package info.nightscout.androidaps.tile

import android.content.SharedPreferences
import androidx.annotation.DrawableRes
import androidx.annotation.StringRes
import androidx.core.content.ContextCompat
import androidx.preference.PreferenceManager
import androidx.wear.tiles.ActionBuilders
import androidx.wear.tiles.ColorBuilders.argb
import androidx.wear.tiles.DeviceParametersBuilders.DeviceParameters
import androidx.wear.tiles.DimensionBuilders.SpProp
import androidx.wear.tiles.DimensionBuilders.dp
import androidx.wear.tiles.DimensionBuilders.sp
import androidx.wear.tiles.LayoutElementBuilders.*
import androidx.wear.tiles.ModifiersBuilders.Background
import androidx.wear.tiles.ModifiersBuilders.Clickable
import androidx.wear.tiles.ModifiersBuilders.Corner
import androidx.wear.tiles.ModifiersBuilders.Modifiers
import androidx.wear.tiles.ModifiersBuilders.Semantics
import androidx.wear.tiles.RequestBuilders
import androidx.wear.tiles.RequestBuilders.ResourcesRequest
import androidx.wear.tiles.ResourceBuilders.AndroidImageResourceByResId
import androidx.wear.tiles.ResourceBuilders.ImageResource
import androidx.wear.tiles.ResourceBuilders.Resources
import androidx.wear.tiles.TileBuilders.Tile
import androidx.wear.tiles.TileService
import androidx.wear.tiles.TimelineBuilders.Timeline
import androidx.wear.tiles.TimelineBuilders.TimelineEntry
import com.google.common.util.concurrent.ListenableFuture
import info.nightscout.androidaps.R
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.Job
import kotlinx.coroutines.guava.future
import kotlin.math.sqrt

private const val SPACING_ACTIONS = 3f
private const val ICON_SIZE_FRACTION = 0.4f // Percentage of button diameter
private const val BUTTON_COLOR = R.color.gray_850
private const val LARGE_SCREEN_WIDTH_DP = 210

interface TileSource {

    fun getActions(): List<Action>
    fun getDefaultConfig(): Map<String, String>
}

data class Action(
    val id: Int,
    val settingName: String,
    @StringRes val nameRes: Int,
    val activityClass: String,
    @DrawableRes val iconRes: Int,
    val background: Boolean = false,
    val actionString: String? = null,
)

enum class WearControl {
    NO_DATA, ENABLED, DISABLED
}

abstract class TileBase : TileService() {

    open val resourceVersion = "1"
    open val idIconActionPrefix = "ic_action_"

    abstract val preferencePrefix: String
    abstract val source: TileSource

    private val serviceJob = Job()
    private val serviceScope = CoroutineScope(Dispatchers.IO + serviceJob)

    override fun onTileRequest(
        requestParams: RequestBuilders.TileRequest
    ): ListenableFuture<Tile> = serviceScope.future {
        val actionsSelected = getSelectedActions()
        val wearControl = getWearControl()

        Tile.Builder()
            .setResourcesVersion(resourceVersion)
            .setTimeline(
                Timeline.Builder().addTimelineEntry(
                    TimelineEntry.Builder().setLayout(
                        Layout.Builder().setRoot(layout(wearControl, actionsSelected, requestParams.deviceParameters!!)).build()
                    ).build()
                ).build()
            )
            .build()
    }

    override fun onResourcesRequest(
        requestParams: ResourcesRequest
    ): ListenableFuture<Resources> = serviceScope.future {
        Resources.Builder()
            .setVersion(resourceVersion)
            .apply {
                source.getActions().mapNotNull { action ->
                    addIdToImageMapping(
                        idIconActionPrefix + action.id,
                        ImageResource.Builder()
                            .setAndroidResourceByResId(
                                AndroidImageResourceByResId.Builder()
                                    .setResourceId(action.iconRes)
                                    .build()
                            )
                            .build()
                    )
                }
            }
            .build()
    }

    private fun layout(wearControl: WearControl, actions: List<Action>, deviceParameters: DeviceParameters): LayoutElement {
        if (wearControl == WearControl.DISABLED) {
            return Text.Builder()
                .setText(resources.getString(R.string.wear_control_not_enabled))
                .build()
        } else if (wearControl == WearControl.NO_DATA) {
            return Text.Builder()
                .setText(resources.getString(R.string.wear_control_no_data))
                .build()
        }
        if (actions.isNotEmpty()) {
            val b = Column.Builder()
            if (actions.size == 1 || actions.size == 3) {
                b.addContent(addRowSingle(actions[0], deviceParameters))
            }
            if (actions.size == 4 || actions.size == 2) {
                b.addContent(addRowDouble(actions[0], actions[1], deviceParameters))
            }
            if (actions.size == 3) {
                b.addContent(addRowDouble(actions[1], actions[2], deviceParameters))
            }
            if (actions.size == 4) {
                b.addContent(Spacer.Builder().setHeight(dp(SPACING_ACTIONS)).build())
                    .addContent(addRowDouble(actions[2], actions[3], deviceParameters))
            }
            return b.build()
        }
        return Text.Builder()
            .setText(resources.getString(R.string.tile_no_config))
            .build()
    }

