//
//  TripPlanningEngine.swift
//  SportsTime
//
//  Thin orchestrator that delegates to scenario-specific planners.
//

import Foundation

/// Main entry point for trip planning.
/// Delegates to scenario-specific planners via the ScenarioPlanner protocol.
final class TripPlanningEngine {

    /// Plans itineraries based on the request inputs.
    /// Automatically detects which scenario applies and delegates to the appropriate planner.
    ///
    /// - Parameter request: The planning request containing all inputs
    /// - Returns: Ranked itineraries on success, or explicit failure with reason
    func planItineraries(request: PlanningRequest) -> ItineraryResult {

        // Detect scenario and get the appropriate planner
        let scenario = ScenarioPlannerFactory.classify(request)
        let planner = ScenarioPlannerFactory.planner(for: request)

        print("[TripPlanningEngine] Detected scenario: \(scenario)")
        print("[TripPlanningEngine] Using planner: \(type(of: planner))")

        // Delegate to the scenario planner
        let result = planner.plan(request: request)

        // Log result
        switch result {
        case .success(let options):
            print("[TripPlanningEngine] Success: \(options.count) itinerary options")
        case .failure(let failure):
            print("[TripPlanningEngine] Failure: \(failure.reason)")
        }

        return result
    }
}