/**
 * ProjectLaogai
 *
 * Copyright 2019-2020  <seil0@mosad.xyz>
 *
 * 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 *
 */

package org.mosad.seil0.projectlaogai.fragments

import android.graphics.Rect
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.core.content.res.ResourcesCompat
import androidx.fragment.app.Fragment
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
import kotlinx.android.synthetic.main.fragment_grades.*
import kotlinx.coroutines.*
import org.mosad.seil0.projectlaogai.R
import org.mosad.seil0.projectlaogai.controller.QISPOSParser
import org.mosad.seil0.projectlaogai.controller.preferences.EncryptedPreferences
import org.mosad.seil0.projectlaogai.uicomponents.DayCardView
import org.mosad.seil0.projectlaogai.uicomponents.GradeLinearLayout
import org.mosad.seil0.projectlaogai.uicomponents.dialogs.LoginDialog

/**
 * The grades fragment class
 * contains all needed parts to display and the grades screen
 */
class GradesFragment : Fragment() {

    private lateinit var refreshLayoutGrades: SwipeRefreshLayout

    private lateinit var parser: QISPOSParser

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val view: View = inflater.inflate(R.layout.fragment_grades, container, false)

        refreshLayoutGrades = view.findViewById(R.id.refreshLayout_Grades)
        refreshLayoutGrades.isEnabled = false // disable swipe

        parser = QISPOSParser(context!!)// init the parser

        return view
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        if (checkCredentials() && checkQisposStatus()) {
            GlobalScope.launch(Dispatchers.Default) {
                addGrades()
            }
        }
    }

    /**
     * check if the credentials are set, if not show a login dialog
     */
    private fun checkCredentials(): Boolean {
        val credentials = EncryptedPreferences.readCredentials(context!!)
        var credentialsPresent = false

        // if there is no password set, show the login dialog
        if (credentials.first.isEmpty() || credentials.second.isEmpty()) {
            LoginDialog(this.context!!)
                .positiveButton {
                    EncryptedPreferences.saveCredentials(email, password, context)
                    addGrades()
                }
                .negativeButton {
                    txtView_Loading.text = resources.getString(R.string.credentials_missing)
                }
                .show {
                    email = EncryptedPreferences.email
                    password = ""
                }
        } else {
            credentialsPresent = true
        }

        return credentialsPresent
    }

    /**
     * check if qispos is available, if not show an error
     */
    private fun checkQisposStatus(): Boolean {
        val statusCode = parser.checkQISPOSStatus()

        val infoText = resources.getString(when(statusCode) {
            503 -> R.string.qispos_unavailable
            else -> R.string.qispos_generic_error
        })

        val img = ResourcesCompat.getDrawable(resources, R.drawable.ic_error_outline_black_24dp, null)?.apply {
            bounds = Rect(0, 0, 75, 75)
        }

        txtView_Loading?.apply {
            text = infoText
            setCompoundDrawables(null, null, null, img)
        }

        return statusCode == 200
    }

    // add the grades to the layout, async
    private fun addGrades() = GlobalScope.launch(Dispatchers.Default) {
        withContext(Dispatchers.Main) {
            refreshLayout_Grades.isRefreshing = true
        }

        val grades = parser.parseGrades()

        withContext(Dispatchers.Main) {
            linLayout_Grades.removeAllViews() // clear layout
        }

        // for each semester add a new card
        grades.forEach { semester ->
            val usedSubjects = ArrayList<String>()
            val semesterCard = DayCardView(context!!)
            semesterCard.setDayHeading(semester.key)

            // for each subject add a new linLayout
            semester.value.forEachIndexed { index, subject ->
                if (usedSubjects.contains(subject.name)) {
                    return@forEachIndexed
                }

                // get the first sub subjects
                val subSubject = semester.value.firstOrNull {
                    it.name.contains(subject.name) && it.name != subject.name
                }

                // if sub subject is not null, add it to used subjects
                subSubject?.let {
                    usedSubjects.add(it.name)
                }

                val subjectLayout = GradeLinearLayout(context).set {
                    subjectName = subject.name
                    grade = subject.grade
                    subSubjectName = subSubject?.name.toString()
                    subGrade = subSubject?.grade.toString()
                }

                // disable sub-subject if not set
                if (subSubject == null)
                    subjectLayout.disableSubSubject()

                // disable divider if last element
                if (index == semester.value.lastIndex || semester.value.indexOf(subSubject) == semester.value.lastIndex)
                    subjectLayout.disableDivider()

                semesterCard.getLinLayoutDay().addView(subjectLayout)
            }

            // without context we can't access the view
            withContext(Dispatchers.Main) {
                linLayout_Grades.addView(semesterCard)
            }
        }



        val txtViewLegal = TextView(context).apply {
            text = resources.getString(R.string.without_guarantee)
            textAlignment = View.TEXT_ALIGNMENT_CENTER
        }

        // stop refreshing and show legal warning
        withContext(Dispatchers.Main) {
            linLayout_Grades.addView(txtViewLegal)
            refreshLayout_Grades.isRefreshing = false
        }
    }

}