// designate component
"atomic component";
//import gl-matrix library
//https://github.com/toji/gl-matrix for more information
import {vec3, quat} from "gl-matrix";

//define constans
const MOVE_FORCE = 1.8;
const INAIR_MOVE_FORCE = 0.02;
const BRAKE_FORCE = 0.2;
const JUMP_FORCE = 7.0;
const YAW_SENSITIVITY = 0.1;
const INAIR_THRESHOLD_TIME = 0.1;

//define a component AvatarController
class AvatarController extends Atomic.JSComponent {
    //define an inspectorFields to make variables visible in editor
    inspectorFields = {
        //needs default value to make editor understand type of that value
        speed: 1.0
    };

    speed = 1.0;
    cameraNode: Atomic.Node;
    onGround = true;
    okToJump = true;
    inAirTime = 0.0;
    softGrounded = true;


    cameraMode = 0;

    yaw = 0;
    pitch = 0;

    moveForward = false;
    moveBackwards = false;
    moveLeft = false;
    moveRight = false;
    mouseMoveX = 0.0;
    mouseMoveY = 0.0;
    button0 = false;
    button1 = false;

    lastButton0 = false;
    lastButton1 = false;

    idle = true;

    start() {
        //get main camera and set its node to cameraNode
        const camera = this.node.scene.getMainCamera();
        this.cameraNode = camera.node;

        // Create rigidbody, and set non-zero mass so that the body becomes dynamic
        const body = <Atomic.RigidBody>this.node.createComponent("RigidBody");
        body.mass = 1.0;

        // Set zero angular factor so that physics doesn't turn the character on its own.
        // Instead we will control the character yaw manually
        body.angularFactor = [0, 0, 0];

        // Set the rigidbody to signal collision also when in rest, so that we get ground collisions properly
        body.collisionEventMode = Atomic.COLLISION_ALWAYS;

        // Set a capsule shape for collision
        const shape = <Atomic.CollisionShape>this.node.createComponent("CollisionShape");
        shape.setCapsule(2, 4, [0, 2, 0]);
    }

    fixedUpdate(timeStep: number) {

        //get a RigidBody component from the current node
        const body = <Atomic.RigidBody>this.node.getComponent("RigidBody");

        // Update the in air timer. Reset if grounded
        if (!this.onGround) {
            this.inAirTime += timeStep;
        }
        else {
            this.inAirTime = 0.0;
        }

        // When character has been in air less than 1/10 second, it's still interpreted as being on ground
        const softGrounded = this.inAirTime < INAIR_THRESHOLD_TIME;

        // Get rotation of the current node
        const rot = this.node.getRotation();

        let moveDir = [0, 0, 0];

        // Update movement & animation
        const velocity = body.getLinearVelocity();

        // Velocity on the XZ plane
        const planeVelocity = [velocity[0], 0.0, velocity[2]];

        if (this.cameraMode != 2) {
            if (this.moveForward) {
                vec3.add(moveDir, moveDir, [0, 0, 1]);
            }
            if (this.moveBackwards) {
                vec3.add(moveDir, moveDir, [0, 0, -1]);
            }
            if (this.moveLeft) {
                vec3.add(moveDir, moveDir, [-1, 0, 0]);
            }
            if (this.moveRight) {
                vec3.add(moveDir, moveDir, [1, 0, 0]);
            }
        }

        if (vec3.length(moveDir) > 0.0) {
            vec3.normalize(moveDir, moveDir);
        }

        vec3.transformQuat(moveDir, moveDir, [rot[1], rot[2], rot[3], rot[0]]);
        vec3.scale(moveDir, moveDir, (softGrounded ? MOVE_FORCE : INAIR_MOVE_FORCE));

        if (this.softGrounded) {
            vec3.scale(moveDir, moveDir, this.speed);
        }

        body.applyImpulse(moveDir);

        if (this.softGrounded) {

            // When on ground, apply a braking force to limit maximum ground velocity
            vec3.negate(planeVelocity, planeVelocity);
            vec3.scale(planeVelocity, planeVelocity, BRAKE_FORCE);
            body.applyImpulse(planeVelocity);

