SubwayTooter-Android-App/app/src/main/java/jp/juggler/subwaytooter/dialog/LoginForm.kt

package jp.juggler.subwaytooter.dialog

import android.annotation.SuppressLint
import android.app.Activity
import android.app.Dialog
import android.support.annotation.StringRes
import android.text.InputType
import android.view.View
import android.view.WindowManager
import android.view.inputmethod.EditorInfo
import android.widget.*
import jp.juggler.subwaytooter.R
import jp.juggler.util.LogCategory
import jp.juggler.util.showToast
import java.io.BufferedReader
import java.io.InputStreamReader
import java.util.*

object LoginForm {
	private val log = LogCategory("LoginForm")
	
	private class StringArray : ArrayList<String>()
	
	enum class Action(
		val pos : Int,
		@StringRes val idName : Int,
		@StringRes val idDesc : Int
	) {
		
		Existing(0, R.string.existing_account, R.string.existing_account_desc),
		Pseudo(1, R.string.pseudo_account, R.string.pseudo_account_desc),
		Create(2, R.string.create_account, R.string.create_account_desc),
		Token(3, R.string.input_access_token, R.string.input_access_token_desc),
	}
	
	@SuppressLint("InflateParams")
	fun showLoginForm(
		activity : Activity,
		instanceArg : String?,
		onClickOk : (
			dialog : Dialog,
			instance : String,
			action : Action
		) -> Unit
	) {
		val view = activity.layoutInflater.inflate(R.layout.dlg_account_add, null, false)
		val etInstance : AutoCompleteTextView = view.findViewById(R.id.etInstance)
		val btnOk : View = view.findViewById(R.id.btnOk)
		
		val tvActionDesc : TextView = view.findViewById(R.id.tvActionDesc)
		
		fun Spinner.getActionDesc() : String =
			Action.values()
				.find { it.pos == selectedItemPosition }
				?.let { activity.getString(it.idDesc) }
				?: "(null)"
		
		val spAction = view.findViewById<Spinner>(R.id.spAction).also { sp ->
			sp.adapter = ArrayAdapter(
				activity,
				android.R.layout.simple_spinner_item,
				Action.values().map { activity.getString(it.idName) }.toTypedArray()
			).apply {
				setDropDownViewResource(R.layout.lv_spinner_dropdown)
				
			}
			sp.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
				override fun onNothingSelected(parent : AdapterView<*>?) { // TODO
					tvActionDesc.text = sp.getActionDesc()
				}
				
				override fun onItemSelected(
					parent : AdapterView<*>?,
					view : View?,
					position : Int,
					id : Long
				) {
					tvActionDesc.text = sp.getActionDesc()
				}
			}
		}
		
		tvActionDesc.text = spAction.getActionDesc()
		
		if(instanceArg != null && instanceArg.isNotEmpty()) {
			etInstance.setText(instanceArg)
			etInstance.inputType = InputType.TYPE_NULL
			etInstance.isEnabled = false
			etInstance.isFocusable = false
		} else {
			etInstance.setOnEditorActionListener(TextView.OnEditorActionListener { _, actionId, _ ->
				if(actionId == EditorInfo.IME_ACTION_DONE) {
					btnOk.performClick()
					return@OnEditorActionListener true
				}
				false
			})
		}
		val dialog = Dialog(activity)
		dialog.setContentView(view)
		// 警告がでるが、パラメータ名の指定を削ってはいけない
		btnOk.setOnClickListener { _ ->
			val instance = etInstance.text.toString().trim { it <= ' ' }
			
			when {
				
				instance.isEmpty() ->
					showToast(activity, true, R.string.instance_not_specified)
				
				instance.contains("/") || instance.contains("@") ->
					showToast(activity, true, R.string.instance_not_need_slash)
				
				else -> {
					val actionPos = spAction.selectedItemPosition
					when(val action = Action.values().find { it.pos == actionPos }) {
						null -> {
						} // will no happened
						else -> onClickOk(dialog, instance, action)
					}
				}
			}
		}
		view.findViewById<View>(R.id.btnCancel).setOnClickListener { dialog.cancel() }
		
		val instance_list = ArrayList<String>()
		try {
			activity.resources.openRawResource(R.raw.server_list).use { inStream ->
				val br = BufferedReader(InputStreamReader(inStream, "UTF-8"))
				while(true) {
					val s : String = br.readLine()?.trim { it <= ' ' }?.toLowerCase() ?: break
					if(s.isNotEmpty()) instance_list.add(s)
				}
			}
		} catch(ex : Throwable) {
			log.trace(ex)
		}
		
		val adapter = object : ArrayAdapter<String>(
			activity, R.layout.lv_spinner_dropdown, ArrayList()
		) {
			
			val nameFilter : Filter = object : Filter() {
				override fun convertResultToString(value : Any) : CharSequence {
					return value as String
				}
				
				override fun performFiltering(constraint : CharSequence?) : Filter.FilterResults {
					val result = Filter.FilterResults()
					if(constraint?.isNotEmpty() == true) {
						val key = constraint.toString().toLowerCase()
						// suggestions リストは毎回生成する必要がある。publishResultsと同時にアクセスされる場合がある
						val suggestions = StringArray()
						for(s in instance_list) {
							if(s.contains(key)) {
								suggestions.add(s)
								if(suggestions.size >= 20) break
							}
						}
						result.values = suggestions
						result.count = suggestions.size
					}
					return result
				}
				
				override fun publishResults(
					constraint : CharSequence?,
					results : Filter.FilterResults?
				) {
					clear()
					val values = results?.values
					if(values is StringArray) {
						for(s in values) {
							add(s)
						}
					}
					notifyDataSetChanged()
				}
			}
			
			override fun getFilter() : Filter {
				return nameFilter
			}
		}
		adapter.setDropDownViewResource(R.layout.lv_spinner_dropdown)
		etInstance.setAdapter<ArrayAdapter<String>>(adapter)
		
		
		dialog.window?.setLayout(
			WindowManager.LayoutParams.MATCH_PARENT,
			WindowManager.LayoutParams.WRAP_CONTENT
		)
		dialog.show()
	}
	
}