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package com.pitchedapps.frost.injectors
import android.webkit.WebView
/**
* Created by Allan Wang on 2017-05-31.
*/
enum class JsActions(val function: String) {
HIDE("style.display='none'"),
REMOVE("remove()")
}
class VariableGenerator {
var count = 0
val next: String
get() {
var key = count
count++
if (key == 0) return "a"
val name = StringBuilder()
while (key > 0) {
name.append(((key % 26) + 'a'.toInt()).toChar())
key /= 26
}
return name.toString()
}
fun reset() {
count = 0
}
}
class JsBuilder {
private val map: MutableMap<String, MutableSet<JsActions>> = mutableMapOf()
private val v = VariableGenerator()
private val css: StringBuilder by lazy { StringBuilder() }
fun append(action: JsActions, vararg ids: String): JsBuilder {
ids.forEach { id -> map[id]?.add(action) ?: map.put(id, mutableSetOf(action)) }
return this
}
fun css(css: String): JsBuilder {
this.css.append(css.trim())
return this
}
fun build() = JsInjector(toString())
override fun toString(): String {
v.reset()
val builder = StringBuilder().append("!function(){")
map.forEach { id, actions ->
if (actions.size == 1) {
builder.append("document.getElementById('$id').${actions.first().function};")
} else {
val name = v.next
builder.append("var $name=document.getElementById('$id');")
actions.forEach { a -> builder.append("$name.${a.function};") }
}
}
if (css.isNotBlank()) {
val name = v.next
builder.append("var $name=document.createElement('style');$name.innerHTML='$css';document.head.appendChild($name);")
}
return builder.append("}()").toString()
}
}
class JsInjector(val function: String) {
fun inject(webView: WebView, callback: ((String) -> Unit)? = null) {
webView.evaluateJavascript(function, { value -> callback?.invoke(value) })
}
}
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