import Foundation
import Testing
@testable import Kanban

/// The launch decision and the audit suite's fixture board (10-accessibility.md ▸ Verification).
///
/// Two halves, tested for two different reasons. `LaunchPlan.decide` and the flag predicate are
/// **pure**, so they are pinned here the way every other launch-time rule in this app is — without a
/// `UserDefaults` domain, a live registry, or a running app (`AppModel.shouldRestoreAtLaunch`'s own
/// argument, which this composes).
///
/// The fixture board is tested here for a blunter reason: **the UI suite that consumes it cannot be
/// run in every environment** (it needs Accessibility automation permission and an unlocked
/// display), and a fixture that quietly failed to build would turn every audit into a pass over an
/// empty screen. Loading it back through the ordinary `BoardLoader` is the one check that runs
/// everywhere and would catch that.

// MARK: - The launch plan

@Suite("The launch plan")
struct LaunchPlanTests {

    /// The three-way decision, exhaustively — the two-way gate `AppModel.shouldRestoreAtLaunch`
    /// already owns, plus the fixture's outright precedence over both halves of it.
    ///
    /// The precedence matters more than it looks: a UI-test launch that also restored the
    /// developer's flagged boards would open real documents, run real watchers over them, and stamp
    /// real registry records — during a test run whose whole premise is that nothing outside the
    /// scratch directory is touched.
    @Test(
        "The fixture wins outright; otherwise the restore gate decides",
        arguments: [
            (fixture: true, preference: true, restorables: true, expected: LaunchPlan.uiTestFixture),
            (fixture: true, preference: false, restorables: false, expected: LaunchPlan.uiTestFixture),
            (fixture: false, preference: true, restorables: true, expected: LaunchPlan.restoreBoards),
            (fixture: false, preference: true, restorables: false, expected: LaunchPlan.welcome),
            (fixture: false, preference: false, restorables: true, expected: LaunchPlan.welcome),
            (fixture: false, preference: false, restorables: false, expected: LaunchPlan.welcome),
        ]
    )
    func decision(fixture: Bool, preference: Bool, restorables: Bool, expected: LaunchPlan) {
        #expect(
            LaunchPlan.decide(
                isUITestFixtureLaunch: fixture,
                restorePreference: preference,
                hasRestorables: restorables
            ) == expected
        )
    }

    /// Which plans need the throwaway bootstrap window: both the ones that open something, neither
    /// more. Welcome is a scene the app presents directly and needs no view to run a pass for it.
    @Test("Only the two opening plans present the bootstrap window")
    func bootstrapPresentation() {
        #expect(LaunchPlan.welcome.presentsBootstrap == false)
        #expect(LaunchPlan.restoreBoards.presentsBootstrap)
        #expect(LaunchPlan.uiTestFixture.presentsBootstrap)
    }
}

// MARK: - The flag

@Suite("The UI-test fixture flag")
struct UITestLaunchFlagTests {

    @Test("An exact occurrence anywhere in the argument list asks for the fixture")
    func flagRecognized() {
        #expect(UITestLaunch.isFixtureLaunch(arguments: ["/path/to/Lanework", UITestLaunch.fixtureFlag]))
        #expect(UITestLaunch.isFixtureLaunch(arguments: [UITestLaunch.fixtureFlag, "-NSTreatUnknownArgumentsAsOpen", "NO"]))
    }

    /// An ordinary launch — including the one XCUITest performs with no arguments of its own — is
    /// never a fixture launch.
    @Test("An absent flag is an ordinary launch")
    func flagAbsent() {
        #expect(UITestLaunch.isFixtureLaunch(arguments: []) == false)
        #expect(UITestLaunch.isFixtureLaunch(arguments: ["/path/to/Lanework"]) == false)
    }

    /// **Exact match, not a prefix.** A launch switch with a fuzzy edge is a launch switch that can
    /// be tripped by accident, and this one redirects the registry — the one place an accident would
    /// look like the user's recents list having been wiped.
    @Test("A near-miss is not the flag")
    func flagNotMatchedLoosely() {
        #expect(UITestLaunch.isFixtureLaunch(arguments: ["\(UITestLaunch.fixtureFlag)s"]) == false)
        #expect(UITestLaunch.isFixtureLaunch(arguments: ["\(UITestLaunch.fixtureFlag)=basic"]) == false)
        #expect(UITestLaunch.isFixtureLaunch(arguments: ["-ui-test-fixture-board"]) == false)
    }

