use crate::editor::prelude::*;
use bevy::{
    asset::{AssetLoader, LoadContext, LoadedAsset},
    reflect::{TypePath, TypeUuid},
    ui::FocusPolicy,
    utils::BoxedFuture,
};
use serde::Deserialize;

#[derive(Debug, Component, Default)]
pub struct MonologueWidget;

#[derive(Debug, Deserialize, TypeUuid, TypePath, PartialEq)]
#[uuid = "216a570b-d142-4026-baed-d7feb0250458"]
pub struct Monologue {
    text: String,
}

#[derive(Debug, Event)]
pub enum ControlMonologue {
    Show(Handle<Monologue>),
    Hide,
}

#[derive(Debug, Component)]
pub struct MonologueModal;

#[derive(Debug, Component)]
pub struct MonologueContainer;

#[derive(Default)]
pub struct MonologueLoader;

impl AssetLoader for MonologueLoader {
    fn load<'a>(
        &'a self,
        bytes: &'a [u8],
        load_context: &'a mut LoadContext,
    ) -> BoxedFuture<'a, Result<(), bevy::asset::Error>> {
        Box::pin(async move {
            let asset = Monologue {
                text: String::from_utf8(bytes.to_vec())?,
            };
            load_context.set_default_asset(LoadedAsset::new(asset));
            Ok(())
        })
    }

    fn extensions(&self) -> &[&str] {
        &["monologue.txt"]
    }
}

pub fn init_texts_ui(mut commands: Commands) {
    commands.spawn((
        NodeBundle {
            style: Style {
                width: Val::Percent(100.0),
                align_items: AlignItems::Center,
                justify_content: JustifyContent::Center,
                ..default()
            },
            focus_policy: FocusPolicy::Pass,
            ..default()
        },
        MonologueContainer,
    ));
}

pub fn texts_ui(
    mut events: EventReader<AssetEvent<Monologue>>,
    mut commands: Commands,
    widget: Query<Entity, With<MonologueWidget>>,
    current: Query<(Entity, &ui::TargetAsset<Monologue>)>,
    server: Res<AssetServer>,
) {
    events.iter().for_each(|event| match event {
        AssetEvent::Created { handle } => {
            info!("Monologue created! {:?}", event);
            create_asset_button(
                &widget,
                &mut commands,
                ui::TargetAsset {
                    handle: handle.clone(),
                },
                get_asset_name(&server, handle.clone()),
                None,
            );
        }
        AssetEvent::Removed { handle } => {
            info!("Monologue removed! {:?}", event);
            destroy_asset_button(
                &current,
                &mut commands,
                &ui::TargetAsset {
                    handle: handle.clone(),
                },
            );
        }
        AssetEvent::Modified { handle } => {
            info!("Monologue modified! {:?}", event);
            destroy_asset_button(
                &current,
                &mut commands,
                &ui::TargetAsset {
                    handle: handle.clone(),
                },
            );
            create_asset_button(
                &widget,
                &mut commands,
                ui::TargetAsset {
                    handle: handle.clone(),
                },
                get_asset_name(&server, handle.clone()),
                None,
            );
        }
    });
}

pub fn control_monologue(
    mut events: EventReader<ControlMonologue>,
    monologues: Res<Assets<Monologue>>,
    container: Query<Entity, With<MonologueContainer>>,
    mut commands: Commands,
    font: Res<FontInfo>, // Not convinced we need this...
) {
    events.iter().for_each(|event| match event {
        ControlMonologue::Hide => {
            commands.entity(container.single()).despawn_descendants();
        }
        ControlMonologue::Show(handle) => {
            monologues.get(handle).iter().for_each(|&monologue| {
                commands
                    .entity(container.single())
                    .despawn_descendants()
                    .with_children(|parent| {
                        parent
                            .spawn(NodeBundle {
                                style: Style {
                                    max_width: Val::Percent(50.0),
                                    padding: UiRect::all(Val::Px(1.0)),
                                    margin: UiRect::all(Val::Px(1.0)),
                                    border: UiRect::all(Val::Px(1.0)),
                                    flex_direction: FlexDirection::Column,
                                    ..default()
                                },
                                background_color: Color::WHITE.into(),
                                border_color: Color::BLACK.into(),
                                ..default()
                            })
                            .with_children(|parent| {
                                parent.spawn((
                                    ui::TitleBarBase::new(Color::VIOLET).bundle(),
                                    ui::Title {
                                        text: "Monologue".into(),
                                        ..default()
                                    },
                                    ui::Close {
                                        target: parent.parent_entity(),
                                    },
                                    ui::Sorting(0),
                                ));
                                let style = match &font.default {
                                    Some(handle) => TextStyle {
                                        color: Color::BLACK.into(),
                                        font_size: 16.0,
                                        font: handle.clone(),
                                        ..default()
                                    },
                                    None => TextStyle {
                                        color: Color::BLACK.into(),
                                        font_size: 16.0,
                                        ..default()
                                    },
                                };
                                parent.spawn((
                                    TextBundle::from_section(monologue.text.clone(), style),
                                    handle.clone(),
                                ));
                            });
                    });
            });
        }
    });
}

pub fn ui_control_monologue(
    events: Query<
        (
            &Interaction,
            &ui::TargetAsset<Monologue>,
            Option<&ui::Active>,
        ),
        (With<Button>, Changed<Interaction>),
    >,
    mut writer: EventWriter<ControlMonologue>,
) {
    events
        .iter()
        .filter_map(
            |(interaction, ui::TargetAsset { handle }, active)| match interaction {
                Interaction::Pressed => Some((handle, active)),
                _ => None,
            },
        )
        .for_each(|(handle, active)| match active {
            Some(_) => writer.send(ControlMonologue::Hide),
            None => writer.send(ControlMonologue::Show(handle.clone())),
        });
}

// TODO: Sync Handle<Monologue> and TextStyle components to automagically generate and sync text
pub fn sync_monologue_font(
    mut texts: Query<&mut Text, With<Handle<Monologue>>>,
    font: Res<FontInfo>,
) {
    if font.is_changed() || font.is_added() {
        texts.iter_mut().for_each(|mut text| {
            text.sections
                .iter_mut()
                .for_each(|section| match &font.default {
                    Some(handle) => section.style.font = handle.clone(),
                    None => section.style.font = Handle::default(),
                });
        });
    }
}