#!/usr/bin/env bun

/**
 * Remove one or more versions of a @suaveplan/* package from the Verdaccio
 * registry at https://npmjs.fq.io/. Used when a forced-republish accidentally
 * bumped a genesis package past 0.0.0 and we want to reclaim the version.
 *
 * Usage:
 *   bun scripts/unpublish.ts --package @suaveplan/foo --version 0.0.1
 *   bun scripts/unpublish.ts --package @suaveplan/foo --version 0.0.1 --confirm
 *   bun scripts/unpublish.ts --package @suaveplan/foo --all --confirm
 *
 * Defaults to dry-run — nothing is deleted unless `--confirm` is passed.
 *
 * Requires `NPM_TOKEN` in .env with unpublish scope on the Verdaccio registry.
 * (Verified: the token currently in use has unpublish rights.)
 */

import { execFile } from "node:child_process";
import { promisify } from "node:util";
import { CONFIG } from "./lib/config.js";

const execFileAsync = promisify(execFile);

const REGISTRY = CONFIG.registry.verdaccio.url;

interface CliOptions {
    package: string | null;
    version: string | null;
    all: boolean;
    confirm: boolean;
}

function parseArgs(argv: readonly string[]): CliOptions {
    const opts: CliOptions = {
        package: null,
        version: null,
        all: false,
        confirm: false,
    };
    for (let i = 0; i < argv.length; i++) {
        const arg = argv[i];
        if (arg === "--package") {
            opts.package = argv[++i] ?? null;
        } else if (arg === "--version") {
            opts.version = argv[++i] ?? null;
        } else if (arg === "--all") {
            opts.all = true;
        } else if (arg === "--confirm") {
            opts.confirm = true;
        }
    }
    return opts;
}

function printHelp(): void {
    console.log(`Usage:
  bun scripts/unpublish.ts --package <@suaveplan/name> --version <version>
  bun scripts/unpublish.ts --package <@suaveplan/name> --all

Flags:
  --confirm     Actually perform the unpublish (default is dry-run)

Examples:
  bun scripts/unpublish.ts --package @suaveplan/error --version 0.0.1
  bun scripts/unpublish.ts --package @suaveplan/error --version 0.0.1 --confirm
  bun scripts/unpublish.ts --package @suaveplan/error --all --confirm`);
}

async function listVersions(pkg: string): Promise<string[]> {
    try {
        const { stdout } = await execFileAsync("npm", [
            "view",
            pkg,
            "versions",
            "--json",
            `--registry=${REGISTRY}`,
        ]);
        const parsed = JSON.parse(stdout) as string | string[];
        return Array.isArray(parsed) ? parsed : [parsed];
    } catch {
        return [];
    }
}

async function unpublishOne(pkg: string, version: string): Promise<void> {
    await execFileAsync("npm", [
        "unpublish",
        `${pkg}@${version}`,
        "--force",
        `--registry=${REGISTRY}`,
    ]);
}

function validatePackageName(name: string): void {
    if (!name.startsWith("@suaveplan/")) {
        throw new Error(
            `Package must start with '@suaveplan/' — refusing to operate on '${name}'.`
        );
    }
    // Defence in depth: block path traversal / shell metacharacters even
    // though execFile doesn't invoke a shell.
    if (!/^@suaveplan\/[a-z0-9-]+$/.test(name)) {
        throw new Error(
            `Package name '${name}' fails strict validation (lowercase, digits, hyphens only).`
        );
    }
}

function validateVersion(v: string): void {
    if (!/^\d+\.\d+\.\d+(?:-[0-9a-zA-Z.-]+)?$/.test(v)) {
        throw new Error(`Version '${v}' is not a valid semver.`);
    }
}

async function main(): Promise<void> {
    const opts = parseArgs(process.argv.slice(2));
    if (opts.package === null) {
        printHelp();
        process.exit(1);
    }
    validatePackageName(opts.package);

    const existing = await listVersions(opts.package);
    if (existing.length === 0) {
        console.log(`No versions of ${opts.package} found on ${REGISTRY}.`);
        return;
    }

    let targets: string[];
    if (opts.all) {
        targets = existing;
    } else if (opts.version !== null) {
        validateVersion(opts.version);
        if (!existing.includes(opts.version)) {
            console.log(
                `Version ${opts.version} not found on registry for ${opts.package}. Existing: ${existing.join(", ")}`
            );
            return;
        }
        targets = [opts.version];
    } else {
        console.error("Must pass either --version <v> or --all.");
        printHelp();
        process.exit(1);
    }

    console.log(`Package: ${opts.package}`);
    console.log(`Registry: ${REGISTRY}`);
    console.log(`Versions to unpublish: ${targets.join(", ")}`);
    console.log(
        `Remaining after op:    ${
            existing.filter((v) => !targets.includes(v)).join(", ") || "(none)"
        }`
    );

    if (!opts.confirm) {
        console.log("\n🔍 DRY RUN — pass --confirm to actually unpublish.");
        return;
    }

    for (const version of targets) {
        process.stdout.write(`  • ${opts.package}@${version} ... `);
        try {
            await unpublishOne(opts.package, version);
            console.log("✅");
        } catch (err) {
            console.log(`❌ ${(err as Error).message}`);
            process.exit(1);
        }
    }

    console.log(`\nDone. ${targets.length} version(s) unpublished.`);
}

main().catch((err) => {
    console.error(err);
    process.exit(1);
});