import { Command } from "commander";
import chalk from "chalk";
import { PLATFORM_REGISTRY } from "../lib/install-path.js";

/**
 * `skills-hub list-platforms`, print the platform registry with detection
 * status. Useful for users who want to know which AI agents the CLI will
 * install to when they run `skills-hub install <slug>`.
 */
export const listPlatformsCommand = new Command("list-platforms")
  .description(
    "List all supported install targets and whether each is detected on this machine",
  )
  .option("--json", "Output as JSON")
  .action((options: { json?: boolean }) => {
    const rows = PLATFORM_REGISTRY.map((p) => ({
      id: p.id,
      label: p.label,
      detected: p.detect(),
      format: p.format,
      path: p.paths[0],
    }));

    if (options.json) {
      console.log(JSON.stringify(rows, null, 2));
      return;
    }

    console.log(chalk.bold("Supported install targets:"));
    console.log("");
    const idWidth = Math.max(...rows.map((r) => r.id.length));
    const labelWidth = Math.max(...rows.map((r) => r.label.length));
    for (const r of rows) {
      const status = r.detected
        ? chalk.green("detected")
        : chalk.dim("not detected");
      console.log(
        `  ${r.id.padEnd(idWidth)}  ${r.label.padEnd(labelWidth)}  ${status}  ${chalk.dim(r.path)}`,
      );
    }
    console.log("");
    console.log(
      chalk.dim(
        "Use --target=<id>[,<id>...] or --all with `skills-hub install`.",
      ),
    );
  });