/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package mozilla.components.feature.prompts.dialog

import android.annotation.SuppressLint
import android.app.AlertDialog
import android.app.DatePickerDialog
import android.app.Dialog
import android.app.TimePickerDialog
import android.content.DialogInterface
import android.content.DialogInterface.BUTTON_NEGATIVE
import android.content.DialogInterface.BUTTON_NEUTRAL
import android.content.DialogInterface.BUTTON_POSITIVE
import android.os.Build
import android.os.Build.VERSION_CODES.M
import android.os.Bundle
import android.text.format.DateFormat
import android.view.LayoutInflater
import android.view.View
import android.widget.DatePicker
import android.widget.TimePicker
import androidx.annotation.VisibleForTesting
import androidx.annotation.VisibleForTesting.PRIVATE
import mozilla.components.feature.prompts.R
import mozilla.components.feature.prompts.ext.day
import mozilla.components.feature.prompts.ext.hour
import mozilla.components.feature.prompts.ext.minute
import mozilla.components.feature.prompts.ext.month
import mozilla.components.feature.prompts.ext.toCalendar
import mozilla.components.feature.prompts.ext.year
import mozilla.components.feature.prompts.widget.MonthAndYearPicker
import java.util.Calendar
import java.util.Date

private const val KEY_INITIAL_DATE = "KEY_INITIAL_DATE"
private const val KEY_MIN_DATE = "KEY_MIN_DATE"
private const val KEY_MAX_DATE = "KEY_MAX_DATE"
private const val KEY_SELECTED_DATE = "KEY_SELECTED_DATE"
private const val KEY_SELECTION_TYPE = "KEY_SELECTION_TYPE"

/**
 * [DialogFragment][androidx.fragment.app.DialogFragment] implementation to display date picker with a native dialog.
 */
internal class TimePickerDialogFragment : PromptDialogFragment(), DatePicker.OnDateChangedListener,
    TimePicker.OnTimeChangedListener, TimePickerDialog.OnTimeSetListener,
    DatePickerDialog.OnDateSetListener, DialogInterface.OnClickListener,
    MonthAndYearPicker.OnDateSetListener {
    private val initialDate: Date by lazy { safeArguments.getSerializable(KEY_INITIAL_DATE) as Date }
    private val minimumDate: Date? by lazy { safeArguments.getSerializable((KEY_MIN_DATE)) as? Date }
    private val maximumDate: Date? by lazy { safeArguments.getSerializable(KEY_MAX_DATE) as? Date }
    private val selectionType: Int by lazy { safeArguments.getInt(KEY_SELECTION_TYPE) }

    @VisibleForTesting(otherwise = PRIVATE)
    internal var selectedDate: Date
        get() = safeArguments.getSerializable(KEY_SELECTED_DATE) as Date
        set(value) {
            safeArguments.putSerializable(KEY_SELECTED_DATE, value)
        }

    @Suppress("ComplexMethod")
    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val context = requireContext()
        val dialog = when (selectionType) {
            SELECTION_TYPE_TIME -> initialDate.toCalendar().let { cal ->
                TimePickerDialog(
                    context,
                    this,
                    cal.hour,
                    cal.minute,
                    DateFormat.is24HourFormat(context)
                )
            }
            SELECTION_TYPE_DATE -> initialDate.toCalendar().let { cal ->
                DatePickerDialog(
                    context,
                    this@TimePickerDialogFragment,
                    cal.year,
                    cal.month,
                    cal.day
                ).apply { setMinMaxDate(datePicker) }
            }
            SELECTION_TYPE_DATE_AND_TIME -> AlertDialog.Builder(context)
                .setView(inflateDateTimePicker(LayoutInflater.from(context)))
                .create()
                .also {
                    it.setButton(BUTTON_POSITIVE, context.getString(R.string.mozac_feature_prompts_set_date), this)
                    it.setButton(BUTTON_NEGATIVE, context.getString(R.string.mozac_feature_prompts_cancel), this)
                }
            SELECTION_TYPE_MONTH -> AlertDialog.Builder(context)
                .setTitle(R.string.mozac_feature_prompts_set_month)
                .setView(inflateDateMonthPicker())
                .create()
                .also {
                    it.setButton(BUTTON_POSITIVE, context.getString(R.string.mozac_feature_prompts_set_date), this)
                    it.setButton(BUTTON_NEGATIVE, context.getString(R.string.mozac_feature_prompts_cancel), this)
                }
            else -> throw IllegalArgumentException()
        }

        dialog.also {
            it.setCancelable(true)
            it.setButton(BUTTON_NEUTRAL, context.getString(R.string.mozac_feature_prompts_clear), this)
        }

        return dialog
    }

    /**
     * Called when the user touches outside of the dialog.
     */
    override fun onCancel(dialog: DialogInterface) {
        super.onCancel(dialog)
        onClick(dialog, BUTTON_NEGATIVE)
    }

    @SuppressLint("InflateParams")
    private fun inflateDateTimePicker(inflater: LayoutInflater): View {
        val view = inflater.inflate(R.layout.mozac_feature_prompts_date_time_picker, null)
        val datePicker = view.findViewById<DatePicker>(R.id.date_picker)
        val dateTimePicker = view.findViewById<TimePicker>(R.id.datetime_picker)
        val cal = initialDate.toCalendar()

