feat(app): add the entry view model and the OTP period

Totp now carries its period, so the entry view can draw how much of the
code's lifetime is left. EntryFields groups a decrypted entry the way the
spec lays it out.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/app/src/main/java/app/passwordstore/ui/entry/EntryModel.kt b/app/src/main/java/app/passwordstore/ui/entry/EntryModel.kt
new file mode 100644
index 00000000..8dbc9eb9
--- /dev/null
+++ b/app/src/main/java/app/passwordstore/ui/entry/EntryModel.kt
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package app.passwordstore.ui.entry
+
+import androidx.compose.runtime.Immutable
+import app.passwordstore.data.passfile.PasswordEntry
+import app.passwordstore.data.passfile.Totp
+import kotlinx.collections.immutable.ImmutableList
+import kotlinx.collections.immutable.toImmutableList
+
+/**
+ * What the entry view shows. [password] and [username] open the first group (the one-time code
+ * joins them from the entry's TOTP flow); [extras] are the remaining `key: value` lines in file
+ * order, plus lines that are not `key: value` under the parser's "Extra Content" key. Blank values
+ * are null, so their rows are not shown.
+ */
+@Immutable
+data class EntryFields(
+  val password: String?,
+  val username: String?,
+  val extras: ImmutableList<Pair<String, String>>,
+)
+
+fun entryFields(entry: PasswordEntry): EntryFields =
+  EntryFields(
+    password = entry.password?.takeIf { it.isNotBlank() },
+    username = entry.username?.takeIf { it.isNotBlank() },
+    extras = entry.extraContent.toList().toImmutableList(),
+  )
+
+/** Share of the code's lifetime left: 1 right after it was generated, toward 0 at expiry. */
+fun Totp.fractionLeft(): Float = (remainingTime / period).toFloat()