// services/tenantApplicationService.ts
// Handle tenant applications, reviews, and approval workflow

import { and, eq } from "drizzle-orm";
import { db } from "../db/db.ts";
import { properties, tenant_applications } from "../db/schema.ts";

export interface TenantApplication {
  id: string;
  property_id?: string | null;
  applicant_id?: string | null;
  application_status?: string | null; // 'pending', 'approved', 'rejected'
  application_data_encrypted?: string | null; // Encrypted application details
  document_urls_json?: Record<string, unknown> | null;
  submitted_on?: number | null;
  reviewed_on?: number | null;
}

export interface ApplicationData {
  employment_info?: {
    employer: string;
    position: string;
    annual_income: number;
    employment_length: string;
  };
  references?: {
    previous_landlord?: string;
    previous_landlord_phone?: string;
    personal_reference?: string;
    personal_reference_phone?: string;
  };
  background_info?: {
    credit_score?: number;
    criminal_background?: boolean;
    eviction_history?: boolean;
    pets?: {
      has_pets: boolean;
      pet_details?: string;
    };
  };
  additional_info?: string;
}

// Extended interface for dashboard tenant applications with UI properties
export interface DashboardTenantApplication {
  id: string;
  property_id?: string | null;
  applicant_id?: string | null;
  application_status?: string | null;
  application_data_encrypted?: string | null;
  submitted_on?: number | null;
  reviewed_on?: number | null;
  applicant_name?: string;
  applicant_email?: string;
  property_address?: string;
  monthly_income?: number;
  application_notes?: string;
  status?: string; // UI-friendly status (maps to application_status)
  created_at?: number | null; // UI-friendly timestamp (maps to submitted_on)
  document_urls_json?: string | null; // UI-friendly string representation
}

// Create new tenant application
export async function createTenantApplication(
  property_id: string,
  applicant_id: string,
  application_data_encrypted: string,
  documentUrls: { url: string; name: string; type: string }[] | null = null,
) {
  const documentUrlsJson = documentUrls && documentUrls.length > 0
    ? JSON.stringify(documentUrls)
    : null;
  const now = Date.now();
  return await db.insert(tenant_applications)
    .values({
      id: crypto.randomUUID(),
      property_id,
      applicant_id,
      application_status: "pending",
      application_data_encrypted,
      document_urls_json: documentUrlsJson,
      submitted_on: now,
    })
    .returning();
}

// Get applications by property
export async function getApplicationsByProperty(property_id: string) {
  return await db.select()
    .from(tenant_applications)
    .where(eq(tenant_applications.property_id, property_id));
}

// Get applications by applicant
export async function getApplicationsByApplicant(applicant_id: string) {
  return await db.select()
    .from(tenant_applications)
    .where(eq(tenant_applications.applicant_id, applicant_id));
}

// Get specific application
export async function getApplicationById(id: string) {
  const result = await db.select()
    .from(tenant_applications)
    .where(eq(tenant_applications.id, id));
  return result[0] || null;
}

// Check if user has already applied for property
export async function hasUserAppliedForProperty(
  property_id: string,
  applicant_id: string,
) {
  const result = await db.select()
    .from(tenant_applications)
    .where(and(
      eq(tenant_applications.property_id, property_id),
      eq(tenant_applications.applicant_id, applicant_id),
    ));
  return result.length > 0;
}

// Update application status (approve/reject)
export async function updateApplicationStatus(
  id: string,
  status: "approved" | "rejected",
  reviewed_on?: number,
) {
  const now = reviewed_on || Date.now();
  return await db.update(tenant_applications)
    .set({
      application_status: status,
      reviewed_on: now,
    })
    .where(eq(tenant_applications.id, id))
    .returning();
}

// Get pending applications for landlord review
export async function getPendingApplications(property_ids: string[]) {
  if (property_ids.length === 0) return [];

  return await db.select()
    .from(tenant_applications)
    .where(and(
      eq(tenant_applications.application_status, "pending"),
      // Note: In a real implementation, you'd use an IN clause here
      // For now, we'll filter by the first property or implement proper IN logic
    ));
}

// Delete application (if needed)
export async function deleteApplication(id: string) {
  return await db.delete(tenant_applications)
    .where(eq(tenant_applications.id, id))
    .returning();
}

// Get application statistics for a property
export async function getApplicationStats(property_id: string) {
  const applications = await getApplicationsByProperty(property_id);

  return {
    total: applications.length,
    pending:
      applications.filter((app) => app.application_status === "pending").length,
    approved:
      applications.filter((app) => app.application_status === "approved")
        .length,
    rejected:
      applications.filter((app) => app.application_status === "rejected")
        .length,
  };
}

// Get tenant applications by landlord (via properties they own)
export async function getTenantApplicationsByLandlord(landlord_id: string) {
  return await db.select({
    id: tenant_applications.id,
    property_id: tenant_applications.property_id,
    applicant_id: tenant_applications.applicant_id,
    application_status: tenant_applications.application_status,
    application_data_encrypted: tenant_applications.application_data_encrypted,
    submitted_on: tenant_applications.submitted_on,
    reviewed_on: tenant_applications.reviewed_on,
  })
    .from(tenant_applications)
    .innerJoin(properties, eq(tenant_applications.property_id, properties.id))
    .where(eq(properties.owner_id, landlord_id))
    .orderBy(tenant_applications.submitted_on);
}

// Get tenant applications based on user role (tenant or landlord)
// This is the main function for data isolation - filters applications by user context
export async function getTenantApplicationsByUser(
  user_id: string,
  user_type: string,
) {
  if (user_type === "landlord") {
    // Landlords see applications for their properties
    return await getTenantApplicationsByLandlord(user_id);
  } else {
    // Tenants see only their own applications
    return await getApplicationsByApplicant(user_id);
  }
}

// Update tenant application status (alias for compatibility)
export async function updateTenantApplicationStatus(
  id: string,
  status: "approved" | "rejected",
  reviewed_on?: number,
) {
  return await updateApplicationStatus(id, status, reviewed_on);
}