feat: dining hall crowdedness feature [WIP]

app/src/main/java/com/fduhole/danxinative/base/feature/FudanDiningHallCrowdednessFeature.kt

@@ -0,0 +1,60 @@
+package com.fduhole.danxinative.base.feature
+
+import com.fduhole.danxinative.base.Feature
+import com.fduhole.danxinative.R
+import com.fduhole.danxinative.model.DiningInfoItem
+import com.fduhole.danxinative.repository.fdu.DatacenterRepository
+import com.fduhole.danxinative.util.UnsuitableTimeException
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.launch
+import org.koin.core.component.KoinComponent
+import org.koin.core.component.inject
+import java.util.*
+
+class FudanDiningHallCrowdednessFeature : Feature(), KoinComponent {
+    enum class Status {
+        IDLE, LOADING, LOADED, UNSUITABLE, FAILED, ERROR
+    }
+
+    private val repo: DatacenterRepository by inject()
+
+    private var subTitleContent = ""
+    private var status: Status = Status.IDLE
+    private var loadingJob: Job? = null
+    private var trafficInfo: List<DiningInfoItem>? = null
+    private var mostCrowded: DiningInfoItem? = null
+    private var leastCrowded: DiningInfoItem? = null
+
+    override fun getClickable(): Boolean = true
+    override fun getIconId(): Int = R.drawable.ic_baseline_forum_24
+    override fun getTitle(): String = "食堂排队消费状况"
+    override fun getSubTitle(): String = when (status) {
+        Status.IDLE -> "轻触以查看"
+        Status.FAILED -> "加载失败"
+        Status.ERROR -> "发生错误，轻触重试"
+        Status.LOADING -> "加载中"
+        Status.UNSUITABLE -> "现在不是用餐时间"
+        Status.LOADED -> subTitleContent
+    }
+
+    override fun onClick() {
+        loadingJob?.cancel()
+        when (status) {
+            Status.IDLE,
+            Status.FAILED,
+            Status.ERROR,
+            Status.UNSUITABLE -> {
+                loadingJob = featureScope.launch {
+                    try {
+                        trafficInfo = trafficInfo ?: repo.getCrowdednessInfo(0)
+                        status = Status.LOADED
+                    }
+                    catch (e: UnsuitableTimeException) { status = Status.UNSUITABLE }
+                    catch (e: Throwable) { status = Status.ERROR }
+                    notifyRefresh()
+                }
+            }
+            else -> {}
+        }
+    }
+}

app/src/main/java/com/fduhole/danxinative/model/DiningInfo.kt

@@ -0,0 +1,6 @@
+package com.fduhole.danxinative.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class DiningInfoItem(val name: String, val current: Int, val highest: Int)

