import { File } from "../core/File";
import { WorkFlowContext } from "../core/WorkflowContext";
import { Plugin } from "../core/WorkflowContext";
import { utils } from "realm-utils";
import { extractExtension, string2RegExp } from "../Utils";

export interface RawPluginOptionsObj {
    extensions: string[];
}

export type RawPluginOptions = RawPluginOptionsObj | string[];

/**
 * @export
 * @class RawPluginClass
 * @implements {Plugin}
 */
export class RawPluginClass implements Plugin {
	/**
	 * @type {RegExp}
	 * @memberOf RawPluginClass
	 */
    public test: RegExp = /.*/;
	/**
	 * @type {Array<string>}
	 * @memberOf RawPluginClass
	 */
    public extensions: Array<string>;

    constructor(options: RawPluginOptions | string[] = []) {
        if (utils.isPlainObject(options)) {
            if ("extensions" in (options || {})) this.extensions = (options as RawPluginOptionsObj).extensions;
        }
        if (utils.isArray(options)) {
            this.extensions = [];
            options.forEach(str => {
                this.extensions.push("." + extractExtension(str));
            });
            this.test = string2RegExp(options.join("|"));
        }
    }

    init(context: WorkFlowContext) {
        if (Array.isArray(this.extensions)) {
            return this.extensions.forEach(ext => context.allowExtension(ext));
        }
    }

    transform(file: File) {
        const context = file.context;
        if (context.useCache) {
            let cached = context.cache.getStaticCache(file);
            if (cached) {
                file.isLoaded = true;
                file.analysis.skip();
                file.sourceMap = undefined;
                file.contents = cached.contents;
                return;
            }
        }
        file.loadContents();
        file.sourceMap = undefined;
        file.contents = `module.exports = ${JSON.stringify(file.contents)}`;
        if (context.useCache) {
            context.emitJavascriptHotReload(file);
            context.cache.writeStaticCache(file, file.sourceMap);
        }
    }
}

export const RawPlugin = (options?: RawPluginOptions) => {
    return new RawPluginClass(options);
};