/**
 * DOOM 3D - Mobile Touch Controls
 * Virtual thumbstick for movement, swipe aiming, and action buttons.
 */

class DoomMobileControls {
    constructor(player) {
        this.player = player;
        this.container = document.getElementById('mobile-controls');
        this.joystickBase = document.getElementById('joystick-base');
        this.joystickKnob = document.getElementById('joystick-knob');
        this.lookZone = document.getElementById('mobile-look-zone');

        this.touchMoveId = null;
        this.touchLookId = null;

        this.joystickCenter = { x: 0, y: 0 };
        this.maxRadius = 50;

        this.lastLookX = 0;
        this.lastLookY = 0;

        this.init();
    }

    init() {
        const isTouch = ('ontouchstart' in window) || (navigator.maxTouchPoints > 0);
        if (isTouch && this.container) {
            this.container.classList.remove('hidden');
        }

        this.setupJoystick();
        this.setupLookZone();
        this.setupActionButtons();
    }

    setupJoystick() {
        if (!this.joystickBase || !this.joystickKnob) return;

        const onTouchStart = (e) => {
            for (let i = 0; i < e.changedTouches.length; i++) {
                const touch = e.changedTouches[i];
                if (this.touchMoveId === null) {
                    this.touchMoveId = touch.identifier;
                    const rect = this.joystickBase.getBoundingClientRect();
                    this.joystickCenter.x = rect.left + rect.width / 2;
                    this.joystickCenter.y = rect.top + rect.height / 2;
                    this.handleJoystickMove(touch.clientX, touch.clientY);
                }
            }
        };

        const onTouchMove = (e) => {
            for (let i = 0; i < e.changedTouches.length; i++) {
                const touch = e.changedTouches[i];
                if (touch.identifier === this.touchMoveId) {
                    this.handleJoystickMove(touch.clientX, touch.clientY);
                }
            }
        };

        const onTouchEnd = (e) => {
            for (let i = 0; i < e.changedTouches.length; i++) {
                const touch = e.changedTouches[i];
                if (touch.identifier === this.touchMoveId) {
                    this.touchMoveId = null;
                    this.joystickKnob.style.transform = 'translate(-50%, -50%)';
                    this.player.keys.forward = false;
                    this.player.keys.backward = false;
                    this.player.keys.left = false;
                    this.player.keys.right = false;
                }
            }
        };

        this.joystickBase.addEventListener('touchstart', onTouchStart, { passive: false });
        window.addEventListener('touchmove', onTouchMove, { passive: false });
        window.addEventListener('touchend', onTouchEnd, { passive: false });
        window.addEventListener('touchcancel', onTouchEnd, { passive: false });
    }

    handleJoystickMove(clientX, clientY) {
        const dx = clientX - this.joystickCenter.x;
        const dy = clientY - this.joystickCenter.y;
        const dist = Math.hypot(dx, dy);

        const clampedDist = Math.min(dist, this.maxRadius);
        const angle = Math.atan2(dy, dx);

        const knobX = Math.cos(angle) * clampedDist;
        const knobY = Math.sin(angle) * clampedDist;

        this.joystickKnob.style.transform = `translate(calc(-50% + ${knobX}px), calc(-50% + ${knobY}px))`;

        // Normalize inputs (-1 to 1)
        const normX = knobX / this.maxRadius;
        const normY = knobY / this.maxRadius;

        const threshold = 0.25;
        this.player.keys.forward = normY < -threshold;
        this.player.keys.backward = normY > threshold;
        this.player.keys.left = normX < -threshold;
        this.player.keys.right = normX > threshold;
    }

    setupLookZone() {
        if (!this.lookZone) return;

        this.lookZone.addEventListener('touchstart', (e) => {
            for (let i = 0; i < e.changedTouches.length; i++) {
                const touch = e.changedTouches[i];
                if (this.touchLookId === null) {
                    this.touchLookId = touch.identifier;
                    this.lastLookX = touch.clientX;
                    this.lastLookY = touch.clientY;
                }
            }
        }, { passive: false });

        window.addEventListener('touchmove', (e) => {
            for (let i = 0; i < e.changedTouches.length; i++) {
                const touch = e.changedTouches[i];
                if (touch.identifier === this.touchLookId) {
                    const dx = touch.clientX - this.lastLookX;
                    const dy = touch.clientY - this.lastLookY;

                    this.lastLookX = touch.clientX;
                    this.lastLookY = touch.clientY;

                    // Apply rotation to player camera
                    const sensitivity = this.player.mouseSensitivity * 1.5;
                    this.player.euler.y -= dx * sensitivity;
                    this.player.euler.x -= dy * sensitivity;

                    const maxPitch = Math.PI / 2 - 0.02;
                    this.player.euler.x = Math.max(-maxPitch, Math.min(maxPitch, this.player.euler.x));
                    this.player.camera.quaternion.setFromEuler(this.player.euler);
                }
            }
        }, { passive: false });

        const endLook = (e) => {
            for (let i = 0; i < e.changedTouches.length; i++) {
                const touch = e.changedTouches[i];
                if (touch.identifier === this.touchLookId) {
                    this.touchLookId = null;
                }
            }
        };

        window.addEventListener('touchend', endLook, { passive: false });
        window.addEventListener('touchcancel', endLook, { passive: false });
    }

    setupActionButtons() {
        const btnFire = document.getElementById('btn-mobile-fire');
        const btnJump = document.getElementById('btn-mobile-jump');
        const btnUse = document.getElementById('btn-mobile-use');
        const btnNext = document.getElementById('btn-mobile-next');
        const btnPrev = document.getElementById('btn-mobile-prev');

        if (btnFire) {
            btnFire.addEventListener('touchstart', (e) => {
                e.preventDefault();
                this.player.keys.shoot = true;
                if (window.game && window.game.weapons) {
                    window.game.weapons.triggerAttack();
                }
            });
            btnFire.addEventListener('touchend', (e) => {
                e.preventDefault();
                this.player.keys.shoot = false;
            });
        }

        if (btnJump) {
            btnJump.addEventListener('touchstart', (e) => {
                e.preventDefault();
                this.player.keys.jump = true;
            });
            btnJump.addEventListener('touchend', (e) => {
                e.preventDefault();
                this.player.keys.jump = false;
            });
        }

        if (btnUse) {
            btnUse.addEventListener('touchstart', (e) => {
                e.preventDefault();
                this.player.checkInteractions();
            });
        }

        if (btnNext) {
            btnNext.addEventListener('touchstart', (e) => {
                e.preventDefault();
                if (window.game && window.game.weapons) {
                    window.game.weapons.nextWeapon();
                }
            });
        }

        if (btnPrev) {
            btnPrev.addEventListener('touchstart', (e) => {
                e.preventDefault();
                if (window.game && window.game.weapons) {
                    window.game.weapons.prevWeapon();
                }
            });
        }
    }
}

window.DoomMobileControls = DoomMobileControls;