"use strict";

(function (global) {
  function bindTouchInput(ctx) {
    if (!ctx?.canvas) return false;
    const { canvas, world, uiCache } = ctx;
    const actions = global.TarinaiPointerActionSystem.create(ctx);
    ctx.bindMobileModeControls();
    const isMobileAutoScrollMode = () => {
      const mode = ctx.mobileInputMode?.() || "auto";
      const touchMobile = document.body.classList.contains("touch-mobile-ui") || window.matchMedia?.("(max-width: 980px)")?.matches;
      return touchMobile && mode === "auto" && (!world.tool || world.tool === "observe");
    };

    canvas.addEventListener("touchstart", (e) => {
      if (!e.touches?.length) return;
      uiCache.touchMoved = false;
      const mode = ctx.mobileInputMode();
      const autoPageScroll = isMobileAutoScrollMode();
      if (!autoPageScroll) e.preventDefault();
      if (mode === "camera" && e.touches.length === 1) {
        const t = e.touches[0];
        uiCache.touchStartX = t.clientX;
        uiCache.touchStartY = t.clientY;
        uiCache.touchLastX = t.clientX;
        uiCache.touchLastY = t.clientY;
        uiCache.touchMode = "cameraPan";
        return;
      }
      if (e.touches.length >= 2) {
        const c = ctx.touchCenter(e.touches);
        uiCache.touchMode = "pinchZoom";
        uiCache.pinchStartDistance = Math.max(1, ctx.touchDistance(e.touches));
        uiCache.pinchStartZoom = world.fieldZoom || 1;
        uiCache.pinchLastCenterX = c?.clientX || 0;
        uiCache.pinchLastCenterY = c?.clientY || 0;
        return;
      }
      const t = e.touches[0];
      const p = ctx.screenToWorldClient(t.clientX, t.clientY);
      uiCache.touchStartX = t.clientX;
      uiCache.touchStartY = t.clientY;
      uiCache.touchLastX = t.clientX;
      uiCache.touchLastY = t.clientY;
      if (mode === "tool" && world.tool === "observe") {
        uiCache.touchMode = "toolTapOnly";
        return;
      }
      const touchModeByTool = { shoot: "shoot", area_delete: "areaDelete", water_hose: "hose", pinch: "grab" };
      const touchMode = touchModeByTool[world.tool];
      if (touchMode && actions?.beginToolAt?.(p, t.clientX, t.clientY, { touch: true, touchMode })) return;
      uiCache.touchMode = autoPageScroll ? "autoTapOrScroll" : (mode === "tool" ? "toolTapOnly" : "panOrTap");
    }, { passive: false });

    canvas.addEventListener("touchmove", (e) => {
      if (!e.touches?.length || !uiCache.touchMode) return;
      if (uiCache.touchMode !== "autoTapOrScroll") e.preventDefault();
      if (uiCache.touchMode === "pinchZoom" && e.touches.length >= 2) {
        const c = ctx.touchCenter(e.touches);
        const distNow = Math.max(1, ctx.touchDistance(e.touches));
        const ratio = distNow / Math.max(1, uiCache.pinchStartDistance || distNow);
        ctx.setZoomAroundClientPoint(c.clientX, c.clientY, (uiCache.pinchStartZoom || 1) * ratio);
        const dx = c.clientX - (uiCache.pinchLastCenterX || c.clientX);
        const dy = c.clientY - (uiCache.pinchLastCenterY || c.clientY);
        uiCache.pinchLastCenterX = c.clientX;
        uiCache.pinchLastCenterY = c.clientY;
        if (Math.hypot(dx, dy) > 0.1) world.panCamera?.(-dx, -dy);
        uiCache.touchMoved = true;
        render();
        return;
      }
      const t = e.touches[0];
      const p = ctx.screenToWorldClient(t.clientX, t.clientY);
      const screenDx = t.clientX - (uiCache.touchLastX || t.clientX);
      const screenDy = t.clientY - (uiCache.touchLastY || t.clientY);
      const totalMove = Math.hypot(t.clientX - (uiCache.touchStartX || t.clientX), t.clientY - (uiCache.touchStartY || t.clientY));
      uiCache.touchLastX = t.clientX;
      uiCache.touchLastY = t.clientY;
      if (uiCache.touchMode === "cameraPan") {
        if (totalMove > 2) uiCache.touchMoved = true;
        world.panCamera?.(-screenDx, -screenDy);
        render();
        return;
      }
      if (uiCache.touchMode === "toolTapOnly") {
        if (totalMove > 8) uiCache.touchMoved = true;
        return;
      }
      if (actions?.moveActive?.(p, t.clientX, t.clientY, { touch: true, renderFrame: uiCache.touchMode === "grab" })) return;
      if (uiCache.touchMode === "autoTapOrScroll") {
        if (totalMove > 7) uiCache.touchMoved = true;
        return;
      }
      if (uiCache.touchMode === "panOrTap") {
        if (totalMove > 7) {
          uiCache.touchMoved = true;
          world.panCamera?.(-screenDx, -screenDy);
          render();
        }
      }
    }, { passive: false });

    canvas.addEventListener("touchend", (e) => {
      if (uiCache.touchMode !== "autoTapOrScroll") e.preventDefault();
      if (actions?.endActive?.(e.changedTouches?.[0]?.clientX || uiCache.touchLastX || 0, e.changedTouches?.[0]?.clientY || uiCache.touchLastY || 0)) {
        // Active tool ended; click suppression is handled through movement flags.
      } else if (uiCache.touchMode === "toolTapOnly" && !uiCache.touchMoved) {
        actions?.dispatchTapClient?.(uiCache.touchLastX || uiCache.touchStartX, uiCache.touchLastY || uiCache.touchStartY);
      } else if (uiCache.touchMode === "autoTapOrScroll" && !uiCache.touchMoved) {
        e.preventDefault();
        actions?.dispatchTapClient?.(uiCache.touchLastX || uiCache.touchStartX, uiCache.touchLastY || uiCache.touchStartY);
      } else if (uiCache.touchMode === "panOrTap" && !uiCache.touchMoved) {
        actions?.dispatchTapClient?.(uiCache.touchLastX || uiCache.touchStartX, uiCache.touchLastY || uiCache.touchStartY);
      }
      if (!e.touches?.length) {
        uiCache.touchMode = "";
        uiCache.touchMoved = false;
      }
    }, { passive: false });

    canvas.addEventListener("touchcancel", () => actions?.cancel?.(), { passive: true });
    return true;
  }

  global.TarinaiTouchInput = Object.freeze({ bindTouchInput });
})(window);