package com.unitreactnativecomponents.nativeComponents.visapresentation

import android.content.Context
import android.content.res.Configuration
import android.util.AttributeSet
import android.view.LayoutInflater
import android.widget.RelativeLayout
import com.unitreactnativecomponents.R

/**
 * This theme enum outlines the background color of your activity
 */
enum class UNGooglePayButtonTheme {
  Dark,
  Colorful,
  Light,
}

/**
 * This style enum outlines the desired style for your button(Outlined can be applied only with a 'Dark' or 'Colorful' theme)
 */
enum class UNGooglePayButtonStyle {
  Regular,
  Outlined,
}

/**
 * A class that was created to make Google's branding review implementation easier for Unit customers.
 */

class UNGooglePayView @JvmOverloads constructor(
  context: Context,
  attrs: AttributeSet? = null,
  defStyleAttr: Int = 0,
) : RelativeLayout(context, attrs, defStyleAttr) {

  private var whiteAddToGooglePayButtonNoShadow: RelativeLayout
  private var blackAddToGooglePayButton: RelativeLayout
  private var whiteAddToGooglePayButton: RelativeLayout
  private var viewLayout: RelativeLayout
  private var onAddToWalletClicked: (() -> Unit)? = null
  private var shouldSetThemeAccordingToSystemTheme = false
  private var isDarkMode = false

  /**
   * This variable holds the style of the 'Add To GPay button'.
   * when it is set it will redisplay the button if it is necessary.
   */
  private var currentStyle: UNGooglePayButtonStyle = UNGooglePayButtonStyle.Regular
    set(value) {
      val hasChanged = field != value
      field = value
      if (hasChanged) {
        display()
      }
    }

  /**
   * This variable holds the theme of the app's background color.
   * when it is set it will redisplay the button if it is necessary.
   */
  private var currentTheme: UNGooglePayButtonTheme = UNGooglePayButtonTheme.Light
    set(value) {
      val hasChanged = field != value
      field = value
      if (hasChanged) {
        display()
      }
    }

  init {
    val inflater = context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
    inflater.inflate(R.layout.un_view_google_push_provisioning, this)

    whiteAddToGooglePayButtonNoShadow =
      findViewById(R.id.white_add_to_googlepay_button_no_shadow)
    blackAddToGooglePayButton = findViewById(R.id.black_add_to_googlepay_button)
    whiteAddToGooglePayButton = findViewById(R.id.white_add_to_googlepay_button)
    viewLayout = findViewById(R.id.google_view_push_provisioning_layout)

    blackAddToGooglePayButton.setOnClickListener {
      onAddToWalletClicked?.invoke()
    }

    whiteAddToGooglePayButton.setOnClickListener {
      onAddToWalletClicked?.invoke()
    }

    whiteAddToGooglePayButtonNoShadow.setOnClickListener {
      onAddToWalletClicked?.invoke()
    }

    showAddToGooglePlayButton(blackAddToGooglePayButton)
  }

  fun setStyle(style: UNGooglePayButtonStyle) {
    this.currentStyle = style
  }

  fun setTheme(theme: UNGooglePayButtonTheme) {
    setThemeAccordingToSystemTheme(false)
    this.currentTheme = theme
  }

  fun onAddToWalletClicked(callback: () -> Unit) {
    onAddToWalletClicked = callback
  }

  /**
   * This method will remove all the views related to this class off the screen.
   */
  fun clearGooglePayViews() {
    viewLayout.visibility = INVISIBLE
    whiteAddToGooglePayButtonNoShadow.visibility = INVISIBLE
    blackAddToGooglePayButton.visibility = INVISIBLE
    whiteAddToGooglePayButton.visibility = INVISIBLE
  }

  /**
   * This private method will display the view according to night mode or it's theme and style.
   */
  private fun display() {
    clearGooglePayViews()
    viewLayout.visibility = VISIBLE
    if (shouldSetThemeAccordingToSystemTheme) {
      showAddToGooglePlayButtonByUserUiMode()
    } else {
      updateViewsAccordingToThemeAndStyle()
    }
  }

  private fun updateViewsAccordingToThemeAndStyle() {
    when (currentTheme) {
      UNGooglePayButtonTheme.Light -> {
        when (currentStyle) {
          UNGooglePayButtonStyle.Regular -> {
            showAddToGooglePlayButton(blackAddToGooglePayButton)
          }
          UNGooglePayButtonStyle.Outlined -> {
            showAddToGooglePlayButton(whiteAddToGooglePayButtonNoShadow)
          }
        }
      }
      UNGooglePayButtonTheme.Dark, UNGooglePayButtonTheme.Colorful -> {
        when (currentStyle) {
          UNGooglePayButtonStyle.Regular -> {
            showAddToGooglePlayButton(whiteAddToGooglePayButton)
          }
          else -> {
          }
        }
      }
    }
  }

  /**
   * This method will determine the 'Add to GPay' button theme according to the mobile phone's Night mode if it is set to 'true'.
   */
  fun setThemeAccordingToSystemTheme(shouldSetThemeAccordingToSystemTheme: Boolean) {
    this.shouldSetThemeAccordingToSystemTheme = shouldSetThemeAccordingToSystemTheme
    updateViewAccordingToSystemIfNeeded()
  }

  fun updateThemeAccordingToSystem() {
    updateViewAccordingToSystemIfNeeded()
  }

  private fun updateViewAccordingToSystemIfNeeded() {
    if (shouldSetThemeAccordingToSystemTheme) {
      changeThemeAccordingToSystem()
    }
  }

  private fun changeThemeAccordingToSystem() {
    when (resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK) {
      Configuration.UI_MODE_NIGHT_YES -> {
        isDarkMode = true
        currentTheme = UNGooglePayButtonTheme.Dark
      }

      Configuration.UI_MODE_NIGHT_NO -> {
        isDarkMode = false
        currentTheme = UNGooglePayButtonTheme.Light
      }
    }
  }

  private fun showAddToGooglePlayButtonByUserUiMode() {
    val buttonType = if (isDarkMode) whiteAddToGooglePayButton else blackAddToGooglePayButton
    showAddToGooglePlayButton(buttonType)
  }

  private fun showAddToGooglePlayButton(button: RelativeLayout) {
    button.visibility = VISIBLE
  }
}