//
//  MustStopValidationTests.swift
//  SportsTimeTests
//
//  Tests for must-stop location filtering across all scenario planners.
//

import Testing
import CoreLocation
@testable import SportsTime

@Suite("Must-Stop Validation")
struct MustStopValidationTests {

    // MARK: - Centralized Must-Stop Filter (TripPlanningEngine)

    @Test("scenarioA: must stops filter routes to include required cities")
    func scenarioA_mustStops_routesContainRequiredCities() {
        let baseDate = TestFixtures.date(year: 2026, month: 6, day: 1, hour: 19, minute: 0)
        let day2 = TestClock.calendar.date(byAdding: .day, value: 1, to: baseDate)!
        let day3 = TestClock.calendar.date(byAdding: .day, value: 2, to: baseDate)!

        let gameNYC = TestFixtures.game(city: "New York", dateTime: baseDate)
        let gameBOS = TestFixtures.game(city: "Boston", dateTime: day2)
        let gamePHL = TestFixtures.game(city: "Philadelphia", dateTime: day3)

        let stadiums = TestFixtures.stadiumMap(for: [gameNYC, gameBOS, gamePHL])

        let prefs = TripPreferences(
            planningMode: .dateRange,
            sports: [.mlb],
            startDate: baseDate,
            endDate: day3,
            mustStopLocations: [LocationInput(name: "Boston")]
        )

        let request = PlanningRequest(
            preferences: prefs,
            availableGames: [gameNYC, gameBOS, gamePHL],
            teams: [:],
            stadiums: stadiums
        )

        let engine = TripPlanningEngine()
        let result = engine.planItineraries(request: request)

        if case .success(let options) = result {
            for option in options {
                let cities = option.stops.map { $0.city.lowercased() }
                #expect(cities.contains("boston"), "Every route must include Boston as a must-stop")
            }
        }
    }

    @Test("must stop impossible city returns failure")
    func mustStops_impossibleCity_returnsFailure() {
        let baseDate = TestFixtures.date(year: 2026, month: 6, day: 1, hour: 19, minute: 0)
        let day2 = TestClock.calendar.date(byAdding: .day, value: 1, to: baseDate)!

        let gameNYC = TestFixtures.game(city: "New York", dateTime: baseDate)
        let gameBOS = TestFixtures.game(city: "Boston", dateTime: day2)

        let stadiums = TestFixtures.stadiumMap(for: [gameNYC, gameBOS])

        // Require a city with no games
        let prefs = TripPreferences(
            planningMode: .dateRange,
            sports: [.mlb],
            startDate: baseDate,
            endDate: day2,
            mustStopLocations: [LocationInput(name: "Denver")]
        )

        let request = PlanningRequest(
            preferences: prefs,
            availableGames: [gameNYC, gameBOS],
            teams: [:],
            stadiums: stadiums
        )

        let engine = TripPlanningEngine()
        let result = engine.planItineraries(request: request)

        // Should fail because no route can include Denver
        #expect(!result.isSuccess)
    }

    @Test("scenarioB: must stops enforced via centralized filter")
    func scenarioB_mustStops_routesContainRequiredCities() {
        let baseDate = TestFixtures.date(year: 2026, month: 6, day: 1, hour: 19, minute: 0)
        let day2 = TestClock.calendar.date(byAdding: .day, value: 1, to: baseDate)!
        let day3 = TestClock.calendar.date(byAdding: .day, value: 2, to: baseDate)!

        let gameNYC = TestFixtures.game(id: "must_see_1", city: "New York", dateTime: baseDate)
        let gameBOS = TestFixtures.game(city: "Boston", dateTime: day2)
        let gamePHL = TestFixtures.game(city: "Philadelphia", dateTime: day3)

        let stadiums = TestFixtures.stadiumMap(for: [gameNYC, gameBOS, gamePHL])

        let prefs = TripPreferences(
            planningMode: .gameFirst,
            sports: [.mlb],
            mustSeeGameIds: [gameNYC.id],
            startDate: baseDate,
            endDate: day3,
            mustStopLocations: [LocationInput(name: "Boston")]
        )

        let request = PlanningRequest(
            preferences: prefs,
            availableGames: [gameNYC, gameBOS, gamePHL],
            teams: [:],
            stadiums: stadiums
        )

        let engine = TripPlanningEngine()
        let result = engine.planItineraries(request: request)

        if case .success(let options) = result {
            for option in options {
                let cities = option.stops.map { $0.city.lowercased() }
                #expect(cities.contains("boston"), "Must-stop filter should ensure Boston is included")
            }
        }
    }

    @Test("scenarioD: must stops enforced via centralized filter")
    func scenarioD_mustStops_routesContainRequiredCities() {
        let baseDate = TestFixtures.date(year: 2026, month: 6, day: 1, hour: 19, minute: 0)
        let day2 = TestClock.calendar.date(byAdding: .day, value: 1, to: baseDate)!
        let day3 = TestClock.calendar.date(byAdding: .day, value: 2, to: baseDate)!

