globals [
  ;; model parameters
  number-of-house
  number-of-cars
  max-wtp                       ;; maximal wtp of healthy cars for a time unit of parking
  decrease-in-wtp-per-unit      ;; how much the current wtp deacrease per tick when the car is parked
  number-of-parking-places      ;; how many parking places are there
  mov-avg-length                ;; length of moving averages
  ;; aggregate statistics
  ;; -- current data in the last tick
  current-profit                ;; current owner's profit in the tick
  current-surplus               ;; current consumers' surplus in the tick
  current-usage-percents        ;; current per cents of parking lot used in the tick
  ;; -- list of data for ticks within a day
  parking-firm-profits          ;; profits of the owner within a day
  surpluses-of-parking-cars     ;; surpluses of the parking car within a day
  usage-percents-list           ;; how much is the parking lot used within a day in per cents
                   ;; storing data about the price evolution within a day
  ;; -- daily data
  last-price                    ;; average price within the last day
  ;; -- list of daily data
  daily-profit-list             ;; daily profits of the parking lots' owner
  daily-surplus-list            ;; daily consumers' surpluses
  daily-total-surplus-list      ;; daily total surpluses (total welfares)
  daily-usage-list              ;; daily average of how much is the parking lot used by all cars

]

;;object and its variables
breed [ cars car ]
cars-own [
  parked          ;; true if the car is parked, false otherwise
  wtp             ;; the car's general WTP, constant over time
  actual-wtp      ;; the car's current WTP, decreasing when parked
  not-moved       ;; true if the car has not move in the period
]
breed [houses house]

;; SETUP


to startup
  setup
end

;; setup
to setup
  clear-all
  if not random-start? [ random-seed initial-random-seed ]
  setup-globals
  setup-cars
  setup-road
  reset-ticks
end

;; setup the global variables
to setup-globals
  ;; setup the model parameters
  set number-of-house 1
  set number-of-cars 10
  set max-wtp 100
  set decrease-in-wtp-per-unit 10
  set number-of-parking-places 8
  set mov-avg-length 30
  ;; setup the aggregate statistics
  set surpluses-of-parking-cars ( list )
  set parking-firm-profits ( list )
  set current-profit 0
  set current-surplus 0
  set usage-percents-list ( list )
  set daily-profit-list ( list )
  set daily-surplus-list ( list )
  set daily-total-surplus-list ( list )
  set daily-usage-list ( list )
  set price 10
end

;; setup the cars
to setup-cars
  create-cars number-of-cars [
    set wtp random ( max-wtp + 1 )
    set actual-wtp wtp
    set parked false
    set heading 90
    set shape "car"
    set size 0.75
    set color blue
    set not-moved false
    setxy 0 0
    if ( any? patches with [ ( pycor = 0 ) and ( count cars-here = 0 ) ] ) [
      move-to one-of patches with [ ( pycor = 0 ) and ( count cars-here = 0 ) ]
    ]
  ]

end

;; setup the road and the parking lots
to setup-road
  create-turtles 1[
  set shape "house"
  set color red
  set size 1
  setxy 15 3
  ]
  let pp ( round ( ( max-pxcor - number-of-parking-places ) / 2 ) )
  ask patches with [(pycor = 1) and (pxcor >= pp) and (pxcor < ( pp + number-of-parking-places ))] [
    set pcolor white
  ]
end


;; major simulations loop
to go
  ;; decrease the actual wtp of parked cars
  ask cars with [ parked ] [ set actual-wtp ( actual-wtp - decrease-in-wtp-per-unit ) ]
  ;; major move: unpark, move, park
  move
  ;; restore wtp of the cars that left the parking lot and cannot park now
  ask cars with [ ( not parked ) and ( ( [ pcolor ] of patch-at 0 -1 ) = black ) ]
  [ set actual-wtp ( wtp + ifelse-value ( TRUE ) [ actual-wtp ] [ 0 ] ) ]
  store-data
  tick
end

to move
  ask cars with [ not parked ] [ set not-moved true ]
  loop [
    ;; stop if no not-moved cars
    if ( not any? cars with [ ( not parked ) and not-moved and ( not any? cars-on patch-ahead 1 ) ] ) [ stop ]
    ;; leave the parking lot
    ask cars with [ parked and ( actual-wtp < price ) and ( not any? cars-on patch-at 0 -1 ) ]
    [
      set heading 180
      fd 1
      set heading 90
      set not-moved true
      set parked false

