/* Copyright 2019 Tusky Contributors
 *
 * This file is a part of Tusky.
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation; either version 3 of the
 * License, or (at your option) any later version.
 *
 * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with Tusky; if not,
 * see <http://www.gnu.org/licenses>. */

package com.keylesspalace.tusky.components.compose.dialog

import android.content.DialogInterface
import android.graphics.drawable.Drawable
import android.net.Uri
import android.view.WindowManager
import android.widget.FrameLayout
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.lifecycleScope
import com.bumptech.glide.Glide
import com.bumptech.glide.load.DataSource
import com.bumptech.glide.load.engine.GlideException
import com.bumptech.glide.load.resource.bitmap.DownsampleStrategy
import com.bumptech.glide.request.RequestListener
import com.bumptech.glide.request.target.Target
import com.google.android.material.dialog.MaterialAlertDialogBuilder
import com.keylesspalace.tusky.databinding.DialogFocusBinding
import com.keylesspalace.tusky.entity.Attachment.Focus
import kotlinx.coroutines.launch

fun <T> T.makeFocusDialog(
    existingFocus: Focus?,
    previewUri: Uri,
    onUpdateFocus: suspend (Focus) -> Unit
) where T : AppCompatActivity, T : LifecycleOwner {
    val focus = existingFocus ?: Focus(0.0f, 0.0f) // Default to center

    val dialogBinding = DialogFocusBinding.inflate(layoutInflater)

    dialogBinding.focusIndicator.setFocus(focus)

    Glide.with(this)
        .load(previewUri)
        .downsample(DownsampleStrategy.CENTER_INSIDE)
        .listener(object : RequestListener<Drawable> {
            override fun onLoadFailed(
                error: GlideException?,
                model: Any?,
                target: Target<Drawable?>,
                isFirstResource: Boolean
            ): Boolean {
                return false
            }

            override fun onResourceReady(
                resource: Drawable,
                model: Any,
                target: Target<Drawable?>?,
                dataSource: DataSource,
                isFirstResource: Boolean
            ): Boolean {
                val width = resource.intrinsicWidth
                val height = resource.intrinsicHeight

                val viewWidth = dialogBinding.imageView.width
                val viewHeight = dialogBinding.imageView.height

                val scaledHeight = (viewWidth.toFloat() / width.toFloat()) * height

                dialogBinding.focusIndicator.setImageSize(viewWidth, scaledHeight.toInt())

                // We want the dialog to be a little taller than the image, so you can slide your thumb past the image border,
                // but if it's *too* much taller that looks weird. See if a threshold has been crossed:
                if (width > height) {
                    val maxHeight = dialogBinding.focusIndicator.maxAttractiveHeight()

                    if (viewHeight > maxHeight) {
                        val verticalShrinkLayout = FrameLayout.LayoutParams(viewWidth, maxHeight)
                        dialogBinding.imageView.layoutParams = verticalShrinkLayout
                        dialogBinding.focusIndicator.layoutParams = verticalShrinkLayout
                    }
                }
                return false // Pass through
            }
        })
        .into(dialogBinding.imageView)

    val okListener = { dialog: DialogInterface, _: Int ->
        lifecycleScope.launch {
            onUpdateFocus(dialogBinding.focusIndicator.getFocus())
        }
        dialog.dismiss()
    }

    val dialog = MaterialAlertDialogBuilder(this)
        .setView(dialogBinding.root)
        .setPositiveButton(android.R.string.ok, okListener)
        .setNegativeButton(android.R.string.cancel, null)
        .create()

    val window = dialog.window
    window?.setSoftInputMode(
        WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE
    )

    dialog.show()
}
