import XCTest

final class TOCInteractionTests: XCTestCase {
    private let app = XCUIApplication()

    override func setUpWithError() throws {
        continueAfterFailure = false
    }

    func testTOCPanelShowsChapterList() throws {
        app.launchAndOpenSampleBook()
        app.waitForReader(timeout: 12)

        app.showReaderChromeIfNeeded()
        let tocButton = app.buttons[IDs.readerToc]
        XCTAssertTrue(tocButton.waitForExistence(timeout: 3), "目录按钮不存在")
        tocButton.tap()

        let tocTable = app.tables[IDs.readerTocTable]
        XCTAssertTrue(tocTable.waitForExistence(timeout: 5), "目录表格未出现")
        XCTAssertTrue(tocTable.cells.count > 0, "目录应至少有 1 个章节")
    }

    func testTOCNavigatesToChapter() throws {
        app.launchAndOpenSampleBook()
        app.waitForReader(timeout: 12)

        let initialState = app.waitForDemoReaderState(timeout: 5, description: "初始页码") { state in
            state.page != nil
        }
        let initialPage = initialState.page ?? 0

        app.showReaderChromeIfNeeded()
        app.buttons[IDs.readerToc].tap()

        let tocTable = app.tables[IDs.readerTocTable]
        XCTAssertTrue(tocTable.waitForExistence(timeout: 5), "目录表格未出现")

        if tocTable.cells.count > 1 {
            tocTable.cells.element(boundBy: 1).tap()

            let updatedState = app.waitForDemoReaderState(timeout: 8, description: "目录跳转后页码变化") { state in
                guard let page = state.page else { return false }
                return page != initialPage
            }
            let updatedPage = updatedState.page ?? 0
            XCTAssertNotEqual(updatedPage, initialPage, "目录跳转后页码应变化")
        } else {
            tocTable.cells.element(boundBy: 0).tap()
            app.waitForDemoReaderState(timeout: 8, description: "reader=opened") { $0.isOpened }
        }
    }

    func testTOCEmptyHandling() throws {
        app.launchAndOpenSampleBook()
        app.waitForReader(timeout: 12)

        app.showReaderChromeIfNeeded()
        app.buttons[IDs.readerToc].tap()

        XCTAssertTrue(app.otherElements[IDs.readerTocPanel].waitForExistence(timeout: 5), "目录面板应可打开")
    }
}