const fs = require('fs');
const path = require('path');

const DATA_FILE = path.join(__dirname, '..', 'data', 'requests.json');

function ensureDataDir() {
  const dir = path.dirname(DATA_FILE);
  if (!fs.existsSync(dir)) {
    fs.mkdirSync(dir, { recursive: true });
  }
  if (!fs.existsSync(DATA_FILE)) {
    fs.writeFileSync(DATA_FILE, JSON.stringify([], null, 2));
  }
}

function readAll() {
  ensureDataDir();
  const raw = fs.readFileSync(DATA_FILE, 'utf8');
  return JSON.parse(raw);
}

function writeAll(data) {
  ensureDataDir();
  fs.writeFileSync(DATA_FILE, JSON.stringify(data, null, 2));
}

function createRequest(email, omgJobNumber) {
  const requests = readAll();
  const request = {
    id: Date.now().toString(36) + Math.random().toString(36).slice(2, 7),
    email: email.trim().toLowerCase(),
    omgJobNumber: omgJobNumber.trim(),
    status: 'pending',
    amountApproved: null,
    createdAt: new Date().toISOString(),
    processedAt: null,
  };
  requests.push(request);
  writeAll(requests);
  return request;
}

function getPending() {
  return readAll().filter(r => r.status === 'pending');
}

function getProcessed() {
  return readAll().filter(r => r.status !== 'pending');
}

function getAll() {
  return readAll();
}

function updateRequest(id, status, amountApproved) {
  const requests = readAll();
  const idx = requests.findIndex(r => r.id === id);
  if (idx === -1) return null;
  requests[idx].status = status;
  requests[idx].amountApproved = amountApproved || null;
  requests[idx].processedAt = new Date().toISOString();
  writeAll(requests);
  return requests[idx];
}

module.exports = {
  createRequest,
  getPending,
  getProcessed,
  getAll,
  updateRequest,
};