#!/usr/bin/env node
/**
 * Claude Code Status Line (Standalone)
 *
 * Designed for headless Linux servers — no browser, no tray app needed.
 *
 * Context window:  Always shown, read from stdin (JSON piped by Claude Code).
 * Token usage:     Optional. Reads from a cache file that can be populated by
 *                  the included fetcher (cron) or any external source.
 *
 * Output: Context ▓▓▓▓░░░░░░ 40% | Token ░░░░░░░░░░ 10% 267M
 */
const fs = require('fs');
const path = require('path');

// --- Config ---
const CACHE_FILE = process.env.CLAUDE_USAGE_CACHE
  || path.join(process.env.TMPDIR || process.env.TEMP || '/tmp', 'claude_usage.json');
const CACHE_MAX_AGE_S = parseInt(process.env.CLAUDE_USAGE_MAX_AGE || '900', 10); // 15 min default

// --- Bar renderer ---
function bar(pct, width) {
  width = width || 10;
  const filled = Math.floor(Math.min(100, Math.max(0, pct)) / (100 / width));
  return '\u2593'.repeat(filled) + '\u2591'.repeat(width - filled);
}

// --- Context Window ---
function getContextPart(data) {
  try {
    const pct = Math.round(parseFloat(data?.context_window?.used_percentage) || 0);
    return 'Context ' + bar(pct) + ' ' + pct + '%';
  } catch {
    return 'Context ' + '\u2591'.repeat(10);
  }
}

// --- Usage Cache ---
function readCache() {
  try {
    if (!fs.existsSync(CACHE_FILE)) return null;
    const stat = fs.statSync(CACHE_FILE);
    const ageS = (Date.now() - stat.mtimeMs) / 1000;
    if (ageS > CACHE_MAX_AGE_S) return null;
    return JSON.parse(fs.readFileSync(CACHE_FILE, 'utf8'));
  } catch {
    return null;
  }
}

function formatMinutes(isoStr) {
  if (!isoStr) return '';
  try {
    const remaining = Math.max(0, Math.round((new Date(isoStr).getTime() - Date.now()) / 60000));
    return remaining + 'M';
  } catch {
    return '';
  }
}

function getUsagePart(data) {
  if (!data) return '';
  const parts = [];

  if (data.five_hour && data.five_hour.utilization > 0) {
    const pct = Math.round(data.five_hour.utilization);
    const remaining = formatMinutes(data.five_hour.resets_at);
    parts.push('Token ' + bar(pct) + ' ' + pct + '%' + (remaining ? ' ' + remaining : ''));
  }

  if (data.seven_day && data.seven_day.utilization > 20) {
    const pct = Math.round(data.seven_day.utilization);
    parts.push('7d ' + pct + '%');
  }

  return parts.join(' | ');
}

// --- Main ---
function main() {
  let stdinData = {};
  try {
    stdinData = JSON.parse(fs.readFileSync(0, 'utf8'));
  } catch { /* no stdin or invalid JSON */ }

  const ctx = getContextPart(stdinData);
  const usage = getUsagePart(readCache());

  console.log(usage ? ctx + ' | ' + usage : ctx);
}

main();