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

package com.gyf.csams.uikit

import android.app.Application
import androidx.compose.material.SnackbarDuration
import androidx.compose.ui.graphics.ImageBitmap
import androidx.lifecycle.*
import com.google.gson.reflect.TypeToken
import com.gyf.csams.R
import com.gyf.csams.util.HttpClient
import com.gyf.csams.util.ImageUtil
import com.gyf.csams.util.SimpleCallback
import com.orhanobut.logger.Logger
import kotlinx.coroutines.Job
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch

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)
        }
    }
}


class ImageModel(application: Application, private val urlPath: String) :
    AndroidViewModel(application) {
    private val _image = MutableLiveData<ImageBitmap>()
    private val _imageUrls = MutableLiveData<List<String>>()
    val image: LiveData<ImageBitmap> = _image
    private var job: Job? = null

    /**
     * 加载默认图片
     *
     */
    private fun defaultLoad() {
        viewModelScope.launch {
            _image.postValue(
                ImageUtil.getImage(
                    getApplication(),
                    R.drawable.ic_launcher_foreground
                )
            )
        }
    }

    /**
     * 循环加载网络图片
     *
     */
    fun start() {
        Logger.i("启动轮播")
        if (job == null || job?.isCompleted == true || job?.isCancelled == true) {
            job = viewModelScope.launch {
                HttpClient.get(
                    url = urlPath,
                    SimpleCallback<List<String>>("请求图片url列表", onSuccess = {
                        _imageUrls.postValue(it.body)
                        var index = 0
                        _imageUrls.value?.apply {
                            viewModelScope.launch {
                                do {
                                    val imageBitmap =
                                        ImageUtil.getImage(
                                            context = getApplication(),
                                            data = get(index)
                                        )
                                    Logger.e("成功从image url:${get(index)}解析图片")
                                    _image.postValue(imageBitmap)
                                    delay(5000)
                                    index = if (index == size - 1) 0 else index.plus(1)
                                } while (job?.isActive == true)
                            }
                        }
                    }, onFail = {
                        Logger.e("无法从接口地址：${urlPath}获取图片url列表")
                        defaultLoad()
                    }, type = object : TypeToken<List<String>>() {}.type)
                )
            }.apply {
                start()
            }
        }
    }

    fun cancel() {
        Logger.i("停止轮播")
        job?.cancel()
    }
}

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)
}