DERK-v.1.0.1.nlogo

;;;;;;;;;;;;;;;;
;; BREEDS     ;;
;;;;;;;;;;;;;;;;

breed [people person]   ;; Turtles are specified as a breed as later retailers will also be included
;breed [stores store]   ;; TBC

;;;;;;;;;;;;;;;;
;; VARIABLES  ;;
;;;;;;;;;;;;;;;;

globals [
temp0 temp1 temp2       ;; Use to debug code through local of turtle-specific variables
  world.recipes         ;; All recipes avaiable in the virtual world
  world.beef            ;; Daily units of beef consumed
]

people-own [
  memory.recipes        ;; List of recipes known by an agent
  house.food.storage    ;; List of ingredients (foods) available to an agent
  planned.meal          ;; Recipe selected by an agent to be consumed
  shopping.list         ;; Ingredients that needs to be bought to consume planned.meal
]

;;;;;;;;;;;;;;;;
;; SETUP      ;;
;;;;;;;;;;;;;;;;

to setup
  ca

  ;; Insert here the list of recipes that will be available to be known by people.
  ;; This list also defines the ingredients that will be considered in agents' house food storage.
  set world.recipes (list ["beef" "potatoes" "beans"] ["fish" "chips"] ["fish" "beans"] ["beef" "chips"] ["fish" "salad"] ["tomatoes" "salad"])

  ;; Create people and initialise people's variables
  create-people Number.of.People [
    ;; Number of recipes known by an agent
    set memory.recipes n-of (1 + (floor random-normal 3 0.25)) world.recipes ;; Normal distribution of meal prepartion knowledge (i.e. recipes)
    set house.food.storage []
    build-house.food.storage   ;; Initialise available ingredients
    set shopping.list []
  ]


  reset-ticks
end

;; For each recipe imported in the virtual world, this piece of code create for each agent a "virtual kitchen" with all the ingredients and their current availability
to build-house.food.storage
  ; First extract the single ingredients from the imported recipes and create a food storage list for each agents
  foreach world.recipes
  [
    let x ?
    foreach x
    [
      if member? ? house.food.storage = FALSE
      [
        set house.food.storage lput (?) house.food.storage ; This contains a list of food names (e.g. [beef salad ...])
      ]
    ]
  ]

  ;; Rewrite house food storage as a list of lists to store availability of each food
  let i 0
  while [i <= ((length house.food.storage) - 1)]
  [
    ;; Rewrite the current ingredient as a list and add next to the name the initial value available (e.g. [beef salad ...] >> [[beef 4] [salad 0] ...]
    let newitem (list (item i house.food.storage) (0))
    set house.food.storage (replace-item i house.food.storage newitem)
    set i i + 1
  ]
end


;;;;;;;;;;;;;;;;
;; GO         ;;
;;;;;;;;;;;;;;;;

to go

  new-tick-reset

  ask people
  [
    set planned.meal item 0 (n-of 1 memory.recipes) ; The use of "item 0" make "planned.meal" a list, rather than returning a list of list (because memory.recipes is a list of lists)
    ifelse check-ingredients-availability (planned.meal)
    [
      consume-meal (planned.meal)
    ]
    [
      food-shopping  ;; Shop for the food required by the recipe
      set shopping.list []  ;; Reset shopping list immediately after the ingredients have been bought and made available for the recipe
      consume-meal (planned.meal)
    ]
  ]

 tick

end

to-report check-ingredients-availability [mymeal] ;; Note that you're in a turtle context
;; Check the availability of only one ingredient of mymeal
  let all.ingredients.available? TRUE ;; Start assuming there are all the necessary ingredients
  let i 0
  while [i <= ((length mymeal) - 1)]  ;; (NB there's probably a more elegant way than using while for a list that check another list, but that'll do for now)
  [
    ;; For each ingredient of planned meal, report the current availability by looking at the house food storage (which is a list of lists, like [[Food.X Value.for.X] [Food.Y Value.for.Y] ...]
    let drawer filter [(item i mymeal) = (item 0 ?)] house.food.storage ; "Filter" returns "drawer" something like [[Food.X Value.for.X]] (note the double brackets)
    set drawer (item 0 drawer) ;; We need to ask "item 0" to remove the first set of brackets from the previous variable, so that we end with [Food.X Value.for.X]
    ;; Build the shopping list for the future
    if ((item 1 drawer) = 0)
    [
      build-shopping-list (item 0 drawer)
      set all.ingredients.available? FALSE ;; If at least one ingredients is missing the function will report that something is missing
    ]
    set i i + 1
  ]
  report all.ingredients.available?
end

