import XCTest
@testable import MusicBridge

final class LiveActivityTests: XCTestCase {
    @MainActor
    func testSnapshotUsesTrackRelativePosition() throws {
        let state = try fixture(position: 130, start: 100, end: 300)
        let content = LiveActivityManager.content(state, now: Date(timeIntervalSince1970: 1000))
        XCTAssertEqual(content.position, 30)
        XCTAssertEqual(content.duration, 200)
        XCTAssertEqual(content.progress, 0.15, accuracy: 0.001)
        XCTAssertEqual(content.updatedAt, Date(timeIntervalSince1970: 1000))
    }

    @MainActor
    func testOversizedUnicodeMetadataStaysBelowActivityKitBudget() throws {
        let malicious = String(repeating: "🎵\u{301}", count: 5000)
        let state = try fixture(title: malicious, artist: malicious)
        let content = LiveActivityManager.content(state)
        XCTAssertLessThanOrEqual(content.title.utf8.count, 256)
        XCTAssertLessThanOrEqual(content.artist.utf8.count, 256)
        let data = try JSONEncoder().encode(content)
        XCTAssertLessThan(data.count, 2048)
        XCTAssertEqual(try JSONDecoder().decode(MusicActivityAttributes.ContentState.self, from: data), content)
    }

    @MainActor
    func testUnknownDurationAndPausedState() throws {
        let state = try fixture(title: "", playback: "Paused", position: 42, start: 0, end: 0)
        let content = LiveActivityManager.content(state)
        XCTAssertEqual(content.title, "Без названия")
        XCTAssertFalse(content.playing)
        XCTAssertEqual(content.progress, 0)
        XCTAssertTrue(content.connected)
    }

    private func fixture(title: String = "Track", artist: String = "Artist", playback: String = "Playing",
                         position: Double = 42, start: Double = 0, end: Double = 200) throws -> MediaState {
        let url = Bundle(for: Self.self).url(forResource: "state-v1", withExtension: "json")!
        var json = try JSONSerialization.jsonObject(with: Data(contentsOf: url)) as! [String: Any]
        json["title"] = title; json["artist"] = artist; json["playbackStatus"] = playback
        json["positionSeconds"] = position; json["startSeconds"] = start; json["endSeconds"] = end
        return try JSONDecoder().decode(MediaState.self, from: JSONSerialization.data(withJSONObject: json))
    }
}