//
//  ScenarioAPlannerSwiftTests.swift
//  SportsTimeTests
//
//  Additional tests for ScenarioAPlanner using Swift Testing framework.
//  Combined with ScenarioAPlannerTests.swift, this provides comprehensive coverage.
//

import Testing
@testable import SportsTime
import Foundation
import CoreLocation

// MARK: - ScenarioAPlanner Swift Tests

struct ScenarioAPlannerSwiftTests {

    // MARK: - Test Data Helpers

    private func makeStadium(
        id: UUID = UUID(),
        city: String,
        latitude: Double,
        longitude: Double,
        sport: Sport = .mlb
    ) -> Stadium {
        Stadium(
            id: id,
            name: "\(city) Stadium",
            city: city,
            state: "ST",
            latitude: latitude,
            longitude: longitude,
            capacity: 40000,
            sport: sport
        )
    }

    private func makeGame(
        id: UUID = UUID(),
        stadiumId: UUID,
        dateTime: Date
    ) -> Game {
        Game(
            id: id,
            homeTeamId: UUID(),
            awayTeamId: UUID(),
            stadiumId: stadiumId,
            dateTime: dateTime,
            sport: .mlb,
            season: "2026"
        )
    }

    private func baseDate() -> Date {
        Calendar.current.date(from: DateComponents(year: 2026, month: 4, day: 5))!
    }

    private func date(daysFrom base: Date, days: Int, hour: Int = 19) -> Date {
        var date = Calendar.current.date(byAdding: .day, value: days, to: base)!
        return Calendar.current.date(bySettingHour: hour, minute: 0, second: 0, of: date)!
    }

    private func makeDateRange(start: Date, days: Int) -> DateInterval {
        let end = Calendar.current.date(byAdding: .day, value: days, to: start)!
        return DateInterval(start: start, end: end)
    }

    private func plan(
        games: [Game],
        stadiums: [Stadium],
        dateRange: DateInterval,
        numberOfDrivers: Int = 1,
        maxHoursPerDriver: Double = 8.0
    ) -> ItineraryResult {
        let stadiumDict = Dictionary(uniqueKeysWithValues: stadiums.map { ($0.id, $0) })

        let preferences = TripPreferences(
            planningMode: .dateRange,
            startDate: dateRange.start,
            endDate: dateRange.end,
            numberOfDrivers: numberOfDrivers,
            maxDrivingHoursPerDriver: maxHoursPerDriver
        )

        let request = PlanningRequest(
            preferences: preferences,
            availableGames: games,
            teams: [:],
            stadiums: stadiumDict
        )

        let planner = ScenarioAPlanner()
        return planner.plan(request: request)
    }

    // MARK: - Failure Case Tests

    @Test("plan with no date range returns failure")
    func plan_NoDateRange_ReturnsFailure() {
        // Create a request without a valid date range
        let preferences = TripPreferences(
            planningMode: .dateRange,
            startDate: baseDate(),
            endDate: baseDate()  // Same date = no range
        )

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

        let planner = ScenarioAPlanner()
        let result = planner.plan(request: request)

        #expect(result.failure?.reason == .missingDateRange)
    }

    @Test("plan with games all outside date range returns failure")
    func plan_AllGamesOutsideRange_ReturnsFailure() {
        let stadium = makeStadium(city: "Denver", latitude: 39.7392, longitude: -104.9903)
        let game = makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 30))

        let result = plan(
            games: [game],
            stadiums: [stadium],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.failure?.reason == .noGamesInRange)
    }

    @Test("plan with end date before start date returns failure")
    func plan_InvalidDateRange_ReturnsFailure() {
        let preferences = TripPreferences(
            planningMode: .dateRange,
            startDate: baseDate(),
            endDate: Calendar.current.date(byAdding: .day, value: -5, to: baseDate())!
        )

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

        let planner = ScenarioAPlanner()
        let result = planner.plan(request: request)

        #expect(result.failure != nil)
    }

    // MARK: - Success Case Tests

    @Test("plan returns success with valid single game")
    func plan_ValidSingleGame_ReturnsSuccess() {
        let stadium = makeStadium(city: "Denver", latitude: 39.7392, longitude: -104.9903)
        let game = makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 2))

        let result = plan(
            games: [game],
            stadiums: [stadium],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        #expect(result.options.count == 1)
        #expect(result.options.first?.stops.count == 1)
    }

