package com.tt.honeyDue.notifications

/**
 * Structured representation of a Firebase Cloud Messaging data-payload for
 * iOS-parity notification types (task_reminder, task_overdue, residence_invite,
 * subscription).
 *
 * Mirrors the iOS `PushNotificationManager.swift` userInfo handling. The
 * backend sends a `data` map only (no `notification` field) so we can always
 * deliver actionable payloads regardless of app foreground state.
 */
data class NotificationPayload(
    val type: String,
    val taskId: Long?,
    val residenceId: Long?,
    val title: String,
    val body: String,
    val deepLink: String?
) {
    companion object {
        // Keys used by the backend. Kept in a single place so they can be updated
        // in lockstep with the Go API `internal/notification/` constants.
        private const val KEY_TYPE = "type"
        private const val KEY_TASK_ID = "task_id"
        private const val KEY_RESIDENCE_ID = "residence_id"
        private const val KEY_TITLE = "title"
        private const val KEY_BODY = "body"
        private const val KEY_DEEP_LINK = "deep_link"

        /**
         * Parse a raw FCM data map into a [NotificationPayload], or null if the
         * payload is missing the minimum required fields (type + at least one of
         * title/body). Numeric id fields that fail to parse are treated as null
         * (rather than failing the whole payload) so we still surface the text.
         */
        fun parse(data: Map<String, String>): NotificationPayload? {
            val type = data[KEY_TYPE]?.takeIf { it.isNotBlank() } ?: return null
            val title = data[KEY_TITLE]?.takeIf { it.isNotBlank() }
            val body = data[KEY_BODY]?.takeIf { it.isNotBlank() }
            // Require at least one of title/body, otherwise there's nothing to show.
            if (title == null && body == null) return null

            return NotificationPayload(
                type = type,
                taskId = data[KEY_TASK_ID]?.toLongOrNull(),
                residenceId = data[KEY_RESIDENCE_ID]?.toLongOrNull(),
                title = title ?: "",
                body = body ?: "",
                deepLink = data[KEY_DEEP_LINK]?.takeIf { it.isNotBlank() }
            )
        }
    }
}