package com.example.myapplication

import android.os.Bundle
import android.util.Log
import android.view.View
import android.widget.Toast
import androidx.activity.OnBackPressedCallback
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import androidx.navigation.NavController
import androidx.navigation.fragment.NavHostFragment
import com.example.myapplication.network.AuthEvent
import com.example.myapplication.network.AuthEventBus
import com.example.myapplication.network.BehaviorReporter
import com.example.myapplication.utils.EncryptedSharedPreferencesUtil
import com.google.android.material.bottomnavigation.BottomNavigationView
import kotlinx.coroutines.flow.collectLatest
import kotlinx.coroutines.launch

class MainActivity : AppCompatActivity() {

    private lateinit var bottomNav: BottomNavigationView

    private val TAB_HOME = "tab_home"
    private val TAB_SHOP = "tab_shop"
    private val TAB_MINE = "tab_mine"
    private val GLOBAL_HOST = "global_host"

    private var currentTabTag = TAB_HOME
    private var pendingTabAfterLogin: String? = null

    private val protectedTabs = setOf(
        R.id.shop_graph,
        R.id.mine_graph
    )

    private val tabMap by lazy {
        mapOf(
            R.id.home_graph to TAB_HOME,
            R.id.shop_graph to TAB_SHOP,
            R.id.mine_graph to TAB_MINE
        )
    }

    private lateinit var homeHost: NavHostFragment
    private lateinit var shopHost: NavHostFragment
    private lateinit var mineHost: NavHostFragment
    private lateinit var globalHost: NavHostFragment
    private var lastGlobalDestId: Int = R.id.globalEmptyFragment

    private val currentTabHost: NavHostFragment
        get() = when (currentTabTag) {
            TAB_SHOP -> shopHost
            TAB_MINE -> mineHost
            else -> homeHost
        }

    private val currentTabNavController: NavController
        get() = currentTabHost.navController

    private val globalNavController: NavController
        get() = globalHost.navController

    // =======================
    // 全局路由埋点：新增字段
    // =======================
    private val ROUTE_TAG = "RouteReport"

    private var lastHomeDestIdForReport: Int? = null
    private var lastShopDestIdForReport: Int? = null
    private var lastMineDestIdForReport: Int? = null
    private var lastGlobalDestIdForReport: Int? = null

    // 统一 listener，方便 add/remove
    private val homeRouteListener =
        NavController.OnDestinationChangedListener { _, dest, _ ->
            if (lastHomeDestIdForReport == dest.id) return@OnDestinationChangedListener
            lastHomeDestIdForReport = dest.id
            reportPageView(source = "home_tab", destId = dest.id)
        }

    private val shopRouteListener =
        NavController.OnDestinationChangedListener { _, dest, _ ->
            if (lastShopDestIdForReport == dest.id) return@OnDestinationChangedListener
            lastShopDestIdForReport = dest.id
            reportPageView(source = "shop_tab", destId = dest.id)
        }

    private val mineRouteListener =
        NavController.OnDestinationChangedListener { _, dest, _ ->
            if (lastMineDestIdForReport == dest.id) return@OnDestinationChangedListener
            lastMineDestIdForReport = dest.id
            reportPageView(source = "mine_tab", destId = dest.id)
        }

    private val globalRouteListener =
        NavController.OnDestinationChangedListener { _, dest, _ ->
            if (lastGlobalDestIdForReport == dest.id) return@OnDestinationChangedListener
            lastGlobalDestIdForReport = dest.id
            reportPageView(source = "global_overlay", destId = dest.id)
        }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        bottomNav = findViewById(R.id.bottom_nav)
        bottomNav.itemIconTintList = null
        bottomNav.setOnItemReselectedListener { /* ignore */ }

        // 1) 恢复当前tab
        currentTabTag = savedInstanceState?.getString("current_tab_tag") ?: TAB_HOME

        // 2) 初始化/找回 3个Tab host + global host
        initHosts()

        // 3) 底栏点击：show/hide 切 tab（带登录拦截 + 防 stateSaved）
        bottomNav.setOnItemSelectedListener { item ->
            val tabTag = tabMap[item.itemId] ?: return@setOnItemSelectedListener false

