Reverse Engineering Claude Code: Building the Future of AI Development Tools

// Core Architecture Components
protocol AICodeInterface {
    func processFileContext(_ files: [File]) async throws -> Context
    func executeCommand(_ command: String, context: Context) async throws -> Response
    func manageConversationState(_ state: ConversationState) async
}

class ClaudeCodeAnalyzer {
    // Terminal interface management
    let terminalSession: TerminalSession
    
    // File system monitoring
    let fileWatcher: FileSystemWatcher
    
    // AI model interface
    let modelInterface: LLMInterface
    
    // Context management
    let contextManager: ContextManager
}

import SwiftUI
import Combine
import Foundation

@main
struct SwiftClaudeApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(AIAssistant())
                .environmentObject(ProjectManager())
        }
    }
}

class AIAssistant: ObservableObject {
    @Published var conversations: [Conversation] = []
    @Published var currentProject: Project?
    
    private let modelClient: LLMClient
    private let terminalInterface: TerminalInterface
    private let codeAnalyzer: CodeAnalyzer
    
    func processUserInput(_ input: String) async {
        // Parse intent and context
        let intent = await parseIntent(input)
        let context = await gatherContext()
        
        // Execute AI reasoning
        let response = await modelClient.process(intent, context: context)
        
        // Execute any required actions
        await executeActions(response.actions)
    }
}

class TerminalInterface: ObservableObject {
    private var process: Process?
    @Published var output: String = ""
    
    func executeCommand(_ command: String) async throws -> String {
        return try await withCheckedThrowingContinuation { continuation in
            let process = Process()
            process.executableURL = URL(fileURLWithPath: "/bin/bash")
            process.arguments = ["-c", command]
            
            let pipe = Pipe()
            process.standardOutput = pipe
            
            process.terminationHandler = { _ in
                let data = pipe.fileHandleForReading.readDataToEndOfFile()
                let output = String(data: data, encoding: .utf8) ?? ""
                continuation.resume(returning: output)
            }
            
            try process.run()
        }
    }
}

class CodeAnalyzer {
    func analyzeProject(_ projectPath: URL) async throws -> ProjectContext {
        let fileManager = FileManager.default
        var contexts: [FileContext] = []
        
        // Recursively analyze files
        let enumerator = fileManager.enumerator(at: projectPath, 
                                               includingPropertiesForKeys: [.isRegularFileKey])
        
        while let fileURL = enumerator?.nextObject() as? URL {
            if isCodeFile(fileURL) {
                let context = try await analyzeFile(fileURL)
                contexts.append(context)
            }
        }
        
        return ProjectContext(files: contexts, structure: await buildProjectStructure(projectPath))
    }
    
    private func analyzeFile(_ url: URL) async throws -> FileContext {
        let content = try String(contentsOf: url)
        let syntaxTree = try parseSyntax(content, language: detectLanguage(url))
        
        return FileContext(
            url: url,
            content: content,
            syntaxTree: syntaxTree,
            imports: extractImports(syntaxTree),
            functions: extractFunctions(syntaxTree),
            classes: extractClasses(syntaxTree)
        )
    }
}

class LLMClient {
    private let apiKey: String
    private let endpoint: URL
    
    func process(_ intent: Intent, context: ProjectContext) async throws -> AIResponse {
        let prompt = buildPrompt(intent: intent, context: context)
        
        var request = URLRequest(url: endpoint)
        request.httpMethod = "POST"
        request.setValue("Bearer \(apiKey)", forHTTPHeaderField: "Authorization")
        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
        
        let payload = AIRequest(
            model: "claude-3-5-sonnet",
            messages: [Message(role: "user", content: prompt)],
            tools: availableTools
        )
        
        request.httpBody = try JSONEncoder().encode(payload)
        
        let (data, _) = try await URLSession.shared.data(for: request)
        return try JSONDecoder().decode(AIResponse.self, from: data)
    }
}

class FileSystemWatcher: ObservableObject {
    private var eventStream: FSEventStreamRef?
    @Published var changes: [FileChange] = []
    
    func startWatching(_ path: String) {
        let callback: FSEventStreamCallback = { _, clientCallBackInfo, numEvents, eventPaths, eventFlags, eventIds in
            guard let watcher = clientCallBackInfo?.assumingMemoryBound(to: FileSystemWatcher.self).pointee else { return }
            
            let paths = eventPaths.assumingMemoryBound(to: UnsafePointer<CChar>.self)
            
            for i in 0..<numEvents {
                let path = String(cString: paths[i])
                let flags = eventFlags[i]
                
