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use std::cell::RefCell;

use geom::{Distance, Polygon, Pt2D};
use map_model::{LaneType, Map, Road, RoadID};
use widgetry::{Drawable, GeomBatch, GfxCtx, Line, Text};

use crate::render::{DrawOptions, Renderable};
use crate::{AppLike, ID};

pub struct DrawRoad {
    pub id: RoadID,
    zorder: isize,

    draw_center_line: RefCell<Option<Drawable>>,
    label: RefCell<Option<Drawable>>,
}

impl DrawRoad {
    pub fn new(r: &Road) -> DrawRoad {
        DrawRoad {
            id: r.id,
            zorder: r.zorder,
            draw_center_line: RefCell::new(None),
            label: RefCell::new(None),
        }
    }

    pub fn clear_rendering(&mut self) {
        *self.draw_center_line.borrow_mut() = None;
        *self.label.borrow_mut() = None;
    }
}

impl Renderable for DrawRoad {
    fn get_id(&self) -> ID {
        ID::Road(self.id)
    }

    fn draw(&self, g: &mut GfxCtx, app: &dyn AppLike, _: &DrawOptions) {
        let mut draw_center_line = self.draw_center_line.borrow_mut();
        if draw_center_line.is_none() {
            let mut batch = GeomBatch::new();
            let r = app.map().get_r(self.id);
            // TODO Need to detangle how road_center_line is used.
            let center_color = if app.cs().solid_road_center() {
                app.cs().general_road_marking(r.get_rank())
            } else {
                app.cs().road_center_line(r.get_rank())
            };
            let color = if r.is_private() {
                center_color.lerp(app.cs().private_road, 0.5)
            } else {
                center_color
            };

            // Draw a center line every time two driving/bike/bus lanes of opposite direction are
            // adjacent.
            let mut width = Distance::ZERO;
            for pair in r.lanes_ltr().windows(2) {
                let ((l1, dir1, lt1), (_, dir2, lt2)) = (pair[0], pair[1]);
                width += app.map().get_l(l1).width;
                if dir1 != dir2 && lt1.is_for_moving_vehicles() && lt2.is_for_moving_vehicles() {
                    let pl = r.get_left_side(app.map()).must_shift_right(width);
                    if app.cs().solid_road_center() {
                        batch.push(color, pl.make_polygons(Distance::meters(0.25)));
                    } else {
                        batch.extend(
                            color,
                            pl.dashed_lines(
                                Distance::meters(0.25),
                                Distance::meters(2.0),
                                Distance::meters(1.0),
                            ),
                        );
                    }
                }
            }
            *draw_center_line = Some(g.prerender.upload(batch));
        }
        g.redraw(draw_center_line.as_ref().unwrap());

        // Lazily calculate
        let mut label = self.label.borrow_mut();
        if label.is_none() {
            let mut batch = GeomBatch::new();
            let r = app.map().get_r(self.id);
            if !r.is_light_rail() {
                let name = r.get_name(app.opts().language.as_ref());
                if r.center_pts.length() >= Distance::meters(30.0) && name != "???" {
                    // TODO If it's definitely straddling bus/bike lanes, change the color? Or
                    // even easier, just skip the center lines?
                    let center_color = app.cs().road_center_line(r.get_rank());
                    let fg = if r.is_private() {
                        center_color.lerp(app.cs().private_road, 0.5)
                    } else {
                        center_color
                    };
                    let bg = if r.is_private() {
                        app.cs()
                            .zoomed_road_surface(LaneType::Driving, r.get_rank())
                            .lerp(app.cs().private_road, 0.5)
                    } else {
                        app.cs()
                            .zoomed_road_surface(LaneType::Driving, r.get_rank())
                    };

                    if false {
                        // TODO Not ready yet
                        batch.append(Line(name).fg(fg).render_curvey(
                            g.prerender,
                            &r.center_pts,
                            0.1,
                        ));
                    } else {
                        let txt = Text::from(Line(name).fg(fg)).bg(bg);
                        let (pt, angle) = r.center_pts.must_dist_along(r.center_pts.length() / 2.0);
                        batch.append(
                            txt.render_to_batch(g.prerender)
                                .scale(0.1)
                                .centered_on(pt)
                                .rotate(angle.reorient()),
                        );
                    }
                }
            }
            *label = Some(g.prerender.upload(batch));
        }
        // TODO Covered up sometimes. We could fork and force a different z value...
        g.redraw(label.as_ref().unwrap());
    }

    fn get_outline(&self, map: &Map) -> Polygon {
        // Highlight the entire thing, not just an outline
        map.get_r(self.id).get_thick_polygon(map)
    }

    fn contains_pt(&self, pt: Pt2D, map: &Map) -> bool {
        map.get_r(self.id).get_thick_polygon(map).contains_pt(pt)
    }

    fn get_zorder(&self) -> isize {
        self.zorder
    }
}