//! Character creation scene.
//!
//! Layout / picker UI lives in [`ui`]; presets and the editable draft
//! resource live in [`params`]. This module wires the Bevy plugin, owns the
//! spawn / despawn lifecycle, and handles the Escape → Galaxy shortcut.
//!
//! Persistence is not yet wired up — on Confirm, the current draft is logged
//! and the app transitions to [`AppState::StartingBaseSelection`]. The TODO is
//! to persist it to SpacetimeDB once the Rust SDK is integrated.

mod params;
mod ui;

// Public API surface for the (yet-to-be-wired) persistence layer / InGame
// plugin. Currently unused outside this module — `#[allow]` keeps the names
// exported so consumers can `use crate::gameplay::character_creation::Origin`
// without us remembering to re-add the re-export the day they're needed.
#[allow(unused_imports)]
pub use params::{CharacterDraft, Origin, StartingShip, STARTING_SHIPS};

use bevy::prelude::*;

use crate::state::AppState;

pub struct CharacterCreationPlugin;

impl Plugin for CharacterCreationPlugin {
    fn build(&self, app: &mut App) {
        app.init_resource::<CharacterDraft>()
            .add_systems(
                OnEnter(AppState::CharacterCreation),
                ui::setup_character_creation_ui,
            )
            .add_systems(
                OnExit(AppState::CharacterCreation),
                despawn_character_creation,
            )
            .add_systems(
                Update,
                (
                    escape_to_galaxy,
                    ui::scroll_character_creation_form,
                    ui::picker_button_handler,
                    ui::refresh_picker_values,
                    ui::action_button_handler,
                )
                    .chain()
                    .run_if(in_state(AppState::CharacterCreation)),
            );
    }
}

// ── Markers ─────────────────────────────────────────────────────────────────

/// Tag for everything spawned during character creation so it can be cleanly
/// despawned on state exit.
#[derive(Component)]
pub struct CharacterCreationSpawned;

#[derive(Component)]
pub enum CharacterCreationButton {
    /// Finalize the character and begin the game.
    Confirm,
    /// Discard and return to the galaxy selection screen.
    Back,
}

// ── Lifecycle ───────────────────────────────────────────────────────────────

fn despawn_character_creation(
    mut commands: Commands,
    query: Query<Entity, With<CharacterCreationSpawned>>,
) {
    for entity in &query {
        // Bevy 0.16: despawn() is recursive by default.
        commands.entity(entity).despawn();
    }
}

// ── Input ───────────────────────────────────────────────────────────────────

fn escape_to_galaxy(keys: Res<ButtonInput<KeyCode>>, mut next_state: ResMut<NextState<AppState>>) {
    if keys.just_pressed(KeyCode::Escape) {
        next_state.set(AppState::Galaxy);
    }
}