/**
 * ─────────────────────────────────────────────
 *  SPB Git — Personal Git Platform
 * ─────────────────────────────────────────────
 *  Author  : Simon-Pierre Boucher
 *  Contact : contact@spboucher.ai
 *  File    : cli/commands/doctor.mjs
 *  Purpose : `spbgit doctor` — diagnose config, git, server, token
 *  License : MIT © Simon-Pierre Boucher
 * ─────────────────────────────────────────────
 */

import { existsSync } from 'node:fs';
import pc from 'picocolors';
import { loadCliConfig, CONFIG_PATH } from '../lib/config.mjs';
import { git } from '../lib/git.mjs';
import { EXIT } from '../lib/api.mjs';

export function registerDoctor(program) {
  program
    .command('doctor')
    .description('diagnose the local setup end to end')
    .action(async () => {
      let failures = 0;
      const check = (ok, label, hint) => {
        console.log(`${ok ? pc.green('✓') : pc.red('✗')} ${label}${ok || !hint ? '' : pc.dim(` — ${hint}`)}`);
        if (!ok) failures += 1;
      };

      const config = loadCliConfig();
      check(Boolean(config), `config present (${CONFIG_PATH})`, 'run: spbgit init');

      const gitVersion = await git(process.cwd(), ['--version']);
      check(gitVersion.ok, `git installed ${gitVersion.ok ? pc.dim(gitVersion.stdout.trim()) : ''}`, 'install git');

      if (config) {
        check(existsSync(config.workspace), `workspace exists (${config.workspace})`, 'run: spbgit init');

        let health = null;
        try {
          const response = await fetch(`${config.server}/healthz`);
          health = response.ok ? await response.json() : null;
        } catch {
          health = null;
        }
        check(Boolean(health), `server reachable (${config.server})`, 'check network / server process');
        if (health) {
          console.log(pc.dim(`  uptime ${health.uptimeSeconds}s · ${health.repos} repos · cache ${health.cache.files} files`));
        }

        if (config.token) {
          let who = null;
          try {
            const response = await fetch(`${config.server}/api/v1/whoami`, {
              headers: { Authorization: `Bearer ${config.token}` },
            });
            who = response.ok ? await response.json() : null;
          } catch {
            who = null;
          }
          check(Boolean(who), `token valid${who ? pc.dim(` (label: ${who.tokenLabel})`) : ''}`, 'run: spbgit token new, then spbgit init');
        } else {
          check(false, 'token configured', 'run: spbgit init');
        }
      }

      console.log('');
      if (failures === 0) console.log(pc.green('All checks passed — you are ready to push.'));
      else {
        console.log(pc.red(`${failures} check(s) failed.`));
        process.exit(EXIT.NETWORK);
      }
    });
}