import XCTest
@testable import VniDrop

/// Ports selected `shared/src/commonTest/.../ui/state` assertions to verify the
/// progress-derivation logic matches the Kotlin implementation.
final class ProgressDerivationTests: XCTestCase {

	func testFormatBytes() {
		XCTAssertEqual(formatBytes(0), "0 B")
		XCTAssertEqual(formatBytes(1023), "1023 B")
		XCTAssertEqual(formatBytes(1024), "1.0 KB")
		XCTAssertEqual(formatBytes(1536), "1.5 KB")
		XCTAssertEqual(formatBytes(1024 * 1024), "1.0 MB")
	}

	func testWindowClassThresholds() {
		XCTAssertEqual(windowClassFor(width: 320), .phone)
		XCTAssertEqual(windowClassFor(width: 599), .phone)
		XCTAssertEqual(windowClassFor(width: 600), .tablet)
		XCTAssertEqual(windowClassFor(width: 919), .tablet)
		XCTAssertEqual(windowClassFor(width: 920), .desktop)
	}

	func testParseProgressPrefersExported() {
		XCTAssertEqual(parseProgress("{\"exported\":50,\"file_size\":100}"), 0.5)
		XCTAssertEqual(parseProgress("{\"downloaded\":25,\"total_size\":100}"), 0.25)
		XCTAssertNil(parseProgress("{\"foo\":1}"))
		XCTAssertEqual(parseProgress("{\"offset\":200,\"size\":100}"), 1.0) // clamped
	}

	func testFindStringSkipsNull() {
		XCTAssertEqual(findString("{\"endpoint_id\":\"abc\"}", key: "endpoint_id"), "abc")
		XCTAssertNil(findString("{\"endpoint_id\":null}", key: "endpoint_id"))
		XCTAssertNil(findString("{\"endpoint_id\":123}", key: "endpoint_id"))
	}

	func testProgressForTransferUsesLatestNewestFirst() {
		let events = [
			event(phase: "import", kind: "copy-progress", json: "{\"exported\":30,\"file_size\":100}"),
			event(phase: "import", kind: "started", json: "{}"),
		]
		let progress = progressForTransfer(events: events, transferId: 1)
		XCTAssertEqual(progress?.labelKey, "progress_preparing")
		XCTAssertEqual(progress?.progress, 0.3)
	}

	func testStatusLabelKeys() {
		XCTAssertEqual(statusLabelKey(.sharing), "status_available")
		XCTAssertEqual(statusLabelKey(.receiving), "status_receiving")
		XCTAssertEqual(statusLabelKey(.done), "status_completed")
	}

	private func event(phase: String, kind: String, json: String) -> CoreEventModel {
		CoreEventModel(
			id: UUID().uuidString, timestamp: 0, scope: "transfer", transferId: 1,
			direction: "send", phase: phase, kind: kind, dataJson: json
		)
	}
}