// luma.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
import { assert, checkProps } from '@luma.gl/core';
import { GL } from '@luma.gl/constants';
import { getTypedArrayFromGLType } from "./typed-array-utils.js";
const DEFAULT_ACCESSOR_VALUES = {
    offset: 0,
    stride: 0,
    type: 5126,
    size: 1,
    divisor: 0,
    normalized: false,
    integer: false
};
const PROP_CHECKS = {
    deprecatedProps: {
        instanced: 'divisor',
        isInstanced: 'divisor'
    }
};
export class Accessor {
    offset;
    stride;
    type;
    size;
    divisor;
    normalized;
    integer;
    buffer;
    index;
    static getBytesPerElement(accessor) {
        // TODO: using `FLOAT` when type is not specified,
        // ensure this assumption is valid or force API to specify type.
        const ArrayType = getTypedArrayFromGLType(accessor.type || 5126);
        return ArrayType.BYTES_PER_ELEMENT;
    }
    static getBytesPerVertex(accessor) {
        assert(accessor.size);
        // TODO: using `FLOAT` when type is not specified,
        // ensure this assumption is valid or force API to specify type.
        const ArrayType = getTypedArrayFromGLType(accessor.type || 5126);
        return ArrayType.BYTES_PER_ELEMENT * accessor.size;
    }
    // Combines (merges) a list of accessors. On top of default values
    // Usually [programAccessor, bufferAccessor, appAccessor]
    // All props will be set in the returned object.
    // TODO check for conflicts between values in the supplied accessors
    static resolve(...accessors) {
        return new Accessor(...[DEFAULT_ACCESSOR_VALUES, ...accessors]); // Default values
    }
    constructor(...accessors) {
        accessors.forEach(accessor => this._assign(accessor)); // Merge in sequence
        Object.freeze(this);
    }
    toString() {
        return JSON.stringify(this);
    }
    // ACCESSORS
    // TODO - remove>
    get BYTES_PER_ELEMENT() {
        return Accessor.getBytesPerElement(this);
    }
    get BYTES_PER_VERTEX() {
        return Accessor.getBytesPerVertex(this);
    }
    // PRIVATE
    // eslint-disable-next-line complexity, max-statements
    _assign(props = {}) {
        props = checkProps('Accessor', props, PROP_CHECKS);
        if (props.type !== undefined) {
            this.type = props.type;
            // Auto-deduce integer type?
            if (props.type === 5124 || props.type === 5125) {
                this.integer = true;
            }
        }
        if (props.size !== undefined) {
            this.size = props.size;
        }
        if (props.offset !== undefined) {
            this.offset = props.offset;
        }
        if (props.stride !== undefined) {
            this.stride = props.stride;
        }
        // @ts-expect-error
        if (props.normalize !== undefined) {
            // @ts-expect-error
            this.normalized = props.normalize;
        }
        if (props.normalized !== undefined) {
            this.normalized = props.normalized;
        }
        if (props.integer !== undefined) {
            this.integer = props.integer;
        }
        // INSTANCE DIVISOR
        if (props.divisor !== undefined) {
            this.divisor = props.divisor;
        }
        // Buffer is optional
        if (props.buffer !== undefined) {
            this.buffer = props.buffer;
        }
        // The binding index (for binding e.g. Transform feedbacks and Uniform buffers)
        // TODO - should this be part of accessor?
        if (props.index !== undefined) {
            if (typeof props.index === 'boolean') {
                this.index = props.index ? 1 : 0;
            }
            else {
                this.index = props.index;
            }
        }
        // DEPRECATED
        // @ts-expect-error
        if (props.instanced !== undefined) {
            // @ts-expect-error
            this.divisor = props.instanced ? 1 : 0;
        }
        // @ts-expect-error
        if (props.isInstanced !== undefined) {
            // @ts-expect-error
            this.divisor = props.isInstanced ? 1 : 0;
        }
        if (this.offset === undefined)
            delete this.offset;
        if (this.stride === undefined)
            delete this.stride;
        if (this.type === undefined)
            delete this.type;
        if (this.size === undefined)
            delete this.size;
        if (this.divisor === undefined)
            delete this.divisor;
        if (this.normalized === undefined)
            delete this.normalized;
        if (this.integer === undefined)
            delete this.integer;
        if (this.buffer === undefined)
            delete this.buffer;
        if (this.index === undefined)
            delete this.index;
        return this;
    }
}
// TEST EXPORTS
export { DEFAULT_ACCESSOR_VALUES };