create mapper functions

app/src/main/java/com/bitcointxoko/gudariwallet/data/model/PaymentFeedItemMapper.kt

@@ -0,0 +1,72 @@
+package com.bitcointxoko.gudariwallet.data.model
+
+import com.bitcointxoko.gudariwallet.api.PaymentRecord
+import com.bitcointxoko.gudariwallet.data.db.ContactEntity
+
+// Placeholder preimage that LNbits returns when the real one isn't available yet
+private const val PREIMAGE_PLACEHOLDER = "0000000000000000000000000000000000000000000000000000000000000000"
+
+// ── ContactEntity → ContactSummary ───────────────────────────────────────────
+
+fun ContactEntity.toContactSummary(): ContactSummary = ContactSummary(
+    id = id,
+    displayName = localAlias
+        ?: displayName
+        ?: name
+        ?: id   // last resort — never shown as empty
+)
+
+// ── PaymentRecord → PaymentFeedItem ──────────────────────────────────────────
+
+fun PaymentRecord.toPaymentFeedItem(
+    linkedContacts: List<ContactSummary>,
+    resolvedAlias: String?,          // from NodeAliasCache; fallback to payment.alias handled here
+    fiatCurrency: String?,
+    fiatSatsPerUnit: Double?
+): PaymentFeedItem {
+
+    val isOutgoing = amountMsat < 0
+
+    return PaymentFeedItem(
+
+        // ── Identity ─────────────────────────────────────────────────────────
+        id = paymentHash,
+
+        // ── Row ──────────────────────────────────────────────────────────────
+        isOutgoing = isOutgoing,
+        amountSat = Math.abs(amountMsat) / 1000L,
+        memo = memo,
+        contactName = linkedContacts.firstOrNull()?.displayName,
+        createdAt = createdAt,
+        time = time.toLongOrNull(),
+        isPending = pending,
+        isFailed = status == "failed",
+        fiatCurrency = fiatCurrency,
+        fiatSatsPerUnit = fiatSatsPerUnit,
+
+        // ── Filter / search keys ─────────────────────────────────────────────
+        paymentHash = paymentHash,
+        tag = extra?.tag,
+        contactIds = linkedContacts.map { it.id }.toSet(),
+
+        // ── Detail — amounts ─────────────────────────────────────────────────
+        feeSat = if (feeMsat != 0L) Math.abs(feeMsat) / 1000L else null,
+
+        // ── Detail — contacts ────────────────────────────────────────────────
+        linkedContacts = linkedContacts,
+
+        // ── Detail — basic info ──────────────────────────────────────────────
+        comment = extra?.comment,
+
+        // ── Detail — LNURL success action ────────────────────────────────────
+        successActionMessage = extra?.successAction?.message,
+        successActionUrl = extra?.successAction?.url,
+        successActionDescription = extra?.successAction?.description,
+
+        // ── Detail — technical ───────────────────────────────────────────────
+        preimage = preimage?.takeIf { it != PREIMAGE_PLACEHOLDER },
+        pubkey = pubkey,
+        alias = resolvedAlias ?: alias,   // live cache first, snapshot fallback
+        bolt11 = bolt11,
+    )
+}