// camera.js

export class CameraController {
    constructor(diorama) {
        this.diorama = diorama;
        this.canvas = diorama.canvas;
        this.element = diorama.element;

        this.isDragging = false;
        this.hasDragged = false; // Tracks if the current interaction is a drag or a tap
        this.dragButton = 0;
        this.touchMode = '';
        this.lastMouse = { x: 0, y: 0 };
        this.lastPinchDist = 0;

        this.attachEvents();
    }

    orbit(dx, dy) {
        this.diorama.theta -= dx * 0.4;
        this.diorama.phi += dy * 0.4;
        this.diorama.phi = Math.max(-90, Math.min(90, this.diorama.phi));
    }

    pan(dx, dy) {
        const t = this.diorama.theta * Math.PI / 180;
        const p = this.diorama.phi * Math.PI / 180;

        const rightX = Math.cos(t);
        const rightZ = -Math.sin(t);

        const upX = -Math.sin(p) * Math.sin(t);
        const upY = Math.cos(p);
        const upZ = -Math.sin(p) * Math.cos(t);

        const rect = this.canvas.getBoundingClientRect();
        const panSpeed = this.diorama.radius / rect.height;

        this.diorama.target[0] += (-rightX * dx + upX * dy) * panSpeed;
        this.diorama.target[1] += (upY * dy) * panSpeed;
        this.diorama.target[2] += (-rightZ * dx + upZ * dy) * panSpeed;
    }

    zoomRatio(ratio) {
        this.diorama.radius *= ratio;
        this.diorama.radius = Math.max(1, Math.min(50, this.diorama.radius));
    }

    zoomLinear(delta) {
        this.diorama.radius += delta * 0.05;
        this.diorama.radius = Math.max(1, Math.min(50, this.diorama.radius));
    }

    attachEvents() {
        this.element.addEventListener('contextmenu', e => e.preventDefault());

        const notifyChange = () => {
            this.hasDragged = true; // Mark that a drag occurred
            this.diorama.requestRender();
        };

        this.canvas.addEventListener('mousedown', (e) => {
            // REMOVED e.preventDefault() here so the browser can register the native click!
            this.isDragging = true;
            this.hasDragged = false;
            this.lastMouse = { x: e.clientX, y: e.clientY };

            this.dragButton = e.button;
            if (this.dragButton === 0) {
                if (e.ctrlKey || e.metaKey) this.dragButton = 2;
                else if (e.shiftKey) this.dragButton = 1;
            }

            if (this.dragButton === 1) this.canvas.style.cursor = 'move';
            else if (this.dragButton === 2) this.canvas.style.cursor = 'ns-resize';
            else this.canvas.style.cursor = 'grabbing';
        });

        window.addEventListener('mouseup', () => {
            this.isDragging = false;
            this.canvas.style.cursor = 'grab';
        });

        window.addEventListener('mousemove', (e) => {
            if (!this.isDragging) return;
            const dx = e.clientX - this.lastMouse.x;
            const dy = e.clientY - this.lastMouse.y;
            
            // Only consider it a drag if we move more than a couple of pixels
            if (Math.hypot(dx, dy) > 3) {
                this.lastMouse = { x: e.clientX, y: e.clientY };
                if (this.dragButton === 0) this.orbit(dx, dy);
                else if (this.dragButton === 1) this.pan(dx, dy);
                else if (this.dragButton === 2) this.zoomLinear(dy);
                notifyChange();
            }
        });

        // Touch interactions (simplified for brevity, matching the mousedown/move logic)
        this.canvas.addEventListener('touchstart', (e) => {
            this.isDragging = true;
            this.hasDragged = false;
            if (e.touches.length === 1) {
                this.touchMode = 'orbit';
                this.lastMouse = { x: e.touches[0].clientX, y: e.touches[0].clientY };
            } else if (e.touches.length >= 2) {
                this.touchMode = 'pan-zoom';
                const t1 = e.touches[0], t2 = e.touches[1];
                this.lastMouse = { x: (t1.clientX + t2.clientX) / 2, y: (t1.clientY + t2.clientY) / 2 };
                this.lastPinchDist = Math.hypot(t1.clientX - t2.clientX, t1.clientY - t2.clientY);
            }
        }, { passive: true }); // Passive allows the synthetic 'click' to fire later

        this.canvas.addEventListener('touchmove', (e) => {
            if (!this.isDragging) return;
            // Prevent default here to stop page scrolling while orbiting
            if (e.cancelable) e.preventDefault(); 
            this.hasDragged = true;
            // ... (Insert previous touchmove logic for orbit/pan here) ...
            this.diorama.requestRender();
        }, { passive: false });

        const onTouchEnd = (e) => {
            if (e.touches.length === 0) {
                this.isDragging = false;
                this.touchMode = '';
            }
        };

        this.canvas.addEventListener('touchend', onTouchEnd);
        this.canvas.addEventListener('touchcancel', onTouchEnd);

        // --- The Magic Event Forwarder ---
        // Native click fires AFTER mouseup/touchend. 
        this.canvas.addEventListener('click', (e) => {
            if (this.hasDragged) {
                // If it was a drag, stop the click from bubbling to the scrubber
                e.stopPropagation();
                e.preventDefault();
            }
            // If it WASN'T a drag, we do nothing. The event naturally bubbles up!
        });
    }
}