//! Seperate out debugging uis/plugins in it's own module for cleanliness.
use bevy::prelude::*;
use bevy_inspector_egui::bevy_egui::EguiPlugin;
use clap::Subcommand;
use console::ConsoleLog;
use util::{console_err, console_log};

use crate::AppState;

mod console;

mod util {
    use bevy::prelude::*;

    use super::DebugEvent;

    pub fn console_log(dbg_writer: &mut EventWriter<DebugEvent>, s: impl Into<String>) {
        dbg_writer.write(DebugEvent::PrintToConsole {
            error: false,
            text: s.into(),
        });
    }

    pub fn console_err(dbg_writer: &mut EventWriter<DebugEvent>, s: impl Into<String>) {
        dbg_writer.write(DebugEvent::PrintToConsole {
            error: false,
            text: s.into(),
        });
    }
}

/// Debug system set.
#[derive(SystemSet, Debug, Clone, PartialEq, Eq, Hash)]
pub struct DebugSet;

pub fn plugin(app: &mut App) {
    app.add_plugins(EguiPlugin {
        enable_multipass_for_primary_context: true,
    })
    .add_systems(Update, start_game.in_set(DebugSet))
    .add_event::<DebugEvent>()
    .add_plugins(console::plugin);
}

#[derive(Event, Debug, Subcommand, PartialEq, Eq)]
enum DebugEvent {
    /// Close the debug console.
    #[command(name = "close", aliases = ["close-console"])]
    CloseDebugConsole,

    /// Output a string to the console.
    #[command(name = "echo", aliases = ["print", "print-to-console"])]
    PrintToConsole {
        /// Print as error
        #[arg(short, long)]
        error: bool,
        /// The text to be printed in the console.
        text: String,
    },

    /// Start the game
    StartGame,
}

fn start_game(
    mut dbg_reader: EventReader<DebugEvent>,
    mut log: ResMut<ConsoleLog>,
    cur_state: Res<State<AppState>>,
    mut next_state: ResMut<NextState<AppState>>,
) {
    for ev in dbg_reader.read() {
        if *ev == DebugEvent::StartGame {
            if *cur_state == AppState::Ingame {
                log.err("Can't start game since it's already started.");
            } else {
                log.write("Starting game...");
                next_state.set(AppState::Ingame);
            }
        }
    }
}