import {
  NotificationPlatform,
  NotificationStatus,
  ApprovalStatus,
  ActivityStatus,
  ContractStatus,
  ComplianceStatus,
  User,
  Invite,
  CreateNotificationRequest,
} from '../types';
import { apiClient } from './httpClient';
import {
  getCurrentUserSub,
  getCurrentUserClaims,
  getCurrentUserTenantId,
} from '../auth/AuthProvider';

export const CONSOLE_PORTAL_URL = 'https://console.ifri.khongisa.co.za/';
export const PARTNER_PORTAL_URL = 'https://partner.ifri.khongisa.co.za/';

export async function dispatchNotification(payload: CreateNotificationRequest): Promise<void> {
  const tenantId = getCurrentUserTenantId();
  const orgId =
    payload.organisationId !== undefined && payload.organisationId !== '' && payload.organisationId !== null
      ? Number(payload.organisationId)
      : (tenantId !== null ? tenantId : 1);

  await apiClient.post('/v1/api/communications/notifications', {
    organisationId: orgId,
    recipient: payload.recipient,
    platform: payload.platform,
    subject: payload.subject || null,
    destination: payload.destination || 'In-App User Inbox',
    message: payload.message,
    status: payload.status !== undefined ? payload.status : undefined,
  });
}

export async function fetchDirectoryUsers(page = 1, pageSize = 200): Promise<User[]> {
  try {
    const res = await apiClient.post<User[]>(`/v1/api/users/${page}/${pageSize}`, {});
    return res.data || [];
  } catch (err) {
    console.warn('[NotificationRules] Failed to fetch users directory:', err);
    return [];
  }
}

export function isApprovedOrActiveStatus(status: number | string | undefined | null): boolean {
  if (status === undefined || status === null) return false;

  const numStatus = Number(status);
  if (
    numStatus === ApprovalStatus.Approved ||
    numStatus === ActivityStatus.Active ||
    numStatus === ContractStatus.Active ||
    numStatus === ContractStatus.Executed ||
    numStatus === ComplianceStatus.Met ||
    numStatus === ComplianceStatus.Exceeded
  ) {
    return true;
  }

  const strStatus = String(status).toLowerCase().trim();
  return (
    strStatus === 'approved' ||
    strStatus === 'active' ||
    strStatus === 'executed' ||
    strStatus === 'met' ||
    strStatus === 'exceeded' ||
    strStatus === 'verified'
  );
}

export function getApprovedOrActiveStatusLabel(status: number | string | undefined | null): string {
  if (status === undefined || status === null) return 'Active';
  const numStatus = Number(status);
  if (numStatus === ApprovalStatus.Approved) return 'Approved';
  if (numStatus === ActivityStatus.Active) return 'Active';
  if (numStatus === ContractStatus.Active) return 'Active';
  if (numStatus === ComplianceStatus.Met) return 'Compliant (Met)';

  const str = String(status);
  return str.charAt(0).toUpperCase() + str.slice(1);
}

export async function getTenantManagersAndExecutives(): Promise<User[]> {
  try {
    const tenantId = getCurrentUserTenantId();
    const users = await fetchDirectoryUsers(1, 200);

    const managersAndExecutives = users.filter((u) => {
      const roleStr = String(u.role || '').toLowerCase();
      const isManagerOrExec =
        roleStr.includes('manager') ||
        roleStr.includes('executive') ||
        roleStr.includes('director') ||
        roleStr === '2' ||
        roleStr === '4';

      const matchesTenant =
        !tenantId || !u.tenant_id || Number(u.tenant_id) === Number(tenantId);

      return isManagerOrExec && matchesTenant;
    });

    if (managersAndExecutives.length > 0) {
      return managersAndExecutives;
    }

    const elevatedUsers = users.filter((u) => {
      const roleStr = String(u.role || '').toLowerCase();
      return (
        roleStr.includes('admin') ||
        roleStr.includes('supervisor') ||
        roleStr === '1' ||
        roleStr === '3'
      );
    });

    if (elevatedUsers.length > 0) {
      return elevatedUsers;
    }
  } catch (err) {
    console.warn('[NotificationRules] Directory lookup failed, using authenticated identity fallback:', err);
  }

  const currentSub = getCurrentUserSub();
  const currentClaims = getCurrentUserClaims();
  if (currentSub) {
    return [
      {
        id: currentSub,
        email: (currentClaims.email as string) || (currentClaims.preferred_username as string) || 'manager@pfm.org.za',
        status: ActivityStatus.Active,
        lastLoginAt: null,
        role: 'Manager',
        name: (currentClaims.name as string) || 'Tenant Manager',
      },
    ];
  }

  return [];
}

export interface RecordStatusChangeNotificationParams {
  recordType: string;
  recordId: string | number;
  newStatus: number | string;
  title?: string;
  previousStatus?: number | string;
}