            // Jump. Must release jump control inbetween jumps
            if (this.button1) {
                if (this.okToJump) {
                    let jumpforce = [0, 1, 0];
                    vec3.scale(jumpforce, jumpforce, JUMP_FORCE);
                    //Apply impulse to the body
                    body.applyImpulse(jumpforce);
                    this.okToJump = false;
                }
            } else {
                this.okToJump = true;
            }
        }


        if (this.softGrounded && vec3.length(moveDir) > 0.0) {
            this.idle = false;
        } else {
            this.idle = true;
        }

        // Reset grounded flag for next frame
        this.onGround = true;
    }

    MoveCamera(timeStep) {

        // Movement speed as world units per second
        const MOVE_SPEED = 10.0;
        // Mouse sensitivity as degrees per pixel
        const MOUSE_SENSITIVITY = 0.1;

        this.yaw = this.yaw + MOUSE_SENSITIVITY * this.mouseMoveX;
        this.pitch = this.pitch + MOUSE_SENSITIVITY * this.mouseMoveY;

        if (this.pitch < -90) {
            this.pitch = -90;
        }

        if (this.pitch > 90) {
            this.pitch = 90;
        }

        // Construct new orientation for the camera scene node from yaw and pitch. Roll is fixed to zero
        this.cameraNode.rotation = QuatFromEuler(this.pitch, this.yaw, 0.0);

        let speed = MOVE_SPEED * timeStep;

        //translate camera on the amount of speed value
        if (this.moveForward) {
            this.cameraNode.translate([0.0, 0.0, this.speed]);
        }
        if (this.moveBackwards) {
            this.cameraNode.translate([0.0, 0.0, -this.speed]);
        }
        if (this.moveLeft) {
            this.cameraNode.translate([-speed, 0.0, 0.0]);
        }
        if (this.moveRight) {
            this.cameraNode.translate([speed, 0.0, 0.0]);
        }

    }

    UpdateControls() {

        let input = Atomic.input;

        this.moveForward = false;
        this.moveBackwards = false;
        this.moveLeft = false;
        this.moveRight = false;
        this.mouseMoveX = 0.0;
        this.mouseMoveY = 0.0;
        this.button0 = false;
        this.button1 = false;

        // Movement speed as world units per second
        // let MOVE_SPEED = 20.0; -- unused

        // Mouse sensitivity as degrees per pixel
        // let MOUSE_SENSITIVITY = 0.1; -- unused

        //check input
        if (input.getKeyDown(Atomic.KEY_W) || input.getKeyDown(Atomic.KEY_UP)) {
            this.moveForward = true;
        }
        if (input.getKeyDown(Atomic.KEY_S) || input.getKeyDown(Atomic.KEY_DOWN)) {
            this.moveBackwards = true;
        }
        if (input.getKeyDown(Atomic.KEY_A) || input.getKeyDown(Atomic.KEY_LEFT)) {
            this.moveLeft = true;
        }
        if (input.getKeyDown(Atomic.KEY_D) || input.getKeyDown(Atomic.KEY_RIGHT)) {
            this.moveRight = true;
        }

        if (input.getKeyPress(Atomic.KEY_F)) {
            this.button0 = true;
        }
        if (input.getKeyPress(Atomic.KEY_SPACE)) {
            this.button1 = true;
        }

