import XCTest

/// **The automated half of 10-accessibility.md ▸ Verification**, whose first clause is the reason
/// this file is a set of tests and not a checklist:
///
/// > **Automated audits are test failures**: Xcode's accessibility audit (`performAccessibilityAudit`)
/// > runs in UI tests over every surface — board (trash shown and hidden), card window (Preview, Edit,
/// > raw source), welcome, template chooser, board popover.
///
/// Eight surfaces, eight tests, one audit call each. `performAccessibilityAudit` audits **the app's
/// currently displayed UI** rather than a subtree, so each test's job is entirely navigation: get the
/// surface on screen, then let the audit look at whatever is there.
///
/// ### No waiving
///
/// The audit's issue handler is where a false positive would be excused, and every test here passes
/// `nil` — no handler, nothing excused. That is the design's own posture ("violations are test
/// failures, not warnings"), and it is worth keeping literal: a handler that swallowed one issue type
/// app-wide would also swallow the next real one of that type, on a surface nobody was thinking about
/// when the waiver was written. Should a genuine platform false positive ever need excusing, it goes
/// in as a closure that matches **that one element on that one surface** and carries the reason in a
/// comment beside it — never a bare `return true`.
///
/// ### `.all`, not a narrowed set
///
/// `XCUIAccessibilityAuditType.all` is the default and stays the default. The narrower types
/// (`.contrast`, `.elementDetection`, `.hitRegion`, `.sufficientElementDescription`, `.textClipped`,
/// `.trait`) each map onto a rule 10-accessibility.md states — contrast is its ≥ 4.5:1 clause,
/// sufficient-description is its labels, trait is its selection and heading traits — so scoping any
/// of them out would be scoping out a design rule. They are named here only so a future narrowing has
/// to argue with this paragraph first.
///
/// ### The fixture board
///
/// Every test launches with `UITestLaunch.fixtureFlag`, which makes the app build a known board
/// inside its own container and open it (see `UITestLaunch` for why the board cannot simply be
/// handed over on the command line — the sandbox). The board is three lanes, six cards, one card
/// with a rich Markdown body and an attachment, and one card already in `.trash/`.
///
/// ### Running these
///
/// They drive the real app through the real menu bar, so the machine running them must have granted
/// the test runner Accessibility control (System Settings ▸ Privacy & Security ▸ Accessibility) and
/// must not be locked or headless. A run that cannot get automation permission fails on the first
/// `click()`, not on an accessibility defect — see `KanbanUITests/AccessibilityVerification.md`,
/// which puts this suite at the top of the manual pass for exactly that reason.
///
/// ### Reading a failure
///
/// The navigation waits are deliberately loud, and they are also the part most likely to need
/// adjusting: a window is identified by its **title** (`app.windows["…"]`, which is what
/// `navigationTitle` produces) and an on-board element by its **label**. Both are specified —
/// 11-command-nexus.md fixes the menu titles, `AccessibilityPhrases` fixes the labels — but neither
/// says which `XCUIElement.ElementType` SwiftUI will choose, and a hidden-title-bar window (welcome)
/// is the one place a title might not surface at all. So: a failure on `performAccessibilityAudit`
/// is an accessibility defect and is what this suite is for; a failure on a `waitForExistence` above
/// it is a navigation problem in *this file*, and the audit never ran.
final class AccessibilityAuditTests: XCTestCase {

    override func setUp() {
        super.setUp()
        // A failed navigation step makes every later step in that test meaningless — and an audit
        // that ran against the wrong surface would report a *pass*, which is worse than a failure.
        continueAfterFailure = false
    }

    // MARK: - The board window

    /// The board as it opens: lanes, cards, the toolbar, the search field — trash hidden, which is
    /// the board's default state (03-board-ui.md § Trash).
    @MainActor
    func testBoardWindowWithTrashHidden() throws {
        let app = XCUIApplication.launchedWithFixtureBoard()
        try app.performAccessibilityAudit()
    }

