import DatabaseClient
import Dependencies
import SharedModels
import Vapor
import VaporElementary

struct UtilsViewController: RouteCollection {
  @Dependency(\.database) var database

  func boot(routes: any RoutesBuilder) throws {
    let route = routes.protected
    route.group("select") {
      $0.get("employee", use: employeeSelect(req:))
      $0.get("vendor-branches", use: vendorBranchSelect(req:))
    }
  }

  @Sendable
  func employeeSelect(req: Request) async throws -> HTMLResponse {
    let context = try req.query.decode(SelectQueryContext.self)
    let employees = try await database.employees.fetchAll()
    return await req.render { context.toHTML(employees: employees) }
  }

  @Sendable
  func vendorBranchSelect(req: Request) async throws -> HTMLResponse {
    let context = try req.query.decode(SelectQueryContext.self)
    let branches = try await database.vendorBranches.fetchAllWithDetail()
    return await req.render { context.toHTML(branches: branches) }
  }
}

private struct SelectQueryContext: Content {

  let context: SelectContext

  func toHTML(employees: [Employee]) -> EmployeeSelect {
    switch context {
    case .purchaseOrderForm:
      return .purchaseOrderForm(employees: employees)
    case .purchaseOrderSearch:
      return .purchaseOrderSearch(employees: employees)
    }
  }

  func toHTML(branches: [VendorBranch.Detail]) -> VendorBranchSelect {
    switch context {
    case .purchaseOrderForm:
      return .purchaseOrderForm(branches: branches)
    case .purchaseOrderSearch:
      return .purchaseOrderSearch(branches: branches)
    }
  }
}