LibreTube/app/src/main/java/com/github/libretube/util/ThemeHelper.kt

package com.github.libretube.util

import android.app.Activity
import android.content.ComponentName
import android.content.Context
import android.content.pm.PackageManager
import android.text.Spanned
import android.util.TypedValue
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.app.AppCompatDelegate
import androidx.core.text.HtmlCompat
import com.github.libretube.R
import com.github.libretube.constants.PreferenceKeys
import com.github.libretube.ui.adapters.IconsSheetAdapter
import com.google.android.material.color.DynamicColors

object ThemeHelper {

    /**
     * Set the theme, including accent color and night mode
     */
    fun updateTheme(activity: AppCompatActivity) {
        val themeMode = PreferenceHelper.getString(PreferenceKeys.THEME_MODE, "A")

        updateAccentColor(activity)
        applyDynamicColorsIfEnabled(activity)
        applyPureThemeIfEnabled(activity)
        updateThemeMode(themeMode)
    }

    /**
     * Update the accent color of the app
     */
    private fun updateAccentColor(
        activity: AppCompatActivity
    ) {
        val theme = when (
            PreferenceHelper.getString(
                PreferenceKeys.ACCENT_COLOR,
                "purple"
            )
        ) {
            // set the accent color, use the pure black/white theme if enabled
            "my" -> R.style.BaseTheme
            "red" -> R.style.Theme_Red
            "blue" -> R.style.Theme_Blue
            "yellow" -> R.style.Theme_Yellow
            "green" -> R.style.Theme_Green
            "purple" -> R.style.Theme_Purple
            "monochrome" -> R.style.Theme_Monochrome
            "violet" -> R.style.Theme_Violet
            else -> R.style.Theme_Purple
        }
        activity.setTheme(theme)
    }

    /**
     * apply dynamic colors to the activity
     */
    private fun applyDynamicColorsIfEnabled(activity: AppCompatActivity) {
        if (
            PreferenceHelper.getString(
                PreferenceKeys.ACCENT_COLOR,
                "purple"
            ) == "my"
        ) {
            DynamicColors.applyToActivityIfAvailable(activity)
        }
    }

    /**
     * apply the pure black/white theme
     */
    private fun applyPureThemeIfEnabled(activity: Activity) {
        val pureThemeEnabled = PreferenceHelper.getBoolean(
            PreferenceKeys.PURE_THEME,
            false
        )
        if (pureThemeEnabled) activity.theme.applyStyle(R.style.Pure, true)
    }

    /**
     * set the theme mode (light, dark, auto)
     */
    private fun updateThemeMode(themeMode: String) {
        val mode = when (themeMode) {
            "A" -> AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM
            "L" -> AppCompatDelegate.MODE_NIGHT_NO
            "D" -> AppCompatDelegate.MODE_NIGHT_YES
            else -> AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM
        }
        AppCompatDelegate.setDefaultNightMode(mode)
    }

    /**
     * change the app icon
     */
    fun changeIcon(context: Context, newLogoActivityAlias: String) {
        // Disable Old Icon(s)
        for (appIcon in IconsSheetAdapter.availableIcons) {
            val activityClass = "com.github.libretube." + appIcon.activityAlias

            // remove old icons
            context.packageManager.setComponentEnabledSetting(
                ComponentName(context.packageName, activityClass),
                PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
                PackageManager.DONT_KILL_APP
            )
        }

        // set the class name for the activity alias
        val newLogoActivityClass = "com.github.libretube." + newLogoActivityAlias
        // Enable New Icon
        context.packageManager.setComponentEnabledSetting(
            ComponentName(context.packageName, newLogoActivityClass),
            PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
            PackageManager.DONT_KILL_APP
        )
    }

    /**
     * Get a color by a resource code
     */
    fun getThemeColor(context: Context, colorCode: Int): Int {
        val value = TypedValue()
        context.theme.resolveAttribute(colorCode, value, true)
        return value.data
    }

    /**
     * Get the styled app name
     */
    fun getStyledAppName(context: Context): Spanned {
        val colorPrimary = getThemeColor(context, R.attr.colorPrimaryDark)
        val hexColor = String.format("#%06X", (0xFFFFFF and colorPrimary))
        return HtmlCompat.fromHtml(
            "Libre<span  style='color:$hexColor';>Tube</span>",
            HtmlCompat.FROM_HTML_MODE_COMPACT
        )
    }
}