@startuml
'https://plantuml.com/state-diagram

'scale 600 width
[*] --> CreateProduct
[*] --> UpdateProduct
[*] --> LoadDetailedProducts

state Product {
    state CreateProduct {
        state "Received create Product " as HttpCreateProduct
        state "Call RPC Create Product" as CallRpcCreateProduct
        state "Insert record in database" as InsertRecord
        state "Returns created product via RPC" as RpcReturnDetailedProduct
        state "Emit product_created via MQTT" as ProductCreatedEvent

        HttpCreateProduct --> CallRpcCreateProduct : RPC
        CallRpcCreateProduct --> InsertRecord

        InsertRecord ---> RpcReturnDetailedProduct : RPC
        InsertRecord ---> ProductCreatedEvent : MQTT

        RpcReturnDetailedProduct --> [*]
        ProductCreatedEvent --> [*]
    }

    'state "Update product" as UpdateProduct
    state UpdateProduct {
        state "Received Update product via HTTP" as HttpUpdateProduct
        state "Call RPC Update Product" as CallRpcUpdateProduct
        state "Update Single Product" as UpdateSingleProduct
        state "Returns updated product via RPC" as RpcReturnsUpdatedProduct
        state "Returns failed to update product via RPC" as RpcReturnsFailedUpdateProduct
        state "Emit product_updated via MQTT" as ProductUpdatedEvent

        HttpUpdateProduct --> CallRpcUpdateProduct : RPC

        CallRpcUpdateProduct --> UpdateSingleProduct

        UpdateSingleProduct --> RpcReturnsUpdatedProduct
        UpdateSingleProduct --> RpcReturnsFailedUpdateProduct
        UpdateSingleProduct --> ProductUpdatedEvent

        RpcReturnsUpdatedProduct --> [*] : Succeeded
        RpcReturnsFailedUpdateProduct --> [*] : Failed
        ProductUpdatedEvent --> [*] : Succeeded
    }
}

state LoadDetailedProducts {
    state "Received Load all HTTP Request" as HttpLoadAll
    state "Call RPC Load All" as CallRpcLoadAll
    state "Load add required data from DB" as LoadAllData
    state "Load all products" as LoadProducts
    state "Load all variants for all products" as LoadProductsVariants
    state "Load all products photos" as LoadProductsPhotos
    state "Combine all data" as CombineData
    state "Returns list via RPC" as RpcReturnsList

    HttpLoadAll --> CallRpcLoadAll : RPC
    CallRpcLoadAll --> LoadAllData

    LoadAllData --> LoadProducts : concurrently
    LoadProducts --> CombineData

    LoadAllData --> LoadProductsVariants : concurrently
    LoadProductsVariants --> CombineData

    LoadAllData --> LoadProductsPhotos : concurrently
    LoadProductsPhotos --> CombineData

    LoadAllData --> LoadProductsStock : concurrently
    LoadProductsStock --> CombineData

    CombineData --> RpcReturnsList : RPC

    RpcReturnsList --> [*]
}

@enduml