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use map_gui::render::Renderable;
use map_gui::ID;
use map_model::{EditCmd, LaneID, LaneType, Map};
use widgetry::{
    Choice, Color, ControlState, EventCtx, GfxCtx, HorizontalAlignment, Key, Line, Panel,
    SimpleState, State, StyledButtons, TextExt, VerticalAlignment, Widget,
};

use crate::app::App;
use crate::app::Transition;
use crate::common::CommonState;
use crate::edit::zones::ZoneEditor;
use crate::edit::{
    apply_map_edits, can_edit_lane, maybe_edit_intersection, speed_limit_choices, try_change_lt,
};
use crate::sandbox::GameplayMode;

pub struct LaneEditor {
    l: LaneID,
    mode: GameplayMode,
}

impl LaneEditor {
    pub fn new(
        ctx: &mut EventCtx,
        app: &App,
        l: LaneID,
        mode: GameplayMode,
    ) -> Box<dyn State<App>> {
        let mut row = Vec::new();
        let current_lt = app.primary.map.get_l(l).lane_type;
        for (icon, label, key, lt) in vec![
            (
                "driving",
                "convert to a driving lane",
                Key::D,
                LaneType::Driving,
            ),
            (
                "bike",
                "convert to a protected bike lane",
                Key::B,
                LaneType::Biking,
            ),
            ("bus", "convert to a bus-only lane", Key::T, LaneType::Bus),
            (
                "parking",
                "convert to an on-street parking lane",
                Key::P,
                LaneType::Parking,
            ),
            (
                "construction",
                "close for construction",
                Key::C,
                LaneType::Construction,
            ),
        ] {
            row.push(
                ctx.style()
                    .btn_plain_icon(&format!("system/assets/edit/{}.svg", icon))
                    .hotkey(key)
                    .disabled(current_lt == lt)
                    .build_widget(ctx, label),
            );
        }

        let parent = app.primary.map.get_parent(l);
        let col = vec![
            Widget::row(vec![
                Line(format!("Editing {}", l)).small_heading().draw(ctx),
                ctx.style()
                    .btn_plain_text("+ Edit multiple")
                    .label_color(Color::hex("#4CA7E9"), ControlState::Default)
                    .hotkey(Key::M)
                    .build_widget(ctx, "Edit multiple lanes"),
            ]),
            "Type of lane".draw_text(ctx),
            Widget::custom_row(row).centered(),
            ctx.style()
                .btn_outline_text("reverse direction")
                .hotkey(Key::F)
                .build_def(ctx),
            {
                let mut choices = speed_limit_choices(app);
                if !choices.iter().any(|c| c.data == parent.speed_limit) {
                    choices.push(Choice::new(
                        parent.speed_limit.to_string(&app.opts.units),
                        parent.speed_limit,
                    ));
                }
                Widget::row(vec![
                    "Change speed limit:".draw_text(ctx).centered_vert(),
                    Widget::dropdown(ctx, "speed limit", parent.speed_limit, choices),
                ])
            },
            ctx.style()
                .btn_outline_text("Change access restrictions")
                .hotkey(Key::A)
                .build_def(ctx),
            ctx.style()
                .btn_solid_primary_text("Finish")
                .hotkey(Key::Escape)
                .build_def(ctx),
        ];
        let panel = Panel::new(Widget::col(col))
            .aligned(HorizontalAlignment::Center, VerticalAlignment::Top)
            .build(ctx);

        SimpleState::new(panel, Box::new(LaneEditor { l, mode }))
    }
}

impl SimpleState<App> for LaneEditor {
    fn on_click(&mut self, ctx: &mut EventCtx, app: &mut App, x: &str, _: &Panel) -> Transition {
        match x {
            "Edit multiple lanes" => Transition::Replace(crate::edit::bulk::BulkSelect::new(
                ctx,
                app,
                app.primary.map.get_l(self.l).parent,
            )),
            "Change access restrictions" => Transition::Push(ZoneEditor::new(
                ctx,
                app,
                app.primary.map.get_l(self.l).parent,
            )),
            "Finish" => Transition::Pop,
            x => {
                let map = &mut app.primary.map;
                let result = match x {
                    "reverse direction" => Ok(reverse_lane(map, self.l)),
                    "convert to a driving lane" => {
                        try_change_lt(ctx, map, self.l, LaneType::Driving)
                    }
                    "convert to a protected bike lane" => {
                        try_change_lt(ctx, map, self.l, LaneType::Biking)
                    }
                    "convert to a bus-only lane" => try_change_lt(ctx, map, self.l, LaneType::Bus),
                    "convert to an on-street parking lane" => {
                        try_change_lt(ctx, map, self.l, LaneType::Parking)
                    }
                    "close for construction" => {
                        try_change_lt(ctx, map, self.l, LaneType::Construction)
                    }
                    _ => unreachable!(),
                };
                match result {
                    Ok(cmd) => {
                        let mut edits = map.get_edits().clone();
                        edits.commands.push(cmd);
                        apply_map_edits(ctx, app, edits);

                        Transition::Replace(LaneEditor::new(ctx, app, self.l, self.mode.clone()))
                    }
                    Err(err) => Transition::Push(err),
                }
            }
        }
    }

    fn panel_changed(
        &mut self,
        ctx: &mut EventCtx,
        app: &mut App,
        panel: &Panel,
    ) -> Option<Transition> {
        let mut edits = app.primary.map.get_edits().clone();
        edits.commands.push(app.primary.map.edit_road_cmd(
            app.primary.map.get_l(self.l).parent,
            |new| {
                new.speed_limit = panel.dropdown_value("speed limit");
            },
        ));
        apply_map_edits(ctx, app, edits);
        Some(Transition::Replace(LaneEditor::new(
            ctx,
            app,
            self.l,
            self.mode.clone(),
        )))
    }

    fn on_mouseover(&mut self, ctx: &mut EventCtx, app: &mut App) {
        app.recalculate_current_selection(ctx);
        app.recalculate_current_selection(ctx);
        if match app.primary.current_selection {
            Some(ID::Lane(l)) => !can_edit_lane(&self.mode, l, app),
            Some(ID::Intersection(i)) => {
                !self.mode.can_edit_stop_signs() && app.primary.map.maybe_get_stop_sign(i).is_some()
            }
            _ => true,
        } {
            app.primary.current_selection = None;
        }
    }

    fn other_event(&mut self, ctx: &mut EventCtx, app: &mut App) -> Transition {
        ctx.canvas_movement();
        if let Some(l) = app.click_on_lane(ctx, "edit this lane") {
            return Transition::Replace(LaneEditor::new(ctx, app, l, self.mode.clone()));
        }
        if let Some(ID::Intersection(id)) = app.primary.current_selection {
            if let Some(state) = maybe_edit_intersection(ctx, app, id, &self.mode) {
                return Transition::Replace(state);
            }
        }

        Transition::Keep
    }

    fn draw(&self, g: &mut GfxCtx, app: &App) {
        g.draw_polygon(
            app.cs.perma_selected_object,
            app.primary
                .draw_map
                .get_l(self.l)
                .get_outline(&app.primary.map),
        );
        CommonState::draw_osd(g, app);
    }
}

// Allow doing this anywhere. Players can create really wacky roads with many direction changes,
// but it's not really useful to limit creativity. ;)
fn reverse_lane(map: &Map, l: LaneID) -> EditCmd {
    let r = map.get_parent(l);
    let idx = r.offset(l);
    map.edit_road_cmd(r.id, |new| {
        new.lanes_ltr[idx].1 = new.lanes_ltr[idx].1.opposite();
    })
}