    private fun addRowSingle(action: Action, deviceParameters: DeviceParameters): LayoutElement =
        Row.Builder()
            .addContent(action(action, deviceParameters))
            .build()

    private fun addRowDouble(action1: Action, action2: Action, deviceParameters: DeviceParameters): LayoutElement =
        Row.Builder()
            .addContent(action(action1, deviceParameters))
            .addContent(Spacer.Builder().setWidth(dp(SPACING_ACTIONS)).build())
            .addContent(action(action2, deviceParameters))
            .build()

    private fun doAction(action: Action): ActionBuilders.Action {
        val inBackground = ActionBuilders.AndroidBooleanExtra.Builder().setValue(action.background).build()
        val builder = ActionBuilders.AndroidActivity.Builder()
            .setClassName(action.activityClass)
            .setPackageName(this.packageName)
            .addKeyToExtraMapping("inBackground", inBackground)
        if (action.actionString != null) {
            val actionString = ActionBuilders.AndroidStringExtra.Builder().setValue(action.actionString).build()
            builder.addKeyToExtraMapping("actionString", actionString)
        }

        return ActionBuilders.LaunchAction.Builder()
            .setAndroidActivity(builder.build())
            .build()
    }

    private fun action(action: Action, deviceParameters: DeviceParameters): LayoutElement {
        val circleDiameter = ((sqrt(2f) - 1) * deviceParameters.screenHeightDp) - (2 * SPACING_ACTIONS)
        val iconSize = dp(circleDiameter * ICON_SIZE_FRACTION)
        val text = resources.getString(action.nameRes)
        return Box.Builder()
            .setWidth(dp(circleDiameter))
            .setHeight(dp(circleDiameter))
            .setModifiers(
                Modifiers.Builder()
                    .setBackground(
                        Background.Builder()
                            .setColor(
                                argb(ContextCompat.getColor(baseContext, BUTTON_COLOR))
                            )
                            .setCorner(
                                Corner.Builder().setRadius(dp(circleDiameter / 2)).build()
                            )
                            .build()
                    )
                    .setSemantics(
                        Semantics.Builder()
                            .setContentDescription(text)
                            .build()
                    )
                    .setClickable(
                        Clickable.Builder()
                            .setOnClick(doAction(action))
                            .build()
                    )
                    .build()
            )
            .addContent(
                Column.Builder()
                    .addContent(
                        Image.Builder()
                            .setWidth(iconSize)
                            .setHeight(iconSize)
                            .setResourceId(idIconActionPrefix + action.id)
                            .build()
                    ).addContent(
                        Text.Builder()
                            .setText(text)
                            .setFontStyle(
                                FontStyle.Builder()
                                    .setWeight(FONT_WEIGHT_BOLD)
                                    .setColor(
                                        argb(ContextCompat.getColor(baseContext, R.color.white))
                                    )
                                    .setSize(buttonTextSize(deviceParameters, text))
                                    .build()
                            )
                            .build()
                    ).build()
            )
            .build()
    }

    private fun buttonTextSize(deviceParameters: DeviceParameters, text: String): SpProp {
        if (text.length > 6) {
            return sp(if (isLargeScreen(deviceParameters)) 14f else 12f)
        }
        return sp(if (isLargeScreen(deviceParameters)) 16f else 14f)
    }

    private fun isLargeScreen(deviceParameters: DeviceParameters): Boolean {
        return deviceParameters.screenWidthDp >= LARGE_SCREEN_WIDTH_DP
    }

    private fun getWearControl(): WearControl {
        val sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this)
        if (!sharedPrefs.contains("wearcontrol")) {
            return WearControl.NO_DATA
        }
        val wearControlPref = sharedPrefs.getBoolean("wearcontrol", false)
        if (wearControlPref) {
            return WearControl.ENABLED
        }
        return WearControl.DISABLED
    }

    private fun getSelectedActions(): List<Action> {
        val sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this)
        setDefaultSettings(sharedPrefs)

        val actionList: MutableList<Action> = mutableListOf()
        for (i in 1..4) {
            val action = getActionFromPreference(sharedPrefs, i)
            if (action != null) {
                actionList.add(action)
            }
        }
        if (actionList.isEmpty()) {
            return source.getActions().take(4)
        }
        return actionList
    }

    private fun getActionFromPreference(sharedPrefs: SharedPreferences, index: Int): Action? {
        val actionPref = sharedPrefs.getString(preferencePrefix + index, "none")
        return source.getActions().find { action -> action.settingName == actionPref }
    }

    private fun setDefaultSettings(sharedPrefs: SharedPreferences) {
        val defaults = source.getDefaultConfig()
        val firstKey = defaults.firstNotNullOf { settings -> settings.key }
        if (!sharedPrefs.contains(firstKey)) {
            val editor = sharedPrefs.edit()
            for ((key, value) in defaults) {
                editor.putString(key, value)
            }
            editor.apply()
        }
    }

}