        //if we are on mobile
        if (Atomic.platform == "Android" || Atomic.platform == "iOS") {
            //iterate through each TouchState, if it doesn't touch any widgets, use it as a `mouse`
            for (let i = 0; i < Atomic.input.getNumTouches(); i++) {
                let touchState = Atomic.input.getTouch(i);
                if (touchState.touchedWidget == null) {
                    let delta = touchState.delta;
                    this.mouseMoveX = delta[0];
                    this.mouseMoveY = delta[1];
                }
            }
            //if its a desktop
        } else {
            // update mouse coordinates
            this.mouseMoveX = input.getMouseMoveX();
            this.mouseMoveY = input.getMouseMoveY();
        }

    }

    update(timeStep) {

        this.UpdateControls();

        //if it's a free view
        if (this.cameraMode != 2) {
            this.yaw += this.mouseMoveX * YAW_SENSITIVITY;
            this.pitch += this.mouseMoveY * YAW_SENSITIVITY;
        }

        if (this.pitch < -80) {
            this.pitch = -80;
        }
        if (this.pitch > 80) {
            this.pitch = 80;
        }

        if (this.button0) {
            this.cameraMode++;
            if (this.cameraMode == 3) {
                this.cameraMode = 0;
            }
        }
    }

    //that function called right after update function
    postUpdate(timestep: number) {

        // Get camera lookat dir from character yaw + pitch
        let rot = this.node.getRotation();

        //create quaternion
        let dir = quat.create();
        //set X value
        quat.setAxisAngle(dir, [1, 0, 0], (this.pitch * Math.PI / 180.0));

        quat.multiply(dir, [rot[1], rot[2], rot[3], rot[0]], dir);

        let headNode = this.node.getChild("Head_Tip", true);

        //if it's a FPS view
        if (this.cameraMode == 1) {

            let headPos = <number[]>headNode.getWorldPosition();
            let offset = [0.0, 0.15, 0.2];
            vec3.add(headPos, headPos, vec3.transformQuat(offset, offset, [rot[1], rot[2], rot[3], rot[0]]));
            this.cameraNode.setPosition(headPos);
            this.cameraNode.setRotation([dir[3], dir[0], dir[1], dir[2]]);
            quat.setAxisAngle(dir, [0, 1, 0], (this.yaw * Math.PI / 180.0));
            this.node.setRotation([dir[3], dir[0], dir[1], dir[2]]);

        }
        //if it's a third person view
        if (this.cameraMode == 0) {

            let aimPoint = <number[]>this.node.getWorldPosition();
            let aimOffset = [0, 1.7, 0];
            vec3.transformQuat(aimOffset, aimOffset, dir);
            vec3.add(aimPoint, aimPoint, aimOffset);

            let rayDir = vec3.create();
            vec3.transformQuat(rayDir, [0, 0, -1], dir);
            vec3.scale(rayDir, rayDir, 8);

            vec3.add(aimPoint, aimPoint, rayDir);

            this.cameraNode.setPosition(aimPoint);
            this.cameraNode.setRotation([dir[3], dir[0], dir[1], dir[2]]);
            quat.setAxisAngle(dir, [0, 1, 0], (this.yaw * Math.PI / 180.0));
            this.node.setRotation([dir[3], dir[0], dir[1], dir[2]]);

        }
        else {
            this.MoveCamera(timestep);
        }
    }
}

function QuatFromEuler(x, y, z) {
    const M_PI = 3.14159265358979323846264338327950288;
    let q = [0, 0, 0, 0];
    x *= (M_PI / 360);
    y *= (M_PI / 360);
    z *= (M_PI / 360);
    const sinX = Math.sin(x);
    const cosX = Math.cos(x);
    const sinY = Math.sin(y);
    const cosY = Math.cos(y);
    const sinZ = Math.sin(z);
    const cosZ = Math.cos(z);
    q[0] = cosY * cosX * cosZ + sinY * sinX * sinZ;
    q[1] = cosY * sinX * cosZ + sinY * cosX * sinZ;
    q[2] = sinY * cosX * cosZ - cosY * sinX * sinZ;
    q[3] = cosY * cosX * sinZ - sinY * sinX * cosZ;
    return q;
}

export = AvatarController;