to build-shopping-list [food.to.restock]
  ;; If the availability ("item 1") of a food ("item 0") is equal to zero, list that food in the shopping list
  ; Check if the item is already in the shopping list, first
  if member? (food.to.restock) shopping.list = FALSE
  [
    ; Add the item to the shopping list
    set shopping.list fput (food.to.restock) shopping.list
set temp0 shopping.list ;;DEBUG
  ]
end

to consume-meal [mymeal]
  let i 0
  while [i <= ((length mymeal) - 1)]
  [
    let item.position 0
    foreach house.food.storage
    [
      if (item i mymeal) = (item 0 ?) ;; Here "?" refers to "house.food.storage" list, the code compare the name of the food between the lists
      [
        ;; If ingredient in the planned meal matches the item in the house food storage, than save the position of that item
        set item.position (position ? house.food.storage)
        let current.stock.of.food.i (item 1 ?)
        ;;  list to update                position in the wider list [[X],[]]  what item replace    repeat previous position          define the new value
        set house.food.storage (replace-item item.position house.food.storage (replace-item 1 (item item.position house.food.storage) (current.stock.of.food.i - 1) )) ;; See last part of "Changing list items" from the Programming guide for help
        world-monitor (item i mymeal)
      ]
    ]
    set i i + 1
  ]
end

to food-shopping
  let i 0
  while [i <= ((length shopping.list) - 1)]
  [
    let item.position 0
    foreach house.food.storage
    [
      if (item i shopping.list) = (item 0 ?) ;; Here "?" refers to "house.food.storage" list
      [
        ;; If ingredient in the planned meal matches the item in the house food storage, than save the position of that item
        set item.position (position ? house.food.storage)
        let current.stock.of.food.i (item 1 ?)
        let food.restock.value 10
        ;;  list to update                position in the wider list [[X],[]]  what item replace    repeat previous position          define the new value
        set house.food.storage (replace-item item.position house.food.storage (replace-item 1 (item item.position house.food.storage) (current.stock.of.food.i + food.restock.value  ) )) ;; See last part of "Changing list items" from the Programming guide for help
      ]
    ]
    set i i + 1
  ]
end


;;;;;;;;;;;;;;;;;;;;
;; UPDATEs/PLOTS  ;;
;;;;;;;;;;;;;;;;;;;;


to new-tick-reset
  set world.beef 0
end

to world-monitor [food.consumed]
  if (food.consumed) = "beef" [ set world.beef (world.beef + 1)]
end
@#$#@#$#@
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DERK - Diet emergence from recipes knowledge
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PLOT
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Overall daily units of beef consumed
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"" ""
PENS
"default" 1.0 0 -16777216 true "" "plot world.beef"

MONITOR
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SLIDER
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HORIZONTAL

@#$#@#$#@
## WHAT IS IT?

DERK creates one or more individuals each one endowed with a set of recipes (meaning, what foods can be paired). At each time step, an agent decides to consume a meal corresponding to a random recipe. Accordingly, it checks if all the ingredients required for the recipe are available: when they are available it consumes immediately the meal, otherwise it must first shop for the food it needs and then consume the meal. Food availability is checked after each consumed meals and food shopping.

## HOW IT WORKS

(what rules the agents use to create the overall behavior of the model)

## HOW TO USE IT

(how to use the model, including a description of each of the items in the Interface tab)

## THINGS TO NOTICE

(suggested things for the user to notice while running the model)

## THINGS TO TRY

(suggested things for the user to try to do (move sliders, switches, etc.) with the model)

## EXTENDING THE MODEL

(suggested things to add or change in the Code tab to make the model more complicated, detailed, accurate, etc.)

## NETLOGO FEATURES

(interesting or unusual features of NetLogo that the model uses, particularly in the Code tab; or where workarounds were needed for missing features)

## RELATED MODELS

(models in the NetLogo Models Library and elsewhere which are of related interest)

## CREDITS AND REFERENCES

(a reference to the model's URL on the web if it has one, as well as any other necessary credits, citations, and links)
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NetLogo 5.3.1
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