import { createInterface } from "readline";
import chalk from "chalk";
import { writeConfig, readConfig, getRegistryUrl } from "../lib/config.js";

export async function loginCommand(options: {
  credential?: string;
  registryUrl?: string;
}): Promise<void> {
  const registryUrl = options.registryUrl ?? getRegistryUrl();

  let credential = options.credential;

  if (!credential) {
    credential = await promptHidden(
      "Enter your publish credential (psk_ns_*): "
    );
  }

  if (!credential || credential.trim().length === 0) {
    console.error(chalk.red("Error: credential cannot be empty."));
    process.exit(1);
  }

  credential = credential.trim();

  if (!credential.startsWith("psk_ns_")) {
    console.error(
      chalk.red(
        "Error: credential must start with psk_ns_.\n" +
          "  Get yours at https://www.paperclipskills.com/publisher"
      )
    );
    process.exit(1);
  }

  writeConfig({
    token: credential,
    registryUrl: options.registryUrl ?? registryUrl,
    savedAt: new Date().toISOString(),
  });

  console.log(
    chalk.green("✓ Credential saved to ~/.paperclip-skills/config.json")
  );
  console.log(
    chalk.dim(
      "  Run `npx paperclip-skills publish` to publish your first skill."
    )
  );
}

function promptHidden(question: string): Promise<string> {
  return new Promise((resolve) => {
    const rl = createInterface({
      input: process.stdin,
      output: process.stdout,
    });

    if (process.stdout.isTTY) {
      process.stdout.write(question);
      process.stdin.setRawMode?.(true);
      let chars = "";
      process.stdin.resume();
      process.stdin.setEncoding("utf8");
      process.stdin.on("data", function onData(char: string) {
        if (char === "\r" || char === "\n") {
          process.stdin.setRawMode?.(false);
          process.stdin.removeListener("data", onData);
          process.stdout.write("\n");
          rl.close();
          resolve(chars);
        } else if (char === "\u0003") {
          process.exit();
        } else if (char === "\u007f") {
          chars = chars.slice(0, -1);
        } else {
          chars += char;
        }
      });
    } else {
      rl.question(question, (answer) => {
        rl.close();
        resolve(answer);
      });
    }
  });
}