import crypto from 'node:crypto';

export const PUSH_PROVIDERS = {
  FCM: 'FCM',
  APNS: 'APNS',
  WEB_PUSH: 'WEB_PUSH',
};

export const PUSH_PLATFORMS = {
  IOS: 'IOS',
  ANDROID: 'ANDROID',
  WEB: 'WEB',
};

export function hashPushToken(pushToken) {
  return crypto.createHash('sha256').update(`${pushToken || ''}`).digest('hex');
}

export async function registerPushToken(client, {
  tenantId,
  userId,
  staffId = null,
  businessMembershipId = null,
  vendorMembershipId = null,
  provider = PUSH_PROVIDERS.FCM,
  platform,
  pushToken,
  deviceId = null,
  appVersion = null,
  appBuild = null,
  locale = null,
  timezone = null,
  notificationsEnabled = true,
  metadata = {},
}) {
  const tokenHash = hashPushToken(pushToken);
  const result = await client.query(
    `
    INSERT INTO device_push_tokens (
      tenant_id,
      user_id,
      staff_id,
      business_membership_id,
      vendor_membership_id,
      provider,
      platform,
      push_token,
      token_hash,
      device_id,
      app_version,
      app_build,
      locale,
      timezone,
      notifications_enabled,
      invalidated_at,
      invalidation_reason,
      last_registered_at,
      last_seen_at,
      metadata
    )
    VALUES (
      $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, NULL, NULL, NOW(), NOW(), $16::jsonb
    )
    ON CONFLICT (provider, token_hash) DO UPDATE
      SET tenant_id = EXCLUDED.tenant_id,
          user_id = EXCLUDED.user_id,
          staff_id = EXCLUDED.staff_id,
          business_membership_id = EXCLUDED.business_membership_id,
          vendor_membership_id = EXCLUDED.vendor_membership_id,
          platform = EXCLUDED.platform,
          push_token = EXCLUDED.push_token,
          device_id = EXCLUDED.device_id,
          app_version = EXCLUDED.app_version,
          app_build = EXCLUDED.app_build,
          locale = EXCLUDED.locale,
          timezone = EXCLUDED.timezone,
          notifications_enabled = EXCLUDED.notifications_enabled,
          invalidated_at = NULL,
          invalidation_reason = NULL,
          last_registered_at = NOW(),
          last_seen_at = NOW(),
          metadata = COALESCE(device_push_tokens.metadata, '{}'::jsonb) || EXCLUDED.metadata,
          updated_at = NOW()
    RETURNING id,
              tenant_id AS "tenantId",
              user_id AS "userId",
              staff_id AS "staffId",
              business_membership_id AS "businessMembershipId",
              vendor_membership_id AS "vendorMembershipId",
              provider,
              platform,
              device_id AS "deviceId",
              notifications_enabled AS "notificationsEnabled"
    `,
    [
      tenantId,
      userId,
      staffId,
      businessMembershipId,
      vendorMembershipId,
      provider,
      platform,
      pushToken,
      tokenHash,
      deviceId,
      appVersion,
      appBuild,
      locale,
      timezone,
      notificationsEnabled,
      JSON.stringify(metadata || {}),
    ]
  );

  return result.rows[0];
}

export async function unregisterPushToken(client, {
  tenantId,
  userId,
  tokenId = null,
  pushToken = null,
  reason = 'USER_REQUESTED',
}) {
  const tokenHash = pushToken ? hashPushToken(pushToken) : null;
  const result = await client.query(
    `
    UPDATE device_push_tokens
    SET notifications_enabled = FALSE,
        invalidated_at = NOW(),
        invalidation_reason = $4,
        updated_at = NOW()
    WHERE tenant_id = $1
      AND user_id = $2
      AND (
        ($3::uuid IS NOT NULL AND id = $3::uuid)
        OR
        ($5::text IS NOT NULL AND token_hash = $5::text)
      )
    RETURNING id,
              provider,
              platform,
              device_id AS "deviceId"
    `,
    [tenantId, userId, tokenId, reason, tokenHash]
  );

  return result.rows;
}

export async function resolveNotificationTargetTokens(client, notification) {
  const result = await client.query(
    `
    WITH recipient_users AS (
      SELECT $2::text AS user_id
      WHERE $2::text IS NOT NULL
      UNION
      SELECT bm.user_id
      FROM business_memberships bm
      WHERE $3::uuid IS NOT NULL
        AND bm.id = $3::uuid
      UNION
      SELECT s.user_id
      FROM staffs s
      WHERE $4::uuid IS NOT NULL
        AND s.id = $4::uuid
    )
    SELECT
      dpt.id,
      dpt.user_id AS "userId",
      dpt.staff_id AS "staffId",
      dpt.provider,
      dpt.platform,
      dpt.push_token AS "pushToken",
      dpt.device_id AS "deviceId",
      dpt.metadata
    FROM device_push_tokens dpt
    JOIN recipient_users ru ON ru.user_id = dpt.user_id
    WHERE dpt.tenant_id = $1
      AND dpt.notifications_enabled = TRUE
      AND dpt.invalidated_at IS NULL
    ORDER BY dpt.last_seen_at DESC, dpt.created_at DESC
    `,
    [
      notification.tenant_id,
      notification.recipient_user_id,
      notification.recipient_business_membership_id,
      notification.recipient_staff_id,
    ]
  );

  return result.rows;
}

export async function markPushTokenInvalid(client, tokenId, reason) {
  await client.query(
    `
    UPDATE device_push_tokens
    SET notifications_enabled = FALSE,
        invalidated_at = NOW(),
        invalidation_reason = $2,
        updated_at = NOW()
    WHERE id = $1
    `,
    [tokenId, reason]
  );
}

export async function touchPushTokenDelivery(client, tokenId) {
  await client.query(
    `
    UPDATE device_push_tokens
    SET last_delivery_at = NOW(),
        last_seen_at = NOW(),
        updated_at = NOW()
    WHERE id = $1
    `,
    [tokenId]
  );
}