savegame_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
    prev_scene(("Previous scene"))

    print_save_data_list["print save data list"]
    user_input_number["wait: user input number"]
    user_input_number_is{"user input number?"}
    builtin_savecomment["set current time, format 2006/01/02 15:04:05, to save comment"]
    savegame_event_before_save("script: savegame_event_before_save()")
    savegame_event_before_save_exist{"savegame_event_before_save()?"}
    builtin_savedata["save data to file"]
    
    %% apply styles
    class savegame_event_before_save class_script_call
    
    %% flows
    scene_start_common --> |continue current scene| print_save_data_list
    print_save_data_list --> user_input_number

    user_input_number --> user_input_number_is
    user_input_number_is --> |100| prev_scene
    user_input_number_is --> |"0 .. 19"| builtin_savecomment
    user_input_number_is --> |others| print_save_data_list

    builtin_savecomment --> savegame_event_before_save_exist
    savegame_event_before_save_exist --> |exist| savegame_event_before_save
    savegame_event_before_save --> builtin_savedata
    savegame_event_before_save_exist --> |NOT exist| builtin_savedata

    builtin_savedata --> print_save_data_list

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