rider-pro-android-app/app/src/main/java/com/aiosman/riderpro/MainActivity.kt

package com.aiosman.riderpro

import ModificationListScreen
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.animation.core.tween
import androidx.compose.animation.fadeIn
import androidx.compose.animation.fadeOut
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.navigationBars
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.statusBarsPadding
import androidx.compose.material3.Icon
import androidx.compose.material3.NavigationBar
import androidx.compose.material3.NavigationBarItem
import androidx.compose.material3.NavigationBarItemColors
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Surface
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.compositionLocalOf
import androidx.compose.runtime.getValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.core.view.WindowCompat
import androidx.navigation.NavHostController
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.currentBackStackEntryAsState
import androidx.navigation.compose.rememberNavController
import com.aiosman.riderpro.ui.theme.RiderProTheme
import com.google.accompanist.systemuicontroller.rememberSystemUiController


class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        WindowCompat.setDecorFitsSystemWindows(window, false)

        enableEdgeToEdge()
        setContent {
            Navigation()
        }
    }
}

val LocalNavController = compositionLocalOf<NavHostController> {
    error("NavController not provided")
}

@Composable
fun NavigationController(navController: NavHostController) {
    val navigationBarHeight = with(LocalDensity.current) {
        WindowInsets.navigationBars.getBottom(this).toDp()
    }
    NavHost(
        navController = navController,
        startDestination = NavigationItem.Home.route,
        enterTransition = {
            fadeIn(animationSpec = tween(0))
        },
        exitTransition = {
            fadeOut(animationSpec = tween(0))
        }) {
        // 带底部导航栏的路由：
        listOf(
            NavigationItem.Home,
            NavigationItem.Street,
            NavigationItem.Add,
            NavigationItem.Message,
            NavigationItem.Profile
        ).forEach { item ->
            composable(route = item.route) {
                ScaffoldWithNavigationBar(navController) {
                    when (item) {
                        NavigationItem.Home -> Home()
                        NavigationItem.Street -> Street()
                        NavigationItem.Add -> Add()
                        NavigationItem.Message -> Video()
                        NavigationItem.Profile -> Profile()
                        else -> {} // 由于过滤，这里不会发生
                    }
                }
            }
        }
        composable(route = "ProfileTimeline") {
            GalleryPage()
        }
        composable(route = "LocationDetail") {
            Box(
                modifier = Modifier.padding(bottom = navigationBarHeight)
            ) {
                LocationDetail()
            }
        }
        composable(route = "OfficialPhoto") {
            Box(
                modifier = Modifier.padding(bottom = navigationBarHeight)
            ) {
                OfficialGalleryPage()
            }
        }
        composable(route = "OfficialPhotographer") {
            OfficialPhotographer()
        }
        composable(route = "Post") {
            Box(
                modifier = Modifier.padding(bottom = navigationBarHeight)
            ) {
                PostPage()
            }
        }
        composable(route = "ModificationList") {
            Box(
                modifier = Modifier.padding(bottom = navigationBarHeight)
            ) {
                ModificationListScreen()
            }
        }
        composable(route = "MyMessage") {
            Box(
                modifier = Modifier.padding(bottom = navigationBarHeight)
            ) {
                NotificationsScreen()
            }
        }
        composable(route = "Comments") {
            Box(
                modifier = Modifier.padding(navigationBarHeight)
            ) {
                CommentsScreen()
            }
        }
        composable(route = "Likes") {
            Box(
                modifier = Modifier.padding(navigationBarHeight)
            ) {
                LikePage()
            }
        }
        composable(route = "Followers") {
            Box(
                modifier = Modifier.padding(navigationBarHeight)
            ) {
                FollowerPage()
            }
        }
        composable(route = "NewPost") {
            Box(
                modifier = Modifier.padding(navigationBarHeight, top = 64.dp)
            ) {
                NewPostScreen()
            }
        }
        composable(route = "EditModification") {
            Box(
                modifier = Modifier.padding(top = 64.dp)
            ) {
                EditModification()
            }
        }
    }
}

@Composable
fun Navigation() {
    val navController = rememberNavController()
    CompositionLocalProvider(LocalNavController provides navController) {
        Box {
            NavigationController(navController = navController)
        }
    }
}

