import XCTest

@testable import MultiSimAdmin

final class TimestampTextTests: XCTestCase {
    private let calendar = Calendar(identifier: .gregorian)

    func testTodayOnlyShowsClockTime() {
        let output = TimestampText.short("2026-09-14 08:05:00", now: date(2026, 9, 14, 20, 0))
        XCTAssertEqual(output, "08:05")
    }

    func testSameYearShowsMonthAndTime() {
        let output = TimestampText.short("2026-03-02 08:05:00", now: date(2026, 9, 14, 20, 0))
        XCTAssertEqual(output, "03-02 08:05")
    }

    func testOtherYearFallsBackToDate() {
        let output = TimestampText.short("2025-12-31 23:59:00", now: date(2026, 9, 14, 20, 0))
        XCTAssertEqual(output, "2025-12-31")
    }

    func testParsesEpochMilliseconds() {
        XCTAssertEqual(TimestampText.date(from: "1767484800000"), Date(timeIntervalSince1970: 1_767_484_800))
    }

    func testParsesEpochSeconds() {
        XCTAssertEqual(TimestampText.date(from: "1767484800"), Date(timeIntervalSince1970: 1_767_484_800))
    }

    func testZuluTimestampIsReadAsUTC() {
        let iso = try? XCTUnwrap(TimestampText.date(from: "2026-01-04T00:00:00Z"))
        XCTAssertEqual(iso, Date(timeIntervalSince1970: 1_767_484_800))
    }

    func testUnparseableTextIsKeptAsIs() {
        XCTAssertEqual(TimestampText.short("  刚刚  "), "刚刚")
        XCTAssertEqual(TimestampText.short(""), "")
    }

    private func date(_ year: Int, _ month: Int, _ day: Int, _ hour: Int, _ minute: Int) -> Date {
        var components = DateComponents()
        components.year = year
        components.month = month
        components.day = day
        components.hour = hour
        components.minute = minute
        return calendar.date(from: components)!
    }
}