package com.dano.test1

import android.content.Context
import android.view.View
import android.widget.*
import java.text.SimpleDateFormat
import java.util.*

class HandlerDateSpinner(
    private val context: Context,
    private val answers: MutableMap<String, Any>,
    private val languageID: String,
    private val goToNextQuestion: () -> Unit,
    private val goToPreviousQuestion: () -> Unit,
    private val showToast: (String) -> Unit
) : QuestionHandler {

    private lateinit var question: QuestionItem.DateSpinnerQuestion
    private lateinit var layout: View

    private lateinit var spinnerDay: Spinner
    private lateinit var spinnerMonth: Spinner
    private lateinit var spinnerYear: Spinner

    override fun bind(layout: View, question: QuestionItem) {
        if (question !is QuestionItem.DateSpinnerQuestion) return

        this.layout = layout
        this.question = question

        initViews()

        val questionTextView = layout.findViewById<TextView>(R.id.question)
        val textView = layout.findViewById<TextView>(R.id.textView)

        questionTextView.text = question.question?.let { LanguageManager.getText(languageID, it) } ?: ""
        textView.text = question.textKey?.let { LanguageManager.getText(languageID, it) } ?: ""

        val (savedYear, savedMonthIndex, savedDay) = question.question?.let {
            parseSavedDate(answers[it] as? String)
        } ?: Triple(null, null, null)

        val days = (1..31).toList()
        val months = Months.getAllMonths(languageID)
        val years = (1900..MAX_VALUE_YEAR + 1).toList().reversed()

        val today = Calendar.getInstance()
        val defaultDay = savedDay ?: today.get(Calendar.DAY_OF_MONTH)
        val defaultMonth = savedMonthIndex?.takeIf { it in months.indices }?.let { months[it] }
            ?: months[today.get(Calendar.MONTH)]
        val defaultYear = savedYear ?: today.get(Calendar.YEAR)

        setupSpinner(spinnerDay, days, defaultDay)
        setupSpinner(spinnerMonth, months, defaultMonth)
        setupSpinner(spinnerYear, years, defaultYear)

        layout.findViewById<Button>(R.id.Qnext).setOnClickListener {
            if (validate()) {
                saveAnswer()
                goToNextQuestion()
            }
        }

        layout.findViewById<Button>(R.id.Qprev).setOnClickListener {
            goToPreviousQuestion()
        }
    }

    private fun initViews() {
        spinnerDay = layout.findViewById(R.id.spinner_value_day)
        spinnerMonth = layout.findViewById(R.id.spinner_value_month)
        spinnerYear = layout.findViewById(R.id.spinner_value_year)
    }

    override fun validate(): Boolean {
        val day = spinnerDay.selectedItem.toString().padStart(2, '0')
        val month = spinnerMonth.selectedItem as Month
        val year = spinnerYear.selectedItem.toString()

        val allMonths = Months.getAllMonths(languageID)
        val monthNumber = (allMonths.indexOf(month) + 1).toString().padStart(2, '0')
        val selectedDateString = "$year-$monthNumber-$day"
        val selectedDate = parseDate(selectedDateString)

        question.constraints?.notBefore?.let { key ->
            val referenceDateString = answers[key] as? String
            val referenceDate = referenceDateString?.let { parseDate(it) }
            if (referenceDate != null && selectedDate.before(referenceDate)) {
                val message1 = LanguageManager.getText(languageID, "date_after")
                val message2 = LanguageManager.getText(languageID, "lay")
                showToast(message1 + " " + referenceDateString + " " + message2)
                return false
            }
        }

        question.constraints?.notAfter?.let { key ->
            val referenceDate = when (key) {
                "today" -> Date()
                else -> (answers[key] as? String)?.let { parseDate(it) }
            }
            if (referenceDate != null && selectedDate.after(referenceDate)) {
                val message1 = LanguageManager.getText(languageID, "date_before")
                val message2 = LanguageManager.getText(languageID, "lay")
                showToast(message1 + " " + referenceDate + " " + message2)
                return false
            }
        }

        return true
    }

    override fun saveAnswer() {
        val day = spinnerDay.selectedItem.toString().padStart(2, '0')
        val month = spinnerMonth.selectedItem as Month
        val year = spinnerYear.selectedItem.toString()

        val allMonths = Months.getAllMonths(languageID)
        val monthNumber = (allMonths.indexOf(month) + 1).toString().padStart(2, '0')

        question.question?.let { key ->
            answers[key] = "$year-$monthNumber-$day"
        }
    }

    private fun parseSavedDate(dateString: String?): Triple<Int?, Int?, Int?> {
        if (dateString.isNullOrBlank()) return Triple(null, null, null)
        val parts = dateString.split("-")
        if (parts.size != 3) return Triple(null, null, null)

        val year = parts[0].toIntOrNull()
        val monthIndex = parts[1].toIntOrNull()?.minus(1)
        val day = parts[2].toIntOrNull()

        return Triple(year, monthIndex, day)
    }

    private fun parseDate(dateString: String): Date {
        val sdf = SimpleDateFormat("yyyy-MM-dd", Locale.getDefault())
        return sdf.parse(dateString)
    }

    private fun <T> setupSpinner(spinner: Spinner, items: List<T>, defaultSelection: T?) {
        val adapter = ArrayAdapter(context, android.R.layout.simple_spinner_item, items)
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
        spinner.adapter = adapter

        defaultSelection?.let {
            val index = items.indexOf(it)
            if (index >= 0) {
                spinner.setSelection(index)
            }
        }
    }
}