@startuml
skinparam style strictuml
skinparam defaultFontName "DM Sans"
skinparam defaultFontSize 14
skinparam titleFontName "Volkhov"
skinparam titleFontSize 20
skinparam backgroundColor #FAFCF9
skinparam defaultFontColor #28342A
skinparam titleFontColor #28342A
skinparam ArrowColor #628A5B

skinparam class {
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  ArrowColor #628A5B
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skinparam note {
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  BorderColor #547461
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}

skinparam package {
  BackgroundColor #F2F6F0
  BorderColor #547461
  FontColor #28342A
}

title The Biergarten Data Pipeline — Architecture v4 (Unified Orchestrator)

' ─────────────────────────────────────────────
' DOMAIN: VALUE OBJECTS
' ─────────────────────────────────────────────
package "Domain: Value Objects & Contracts" {

  class Location {
    + city : std::string
    + state_province : std::string
    + iso3166_2 : std::string
    + country : std::string
    + iso3166_1 : std::string
    + local_languages : std::vector<std::string>
    + latitude : double
    + longitude : double
  }

  class LocationContext {
    + text : std::string
    + completeness : Completeness
    + char_count : size_t
    --
    <<enum>> Completeness
    Full
    Partial
    Absent
  }

  class EnrichedCity {
    + location : Location
    + context : LocationContext
  }

  class BreweryResult {
    + name_en : std::string
    + description_en : std::string
    + name_local : std::string
    + description_local : std::string
  }

  class BeerResult {
    + name_en : std::string
    + description_en : std::string
    + name_local : std::string
    + description_local : std::string
    + style : std::string
    + abv : float
    + ibu : int
  }

  class UserResult {
    + username : std::string
    + bio : std::string
    + activity_weight : float
  }
  note right of UserResult
    activity_weight assigned by
    ICheckinDistributionStrategy
    after the full user pool is
    committed. Drives J-curve
    checkin volume per user.
  end note

  class CheckinResult {
    + checked_in_at : std::string
    + note : std::string
  }

  class RatingResult {
    + score : float
    + note : std::string
  }

  class GeneratedBrewery {
    + brewery_id : sqlite3_int64
    + location : Location
    + brewery : BreweryResult
    + context_completeness : LocationContext::Completeness
    + generated_at : std::string
  }

  class GeneratedBeer {
    + beer_id : sqlite3_int64
    + brewery_id : sqlite3_int64
    + location : Location
    + beer : BeerResult
    + generated_at : std::string
  }

  class GeneratedUser {
    + user_id : sqlite3_int64
    + location : Location
    + user : UserResult
    + generated_at : std::string
  }

  class GeneratedCheckin {
    + checkin_id : sqlite3_int64
    + user_id : sqlite3_int64
    + brewery_id : sqlite3_int64
    + checkin : CheckinResult
    + generated_at : std::string
  }

  class GeneratedRating {
    + user_id : sqlite3_int64
    + beer_id : sqlite3_int64
    + checkin_id : sqlite3_int64
    + rating : RatingResult
    + generated_at : std::string
  }

}

' ─────────────────────────────────────────────
' DOMAIN POLICY
' ─────────────────────────────────────────────
package "Domain Policy" {

  interface IContextStrategy <<interface>> {
    + QueriesFor(loc : const Location&) : std::vector<std::string>
    + MaxContextChars() : size_t
  }

  class BreweryContextStrategy {
    + QueriesFor(loc : const Location&) : std::vector<std::string>
    + MaxContextChars() : size_t
  }

  class BeerContextStrategy {
    + QueriesFor(loc : const Location&) : std::vector<std::string>
    + MaxContextChars() : size_t
  }

  interface ISamplingStrategy <<interface>> {
    + Sample(locations : const std::vector<Location>&) : std::vector<Location>
  }

  class UniformSamplingStrategy {
    - sample_size_ : size_t
    + Sample(locations : const std::vector<Location>&) : std::vector<Location>
  }

