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#![recursion_limit = "256"]

//! This module provides the render environment.
//!
//! OrbTk has choosen the [tinyskia] crate to handle all 2D rendering
//! tasks. Implemented as wrapper functions, it consumes the native
//! rendering functions provided from tinyskia.
//!
//! [tinyskia]: https://docs.rs/tiny-skia

use std::{any::Any, fmt};

/// Pre-selects commonly used OrbTk crates and put them into scope.
pub mod prelude;

/// Handles helper utilities and global methods.
pub use orbtk_utils::prelude as utils;

mod common;

pub use tinyskia::*;

pub mod tinyskia;

pub use self::render_target::*;

mod render_target;

/// Defines the current configuration of the render ctx.
#[derive(Debug, Clone)]
pub struct RenderConfig {
    pub fill_style: utils::Brush,
    pub stroke_style: utils::Brush,
    pub line_width: f64,
    pub font_config: FontConfig,
    pub alpha: f32,
}

impl Default for RenderConfig {
    fn default() -> Self {
        RenderConfig {
            fill_style: utils::Brush::default(),
            stroke_style: utils::Brush::default(),
            line_width: 1.,
            font_config: FontConfig::default(),
            alpha: 1.,
        }
    }
}

/// The TextMetrics struct represents the dimension of a text.
#[derive(Clone, Copy, Default, Debug)]
pub struct TextMetrics {
    pub width: f64,
    pub height: f64,
}

/// Internal font helper.
#[derive(Default, Clone, PartialEq, Debug)]
pub struct FontConfig {
    pub family: String,
    pub font_size: f64,
}

impl ToString for FontConfig {
    fn to_string(&self) -> String {
        format!("{}px {}", self.font_size, self.family)
    }
}

// Handle render pipeline tasks.
pub trait RenderPipeline {
    /// Draws the ctx of the pipeline.
    fn draw(&self, image: &mut RenderTarget);
}

/// Used to implement a custom render pipeline.
pub trait PipelineTrait: RenderPipeline + Any + Send {
    /// Equality for two Pipeline objects.
    fn box_eq(&self, other: &dyn Any) -> bool;

    /// Converts self to an any reference.
    fn as_any(&self) -> &dyn Any;

    /// Clones self as box.
    fn clone_box(&self) -> Box<dyn PipelineTrait>;

    /// Draws the ctx of the pipeline.
    fn draw_pipeline(&self, image: &mut RenderTarget) {
        self.draw(image);
    }
}

impl PartialEq for Box<dyn PipelineTrait> {
    fn eq(&self, other: &Box<dyn PipelineTrait>) -> bool {
        self.box_eq(other.as_any())
    }
}

impl Clone for Box<dyn PipelineTrait> {
    fn clone(&self) -> Self {
        self.clone_box()
    }
}

impl fmt::Debug for Box<dyn PipelineTrait> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "Box<dyn PipelineTrait>")
    }
}