const Admin = require('../models/Admin');
const AuditLog = require('../models/AuditLog');

exports.list = async () => {
  return Admin.find().populate('assignedMarkets', 'name code').sort('profile.firstName');
};

exports.create = async ({ email, password, role, profile, assignedMarkets }, actorId, ip) => {
  if (!email || !password || !role) throw Object.assign(new Error('Email, password, and role are required.'), { statusCode: 400 });
  if (password.length < 12) throw Object.assign(new Error('Password must be at least 12 characters.'), { statusCode: 400 });

  const admin = await Admin.create({
    email,
    passwordHash: password,
    role,
    profile,
    assignedMarkets: assignedMarkets || [],
  });
  await admin.populate('assignedMarkets', 'name code');

  await AuditLog.create({ action: 'admin_user_created', actor: actorId, targetType: 'admin', targetId: admin._id, details: { role, email }, ipAddress: ip });
  return admin;
};

exports.update = async (id, { role, profile, assignedMarkets, password }, actorId, ip) => {
  const admin = await Admin.findById(id);
  if (!admin) throw Object.assign(new Error('Admin user not found.'), { statusCode: 404 });

  if (role) admin.role = role;
  if (profile) admin.profile = { ...admin.profile.toObject?.() || admin.profile, ...profile };
  if (assignedMarkets) admin.assignedMarkets = assignedMarkets;
  if (password) {
    if (password.length < 12) throw Object.assign(new Error('Password must be at least 12 characters.'), { statusCode: 400 });
    admin.passwordHash = password;
  }

  await admin.save();
  await admin.populate('assignedMarkets', 'name code');

  await AuditLog.create({ action: 'admin_user_updated', actor: actorId, targetType: 'admin', targetId: admin._id, details: { updatedFields: Object.keys({ role, profile, assignedMarkets, password }).filter(k => arguments[1][k]) }, ipAddress: ip });
  return admin;
};

exports.deactivate = async (id, actorId, ip) => {
  const admin = await Admin.findById(id);
  if (!admin) throw Object.assign(new Error('Admin user not found.'), { statusCode: 404 });
  if (admin._id.toString() === actorId.toString()) {
    throw Object.assign(new Error('You cannot deactivate your own account.'), { statusCode: 400 });
  }

  admin.accountStatus = 'deactivated';
  admin.refreshToken = null;
  await admin.save({ validateModifiedOnly: true });

  await AuditLog.create({ action: 'admin_user_deactivated', actor: actorId, targetType: 'admin', targetId: admin._id, ipAddress: ip });
};

exports.getAuditLog = async (id) => {
  const admin = await Admin.findById(id).select('email profile loginAudit');
  if (!admin) throw Object.assign(new Error('Admin user not found.'), { statusCode: 404 });

  const auditEntries = await AuditLog.find({ actor: id }).sort({ timestamp: -1 }).limit(100);
  return { admin: { email: admin.email, profile: admin.profile }, loginAudit: admin.loginAudit.slice(-20), auditEntries };
};