/*
 * Copyright 2018 Google LLC
 *
 * 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
 *
 *     https://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.example.kotlindemos

import android.graphics.Color
import android.os.Bundle
import android.view.View
import android.widget.AdapterView
import android.widget.SeekBar
import android.widget.Spinner
import android.widget.CheckBox
import android.widget.ArrayAdapter
import androidx.appcompat.app.AppCompatActivity
import com.google.android.gms.maps.CameraUpdateFactory
import com.google.android.gms.maps.model.Dash
import com.google.android.gms.maps.model.Dot
import com.google.android.gms.maps.model.Gap
import com.google.android.gms.maps.GoogleMap
import com.google.android.gms.maps.model.JointType
import com.google.android.gms.maps.model.LatLng
import com.google.android.gms.maps.OnMapReadyCallback
import com.google.android.gms.maps.model.PatternItem
import com.google.android.gms.maps.model.Polygon
import com.google.android.gms.maps.model.PolygonOptions
import com.google.android.gms.maps.SupportMapFragment

import java.util.Arrays

/**
 * This shows how to draw polygons on a map.
 */
class PolygonDemoActivity :
        AppCompatActivity(),
        OnMapReadyCallback,
        SeekBar.OnSeekBarChangeListener,
        AdapterView.OnItemSelectedListener {

    private val center = LatLng(-20.0, 130.0)
    private val MAX_WIDTH_PX = 100
    private val MAX_HUE_DEGREES = 360
    private val MAX_ALPHA = 255
    private val PATTERN_DASH_LENGTH_PX = 50
    private val PATTERN_GAP_LENGTH_PX = 10
    private val dot = Dot()
    private val dash = Dash(PATTERN_DASH_LENGTH_PX.toFloat())
    private val gap = Gap(PATTERN_GAP_LENGTH_PX.toFloat())
    private val patternDotted = Arrays.asList(dot, gap)
    private val patternDashed = Arrays.asList(dash, gap)
    private val patternMixed = Arrays.asList(dot, gap, dot, dash, gap)

    private lateinit var mutablePolygon: Polygon
    private lateinit var fillHueBar: SeekBar
    private lateinit var fillAlphaBar: SeekBar
    private lateinit var strokeWidthBar: SeekBar
    private lateinit var strokeHueBar: SeekBar
    private lateinit var strokeAlphaBar: SeekBar
    private lateinit var strokeJointTypeSpinner: Spinner
    private lateinit var strokePatternSpinner: Spinner
    private lateinit var clickabilityCheckbox: CheckBox

    // These are the options for polygon stroke joints and patterns. We use their
    // string resource IDs as identifiers.

    private val jointTypeNameResourceIds = intArrayOf(R.string.joint_type_default, // Default
            R.string.joint_type_bevel, R.string.joint_type_round)

    private val patternTypeNameResourceIds = intArrayOf(R.string.pattern_solid, // Default
            R.string.pattern_dashed, R.string.pattern_dotted, R.string.pattern_mixed)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.polygon_demo)

        fillHueBar = findViewById<SeekBar>(R.id.fillHueSeekBar).apply {
            max = MAX_HUE_DEGREES
            progress = MAX_HUE_DEGREES / 2
        }

        fillAlphaBar = findViewById<SeekBar>(R.id.fillAlphaSeekBar).apply {
            max = MAX_ALPHA
            progress = MAX_ALPHA / 2
        }

        strokeWidthBar = findViewById<SeekBar>(R.id.strokeWidthSeekBar).apply {
            max = MAX_WIDTH_PX
            progress = MAX_WIDTH_PX / 3
        }

        strokeHueBar = findViewById<SeekBar>(R.id.strokeHueSeekBar).apply {
            max = MAX_HUE_DEGREES
            progress = 0
        }

        strokeAlphaBar = findViewById<SeekBar>(R.id.strokeAlphaSeekBar).apply {
            max = MAX_ALPHA
            progress = MAX_ALPHA
        }

        strokeJointTypeSpinner = findViewById<Spinner>(R.id.strokeJointTypeSpinner).apply {
            adapter = ArrayAdapter(
                    this@PolygonDemoActivity, android.R.layout.simple_spinner_item,
                    getResourceStrings(jointTypeNameResourceIds))
        }

        strokePatternSpinner = findViewById<Spinner>(R.id.strokePatternSpinner).apply {
            adapter = ArrayAdapter(
                    this@PolygonDemoActivity, android.R.layout.simple_spinner_item,
                    getResourceStrings(patternTypeNameResourceIds))
        }

        clickabilityCheckbox = findViewById(R.id.toggleClickability)

        val mapFragment = supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment
        mapFragment.getMapAsync(this)
    }

    private fun getResourceStrings(resourceIds: IntArray): List<String> {
        return resourceIds.map { getString(it) }
    }

    override fun onMapReady(googleMap: GoogleMap) {

        // return early if the map was not initialised properly
        googleMap ?: return

        val fillColorArgb = Color.HSVToColor(
                fillAlphaBar.progress, floatArrayOf(fillHueBar.progress.toFloat(), 1f, 1f))
        val strokeColorArgb = Color.HSVToColor(
                strokeAlphaBar.progress, floatArrayOf(strokeHueBar.progress.toFloat(), 1f, 1f))

        with(googleMap) {
            // Override the default content description on the view, for accessibility mode.
            setContentDescription(getString(R.string.polygon_demo_description))
            // Move the googleMap so that it is centered on the mutable polygon.
            moveCamera(CameraUpdateFactory.newLatLngZoom(center, 4f))

