// services/leaseService.ts
// Handle lease management, creation, updates, and tenant relationships

import { and, eq } from "drizzle-orm";
import { db } from "../db/db.ts";
import { leases, tenant_invites } from "../db/schema.ts";
import { Lease } from "../db/interfaces.ts";
import {
  getE2ELeaseById,
  getE2ELeasesByOwner,
  getE2ELeasesByTenant,
  isE2EEnabled,
  getE2EPendingApprovals,
  addE2ELeaseWithApproval,
} from "./e2eFixtures.ts";

// export interface Lease {
//   id: string;
//   title: string | null;
//   property_id: string;
//   property_address: string;
//   tenant_id: string | null;
//   owner_id: string;
//   start_date: number;
//   end_date: number;
//   rent: number | null;
//   security_deposit: number | null;
//   lease_status: string | null; // 'draft', 'active', 'expired', 'terminated'
//   lease_document_url: string | null;
//   payment_schedule_id: string | null;
//   late_fee_rules: string | null; // JSON string of late fee rules
//   auto_renewal: boolean | null;
//   encrypted_data: string | null;
//   created_on: number;
//   updated_on: number;
// }

// Create new lease
export async function createLease(
  title: string,
  property_id: string,
  owner_id: string,
  start_date: number,
  end_date: number,
  rent: number,
  security_deposit: number = 0,
  tenant_id?: string,
  payment_schedule_id?: string,
) {
  const now = Date.now();
  return await db.insert(leases)
    .values({
      id: crypto.randomUUID(),
      title,
      property_id,
      tenant_id: tenant_id || null,
      owner_id,
      start_date,
      end_date,
      rent,
      security_deposit,
      lease_status: "new",
      lease_document_url: null,
      payment_schedule_id: payment_schedule_id || null,
      late_fee_rules: null,
      auto_renewal: false,
      encrypted_data: null,
      created_on: now,
      updated_on: now,
    })
    .returning();
}

// Get leases by property
export async function getLeasesByProperty(property_id: string) {
  return await db.select()
    .from(leases)
    .where(eq(leases.property_id, property_id))
    .orderBy(leases.created_on);
}

// Get leases by owner (landlord)
export async function getLeasesByOwner(owner_id: string) {
  if (isE2EEnabled()) {
    return getE2ELeasesByOwner(owner_id);
  }
  return await db.select()
    .from(leases)
    .where(eq(leases.owner_id, owner_id))
    .orderBy(leases.created_on);
}

// Get leases by tenant
export async function getLeasesByTenant(tenant_id: string) {
  if (isE2EEnabled()) {
    return getE2ELeasesByTenant(tenant_id);
  }
  return await db.select()
    .from(leases)
    .where(eq(leases.tenant_id, tenant_id))
    .orderBy(leases.created_on);
}

// Get active leases by owner
export async function getActiveLeasesByOwner(owner_id: string) {
  return await db.select()
    .from(leases)
    .where(and(
      eq(leases.owner_id, owner_id),
      eq(leases.lease_status, "active"),
    ))
    .orderBy(leases.created_on);
}

// Get current lease for a property
export async function getCurrentLeaseForProperty(property_id: string) {
  const result = await db.select()
    .from(leases)
    .where(and(
      eq(leases.property_id, property_id),
      eq(leases.lease_status, "active"),
    ));
  return result[0] || null;
}

// Get lease by ID
export async function getLeaseById(id: string) {
  if (isE2EEnabled()) {
    return getE2ELeaseById(id);
  }
  const result = await db.select()
    .from(leases)
    .where(eq(leases.id, id));
  return result[0] || null;
}

// Update lease
export async function updateLease(
  id: string,
  updates: Partial<Omit<Lease, "id" | "created_on">>,
) {
  const now = Date.now();
  return await db.update(leases)
    .set({ ...updates, updated_on: now })
    .where(eq(leases.id, id))
    .returning();
}

// Assign tenant to lease
export async function assignTenantToLease(lease_id: string, tenant_id: string) {
  const now = Date.now();
  return await db.update(leases)
    .set({
      tenant_id,
      lease_status: "active",
      updated_on: now,
    })
    .where(eq(leases.id, lease_id))
    .returning();
}

// Update lease status
export async function updateLeaseStatus(
  id: string,
  status: "draft" | "active" | "expired" | "terminated",
) {
  const now = Date.now();
  return await db.update(leases)
    .set({
      lease_status: status,
      updated_on: now,
    })
    .where(eq(leases.id, id))
    .returning();
}

// Set lease document URL
export async function setLeaseDocument(lease_id: string, document_url: string) {
  const now = Date.now();
  return await db.update(leases)
    .set({
      lease_document_url: document_url,
      updated_on: now,
    })
    .where(eq(leases.id, lease_id))
    .returning();
}

// Set payment schedule
export async function setPaymentSchedule(
  lease_id: string,
  payment_schedule_id: string,
) {
  const now = Date.now();
  return await db.update(leases)
    .set({
      payment_schedule_id,
      updated_on: now,
    })
    .where(eq(leases.id, lease_id))
    .returning();
}

// Set late fee rules
export async function setLateFeeRules(
  lease_id: string,
  late_fee_rules: object,
) {
  const now = Date.now();
  return await db.update(leases)
    .set({
      late_fee_rules: JSON.stringify(late_fee_rules),
      updated_on: now,
    })
    .where(eq(leases.id, lease_id))
    .returning();
}

// Enable/disable auto renewal
export async function setAutoRenewal(lease_id: string, auto_renewal: boolean) {
  const now = Date.now();
  return await db.update(leases)
    .set({
      auto_renewal,
      updated_on: now,
    })
    .where(eq(leases.id, lease_id))
    .returning();
}