    /// The same board with View ▸ Show Trash on — "when shown, it is the last container, labeled as
    /// Trash with its count" (10-accessibility.md ▸ Trash lane), holding the fixture's one trashed
    /// card so the column's own card elements are audited and not just its header.
    @MainActor
    func testBoardWindowWithTrashShown() throws {
        let app = XCUIApplication.launchedWithFixtureBoard()
        app.clickMenuItem("Show Trash", in: "View")
        XCTAssertTrue(
            app.element(labeled: "Trash").waitForExistence(timeout: XCUIApplication.uiTimeout),
            "the trash column did not appear"
        )
        try app.performAccessibilityAudit()
    }

    // MARK: - The card window

    /// Preview mode — the card window's default. The fixture's rich card carries the structures 10
    /// makes claims about (headings, lists, a task list, a table, a code block, a link, an image with
    /// alt text), so this is the audit of "Preview renders to the accessibility tree as structured
    /// text" rather than of an empty body.
    @MainActor
    func testCardWindowPreviewMode() throws {
        let app = XCUIApplication.launchedWithFixtureBoard()
        try app.openRichCardWindow()
        try app.performAccessibilityAudit()
    }

    /// Edit mode — View ▸ Edit Body (⌘E), "an ordinary accessible text editor" (10 ▸ Card window).
    @MainActor
    func testCardWindowEditMode() throws {
        let app = XCUIApplication.launchedWithFixtureBoard()
        try app.openRichCardWindow()
        app.clickMenuItem("Edit Body", in: "View")
        try app.performAccessibilityAudit()
    }

    /// The raw-source outlet — View ▸ Raw Source (⌥⌘E), the whole `index.md` as text.
    ///
    /// Entered from Preview rather than from Edit, because the two are mutually exclusive by design
    /// ("Edit Body disables while Raw Source is active" — 05-card-window.md ▸ Raw source outlet) and
    /// stacking them would be auditing a state the app does not have.
    @MainActor
    func testCardWindowRawSourceMode() throws {
        let app = XCUIApplication.launchedWithFixtureBoard()
        try app.openRichCardWindow()
        app.clickMenuItem("Raw Source", in: "View")
        try app.performAccessibilityAudit()
    }

    // MARK: - Welcome, the template chooser, the board popover

    /// The welcome window, reached by its own Window-menu row — and reached *after* the fixture board
    /// has opened, so its recents list has a row in it. An empty welcome would audit the empty state
    /// and miss the rows 10 specifies ("⟨name⟩, ⟨location⟩, N lanes, M cards").
    @MainActor
    func testWelcomeWindow() throws {
        let app = XCUIApplication.launchedWithFixtureBoard()
        app.clickMenuItem("Welcome to Lanework", in: "Window")
        XCTAssertTrue(
            app.windows["Welcome to Lanework"].waitForExistence(timeout: XCUIApplication.uiTimeout),
            "the welcome window did not appear"
        )
        try app.performAccessibilityAudit()
    }

    /// The template chooser — File ▸ New Board… (⌥⌘N), the ten bundled templates as elements
    /// "labeled by title", their mini previews hidden (10 ▸ Template chooser).
    @MainActor
    func testTemplateChooser() throws {
        let app = XCUIApplication.launchedWithFixtureBoard()
        app.clickMenuItem("New Board…", in: "File")
        XCTAssertTrue(
            app.windows["New Board"].waitForExistence(timeout: XCUIApplication.uiTimeout),
            "the template chooser did not appear"
        )
        try app.performAccessibilityAudit()
    }

    /// The board popover — File ▸ Board Info (⌘I): "labeled controls throughout", with the git slot's
    /// information readable as text and never by colour or shape alone (10 ▸ Board popover).
    @MainActor
    func testBoardInfoPopover() throws {
        let app = XCUIApplication.launchedWithFixtureBoard()
        app.clickMenuItem("Board Info", in: "File")
        XCTAssertTrue(
            app.popovers.firstMatch.waitForExistence(timeout: XCUIApplication.uiTimeout),
            "the board popover did not appear"
        )
        try app.performAccessibilityAudit()
    }
}

// MARK: - Driving the app

extension XCUIApplication {

    /// One timeout for the whole suite. Generous, because a cold launch here also builds a board on
    /// disk, and because a UI test that is slow is not a UI test that is wrong.
    static let uiTimeout: TimeInterval = 30

