import { Command } from 'commander';
import chalk from 'chalk';
import { findNodeByPrefix } from '../../core/store';
import { getConnections } from '../../core/graph';
import { NodeKind } from '../../types';

export const childrenCommand = new Command('children')
  .argument('<id>', 'Parent node ID (or prefix)')
  .option('--kind <kind>', 'Filter children by kind')
  .option('--format <fmt>', 'Output format: text or json', 'text')
  .description('List child nodes (outgoing "contains" edges)')
  .action(async (idRaw: string, opts) => {
    const node = findNodeByPrefix(idRaw);
    if (!node) {
      console.error(chalk.red(`Node not found: ${idRaw}`));
      process.exit(1);
    }

    const conns = getConnections(node.id);
    let children = conns.outgoing.filter(c => c.type === 'contains');

    if (opts.kind) {
      children = children.filter(c => c.node.kind === opts.kind);
    }

    if (opts.format === 'json') {
      console.log(JSON.stringify(children.map(c => ({
        id: c.node.id,
        kind: c.node.kind,
        title: c.node.title,
        status: c.node.status,
      })), null, 2));
      return;
    }

    if (children.length === 0) {
      console.log(chalk.dim('No children.'));
      return;
    }

    console.log(chalk.bold(`Children of [${node.kind}] ${node.title}:`));
    for (const c of children) {
      console.log(`  ${c.node.id.slice(0, 8)} [${c.node.kind}] ${c.node.title}`);
    }
  });