dudu/ios/spike-kb-mic/App/SpikeApp.swift

// 容器 App：引导启用键盘 + 在 App 内先验证一次正常录音（对照组）
import AVFoundation
import SwiftUI

@main
struct SpikeApp: App {
    var body: some Scene {
        WindowGroup { ContentView() }
    }
}

struct ContentView: View {
    @State private var appMicResult = "未测试"

    var body: some View {
        VStack(alignment: .leading, spacing: 16) {
            Text("dudu 键盘录音 spike").font(.title2).bold()
            Text("""
            步骤：
            1. 点下方按钮，先验证 App 内录音（对照组）
            2. 设置 → 通用 → 键盘 → 添加 DuduKbMicSpike
            3. 打开"允许完全访问"
            4. 任意输入框切到该键盘，按"测试键盘内录音"
            5. 把键盘上显示的结果告诉 Claude
            """).font(.callout)
            Button("测试 App 内录音（对照组）") {
                testAppMic { appMicResult = $0 }
            }
            .buttonStyle(.borderedProminent)
            Text("App 内结果：\(appMicResult)").font(.callout).monospaced()
            Spacer()
        }
        .padding(24)
    }
}

func testAppMic(done: @escaping (String) -> Void) {
    AVAudioApplication.requestRecordPermission { granted in
        DispatchQueue.main.async {
            guard granted else { return done("麦克风权限被拒") }
            do {
                let session = AVAudioSession.sharedInstance()
                try session.setCategory(.record, mode: .measurement)
                try session.setActive(true)
                let engine = AVAudioEngine()
                var frames: UInt32 = 0
                engine.inputNode.installTap(onBus: 0, bufferSize: 1024, format: nil) { buf, _ in
                    frames += buf.frameLength
                }
                try engine.start()
                DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
                    engine.stop()
                    done(frames > 0 ? "✅ 收到 \(frames) 帧" : "❌ 无音频回调")
                }
            } catch {
                done("❌ \(error.localizedDescription)")
            }
        }
    }
}