package com.jttools.datacontrol.guard

import org.json.JSONArray
import org.json.JSONObject
import java.time.LocalDateTime

/** Plage pendant laquelle l'appareil est utilisable. Minutes depuis minuit ; jours ISO (1 = lundi … 7 = dimanche). */
data class TimeWindow(val days: Set<Int>, val startMin: Int, val endMin: Int)

data class AppLimit(val pkg: String, val minutes: Int)

/**
 * Règles d'usage envoyées par FamilyControl (champ `rules` de la config distante).
 * Les temps s'entendent par jour ; le bonus n'est valable que le jour [bonusDate].
 */
data class Rules(
    val scheduleEnabled: Boolean = false,
    val scheduleCutsMobile: Boolean = true,
    val windows: List<TimeWindow> = emptyList(),
    val dailyLimitMin: Int = 0,
    val appLimits: List<AppLimit> = emptyList(),
    val blocked: Set<String> = emptySet(),
    val bonusDate: String? = null,
    val bonusGlobalMin: Int = 0,
    val bonusApps: List<AppLimit> = emptyList()
) {
    val isEmpty: Boolean
        get() = !scheduleEnabled && dailyLimitMin <= 0 && appLimits.isEmpty() && blocked.isEmpty()

    /** Vrai si [now] tombe dans une plage autorisée (une plage qui passe minuit déborde sur le lendemain). */
    fun isOpenAt(now: LocalDateTime): Boolean {
        val dow = now.dayOfWeek.value
        val prev = if (dow == 1) 7 else dow - 1
        val minute = now.hour * 60 + now.minute
        return windows.any { w ->
            if (w.startMin <= w.endMin) dow in w.days && minute >= w.startMin && minute < w.endMin
            else (dow in w.days && minute >= w.startMin) || (prev in w.days && minute < w.endMin)
        }
    }

    /** Heure de la prochaine ouverture, en texte (« Reprise à 08:00. »), ou "" s'il n'y en a pas. */
    fun nextOpeningText(now: LocalDateTime): String {
        val minute = now.hour * 60 + now.minute
        for (offset in 0..7) {
            val dow = ((now.dayOfWeek.value - 1 + offset) % 7) + 1
            val start = windows.filter { dow in it.days && (offset > 0 || it.startMin > minute) }
                .minOfOrNull { it.startMin } ?: continue
            val label = "%02d:%02d".format(start / 60, start % 60)
            return if (offset == 0) "Reprise à $label." else "Reprise à $label (dans $offset j)."
        }
        return ""
    }

    companion object {
        val NONE = Rules()

        fun parse(json: String?): Rules {
            if (json.isNullOrBlank()) return NONE
            return runCatching {
                val o = JSONObject(json)
                val sch = o.optJSONObject("schedule")
                val bonus = o.optJSONObject("bonus")
                Rules(
                    scheduleEnabled = sch?.optBoolean("enabled", false) ?: false,
                    scheduleCutsMobile = sch?.optBoolean("cutsMobile", true) ?: true,
                    windows = sch?.optJSONArray("windows").objects().map { w ->
                        TimeWindow(
                            days = w.optJSONArray("days").ints().toSet(),
                            startMin = w.optInt("start", 0),
                            endMin = w.optInt("end", 0)
                        )
                    },
                    dailyLimitMin = o.optInt("dailyLimitMin", 0),
                    appLimits = o.optJSONArray("appLimits").objects().map { AppLimit(it.optString("pkg"), it.optInt("min")) },
                    blocked = o.optJSONArray("blocked").strings().toSet(),
                    bonusDate = bonus?.optString("date")?.takeIf { it.isNotEmpty() },
                    bonusGlobalMin = bonus?.optInt("globalMin", 0) ?: 0,
                    bonusApps = bonus?.optJSONArray("apps").objects().map { AppLimit(it.optString("pkg"), it.optInt("min")) }
                )
            }.getOrDefault(NONE)
        }

        private fun JSONArray?.objects(): List<JSONObject> =
            if (this == null) emptyList() else (0 until length()).mapNotNull { optJSONObject(it) }

        private fun JSONArray?.ints(): List<Int> =
            if (this == null) emptyList() else (0 until length()).map { optInt(it) }

        private fun JSONArray?.strings(): List<String> =
            if (this == null) emptyList() else (0 until length()).map { optString(it) }
    }
}