csamsclient/foreground/src/main/java/com/gyf/csams/message/model/SysMessageViewModel.kt

package com.gyf.csams.message.model

import androidx.lifecycle.viewModelScope
import com.gyf.csams.NOT_IMPL_TIP
import com.gyf.csams.uikit.ScrollList
import com.gyf.csams.util.randomChinese
import com.gyf.csams.util.randomDateTime
import com.gyf.csams.util.randomNum
import kotlinx.coroutines.launch
import java.util.*
import kotlin.random.Random

enum class SystemType(val desc: String) {
    Join("入团通知"),
    ActCheck("活动审核通知"),
    Rename("社团重命名审核通知")
}

/**
 * 通知内容
 *
 */
sealed class MessageContent {
    //通知时间
    abstract val createTime: Date

    //通知状态
    abstract val readState: Boolean

    //通知类型
    abstract val type: SystemType
}

/**
 * 入团通知
 * @param studentId 学号
 * @param studentName 姓名
 *
 */
data class JoinContent(
    val studentId: Long,
    val studentName: String,
    override val createTime: Date,
    override val readState: Boolean,
    override val type: SystemType = SystemType.Join
) : MessageContent()

/**
 * 活动审核通知
 *
 * @property activityId 活动id
 * @property activityName 活动名
 *
 */
data class ActCheckContent(
    val activityId: Long, val activityName: String,
    override val createTime: Date,
    override val readState: Boolean,
    override val type: SystemType = SystemType.ActCheck
) : MessageContent()

/**
 * 社团重命名审核通知
 *
 * @property oldAssociationName 老社团名字
 * @property newAssociationName 新社团名字
 *
 */
data class RenameContent(
    val oldAssociationName: String, val newAssociationName: String,
    override val createTime: Date,
    override val readState: Boolean,
    override val type: SystemType = SystemType.Rename
) : MessageContent()

/**
 * 系统通知数据状态管理
 *
 */
class SysMessageViewModel : ScrollList<MessageContent>() {
    val title = "系统通知"

    override val initSize: Int = 10

    init {
        load()
    }

    /**
     * TODO 加载通知
     *
     */
    override fun load() {
        viewModelScope.launch {
            _data.value?.apply {
                repeat(initSize) {
                    when ((0..2).random()) {
                        0 -> add(
                            JoinContent(
                                createTime = randomDateTime(),
                                readState = Random.nextBoolean(),
                                studentId = randomNum().toLong(),
                                studentName = randomChinese(5)
                            )
                        )
                        1 -> add(
                            ActCheckContent(
                                activityId = randomNum().toLong(),
                                activityName = randomChinese(5),
                                createTime = randomDateTime(),
                                readState = Random.nextBoolean()
                            )
                        )
                        2 -> add(
                            RenameContent(
                                oldAssociationName = randomChinese(3),
                                newAssociationName = randomChinese(3),
                                createTime = randomDateTime(),
                                readState = Random.nextBoolean()
                            )
                        )
                    }
                }
            }
        }
    }

    /**
     * TODO 加载更多通知
     *
     * @param callback
     */
    override fun loadMore(callback: (message: String) -> Unit) {
        callback(NOT_IMPL_TIP)
    }
}