class GameScene extends Phaser.Scene {
    create() {
        // Physics sprite (dynamic body, affected by gravity)
        this.player = this.physics.add.sprite(100, 300, 'player');
        this.player.setCollideWorldBounds(true);
        this.player.setBounce(0.2);

        // Static group (immovable platforms)
        this.platforms = this.physics.add.staticGroup();
        this.platforms.create(400, 568, 'ground').setScale(2).refreshBody();

        // Register a persistent collider (checked every frame automatically)
        this.physics.add.collider(this.player, this.platforms);

        this.cursors = this.input.keyboard.createCursorKeys();
    }

    update() {
        if (this.cursors.left.isDown) {
            this.player.setVelocityX(-160);
        } else if (this.cursors.right.isDown) {
            this.player.setVelocityX(160);
        } else {
            this.player.setVelocityX(0);
        }
    }
}

// Enable Arcade Physics in game config
const config = {
    type: Phaser.AUTO,
    width: 800,
    height: 600,
    physics: {
        default: 'arcade',
        arcade: {
            gravity: { y: 300 },
            debug: false
        }
    },
    scene: GameScene
};

const game = new Phaser.Game(config);

// Add a physics body to any existing Game Object
this.physics.add.existing(mySprite);           // dynamic body
this.physics.add.existing(mySprite, true);     // static body

// Or enable via the world directly
this.physics.world.enable(mySprite);           // dynamic
this.physics.world.enable(mySprite, Phaser.Physics.Arcade.STATIC_BODY);

// Via the physics factory (this.physics.add)
const player = this.physics.add.sprite(100, 200, 'player');     // dynamic body
const coin = this.physics.add.image(300, 100, 'coin');          // dynamic body
const wall = this.physics.add.staticImage(400, 300, 'wall');    // static body
const platform = this.physics.add.staticSprite(400, 500, 'plat'); // static body

// Standalone bodies (no Game Object)
const sensor = this.physics.add.body(200, 200, 32, 32);        // dynamic Body
const zone = this.physics.add.staticBody(100, 100, 64, 64);    // static Body

// Direct velocity
player.setVelocity(200, -300);          // x=200 px/s, y=-300 px/s (upward)
player.setVelocityX(200);
player.body.velocity.set(200, -300);    // equivalent via Vector2

// Acceleration + max velocity
player.setAcceleration(100, 0);
player.setMaxVelocity(300, 600);

// Per-body gravity (added to world gravity)
player.body.gravity.y = 200;
player.body.allowGravity = false;       // exempt from world gravity

// Drag (applied only when acceleration is zero)
player.setDrag(300);                    // linear deceleration
player.body.useDamping = true;
player.setDrag(0.05);                   // damping mode: keeps 5% velocity/sec

// Bounce
player.setBounce(0.5);                  // both axes
player.setBounceY(1);                   // full vertical bounce

// --- Persistent Colliders (preferred) ---
// Created via this.physics.add.collider / this.physics.add.overlap
// Automatically checked every physics step

const collider = this.physics.add.collider(player, platforms);
const overlap = this.physics.add.overlap(player, coins, collectCoin, null, this);

function collectCoin (player, coin) {
    coin.disableBody(true, true); // disable physics and hide
}

// Collider management
collider.active = false;   // temporarily disable
collider.destroy();        // remove permanently

// With processCallback (must return boolean to allow collision)
this.physics.add.collider(player, enemies, onHit, canCollide, this);
function canCollide (player, enemy) {
    return !player.getData('invincible');
}

// --- One-shot checks (in update) ---
// Called manually each frame; no Collider object created

this.physics.collide(player, platforms);
this.physics.overlap(player, coins, collectCoin, null, this);

// Self-collision within a single group
this.physics.add.collider(enemies, enemies);

// Dynamic physics group -- members get dynamic bodies automatically
const bullets = this.physics.add.group({
    classType: Phaser.Physics.Arcade.Sprite,  // default: ArcadeSprite
    maxSize: 20,
    collideWorldBounds: true,
    bounceX: 1,
    bounceY: 1,
    velocityX: 200,
    velocityY: 0,
    allowGravity: false,
    immovable: false
});

// Static physics group -- members get static bodies
const platforms = this.physics.add.staticGroup();
platforms.create(400, 568, 'ground');
platforms.create(600, 400, 'ground');

// After modifying a static group member's transform, refresh:
platforms.create(400, 568, 'ground').setScale(2).refreshBody();

// Group velocity helpers
bullets.setVelocity(200, 0);       // all members
bullets.setVelocityX(200);
bullets.setVelocityY(0, 10);       // with step increment per member

// Set bounds size and which edges collide (left, right, up, down)
this.physics.world.setBounds(0, 0, 1600, 1200, true, true, false, true);
this.physics.world.setBoundsCollision(true, true, false, true); // edges only

// Per-body world bounds
player.setCollideWorldBounds(true);
player.body.setBoundsRectangle(new Phaser.Geom.Rectangle(100, 100, 600, 400));
player.body.worldBounce = new Phaser.Math.Vector2(0.5, 0.5);

// Detect world bounds hit via event (requires opt-in)
player.body.onWorldBounds = true;
this.physics.world.on('worldbounds', (body, up, down, left, right) => {
    console.log('Hit edge:', { up, down, left, right });
});

// Size and shape
player.body.setSize(24, 32, true);     // width, height, re-center on GO
player.body.setOffset(4, 0);           // offset from GO position
player.body.setCircle(16);             // circular body, radius 16
player.body.setCircle(16, 4, 4);       // circular with offset

// Collision behavior
player.body.setImmovable(true);        // not moved by collisions
player.body.setPushable(false);        // reflects velocity to collider
player.body.slideFactor.set(0, 0);     // Sokoban-style: stops after push
player.body.setMass(2);               // affects momentum exchange

// Enable / disable
player.disableBody(true, true);        // disable body + hide Game Object
player.enableBody(true, x, y, true, true); // re-enable at position + show

// Per-direction collision check
player.body.checkCollision.up = false; // don't collide from above
player.body.syncBounds = true;         // auto-sync size to texture

// Get unique category values from the physics plugin
const CAT_PLAYER = this.physics.nextCategory();   // 0x0002
const CAT_ENEMY  = this.physics.nextCategory();   // 0x0004
const CAT_BULLET = this.physics.nextCategory();   // 0x0008

// Assign categories to bodies or groups
player.setCollisionCategory(CAT_PLAYER);
enemy.setCollisionCategory(CAT_ENEMY);
bullet.setCollisionCategory(CAT_BULLET);

// Set what each body collides with
player.setCollidesWith([CAT_ENEMY]);              // player hits enemies only
enemy.setCollidesWith([CAT_PLAYER, CAT_BULLET]);  // enemies hit player + bullets
bullet.setCollidesWith([CAT_ENEMY]);              // bullets hit enemies only

// Add/remove individual categories from existing mask
player.addCollidesWith(CAT_BULLET);
player.removeCollidesWith(CAT_ENEMY);

// Check if a body will collide with a category
player.willCollideWith(CAT_ENEMY); // returns boolean

// Reset to default (collides with everything)
player.resetCollisionCategory();

// Works on Groups too
enemies.setCollisionCategory(CAT_ENEMY);
enemies.setCollidesWith([CAT_PLAYER, CAT_BULLET]);