app/src/main/java/com/fduhole/danxinative/repository/fdu/DatacenterRepository.kt

@@ -0,0 +1,56 @@
+package com.fduhole.danxinative.repository.fdu
+
+import com.fduhole.danxinative.model.DiningInfoItem
+import com.fduhole.danxinative.util.DataUtils
+import com.fduhole.danxinative.util.UnsuitableTimeException
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlinx.coroutines.withContext
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import okhttp3.Request
+import kotlin.coroutines.resume
+
+class DatacenterRepository : BaseFDURepository() {
+    companion object {
+        const val DINING_DETAIL_URL = "https://my.fudan.edu.cn/simple_list/stqk"
+        const val DINING_HALL_CLOSING_NOTICE = "本功能仅在用餐时段开放"
+        const val DATA = "initChart('chart_bb', ['光华楼\\n光华咖啡','光华楼-光华咖啡(学府餐饮)','光华楼-光华咖啡(学校餐饮)','北区食堂-北区二楼德保','北区\\n千喜鹤','北区\\n新世纪早餐','北区食堂-北区新世纪早餐(高校)','北区\\n清真','北区食堂-北区清真(伊源)','北区\\n西餐厅','北区食堂-北区西餐厅(乐烹西东)','北区\\n面包房','北区食堂-北区面包房(东兴鼎昊)','北区\\n颐谷','南区\\n一楼同茂兴','南区\\n中快餐饮','南区\\n清真','南区食堂-南区清真(伊源)','南区\\n南苑餐厅','南区食堂-南苑餐厅(东大)','南区\\n同茂兴','南区\\n教工快餐','南区食堂-教工快餐(东大)','文图咖啡馆','旦苑\\n清真','旦苑\\n一楼大厅','旦苑\\n教授餐厅','旦苑\\n二楼大厅','旦苑\\n面包房','旦苑-本部学校面包房(学校餐饮)','旦苑-本部西餐厅(乐烹西东)','旦苑\\n西餐厅'],\n['0','0','0','0','0','0','9','0','0','0','2','0','3','1','3','0','0','0','0','0','0','0','0','0','0','7','0','0','0','2','0','0'],\n['5','2','2','77','118','79','66','45','36','54','30','52','21','134','167','51','49','36','100','74','113','171','109','10','79','232','44','167','75','57','35','46'])\ninitChart('chart_fl', ['书院楼西园餐厅','书院楼西园餐厅(养吉)','书院楼风味餐厅','书院楼风味餐厅(颐谷)','护理学院','枫林清真餐厅-枫林清真餐厅','枫林清真餐厅-枫林清真餐厅(伊源)','枫林食堂-枫林一楼科桥'],\n['0','0','0','5','0','0','0','1'],\n['49','26','167','107','37','60','49','144'])\ninitChart('chart_jw', ['一楼中快','二楼颐谷','清真','清真(伊源)','点心','点心(中快)','花园餐厅','花园餐厅(雷汇柏祺)'],\n['13','0','0','1','0','1','0','0'],\n['209','133','46','40','39','29','10','1'])\ninitChart('chart_zj', ['一餐二楼教师','一餐二楼自选','一餐二楼风味','一楼中快','佳乐餐饮','清真','清真(伊源)'],\n['0','0','0','0','0','0','0'],\n['22','41','23','67','29','32','26'])\n"
+    }
+
+    suspend fun getCrowdednessInfo(areaCode: Int) = withContext(Dispatchers.IO) {
+        suspendCancellableCoroutine {
+            val response = client.newCall(
+                Request.Builder()
+                    .url(DINING_DETAIL_URL).get()
+                    .build()
+            ).execute()
+            val data = response.body!!.string()
+            if (data.contains(DINING_HALL_CLOSING_NOTICE)) {
+                throw UnsuitableTimeException()
+            }
+
+            val begin = data.indexOf("initChart('")
+            val end = data.lastIndexOf("</script>")
+
+            val chartData = data.substring(begin, end).replace("'", "\"")
+            // val chartData = DATA.replace("'", "\"")
+
+            val jsonExtraction = "\\[.+\\]".toRegex().findAll(chartData)
+            val names = Json.decodeFromString<List<String>>(
+                jsonExtraction.elementAt(areaCode * 3).groups[0]!!.value)
+            val currentData = Json.decodeFromString<List<Int>>(
+                jsonExtraction.elementAt(areaCode * 3 + 1).groups[0]!!.value)
+            val highestData = Json.decodeFromString<List<Int>>(
+                jsonExtraction.elementAt(areaCode * 3 + 2).groups[0]!!.value)
+
+            val datas = DataUtils.zipToTriple(names, currentData, highestData)
+            it.resume(datas.map { it -> DiningInfoItem(it.first, it.second, it.third) })
+        }
+    }
+
+    override fun getHost(): String = "my.fudan.edu.cn"
+
+    override fun getUISLoginURL(): String =
+        "https://uis.fudan.edu.cn/authserver/login?service=https%3A%2F%2Fmy.fudan.edu.cn%2Fsimple_list%2Fstqk";
+}

app/src/main/java/com/fduhole/danxinative/state/GlobalState.kt

@@ -20,6 +20,7 @@ val appModule = module {
     single { FDUHoleRepository() }
     single { AAORepository() }
     single { LibraryRepository() }
+    single { DatacenterRepository() }
 }
 
 class GlobalState constructor(private val sp: SharedPreferences) {

app/src/main/java/com/fduhole/danxinative/ui/HomeViewModel.kt

@@ -4,6 +4,7 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.fduhole.danxinative.base.feature.FudanAAONoticesFeature
 import com.fduhole.danxinative.base.feature.FudanDailyFeature
+import com.fduhole.danxinative.base.feature.FudanDiningHallCrowdednessFeature
 import com.fduhole.danxinative.base.feature.FudanLibraryAttendanceFeature
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
@@ -18,7 +19,8 @@ class HomeViewModel : ViewModel() {
         _uiState.emit(HomeUiState(listOf(
             FudanDailyFeature(),
             FudanAAONoticesFeature(),
-            FudanLibraryAttendanceFeature()
+            FudanLibraryAttendanceFeature(),
+            FudanDiningHallCrowdednessFeature()
         )))
     }
 

app/src/main/java/com/fduhole/danxinative/util/DataUtils.kt

@@ -0,0 +1,16 @@
+package com.fduhole.danxinative.util
+
+object DataUtils {
+    fun <T, U, V> zipToTriple(first: List<T>, second: List<U>, third: List<V>)
+    : List<Triple<T, U, V>> {
+        val minSize =
+            if (first.size <= second.size && first.size <= third.size) first.size
+            else if (second.size <= first.size && second.size <= third.size) second.size
+            else third.size
+        val list = ArrayList<Triple<T, U, V>>(minSize)
+        for (i in 0 until minSize) {
+            list.add(Triple(first[i], second[i], third[i]))
+        }
+        return list
+    }
+}

app/src/main/java/com/fduhole/danxinative/util/ErrorUtils.kt

@@ -11,6 +11,12 @@ abstract class ExplainableException : Exception() {
     abstract fun explain(context: Resources): String
 }
 
+/**
+ * UnsuitableTimeException is related to Dining Crowdedness.
+ */
+class UnsuitableTimeException : Exception() {
+}
+
 class ErrorUtils {
     companion object {
         fun describeError(context: Context, error: Throwable): String = describeError(context.resources, error)