    /// The first element anywhere in the app carrying `label`, whatever type it turned out to be.
    ///
    /// SwiftUI decides for itself which `XCUIElement.ElementType` a flattened accessibility element
    /// lands as — a card face and a lane container are both "one element" by design and neither is
    /// promised to be a `staticText` — so the waits in this file match on the label, which *is*
    /// specified (`AccessibilityPhrases`), rather than on a type that is not.
    @MainActor
    func element(labeled label: String) -> XCUIElement {
        descendants(matching: .any)
            .matching(NSPredicate(format: "label == %@", label))
            .firstMatch
    }

    /// Launches the app on the audit fixture board and waits for its window.
    ///
    /// The flag's spelling is `UITestLaunch.fixtureFlag` in the app target; it is written out here
    /// because a UI test bundle does not link the app it drives — the two ends of a launch argument
    /// are always a pair of literals, and this is the one place this end of the pair is spelled.
    @MainActor
    static func launchedWithFixtureBoard() -> XCUIApplication {
        let app = XCUIApplication()
        app.launchArguments += ["--ui-test-fixture-board"]
        app.launch()
        XCTAssertTrue(
            app.wait(for: .runningForeground, timeout: uiTimeout),
            "the app did not reach the foreground"
        )
        // `UITestLaunch.boardTitle`, which is also the window title (`BoardWindowHost.windowTitle`).
        // Waiting on *this* window rather than on `windows.firstMatch` is what makes a failed fixture
        // build a failure here instead of an audit that quietly passed over the welcome window.
        XCTAssertTrue(
            app.windows["Audit Board"].waitForExistence(timeout: uiTimeout),
            "the fixture board window did not open — check the app's launch log for a fixture build failure"
        )
        return app
    }

    /// Clicks a menu-bar row by its title.
    ///
    /// **By title, because the titles are API** (04-interactions.md ▸ Configurable bindings: menu
    /// items are remapped by title through `NSUserKeyEquivalents`, so the strings in
    /// `KanbanApp.menuCommands` are already a published contract). Driving the menus rather than
    /// typing the chords also means these tests exercise the same path a keyboard user takes, and a
    /// row that silently disabled itself fails here as an un-hittable element rather than as a
    /// keystroke that went nowhere.
    @MainActor
    func clickMenuItem(_ title: String, in menu: String) {
        let bar = menuBars.firstMatch
        let menuBarItem = bar.menuBarItems[menu]
        XCTAssertTrue(
            menuBarItem.waitForExistence(timeout: Self.uiTimeout),
            "the \(menu) menu is missing from the menu bar"
        )
        menuBarItem.click()

        let item = bar.menuItems[title]
        XCTAssertTrue(
            item.waitForExistence(timeout: Self.uiTimeout),
            "\(menu) ▸ \(title) is missing"
        )
        XCTAssertTrue(item.isEnabled, "\(menu) ▸ \(title) is disabled")
        item.click()
    }

    /// Selects the fixture's rich card and opens its window.
    ///
    /// **The selection is seeded with one arrow press**, which is the app's own documented rule:
    /// "an empty selection seeds at the first lane's first card" (04-interactions.md ▸ Grammar,
    /// `BoardView.seed`). From there the walk to the rich card is ordinary arrow navigation — the
    /// same keys a user without a pointer would press — so this helper needs to know no identifiers
    /// and no geometry, only the fixture's shape.
    ///
    /// The rich card is the sole card of lane 2 ("Doing"), so: one press to seed into lane 1's first
    /// card, then one `→` to step into lane 2. `→` steps to the nearest card in that direction, and
    /// with one card in the lane there is only one it can be.
    @MainActor
    func openRichCardWindow() throws {
        typeKey(.downArrow, modifierFlags: [])
        typeKey(.rightArrow, modifierFlags: [])
        clickMenuItem("Open Card", in: "Board")
        // `UITestLaunch.cardTitles[1][0]`, which is the card window's title
        // (`CardWindowHost.windowTitle`).
        XCTAssertTrue(
            windows["Write the smoke script"].waitForExistence(timeout: Self.uiTimeout),
            "the card window did not open"
        )
    }
}