shop_flow

graph TB
    %% -- Common Template --

    %% nodes
    start(("Start"))
    next_scene_from_common(("Next scene"))
    scene_start_common["goto: scene_start_common()"]

    %% styles
    classDef class_script_call fill:#CAF
    classDef class_routine_call fill:#EE9
 
    %% apply styles
        class scene_start_common class_routine_call

    %% flow
    start --> scene_start_common
    scene_start_common --> |next scene| next_scene_from_common

    %% -- scene specific --

    %% nodes
    next_scene(("Next scene"))
    prev_scene(("Previous scene"))
    
    next_scene_exist{"next scene?"}
    shop_replace_show_menu("script: shop_replace_show_menu()")
    shop_replace_show_menu_exist{"shop_replace_show_menu()?"}
    shop_replace_show_menu_used{"shop_replace_show_menu()?"}
    builtin_print_item_menu["print item menu"]
    user_input_number("wait: user input number")
    shop_user_menu_selected("script: handled = shop_user_menu_selected(input_number)")
    menu_handled{"return value?"}
    user_input_number_is{"user input number"}

    %% apply styles
    class shop_replace_show_menu,shop_user_menu_selected class_script_call

    %% flows
    scene_start_common --> |continue current scene| next_scene_exist

    next_scene_exist --> |exist| next_scene
    next_scene_exist --> |NOT exist| shop_replace_show_menu_exist

    shop_replace_show_menu_exist --> |exist| shop_replace_show_menu 
    shop_replace_show_menu_exist --> |NOT exist| builtin_print_item_menu 

    shop_replace_show_menu --> user_input_number
    builtin_print_item_menu -->
    user_input_number

    user_input_number --> shop_user_menu_selected
    shop_user_menu_selected --> menu_handled

    menu_handled --> |true| next_scene_exist
    menu_handled --> |false| shop_replace_show_menu_used

    shop_replace_show_menu_used --> |used| user_input_number
    shop_replace_show_menu_used --> |NOT used| user_input_number_is

    user_input_number_is --> |"[-1] Back"|　prev_scene
    user_input_number_is --> |others| user_input_number

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