        // Bind date picker
        setMinMaxDate(datePicker)
        datePicker.init(cal.year, cal.month, cal.day, this)
        initTimePicker(dateTimePicker, cal)

        return view
    }

    private fun inflateDateMonthPicker(): View {
        return MonthAndYearPicker(
            context = requireContext(),
            selectedDate = initialDate.toCalendar(),
            maxDate = maximumDate?.toCalendar() ?: MonthAndYearPicker.getDefaultMaxDate(),
            minDate = minimumDate?.toCalendar() ?: MonthAndYearPicker.getDefaultMinDate(),
            dateSetListener = this
        )
    }

    @Suppress("DEPRECATION")
    private fun initTimePicker(picker: TimePicker, cal: Calendar) {
        if (Build.VERSION.SDK_INT >= M) {
            picker.hour = cal.hour
            picker.minute = cal.minute
        } else {
            picker.currentHour = cal.hour
            picker.currentMinute = cal.minute
        }
        picker.setIs24HourView(DateFormat.is24HourFormat(requireContext()))
        picker.setOnTimeChangedListener(this)
    }

    private fun setMinMaxDate(datePicker: DatePicker) {
        minimumDate?.let {
            datePicker.minDate = it.time
        }
        maximumDate?.let {
            datePicker.maxDate = it.time
        }
    }

    override fun onDateChanged(view: DatePicker?, year: Int, monthOfYear: Int, dayOfMonth: Int) {
        val calendar = Calendar.getInstance()
        calendar.set(year, monthOfYear, dayOfMonth)
        selectedDate = calendar.time
    }

    override fun onDateSet(view: DatePicker?, year: Int, month: Int, dayOfMonth: Int) {
        onDateChanged(view, year, month, dayOfMonth)
        onClick(null, BUTTON_POSITIVE)
    }

    override fun onDateSet(picker: MonthAndYearPicker, month: Int, year: Int) {
        onDateChanged(null, year, month, 0)
    }

    override fun onTimeChanged(picker: TimePicker?, hourOfDay: Int, minute: Int) {
        val calendar = selectedDate.toCalendar()
        calendar.set(Calendar.HOUR_OF_DAY, hourOfDay)
        calendar.set(Calendar.MINUTE, minute)
        selectedDate = calendar.time
    }

    override fun onTimeSet(view: TimePicker?, hourOfDay: Int, minute: Int) {
        onTimeChanged(view, hourOfDay, minute)
        onClick(null, BUTTON_POSITIVE)
    }

    override fun onClick(dialog: DialogInterface?, which: Int) {
        when (which) {
            BUTTON_POSITIVE -> feature?.onConfirm(sessionId, promptRequestUID, selectedDate)
            BUTTON_NEGATIVE -> feature?.onCancel(sessionId, promptRequestUID)
            BUTTON_NEUTRAL -> feature?.onClear(sessionId, promptRequestUID)
        }
    }

    companion object {
        /**
         * A builder method for creating a [TimePickerDialogFragment]
         * @param sessionId to create the dialog.
         * @param promptRequestUID identifier of the [PromptRequest] for which this dialog is shown.
         * @param shouldDismissOnLoad whether or not the dialog should automatically be dismissed
         * when a new page is loaded.
         * @param title of the dialog.
         * @param initialDate date that will be selected by default.
         * @param minDate the minimumDate date that will be allowed to be selected.
         * @param maxDate the maximumDate date that will be allowed to be selected.
         * @param selectionType indicate which type of time should be selected, valid values are
         * ([TimePickerDialogFragment.SELECTION_TYPE_DATE], [TimePickerDialogFragment.SELECTION_TYPE_DATE_AND_TIME],
         * and [TimePickerDialogFragment.SELECTION_TYPE_TIME])
         *
         * @return a new instance of [TimePickerDialogFragment]
         */
        @Suppress("LongParameterList")
        fun newInstance(
            sessionId: String,
            promptRequestUID: String,
            shouldDismissOnLoad: Boolean,
            initialDate: Date,
            minDate: Date?,
            maxDate: Date?,
            selectionType: Int = SELECTION_TYPE_DATE
        ): TimePickerDialogFragment {
            val fragment = TimePickerDialogFragment()
            val arguments = fragment.arguments ?: Bundle()
            fragment.arguments = arguments
            with(arguments) {
                putString(KEY_SESSION_ID, sessionId)
                putString(KEY_PROMPT_UID, promptRequestUID)
                putBoolean(KEY_SHOULD_DISMISS_ON_LOAD, shouldDismissOnLoad)
                putSerializable(KEY_INITIAL_DATE, initialDate)
                putSerializable(KEY_MIN_DATE, minDate)
                putSerializable(KEY_MAX_DATE, maxDate)
                putInt(KEY_SELECTION_TYPE, selectionType)
            }
            fragment.selectedDate = initialDate
            return fragment
        }

        const val SELECTION_TYPE_DATE = 1
        const val SELECTION_TYPE_DATE_AND_TIME = 2
        const val SELECTION_TYPE_TIME = 3
        const val SELECTION_TYPE_MONTH = 4
    }
}
