import Foundation
import Testing
import ShotdeckCore

@Test
func syncRootsFindsOneDriveDirsMMDFirstIgnoresNonDirsAndOtherProviders() throws {
    let home = try makeFakeHome()
    defer { try? FileManager.default.removeItem(at: home) }
    let cloudStorage = home.appendingPathComponent("Library/CloudStorage", isDirectory: true)
    try FileManager.default.createDirectory(at: cloudStorage, withIntermediateDirectories: true)

    try FileManager.default.createDirectory(
        at: cloudStorage.appendingPathComponent("OneDrive-Flowmaster", isDirectory: true),
        withIntermediateDirectories: true
    )
    try FileManager.default.createDirectory(
        at: cloudStorage.appendingPathComponent("OneDrive-MMDGROUP", isDirectory: true),
        withIntermediateDirectories: true
    )
    try FileManager.default.createDirectory(
        at: cloudStorage.appendingPathComponent("GoogleDrive-x", isDirectory: true),
        withIntermediateDirectories: true
    )
    // A plain FILE (not a directory) named like a OneDrive root must be ignored.
    FileManager.default.createFile(
        atPath: cloudStorage.appendingPathComponent("OneDrive-notadir").path,
        contents: Data("not a directory".utf8)
    )

    let roots = OneDriveLocator.syncRoots(home: home, fileManager: .default)

    #expect(roots.map(\.lastPathComponent) == ["OneDrive-MMDGROUP", "OneDrive-Flowmaster"])
}

@Test
func syncRootsEmptyAndDefaultFolderNilWithNoCloudStorageDirectory() throws {
    let home = try makeFakeHome()
    defer { try? FileManager.default.removeItem(at: home) }
    // No Library/CloudStorage created at all.

    let roots = OneDriveLocator.syncRoots(home: home, fileManager: .default)
    #expect(roots.isEmpty)

    let defaultFolder = OneDriveLocator.defaultRedlineFolder(home: home, fileManager: .default)
    #expect(defaultFolder == nil)
}

@Test
func defaultRedlineFolderIsFirstSyncRootPlusRedline() throws {
    let home = try makeFakeHome()
    defer { try? FileManager.default.removeItem(at: home) }
    let cloudStorage = home.appendingPathComponent("Library/CloudStorage", isDirectory: true)
    try FileManager.default.createDirectory(
        at: cloudStorage.appendingPathComponent("OneDrive-MMDGROUP", isDirectory: true),
        withIntermediateDirectories: true
    )
    try FileManager.default.createDirectory(
        at: cloudStorage.appendingPathComponent("OneDrive-Flowmaster", isDirectory: true),
        withIntermediateDirectories: true
    )

    let defaultFolder = try #require(
        OneDriveLocator.defaultRedlineFolder(home: home, fileManager: .default)
    )
    // Derive "expected" from syncRoots() itself (already covered by its own dedicated
    // test) rather than hand-building the path string — FileManager's directory
    // enumeration can canonicalize /var -> /private/var and the two constructions
    // otherwise disagree on that even for a URL that already exists.
    let expectedRoot = try #require(OneDriveLocator.syncRoots(home: home, fileManager: .default).first)
    let expected = expectedRoot.appendingPathComponent("Redline", isDirectory: true)
    #expect(defaultFolder.path == expected.path)
}

@Test
func resolveOneDriveFolderPrefersAnExistingStoredOverride() throws {
    let home = try makeFakeHome()
    defer { try? FileManager.default.removeItem(at: home) }
    let cloudStorage = home.appendingPathComponent("Library/CloudStorage", isDirectory: true)
    try FileManager.default.createDirectory(
        at: cloudStorage.appendingPathComponent("OneDrive-MMDGROUP", isDirectory: true),
        withIntermediateDirectories: true
    )

    let suite = try makeTransportDefaultsSuite()
    defer { tearDownTransportSuite(suite) }
    let override = try makeTransportTemporaryDirectory(prefix: "shotdeck-onedrive-override")
    defer { try? FileManager.default.removeItem(at: override) }
    TransportSettings.setOneDriveFolder(override, defaults: suite.defaults)

    let resolved = OneDriveLocator.resolveOneDriveFolder(
        defaults: suite.defaults, home: home, fileManager: .default
    )
    #expect(resolved?.path == override.path)
}

@Test
func resolveOneDriveFolderIgnoresAStoredPathThatNoLongerExists() throws {
    let home = try makeFakeHome()
    defer { try? FileManager.default.removeItem(at: home) }
    let cloudStorage = home.appendingPathComponent("Library/CloudStorage", isDirectory: true)
    try FileManager.default.createDirectory(
        at: cloudStorage.appendingPathComponent("OneDrive-MMDGROUP", isDirectory: true),
        withIntermediateDirectories: true
    )

    let suite = try makeTransportDefaultsSuite()
    defer { tearDownTransportSuite(suite) }
    let goneOverride = try makeTransportTemporaryDirectory(prefix: "shotdeck-onedrive-gone")
    TransportSettings.setOneDriveFolder(goneOverride, defaults: suite.defaults)
    try FileManager.default.removeItem(at: goneOverride)

    let resolved = OneDriveLocator.resolveOneDriveFolder(
        defaults: suite.defaults, home: home, fileManager: .default
    )
    let expectedRoot = try #require(OneDriveLocator.syncRoots(home: home, fileManager: .default).first)
    let expected = expectedRoot.appendingPathComponent("Redline", isDirectory: true)
    #expect(resolved?.path == expected.path)
}

private func makeFakeHome() throws -> URL {
    let home = FileManager.default.temporaryDirectory
        .appendingPathComponent("shotdeck-fake-home-\(UUID().uuidString)", isDirectory: true)
    try FileManager.default.createDirectory(at: home, withIntermediateDirectories: true)
    return home
}