/* Copyright 2019 Conny Duck
 *
 * This file is a part of Tusky.
 *
 * 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.
 *
 * Tusky 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 Tusky; if not,
 * see <http://www.gnu.org/licenses>. */

package com.keylesspalace.tusky.viewdata

import android.content.Context
import android.text.SpannableStringBuilder
import android.text.Spanned
import androidx.core.text.parseAsHtml
import com.keylesspalace.tusky.R
import com.keylesspalace.tusky.entity.Poll
import com.keylesspalace.tusky.entity.PollOption
import java.util.Date
import kotlin.math.roundToInt

data class PollViewData(
    val id: String,
    val expiresAt: Date?,
    val expired: Boolean,
    val multiple: Boolean,
    val votesCount: Int,
    val votersCount: Int?,
    val options: List<PollOptionViewData>,
    var voted: Boolean
)

data class PollOptionViewData(
    val title: String,
    var votesCount: Int,
    var selected: Boolean,
    var voted: Boolean
)

fun calculatePercent(fraction: Int, totalVoters: Int?, totalVotes: Int): Int {
    return if (fraction == 0) {
        0
    } else {
        val total = totalVoters ?: totalVotes
        (fraction / total.toDouble() * 100).roundToInt()
    }
}

fun buildDescription(title: String, percent: Int, voted: Boolean, context: Context): Spanned {
    val builder = SpannableStringBuilder(context.getString(R.string.poll_percent_format, percent).parseAsHtml())
    if (voted) {
        builder.append(" ✓ ")
    } else {
        builder.append(" ")
    }
    return builder.append(title)
}

fun Poll?.toViewData(): PollViewData? {
    if (this == null) return null
    return PollViewData(
        id = id,
        expiresAt = expiresAt,
        expired = expired,
        multiple = multiple,
        votesCount = votesCount,
        votersCount = votersCount,
        options = options.mapIndexed { index, option -> option.toViewData(ownVotes?.contains(index) == true) },
        voted = voted,
    )
}

fun PollOption.toViewData(voted: Boolean): PollOptionViewData {
    return PollOptionViewData(
        title = title,
        votesCount = votesCount,
        selected = false,
        voted = voted
    )
}