  interface ICheckinDistributionStrategy <<interface>> {
    + AssignActivityWeights(users : std::vector<GeneratedUser>&) : void
    + CheckinsForUser(user : const GeneratedUser&, brewery_count : size_t) : size_t
    + TimestampFor(user : const GeneratedUser&, index : size_t) : std::string
  }
  note right of ICheckinDistributionStrategy
    Injected into the orchestrator.
    Owns all statistical policy:
    J-curve weight assignment,
    bursty weekend timestamps,
    per-user checkin volume.
    No mediator required to hold this —
    the orchestrator calls it directly
    before the checkin phase opens.
  end note

  class JCurveCheckinStrategy {
    - rng_ : std::mt19937
    + AssignActivityWeights(users : std::vector<GeneratedUser>&) : void
    + CheckinsForUser(user : const GeneratedUser&, brewery_count : size_t) : size_t
    + TimestampFor(user : const GeneratedUser&, index : size_t) : std::string
  }

}

' ─────────────────────────────────────────────
' INFRASTRUCTURE: ENRICHMENT
' ─────────────────────────────────────────────
package "Infrastructure: Enrichment" {

  interface IEnrichmentService <<interface>> {
    + GetLocationContext(loc : const Location&, strategy : const IContextStrategy&) : LocationContext
  }

  class WikipediaService {
    - client_ : std::unique_ptr<WebClient>
    - extract_cache_ : std::unordered_map<std::string, std::string>
    + GetLocationContext(loc : const Location&, strategy : const IContextStrategy&) : LocationContext
    - FetchExtract(query : std::string_view) : std::string
  }

  interface WebClient <<interface>> {
    + Get(url : const std::string&) : std::string
    + UrlEncode(value : const std::string&) : std::string
  }

  class CURLWebClient {
    + Get(url : const std::string&) : std::string
    + UrlEncode(value : const std::string&) : std::string
  }

}

' ─────────────────────────────────────────────
' INFRASTRUCTURE: GENERATION
' ─────────────────────────────────────────────
package "Infrastructure: Generation" {

  interface DataGenerator <<interface>> {
    + GenerateBrewery(location : const Location&, context : const LocationContext&) : BreweryResult
    + GenerateBeer(brewery_id : sqlite3_int64, location : const Location&, context : const LocationContext&) : BeerResult
    + GenerateUser(location : const Location&) : UserResult
    + GenerateCheckin(user : const GeneratedUser&, brewery : const GeneratedBrewery&, timestamp : const std::string&) : CheckinResult
    + GenerateRating(user : const GeneratedUser&, beer : const GeneratedBeer&, checkin_id : sqlite3_int64) : RatingResult
  }

  class MockGenerator {
    + GenerateBrewery(...) : BreweryResult
    + GenerateBeer(...) : BeerResult
    + GenerateUser(...) : UserResult
    + GenerateCheckin(...) : CheckinResult
    + GenerateRating(...) : RatingResult
    - DeterministicHash(location : const Location&) : size_t
  }

  class LlamaGenerator {
    - model_ : ModelHandle
    - context_ : ContextHandle
    - prompt_formatter_ : std::unique_ptr<IPromptFormatter>
    - config_ : LlamaConfig
    - rng_ : std::mt19937
    + GenerateBrewery(...) : BreweryResult
    + GenerateBeer(...) : BeerResult
    + GenerateUser(...) : UserResult
    + GenerateCheckin(...) : CheckinResult
    + GenerateRating(...) : RatingResult
    - Load(config : const LlamaConfig&) : void
    - Infer(system_prompt, user_prompt, max_tokens, grammar) : std::string
    - ValidateModelArchitecture() : void
  }

  class RestGenerator {
    - config_ : RestConfig
    + GenerateBrewery(...) : BreweryResult
    + GenerateBeer(...) : BeerResult
    + GenerateUser(...) : UserResult
    + GenerateCheckin(...) : CheckinResult
    + GenerateRating(...) : RatingResult
  }
  note right of RestGenerator
    Future REST-backed implementation.
    Slots in at the DI root with zero
    changes to orchestration logic.
  end note

  interface IPromptFormatter <<interface>> {
    + Format(system_prompt : std::string_view, user_prompt : std::string_view) : std::string
    + ExpectedArchitecture() : std::string_view
  }

  class Gemma4JinjaPromptFormatter {
    + Format(...) : std::string
    + ExpectedArchitecture() : std::string_view
  }

  class LlamaConfig {
    + model_path : std::string
    + temperature : float
    + top_p : float
    + top_k : uint32_t
    + n_ctx : uint32_t
    + seed : int
  }

  class RestConfig {
    + endpoint : std::string
    + api_key : std::string
    + timeout : std::chrono::milliseconds
  }

