simplauncher/app/src/main/java/com/sduduzog/slimlauncher/ui/notes/EditNoteFragment.kt

package com.sduduzog.slimlauncher.ui.notes

import android.content.Context
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.view.inputmethod.InputMethodManager
import androidx.lifecycle.ViewModelProviders
import androidx.navigation.Navigation
import com.sduduzog.slimlauncher.R
import com.sduduzog.slimlauncher.data.MainViewModel
import com.sduduzog.slimlauncher.data.model.Note
import com.sduduzog.slimlauncher.utils.BaseFragment
import kotlinx.android.synthetic.main.edit_note_fragment.*
import java.security.MessageDigest
import java.util.*

class EditNoteFragment : BaseFragment() {

    override fun getFragmentView(): ViewGroup = edit_note_fragment
    private lateinit var note: Note
    private lateinit var viewModel: MainViewModel
    private lateinit var initialDigest: String
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        arguments.let {
            note = if (it != null && it.containsKey(getString(R.string.nav_key_note))) {
                it.get(getString(R.string.nav_key_note)) as Note
            } else {
                Note(-1L, "")
            }
        }
        initialDigest = hash(note.title + note.body)
        activity?.let {
            viewModel = ViewModelProviders.of(it).get(MainViewModel::class.java)
        } ?: throw Error("Activity null, something here is fucked up")
    }

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        return inflater.inflate(R.layout.edit_note_fragment, container, false)
    }

    override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)

        if (note.edited == -1L) {
            // Wait
        } else {
            edit_note_fragment_title.setText(note.title.orEmpty())
            edit_note_fragment_body.setText(note.body)
        }

        if (edit_note_fragment_body.requestFocus()) {
            val imm = activity!!.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
            imm.showSoftInput(edit_note_fragment_title, InputMethodManager.SHOW_IMPLICIT)
        }
        edit_note_fragment_save.setOnClickListener {
            save()?.let {
                val bundle = Bundle()
                bundle.putSerializable(getString(R.string.nav_key_note), it)
                Navigation.findNavController(edit_note_fragment).navigate(R.id.action_editNoteFragment_to_noteFragment, bundle)
            }
        }
    }

    private fun hash(input: String): String {
        val bytes = input.toByteArray(charset("UTF-8"))
        val md = MessageDigest.getInstance("MD5")
        md.update(bytes)
        return String(md.digest())
    }

    private fun save(): Long? {
        val body = edit_note_fragment_body.text.toString()
        if (body.isEmpty()) return null
        val title = edit_note_fragment_title.text.toString()
        val timestamp = Date().time
        if (note.id == -1L) {
            val newNote = Note(timestamp, body, timestamp)
            newNote.title = title.trim()
            newNote.body = body.trim()
            viewModel.add(newNote)
            return newNote.id
        }
        val currentDigest = hash(title + body)
        if (initialDigest == currentDigest) return null
        viewModel.update(note)
        return note.id
    }
}