assistant-android/app/src/main/java/com/gh/common/util/Extensions.kt

package com.gh.common.util

import android.content.ClipboardManager
import android.content.Context
import android.text.Html
import android.text.Spanned
import android.view.View
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentActivity
import androidx.lifecycle.*
import androidx.viewpager.widget.ViewPager
import com.google.gson.reflect.TypeToken
import com.halo.assistant.HaloApp
import com.lightgame.utils.Utils
import okhttp3.MediaType
import okhttp3.RequestBody
import java.net.URI

/**
 * 创建以 activity 为观察者上下文的 viewModel
 */
inline fun <reified VM : ViewModel> FragmentActivity.viewModelProvider(
        provider: ViewModelProvider.Factory? = null
) =
        ViewModelProviders.of(this, provider).get(VM::class.java)

/**
 * 创建以 activity 为观察者上下文的 viewModel
 */
inline fun <reified VM : ViewModel> Fragment.viewModelProviderFromParent(
        provider: ViewModelProvider.Factory? = null
) =
        ViewModelProviders.of(requireActivity(), provider).get(VM::class.java)

/**
 * 创建以 fragment 为观察者上下文的 viewModel
 */
inline fun <reified VM : ViewModel> Fragment.viewModelProvider(
        provider: ViewModelProvider.Factory? = null
) =
        ViewModelProviders.of(this, provider).get(VM::class.java)

/**
 *
 * ViewPager Extensions
 *
 */
fun ViewPager.doOnPageSelected(action: (position: Int) -> Unit) = addOnPageChangeListener(onSelected = action)

fun ViewPager.addOnPageChangeListener(onSelected: ((position: Int) -> Unit)? = null) {
    val listener = object : ViewPager.OnPageChangeListener {
        override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {
            // Do nothing.
        }

        override fun onPageSelected(position: Int) {
            onSelected?.invoke(position)
        }

        override fun onPageScrollStateChanged(state: Int) {
            // Do nothing.
        }
    }
    addOnPageChangeListener(listener)
}

/**
 * LiveData Extensions
 */
fun <T> LiveData<T?>.observeNonNull(owner: LifecycleOwner, callback: (T) -> Unit) {
    observe(owner, Observer { value ->
        if (value != null) {
            callback(value)
        }
    })
}

/**
 * Login related extensions
 */
fun Fragment.ifLogin(entrance: String, action: (() -> Unit)? = null) {
    requireContext().ifLogin(entrance, action)
}

fun Context.ifLogin(entrance: String, action: (() -> Unit)? = null) {
    CheckLoginUtils.checkLogin(this, entrance, action)
}


/**
 * Gson related extensions.
 */
inline fun <reified T : Any> String.toObject(): T? {
    return try {
        GsonUtils.gson.fromJson(this, object : TypeToken<T>() {}.type)
    } catch (e: Exception) {
        e.printStackTrace()
        null
    }
}

inline fun <reified T : Any> T.toJson(): String {
    return GsonUtils.toJson(this)
}

/**
 * 在限定 interval 里只触发一次 action
 */
fun debounceActionWithInterval(id: Int, interval: Long = 300, action: (() -> Unit)? = null) {
    if (!ClickUtils.isFastDoubleClick(id, interval)) {
        action?.invoke()
    }
}

fun View.debounceActionWithInterval(interval: Long = 300, action: (() -> Unit)? = null) {
    debounceActionWithInterval(this.id, interval, action)
}

/**
 * 告诉需要返回 true or false 的外层这个事件已经被消费（即返回 true）
 */
inline fun consume(f: () -> Unit): Boolean {
    f()
    return true
}

/**
 * 简化那些不得不写 try catch 的代码块
 */
inline fun tryWithDefaultCatch(action: (() -> Unit)) {
    try {
        action.invoke()
    } catch (e: Throwable) {
        e.printStackTrace()
    }
}

/**
 * String related
 */
fun String.fromHtml(): Spanned {
    return Html.fromHtml(this)
}

// 去掉文章/答案的插入内容
fun String.removeInsertedContent(): String {
    val textRegex = "(?s)<div class=\"gh-internal-content content-right\".*?</div>"

    return this.replace(textRegex.toRegex(), "")
}

// 完全地清除所有 Html 格式
fun String.clearHtmlFormatCompletely(): String {
    return Html.fromHtml(this).toString().replace('\n', 32.toChar())
            .replace(160.toChar(), 32.toChar()).replace(65532.toChar(), 32.toChar()).trim { it <= ' ' }
}

// 如果该字符串长度超过固定长度的话，从头开始截取固定长度并返回
fun String.subStringIfPossible(length: Int): String {
    return if (this.length > length) {
        this.substring(0, length)
    } else {
        this
    }
}

fun String.copyTextAndToast(toastText: String = "复制成功") {
    val application = HaloApp.getInstance().application
    val cmb = application.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
    cmb.text = this
    Utils.toast(application, toastText)
}

fun Map<String, String>.createRequestBody(): RequestBody {
    val json = GsonUtils.toJson(this)
    return RequestBody.create(MediaType.parse("application/json"), json)
}

// 对在浏览器(WebView)显示的路径进行转码
fun String.decodeURI(): String {
    return URI(null, null, this, null).rawPath
}

/**
 * 根据手机的分辨率从 dip(像素) 的单位 转成为 px
 */
fun Float.dip2px(): Int {
    val scale = HaloApp.getInstance().application.resources.displayMetrics.density
    return (this * scale + 0.5f).toInt()
}