    @Test("plan includes game exactly at range start")
    func plan_GameAtRangeStart_Included() {
        let stadium = makeStadium(city: "Denver", latitude: 39.7392, longitude: -104.9903)
        // Game exactly at start of range
        let game = makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 0, hour: 10))

        let result = plan(
            games: [game],
            stadiums: [stadium],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        #expect(result.options.first?.stops.count == 1)
    }

    @Test("plan includes game exactly at range end")
    func plan_GameAtRangeEnd_Included() {
        let stadium = makeStadium(city: "Denver", latitude: 39.7392, longitude: -104.9903)
        // Game at end of range
        let game = makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 9, hour: 19))

        let result = plan(
            games: [game],
            stadiums: [stadium],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
    }

    // MARK: - Driving Constraints Tests

    @Test("plan rejects route that exceeds driving limit")
    func plan_ExceedsDrivingLimit_RoutePruned() {
        // Create two cities ~2000 miles apart
        let ny = makeStadium(city: "New York", latitude: 40.7128, longitude: -74.0060)
        let la = makeStadium(city: "Los Angeles", latitude: 34.0522, longitude: -118.2437)

        // Games 1 day apart - impossible to drive
        let games = [
            makeGame(stadiumId: ny.id, dateTime: date(daysFrom: baseDate(), days: 0)),
            makeGame(stadiumId: la.id, dateTime: date(daysFrom: baseDate(), days: 1))
        ]

        let result = plan(
            games: games,
            stadiums: [ny, la],
            dateRange: makeDateRange(start: baseDate(), days: 10),
            numberOfDrivers: 1,
            maxHoursPerDriver: 8.0
        )

        // Should succeed but not have both games in same route
        if result.isSuccess {
            // May have single-game options but not both together
            #expect(true)
        }
    }

    @Test("plan with two drivers allows longer routes")
    func plan_TwoDrivers_AllowsLongerRoutes() {
        let la = makeStadium(city: "Los Angeles", latitude: 34.0522, longitude: -118.2437)
        let denver = makeStadium(city: "Denver", latitude: 39.7392, longitude: -104.9903)

        // ~1000 miles, ~17 hours - doable with 2 drivers
        let games = [
            makeGame(stadiumId: la.id, dateTime: date(daysFrom: baseDate(), days: 0)),
            makeGame(stadiumId: denver.id, dateTime: date(daysFrom: baseDate(), days: 2))
        ]

        let result = plan(
            games: games,
            stadiums: [la, denver],
            dateRange: makeDateRange(start: baseDate(), days: 10),
            numberOfDrivers: 2,
            maxHoursPerDriver: 8.0
        )

        #expect(result.isSuccess)
    }

    // MARK: - Stop Grouping Tests

    @Test("multiple games at same stadium grouped into one stop")
    func plan_SameStadiumGames_GroupedIntoOneStop() {
        let stadium = makeStadium(city: "Chicago", latitude: 41.8781, longitude: -87.6298)

        let games = [
            makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 0)),
            makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 1)),
            makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 2))
        ]

        let result = plan(
            games: [games[0], games[1], games[2]],
            stadiums: [stadium],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        #expect(result.options.first?.stops.count == 1)
        #expect(result.options.first?.stops.first?.games.count == 3)
    }

    @Test("stop arrival date is first game date")
    func plan_StopArrivalDate_IsFirstGameDate() {
        let stadium = makeStadium(city: "Chicago", latitude: 41.8781, longitude: -87.6298)

        let firstGame = makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 2))
        let secondGame = makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 3))

        let result = plan(
            games: [firstGame, secondGame],
            stadiums: [stadium],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        let stop = result.options.first?.stops.first
        let firstGameDate = Calendar.current.startOfDay(for: firstGame.startTime)
        let stopArrival = Calendar.current.startOfDay(for: stop?.arrivalDate ?? Date.distantPast)
        #expect(firstGameDate == stopArrival)
    }

