use svg::{
    node::element::{path::Data as PathData, Path},
    Document,
};
use usvg::Tree;

pub const HOUR_NAMES: [&str; 24] = [
    "Candle", "Ice", "Comet", "Thimble", "Root", "Mist", "Sprout", "Rainbow", "Worm", "Bud",
    "Blossom", "Ladybug", "Geese", "Dust", "Peach", "Fog", "Acorn", "Gourd", "Soup", "Crow",
    "Mushroom", "Thunder", "Frost", "Lantern",
];
pub const IMAGE_WIDTH: u32 = 700;
pub const HOUR_NAME_FONT_SIZE: f32 = IMAGE_WIDTH as f32 * 0.019109;
pub const OUTER_R: f32 = (IMAGE_WIDTH as f32) / 2.0 - 3.0 * HOUR_NAME_FONT_SIZE;
pub const RING_WIDTH: f32 = HOUR_NAME_FONT_SIZE * 3.0;

pub fn svg_to_usvg(document: Document) -> Tree {
    let doc_str = document.to_string();

    let mut opt = usvg::Options::default();
    opt.fontdb.load_system_fonts();
    opt.font_family = "Liberation Serif".to_string();

    Tree::from_str(&doc_str, &opt.to_ref()).unwrap()
}

pub fn hour_name_path() -> Path {
    let radius = OUTER_R - RING_WIDTH / 2.0;
    let delta_x = radius * (15.0_f32.to_radians() / 2.0).sin();
    let delta_y = radius * (1.0 - (15.0_f32.to_radians() / 2.0).cos());
    let x1 = (IMAGE_WIDTH as f32) / 2.0 - delta_x;
    let y1 = ((IMAGE_WIDTH as f32) / 2.0 - radius) + delta_y;

    let path_data = PathData::new().move_to((x1, y1)).elliptical_arc_by((
        radius,
        radius,
        15,
        0,
        1,
        2.0 * delta_x,
        0,
    ));

    Path::new().set("id", "hour-name-path").set("d", path_data)
}