import { fileUtils } from '../utils/fileUtils';
import { Layout } from '../models/types';

interface ListOptions {
  format?: 'table' | 'json';
  verbose?: boolean;
}

export async function listLayouts(options: ListOptions): Promise<void> {
  await fileUtils.initialize();

  const layouts = await fileUtils.listLayouts();
  if (layouts.length === 0) {
    console.log('No layouts found. Use "save" command to create your first layout.');
    return;
  }

  const layoutDetails: Array<{
    name: string;
    terminalType: string;
    windows: number;
    description: string;
    updatedAt: string;
  }> = [];

  for (const layoutFile of layouts) {
    try {
      const layout = await fileUtils.readLayout(layoutFile) as Layout;
      layoutDetails.push({
        name: layoutFile.replace(/\.(json|yaml|yml)$/, ''),
        terminalType: layout.terminalType,
        windows: layout.session.windows.length,
        description: layout.metadata?.description || '-',
        updatedAt: layout.updatedAt,
      });
    } catch {
      layoutDetails.push({
        name: layoutFile,
        terminalType: 'unknown',
        windows: 0,
        description: 'Error reading layout',
        updatedAt: '-',
      });
    }
  }

  if (options.format === 'json') {
    console.log(JSON.stringify(layoutDetails, null, 2));
    return;
  }

  const terminalTypeWidth = Math.max(12, ...layoutDetails.map((l) => l.terminalType.length));
  const nameWidth = Math.max(20, ...layoutDetails.map((l) => l.name.length));

  console.log('Saved Layouts');
  console.log('='.repeat(nameWidth + terminalTypeWidth + 60));
  console.log(
    `Name${' '.repeat(nameWidth - 4)} | Type${' '.repeat(terminalTypeWidth - 4)} | Windows | Description`
  );
  console.log('-'.repeat(nameWidth + terminalTypeWidth + 60));

  for (const layout of layoutDetails) {
    const name = layout.name.padEnd(nameWidth);
    const type = layout.terminalType.padEnd(terminalTypeWidth);
    const windows = String(layout.windows).padEnd(7);
    const desc = layout.description.substring(0, 30);
    console.log(`${name} | ${type} | ${windows} | ${desc}`);
  }

  console.log(`\nTotal: ${layouts.length} layout(s)`);

  if (options.verbose) {
    console.log('\nLayout Directory:', fileUtils.getLayoutsDir());
  }
}