export async function notifyTenantManagersAndExecutivesOnRecordStatusChange(
  params: RecordStatusChangeNotificationParams
): Promise<void> {
  const { recordType, recordId, newStatus, title } = params;

  if (recordType.toLowerCase() === 'user' || recordType.toLowerCase() === 'users') {
    return;
  }

  if (!isApprovedOrActiveStatus(newStatus)) {
    return;
  }

  const statusLabel = getApprovedOrActiveStatusLabel(newStatus);
  const orgId = getCurrentUserTenantId() || 1;
  const managersAndExecutives = await getTenantManagersAndExecutives();

  if (managersAndExecutives.length === 0) {
    return;
  }

  const recordDescriptor = title
    ? `${recordType} "${title}" (#${recordId})`
    : `${recordType} #${recordId}`;

  const inAppSubject = `[${statusLabel}] ${recordType} #${recordId} is now ${statusLabel}`;
  const inAppMessage = `### Statutory Record Update\n\nThe record **${recordDescriptor}** has officially transitioned to **${statusLabel}** status.\n\n- **Record Category:** ${recordType}\n- **Identifier:** #${recordId}\n- **Updated Status:** ${statusLabel}\n- **Timestamp:** ${new Date().toLocaleString()}`;

  const emailSubject = `[PFM Governance Alert] ${recordType} #${recordId} Status Transition: ${statusLabel}`;
  const emailMessage = `### Formal Statutory Notification\n\nThis is an automated notification to Tenant Managers and Executives regarding an approved record status update.\n\n**Record Details:**\n- **Category:** ${recordType}\n- **Reference Identifier:** #${recordId}\n${title ? `- **Title:** ${title}\n` : ''}- **New Lifecycle Status:** **${statusLabel}**\n- **Effective Timestamp:** ${new Date().toUTCString()}`;

  for (const recipient of managersAndExecutives) {
    if (!recipient.id) continue;
    const recipientEmail = recipient.email || 'manager@pfm.org.za';

    try {
      await dispatchNotification({
        organisationId: orgId,
        recipient: recipient.id,
        platform: NotificationPlatform.InApp,
        subject: inAppSubject,
        destination: recipientEmail,
        message: inAppMessage,
        status: NotificationStatus.Delivered,
      });
    } catch {}

    try {
      await dispatchNotification({
        organisationId: orgId,
        recipient: recipient.id,
        platform: NotificationPlatform.Email,
        subject: emailSubject,
        destination: `To: ${recipientEmail} | From: PFM Automated Governance System`,
        message: emailMessage,
        status: NotificationStatus.Queued,
      });
    } catch {}
  }
}

export interface InviteApprovedNotificationParams {
  invite: Partial<Invite> & {
    id: number | string;
    recipient: string;
    invitedOrganisationId?: number | string;
    organisationId?: number | string;
    awardId?: number | string;
    contractId?: number | string;
    message?: string;
  };
  partnerUser?: User | null;
  partnerEmail?: string;
}

export async function notifyInviteApproved(
  params: InviteApprovedNotificationParams
): Promise<void> {
  const { invite, partnerUser, partnerEmail } = params;
  if (!invite.recipient) return;

  const orgId = invite.invitedOrganisationId || invite.organisationId || getCurrentUserTenantId() || 1;
  const targetEmail = partnerEmail || partnerUser?.email || invite.recipient;

  try {
    await dispatchNotification({
      organisationId: orgId,
      recipient: invite.recipient,
      platform: NotificationPlatform.InApp,
      subject: 'Onboarding Invitation Approved: Access to Partner Portal Granted',
      destination: targetEmail,
      message: `Your statutory onboarding invitation has been formally Approved. Access the Partner Portal at ${PARTNER_PORTAL_URL}.`,
      status: NotificationStatus.Delivered,
    });
  } catch {}
}

export interface NewUserCreatedNotificationParams {
  userId: string;
  email: string;
  isPartner: boolean;
  roleName?: string;
  tenantId?: number | string | null;
}

export async function notifyNewUserCreated(
  params: NewUserCreatedNotificationParams
): Promise<void> {
  const { userId, email, isPartner, tenantId } = params;
  if (!userId || !email) return;

  const orgId = tenantId ? Number(tenantId) : (getCurrentUserTenantId() || 1);
  const targetUrl = isPartner ? PARTNER_PORTAL_URL : CONSOLE_PORTAL_URL;

  try {
    await dispatchNotification({
      organisationId: orgId,
      recipient: userId,
      platform: NotificationPlatform.InApp,
      subject: 'Welcome to PFM - Your Account Has Been Created',
      destination: email,
      message: `Your user account has been created. Please sign in at ${targetUrl}.`,
      status: NotificationStatus.Delivered,
    });
  } catch {}
}