import Phaser from "phaser";
import type { Item } from "../core/types";
import { ALL_VARIANTS, type ItemVariantId } from "../core/config/ItemVariants";

/**
 * Factory for creating item sprites with optional variant glow effects.
 * Centralizes item rendering logic to ensure consistent glow styling across
 * inventory, quick slots, and world drops.
 */
export class ItemSpriteFactory {
  
  /**
   * Creates an item sprite with optional glow effect for variants.
   * Returns a container with the glow (if applicable) and main sprite.
   */
  static createItemSprite(
    scene: Phaser.Scene,
    item: Item,
    x: number,
    y: number,
    scale: number = 1
  ): Phaser.GameObjects.Container {
    const container = scene.add.container(x, y);
    
    // Create glow effect if item has a variant
    if (item.variant) {
      const glowColor = this.getGlowColor(item.variant as ItemVariantId);
      if (glowColor !== null) {
        const glow = this.createGlow(scene, item, scale, glowColor);
        container.add(glow);
      }
    }
    
    // Create main item sprite
    const sprite = scene.add.sprite(0, 0, item.textureKey, item.spriteIndex);
    sprite.setScale(scale);
    container.add(sprite);
    
    // Add upgrade level badge if item has been upgraded
    if (item.upgradeLevel && item.upgradeLevel > 0) {
      const badge = this.createUpgradeBadge(scene, item.upgradeLevel, scale);
      container.add(badge);
    }
    
    return container;
  }
  
  /**
   * Creates just a sprite (no container) for simpler use cases like drag icons.
   * Does not include glow - use createItemSprite for full effect.
   */
  static createSimpleSprite(
    scene: Phaser.Scene,
    item: Item,
    x: number,
    y: number,
    scale: number = 1
  ): Phaser.GameObjects.Sprite {
    const sprite = scene.add.sprite(x, y, item.textureKey, item.spriteIndex);
    sprite.setScale(scale);
    return sprite;
  }
  
  /**
   * Creates a soft glow effect behind the item using graphics.
   * Uses a radial gradient-like effect with multiple circles.
   */
  private static createGlow(
    scene: Phaser.Scene,
    _item: Item,
    scale: number,
    color: number
  ): Phaser.GameObjects.Graphics {
    const glow = scene.add.graphics();
    
    // Base size for the glow (16x16 sprite scaled)
    const baseSize = 16 * scale;
    const glowRadius = baseSize * 0.8;
    
    // Extract RGB from hex color
    const r = (color >> 16) & 0xff;
    const g = (color >> 8) & 0xff;
    const b = color & 0xff;
    
    // Draw multiple circles with decreasing alpha for soft glow effect
    const layers = 5;
    for (let i = layers; i >= 1; i--) {
      const layerRadius = glowRadius * (i / layers) * 1.2;
      const layerAlpha = 0.15 * (1 - (i - 1) / layers);
      
      glow.fillStyle(Phaser.Display.Color.GetColor(r, g, b), layerAlpha);
      glow.fillCircle(0, 0, layerRadius);
    }
    
    // Add pulsing animation to the glow
    scene.tweens.add({
      targets: glow,
      alpha: { from: 0.7, to: 1.0 },
      scaleX: { from: 0.9, to: 1.1 },
      scaleY: { from: 0.9, to: 1.1 },
      duration: 800,
      yoyo: true,
      repeat: -1,
      ease: 'Sine.easeInOut'
    });
    
    return glow;
  }
  
  /**
   * Gets the glow color for a variant.
   */
  private static getGlowColor(variantId: ItemVariantId): number | null {
    const variant = ALL_VARIANTS[variantId];
    return variant?.glowColor ?? null;
  }
  
  /**
   * Creates a badge displaying the upgrade level (e.g., "+1").
   */
  private static createUpgradeBadge(
    scene: Phaser.Scene,
    level: number,
    scale: number
  ): Phaser.GameObjects.Text {
    // Position at top-right corner, slightly inset
    const offset = 5 * scale;
    
    // Level text with strong outline for readability without background
    const text = scene.add.text(offset, -offset, `+${level}`, {
      fontSize: `${9 * scale}px`,
      color: "#ffd700",
      fontStyle: "bold",
      fontFamily: "monospace",
      stroke: "#000000",
      strokeThickness: 3
    });
    text.setOrigin(0.5);
    
    return text;
  }

  /**
   * Checks if an item has a variant with a glow.
   */
  static hasGlow(item: Item): boolean {
    return !!item.variant && !!ALL_VARIANTS[item.variant as ItemVariantId];
  }
}