Node / meshtastic / Meshtastic-Android / files / androidApp / src / google / kotlin / org / meshtastic / app / discovery / GeminiNanoSummaryProvider.kt

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T8b949e/*

* Copyright (c) 2026 Meshtastic LLC

*

* 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.

*

* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.

*/

Tff7b72package T7ee787org.meshtastic.app.discovery

Tff7b72import T7ee787co.touchlab.kermit.Logger

Tff7b72import T7ee787com.google.mlkit.genai.prompt.Generation

Tff7b72import T7ee787com.google.mlkit.genai.prompt.GenerativeModel

Tff7b72import T7ee787com.google.mlkit.genai.prompt.TextPart

Tff7b72import T7ee787com.google.mlkit.genai.prompt.generateContentRequest

Tff7b72import T7ee787org.meshtastic.core.database.entity.DiscoveryPresetResultEntity

Tff7b72import T7ee787org.meshtastic.core.database.entity.DiscoverySessionEntity

Tff7b72import T7ee787org.meshtastic.feature.discovery.DiscoverySummaryGenerator

Tff7b72import T7ee787org.meshtastic.feature.discovery.ai.DiscoverySummaryAiProvider

T8b949e/**

* Google-flavor provider that uses Gemini Nano via the ML Kit GenAI Prompt API for on-device AI summaries.

*

* Lives in the Google flavor source set (not the shared `:feature:discovery` module) so the proprietary ML Kit GenAI

* dependency never reaches the F-Droid build. The F-Droid flavor binds

* [org.meshtastic.feature.discovery.ai. AlgorithmicSummaryProvider] instead.

*

* Falls back to [DiscoverySummaryGenerator] when:

* - The on-device model is unavailable (unsupported hardware or not downloaded)

* - Generation fails for any reason

*/

Tff7b72class T56d364GeminiNanoSummaryProviderTb4b4b4(Tff7b72private Tff7b72val Te6edf3generatorTb4b4b4: Te6edf3DiscoverySummaryGeneratorTb4b4b4) Tb4b4b4: Te6edf3DiscoverySummaryAiProvider Tb4b4b4{

Tff7b72private Tff7b72val Te6edf3log Tff7b72= Te6edf3LoggerTb4b4b4.Te6edf3withTagTb4b4b4(Ta5d6ff"Ta5d6ffGeminiNanoSummaryTa5d6ff"Tb4b4b4)

Tff7b72private Tff7b72val Te6edf3generativeModelTb4b4b4: Te6edf3GenerativeModel? Tff7b72by Te6edf3lazy Tb4b4b4{

Tf0883e@SuppressTb4b4b4(Ta5d6ff"Ta5d6ffTooGenericExceptionCaughtTa5d6ff"Tb4b4b4) T8b949e// ML Kit throws undocumented RuntimeExceptions

Tff7b72try Tb4b4b4{

Te6edf3GenerationTb4b4b4.Te6edf3getClientTb4b4b4(Tb4b4b4)

Tb4b4b4} Tff7b72catch Tb4b4b4(Te6edf3eTb4b4b4: Te6edf3ExceptionTb4b4b4) Tb4b4b4{

Te6edf3logTb4b4b4.Te6edf3wTb4b4b4(Te6edf3eTb4b4b4) Tb4b4b4{ Ta5d6ff"Ta5d6ffFailed to get GenerativeModel clientTa5d6ff" Tb4b4b4}

Tff7b72null

Tb4b4b4}

Tb4b4b4}

Tff7b72override Tff7b72val Te6edf3isAvailableTb4b4b4: Tffa657Boolean

Tff7b72getTb4b4b4(Tb4b4b4) Tff7b72= Te6edf3checkAvailabilityTb4b4b4(Tb4b4b4)

Tff7b72override Tff7b72suspend Tff7b72fun Td2a8ffgenerateSessionSummaryTb4b4b4(

Te6edf3sessionTb4b4b4: Te6edf3DiscoverySessionEntityTb4b4b4,

Te6edf3presetResultsTb4b4b4: Te6edf3ListTff7b72<Te6edf3DiscoveryPresetResultEntityTff7b72>Tb4b4b4,

Tb4b4b4)Tb4b4b4: Tffa657String Tb4b4b4{

Tff7b72val Te6edf3model Tff7b72= Te6edf3generativeModel

Tff7b72if Tb4b4b4(Te6edf3model Tff7b72=Tff7b72= Tff7b72null Tff7b72|Tff7b72| Tff7b72!Te6edf3isAvailableTb4b4b4) Tb4b4b4{

Te6edf3logTb4b4b4.Te6edf3d Tb4b4b4{ Ta5d6ff"Ta5d6ffGemini Nano unavailable, using algorithmic fallbackTa5d6ff" Tb4b4b4}

Tff7b72return Te6edf3generatorTb4b4b4.Te6edf3generateSessionSummaryTb4b4b4(Te6edf3sessionTb4b4b4, Te6edf3presetResultsTb4b4b4)

Tb4b4b4}

Tff7b72val Te6edf3prompt Tff7b72= Te6edf3generatorTb4b4b4.Te6edf3buildSessionPromptTb4b4b4(Te6edf3sessionTb4b4b4, Te6edf3presetResultsTb4b4b4)

Tff7b72return Te6edf3generateOrFallbackTb4b4b4(Te6edf3modelTb4b4b4, Te6edf3promptTb4b4b4) Tb4b4b4{ Te6edf3generatorTb4b4b4.Te6edf3generateSessionSummaryTb4b4b4(Te6edf3sessionTb4b4b4, Te6edf3presetResultsTb4b4b4) Tb4b4b4}

