#if DEBUG
import SwiftUI
import UIKit

/// DEBUG 自检:加载 LLM 并跑一段 prompt,流式显示 token + 速率。
/// 同时显示沙盒 Application Support 路径,方便把模型拷进去。
struct DebugAIRunner: View {
    @State private var output: String = ""
    @State private var status: String = "未开始"
    @State private var rate: Double = 0
    @State private var running = false
    @State private var modelReady: Bool = false

    private var appSupportPath: String {
        (try? FileManager.default.url(
            for: .applicationSupportDirectory,
            in: .userDomainMask,
            appropriateFor: nil,
            create: false
        ).path) ?? "(无法获取)"
    }

    private var modelExpectedPath: String {
        appSupportPath + "/Models/Qwen3-1.7B-4bit"
    }

    var body: some View {
        VStack(alignment: .leading, spacing: 14) {
            Text("DEBUG · AI 自检")
                .font(.system(size: 15, weight: .semibold))
                .foregroundStyle(Tj.Palette.text)

            // 沙盒路径与模型状态卡
            VStack(alignment: .leading, spacing: 8) {
                Text("模型预期路径")
                    .font(.system(size: 11, weight: .medium))
                    .foregroundStyle(Tj.Palette.text3)
                Text(modelExpectedPath)
                    .font(.system(size: 10, design: .monospaced))
                    .foregroundStyle(Tj.Palette.text2)
                    .textSelection(.enabled)
                    .lineLimit(3)
                HStack(spacing: 8) {
                    Button("复制路径") {
                        UIPasteboard.general.string = modelExpectedPath
                    }
                    .font(.system(size: 11))
                    .buttonStyle(.borderless)

                    Spacer()

                    Text(modelReady ? "✓ 模型就绪" : "⚠ 模型未就绪")
                        .font(.system(size: 11, weight: .medium))
                        .foregroundStyle(modelReady ? Tj.Palette.leaf : Tj.Palette.brick)
                }
            }
            .padding(10)
            .background(
                RoundedRectangle(cornerRadius: 6)
                    .fill(Color.black.opacity(0.03))
            )

            // 推理状态
            HStack {
                Text("状态:\(status)")
                Spacer()
                Text(String(format: "%.1f tok/s", rate))
                    .foregroundStyle(Tj.Palette.text3)
                    .monospaced()
            }
            .font(.system(size: 12))

            Button(running ? "推理中..." : "跑一段 prompt") {
                Task { await run() }
            }
            .buttonStyle(TjPrimaryButton())
            .disabled(running)

            ScrollView {
                Text(output.isEmpty ? "(暂无输出)" : output)
                    .font(.system(.footnote, design: .monospaced))
                    .frame(maxWidth: .infinity, alignment: .leading)
                    .padding(10)
            }
            .frame(maxHeight: 240)
            .background(
                RoundedRectangle(cornerRadius: 6)
                    .fill(Color.black.opacity(0.04))
            )
        }
        .padding(16)
        .background(
            RoundedRectangle(cornerRadius: Tj.Radius.md)
                .fill(Color.yellow.opacity(0.08))
        )
        .padding(.horizontal, 16)
        .onAppear { refreshModelStatus() }
    }

    private func refreshModelStatus() {
        modelReady = ModelStore.shared.isReady(.llm)
    }

    @MainActor
    private func run() async {
        running = true
        output = ""
        rate = 0
        status = "加载模型..."
        do {
            try await AIRuntime.shared.prepare()
            status = "推理中..."

            let prompt = "用中文一句话介绍肝功能里 ALT 这个指标。"
            for try await chunk in await AIRuntime.shared.generate(
                prompt: prompt,
                maxTokens: 200
            ) {
                output += chunk.text
                rate = chunk.decodeRate
            }
            status = "完成 ✓"
        } catch {
            status = "失败:\(error.localizedDescription)"
        }
        running = false
        refreshModelStatus()
    }
}
#endif