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// plotters-iced
//
// Iced backend for Plotters
// Copyright: 2021, Joylei <leingliu@gmail.com>
// License: MIT

#[cfg(not(target_arch = "wasm32"))]
use iced_graphics::canvas::{Cursor, Event, Frame, Geometry};
#[cfg(not(target_arch = "wasm32"))]
use iced_native::{event::Status, Rectangle, Size};
#[cfg(target_arch = "wasm32")]
use iced_web::{Rectangle, Size};
use plotters::{chart::ChartBuilder, coord::Shift, drawing::DrawingArea};
use plotters_backend::DrawingBackend;

#[cfg(target_arch = "wasm32")]
use dummy::*;

/// Chart View Model
///
/// use it with [`ChartWidget`].
///
/// ## Example
/// ```rust,ignore
/// use plotters::prelude::*;
/// use plotters_iced::{Chart,ChartWidget};
/// struct MyChart;
/// impl Chart<Message> for MyChart {
///     fn build_chart<DB:DrawingBackend>(&self, builder: ChartBuilder<DB>) {
///         //build your chart here, please refer to plotters for more details
///     }
/// }
///
/// impl MyChart {
///     fn view(&mut self)->Element<Message> {
///         ChartWidget::new(self)
///             .width(Length::Unit(200))
///             .height(Length::Unit(200))
///             .into()
///     }
/// }
/// ```
pub trait Chart<Message> {
    /// draw chart with [`ChartBuilder`]
    ///
    /// for simple chart, you impl this method
    fn build_chart<DB: DrawingBackend>(&self, builder: ChartBuilder<DB>);

    /// override this method if you want more freedom of drawing area
    ///
    /// ## Example
    /// ```rust,ignore
    /// use plotters::prelude::*;
    /// use plotters_iced::{Chart,ChartWidget};
    ///
    /// struct MyChart{}
    ///
    /// impl Chart<Message> for MyChart {
    ///     // leave it empty
    ///     fn build_chart<DB: DrawingBackend>(&self, builder: ChartBuilder<DB>){}
    ///     fn draw_chart<DB: DrawingBackend>(&self, root: DrawingArea<DB, Shift>){
    ///          let children = root.split_evenly((3,3));
    ///          for (area, color) in children.into_iter().zip(0..) {
    ///                area.fill(&Palette99::pick(color)).unwrap();
    ///          }
    ///      }
    /// }
    #[inline]
    fn draw_chart<DB: DrawingBackend>(&self, root: DrawingArea<DB, Shift>) {
        let builder = ChartBuilder::on(&root);
        self.build_chart(builder);
    }

    /// draw on [`iced_graphics::canvas::Canvas`]
    ///
    /// override this method if you want to use [`iced_graphics::canvas::Cache`]
    ///
    /// ## Example
    /// ```rust,ignore
    ///  
    /// impl Chart<Message> for CpuUsageChart {
    ///
    ///       #[inline]
    ///       fn draw<F: Fn(&mut Frame)>(&self, bounds: Size, draw_fn: F) -> Geometry {
    ///            self.cache.draw(bounds, draw_fn)
    ///       }
    ///      //...
    /// }
    /// ```
    #[inline]
    fn draw<F: Fn(&mut Frame)>(&self, size: Size, f: F) -> Geometry {
        let mut frame = Frame::new(size);
        f(&mut frame);
        frame.into_geometry()
    }

    #[allow(unused_variables)]
    #[inline]
    fn update(
        &mut self,
        event: Event,
        bounds: Rectangle,
        cursor: Cursor,
    ) -> (Status, Option<Message>) {
        (Status::Ignored, None)
    }
}

#[cfg(target_arch = "wasm32")]
#[doc(hidden)]
pub mod dummy {
    use super::Size;
    pub enum Internal {}
    pub type Cursor = Internal;
    pub type Event = Internal;
    pub enum Status {
        Ignored,
    }
    pub struct Frame;

    impl Frame {
        pub fn new(_size: Size) -> Self {
            Self
        }
        pub fn into_geometry(self) -> Geometry {
            ()
        }
    }

    pub type Geometry = ();
}