/*
 This file is part of GNU Taler
 (C) 2019 Taler Systems S.A.

 GNU Taler 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, or (at your option) any later version.

 GNU Taler 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
 GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 */

package net.taler.wallet

import android.app.Dialog
import android.content.Context
import android.content.DialogInterface
import android.content.Intent
import android.os.Bundle
import android.provider.DocumentsContract
import android.util.Log
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import androidx.appcompat.app.AlertDialog
import androidx.fragment.app.DialogFragment
import androidx.lifecycle.ViewModelProviders


interface ResetDialogEventListener {
    fun onResetConfirmed()
    fun onResetCancelled()
}


class ResetDialogFragment : DialogFragment() {
    private lateinit var model: WalletViewModel
    private lateinit var listener: ResetDialogEventListener

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        return activity?.let {
            // Use the Builder class for convenient dialog construction
            val builder = AlertDialog.Builder(it)
            builder.setMessage("Do you really want to reset the wallet and lose all coins and purchases?  Consider making a backup first.")
                .setPositiveButton("Reset") { _, _ ->
                    listener.onResetConfirmed()
                }
                .setNegativeButton("Cancel") { _, _ ->
                    listener.onResetCancelled()
                }
            // Create the AlertDialog object and return it
            builder.create()
        } ?: throw IllegalStateException("Activity cannot be null")
    }

    override fun onAttach(context: Context) {
        super.onAttach(context)
        // Verify that the host activity implements the callback interface
        try {
            // Instantiate the NoticeDialogListener so we can send events to the host
            listener = context as ResetDialogEventListener
        } catch (e: ClassCastException) {
            // The activity doesn't implement the interface, throw exception
            throw ClassCastException((context.toString() +
                    " must implement ResetDialogEventListener"))
        }
    }
}

/**
 * A simple [Fragment] subclass.
 *
 */
class Settings : Fragment() {

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        when (requestCode) {
            CREATE_FILE -> {
                if (data == null) {
                    return
                }
                Log.i(TAG, "got createFile result with URL ${data.data}")
            }
            PICK_FILE -> {
                if (data == null) {
                    return
                }
                Log.i(TAG, "got pickFile result with URL ${data.data}")
            }
            else -> {

            }
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        val view = inflater.inflate(R.layout.fragment_settings, container, false)
        view.findViewById<Button>(R.id.button_reset_wallet_dangerously).setOnClickListener {
            val d = ResetDialogFragment()
            d.show(requireActivity().supportFragmentManager, "walletResetDialog")
        }
        view.findViewById<Button>(R.id.button_backup_export).setOnClickListener {
            val intent = Intent(Intent.ACTION_CREATE_DOCUMENT).apply {
                addCategory(Intent.CATEGORY_OPENABLE)
                type = "application/json"
                putExtra(Intent.EXTRA_TITLE, "taler-wallet-backup.json")

                // Optionally, specify a URI for the directory that should be opened in
                // the system file picker before your app creates the document.
                //putExtra(DocumentsContract.EXTRA_INITIAL_URI, pickerInitialUri)
            }
            startActivityForResult(intent, CREATE_FILE)
        }
        view.findViewById<Button>(R.id.button_backup_import).setOnClickListener {
            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT).apply {
                addCategory(Intent.CATEGORY_OPENABLE)
                type = "application/json"

                //putExtra(DocumentsContract.EXTRA_INITIAL_URI, pickerInitialUri)
            }

            startActivityForResult(intent, PICK_FILE)
        }
        return view
    }

    companion object {
        private const val TAG = "taler-wallet"
        private const val CREATE_FILE = 1
        private const val PICK_FILE = 2
    }
}