mod colors;
mod widgets;

use std::f32;

use crate::components::{Camera, Chat, Menu, Player, PlayerResources, SendPacket, Transform};
use crate::ui::widgets::{progress_bar, RichTextExt};
use bevy_ecs::entity::Entity;
use bevy_ecs::event::Events;
use bevy_ecs::prelude::With;
use bevy_ecs::world::World;
use egui::{Align, Align2, CursorIcon, Layout, Margin, Order, RichText, Shadow, Visuals};
use starkingdoms_common::packet::Packet;

pub fn init_ui(ctx: egui::Context) {
    // set colors
    let mut style = egui::Style::default();

    let mut visuals = Visuals::default();
    visuals.dark_mode = true;

    // TODO(core): code_bg_colors

    visuals.warn_fg_color = colors::YELLOW; // used for warning text
    visuals.error_fg_color = colors::RED; // used for error text

    visuals.window_shadow = Shadow::NONE;
    visuals.window_fill = colors::MANTLE; // window background color
    visuals.extreme_bg_color = colors::CRUST; // must be darker than window_fill
    visuals.faint_bg_color = colors::BASE; // slightly different than window background color
    visuals.window_stroke.color = colors::SURFACE_0;
    visuals.window_highlight_topmost = false;

    visuals.text_cursor.stroke.color = colors::ROSEWATER;

    // TODO(core): button_frame, collapsing_header_frame
    visuals.striped = true;

    visuals.interact_cursor = Some(CursorIcon::PointingHand);

    visuals.selection.bg_fill = colors::OVERLAY_2.gamma_multiply(0.2); // selection background

    visuals.hyperlink_color = colors::BLUE;

    visuals.widgets.noninteractive.fg_stroke.color = colors::TEXT; // standard text color

    style.visuals = visuals;

    ctx.set_style(style);
}

pub fn draw_ui(
    ctx: &egui::Context,
    world: &mut World,
    send_packet_events: &mut Events<SendPacket>,
) {
    draw_status_bar(ctx, world);
    draw_chat(ctx, world, send_packet_events);
    draw_crafting(ctx, world);
}

pub fn draw_status_bar(ctx: &egui::Context, world: &mut World) {
    let mut player = world.query_filtered::<&Transform, With<Player>>();
    let player_position = player.single(&world);
    let player_resources = world.resource::<PlayerResources>();

    egui::Window::new("status_bar")
        .title_bar(false)
        .movable(false)
        .resizable(false)
        .order(Order::Foreground)
        .anchor(Align2::CENTER_BOTTOM, [0.0, -5.0])
        .show(ctx, |ui| {
            ui.horizontal(|ui| {
                ui.vertical(|ui| {
                    ui.label(RichText::new("Position:").stk_weak());
                    ui.label(RichText::new(format!(
                        "{:.0}, {:.0}",
                        player_position.translation.x / 10.0,
                        player_position.translation.y / 10.0
                    )))
                });

                ui.add_space(8.0);

                ui.vertical(|ui| {
                    ui.horizontal(|ui| {
                        ui.label(RichText::new("Fuel:").stk_weak());
                        ui.with_layout(Layout::right_to_left(Align::Center), |ui| {
                            ui.label(RichText::new(format!(
                                "{}/{} ({:.2}%)",
                                player_resources.fuel_amount,
                                player_resources.fuel_max,
                                player_resources.fuel_amount as f32
                                    / player_resources.fuel_max as f32
                                    * 100.0
                            )))
                        });
                    });

                    ui.add(progress_bar(
                        player_resources.fuel_amount as f32 / player_resources.fuel_max as f32,
                    ));
                })
            });
        });
}

pub fn draw_chat(
    ctx: &egui::Context,
    world: &mut World,
    send_packet_events: &mut Events<SendPacket>,
) {
    let mut chat = world.get_resource_mut::<Chat>().unwrap();

    egui::Window::new("Chat")
        .movable(true)
        .order(Order::Foreground)
        .show(ctx, |ui| {
            egui::Frame::new()
                .inner_margin(Margin::same(5))
                .corner_radius(2)
                .fill(colors::CRUST)
                .show(ui, |ui| {
                    egui::ScrollArea::vertical()
                        .max_width(f32::INFINITY)
                        .max_height(100.0)
                        .auto_shrink(false)
                        .stick_to_bottom(true)
                        .show(ui, |ui| {
                            for message in &chat.messages {
                                ui.label(message);
                            }
                        });
                });
            ui.horizontal(|ui| {
                let output = egui::TextEdit::singleline(&mut chat.textbox).show(ui);
                if ui.button("Send").clicked()
                    || (ctx.input(|i| i.key_pressed(egui::Key::Enter))
                        && output.response.lost_focus())
                {
                    send_packet_events.send(SendPacket(Packet::SendMessage {
                        target: None,
                        content: chat.textbox.clone(),
                    }));
                    chat.textbox.clear();
                }
            });
        });
}

pub fn draw_crafting(ctx: &egui::Context, world: &mut World) {
    let mut menus = world.query_filtered::<(Entity, &Transform), With<Menu>>();
    let camera = world.resource::<Camera>();
    for (entity, menu) in menus.iter(&world) {
        egui::Window::new("Crafting")
            .id(format!("Crafting{}", entity.index()).into())
            .pivot(Align2::LEFT_BOTTOM)
            .fixed_pos((
                (menu.translation.x + camera.x) * camera.zoom + camera.width as f32 / 2.0,
                (menu.translation.y + camera.y) * camera.zoom + camera.height as f32 / 2.0,
            ))
            .show(ctx, |ui| {});
    }
}