// Delete lease
export async function deleteLease(id: string) {
  return await db.delete(leases)
    .where(eq(leases.id, id))
    .returning();
}

// Sign a lease (mark it as signed by a user)
export async function signLease(lease_id: string, user_id: string) {
  const now = Date.now();
  return await db.update(leases)
    .set({
      lease_document_url: `signed_${lease_id}_${now}`,
      updated_on: now,
    })
    .where(eq(leases.id, lease_id))
    .returning();
}

// Get lease statistics for an owner
export async function getLeaseStatsByOwner(owner_id: string) {
  const allLeases = await getLeasesByOwner(owner_id);

  return {
    total: allLeases.length,
    draft: allLeases.filter((l) => l.lease_status === "draft").length,
    active: allLeases.filter((l) => l.lease_status === "active").length,
    expired: allLeases.filter((l) => l.lease_status === "expired").length,
    terminated: allLeases.filter((l) => l.lease_status === "terminated").length,
    with_tenant: allLeases.filter((l) => l.tenant_id !== null).length,
    without_tenant: allLeases.filter((l) => l.tenant_id === null).length,
  };
}

/**
 * Link a lease to a tenant invite. If an inviteId is provided, update that
 * tenant_invites row to reference this lease. Otherwise attempt to find an
 * existing invite by: lease's property and owner and attach lease_id
 * there; if none exists, create a new tenant_invites row linking to: lease.
 */
export async function inviteLease(lease_id: string, inviteId?: string) {
  // If an explicit inviteId was provided, update that invite record
  if (inviteId) {
    const now = Date.now();
    return await db.update(tenant_invites)
      .set({ lease_id, updated_on: now })
      .where(eq(tenant_invites.id, inviteId))
      .returning();
  }

  // Otherwise derive of property and landlord from lease
  const lease = await getLeaseById(lease_id);
  if (!lease) return null;

  const property_id = lease.property_id;
  const landlord_id = lease.owner_id;

  if (!property_id || !landlord_id) {
    return null;
  }

  const existing = await db.select().from(tenant_invites).where(
    and(
      eq(tenant_invites.property_id, property_id),
      eq(tenant_invites.landlord_id, landlord_id),
    ),
  );

  const now = Date.now();
  if (existing.length > 0) {
    return await db.update(tenant_invites)
      .set({ lease_id, updated_on: now })
      .where(eq(tenant_invites.id, existing[0].id))
      .returning();
  }

  // Create a new invite linking to this lease
  return await db.insert(tenant_invites).values({
    id: crypto.randomUUID(),
    landlord_id,
    property_id,
    lease_id,
    available_on: null,
    invited_emails: JSON.stringify([]),
    created_on: now,
    updated_on: now,
  }).returning();
}

// Request lease approval from tenant
export async function requestLeaseApproval(
  tenant_id: string,
  property_id: string,
  invite_id: string,
) {
  if (isE2EEnabled()) {
    return [addE2ELeaseWithApproval(tenant_id, property_id, invite_id)];
  }

  const now = Date.now();
  return await db.insert(leases)
    .values({
      id: crypto.randomUUID(),
      title: `Lease for Property ${property_id}`,
      property_id,
      tenant_id,
      owner_id: null,
      start_date: now,
      end_date: now + 365 * 24 * 60 * 60 * 1000,
      rent: null,
      security_deposit: null,
      lease_status: "draft",
      approval_status: "pending_approval",
      approval_requested_at: now,
      approved_at: null,
      approved_by: null,
      rejection_reason: null,
      lease_document_url: null,
      payment_schedule_id: null,
      late_fee_rules: null,
      auto_renewal: false,
      encrypted_data: null,
      created_on: now,
      updated_on: now,
    })
    .returning();
}

// Approve a lease request
export async function approveLease(
  lease_id: string,
  landlord_id: string,
) {
  if (isE2EEnabled()) {
    const lease = getE2ELeaseById(lease_id);
    if (lease && lease.owner_id === landlord_id) {
      const now = Date.now();
      return [{
        ...lease,
        approval_status: "approved",
        approved_at: now,
        approved_by: landlord_id,
        lease_status: "active",
        updated_on: now,
      }];
    }
    return [];
  }

  const now = Date.now();
  return await db.update(leases)
    .set({
      approval_status: "approved",
      approved_at: now,
      approved_by: landlord_id,
      lease_status: "active",
      updated_on: now,
    })
    .where(
      and(
        eq(leases.id, lease_id),
        eq(leases.owner_id, landlord_id),
      ),
    )
    .returning();
}

// Reject a lease request
export async function rejectLease(
  lease_id: string,
  landlord_id: string,
  rejection_reason?: string,
) {
  if (isE2EEnabled()) {
    const lease = getE2ELeaseById(lease_id);
    if (lease && lease.owner_id === landlord_id) {
      const now = Date.now();
      return [{
        ...lease,
        approval_status: "rejected",
        rejection_reason: rejection_reason || null,
        updated_on: now,
      }];
    }
    return [];
  }

  const now = Date.now();
  return await db.update(leases)
    .set({
      approval_status: "rejected",
      rejection_reason: rejection_reason || null,
      updated_on: now,
    })
    .where(
      and(
        eq(leases.id, lease_id),
        eq(leases.owner_id, landlord_id),
      ),
    )
    .returning();
}

// Get pending lease approvals for a landlord
export async function getPendingApprovals(landlord_id: string) {
  if (isE2EEnabled()) {
    return getE2EPendingApprovals(landlord_id);
  }

  return await db.select()
    .from(leases)
    .where(
      and(
        eq(leases.owner_id, landlord_id),
        eq(leases.approval_status, "pending_approval"),
      ),
    )
    .orderBy(leases.approval_requested_at);
}