import AppKit
import ConjureKit
import Testing

@Test @MainActor
func notesRoundTripIndependentMarkdownUnicodeAndImageContents() throws {
    let directory = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString)
    defer { try? FileManager.default.removeItem(at: directory) }
    let store = try NotesStore(directory: directory)
    let firstID = try store.create()
    let secondID = try store.create()
    #expect(store.notes.count == 2)
    #expect(store.notes.allSatisfy { $0.title == "Untitled Note" })

    let bitmap = try #require(NSBitmapImageRep(
        bitmapDataPlanes: nil, pixelsWide: 1, pixelsHigh: 1,
        bitsPerSample: 8, samplesPerPixel: 4, hasAlpha: true, isPlanar: false,
        colorSpaceName: .deviceRGB, bytesPerRow: 0, bitsPerPixel: 0
    ))
    bitmap.setColor(.red, atX: 0, y: 0)
    let png = try #require(bitmap.representation(using: .png, properties: [:]))
    let imageFile = FileWrapper(regularFileWithContents: png)
    imageFile.preferredFilename = "pixel.png"
    let attachment = NSTextAttachment(fileWrapper: imageFile)
    let first = NSMutableAttributedString(string: "\n  # 日本語 🦊  \n**bold** and `code`\n")
    first.append(NSAttributedString(attachment: attachment))
    let expectedFirstText = first.string
    try store.update(id: firstID, contents: first)
    first.mutableString.setString("Mutated caller buffer")
    #expect(store.notes.first { $0.id == firstID }?.contents.string == expectedFirstText)
    #expect(store.notes.first { $0.id == firstID }?.title == "# 日本語 🦊")

    try store.update(id: secondID, contents: NSAttributedString(string: "Second note"))
    try store.update(id: secondID, contents: NSAttributedString(string: "## Edited\n- café\n- Ελληνικά"))
    #expect(store.notes.first { $0.id == firstID }?.contents.string == expectedFirstText)

    let reloaded = try NotesStore(directory: directory)
    #expect(Set(reloaded.notes.map(\.id)) == Set([firstID, secondID]))
    let restoredFirst = try #require(reloaded.notes.first { $0.id == firstID })
    #expect(restoredFirst.contents.string == expectedFirstText)
    #expect(restoredFirst.title == "# 日本語 🦊")
    let restoredAttachment = try #require(restoredFirst.contents.attribute(
        .attachment, at: restoredFirst.contents.length - 1, effectiveRange: nil
    ) as? NSTextAttachment)
    let restoredPNG = try #require(restoredAttachment.fileWrapper?.regularFileContents)
    #expect(restoredPNG == png)
    #expect(NSImage(data: restoredPNG) != nil)
    #expect(reloaded.notes.first { $0.id == secondID }?.contents.string == "## Edited\n- café\n- Ελληνικά")
}

@Test @MainActor
func notesWriteFailuresPreserveSavedMemoryAndDiskContents() throws {
    let root = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString)
    defer { try? FileManager.default.removeItem(at: root) }
    let directory = root.appendingPathComponent("Notes")
    let backup = root.appendingPathComponent("SavedNotes")
    let store = try NotesStore(directory: directory)
    let id = try store.create()
    try store.update(id: id, contents: NSAttributedString(string: "Saved contents"))

    // A regular file in place of the parent directory fails even when tests run as root.
    try FileManager.default.moveItem(at: directory, to: backup)
    try Data("not a directory".utf8).write(to: directory)
    #expect(throws: (any Error).self) {
        try store.update(id: id, contents: NSAttributedString(string: "Unsaved changes"))
    }
    #expect(throws: (any Error).self) { try store.create() }
    #expect(store.notes.count == 1)
    #expect(store.notes.first?.contents.string == "Saved contents")
    #expect(store.notes.first?.title == "Saved contents")

    try FileManager.default.removeItem(at: directory)
    try FileManager.default.moveItem(at: backup, to: directory)
    let reloaded = try NotesStore(directory: directory)
    #expect(reloaded.notes.first?.id == id)
    #expect(reloaded.notes.first?.contents.string == "Saved contents")
}

@Test @MainActor
func corruptPersistedNotesRaiseErrorsWithoutReplacement() throws {
    let directory = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString)
    defer { try? FileManager.default.removeItem(at: directory) }
    let package = directory.appendingPathComponent(UUID().uuidString + ".rtfd")
    try FileManager.default.createDirectory(at: package, withIntermediateDirectories: true)
    let corruptRTF = package.appendingPathComponent("TXT.rtf")
    let bytes = Data("This is not an RTF document".utf8)
    try bytes.write(to: corruptRTF)

    #expect(throws: (any Error).self) { try NotesStore(directory: directory) }
    #expect(try Data(contentsOf: corruptRTF) == bytes)
}

@Test @MainActor
func noteTitlesUseFirstNonemptyLineAndCapAtSixtyCharacters() throws {
    let directory = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString)
    defer { try? FileManager.default.removeItem(at: directory) }
    let store = try NotesStore(directory: directory)
    let id = try store.create()
    try store.update(id: id, contents: NSAttributedString(string: "\n \t\n  " + String(repeating: "🦊", count: 70) + "  \nIgnored"))
    #expect(store.notes.first?.title == String(repeating: "🦊", count: 60))
    try store.update(id: id, contents: NSAttributedString(string: " \t\n\n"))
    #expect(store.notes.first?.title == "Untitled Note")
}

@Test @MainActor
func deletingNotesPersistsWithoutChangingOtherNotesAndPreservesMemoryOnFailure() throws {
    let directory = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString)
    let backup = directory.appendingPathExtension("backup")
    defer {
        try? FileManager.default.removeItem(at: directory)
        try? FileManager.default.removeItem(at: backup)
    }
    let store = try NotesStore(directory: directory)
    let deleted = try store.create()
    let kept = try store.create()
    try store.update(id: kept, contents: NSAttributedString(string: "Keep this note"))
    try store.delete(id: deleted)
    #expect(store.notes.map(\.id) == [kept])
    #expect(try NotesStore(directory: directory).notes.map(\.id) == [kept])
    #expect(throws: (any Error).self) { try store.delete(id: deleted) }

    try FileManager.default.moveItem(at: directory, to: backup)
    try Data("Blocked storage".utf8).write(to: directory)
    #expect(throws: (any Error).self) { try store.delete(id: kept) }
    #expect(store.notes.map(\.id) == [kept])
    #expect(store.notes.first?.contents.string == "Keep this note")
    try FileManager.default.removeItem(at: directory)
    try FileManager.default.moveItem(at: backup, to: directory)
    #expect(try NotesStore(directory: directory).notes.first?.contents.string == "Keep this note")
    try store.delete(id: kept)
    #expect(store.notes.isEmpty)
    #expect(try NotesStore(directory: directory).notes.isEmpty)
}