}

' ─────────────────────────────────────────────
' INFRASTRUCTURE: PIPELINE CHANNEL
' ─────────────────────────────────────────────
package "Infrastructure: Pipeline Channel" {

  class "BoundedChannel<T>" as BoundedChannel {
    - queue_ : std::queue<T>
    - mutex_ : std::mutex
    - not_full_ : std::condition_variable
    - not_empty_ : std::condition_variable
    - capacity_ : size_t
    - closed_ : bool
    + Send(item : T) : void
    + Receive() : std::optional<T>
    + Close() : void
  }
  note right of BoundedChannel
    Used within each phase to
    decouple production from export.
    Phase boundaries are explicit
    sequential barriers in the
    orchestrator's Run() method —
    not channel-mediated.
  end note

}

' ─────────────────────────────────────────────
' INFRASTRUCTURE: EXPORT
' ─────────────────────────────────────────────
package "Infrastructure: Export" {

  interface IExportService <<interface>> {
    + Initialize() : void
    + ProcessBrewery(brewery : const GeneratedBrewery&) : sqlite3_int64
    + ProcessBeer(beer : const GeneratedBeer&) : sqlite3_int64
    + ProcessUser(user : const GeneratedUser&) : sqlite3_int64
    + ProcessCheckin(checkin : const GeneratedCheckin&) : sqlite3_int64
    + ProcessRating(rating : const GeneratedRating&) : void
    + Finalize() : void
  }
  note right of IExportService
    Process* methods return
    sqlite3_int64 row IDs.
    Orchestrator uses these to
    populate FK fields on all
    downstream fixture types.
  end note

  class SqliteExportService {
    - date_time_provider_ : std::unique_ptr<IDateTimeProvider>
    - db_handle_ : SqliteDatabaseHandle
    - insert_location_stmt_ : SqliteStatementHandle
    - insert_brewery_stmt_ : SqliteStatementHandle
    - insert_beer_stmt_ : SqliteStatementHandle
    - insert_user_stmt_ : SqliteStatementHandle
    - insert_checkin_stmt_ : SqliteStatementHandle
    - insert_rating_stmt_ : SqliteStatementHandle
    - transaction_open_ : bool
    - location_cache_ : std::unordered_map<std::string, sqlite3_int64>
    + Initialize() : void
    + ProcessBrewery(brewery : const GeneratedBrewery&) : sqlite3_int64
    + ProcessBeer(beer : const GeneratedBeer&) : sqlite3_int64
    + ProcessUser(user : const GeneratedUser&) : sqlite3_int64
    + ProcessCheckin(checkin : const GeneratedCheckin&) : sqlite3_int64
    + ProcessRating(rating : const GeneratedRating&) : void
    + Finalize() : void
    - InitializeSchema() : void
    - PrepareStatements() : void
    - RollbackAndCloseNoThrow() : void
    - FinalizeStatements() : void
  }
  note right of SqliteExportService
    brewery_cache_ removed — row IDs
    are now carried on GeneratedBrewery
    and GeneratedBeer value objects
    and threaded through by the
    orchestrator directly.
  end note

  interface IDateTimeProvider <<interface>> {
    + GetUtcTimestamp() : std::string
  }

  class SystemDateTimeProvider {
    + GetUtcTimestamp() : std::string
  }

}

' ─────────────────────────────────────────────
' ORCHESTRATION
' ─────────────────────────────────────────────
package "Orchestration" {

