import XCTest
@testable import PortfolioJournal

@MainActor
final class ChartsViewModelDisplayRulesTests: XCTestCase {
    func testAllocationTargetsSupportedOnlyForCategoryBreakdown() {
        XCTAssertTrue(ChartsViewModel.supportsAllocationTargets(for: .category))
        XCTAssertFalse(ChartsViewModel.supportsAllocationTargets(for: .source))
    }

    func testEvolutionTimeRangesIncludeRequestedOptions() {
        let viewModel = ChartsViewModel(iapService: IAPService())
        let ranges = viewModel.availableTimeRanges(for: .evolution)

        XCTAssertEqual(ranges, [.all, .yearToDate, .year, .quarter])
    }

    func testYearToDateRangeStartsAtBeginningOfYear() {
        let calendar = Calendar(identifier: .gregorian)
        let referenceDate = calendar.date(from: DateComponents(year: 2026, month: 8, day: 15))!
        let startDate = ChartsViewModel.TimeRange.yearToDate.startDate(referenceDate: referenceDate)
        let expected = calendar.date(from: DateComponents(year: 2026, month: 1, day: 1))!

        XCTAssertEqual(startDate, expected)
    }
}