            // 登录拦截：未登录点受保护tab => 打开全局login
            if (!isLoggedIn() && item.itemId in protectedTabs) {
                // 强制回到当前tab的选中状态，避免底栏短暂闪一下
                bottomNav.selectedItemId = when (currentTabTag) {
                    TAB_SHOP -> R.id.shop_graph
                    TAB_MINE -> R.id.mine_graph
                    else -> R.id.home_graph
                }
                pendingTabAfterLogin = tabTag  // 记录目标tab
                openGlobal(R.id.loginFragment)
                return@setOnItemSelectedListener false
            }

            switchTab(tabTag)
            true
        }

        // 4) token过期：走全局 overlay，且避免重复打开
        lifecycleScope.launch {
            AuthEventBus.events.collectLatest { event ->
                when (event) {
                    is AuthEvent.TokenExpired -> {
                        pendingTabAfterLogin = null
                        // 已经在login就别重复
                        if (!isGlobalVisible() || globalNavController.currentDestination?.id != R.id.loginFragment) {
                            openGlobal(R.id.loginFragment)
                        }
                    }

                    is AuthEvent.GenericError -> {
                        Toast.makeText(this@MainActivity, event.message, Toast.LENGTH_LONG).show()
                    }

                    // 登录成功事件处理
                    is AuthEvent.LoginSuccess -> {
                        // 关闭 global overlay：回到 empty
                        globalNavController.popBackStack(R.id.globalEmptyFragment, false)

                        // 如果之前想去商城/我的，登录成功后自动切过去
                        pendingTabAfterLogin?.let { tag ->
                            switchTab(tag)
                            bottomNav.selectedItemId = when (tag) {
                                TAB_SHOP -> R.id.shop_graph
                                TAB_MINE -> R.id.mine_graph
                                else -> R.id.home_graph
                            }
                        }
                        pendingTabAfterLogin = null

                        // 处理intent跳转目标页
                        if (pendingNavigationAfterLogin == "recharge_fragment") {
                            openGlobal(R.id.rechargeFragment)
                            pendingNavigationAfterLogin = null
                        }

                        // ✅ 登录成功后也刷新一次
                        bottomNav.post { updateBottomNavVisibility() }
                    }

                    // 登出事件处理
                    is AuthEvent.Logout -> {
                        pendingTabAfterLogin = event.returnTabTag

                        // ✅ 用户没登录按返回，应回首页，所以先切到首页
                        switchTab(TAB_HOME, force = true)

                        bottomNav.post {
                            bottomNav.selectedItemId = R.id.home_graph
                            openGlobal(R.id.loginFragment) // ✅ 退出登录后立刻打开登录页
                        }
                    }

                    // 打开全局页面事件处理
                    is AuthEvent.OpenGlobalPage -> {
                        openGlobal(event.destinationId, event.bundle)
                    }

                    is AuthEvent.UserUpdated -> {
                        // 不需要处理
                    }

                    is AuthEvent.CharacterDeleted -> {
                        // 不需要处理
                    }

                    is AuthEvent.CharacterAdded -> {
                        // 不需要处理，由HomeFragment处理
                    }
                }
            }
        }

        // 5) intent跳转（充值等）统一走全局 overlay
        handleNavigationFromIntent()

        // 6) 返回键规则：优先关闭global，其次pop当前tab
        setupBackPress()

        // 7) 初始选中正确tab（不会触发二次创建）
        bottomNav.post {
            bottomNav.selectedItemId = when (currentTabTag) {
                TAB_SHOP -> R.id.shop_graph
                TAB_MINE -> R.id.mine_graph
                else -> R.id.home_graph
            }
            updateBottomNavVisibility()
        }
    }

    override fun onResume() {
        super.onResume()
        // ✅ 最终兜底：从后台回来 / 某些场景没触发 listener，也能恢复底栏
        bottomNav.post { updateBottomNavVisibility() }
    }

