/*
 * This file is part of laurelin/client
 * Copyright (C) 2023 Jonni Liljamo <jonni@liljamo.com>
 *
 * Licensed under GPL-3.0-only.
 * See LICENSE for licensing information.
 */

use bevy::{
    prelude::*,
    tasks::{AsyncComputeTaskPool, Task},
};
use bevy_console::PrintConsoleLine;
use iyes_loopless::prelude::*;

use futures_lite::future;

use crate::{
    api::{
        self,
        user::{ResponseRegister, ResponseToken},
    },
    cfg::{CfgDev, CfgUser},
    plugins::config::{SaveEvent, SaveEventValue},
};

use super::MenuState;

pub mod ui;

pub struct AccountRegisterPlugin;

impl Plugin for AccountRegisterPlugin {
    fn build(&self, app: &mut App) {
        app.add_loopless_state(RegisterState::None)
            // UI system
            .insert_resource(ui::InputsUserRegister::new())
            .add_system_set(
                ConditionSet::new()
                    .run_in_state(RegisterState::Input)
                    .with_system(ui::account_register_ui)
                    .into(),
            )
            // Register system, as in calling the API
            .add_enter_system(RegisterState::Registering, start_register_call)
            .add_system_set(
                ConditionSet::new()
                    .run_in_state(RegisterState::Registering)
                    .with_system(handle_register_call)
                    .into(),
            );
    }
}

/// Register State
#[derive(Clone, Eq, PartialEq, Debug, Hash)]
pub enum RegisterState {
    None,
    Input,
    Registering,
}

struct RegisterCallResponse {
    register: ResponseRegister,
    token: ResponseToken,
}

#[derive(Component)]
struct RegisterCall(Task<RegisterCallResponse>);

fn start_register_call(
    mut commands: Commands,
    cfg_dev: Res<CfgDev>,
    inputs: Res<ui::InputsUserRegister>,
) {
    let api_address = cfg_dev.api_server.clone();
    let i = inputs.clone();

    let thread_pool = AsyncComputeTaskPool::get();
    let task = thread_pool.spawn(async move {
        let register_response = api::user::register(
            api_address.clone(),
            i.username.clone(),
            i.email.clone(),
            i.password.clone(),
        );

        // TODO: This is bad, if the above fails, this will too. Or maybe that doesn't matter?
        let token_response =
            api::user::token(api_address.clone(), i.email.clone(), i.password.clone());

        RegisterCallResponse {
            register: register_response,
            token: token_response,
        }
    });
    commands.spawn(RegisterCall(task));
}

fn handle_register_call(
    mut commands: Commands,
    mut register_call_tasks: Query<(Entity, &mut RegisterCall)>,
    mut inputs: ResMut<ui::InputsUserRegister>,
    mut cfg_user: ResMut<CfgUser>,
    mut save_event_writer: EventWriter<SaveEvent>,
    mut console: EventWriter<PrintConsoleLine>,
) {
    let (entity, mut task) = register_call_tasks.single_mut();
    if let Some(register_call_response) = future::block_on(future::poll_once(&mut task.0)) {
        match register_call_response.register {
            ResponseRegister::Valid(register_res) => {
                console.send(PrintConsoleLine::new(
                    format!("Registered user: {}", register_res.username,).into(),
                ));

                match register_call_response.token {
                    ResponseToken::Valid(token_res) => {
                        *cfg_user = CfgUser {
                            logged_in: true,
                            user_token: token_res.token,
                            id: register_res.id,
                            username: register_res.username,
                            email: inputs.email.clone(),
                        };

                        save_event_writer.send(SaveEvent {
                            value: SaveEventValue::User(cfg_user.into_inner().clone()),
                        });

                        commands.insert_resource(NextState(RegisterState::None));
                        commands.insert_resource(NextState(MenuState::AccountLoggedIn));
                    }
                    ResponseToken::Error(error) => {
                        // TODO: Handle? Is it possible to even get here without the server shitting itself between the register and token calls?
                        // And if the server does indeed shit itself between those calls, the user can just login normally, so 🤷‍♀️
                        console.send(PrintConsoleLine::new(format!(
                            "Something went wrong with getting the user token after registering, got error: '{}'", error
                        ).into()));

                        commands.insert_resource(NextState(RegisterState::None));
                        commands.insert_resource(NextState(MenuState::AccountLoggedOut));
                    }
                }
            }
            ResponseRegister::Error(error) => {
                inputs.error = error.error.description;
                commands.insert_resource(NextState(RegisterState::Input));
            }
        }

        // Remove the task, since it's done now
        commands.entity(entity).remove::<RegisterCall>();
        commands.entity(entity).despawn_recursive();
    }
}