import fs from "fs";
import path from "path";
import zlib from 'zlib';
// Find the package root (based on the nyc output/ folder)
const root = (function () {
    let root = process.cwd();
    while (true) {
        if (fs.existsSync(path.join(root, "output"))) {
            return root;
        }
        const parent = path.join(root, "..");
        if (parent === root) {
            break;
        }
        root = parent;
    }
    throw new Error("could not find root");
})();
// Load the tests
export function loadTests(tag) {
    const filename = path.resolve(root, "testcases", tag + ".json.gz");
    return JSON.parse(zlib.gunzipSync(fs.readFileSync(filename)).toString());
}
export function log(context, text) {
    if (context && context.test && typeof (context.test._ethersLog) === "function") {
        context.test._ethersLog(text);
    }
    else {
        console.log(text);
    }
}
async function stall(duration) {
    return new Promise((resolve) => { setTimeout(resolve, duration); });
}
const ATTEMPTS = 5;
export async function retryIt(name, func) {
    it(name, async function () {
        this.timeout(ATTEMPTS * 5000);
        for (let i = 0; i < ATTEMPTS; i++) {
            try {
                await func.call(this);
                return;
            }
            catch (error) {
                if (error.message === "sync skip; aborting execution") {
                    // Skipping a test; let mocha handle it
                    throw error;
                }
                else if (error.code === "ERR_ASSERTION") {
                    // Assertion error; let mocha scold us
                    throw error;
                }
                else {
                    if (i === ATTEMPTS - 1) {
                        stats.pushRetry(i, name, error);
                    }
                    else {
                        await stall(500 * (1 << i));
                        stats.pushRetry(i, name, null);
                    }
                }
            }
        }
        // All hope is lost.
        throw new Error(`Failed after ${ATTEMPTS} attempts; ${name}`);
    });
}
const _guard = {};
export class Stats {
    #stats;
    constructor(guard) {
        if (guard !== _guard) {
            throw new Error("private constructor");
        }
        this.#stats = [];
    }
    #currentStats() {
        if (this.#stats.length === 0) {
            throw new Error("no active stats");
        }
        return this.#stats[this.#stats.length - 1];
    }
    pushRetry(attempt, line, error) {
        const { retries } = this.#currentStats();
        if (attempt > 0) {
            retries.pop();
        }
        if (retries.length < 100) {
            retries.push({
                message: `${attempt + 1} failures: ${line}`,
                error
            });
        }
    }
    start(name) {
        this.#stats.push({ name, retries: [] });
    }
    end(context) {
        let log = console.log.bind(console);
        if (context && typeof (context._ethersLog) === "function") {
            log = context._ethersLog;
        }
        const { name, retries } = this.#currentStats();
        if (retries.length === 0) {
            return;
        }
        log(`Warning: The following tests required retries (${name})`);
        retries.forEach(({ error, message }) => {
            log("  " + message);
            if (error) {
                log(error);
            }
        });
    }
}
export const stats = new Stats(_guard);
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