// 用于带导航栏的路由的可复用 composable
@Composable
fun ScaffoldWithNavigationBar(
    navController: NavHostController,
    content: @Composable () -> Unit
) {
    val navigationBarHeight = with(LocalDensity.current) {
        WindowInsets.navigationBars.getBottom(this).toDp()
    }
    val item = listOf(
        NavigationItem.Home,
        NavigationItem.Street,
        NavigationItem.Add,
        NavigationItem.Message,
        NavigationItem.Profile
    )
    Scaffold(
        modifier = Modifier.statusBarsPadding(),
        bottomBar = {
            NavigationBar(
                modifier = Modifier.height(56.dp + navigationBarHeight),
                containerColor = Color.Black
            ) {
                val navBackStackEntry by navController.currentBackStackEntryAsState()
                val currentRoute = navBackStackEntry?.destination?.route
                val systemUiController = rememberSystemUiController()
                item.forEach { it ->
                    NavigationBarItem(
                        selected = currentRoute == it.route,
                        onClick = {
                            if (currentRoute != it.route) {
                                navController.navigate(it.route)
                            }
                            when (it.route) {
                                NavigationItem.Add.route -> {
                                    systemUiController.setSystemBarsColor(
                                        color = Color.Black
                                    )
                                }

                                NavigationItem.Message.route -> {
                                    systemUiController.setSystemBarsColor(
                                        color = Color.Black
                                    )
                                }

                                else -> {
                                    systemUiController.setSystemBarsColor(
                                        color = Color.Transparent
                                    )
                                }
                            }
                        },
                        colors = NavigationBarItemColors(
                            selectedIconColor = Color.Red,
                            selectedTextColor = Color.Red,
                            selectedIndicatorColor = Color.Black,
                            unselectedIconColor = Color.Red,
                            unselectedTextColor = Color.Red,
                            disabledIconColor = Color.Red,
                            disabledTextColor = Color.Red,

                            ),
                        icon = {
                            Icon(
                                modifier = Modifier.size(24.dp),
                                imageVector = it.icon(), contentDescription = null,
                                tint = if (currentRoute == it.route) Color.Red else Color.White
                            )
                        }
                    )
                }

            }
        }
    ) { innerPadding ->
        Box(
            modifier = Modifier.padding(innerPadding)
        ) {
            content()
        }
    }
}

@Composable
fun Home() {
    val navigationBarHeight = with(LocalDensity.current) {
        WindowInsets.navigationBars.getBottom(this).toDp()
    }
    Column(
        modifier = Modifier
            .fillMaxSize(),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        PagingBackendSample()
    }
}


@Composable
fun Street() {
    val navigationBarHeight = with(LocalDensity.current) {
        WindowInsets.navigationBars.getBottom(this).toDp()
    }
    Column(
        modifier = Modifier
            .fillMaxSize(),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        StreetPage()
    }
}

@Composable
fun Add() {
    val navigationBarHeight = with(LocalDensity.current) {
        WindowInsets.navigationBars.getBottom(this).toDp()
    }
    Column(
        modifier = Modifier
            .fillMaxSize()
            .background(Color.Black),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        AddPage()
    }
}

@Composable
fun Video() {
    val navigationBarHeight = with(LocalDensity.current) {
        WindowInsets.navigationBars.getBottom(this).toDp()
    }
    Column(
        modifier = Modifier
            .fillMaxSize(),
        verticalArrangement = Arrangement.Top,
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        ShortVideo()
    }
}

@Composable
fun Message() {
    val navigationBarHeight = with(LocalDensity.current) {
        WindowInsets.navigationBars.getBottom(this).toDp()
    }
    Column(
        modifier = Modifier
            .fillMaxSize(),
        verticalArrangement = Arrangement.Top,
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        MessagePage()
    }
}

@Composable
fun Profile() {
    val navigationBarHeight = with(LocalDensity.current) {
        WindowInsets.navigationBars.getBottom(this).toDp()
    }
    Column(
        modifier = Modifier
            .fillMaxSize(),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        ProfilePage()
    }
}


@Preview(showBackground = true)
@Composable
fun GreetingPreview() {
    RiderProTheme {
        Surface(modifier = Modifier.fillMaxSize(), color = Color.White) {
            Navigation()
        }
    }
}