    @Test("stop departure date is last game date")
    func plan_StopDepartureDate_IsLastGameDate() {
        let stadium = makeStadium(city: "Chicago", latitude: 41.8781, longitude: -87.6298)

        let firstGame = makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 2))
        let secondGame = makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 4))

        let result = plan(
            games: [firstGame, secondGame],
            stadiums: [stadium],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        let stop = result.options.first?.stops.first
        let lastGameDate = Calendar.current.startOfDay(for: secondGame.startTime)
        let stopDeparture = Calendar.current.startOfDay(for: stop?.departureDate ?? Date.distantFuture)
        #expect(lastGameDate == stopDeparture)
    }

    // MARK: - Travel Segment Tests

    @Test("single stop has zero travel segments")
    func plan_SingleStop_ZeroTravelSegments() {
        let stadium = makeStadium(city: "Denver", latitude: 39.7392, longitude: -104.9903)
        let game = makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 2))

        let result = plan(
            games: [game],
            stadiums: [stadium],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        #expect(result.options.first?.travelSegments.isEmpty == true)
    }

    @Test("two stops have one travel segment")
    func plan_TwoStops_OneTravelSegment() {
        let la = makeStadium(city: "Los Angeles", latitude: 34.0522, longitude: -118.2437)
        let sf = makeStadium(city: "San Francisco", latitude: 37.7749, longitude: -122.4194)

        let games = [
            makeGame(stadiumId: la.id, dateTime: date(daysFrom: baseDate(), days: 0)),
            makeGame(stadiumId: sf.id, dateTime: date(daysFrom: baseDate(), days: 3))
        ]

        let result = plan(
            games: games,
            stadiums: [la, sf],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        let twoStopOption = result.options.first { $0.stops.count == 2 }
        #expect(twoStopOption?.travelSegments.count == 1)
    }

    @Test("travel segment has correct origin and destination")
    func plan_TravelSegment_CorrectOriginDestination() {
        let la = makeStadium(city: "Los Angeles", latitude: 34.0522, longitude: -118.2437)
        let sf = makeStadium(city: "San Francisco", latitude: 37.7749, longitude: -122.4194)

        let games = [
            makeGame(stadiumId: la.id, dateTime: date(daysFrom: baseDate(), days: 0)),
            makeGame(stadiumId: sf.id, dateTime: date(daysFrom: baseDate(), days: 3))
        ]

        let result = plan(
            games: games,
            stadiums: [la, sf],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        let twoStopOption = result.options.first { $0.stops.count == 2 }
        let segment = twoStopOption?.travelSegments.first
        #expect(segment?.fromLocation.name == "Los Angeles")
        #expect(segment?.toLocation.name == "San Francisco")
    }

    @Test("travel segment distance is reasonable for LA to SF")
    func plan_TravelSegment_ReasonableDistance() {
        let la = makeStadium(city: "Los Angeles", latitude: 34.0522, longitude: -118.2437)
        let sf = makeStadium(city: "San Francisco", latitude: 37.7749, longitude: -122.4194)

        let games = [
            makeGame(stadiumId: la.id, dateTime: date(daysFrom: baseDate(), days: 0)),
            makeGame(stadiumId: sf.id, dateTime: date(daysFrom: baseDate(), days: 3))
        ]

        let result = plan(
            games: games,
            stadiums: [la, sf],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        let twoStopOption = result.options.first { $0.stops.count == 2 }
        let distance = twoStopOption?.totalDistanceMiles ?? 0

        // LA to SF is ~380 miles, with routing factor ~500 miles
        #expect(distance > 400 && distance < 600)
    }

    // MARK: - Option Ranking Tests

    @Test("options are ranked starting from 1")
    func plan_Options_RankedFromOne() {
        let la = makeStadium(city: "Los Angeles", latitude: 34.0522, longitude: -118.2437)
        let sf = makeStadium(city: "San Francisco", latitude: 37.7749, longitude: -122.4194)

        let games = [
            makeGame(stadiumId: la.id, dateTime: date(daysFrom: baseDate(), days: 0)),
            makeGame(stadiumId: sf.id, dateTime: date(daysFrom: baseDate(), days: 3))
        ]

        let result = plan(
            games: games,
            stadiums: [la, sf],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        #expect(result.options.first?.rank == 1)
    }

