/**
 * Designed and developed by Aidan Follestad (@afollestad)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.afollestad.materialdialogs.color.view

import android.content.Context
import android.os.Build
import android.util.AttributeSet
import android.widget.SeekBar
import androidx.appcompat.widget.AppCompatSeekBar

typealias ProgressListener = ((Int) -> Unit)?

/** @author Aidan Follestad (@afollestad) */
class ObservableSeekBar(
  context: Context,
  attrs: AttributeSet? = null
) : AppCompatSeekBar(context, attrs) {

  private var listener: ProgressListener = null
  private var paused: Boolean = false
  private var onlyFromUser: Boolean = false

  override fun onAttachedToWindow() {
    super.onAttachedToWindow()
    setOnSeekBarChangeListener(watcher)
  }

  override fun onDetachedFromWindow() {
    setOnSeekBarChangeListener(null)
    super.onDetachedFromWindow()
  }

  fun observe(
    onlyFromUser: Boolean = true,
    listener: ProgressListener
  ) {
    this.onlyFromUser = onlyFromUser
    this.listener = listener
  }

  fun updateProgress(
    progress: Int,
    animate: Boolean = false
  ) {
    paused = true
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
      setProgress(progress, animate)
    } else {
      setProgress(progress)
    }
  }

  private val watcher = object : OnSeekBarChangeListener {
    override fun onProgressChanged(
      seekBar: SeekBar,
      progress: Int,
      fromUser: Boolean
    ) {
      if (!onlyFromUser || fromUser) {
        listener?.invoke(progress)
      }
      paused = false
    }

    override fun onStartTrackingTouch(seekBar: SeekBar?) = Unit

    override fun onStopTrackingTouch(seekBar: SeekBar?) = Unit
  }
}