    override fun onDestroy() {
        // ✅ 防泄漏：移除路由监听（Activity 销毁时）
        runCatching {
            homeHost.navController.removeOnDestinationChangedListener(homeRouteListener)
            shopHost.navController.removeOnDestinationChangedListener(shopRouteListener)
            mineHost.navController.removeOnDestinationChangedListener(mineRouteListener)
            globalHost.navController.removeOnDestinationChangedListener(globalRouteListener)
        }
        super.onDestroy()
    }

    private fun initHosts() {
        val fm = supportFragmentManager

        homeHost = fm.findFragmentByTag(TAB_HOME) as? NavHostFragment
            ?: NavHostFragment.create(R.navigation.home_graph)
        shopHost = fm.findFragmentByTag(TAB_SHOP) as? NavHostFragment
            ?: NavHostFragment.create(R.navigation.shop_graph)
        mineHost = fm.findFragmentByTag(TAB_MINE) as? NavHostFragment
            ?: NavHostFragment.create(R.navigation.mine_graph)

        globalHost = fm.findFragmentByTag(GLOBAL_HOST) as? NavHostFragment
            ?: NavHostFragment.create(R.navigation.global_graph)

        // 第一次创建时 add；后续进程重建会自动恢复，无需重复 add
        if (fm.findFragmentByTag(TAB_HOME) == null) {
            fm.beginTransaction()
                .setReorderingAllowed(true)
                .add(R.id.tab_container, homeHost, TAB_HOME)
                .add(R.id.tab_container, shopHost, TAB_SHOP).hide(shopHost)
                .add(R.id.tab_container, mineHost, TAB_MINE).hide(mineHost)
                .commitNow()
        }

        if (fm.findFragmentByTag(GLOBAL_HOST) == null) {
            fm.beginTransaction()
                .setReorderingAllowed(true)
                .add(R.id.global_container, globalHost, GLOBAL_HOST)
                .commitNow()
        }

        // 确保当前tab可见
        switchTab(currentTabTag, force = true)

        // 绑定全局导航可见性监听
        bindGlobalVisibility()

        // 绑定底部导航栏可见性监听
        bindBottomNavVisibilityForTabs()

        // ✅ 全局路由埋点监听（每次导航变化上报）
        bindGlobalRouteReporting()

        bottomNav.post { updateBottomNavVisibility() }
    }

    /**
     * 这些页面需要隐藏底部导航栏：你按需加/减
     */
    private fun shouldHideBottomNav(destId: Int): Boolean {
        return destId in setOf(
            R.id.searchFragment,
            R.id.searchResultFragment,
            R.id.MySkin,
            R.id.notificationFragment,
            R.id.feedbackFragment,
            R.id.MyKeyboard,
            R.id.PersonalSettings,
        )
    }

    /**
     * ✅ 统一底栏显隐逻辑：任何地方状态变化都调用它
     */
    private fun updateBottomNavVisibility() {
        // ✅ 只要 global overlay 不在 empty，底栏必须隐藏（用 NavController 判断，别用 View.visibility）
        if (isGlobalVisible()) {
            bottomNav.visibility = View.GONE
            return
        }

        // 否则按“当前可见 tab 的当前目的地”判断
        val destId = currentTabNavController.currentDestination?.id
        bottomNav.visibility =
            if (destId != null && shouldHideBottomNav(destId)) View.GONE else View.VISIBLE
    }

    private fun bindGlobalVisibility() {
        globalNavController.addOnDestinationChangedListener { _, dest, _ ->
            val isEmpty = dest.id == R.id.globalEmptyFragment

            findViewById<View>(R.id.global_container).visibility =
                if (isEmpty) View.GONE else View.VISIBLE

