const MatrixRepository = require('../../repositories/matrix/MatrixRepository');
const Matrix = require('../../models/Matrix');

function isAdmin(user) {
  return !!user && ['admin', 'super_admin'].includes(user.role);
}

function isValidEmail(s) {
  return typeof s === 'string' && /\S+@\S+\.\S+/.test(s);
}

async function create({ name, topNodeEmail, force = false, actorUser }) {
  if (!actorUser) {
    const err = new Error('Unauthorized');
    err.status = 401;
    throw err;
  }
  if (!isAdmin(actorUser)) {
    const err = new Error('Forbidden: Admins only');
    err.status = 403;
    throw err;
  }
  const trimmedName = (name || '').trim();
  if (!trimmedName) {
    const err = new Error('Matrix name is required');
    err.status = 400;
    throw err;
  }
  if (trimmedName.length > 255) {
    const err = new Error('Matrix name is too long');
    err.status = 400;
    throw err;
  }
  const email = (topNodeEmail || '').trim().toLowerCase();
  if (!isValidEmail(email)) {
    const err = new Error('Valid top node email is required');
    err.status = 400;
    throw err;
  }

  const res = await MatrixRepository.createMatrix({ name: trimmedName, topNodeEmail: email, force });

  return new Matrix({
    name: res.name,
    masterTopUserId: res.masterTopUserId,
    masterTopUserEmail: res.masterTopUserEmail
  });
}

async function getStats({ actorUser }) {
  if (!actorUser) {
    const err = new Error('Unauthorized');
    err.status = 401;
    throw err;
  }
  if (!isAdmin(actorUser)) {
    const err = new Error('Forbidden: Admins only');
    err.status = 403;
    throw err;
  }

  const stats = await MatrixRepository.getMatrixStats();

  // Keep the response shape straightforward for the dashboard
  return {
    activeMatrices: stats.activeMatrices,
    totalMatrices: stats.totalMatrices,
    totalUsersSubscribed: stats.totalUsersSubscribed,
    matrices: stats.matrices.map(m => ({
      rootUserId: m.rootUserId,
      name: m.name,
      isActive: !!m.isActive,
      usersCount: m.usersCount,
      createdAt: m.createdAt, // equals ego_activated_at
      topNodeEmail: m.topNodeEmail
    }))
  };
}

module.exports = {
  create,
  getStats
};