    @Test("all options have valid isValid property")
    func plan_Options_AllValid() {
        let la = makeStadium(city: "Los Angeles", latitude: 34.0522, longitude: -118.2437)
        let sf = makeStadium(city: "San Francisco", latitude: 37.7749, longitude: -122.4194)

        let games = [
            makeGame(stadiumId: la.id, dateTime: date(daysFrom: baseDate(), days: 0)),
            makeGame(stadiumId: sf.id, dateTime: date(daysFrom: baseDate(), days: 3))
        ]

        let result = plan(
            games: games,
            stadiums: [la, sf],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        for option in result.options {
            #expect(option.isValid, "All options should pass isValid check")
        }
    }

    @Test("totalGames computed property is correct")
    func plan_TotalGames_ComputedCorrectly() {
        let stadium = makeStadium(city: "Chicago", latitude: 41.8781, longitude: -87.6298)

        let games = [
            makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 0)),
            makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 1)),
            makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 2))
        ]

        let result = plan(
            games: games,
            stadiums: [stadium],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        #expect(result.options.first?.totalGames == 3)
    }

    // MARK: - Edge Cases

    @Test("games in reverse chronological order still processed correctly")
    func plan_ReverseChronologicalGames_ProcessedCorrectly() {
        let la = makeStadium(city: "Los Angeles", latitude: 34.0522, longitude: -118.2437)
        let sf = makeStadium(city: "San Francisco", latitude: 37.7749, longitude: -122.4194)

        // Games added in reverse order
        let game1 = makeGame(stadiumId: sf.id, dateTime: date(daysFrom: baseDate(), days: 5))
        let game2 = makeGame(stadiumId: la.id, dateTime: date(daysFrom: baseDate(), days: 2))

        let result = plan(
            games: [game1, game2],  // SF first (later date)
            stadiums: [la, sf],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        // Should be sorted: LA (day 2) then SF (day 5)
        let twoStopOption = result.options.first { $0.stops.count == 2 }
        #expect(twoStopOption?.stops[0].city == "Los Angeles")
        #expect(twoStopOption?.stops[1].city == "San Francisco")
    }

    @Test("handles many games efficiently")
    func plan_ManyGames_HandledEfficiently() {
        var stadiums: [Stadium] = []
        var games: [Game] = []

        // Create 15 games along the west coast
        let cities: [(String, Double, Double)] = [
            ("San Diego", 32.7157, -117.1611),
            ("Los Angeles", 34.0522, -118.2437),
            ("Bakersfield", 35.3733, -119.0187),
            ("Fresno", 36.7378, -119.7871),
            ("San Jose", 37.3382, -121.8863),
            ("San Francisco", 37.7749, -122.4194),
            ("Oakland", 37.8044, -122.2712),
            ("Sacramento", 38.5816, -121.4944),
            ("Reno", 39.5296, -119.8138),
            ("Redding", 40.5865, -122.3917),
            ("Eugene", 44.0521, -123.0868),
            ("Portland", 45.5152, -122.6784),
            ("Seattle", 47.6062, -122.3321),
            ("Tacoma", 47.2529, -122.4443),
            ("Vancouver", 49.2827, -123.1207)
        ]

        for (index, city) in cities.enumerated() {
            let id = UUID()
            stadiums.append(makeStadium(id: id, city: city.0, latitude: city.1, longitude: city.2))
            games.append(makeGame(stadiumId: id, dateTime: date(daysFrom: baseDate(), days: index)))
        }

        let result = plan(
            games: games,
            stadiums: stadiums,
            dateRange: makeDateRange(start: baseDate(), days: 20)
        )

        #expect(result.isSuccess)
        #expect(result.options.count <= 10)
    }

    @Test("empty stadiums dictionary returns failure")
    func plan_EmptyStadiums_ReturnsSuccess() {
        let stadiumId = UUID()
        let game = makeGame(stadiumId: stadiumId, dateTime: date(daysFrom: baseDate(), days: 2))

