export class Mat4 {

    constructor() {
        this.data = [
            1, 0, 0, 0,
            0, 1, 0, 0,
            0, 0, 1, 0,
            0, 0, 0, 1
        ]
    }

    set(m00, m01, m02, m03, m10, m11, m12, m13, m20, m21, m22, m23, m30, m31, m32, m33) {
        const d = this.data
        d[0] = m00; d[1] = m01; d[2] = m02; d[3] = m03;
        d[4] = m10; d[5] = m11; d[6] = m12; d[7] = m13;
        d[8] = m20; d[9] = m21; d[10] = m22; d[11] = m23;
        d[12] = m30; d[13] = m31; d[14] = m32; d[15] = m33;
        return this
    }

    clone() {
        return new Mat4().arr(this.da)
    }

    arr(arr, offset = 0) {
        for(let i = 0; i < 16; i++) {
            this.data[i] = arr[i + offset]
        }
        return this
    }

    identity() {
        this.set(
            1, 0, 0, 0,
            0, 1, 0, 0,
            0, 0, 1, 0,
            0, 0, 0, 1
        )
        return this
    }

    copy(m) {
        const d = this.data
        const o = m.data
        d[0] = o[0]; d[1] = o[1]; d[2] = o[2]; d[3] = o[3];
        d[4] = o[4]; d[5] = o[5]; d[6] = o[6]; d[7] = o[7];
        d[8] = o[8]; d[9] = o[9]; d[10] = o[10]; d[11] = o[11];
        d[12] = o[12]; d[13] = o[13]; d[14] = o[14]; d[15] = o[15];
        return this
    }

    pos(v) {
        const d = this.data

        const m30 = d[0] * v.x + d[4] * v.y + d[8] * v.z;
        const m31 = d[1] * v.x + d[5] * v.y + d[9] * v.z;
        const m32 = d[2] * v.x + d[6] * v.y + d[10] * v.z;
        const m33 = d[3] * v.x + d[7] * v.y + d[11] * v.z; 

		d[3] += m30;
        d[7] += m31;
        d[11] += m32;
        d[15] += m33;
		return this;
	}

    rot(v) {
        const da = this.data;
		const c3 = Math.cos(v.z)
        const s3 = Math.sin(v.z)
		const c2 = Math.cos(v.x)
        const s2 = Math.sin(v.x)
		const c1 = Math.cos(v.y)
        const s1 = Math.sin(v.y)

        da[0] = c1 * c3 + s1 * s2 * s3
        da[4] = c2 * s3
        da[8] = c1 * s2 * s3 - c3 * s1

        da[1] = c3 * s1 * s2 - c1 * s3
        da[5] = c2 * c3
        da[9] = c1 * c3 * s2 + s1 * s3

        da[2] = c2 * s1
        da[6] = -s2
        da[10] = c1 * c2

        return this
    }

    scale(v) {
		const d = this.data;

		d[0] *= v.x; d[1] *= v.y; d[2] *= v.z;
		d[4] *= v.x; d[5] *= v.y; d[6] *= v.z;
		d[8] *= v.x; d[9] *= v.y; d[10] *= v.z;
		d[12] *= v.x; d[13] *= v.y; d[14] *= v.z;

		return this;
	}

    get() {
        const d = this.data
        return new Float32Array([
            d[0], d[4], d[8], d[12],
            d[1], d[5], d[9], d[13],
            d[2], d[6], d[10], d[14],
            d[3], d[7], d[11], d[15] 
        ])
    }
}