            // Create a rectangle with two rectangular holes.
            mutablePolygon = addPolygon(PolygonOptions().apply {
                addAll(createRectangle(center, 5.0, 5.0))
                addHole(createRectangle(LatLng(-22.0, 128.0), 1.0, 1.0))
                addHole(createRectangle(LatLng(-18.0, 133.0), 0.5, 1.5))
                fillColor(fillColorArgb)
                strokeColor(strokeColorArgb)
                strokeWidth(strokeWidthBar.progress.toFloat())
                clickable(clickabilityCheckbox.isChecked)
            })

            // Add a listener for polygon clicks that changes the clicked polygon's stroke color.
            setOnPolygonClickListener { polygon ->
                // Flip the red, green and blue components of the polygon's stroke color.
                polygon.strokeColor = polygon.strokeColor xor 0x00ffffff
            }
        }

        // set listeners on seekBars
        arrayOf(fillHueBar, fillAlphaBar, strokeWidthBar, strokeHueBar, strokeAlphaBar).map {
            it.setOnSeekBarChangeListener(this)
        }

        // set listeners on spinners
        arrayOf(strokeJointTypeSpinner, strokePatternSpinner).map {
            it.onItemSelectedListener = this
        }

        // set line pattern and joint type based on current spinner position
        with(mutablePolygon) {
            strokeJointType = getSelectedJointType(strokeJointTypeSpinner.selectedItemPosition)
            strokePattern = getSelectedPattern(strokePatternSpinner.selectedItemPosition)
        }

    }

    /**
     * Creates a List of LatLngs that form a rectangle with the given dimensions.
     */
    private fun createRectangle(
            center: LatLng,
            halfWidth: Double,
            halfHeight: Double
    ): List<LatLng> {
        return Arrays.asList(
                LatLng(center.latitude - halfHeight, center.longitude - halfWidth),
                LatLng(center.latitude - halfHeight, center.longitude + halfWidth),
                LatLng(center.latitude + halfHeight, center.longitude + halfWidth),
                LatLng(center.latitude + halfHeight, center.longitude - halfWidth),
                LatLng(center.latitude - halfHeight, center.longitude - halfWidth))
    }

    private fun getSelectedJointType(pos: Int): Int {
        return when (jointTypeNameResourceIds[pos]) {
            R.string.joint_type_bevel -> JointType.BEVEL
            R.string.joint_type_round -> JointType.ROUND
            R.string.joint_type_default -> JointType.DEFAULT
            else -> 0
        }
    }

    private fun getSelectedPattern(pos: Int): List<PatternItem>? {
        return when (patternTypeNameResourceIds[pos]) {
            R.string.pattern_solid -> null
            R.string.pattern_dotted -> patternDotted
            R.string.pattern_dashed -> patternDashed
            R.string.pattern_mixed -> patternMixed
            else -> null
        }
    }

    /**
     * Toggles the clickability of the polygon based on the state of the View that triggered this
     * call.
     * This callback is defined on the CheckBox in the layout for this Activity.
     */
    fun toggleClickability(view: View) {
        if (view is CheckBox) {
            mutablePolygon.isClickable = view.isChecked
        }
    }


    /**
     * Listener that is called when a seek bar is moved.
     * Can change polygon fill color/transparency, stroke color/transparency and stroke width.
     */
    override fun onProgressChanged(seekBar: SeekBar?, progress: Int,
                                   fromUser: Boolean) {

        mutablePolygon.fillColor = when (seekBar) {
            fillHueBar -> Color.HSVToColor(Color.alpha(mutablePolygon.fillColor),
                    floatArrayOf(progress.toFloat(), 1f, 1f))
            fillAlphaBar -> {
                val prevColor = mutablePolygon.fillColor
                Color.argb(progress, Color.red(prevColor), Color.green(prevColor),
                        Color.blue(prevColor))
            }
            else -> mutablePolygon.fillColor
        }

        mutablePolygon.strokeColor = when (seekBar) {
            strokeHueBar -> Color.HSVToColor(
                    Color.alpha(mutablePolygon.strokeColor),
                    floatArrayOf(progress.toFloat(), 1f, 1f))
            strokeAlphaBar -> {
                val prevColorArgb = mutablePolygon.strokeColor
                Color.argb(progress, Color.red(prevColorArgb),
                        Color.green(prevColorArgb), Color.blue(prevColorArgb))
            }
            else -> mutablePolygon.strokeColor
        }

        if (seekBar == strokeWidthBar) mutablePolygon.strokeWidth = progress.toFloat()

    }

    override fun onStartTrackingTouch(seekBar: SeekBar?) {
        // do nothing
    }

    override fun onStopTrackingTouch(seekBar: SeekBar?) {
        // do nothing
    }

    /**
     * Listener for when an item is selected using a spinner.
     * Can change line pattern and joint type.
     */
    override fun onItemSelected(parent: AdapterView<*>?, view: View?, pos: Int,
                                id: Long) {
        when (parent?.id) {
            R.id.strokeJointTypeSpinner ->
                mutablePolygon.strokeJointType = getSelectedJointType(pos)
            R.id.strokePatternSpinner ->
                mutablePolygon.strokePattern = getSelectedPattern(pos)
        }
    }

    override fun onNothingSelected(parent: AdapterView<*>?) {
        // don't do anything here
    }

}