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//! Rust port of [Floating UI](https://floating-ui.com/).
//!
//! This is the library to use Floating UI on the web, wrapping [`floating_ui_core`] with DOM interface logic.
//!
//! See [@floating-ui/dom](https://www.npmjs.com/package/@floating-ui/dom) for the original package.

mod auto_update;
mod middleware;
mod platform;
mod types;
mod utils;

pub use crate::auto_update::*;
pub use crate::middleware::*;
pub use crate::types::*;
pub use floating_ui_core::{
    ComputePositionReturn, Derivable, DerivableFn, DetectOverflowOptions, Middleware,
    MiddlewareData, MiddlewareReturn, MiddlewareState, MiddlewareWithOptions,
};
#[doc(no_inline)]
pub use floating_ui_utils::{
    dom, AlignedPlacement, Alignment, Axis, ClientRectObject, Coords, Dimensions, ElementRects,
    Length, Padding, PartialSideObject, Placement, Rect, Side, SideObject, Strategy,
    VirtualElement,
};

use floating_ui_core::{
    compute_position as compute_position_core, ComputePositionConfig as CoreComputePositionConfig,
};
use web_sys::Element;

use self::platform::Platform;

const PLATFORM: Platform = Platform {};

/// Options for [`compute_position`].
#[derive(Clone, Default)]
pub struct ComputePositionConfig {
    /// Where to place the floating element relative to the reference element.
    ///
    /// Defaults to [`Placement::Bottom`].
    pub placement: Option<Placement>,

    /// The strategy to use when positioning the floating element.
    ///
    /// Defaults to [`Strategy::Absolute`].
    pub strategy: Option<Strategy>,

    /// Vector of middleware objects to modify the positioning or provide data for rendering.
    ///
    /// Defaults to an empty vector.
    pub middleware: Option<MiddlewareVec>,
}

impl ComputePositionConfig {
    /// Set `placement` option.
    pub fn placement(mut self, value: Placement) -> Self {
        self.placement = Some(value);
        self
    }

    /// Set `strategy` option.
    pub fn strategy(mut self, value: Strategy) -> Self {
        self.strategy = Some(value);
        self
    }

    /// Set `middleware` option.
    pub fn middleware(mut self, value: MiddlewareVec) -> Self {
        self.middleware = Some(value);
        self
    }
}

/// Computes the `x` and `y` coordinates that will place the floating element next to a given reference element.
pub fn compute_position(
    reference: ElementOrVirtual,
    floating: &Element,
    config: Option<ComputePositionConfig>,
) -> ComputePositionReturn {
    let config = config.unwrap_or_default();

    // TODO: cache

    compute_position_core(
        reference,
        floating,
        CoreComputePositionConfig {
            platform: &PLATFORM,
            placement: config.placement,
            strategy: config.strategy,
            middleware: config.middleware,
        },
    )
}