import { db } from "../db";
import type { Employee } from "../types";

export function findActiveEmployeeByEmail(email: string): Employee | undefined {
  return db
    .prepare<[string], Employee>(
      "SELECT * FROM employees WHERE email = ? AND active = 1"
    )
    .get(email.toLowerCase());
}

export function findEmployeeById(id: number): Employee | undefined {
  return db.prepare<[number], Employee>("SELECT * FROM employees WHERE id = ?").get(id);
}

export function listEmployees(): Employee[] {
  return db
    .prepare<[], Employee>("SELECT * FROM employees ORDER BY active DESC, email ASC")
    .all();
}

/** Fills in the display name the first time we see a Google profile for this employee. */
export function touchEmployeeName(id: number, name: string | null): void {
  if (!name) return;
  db.prepare("UPDATE employees SET name = ? WHERE id = ? AND name IS NULL").run(name, id);
}

export function addEmployee(email: string, name: string | null): Employee {
  const normalized = email.trim().toLowerCase();
  const existing = db
    .prepare<[string], Employee>("SELECT * FROM employees WHERE email = ?")
    .get(normalized);

  if (existing) {
    db.prepare("UPDATE employees SET active = 1, name = COALESCE(?, name) WHERE id = ?").run(
      name,
      existing.id
    );
    return findEmployeeById(existing.id)!;
  }

  const result = db
    .prepare("INSERT INTO employees (email, name) VALUES (?, ?)")
    .run(normalized, name);
  return findEmployeeById(Number(result.lastInsertRowid))!;
}

/** Soft delete: revokes login access but keeps attendance history for stats. */
export function deactivateEmployee(id: number): boolean {
  const result = db.prepare("UPDATE employees SET active = 0 WHERE id = ?").run(id);
  return result.changes > 0;
}