import Fluent
import Vapor

// An intermediate layer between our api and view controllers that interacts with the
// database model.
struct EmployeeDB {

  func create(_ model: Employee.Create, on db: any Database) async throws -> Employee.DTO {
    let model = model.toModel()
    try await model.save(on: db)
    return model.toDTO()
  }

  func fetchAll(active: Bool? = nil, on db: any Database) async throws -> [Employee.DTO] {
    var query = Employee.query(on: db)
      .sort(\.$lastName)

    if let active {
      query = query.filter(\.$active == active)
    }

    return try await query.all().map { $0.toDTO() }
  }

  func get(id: Employee.IDValue, on db: any Database) async throws -> Employee.DTO? {
    try await Employee.find(id, on: db).map { $0.toDTO() }
  }

  func update(
    id: Employee.IDValue,
    with updates: Employee.Update,
    on db: any Database
  ) async throws -> Employee.DTO {
    guard let employee = try await Employee.find(id, on: db) else {
      throw Abort(.badRequest, reason: "Employee id not found.")
    }
    employee.applyUpdates(updates)
    try await employee.save(on: db)
    return employee.toDTO()
  }

  func delete(id: Employee.IDValue, on db: any Database) async throws {
    guard let employee = try await Employee.find(id, on: db) else {
      throw Abort(.badRequest, reason: "Employee id not found.")
    }
    try await employee.delete(on: db)
  }

}