  class BiergartenPipelineOrchestrator {
    - enrichment_service_ : std::unique_ptr<IEnrichmentService>
    - generator_ : std::unique_ptr<DataGenerator>
    - exporter_ : std::unique_ptr<IExportService>
    - brewery_context_strategy_ : std::unique_ptr<IContextStrategy>
    - beer_context_strategy_ : std::unique_ptr<IContextStrategy>
    - sampling_strategy_ : std::unique_ptr<ISamplingStrategy>
    - checkin_strategy_ : std::unique_ptr<ICheckinDistributionStrategy>
    --
    - user_pool_ : std::vector<GeneratedUser>
    - brewery_pool_ : std::vector<GeneratedBrewery>
    - beer_pool_ : std::vector<GeneratedBeer>
    - checkin_pool_ : std::vector<GeneratedCheckin>
    --
    + Run() : bool
    - RunUserPhase(locations : const std::vector<Location>&) : void
    - RunBreweryPhase(locations : const std::vector<Location>&) : void
    - RunBeerPhase() : void
    - RunCheckinPhase() : void
    - RunRatingPhase() : void
  }
  note right of BiergartenPipelineOrchestrator
    Single component owns all
    sequencing. Run() reads as a
    linear narrative:
      1. RunUserPhase
      2. RunBreweryPhase
      3. RunBeerPhase
      4. checkin_strategy_->AssignActivityWeights
      5. RunCheckinPhase
      6. RunRatingPhase
    The checkin gate is an explicit
    sequential barrier between steps
    3 and 5 — not a hidden internal
    trigger in a separate object.
    Pools are members: each phase
    appends to them and the next
    phase reads from them directly.
    No mediator. No shared_ptr.
    Ownership is unambiguous.
  end note

  class JsonLoader {
    + {static} LoadLocations(filepath : const std::filesystem::path&) : std::vector<Location>
  }

}

' ─────────────────────────────────────────────
' RELATIONSHIPS
' ─────────────────────────────────────────────

' Orchestration
BiergartenPipelineOrchestrator *-- IEnrichmentService : owns
BiergartenPipelineOrchestrator *-- DataGenerator : owns
BiergartenPipelineOrchestrator *-- IExportService : owns
BiergartenPipelineOrchestrator *-- ICheckinDistributionStrategy : owns
BiergartenPipelineOrchestrator *-- ISamplingStrategy : owns
BiergartenPipelineOrchestrator ..> JsonLoader : uses

' Policy implementations
IContextStrategy <|.. BreweryContextStrategy : implements
IContextStrategy <|.. BeerContextStrategy : implements
ISamplingStrategy <|.. UniformSamplingStrategy : implements
ICheckinDistributionStrategy <|.. JCurveCheckinStrategy : implements

' Enrichment
IEnrichmentService <|.. WikipediaService : implements
WikipediaService *-- WebClient : owns
WikipediaService ..> IContextStrategy : uses (parameter)
WebClient <|.. CURLWebClient : implements

' Generation
DataGenerator <|.. MockGenerator : implements
DataGenerator <|.. LlamaGenerator : implements
DataGenerator <|.. RestGenerator : implements
LlamaGenerator *-- IPromptFormatter : owns
LlamaGenerator ..> LlamaConfig : constructed with
RestGenerator ..> RestConfig : constructed with
IPromptFormatter <|.. Gemma4JinjaPromptFormatter : implements

' Export
IExportService <|.. SqliteExportService : implements
SqliteExportService *-- IDateTimeProvider : owns
IDateTimeProvider <|.. SystemDateTimeProvider : implements

' Data flow
EnrichedCity *-- Location : contains
EnrichedCity *-- LocationContext : contains
GeneratedBrewery *-- Location : contains
GeneratedBrewery *-- BreweryResult : contains
GeneratedBeer *-- Location : contains
GeneratedBeer *-- BeerResult : contains
GeneratedUser *-- Location : contains
GeneratedUser *-- UserResult : contains
GeneratedCheckin *-- CheckinResult : contains
GeneratedRating *-- RatingResult : contains

@enduml