import {describe} from 'mocha'
import {exec} from "child_process";

/**
 *
 * @param forbidden: a GREP-regex. This means that '.' is a wildcard and should be escaped to match a literal dot
 * @param reason
 * @private
 */
function detectInCode(forbidden: string, reason: string) {

    const excludedDirs = [".git", "node_modules", "dist", ".cache", ".parcel-cache", "assets", "vendor"]

    exec("grep -n \"" + forbidden + "\" -r . " + excludedDirs.map(d => "--exclude-dir=" + d).join(" "), ((error, stdout, stderr) => {
        if (error?.message?.startsWith("Command failed: grep")) {
            console.warn("Command failed!")
            return;
        }
        if (error !== null) {
            throw error

        }
        if (stderr !== "") {
            throw stderr
        }

        const found = stdout.split("\n").filter(s => s !== "").filter(s => !s.startsWith("./test/"));
        if (found.length > 0) {
            throw `Found a '${forbidden}' at \n    ${found.join("\n     ")}.\n ${reason}`
        }

    }))
}

describe("Code quality", () => {
    it("should not contain reverse", () => {
        detectInCode("reverse()", "Reverse is stateful and changes the source list. This often causes subtle bugs")
    })

    it("should not contain 'constructor.name'", () => {
        detectInCode("constructor\\.name", "This is not allowed, as minification does erase names.")
    })
    
})