// Copyright (c) 2020-2025, Brandon Lehmann
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
//    used to endorse or promote products derived from this software without specific
//    prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import { CryptoModule } from '../types';
export * from '../types';

export default class Crypto extends CryptoModule {
    /**
     * We cannot create a new instance using this method as we need to await the
     * loading of an underlying module, hence, we need to await the static
     * init() method on this class to receive an instance of the class
     *
     * @protected
     */

    protected constructor () {
        super();
    }

    /**
     * Initializes a new instance of this class after attempting to load
     * the underlying cryptographic library in the order the fastest
     * running library to the slowest
     *
     * @param externalLibrary
     */
    public static async init (
        externalLibrary: Partial<CryptoModule.Interface> = {}
    ): Promise<Crypto> {
        this.external_library = externalLibrary;

        if (!this.runtime_configuration.library) {
            if (await this.load_node_library()) {
                return new Crypto();
            }

            if (await this.load_wasm_library()) {
                return new Crypto();
            }

            if (await this.load_js_library()) {
                return new Crypto();
            }

            throw new Error('Could not initialize an underlying library');
        }

        return new Crypto();
    }

    /**
     * Forces the library to use the Javascript ASM.js underlying
     * cryptographic library if it can
     */
    public static async force_js_library (): Promise<boolean> {
        return this.load_js_library();
    }

    /**
     * Forces the library to use the WASM underlying cryptographic
     * library if it can
     */
    public static async force_wasm_library (): Promise<boolean> {
        return this.load_wasm_library();
    }

    /**
     * Attempts to load the Node.js C++ Addon module as the underlying
     * cryptographic library
     *
     * @private
     */
    private static async load_node_library (): Promise<boolean> {
        const imported = await import('./loaders/node');

        if (typeof imported.default === 'undefined') {
            return false;
        }

        const module = await imported.default();

        if (module) {
            CryptoModule.runtime_configuration = {
                type: CryptoModule.Type.NODE,
                library: module
            };

            return true;
        }

        return false;
    }

    /**
     * Attempts to load the Javascript ASM.js module as the underlying
     * cryptographic library
     *
     * @private
     */
    private static async load_js_library (): Promise<boolean> {
        const imported = await import('./loaders/javascript');

        if (typeof imported.default === 'undefined') {
            return false;
        }

        const module = await imported.default();

        if (module) {
            CryptoModule.runtime_configuration = {
                type: CryptoModule.Type.JS,
                library: module
            };

            return true;
        }

        return false;
    }

    /**
     * Attempts to load the WASM module as the underlying cryptographic
     * library
     *
     * @private
     */
    private static async load_wasm_library (): Promise<boolean> {
        const imported = await import('./loaders/wasm');

        if (typeof imported.default === 'undefined') {
            return false;
        }

        const module = await imported.default();

        if (module) {
            CryptoModule.runtime_configuration = {
                type: CryptoModule.Type.WASM,
                library: module
            };

            return true;
        }

        return false;
    }
}

export { Crypto };