use bevy::math::{Vec3Swizzles, Mat2};
use bevy::prelude::*;
use bevy_egui::{egui, EguiContext};
use bevy_prototype_lyon::prelude::Path;
use crate::*;

pub fn action_bar_sys(
    mut egui_ctx: ResMut<EguiContext>,
    mut state: ResMut<UiState>,
    colors: Res<ButtonsColors>,
) {
    egui::Window::new("buttons_float")
        .default_pos((20.0, 20.0))
        .title_bar(false)
        .resizable(false)
        .show(egui_ctx.ctx_mut(), |ui| {
            ui.horizontal(|hui| {
                let m = hui.button(egui::RichText::new("M").color(state.current_action_color(&colors, Action::Modify)))
                    .on_hover_text("Modify");
                if m.clicked() {
                    state.current_action = Action::Modify;
                }
                let r = hui.button(egui::RichText::new("R").color(state.current_action_color(&colors, Action::Rotate)))
                    .on_hover_text("Rotate");
                if r.clicked() {
                    state.current_action = Action::Rotate;
                }
                let c = hui.button(egui::RichText::new("C").color(state.current_action_color(&colors, Action::Create)))
                    .on_hover_text("Create");
                if c.clicked() {
                    state.current_action = Action::Create;
                }
                hui.label(" | ");

                if hui.button(" I ").on_hover_text("Import Image").clicked() {
                    println!("Importing Images is still not supported!");
                }

                hui.label(": :");
            });

            if state.current_action == Action::Create {
                ui.horizontal(|hui| {
                    let tri = hui.button(egui::RichText::new("Tri").color(state.create_shape_color(&colors, CreateShape::Triangle)))
                        .on_hover_text("Triangle - from 3 edges");
                    if tri.clicked() {
                        state.create_shape = CreateShape::Triangle;
                    }
                    let squ = hui.button(egui::RichText::new("Squ").color(state.create_shape_color(&colors, CreateShape::Square)))
                        .on_hover_text("Square - from 2 opposing edges");
                    if squ.clicked() {
                        state.create_shape = CreateShape::Square;
                    }
                    let cir = hui.button(egui::RichText::new("Cir").color(state.create_shape_color(&colors, CreateShape::Circle)))
                        .on_hover_text("Circle - center point and radius");
                    if cir.clicked() {
                        state.create_shape = CreateShape::Circle;
                    }
                    // let cap = hui.button(egui::RichText::new("Cap").color(state.create_shape_color(&colors, CreateShape::Capsule)))
                    //     .on_hover_text("Capsule - from 2 center points and a radius");
                    // if cap.clicked() {
                    //     state.create_shape = CreateShape::Capsule;
                    // }
                });
            }
        });
}

pub fn shape_tree_sys(
    mut name_change: Local<Option<(Entity, String)>>,
    mut coms: Commands,
    mut egui_ctx: ResMut<EguiContext>,
    mut shapes: Query<(Entity, &mut ShapeData)>,
    mut transforms: Query<&mut Transform>,
    global_transforms: Query<&GlobalTransform>,
    mut paths: Query<&mut Path>,
) {
    if !shapes.is_empty() {
        egui::Window::new("Shape Tree")
        .default_pos((10.0, 100.0))
        .title_bar(true)
        .resizable(false)
        .show(egui_ctx.ctx_mut(), |ui| {
            for (e, mut sd) in shapes.iter_mut () {
                ui.push_id(e.id(), |ui| {
                    let ui_func = |ui: &mut egui::Ui| {
                        if let Ok(mut t) = transforms.get_mut(sd.main_shape) {
                            ui.horizontal(|hui| {
                                hui.label("Translation:");
                                hui.add(egui::DragValue::new(&mut t.translation.x));
                                hui.add(egui::DragValue::new(&mut t.translation.y)); 
                            });
                            ui.horizontal(|hui| {
                                hui.label("Rotation:");
                                let mut rot = t.rotation.to_euler(EulerRot::XYZ).2.to_degrees();
                                if hui.add(egui::DragValue::new(&mut rot).suffix("°")).changed() {
                                    t.rotation = Quat::from_rotation_z(rot.to_radians());
                                }
                            });
                        }
                        for (i, edge) in sd.edges.iter().enumerate() {
                            ui.horizontal(|hui| {
                                hui.label(format!("Edge {}", i));
                                let gt = global_transforms.get(*edge).unwrap();
                                let mut gt_x = gt.translation.x;
                                let mut gt_y = gt.translation.y;
                                let c1 = hui.add(egui::DragValue::new(&mut gt_x)).changed();
                                let c2 = hui.add(egui::DragValue::new(&mut gt_y)).changed();

                                if c1 || c2 {
                                    let ang = gt.rotation.to_euler(EulerRot::XYZ).2;
                                    let delta = Mat2::from_angle(-ang) * (Vec2::new(gt_x, gt_y) - gt.translation.xy());
                                    if let Ok(mut t) = transforms.get_mut(*edge) {
                                        t.translation += delta.extend(0.0);
                                    }
                                    // We need to recalculate the center, and update the points to be the new relevant point from the center
                                    let center_offset = modify::calc_shape_center_offset(&transforms, &*sd);
                                    // Update each edge's offset, and then move the main shape's translation
                                    for edge in sd.edges.iter() {
                                        if let Ok(mut t) = transforms.get_mut(*edge) {
                                            t.translation -= center_offset.extend(0.0);
                                        }
                                    }
                                    if let Ok(mut t) = transforms.get_mut(sd.main_shape) {
                                        t.translation += (Mat2::from_angle(ang) * center_offset).extend(0.0);
                                    }

                                    // Now we need to update the shape itself
                                    modify::update_main_shape(&mut paths, &transforms, &*sd);
                                }
                            });
                        }
                    };
                    if let Some((sde, name)) = &mut *name_change && *sde == e {
                        // Changing the current shape's name
                        let te = egui::TextEdit::singleline(name).desired_width(100.0);

                        if ui.add(te).lost_focus() {
                            let (_, name) = name_change.take().unwrap();
                            sd.name = Some(name);
                        }
                    }
                    else {
                        let default_name = format!("{:?}", sd.shape);
                        ui.horizontal(|hui| {
                            let closed = hui.collapsing(sd.name.as_ref().unwrap_or(&default_name), ui_func).fully_closed();
                            if closed && hui.button("E").clicked() {
                                *name_change = Some((e, default_name));
                            }
                            if closed && hui.button("D").clicked() {
                                coms.entity(sd.main_shape).despawn_recursive();
                                coms.entity(e).despawn();
                            }
                        });
                    }
                });
            }
        });
    }
}