package leakcanary.internal.activity.screen

import android.text.Html
import android.text.method.LinkMovementMethod
import android.view.ViewGroup
import android.widget.Switch
import android.widget.TextView
import com.squareup.leakcanary.core.BuildConfig
import com.squareup.leakcanary.core.R
import leakcanary.internal.HeapDumpControl
import leakcanary.internal.HeapDumpControl.ICanHazHeap.Nope
import leakcanary.internal.HeapDumpControl.ICanHazHeap.Yup
import leakcanary.internal.InternalLeakCanary
import leakcanary.internal.navigation.Screen
import leakcanary.internal.navigation.activity
import leakcanary.internal.navigation.inflate

internal class AboutScreen : Screen() {
  override fun createView(container: ViewGroup) =
    container.inflate(R.layout.leak_canary_about_screen)
      .apply {
        activity.title =
          resources.getString(R.string.leak_canary_about_title, BuildConfig.LIBRARY_VERSION)
        val aboutTextView = findViewById<TextView>(R.id.leak_canary_about_text)
        aboutTextView.movementMethod = LinkMovementMethod.getInstance()
        val application = activity.application
        val appName = application.packageManager.getApplicationLabel(application.applicationInfo)
        val appPackageName = context.packageName

        aboutTextView.text = Html.fromHtml(
          String.format(
            resources.getString(R.string.leak_canary_about_message), appName, appPackageName
          )
        )

        val heapDumpTextView = findViewById<TextView>(R.id.leak_canary_about_heap_dump_text)
        updateHeapDumpTextView(heapDumpTextView)
        val heapDumpSwitchView =
          findViewById<Switch>(R.id.leak_canary_about_heap_dump_switch_button)
        heapDumpSwitchView.isChecked = InternalLeakCanary.dumpEnabledInAboutScreen
        heapDumpSwitchView.setOnCheckedChangeListener { _, checked ->
          // Updating the value wouldn't normally immediately trigger a heap dump, however
          // by updating the view we also have a side effect of querying which will notify
          // the heap dumper if the value has become positive.
          InternalLeakCanary.dumpEnabledInAboutScreen = checked
          updateHeapDumpTextView(heapDumpTextView)
        }
      }

  private fun updateHeapDumpTextView(view: TextView) {
    view.text = when (val iCanHasHeap = HeapDumpControl.iCanHasHeap()) {
      is Yup -> view.resources.getString(R.string.leak_canary_heap_dump_enabled_text)
      is Nope -> view.resources.getString(
        R.string.leak_canary_heap_dump_disabled_text, iCanHasHeap.reason()
      )
    }
  }
}