csamsclient/app/src/main/java/com/gyf/csams/uikit/ViewModel.kt

package com.gyf.csams.uikit

import androidx.compose.material.SnackbarDuration
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import com.orhanobut.logger.Logger

interface FormLength{
    val nameLengthError:String
}

abstract class FormName<T>(val formDesc:String){
    protected val _formValue= MutableLiveData<T>()
    val formValue: LiveData<T> = _formValue
    val formPlaceholder="请输入$formDesc"

    abstract fun onChange(value:T)


}

/**
 * 文本输入框控制
 *
 * @property textLength
 * @constructor
 *
 * @param formDesc
 */
open class StringForm(formDesc: String, val textLength: Int) : FormName<String>(formDesc = formDesc),
    FormLength {

    constructor(formDesc: String,textLength: Int,value:String) : this(formDesc = formDesc,textLength = textLength) {
        _formValue.value=value
    }

    override val nameLengthError="${formDesc}不能超过最大长度$textLength"

    override fun onChange(value: String) {
        if(value.length>textLength){
            _formValue.value=value.slice(IntRange(0,textLength-1))
        }else{
            _formValue.value=value
        }
        Logger.i("${formDesc}更新值：${_formValue.value}")
    }
}


data class SnackBar(val message:String?, val actionLabel:String?=null,val duration: SnackbarDuration=SnackbarDuration.Short, val callback: () -> Unit?)

/**
 * snackbar
 *
 */
class ScaffoldModel:ViewModel(){
    private val _data=MutableLiveData<SnackBar>()
    val data:LiveData<SnackBar> = _data

    fun update(message:String?=null,actionLabel: String? = null,callback: () -> Unit? =  {}){
        if(message==null){
            _data.value=null
        }else {
            _data.value = SnackBar(message = message, actionLabel = actionLabel,callback = callback)
        }
    }
}

abstract class ScrollList<T>:ViewModel(){
    protected val _data=MutableLiveData<MutableList<T>>(mutableListOf())
    val data:LiveData<MutableList<T>> = _data

    abstract val initSize:Int

    //加载列表
    abstract fun load()
    //加载更多数据
    abstract fun loadMore(callback:(message:String) -> Unit)
}