Cart process

flowchart TD
    Start[Start] --> CheckInput{Is quantity zero or product ID missing?}

    CheckInput -- Yes --> InputError[Add error and exit]
    CheckInput -- No --> LoadProduct[Load product]

    LoadProduct --> ProductValid{Is product valid and accessible?}
    ProductValid -- No --> ProductError[Add error and exit]
    ProductValid -- Yes --> CheckCartQty[Check cart quantity]

    CheckCartQty --> CalculateQty[Adjust quantity based on operation]
    CalculateQty --> StockCheck{Is there enough stock?}

    StockCheck -- No --> StockError[Add stock error and exit]
    StockCheck -- Yes --> ModeCheck{Is mode add?}

    ModeCheck -- No --> End[End]
    ModeCheck -- Yes --> CartExists{Does cart exist?}

    CartExists -- No --> CreateCart[Create a new cart]
    CartExists --> CheckCustom[Are required custom fields filled?]
    CheckCustom -- No --> CustomError[Add customization error and exit]

    CheckCustom -- Yes --> UpdateQty[Call updateQty function]
    UpdateQty --> QtyResult{Result of updateQty}

    QtyResult -- Less than 0 --> MinQtyError[Show minimal quantity error]
    QtyResult -- Equal to 0 --> MaxQtyError[Show max quantity error]
    QtyResult -- Greater than 0 --> AllowRefreshCheck{Is allow refresh enabled?}

    AllowRefreshCheck -- No --> SkipRefresh[Skip cart rule refresh]
    AllowRefreshCheck -- Yes --> CompareRules[Compare cart rules]

    CompareRules --> RulesChanged{Did cart rules change?}
    RulesChanged -- Yes --> SetRefresh[Set ajax refresh to true]
    RulesChanged -- No --> SkipRefresh

    SkipRefresh --> AutoRemove[Auto remove cart rules]
    AutoRemove --> AutoAdd[Auto add cart rules]
    AutoAdd --> RulesRemoved{Were rules removed and refresh allowed?}

    RulesRemoved -- Yes --> FinalRefresh[Set ajax refresh to true]
    RulesRemoved -- No --> End

    InputError --> End
    ProductError --> End
    StockError --> End
    CustomError --> End
    MinQtyError --> End
    MaxQtyError --> End

flowchart TD
    A["Start: Delete Cart Product Request"] --> B["Check for Other Customizations of Same Product"]
    B --> C{"Other Customizations Exist?"}
    C -- No --> G["Proceed to Delete Product"]
    C -- Yes --> D["Get Minimal Quantity of Product or Attribute"]
    D --> E["Sum Quantities of Other Customizations"]
    E --> F{"Total Quantity >= Minimal Required?"}
    F -- No --> Z["Return AJAX Error: Not Enough Quantity"]
    F -- Yes --> G
    G --> H{"Product Successfully Deleted?"}
    H -- No --> END["Exit"]
    H -- Yes --> I["Trigger actionAfterDeleteProductInCart Hook"]
    I --> J{"Is Cart Now Empty?"}
    J -- Yes --> K["Reset Delivery Option and Gift Info"]
    J -- No --> L["Skip Reset"]
    K --> M["Update Cart"]
    L --> M
    M --> N["Remove Invalid Cart Rules"]
    N --> O["Add Applicable Cart Rules"]
    O --> P{"Cart Rules Removed and allow_refresh = true?"}
    P -- Yes --> Q["Set ajax_refresh = true"]
    P -- No --> END
    Q --> END
    Z --> END