            // ✅ 底栏统一走 update
            updateBottomNavVisibility()

            val justClosedOverlay =
                (dest.id == R.id.globalEmptyFragment && lastGlobalDestId != R.id.globalEmptyFragment)
            lastGlobalDestId = dest.id

            if (justClosedOverlay) {
                val currentTabGraphId = when (currentTabTag) {
                    TAB_SHOP -> R.id.shop_graph
                    TAB_MINE -> R.id.mine_graph
                    else -> R.id.home_graph
                }

                if (!isLoggedIn() && currentTabGraphId in protectedTabs) {
                    switchTab(TAB_HOME, force = true)
                    bottomNav.selectedItemId = R.id.home_graph
                }

                if (!isLoggedIn()) {
                    pendingTabAfterLogin = null
                }

                bottomNav.post { updateBottomNavVisibility() }
            }
        }
    }

    private fun switchTab(targetTag: String, force: Boolean = false) {
        if (!force && targetTag == currentTabTag) return

        val fm = supportFragmentManager
        if (fm.isStateSaved) return

        currentTabTag = targetTag

        fm.beginTransaction()
            .setReorderingAllowed(true)
            .hide(homeHost)
            .hide(shopHost)
            .hide(mineHost)
            .also { ft ->
                when (targetTag) {
                    TAB_SHOP -> ft.show(shopHost)
                    TAB_MINE -> ft.show(mineHost)
                    else -> ft.show(homeHost)
                }
            }
            .commit()

        // ✅ 关键：hide/show 切 tab 不会触发 destinationChanged，所以手动刷新
        bottomNav.post { updateBottomNavVisibility() }

        // ✅ 新增：切 tab 后补一次路由上报（不改变其它逻辑）
        if (!force) {
            currentTabNavController.currentDestination?.id?.let { destId ->
                reportPageView(source = "switch_tab", destId = destId)
            }
        }
    }

    /** 打开全局页（login/recharge等） */
    private fun openGlobal(destId: Int, bundle: Bundle? = null) {
        val fm = supportFragmentManager
        if (fm.isStateSaved) return

        try {
            if (bundle != null) globalNavController.navigate(destId, bundle)
            else globalNavController.navigate(destId)
        } catch (e: IllegalArgumentException) {
            e.printStackTrace()
        }

        bottomNav.post { updateBottomNavVisibility() }
    }

    /** Tab 内页面变化时刷新底栏显隐 */
    private fun bindBottomNavVisibilityForTabs() {
        val listener = NavController.OnDestinationChangedListener { _, _, _ ->
            updateBottomNavVisibility()
        }

        homeHost.navController.addOnDestinationChangedListener(listener)
        shopHost.navController.addOnDestinationChangedListener(listener)
        mineHost.navController.addOnDestinationChangedListener(listener)
        BehaviorReporter.report(
            isNewUser = false,
            "page_id" to "home",
        )
    }

    // ✅ 绑定全局路由埋点（四个 NavController）
    private fun bindGlobalRouteReporting() {
        homeHost.navController.addOnDestinationChangedListener(homeRouteListener)
        shopHost.navController.addOnDestinationChangedListener(shopRouteListener)
        mineHost.navController.addOnDestinationChangedListener(mineRouteListener)
        globalHost.navController.addOnDestinationChangedListener(globalRouteListener)

        // ✅ 删除：初始化手动上报（否则启动时会重复上报）
        // runCatching {
        //     currentTabNavController.currentDestination?.id?.let { reportPageView("init_current_tab", it) }
        //     globalNavController.currentDestination?.id?.let { reportPageView("init_global", it) }
        // }
    }

    private fun closeGlobalIfPossible(): Boolean {
        if (!isGlobalVisible()) return false

        val popped = globalNavController.popBackStack()

        // ✅ pop 后刷新一次（注意：currentDestination 可能要等一帧才更新，所以 post）
        bottomNav.post { updateBottomNavVisibility() }

        // popped = true 表示确实 pop 了；即使 popped=false 也可能已经在 empty 了
        return popped || !isGlobalVisible()
    }

    /**
     * ✅ 改这里：不要再用 View.visibility 判断 overlay
     * 以 NavController 的目的地为准
     */
    private fun isGlobalVisible(): Boolean {
        return globalNavController.currentDestination?.id != R.id.globalEmptyFragment
    }

    private fun setupBackPress() {
        onBackPressedDispatcher.addCallback(this, object : OnBackPressedCallback(true) {
            override fun handleOnBackPressed() {
                // 1) 优先关 global
                if (closeGlobalIfPossible()) return

