//! Display a horizontal or vertical rule for dividing content.

use crate::{Backend, Primitive, Renderer};
use iced_native::mouse;
use iced_native::rule;
use iced_native::{Background, Color, Rectangle};

pub use iced_style::rule::{FillMode, Style, StyleSheet};

/// Display a horizontal or vertical rule for dividing content.
///
/// This is an alias of an `iced_native` rule with an `iced_graphics::Renderer`.
pub type Rule<Backend> = iced_native::Rule<Renderer<Backend>>;

impl<B> rule::Renderer for Renderer<B>
where
    B: Backend,
{
    type Style = Box<dyn StyleSheet>;

    fn draw(
        &mut self,
        bounds: Rectangle,
        style_sheet: &Self::Style,
        is_horizontal: bool,
    ) -> Self::Output {
        let style = style_sheet.style();

        let line = if is_horizontal {
            let line_y = (bounds.y + (bounds.height / 2.0)
                - (style.width as f32 / 2.0))
                .round();

            let (line_x, line_width) = match style.fill_mode {
                FillMode::Full => (bounds.x, bounds.width),
                FillMode::Percent(percent) => {
                    if percent >= 100.0 {
                        (bounds.x, bounds.width)
                    } else {
                        let percent_width =
                            (bounds.width * percent / 100.0).round();

                        (
                            bounds.x
                                + ((bounds.width - percent_width) / 2.0)
                                    .round(),
                            percent_width,
                        )
                    }
                }
                FillMode::Padded(padding) => {
                    if padding == 0 {
                        (bounds.x, bounds.width)
                    } else {
                        let padding = padding as f32;
                        let mut line_width = bounds.width - (padding * 2.0);
                        if line_width < 0.0 {
                            line_width = 0.0;
                        }

                        (bounds.x + padding, line_width)
                    }
                }
                FillMode::AsymmetricPadding(first_pad, second_pad) => {
                    let first_pad = first_pad as f32;
                    let second_pad = second_pad as f32;
                    let mut line_width = bounds.width - first_pad - second_pad;
                    if line_width < 0.0 {
                        line_width = 0.0;
                    }

                    (bounds.x + first_pad, line_width)
                }
            };

            Primitive::Quad {
                bounds: Rectangle {
                    x: line_x,
                    y: line_y,
                    width: line_width,
                    height: style.width as f32,
                },
                background: Background::Color(style.color),
                border_radius: style.radius,
                border_width: 0,
                border_color: Color::TRANSPARENT,
            }
        } else {
            let line_x = (bounds.x + (bounds.width / 2.0)
                - (style.width as f32 / 2.0))
                .round();

            let (line_y, line_height) = match style.fill_mode {
                FillMode::Full => (bounds.y, bounds.height),
                FillMode::Percent(percent) => {
                    if percent >= 100.0 {
                        (bounds.y, bounds.height)
                    } else {
                        let percent_height =
                            (bounds.height * percent / 100.0).round();

                        (
                            bounds.y
                                + ((bounds.height - percent_height) / 2.0)
                                    .round(),
                            percent_height,
                        )
                    }
                }
                FillMode::Padded(padding) => {
                    if padding == 0 {
                        (bounds.y, bounds.height)
                    } else {
                        let padding = padding as f32;
                        let mut line_height = bounds.height - (padding * 2.0);
                        if line_height < 0.0 {
                            line_height = 0.0;
                        }

                        (bounds.y + padding, line_height)
                    }
                }
                FillMode::AsymmetricPadding(first_pad, second_pad) => {
                    let first_pad = first_pad as f32;
                    let second_pad = second_pad as f32;
                    let mut line_height =
                        bounds.height - first_pad - second_pad;
                    if line_height < 0.0 {
                        line_height = 0.0;
                    }

                    (bounds.y + first_pad, line_height)
                }
            };

            Primitive::Quad {
                bounds: Rectangle {
                    x: line_x,
                    y: line_y,
                    width: style.width as f32,
                    height: line_height,
                },
                background: Background::Color(style.color),
                border_radius: style.radius,
                border_width: 0,
                border_color: Color::TRANSPARENT,
            }
        };

        (line, mouse::Interaction::default())
    }
}