import XCTest

/// 固定布局（pre-paginated）书籍的旋转回归：
/// 每次旋转会使预加载缓存签名失效并批量丢弃 WKWebView 页面，
/// 历史上曾因 script message handler 保留环导致 WebView 泄漏累积，
/// 多次旋转后在 CA commit 阶段 abort（CA::Render::Encoder::grow）。
final class FixedLayoutRotationTests: XCTestCase {
    private let app = XCUIApplication()

    override func setUpWithError() throws {
        continueAfterFailure = false
        XCUIDevice.shared.orientation = .portrait
    }

    override func tearDownWithError() throws {
        XCUIDevice.shared.orientation = .portrait
    }

    func testFixedLayoutBookSurvivesRepeatedRotation() {
        app.launchAndOpenSampleBook(bookTitleQuery: "熊爷爷")
        app.waitForReader()

        for _ in 0..<3 {
            XCUIDevice.shared.orientation = .landscapeLeft
            RunLoop.current.run(until: Date().addingTimeInterval(2))
            let landscapeState = app.waitForDemoReaderState(
                timeout: 5,
                description: "固定版式横屏保持单页"
            ) { $0.pagesPerScreen == 1 }
            XCTAssertEqual(landscapeState.pagesPerScreen, 1, "交互型固定版式书横屏不应启用双页")
            XCUIDevice.shared.orientation = .portrait
            RunLoop.current.run(until: Date().addingTimeInterval(2))
        }

        XCTAssertEqual(app.state, .runningForeground, "反复旋转后 app 已退出（疑似崩溃）")
        app.waitForReader()
    }

    func testFixedLayoutCachedPageCanReturnAfterPageTurn() {
        app.launchAndOpenSampleBook(bookTitleQuery: "熊爷爷")
        app.waitForReader()

        let content = app.otherElements[IDs.readerContent]
        XCTAssertTrue(content.waitForExistence(timeout: 5), "固定版式阅读区域未出现")
        let initialState = app.waitForDemoReaderState(timeout: 5, description: "固定版式初始页") {
            $0.page != nil
        }
        let initialPage = initialState.page ?? 0

        content.swipeLeft()
        let nextState = app.waitForDemoReaderState(timeout: 8, description: "固定版式向后翻页") { state in
            guard let page = state.page else { return false }
            return page != initialPage
        }

        content.swipeRight()
        let returnedState = app.waitForDemoReaderState(timeout: 8, description: "固定版式返回缓存页") {
            $0.page == initialPage
        }
        XCTAssertNotEqual(nextState.page, returnedState.page, "固定版式返回缓存页后页码未恢复")
        XCTAssertTrue(content.exists, "返回缓存页后阅读区域不应消失")
    }
}