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//! Load and draw vector graphics.
use crate::{Color, Rectangle, Size};

use rustc_hash::FxHasher;
use std::borrow::Cow;
use std::hash::{Hash, Hasher as _};
use std::path::PathBuf;
use std::sync::Arc;

/// A handle of Svg data.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Handle {
    id: u64,
    data: Arc<Data>,
}

impl Handle {
    /// Creates an SVG [`Handle`] pointing to the vector image of the given
    /// path.
    pub fn from_path(path: impl Into<PathBuf>) -> Handle {
        Self::from_data(Data::Path(path.into()))
    }

    /// Creates an SVG [`Handle`] from raw bytes containing either an SVG string
    /// or gzip compressed data.
    ///
    /// This is useful if you already have your SVG data in-memory, maybe
    /// because you downloaded or generated it procedurally.
    pub fn from_memory(bytes: impl Into<Cow<'static, [u8]>>) -> Handle {
        Self::from_data(Data::Bytes(bytes.into()))
    }

    fn from_data(data: Data) -> Handle {
        let mut hasher = FxHasher::default();
        data.hash(&mut hasher);

        Handle {
            id: hasher.finish(),
            data: Arc::new(data),
        }
    }

    /// Returns the unique identifier of the [`Handle`].
    pub fn id(&self) -> u64 {
        self.id
    }

    /// Returns a reference to the SVG [`Data`].
    pub fn data(&self) -> &Data {
        &self.data
    }
}

impl<T> From<T> for Handle
where
    T: Into<PathBuf>,
{
    fn from(path: T) -> Handle {
        Handle::from_path(path.into())
    }
}

impl Hash for Handle {
    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
        self.id.hash(state);
    }
}

/// The data of a vectorial image.
#[derive(Clone, Hash, PartialEq, Eq)]
pub enum Data {
    /// File data
    Path(PathBuf),

    /// In-memory data
    ///
    /// Can contain an SVG string or a gzip compressed data.
    Bytes(Cow<'static, [u8]>),
}

impl std::fmt::Debug for Data {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Data::Path(path) => write!(f, "Path({path:?})"),
            Data::Bytes(_) => write!(f, "Bytes(...)"),
        }
    }
}

/// A [`Renderer`] that can render vector graphics.
///
/// [renderer]: crate::renderer
pub trait Renderer: crate::Renderer {
    /// Returns the default dimensions of an SVG for the given [`Handle`].
    fn measure_svg(&self, handle: &Handle) -> Size<u32>;

    /// Draws an SVG with the given [`Handle`], an optional [`Color`] filter, and inside the provided `bounds`.
    fn draw_svg(
        &mut self,
        handle: Handle,
        color: Option<Color>,
        bounds: Rectangle,
    );
}