                DispatchQueue.main.async {
                    watcher.processFileChange(path: path, flags: flags)
                }
            }
        }
        
        var context = FSEventStreamContext(
            version: 0,
            info: UnsafeMutableRawPointer(Unmanaged.passUnretained(self).toOpaque()),
            retain: nil,
            release: nil,
            copyDescription: nil
        )
        
        eventStream = FSEventStreamCreate(
            nil,
            callback,
            &context,
            [path] as CFArray,
            FSEventStreamEventId(kFSEventStreamEventIdSinceNow),
            1.0,
            FSEventStreamCreateFlags(kFSEventStreamCreateFlagUseCFTypes | kFSEventStreamCreateFlagFileEvents)
        )
        
        FSEventStreamScheduleWithRunLoop(eventStream!, CFRunLoopGetCurrent(), CFRunLoopMode.defaultMode.rawValue)
        FSEventStreamStart(eventStream!)
    }
}

// iOS companion for code review and quick edits
struct iOSCodeAssistant: View {
    @StateObject private var assistant = MobileAIAssistant()
    @State private var inputText = ""
    
    var body: some View {
        NavigationView {
            VStack {
                ScrollView {
                    LazyVStack {
                        ForEach(assistant.conversations) { conversation in
                            ConversationBubble(conversation: conversation)
                        }
                    }
                }
                
                HStack {
                    TextField("Ask about your code...", text: $inputText)
                        .textFieldStyle(RoundedBorderTextFieldStyle())
                    
                    Button("Send") {
                        Task {
                            await assistant.processInput(inputText)
                            inputText = ""
                        }
                    }
                }
                .padding()
            }
            .navigationTitle("Code Assistant")
        }
    }
}

protocol AITool {
    var name: String { get }
    var description: String { get }
    func execute(parameters: [String: Any]) async throws -> ToolResult
}

class GitTool: AITool {
    let name = "git"
    let description = "Execute git commands and analyze repository state"
    
    func execute(parameters: [String: Any]) async throws -> ToolResult {
        guard let command = parameters["command"] as? String else {
            throw ToolError.missingParameters
        }
        
        let terminal = TerminalInterface()
        let output = try await terminal.executeCommand("git \(command)")
        
        return ToolResult(
            success: true,
            output: output,
            metadata: ["command": command]
        )
    }
}

class CompilerTool: AITool {
    let name = "compiler"
    let description = "Compile code and analyze errors"
    
    func execute(parameters: [String: Any]) async throws -> ToolResult {
        guard let language = parameters["language"] as? String,
              let code = parameters["code"] as? String else {
            throw ToolError.missingParameters
        }
        
        // Create temporary file and compile
        let tempFile = createTempFile(content: code, extension: getExtension(for: language))
        let result = try await compileFile(tempFile, language: language)
        
        return ToolResult(
            success: result.success,
            output: result.output,
            metadata: ["errors": result.errors, "warnings": result.warnings]
        )
    }
}

// Example: SwiftUI-specific AI assistance
class SwiftUIAssistant {
    func generatePreviewCode(for view: String) async -> String {
        let prompt = """
        Generate SwiftUI preview code for this view: \(view)
        Include multiple device previews and different data states.
        """
        
        let response = await aiClient.process(prompt)
        return response.code
    }
    
    func optimizeSwiftUIPerformance(_ code: String) async -> [OptimizationSuggestion] {
        // Analyze SwiftUI code for performance issues
        // Suggest @State, @ObservedObject, @StateObject optimizations
        // Identify unnecessary view updates
        return await performanceAnalyzer.analyze(code)
    }
}