package com.narutohuo.xindazhou.nfc.impl

import android.app.Activity
import android.content.Intent
import android.nfc.NfcAdapter
import android.nfc.NfcManager
import android.provider.Settings
import android.util.Log
import com.narutohuo.xindazhou.nfc.api.NFCService
import com.narutohuo.xindazhou.nfc.model.NFCResponse

/**
 * NFC服务实现类（单例模式）
 * 
 * 使用单例方便管理，多个界面可以共享同一个NFC服务
 * 注意：NFC需要Activity上下文，但单例内部会管理当前Activity
 * 
 * 注意：具体实现需要根据业务需求完善
 * 当前为基础框架，具体逻辑待实现
 */
class NFCServiceImpl private constructor() : NFCService {
    
    companion object {
        @Volatile
        private var INSTANCE: NFCServiceImpl? = null
        
        /**
         * 获取NFC服务单例
         */
        @JvmStatic
        fun getInstance(): NFCServiceImpl {
            return INSTANCE ?: synchronized(this) {
                INSTANCE ?: NFCServiceImpl().also { INSTANCE = it }
            }
        }
        
        /**
         * 销毁单例（用于测试）
         */
        @JvmStatic
        fun destroyInstance() {
            INSTANCE = null
        }
    }
    
    private val tag = "NFCService"
    private var currentActivity: Activity? = null
    private var nfcAdapter: NfcAdapter? = null
    private var tagDiscoveredListener: ((NFCResponse) -> Unit)? = null
    
    override fun initialize(activity: Activity) {
        Log.d(tag, "initialize: NFC服务初始化")
        this.currentActivity = activity
        val nfcManager = activity.getSystemService(Activity.NFC_SERVICE) as? NfcManager
        nfcAdapter = nfcManager?.defaultAdapter
        // TODO: 初始化NFC相关配置
    }
    
    override fun isNFCSupported(): Boolean {
        val supported = nfcAdapter != null
        Log.d(tag, "isNFCSupported: $supported")
        return supported
    }
    
    override fun isNFCEnabled(): Boolean {
        val enabled = nfcAdapter?.isEnabled == true
        Log.d(tag, "isNFCEnabled: $enabled")
        return enabled
    }
    
    override fun enableNFC(activity: Activity) {
        Log.d(tag, "enableNFC: 跳转到NFC设置")
        this.currentActivity = activity
        activity.startActivity(Intent(Settings.ACTION_NFC_SETTINGS))
    }
    
    override fun readTag(callback: (NFCResponse) -> Unit) {
        Log.d(tag, "readTag: 读取NFC标签（待实现）")
        // TODO: 实现NFC标签读取逻辑
        callback(
            NFCResponse(
                success = false,
                data = null,
                errorMessage = "Not implemented"
            )
        )
    }
    
    override fun writeTag(data: ByteArray, callback: (NFCResponse) -> Unit) {
        Log.d(tag, "writeTag: 写入NFC标签 ${data.size} bytes（待实现）")
        // TODO: 实现NFC标签写入逻辑
        callback(
            NFCResponse(
                success = false,
                data = null,
                errorMessage = "Not implemented"
            )
        )
    }
    
    override fun setTagDiscoveredListener(listener: (NFCResponse) -> Unit) {
        this.tagDiscoveredListener = listener
        Log.d(tag, "setTagDiscoveredListener: 设置NFC标签发现监听器")
        // TODO: 实现NFC标签发现监听
    }
}