    /// The flag is double-dashed so `UserDefaults`' `NSArgumentDomain` — which reads `-key value`
    /// pairs — never sees it as a preference. Stated as a test because the consequence of getting it
    /// wrong is invisible: the app would work, and a stray defaults key would appear.
    @Test("The flag cannot be read as an argument-domain preference key")
    func flagIsNotAPreferenceKey() {
        #expect(UITestLaunch.fixtureFlag.hasPrefix("--"))
    }
}

// MARK: - The fixture board

@Suite("The audit fixture board")
struct UITestFixtureBoardTests {

    /// Builds the fixture exactly as a UI-test launch does, then reads it back through the ordinary
    /// loader — the app's own answer to "is this a board", so the assertion is the same one the
    /// board window would make.
    ///
    /// The scratch directory is prepared first (which is what wipes any previous run's board) and
    /// removed afterwards, so this test leaves the container as it found it.
    @Test("It builds, loads, and has the shape the audit suite navigates")
    func fixtureLoads() throws {
        UITestLaunch.prepareScratchDirectory()
        defer { try? FileManager.default.removeItem(at: UITestLaunch.scratchRoot) }

        let root = try UITestLaunch.materializeFixtureBoard()
        let model = try BoardLoader.load(boardRoot: root).model

        // The window title the UI suite waits on.
        #expect(model.title.value == UITestLaunch.boardTitle)
        #expect(root.lastPathComponent == "\(UITestLaunch.boardTitle).kanban")

        // Three lanes, in the order the fixture names them — which is also the order VoiceOver reads
        // them in (10-accessibility.md ▸ Logical order), so a fixture whose lanes came out shuffled
        // would make the traversal-order check meaningless.
        #expect(model.lanes.map(\.title.value) == UITestLaunch.laneTitles)

        // The first lane is the crowded one, minus the card the fixture deleted — the masonry
        // divergence the audit is most interested in needs more than one card to diverge.
        #expect(model.lanes[0].cards.count == UITestLaunch.cardTitles[0].count - 1)
        #expect(model.lanes[0].cards.allSatisfy { $0.title.value != UITestLaunch.cardTitles[0][UITestLaunch.trashedCardIndex.card] })

        // The trashed card is in the trash container and nowhere else — cards only, no lane entries
        // (03-board-ui.md § Trash).
        #expect(model.trash.count == 1)
        #expect(model.trash.first?.title.value == UITestLaunch.cardTitles[0][UITestLaunch.trashedCardIndex.card])

        // The rich card: the one the card-window audits open. Its window title is what the UI suite
        // waits on, its body is what Preview renders into the tree, and its attachment is what the
        // card element's value and the sidebar's row are made of.
        let richLane = model.lanes[UITestLaunch.richCardIndex.lane]
        let richCard = try #require(richLane.cards.first)
        #expect(richCard.title.value == UITestLaunch.cardTitles[UITestLaunch.richCardIndex.lane][UITestLaunch.richCardIndex.card])
        #expect(richCard.body.contains("## What this card is for"))
        #expect(richCard.attachments == [UITestLaunch.attachmentName])
    }

    /// Everything the fixture launch writes stays inside the app's own container — the sandbox
    /// constraint that decided the whole design (a path handed over on the command line would not be
    /// readable), stated as a test so a future "just use `/tmp`" cannot land quietly.
    @Test("Everything it writes is inside the app container")
    func scratchIsContained() {
        let container = URL(fileURLWithPath: NSTemporaryDirectory(), isDirectory: true).standardizedFileURL.path
        #expect(UITestLaunch.scratchRoot.standardizedFileURL.path.hasPrefix(container))
        #expect(UITestLaunch.registryStorageURL.standardizedFileURL.path.hasPrefix(container))
        #expect(UITestLaunch.fixtureBoardURL.standardizedFileURL.path.hasPrefix(container))
    }

    /// The fixture registry is **not** the real one — the clause that keeps an audit run out of the
    /// user's recents list.
    @Test("The fixture registry is not the app's real registry")
    @MainActor
    func registryIsRedirected() {
        #expect(UITestLaunch.registryStorageURL != BoardRegistry.defaultStorageURL)
    }
}