        let teamId = "team_mlb_new_york"
        let gameNYC = TestFixtures.game(city: "New York", dateTime: baseDate, homeTeamId: teamId)
        let gameBOS = TestFixtures.game(city: "Boston", dateTime: day2, homeTeamId: "team_mlb_boston", awayTeamId: teamId)
        let gamePHL = TestFixtures.game(city: "Philadelphia", dateTime: day3, homeTeamId: "team_mlb_philadelphia", awayTeamId: teamId)

        let stadiums = TestFixtures.stadiumMap(for: [gameNYC, gameBOS, gamePHL])

        let prefs = TripPreferences(
            planningMode: .followTeam,
            sports: [.mlb],
            startDate: baseDate,
            endDate: day3,
            mustStopLocations: [LocationInput(name: "Boston")],
            followTeamId: teamId
        )

        let request = PlanningRequest(
            preferences: prefs,
            availableGames: [gameNYC, gameBOS, gamePHL],
            teams: [teamId: TestFixtures.team(city: "New York")],
            stadiums: stadiums
        )

        let engine = TripPlanningEngine()
        let result = engine.planItineraries(request: request)

        if case .success(let options) = result {
            for option in options {
                let cities = option.stops.map { $0.city.lowercased() }
                #expect(cities.contains("boston"), "Must-stop filter should ensure Boston is included in follow-team mode")
            }
        }
    }

    @Test("scenarioE: must stops enforced via centralized filter")
    func scenarioE_mustStops_routesContainRequiredCities() {
        let baseDate = TestFixtures.date(year: 2026, month: 6, day: 1, hour: 19, minute: 0)
        let day1 = TestClock.calendar.date(byAdding: .day, value: 1, to: baseDate)!
        let day2 = TestClock.calendar.date(byAdding: .day, value: 2, to: baseDate)!

        let teamNYC = "team_mlb_new_york"
        let teamBOS = "team_mlb_boston"

        let gameNYC = TestFixtures.game(city: "New York", dateTime: baseDate, homeTeamId: teamNYC)
        let gameBOS = TestFixtures.game(city: "Boston", dateTime: day1, homeTeamId: teamBOS)
        let gamePHL = TestFixtures.game(city: "Philadelphia", dateTime: day2, homeTeamId: "team_mlb_philadelphia")

        let stadiums = TestFixtures.stadiumMap(for: [gameNYC, gameBOS, gamePHL])

        let prefs = TripPreferences(
            planningMode: .teamFirst,
            sports: [.mlb],
            startDate: baseDate,
            endDate: day2,
            mustStopLocations: [LocationInput(name: "Boston")],
            selectedTeamIds: [teamNYC, teamBOS]
        )

        let request = PlanningRequest(
            preferences: prefs,
            availableGames: [gameNYC, gameBOS, gamePHL],
            teams: [
                teamNYC: TestFixtures.team(city: "New York"),
                teamBOS: TestFixtures.team(city: "Boston"),
            ],
            stadiums: stadiums
        )

        let engine = TripPlanningEngine()
        let result = engine.planItineraries(request: request)

        if case .success(let options) = result {
            for option in options {
                let cities = option.stops.map { $0.city.lowercased() }
                #expect(cities.contains("boston"), "Must-stop filter should ensure Boston is included in team-first mode")
            }
        }
    }

    @Test("scenarioC: must stops enforced via centralized filter")
    func scenarioC_mustStops_routesContainRequiredCities() {
        let baseDate = TestFixtures.date(year: 2026, month: 6, day: 1, hour: 19, minute: 0)
        let day2 = TestClock.calendar.date(byAdding: .day, value: 1, to: baseDate)!
        let day3 = TestClock.calendar.date(byAdding: .day, value: 2, to: baseDate)!

        let nycCoord = TestFixtures.coordinates["New York"]!
        let bosCoord = TestFixtures.coordinates["Boston"]!

        let gameNYC = TestFixtures.game(city: "New York", dateTime: baseDate)
        let gamePHL = TestFixtures.game(city: "Philadelphia", dateTime: day2)
        let gameBOS = TestFixtures.game(city: "Boston", dateTime: day3)

        let stadiums = TestFixtures.stadiumMap(for: [gameNYC, gamePHL, gameBOS])

        let prefs = TripPreferences(
            planningMode: .locations,
            startLocation: LocationInput(name: "New York", coordinate: nycCoord),
            endLocation: LocationInput(name: "Boston", coordinate: bosCoord),
            sports: [.mlb],
            startDate: baseDate,
            endDate: day3,
            mustStopLocations: [LocationInput(name: "Philadelphia")]
        )

        let request = PlanningRequest(
            preferences: prefs,
            availableGames: [gameNYC, gamePHL, gameBOS],
            teams: [:],
            stadiums: stadiums
        )

        let engine = TripPlanningEngine()
        let result = engine.planItineraries(request: request)

        if case .success(let options) = result {
            for option in options {
                let cities = option.stops.map { $0.city.lowercased() }
                #expect(cities.contains("philadelphia"), "Must-stop filter should ensure Philadelphia is included in route mode")
            }
        }
    }
}