Tb4b4b4}

Tff7b72override Tff7b72suspend Tff7b72fun Td2a8ffgeneratePresetSummaryTb4b4b4(Te6edf3resultTb4b4b4: Te6edf3DiscoveryPresetResultEntityTb4b4b4)Tb4b4b4: Tffa657String Tb4b4b4{

Tff7b72val Te6edf3model Tff7b72= Te6edf3generativeModel

Tff7b72if Tb4b4b4(Te6edf3model Tff7b72=Tff7b72= Tff7b72null Tff7b72|Tff7b72| Tff7b72!Te6edf3isAvailableTb4b4b4) Tb4b4b4{

Tff7b72return Te6edf3generatorTb4b4b4.Te6edf3generatePresetSummaryTb4b4b4(Te6edf3resultTb4b4b4)

Tb4b4b4}

Tff7b72val Te6edf3prompt Tff7b72= Te6edf3generatorTb4b4b4.Te6edf3buildPresetPromptTb4b4b4(Te6edf3resultTb4b4b4)

Tff7b72return Te6edf3generateOrFallbackTb4b4b4(Te6edf3modelTb4b4b4, Te6edf3promptTb4b4b4) Tb4b4b4{ Te6edf3generatorTb4b4b4.Te6edf3generatePresetSummaryTb4b4b4(Te6edf3resultTb4b4b4) Tb4b4b4}

Tb4b4b4}

Tff7b72private Tff7b72suspend Tff7b72fun Td2a8ffgenerateOrFallbackTb4b4b4(Te6edf3modelTb4b4b4: Te6edf3GenerativeModelTb4b4b4, Te6edf3promptTb4b4b4: Tffa657StringTb4b4b4, Te6edf3fallbackTb4b4b4: Tb4b4b4(Tb4b4b4) Tff7b72-Tff7b72> Tffa657StringTb4b4b4)Tb4b4b4: Tffa657String Tff7b72=

Tff7b72try Tb4b4b4{

Tff7b72val Te6edf3request Tff7b72=

Te6edf3generateContentRequestTb4b4b4(Te6edf3TextPartTb4b4b4(Te6edf3promptTb4b4b4)Tb4b4b4) Tb4b4b4{

Te6edf3temperature Tff7b72= Te6edf3TEMPERATURE

Te6edf3topK Tff7b72= Te6edf3TOP_K

Te6edf3maxOutputTokens Tff7b72= Te6edf3MAX_OUTPUT_TOKENS

Tb4b4b4}

Tff7b72val Te6edf3response Tff7b72= Te6edf3modelTb4b4b4.Te6edf3generateContentTb4b4b4(Te6edf3requestTb4b4b4)

Tff7b72val Te6edf3text Tff7b72= Te6edf3responseTb4b4b4.Te6edf3candidatesTb4b4b4.Te6edf3firstOrNullTb4b4b4(Tb4b4b4)Tff7b72?.Te6edf3text

Tff7b72if Tb4b4b4(Te6edf3textTb4b4b4.Te6edf3isNullOrBlankTb4b4b4(Tb4b4b4)Tb4b4b4) Tb4b4b4{

Te6edf3logTb4b4b4.Te6edf3w Tb4b4b4{ Ta5d6ff"Ta5d6ffGemini Nano returned empty response, using fallbackTa5d6ff" Tb4b4b4}

Te6edf3fallbackTb4b4b4(Tb4b4b4)

Tb4b4b4} Tff7b72else Tb4b4b4{

Te6edf3text

Tb4b4b4}

Tb4b4b4} Tff7b72catch Tb4b4b4(Tf0883e@SuppressTb4b4b4(Ta5d6ff"Ta5d6ffTooGenericExceptionCaughtTa5d6ff"Tb4b4b4) Te6edf3eTb4b4b4: Te6edf3ExceptionTb4b4b4) Tb4b4b4{

Te6edf3logTb4b4b4.Te6edf3wTb4b4b4(Te6edf3eTb4b4b4) Tb4b4b4{ Ta5d6ff"Ta5d6ffGemini Nano generation failed, using fallbackTa5d6ff" Tb4b4b4}

Te6edf3fallbackTb4b4b4(Tb4b4b4)

Tb4b4b4}

Tff7b72private Tff7b72fun Td2a8ffcheckAvailabilityTb4b4b4(Tb4b4b4)Tb4b4b4: Tffa657Boolean Tff7b72= Tff7b72try Tb4b4b4{

T8b949e// FeatureStatus is an IntDef — check synchronously via the lazy model field.

T8b949e// Note: checkStatus() is suspend in the API; we use a non-suspend heuristic here

T8b949e// by catching and falling back if unavailable. The actual availability is confirmed

T8b949e// in generateOrFallback when the suspend call succeeds.

Te6edf3generativeModel Tff7b72!Tff7b72= Tff7b72null

Tb4b4b4} Tff7b72catch Tb4b4b4(Te6edf3_Tb4b4b4: Te6edf3ExceptionTb4b4b4) Tb4b4b4{

Tff7b72false

Tb4b4b4}

Tff7b72private Tff7b72companion Tff7b72object Tb4b4b4{

Tff7b72const Tff7b72val Te6edf3TEMPERATURE Tff7b72= T79c0ff0.3f

Tff7b72const Tff7b72val Te6edf3TOP_K Tff7b72= T79c0ff1T79c0ff6

Tff7b72const Tff7b72val Te6edf3MAX_OUTPUT_TOKENS Tff7b72= T79c0ff2T79c0ff0T79c0ff0

Tb4b4b4}

Tb4b4b4}