use std::str::FromStr;

use super::{ConnectionState, Imgs, Message};

use crate::{
    game_input::GameInput,
    settings::ControlSettings,
    ui::{
        fonts::IcedFonts as Fonts,
        ice::{component::neat_button, style, widget::Image, Element, IcedUi as Ui, Id},
        Graphic,
    },
};
use common::assets::{self, AssetExt};
use i18n::Localization;
use iced::{button, Align, Column, Container, Length, Row, Space, Text};
use serde::{Deserialize, Serialize};

struct LoadingAnimation {
    speed_factor: f32,
    frames: Vec<Id>,
}
impl LoadingAnimation {
    fn new(raw: &(f32, Vec<String>), ui: &mut Ui) -> Self {
        let mut frames = vec![];
        for frame_path in raw.1.iter() {
            if let Ok(image) = assets::Image::load(frame_path) {
                frames.push(ui.add_graphic(Graphic::Image(image.read().to_image(), None)));
            } else {
                frames.push(
                    ui.add_graphic(Graphic::Image(
                        assets::Image::load("voxygen.element.not_found")
                            .unwrap_or_else(|_| panic!("Missing asset '{}'", frame_path))
                            .read()
                            .to_image(),
                        None,
                    )),
                )
            }
        }
        Self {
            speed_factor: raw.0,
            frames,
        }
    }
}

#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
struct LoadingAnimationManifest(Vec<(f32, Vec<String>)>);
impl assets::Asset for LoadingAnimationManifest {
    type Loader = assets::RonLoader;

    const EXTENSION: &'static str = "ron";
}

/// Connecting screen for the main menu
pub struct Screen {
    cancel_button: button::State,
    add_button: button::State,
    tip_number: u16,
    loading_animation: LoadingAnimation,
}

impl Screen {
    pub fn new(ui: &mut Ui) -> Self {
        let animations =
            LoadingAnimationManifest::load("voxygen.element.animation.loaders.manifest")
                .expect(
                    "Missing loader manifest file 'voxygen/element/animation/loaders/manifest.ron'",
                )
                .cloned()
                .0;
        Self {
            cancel_button: Default::default(),
            add_button: Default::default(),
            tip_number: rand::random(),
            loading_animation: LoadingAnimation::new(
                &animations[rand::random::<usize>() % animations.len()],
                ui,
            ),
        }
    }

    pub(super) fn view(
        &mut self,
        fonts: &Fonts,
        imgs: &Imgs,
        connection_state: &ConnectionState,
        time: f64,
        i18n: &Localization,
        button_style: style::button::Style,
        show_tip: bool,
        controls: &ControlSettings,
    ) -> Element<Message> {
        // TODO: add built in support for animated images
        let frame_index = (time * self.loading_animation.speed_factor as f64)
            % self.loading_animation.frames.len() as f64;
        let frame_id = self.loading_animation.frames[frame_index as usize];

        let children = match connection_state {
            ConnectionState::InProgress => {
                let tip = if show_tip {
                    let tip = &i18n.get_variation("loading.tips", self.tip_number);
                    let mut new_tip = String::with_capacity(tip.len());
                    let mut last_index = 0;

                    // This could be done with regex instead, but adding new dependencies is
                    // scary...
                    tip.match_indices("{gameinput.").for_each(|(start, s)| {
                        println!("start {}", start);
                        if let Some(end) = tip[start + s.len()..].find('}') {
                            let end = start + s.len() + end;
                            println!("end {}", end);
                            if let Ok(game_input) = GameInput::from_str(&tip[start + 1..end]) {
                                println!("input {:?}", game_input);
                                new_tip.push_str(&tip[last_index..start]);
                                new_tip.push_str(
                                    controls.keybindings[&game_input]
                                        .display_string(&None)
                                        .as_str(),
                                );
                                last_index = end + 1;
                            }
                        }
                    });
                    // If there is any text left over append it
                    if last_index < tip.len() {
                        new_tip.push_str(&tip[last_index..]);
                    }

                    let tip = format!("{} {}", i18n.get("main.tip"), new_tip.as_str());
                    Container::new(Text::new(tip).size(fonts.cyri.scale(25)))
                        .width(Length::Fill)
                        .height(Length::Fill)
                        .center_x()
                        .align_y(Align::End)
                        .into()
                } else {
                    Space::new(Length::Fill, Length::Fill).into()
                };

                let cancel = Container::new(neat_button(
                    &mut self.cancel_button,
                    i18n.get("common.cancel"),
                    0.7,
                    button_style,
                    Some(Message::CancelConnect),
                ))
                .width(Length::Fill)
                .height(Length::Units(fonts.cyri.scale(30)))
                .center_x()
                .padding(3);

                let tip_cancel = Column::with_children(vec![tip, cancel.into()])
                    .width(Length::FillPortion(3))
                    .align_items(Align::Center)
                    .spacing(5)
                    .padding(5);

                let gear = Container::new(
                    Image::new(frame_id)
                        .width(Length::Units(64))
                        .height(Length::Units(64)),
                )
                .width(Length::Fill)
                .padding(10)
                .align_x(Align::End);

                let bottom_content = Row::with_children(vec![
                    Space::new(Length::Fill, Length::Shrink).into(),
                    tip_cancel.into(),
                    gear.into(),
                ])
                .align_items(Align::Center)
                .width(Length::Fill);

                let left_art = Image::new(imgs.loading_art_l)
                    .width(Length::Units(12))
                    .height(Length::Units(12));
                let right_art = Image::new(imgs.loading_art_r)
                    .width(Length::Units(12))
                    .height(Length::Units(12));

                let bottom_bar = Container::new(Row::with_children(vec![
                    left_art.into(),
                    bottom_content.into(),
                    right_art.into(),
                ]))
                .height(Length::Units(85))
                .style(style::container::Style::image(imgs.loading_art));

                vec![
                    Space::new(Length::Fill, Length::Fill).into(),
                    bottom_bar.into(),
                ]
            },
            ConnectionState::AuthTrustPrompt { msg, .. } => {
                let text = Text::new(msg).size(fonts.cyri.scale(25));

                let cancel = neat_button(
                    &mut self.cancel_button,
                    i18n.get("common.cancel"),
                    0.7,
                    button_style,
                    Some(Message::TrustPromptCancel),
                );
                let add = neat_button(
                    &mut self.add_button,
                    i18n.get("common.add"),
                    0.7,
                    button_style,
                    Some(Message::TrustPromptAdd),
                );

                let content = Column::with_children(vec![
                    text.into(),
                    Container::new(
                        Row::with_children(vec![cancel, add])
                            .spacing(20)
                            .height(Length::Units(25)),
                    )
                    .align_x(Align::End)
                    .width(Length::Fill)
                    .into(),
                ])
                .spacing(4)
                .max_width(520)
                .width(Length::Fill)
                .height(Length::Fill);

                let prompt_window = Container::new(content)
                    .style(
                        style::container::Style::color_with_double_cornerless_border(
                            (22, 18, 16, 255).into(),
                            (11, 11, 11, 255).into(),
                            (54, 46, 38, 255).into(),
                        ),
                    )
                    .padding(20);

                let container = Container::new(prompt_window)
                    .width(Length::Fill)
                    .height(Length::Fill)
                    .center_x()
                    .center_y();

                vec![
                    container.into(),
                    Space::new(Length::Fill, Length::Units(fonts.cyri.scale(15))).into(),
                ]
            },
        };

        Column::with_children(children)
            .width(Length::Fill)
            .height(Length::Fill)
            .into()
    }
}