const db = require('../config/db');

const DEFAULTS = {
  device_renewal: true,
  device_suspended: true,
  device_paused: true,
  billing_reminder: true,
  payout_completed: true,
  payout_failed: true,
  trial_granted: true,
  purchase_alerts: true,
  system_alerts: true,
};

const OPTION_DEFS = [
  {
    key: 'device_renewal',
    label: 'Device renewal',
    description: 'Sent when a device subscription payment succeeds and the device is renewed.',
    default_enabled: true,
  },
  {
    key: 'device_suspended',
    label: 'Device suspended',
    description: 'Sent when a device is suspended because billing expired or admin suspended it.',
    default_enabled: true,
  },
  {
    key: 'device_paused',
    label: 'Device paused',
    description: 'Sent when you manually pause a device from the dashboard.',
    default_enabled: true,
  },
  {
    key: 'billing_reminder',
    label: 'Billing reminders',
    description: 'Sent before a device trial or subscription is about to expire.',
    default_enabled: true,
  },
  {
    key: 'payout_completed',
    label: 'Payout completed',
    description: 'Sent when a payout to your phone succeeds.',
    default_enabled: true,
  },
  {
    key: 'payout_failed',
    label: 'Payout failed',
    description: 'Sent when a payout fails and your balance is restored.',
    default_enabled: true,
  },
  {
    key: 'trial_granted',
    label: 'Trial granted',
    description: 'Sent when an admin grants a trial period to one of your devices.',
    default_enabled: true,
  },
  {
    key: 'purchase_alerts',
    label: 'Purchase alerts',
    description: 'Show an in-app alert when a guest buys a WiFi bundle.',
    default_enabled: true,
  },
  {
    key: 'system_alerts',
    label: 'System alerts',
    description: 'Show in-app device and controller alerts from Omada.',
    default_enabled: true,
  },
];

function normalizeRow(row) {
  const prefs = {};
  for (const [key, defaultValue] of Object.entries(DEFAULTS)) {
    prefs[key] = row ? Boolean(row[key]) : defaultValue;
  }
  return prefs;
}

async function getNotificationPreferences(clientId) {
  const row = await db.queryOne(
    `SELECT client_id, device_renewal, device_suspended, device_paused,
            billing_reminder, payout_completed, payout_failed, trial_granted,
            purchase_alerts, system_alerts
     FROM client_notification_preferences
     WHERE client_id = ?`,
    [clientId]
  );

  return normalizeRow(row);
}

async function upsertNotificationPreferences(clientId, input) {
  const merged = { ...(await getNotificationPreferences(clientId)), ...input };

  await db.query(
    `INSERT INTO client_notification_preferences
       (client_id, device_renewal, device_suspended, device_paused,
        billing_reminder, payout_completed, payout_failed, trial_granted,
        purchase_alerts, system_alerts)
     VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
     ON DUPLICATE KEY UPDATE
       device_renewal = VALUES(device_renewal),
       device_suspended = VALUES(device_suspended),
       device_paused = VALUES(device_paused),
       billing_reminder = VALUES(billing_reminder),
       payout_completed = VALUES(payout_completed),
       payout_failed = VALUES(payout_failed),
       trial_granted = VALUES(trial_granted),
       purchase_alerts = VALUES(purchase_alerts),
       system_alerts = VALUES(system_alerts)`,
    [
      clientId,
      merged.device_renewal ? 1 : 0,
      merged.device_suspended ? 1 : 0,
      merged.device_paused ? 1 : 0,
      merged.billing_reminder ? 1 : 0,
      merged.payout_completed ? 1 : 0,
      merged.payout_failed ? 1 : 0,
      merged.trial_granted ? 1 : 0,
      merged.purchase_alerts ? 1 : 0,
      merged.system_alerts ? 1 : 0,
    ]
  );

  return getNotificationPreferences(clientId);
}

async function canSendTenantNotification(clientId, key) {
  const prefs = await getNotificationPreferences(clientId);
  return prefs[key] ?? true;
}

function serializePreferenceOptions(preferences) {
  return OPTION_DEFS.map(option => ({
    ...option,
    enabled: preferences[option.key] ?? option.default_enabled,
  }));
}

module.exports = {
  DEFAULTS,
  OPTION_DEFS,
  getNotificationPreferences,
  upsertNotificationPreferences,
  canSendTenantNotification,
  serializePreferenceOptions,
};