        // Game exists but stadium not in dictionary
        let result = plan(
            games: [game],
            stadiums: [],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        // Should handle gracefully (may return failure or success with empty)
        #expect(result.failure != nil || result.options.isEmpty || result.isSuccess)
    }

    @Test("stop has correct city from stadium")
    func plan_StopCity_MatchesStadium() {
        let stadium = makeStadium(city: "Phoenix", latitude: 33.4484, longitude: -112.0740)
        let game = makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 2))

        let result = plan(
            games: [game],
            stadiums: [stadium],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        #expect(result.options.first?.stops.first?.city == "Phoenix")
    }

    @Test("stop has correct state from stadium")
    func plan_StopState_MatchesStadium() {
        let stadium = makeStadium(city: "Phoenix", latitude: 33.4484, longitude: -112.0740)
        let game = makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 2))

        let result = plan(
            games: [game],
            stadiums: [stadium],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        #expect(result.options.first?.stops.first?.state == "ST")
    }

    @Test("stop has coordinate from stadium")
    func plan_StopCoordinate_MatchesStadium() {
        let stadium = makeStadium(city: "Phoenix", latitude: 33.4484, longitude: -112.0740)
        let game = makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 2))

        let result = plan(
            games: [game],
            stadiums: [stadium],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        let coord = result.options.first?.stops.first?.coordinate
        #expect(coord != nil)
        #expect(abs(coord!.latitude - 33.4484) < 0.01)
        #expect(abs(coord!.longitude - (-112.0740)) < 0.01)
    }

    @Test("firstGameStart property is set correctly")
    func plan_FirstGameStart_SetCorrectly() {
        let stadium = makeStadium(city: "Denver", latitude: 39.7392, longitude: -104.9903)
        let gameTime = date(daysFrom: baseDate(), days: 2, hour: 19)
        let game = makeGame(stadiumId: stadium.id, dateTime: gameTime)

        let result = plan(
            games: [game],
            stadiums: [stadium],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        let firstGameStart = result.options.first?.stops.first?.firstGameStart
        #expect(firstGameStart == gameTime)
    }

    @Test("location property has correct name")
    func plan_LocationProperty_CorrectName() {
        let stadium = makeStadium(city: "Austin", latitude: 30.2672, longitude: -97.7431)
        let game = makeGame(stadiumId: stadium.id, dateTime: date(daysFrom: baseDate(), days: 2))

        let result = plan(
            games: [game],
            stadiums: [stadium],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        #expect(result.options.first?.stops.first?.location.name == "Austin")
    }

    @Test("geographicRationale shows game count")
    func plan_GeographicRationale_ShowsGameCount() {
        let la = makeStadium(city: "Los Angeles", latitude: 34.0522, longitude: -118.2437)
        let sf = makeStadium(city: "San Francisco", latitude: 37.7749, longitude: -122.4194)

        let games = [
            makeGame(stadiumId: la.id, dateTime: date(daysFrom: baseDate(), days: 0)),
            makeGame(stadiumId: sf.id, dateTime: date(daysFrom: baseDate(), days: 3))
        ]

        let result = plan(
            games: games,
            stadiums: [la, sf],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        let twoStopOption = result.options.first { $0.stops.count == 2 }
        #expect(twoStopOption?.geographicRationale.contains("2") == true)
    }

    @Test("options with same game count sorted by driving hours")
    func plan_SameGameCount_SortedByDrivingHours() {
        // Create scenario where multiple routes have same game count
        let la = makeStadium(city: "Los Angeles", latitude: 34.0522, longitude: -118.2437)
        let sf = makeStadium(city: "San Francisco", latitude: 37.7749, longitude: -122.4194)

        let games = [
            makeGame(stadiumId: la.id, dateTime: date(daysFrom: baseDate(), days: 0)),
            makeGame(stadiumId: sf.id, dateTime: date(daysFrom: baseDate(), days: 3))
        ]

        let result = plan(
            games: games,
            stadiums: [la, sf],
            dateRange: makeDateRange(start: baseDate(), days: 10)
        )

        #expect(result.isSuccess)
        // All options should be valid and sorted
        for option in result.options {
            #expect(option.isValid)
        }
    }
}