    ]
    ;; move forward on the road
    let s ( cars with [ ( not parked ) and not-moved and ( not any? cars-on patch-ahead 1 ) ] )
    if any? s
    [
      ask one-of s
      [
        fd 1
        set not-moved false
      ]
    ]
    ;; enter the parking lot
    ask cars with [ ( [ pcolor ] of patch-at 0 1 = white ) and ( not any? cars-on patch-at 0 1 ) and
    ( actual-wtp >= price) ]
    [
      set heading 0
      fd 1
      set heading 180
      set not-moved false
      set parked true
    ]
  ]
end

;; store the aggregate data into global variables
to store-data
  ;; current data in the tick
  let current-usage ( count cars with [ parked ] )
  set current-profit ( current-usage * price )
  let current-wtp ( sum [ actual-wtp ] of cars with [ parked ] )
  set current-surplus ( current-wtp - current-profit )
  set current-usage-percents ( current-usage / number-of-parking-places * 10 )
  ;; list with current data in ticks within a day
  set surpluses-of-parking-cars ( lput current-surplus surpluses-of-parking-cars )
  if ( ( length surpluses-of-parking-cars ) > world-width ) [
    set surpluses-of-parking-cars ( but-first surpluses-of-parking-cars )
  ]
  set parking-firm-profits ( lput current-profit parking-firm-profits )
  if ( ( length parking-firm-profits ) > world-width ) [
    set parking-firm-profits ( but-first parking-firm-profits )
  ]
  set usage-percents-list ( lput current-usage-percents usage-percents-list )
  if ( ( length usage-percents-list ) > world-width ) [
    set usage-percents-list ( but-first usage-percents-list )
  ]

  ;; at the end of the day
  if ( ( ticks > 0 ) and ( ( ticks + 1 ) mod world-width = 0 ) )
  [
    set daily-profit-list ( lput daily-profit daily-profit-list )
    if ( ( length daily-profit-list ) > mov-avg-length ) [
      set daily-profit-list ( but-first daily-profit-list )
    ]
    set daily-surplus-list ( lput daily-surplus daily-surplus-list )
    if ( ( length daily-surplus-list ) > mov-avg-length ) [
      set daily-surplus-list ( but-first daily-surplus-list )
    ]
    set daily-total-surplus-list ( lput daily-total-surplus daily-total-surplus-list )
    if ( ( length daily-total-surplus-list ) > mov-avg-length ) [
      set daily-total-surplus-list ( but-first daily-total-surplus-list )
    ]

    set daily-usage-list ( lput daily-mean-usage-percents daily-usage-list )
    if ( ( length daily-usage-list ) > mov-avg-length ) [
      set daily-usage-list ( but-first daily-usage-list )
    ]

  ]
end

;; reports lots owner's daily profit
to-report daily-profit
  report sum parking-firm-profits
end

;; reports consumers' daily surplus
to-report daily-surplus
  report sum surpluses-of-parking-cars
end

;; reports daily total surplus
to-report daily-total-surplus
  report ( daily-profit + daily-surplus )
end

;; reports how much is the parking lot used within a day in per cents
to-report daily-mean-usage-percents
  report mean usage-percents-list
end

;; Moving average values
;;;;;;;;;;;;;;;;;;;;;;;;;;

;; reports the moving average of the daily profits of the parking lots' owner
to-report average-daily-profit
  report mean daily-profit-list
end

;; reports the moving average of the daily consumers' surpluses
to-report average-daily-surplus
  report mean daily-surplus-list
end

;; reports the moving average of the daily total surpluses
to-report average-daily-total-surplus
  report mean daily-total-surplus-list
end


;; reports the moving average of how much is the parking lot used by all cars
to-report average-usage
  report mean daily-usage-list
end
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