/**
 * Präsident Maximilian Valor – die Spielfigur.
 *
 * Die Figur ist frei erfunden: Raumrüstung mit geschlossenem Helm (kein Gesicht,
 * keine Frisur) und Umhang in den Farben der fiktiven Vereinigten Erde.
 * @module entities/Player
 */

import { GAME, PLAYER, WEAPONS } from '../config.js';
import { fromAngle, scale } from '../logic/math.js';
import { isNearlyZero } from '../logic/steering.js';
import { WeaponState } from '../logic/weapon.js';
import { TEXTURE_KEYS } from '../systems/Placeholders.js';

export class Player extends Phaser.Physics.Arcade.Sprite {
  /**
   * @param {Phaser.Scene} scene
   * @param {number} x
   * @param {number} y
   */
  constructor(scene, x, y) {
    super(scene, x, y, TEXTURE_KEYS.player);
    scene.add.existing(this);
    scene.physics.add.existing(this);
    this.setDepth(GAME.depth.player);
    this.setCollideWorldBounds(true);
    const r = PLAYER.radius;
    this.body.setCircle(r, this.width / 2 - r, this.height / 2 - r);

    this.maxHp = PLAYER.maxHp;
    this.hp = PLAYER.maxHp;
    this.alive = true;
    this.weapons = PLAYER.weaponSlots.map((id) => new WeaponState(WEAPONS[id]));
    this.weaponIndex = 0;
    this.aimAngle = 0;
    this.dodgeUntil = 0;
    this.dodgeReadyAt = 0;
    this.dodgeDirection = { x: 1, y: 0 };
    this.hitInvulnerableUntil = 0;
  }

  /** @returns {WeaponState} */
  get weapon() {
    return this.weapons[this.weaponIndex];
  }

  /** @param {number} now @returns {boolean} */
  isDodging(now) {
    return now < this.dodgeUntil;
  }

  /**
   * Während der Rolle und kurz nach einem Treffer nimmt der Präsident keinen Schaden.
   * @param {number} now
   * @returns {boolean}
   */
  isInvulnerable(now) {
    return !this.alive || this.isDodging(now) || now < this.hitInvulnerableUntil;
  }

  /**
   * @param {number} now
   * @returns {number} Bereitschaft der Rolle, 0..1 (1 = bereit).
   */
  dodgeReadiness(now) {
    if (now >= this.dodgeReadyAt) return 1;
    return 1 - (this.dodgeReadyAt - now) / PLAYER.dodge.cooldownMs;
  }

  /**
   * Startet eine Ausweichrolle in Bewegungsrichtung (ohne Bewegung: in Blickrichtung).
   * @param {number} now
   * @param {{x: number, y: number}} moveDirection Normalisiert.
   * @returns {boolean} true, wenn die Rolle ausgelöst wurde.
   */
  tryDodge(now, moveDirection) {
    if (!this.alive || now < this.dodgeReadyAt) return false;
    this.dodgeDirection = isNearlyZero(moveDirection) ? fromAngle(this.aimAngle) : moveDirection;
    this.dodgeUntil = now + PLAYER.dodge.durationMs;
    this.dodgeReadyAt = now + PLAYER.dodge.cooldownMs;
    return true;
  }

  /**
   * Bewegung für diesen Frame.
   * @param {number} now
   * @param {{x: number, y: number}} moveDirection Normalisiert.
   * @param {boolean} blocked true, solange ein Orbital-Befehl eingegeben wird.
   */
  move(now, moveDirection, blocked) {
    if (!this.alive) {
      this.setVelocity(0, 0);
      return;
    }
    if (this.isDodging(now)) {
      const v = scale(this.dodgeDirection, PLAYER.dodge.speed);
      this.setVelocity(v.x, v.y);
      this.setAlpha(0.55);
      return;
    }
    this.setAlpha(1);
    const v = blocked ? { x: 0, y: 0 } : scale(moveDirection, PLAYER.speed);
    this.setVelocity(v.x, v.y);
  }

  /**
   * Richtet die Figur auf einen Punkt in Weltkoordinaten aus.
   * @param {number} x
   * @param {number} y
   */
  aimAt(x, y) {
    this.aimAngle = Math.atan2(y - this.y, x - this.x);
    this.setRotation(this.aimAngle);
  }

  /** @returns {{x: number, y: number}} Position der Waffenmündung. */
  muzzlePosition() {
    const reach = PLAYER.radius + 8;
    return {
      x: this.x + Math.cos(this.aimAngle) * reach,
      y: this.y + Math.sin(this.aimAngle) * reach,
    };
  }

  /**
   * @param {number} index
   * @returns {boolean} true, wenn gewechselt wurde.
   */
  switchWeapon(index) {
    if (index === this.weaponIndex || !this.weapons[index]) return false;
    // Nachladen bricht beim Wechsel ab – sonst könnte man durch Wechseln „heimlich“ laden.
    this.weapon.cancelReload();
    this.weaponIndex = index;
    return true;
  }

  /**
   * @param {1|-1} step
   * @returns {boolean}
   */
  cycleWeapon(step) {
    const count = this.weapons.length;
    return this.switchWeapon((this.weaponIndex + step + count) % count);
  }

  /**
   * Fügt Schaden zu, sofern der Präsident nicht gerade unverwundbar ist.
   * @param {number} amount
   * @param {number} now
   * @returns {number} Tatsächlich erlittener Schaden.
   */
  takeDamage(amount, now) {
    if (this.isInvulnerable(now) || amount <= 0) return 0;
    const dealt = Math.min(this.hp, amount);
    this.hp -= dealt;
    this.hitInvulnerableUntil = now + PLAYER.hitInvulnerabilityMs;
    if (this.hp <= 0) {
      this.alive = false;
      this.setVelocity(0, 0);
    }
    return dealt;
  }

  /** @param {number} amount @returns {number} Tatsächlich geheilte Punkte. */
  heal(amount) {
    const before = this.hp;
    this.hp = Math.min(this.maxHp, this.hp + amount);
    return this.hp - before;
  }

  /** Füllt die Reserve aller Waffen auf (Nachschubkapsel). */
  refillAmmo() {
    for (const weapon of this.weapons) weapon.refill();
  }

  /** @param {number} now @returns {boolean} true, wenn die aktive Waffe fertig nachgeladen hat. */
  updateWeapons(now) {
    return this.weapon.update(now);
  }
}