' ============================================================
' WALKGUIDE — DESIGN PATTERNS (GoF)
' Flutter × Spring Boot × In-Device AI
' Pattern 6 of 7: STRATEGY (Behavioral)
' ============================================================

@startuml WalkGuide_06_Strategy

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skinparam note {
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' ============================================================
' PATTERN 6 — STRATEGY (Behavioral)
' ============================================================

package "⑥  Strategy Pattern  [Behavioral]" #E8F5E9 {

    interface "ObstacleAlertStrategy\n<<Strategy>>" as AlertStrategy {
        + alert(DetectionResult result) : void
    }

    class "TtsOnlyStrategy\n<<ConcreteStrategy>>" as TtsOnly {
        - _ttsService : TtsService
        + alert(result) : void
        ' TTS: "Caution! {label} {direction}. {distance}."
    }

    class "TtsWithHapticStrategy\n<<ConcreteStrategy>>" as TtsHaptic {
        - _ttsService : TtsService
        - _hapticService : HapticService
        + alert(result) : void
        ' TTS + vibration pattern
    }

    class "HapticOnlyStrategy\n<<ConcreteStrategy>>" as HapticOnly {
        - _hapticService : HapticService
        + alert(result) : void
        ' Vibration only (silent environment)
    }

    class "ObstacleAnalyzer\n<<Context>>" as ObstacleAnalyzerCtx {
        - _strategy : ObstacleAlertStrategy
        - _aiConfig : AiConfig
        + setStrategy(ObstacleAlertStrategy)
        + analyze(List<DetectionResult>) : void
        + prioritize(results) : DetectionResult
        + calculateDirection(bbox) : Direction
    }

    class "AiConfig\n<<Config>>" as AiConfigStrategy {
        + alertMode : AlertMode
        + confidenceThreshold : double
        + maxInferenceFps : int
        + enabledLabels : List<String>
    }

    AlertStrategy <|.. TtsOnly : implements
    AlertStrategy <|.. TtsHaptic : implements
    AlertStrategy <|.. HapticOnly : implements
    ObstacleAnalyzerCtx --> AlertStrategy : uses
    ObstacleAnalyzerCtx ..> AiConfigStrategy : reads alertMode\nto select strategy
}

note right of ObstacleAnalyzerCtx
  Guardian dapat ganti strategy dari dashboard:
  alertMode = TTS_ONLY | TTS_HAPTIC | HAPTIC_ONLY
  PUT /api/v1/guardian/ai-config
  Strategy dipilih runtime tanpa ubah kode utama.
end note

@enduml