"use strict";

// Layer: entity-runtime/items/pin-attachment
// Centralizes pushpin/oshibyo attachment geometry, target classification, and
// render attachment placement.  Motion/effects still live in dynamic systems.
(function (global) {
  function isPin(itemOrType) {
    const type = typeof itemOrType === "string" ? itemOrType : itemOrType?.type;
    return Boolean(type && typeof global.isPinType === "function" && global.isPinType(type));
  }
  function behaviorFor(itemOrType) {
    const type = typeof itemOrType === "string" ? itemOrType : itemOrType?.type;
    return typeof global.pinBehaviorFor === "function" ? global.pinBehaviorFor(type) : null;
  }
  function isOshibyo(itemOrType) {
    return Boolean(behaviorFor(itemOrType)?.blocksZunchi);
  }
  function tarinaiVisualSide(item, tarinai) {
    const faceDir = tarinai?.facingDir ? tarinai.facingDir() : (tarinai?.facing || 1);
    const faceSide = faceDir >= 0 ? 1 : -1;
    return isOshibyo(item) ? -faceSide : faceSide;
  }
  function tarinaiAnchor(item, tarinai, opts = {}) {
    const r = tarinai?.radius || 16;
    const visualSide = Number.isFinite(opts.visualSide) ? opts.visualSide : tarinaiVisualSide(item, tarinai);
    if (isOshibyo(item)) {
      const sprite = String(tarinai?.visibleSpriteId || (tarinai?.rawSpriteId ? tarinai.rawSpriteId() : "") || "");
      const backSprite = sprite === "back" || sprite === "tarinai12_back" || /(^|_)back$/i.test(sprite);
      const xFactor = backSprite ? 0.62 : 0.96;
      const yFactor = backSprite ? 0.28 : 0.50;
      const angleFactor = backSprite ? 0.32 : 0.48;
      const distFactor = backSprite ? 0.70 : 0.96;
      return {
        visualSide,
        x: (tarinai?.x || 0) + visualSide * r * xFactor,
        y: (tarinai?.y || 0) + r * yFactor,
        angle: visualSide * angleFactor,
        distance: r * distFactor,
        offsetY: r * yFactor,
      };
    }
    const dx = Number.isFinite(opts.dx) ? opts.dx : 0;
    const dy = Number.isFinite(opts.dy) ? opts.dy : -1;
    const dist = Number.isFinite(opts.distance) ? opts.distance : Math.hypot(dx, dy);
    const clampFn = global.clamp || ((v, lo, hi) => Math.max(lo, Math.min(hi, v)));
    return {
      visualSide,
      x: (tarinai?.x || 0) + visualSide * r * 0.36,
      y: (tarinai?.y || 0) - r * 0.04,
      angle: Math.atan2(dy || -1, dx || visualSide),
      poseAngle: visualSide * 0.28,
      distance: clampFn(dist || r * 0.58, r * 0.20, r * 0.74),
      offsetY: clampFn(dy, -r * 0.74, r * 0.38),
    };
  }
  function applyTarinaiPose(item, tarinai, worldRef = null) {
    if (!item || !tarinai) return null;
    const anchor = tarinaiAnchor(item, tarinai);
    item.pinVisualSide = anchor.visualSide;
    item.x = anchor.x;
    item.y = anchor.y;
    item.prevX = item.x;
    item.prevY = item.y;
    item.spin = isOshibyo(item) ? anchor.angle : (anchor.poseAngle ?? anchor.angle);
    item.vx = tarinai.vx || 0;
    item.vy = tarinai.vy || 0;
    item.deletable = false;
    if (worldRef) worldRef.drawListDirty = true;
    return anchor;
  }
  function ballAnchor(item, ball) {
    const angle = (ball?.spin || 0) + (item?.pinBallOffsetAngle || 0);
    const distance = Math.max(4, Number(item?.pinBallOffsetDistance || (ball?.r || 18) * 0.55) || (ball?.r || 18) * 0.55);
    return {
      angle,
      distance,
      visualSide: Math.cos(angle) >= 0 ? 1 : -1,
      x: (ball?.x || 0) + Math.cos(angle) * distance,
      y: (ball?.y || 0) + Math.sin(angle) * distance,
      spin: angle + (isOshibyo(item) ? 0.18 : Math.PI * 0.5),
    };
  }
  function applyBallPose(item, ball, worldRef = null) {
    if (!item || !ball) return null;
    const anchor = ballAnchor(item, ball);
    item.prevX = item.x;
    item.prevY = item.y;
    item.x = anchor.x;
    item.y = anchor.y;
    item.vx = ball.vx || 0;
    item.vy = ball.vy || 0;
    item.pinVisualSide = anchor.visualSide;
    item.spin = anchor.spin;
    item.deletable = false;
    if (Number.isFinite(ball.spinVelocity)) item.spinVelocity = ball.spinVelocity;
    if (worldRef) worldRef.drawListDirty = true;
    return anchor;
  }
  function resetLooseState(item) {
    if (!item) return item;
    item.pinState = "loose";
    item.pinTargetId = "";
    item.pinAttachAngle = 0;
    item.pinAttachDistance = 0;
    item.pinOffsetY = 0;
    item.pinDamageTick = 0;
    item.pinFallCheckTimer = 0;
    item.pinLogAt = -999;
    return item;
  }

  function isAttachedToEntity(pin, entity) {
    if (!pin || !entity || !isPin(pin)) return false;
    if (entity.type === "ball") return pin.pinState === "ball_lodged" && pin.pinBallId === entity.id;
    const isTarinaiEntity = typeof global.Tarinai !== "undefined" && entity instanceof global.Tarinai;
    return isTarinaiEntity && pin.pinState === "lodged" && pin.pinTargetId === entity.id;
  }
  function drawAttachedForEntity(args = {}) {
    const { renderStack, entity, visibleRect, worldRef, time, drawnIds, isVisible } = args;
    if (!renderStack || !entity || !drawnIds || typeof isVisible !== "function") return 0;
    const source = entity.type === "ball" ? (renderStack.ballLodgedPins || []) : (renderStack.lodgedPins || []);
    let drawn = 0;
    for (const it of source) {
      if (!it || drawnIds.has(it.id) || !isAttachedToEntity(it, entity)) continue;
      if (isVisible(it, visibleRect)) it.draw?.(global.ctx || args.ctx, time ?? worldRef?.time ?? 0, args.lighting || null);
      drawnIds.add(it.id);
      drawn += 1;
    }
    return drawn;
  }
  global.TarinaiPinAttachmentSystem = Object.freeze({
    isPin,
    tarinaiAnchor,
    applyTarinaiPose,
    applyBallPose,
    resetLooseState,
    drawAttachedForEntity,
  });
})(typeof window !== "undefined" ? window : globalThis);