import type FaustCompiler from './FaustCompiler';

interface IFaustSvgDiagrams {
    /**
     * Generates auxiliary files from Faust code. The output depends on the compiler options.
     *
     * @param name - the DSP's name
     * @param code - Faust code
     * @param args - compilation args
     * @returns the svg diagrams as a filename - svg string map
     */
    from(name: string, code: string, args: string): Record<string, string>;
}

class FaustSvgDiagrams implements IFaustSvgDiagrams {
    private compiler: FaustCompiler;

    constructor(compiler: FaustCompiler) {
        this.compiler = compiler;
    }

    from(name: string, code: string, args: string) {
        const fs = this.compiler.fs();
        try {
            const files: string[] = fs.readdir(`/${name}-svg/`);
            files
                .filter((file) => file !== '.' && file !== '..')
                .forEach((file) => fs.unlink(`/${name}-svg/${file}`));
        } catch {}
        const success = this.compiler.generateAuxFiles(
            name,
            code,
            `-lang wasm -o binary -svg ${args}`
        );
        if (!success) throw new Error(this.compiler.getErrorMessage());
        const svgs: Record<string, string> = {};
        const files: string[] = fs.readdir(`/${name}-svg/`);
        files
            .filter((file) => file !== '.' && file !== '..')
            .forEach(
                (file) =>
                    (svgs[file] = fs.readFile(`/${name}-svg/${file}`, {
                        encoding: 'utf8'
                    }) as string)
            );
        return svgs;
    }
}

export default FaustSvgDiagrams;