                // 2) 再 pop 当前tab
                val popped = currentTabNavController.popBackStack()
                if (popped) {
                    bottomNav.post { updateBottomNavVisibility() }
                    return
                }

                // 3) 当前tab到根了：如果不是home，切回home；否则退出
                if (currentTabTag != TAB_HOME) {
                    bottomNav.post { bottomNav.selectedItemId = R.id.home_graph }
                    switchTab(TAB_HOME)
                } else {
                    finish()
                }
            }
        })
    }

    private var pendingNavigationAfterLogin: String? = null

    private fun handleNavigationFromIntent() {
        val navigateTo = intent.getStringExtra("navigate_to")
        if (navigateTo == "recharge_fragment") {
            bottomNav.post {
                if (!isLoggedIn()) {
                    pendingNavigationAfterLogin = navigateTo
                    openGlobal(R.id.loginFragment)
                    return@post
                }
                openGlobal(R.id.rechargeFragment)
            }
        }
        if (navigateTo == "login_fragment") {
            bottomNav.post {
                openGlobal(R.id.loginFragment)
            }
        }
    }

    private fun isLoggedIn(): Boolean {
        return EncryptedSharedPreferencesUtil.contains(this, "user")
    }

    override fun onSaveInstanceState(outState: Bundle) {
        outState.putString("current_tab_tag", currentTabTag)
        super.onSaveInstanceState(outState)
    }

    // =======================
    // 全局路由埋点：page_id 映射 + 上报
    // =======================

    private fun pageIdForDest(destId: Int): String {
        return when (destId) {
    
            /** ==================== 首页 Home ==================== */
            R.id.homeFragment -> "home_main"              // 首页-主页面
            R.id.keyboardDetailFragment -> "skin_detail" // 键盘详情页
            R.id.MyKeyboard -> "my_keyboard"              // 键盘设置
    
            /** ==================== 商城 Shop ==================== */
            R.id.shopFragment -> "shop"              // 商城首页
            R.id.searchFragment -> "search"          // 搜索页
            R.id.searchResultFragment -> "search_result"  // 搜索结果页
            R.id.MySkin -> "my_skin"                      // 我的皮肤
    
            /** ==================== 我的 Mine ==================== */
            R.id.mineFragment -> "my"            // 我的-首页
            R.id.PersonalSettings -> "person_info"  // 个人设置
            R.id.notificationFragment -> "notice"   // 消息通知
            R.id.feedbackFragment -> "feedback"           // 意见反馈
            R.id.consumptionRecordFragment -> "consumption_record" // 消费记录
    
            /** ==================== 登录 & 注册 ==================== */
            R.id.loginFragment -> "login"                 // 登录页
            R.id.registerFragment -> "register_email"           // 注册页
            R.id.registerVerifyFragment -> "register_verify_email" // 注册验证码
            R.id.forgetPasswordEmailFragment -> "forgot_password_email" // 忘记密码-邮箱
            R.id.forgetPasswordVerifyFragment -> "forgot_password_verify" // 忘记密码-验证码
            R.id.forgetPasswordResetFragment -> "forgot_password_newpwd" // 忘记密码-重置密码
    
            /** ==================== 充值相关 ==================== */
            R.id.rechargeFragment -> "vip_pay"            // 充值首页
            R.id.goldCoinRechargeFragment -> "points_recharge" // 金币充值
    
            /** ==================== 全局 / 占位 ==================== */
            R.id.globalEmptyFragment -> "global_empty"     // 全局占位页（兜底）
    
            /** ==================== 兜底处理 ==================== */
            else -> "unknown_$destId" // 未配置的页面，方便排查遗漏
        }
    }

    private fun reportPageView(source: String, destId: Int) {
        val pageId = pageIdForDest(destId)
        if (destId == R.id.globalEmptyFragment) return
        if (destId == R.id.loginFragment || destId == R.id.registerFragment){
            BehaviorReporter.report(
                isNewUser = true,
                "page_id" to pageId,
            )
            return
        }

        Log.d(ROUTE_TAG, "route: source=$source destId=$destId page_id=$pageId")

        BehaviorReporter.report(
            isNewUser = false,
            "page_id" to pageId,
        )
    }
}