import Foundation

// Stub implementation when FoundationModels is not available
// This file is compiled via Cargo build script when the build environment
// does not support Apple Intelligence (e.g. older Xcode/SDK).

private typealias ResponsePointer = UnsafeMutablePointer<AppleLLMResponse>

@_cdecl("is_apple_intelligence_available")
public func isAppleIntelligenceAvailable() -> Int32 {
    return 0
}

@_cdecl("process_text_with_apple_llm")
public func processTextWithAppleLLM(
    _ prompt: UnsafePointer<CChar>,
    maxTokens: Int32
) -> UnsafeMutablePointer<AppleLLMResponse> {
    let responsePtr = ResponsePointer.allocate(capacity: 1)
    // Initialize with safe defaults
    responsePtr.initialize(to: AppleLLMResponse(response: nil, success: 0, error_message: nil))
    
    let msg = "Apple Intelligence is not available in this build (SDK requirement not met)."
    
    // Duplicate the string for the C caller to own
    responsePtr.pointee.error_message = strdup(msg)
    
    return responsePtr
}

@_cdecl("free_apple_llm_response")
public func freeAppleLLMResponse(_ response: UnsafeMutablePointer<AppleLLMResponse>?) {
    guard let response = response else { return }
    
    if let responseStr = response.pointee.response {
        free(UnsafeMutablePointer(mutating: responseStr))
    }
    
    if let errorStr = response.pointee.error_message {
        free(UnsafeMutablePointer(mutating: errorStr))
    }
    
    response.deallocate()
}