,
}

/// A platform independent key code. Includes modifier keys.
#[derive(Copy, Clone, Debug)]
pub struct KeyCode {
    /// ASCII character for key pressed (if applicable).
    pub character: char,
    /// Key pressed. See `enums::Key`.
    pub key: Key,
    /// Modifier key bitflags. See `enums::flags::modifier_key`.
    pub modifier: u8,
}

/// Allows host to set how a parameter knob works.
#[repr(isize)]
#[derive(Copy, Clone, Debug, TryFromPrimitive, IntoPrimitive)]
#[allow(missing_docs)]
pub enum KnobMode {
    Circular,
    CircularRelative,
    Linear,
}

/// Platform independent key codes.
#[allow(missing_docs)]
#[repr(isize)]
#[derive(Debug, Copy, Clone, TryFromPrimitive, IntoPrimitive)]
pub enum Key {
    None = 0,
    Back,
    Tab,
    Clear,
    Return,
    Pause,
    Escape,
    Space,
    Next,
    End,
    Home,
    Left,
    Up,
    Right,
    Down,
    PageUp,
    PageDown,
    Select,
    Print,
    Enter,
    Snapshot,
    Insert,
    Delete,
    Help,
    Numpad0,
    Numpad1,
    Numpad2,
    Numpad3,
    Numpad4,
    Numpad5,
    Numpad6,
    Numpad7,
    Numpad8,
    Numpad9,
    Multiply,
    Add,
    Separator,
    Subtract,
    Decimal,
    Divide,
    F1,
    F2,
    F3,
    F4,
    F5,
    F6,
    F7,
    F8,
    F9,
    F10,
    F11,
    F12,
    Numlock,
    Scroll,
    Shift,
    Control,
    Alt,
    Equals,
}