#reformatted the flag to use a flag map instead, can read more about that here: https://guide.denizenscript.com/guides/basics/flags.html#advanced-note-maps-and-sub-maps
#night market inventory
night_market:
  type: inventory
  inventory: chest
  size: 27
  #set gui to true so you don't have to listen to click events and cancel them manually
  gui: true
  #filler item
  definitions:
    filler: black_stained_glass_pane[display=<&r>]
  #procedural items for the unrevealed/revealed items
  ##can read more about them here https://meta.denizenscript.com/Docs/Languages/inventory%20script%20containers
  procedural items:
  #define the contents
  #https://meta.denizenscript.com/Docs/Tags/repeat_as#objecttag.repeat_as_list
  - define contents <player.flag[night_market.contents].if_null[<item[unrevealed_item].repeat_as_list[4]>]>
  #define the reroll item depending if they've rerolled or not
  - if <player.has_flag[night_market.rerolled]>:
    - define reroll "barrier[display=<&c>You've already rerolled...]"
  - else:
    - define reroll reroll_item
  #determine the defined contents + the reroll
  - determine <[contents].include[<[reroll]>]>
  slots:
  - [filler] [filler] [filler] [filler] [filler] [filler] [filler] [filler] [filler]
  - [filler] [] [filler] [] [filler] [] [filler] [] [filler]
  - [] [filler] [filler] [filler] [filler] [filler] [filler] [filler] [filler]

#item that appears if they haven't "revealed" the item in that slot yet (can modify to your likings)
unrevealed_item:
  type: item
  material: gold_nugget
  display name: <&a>Click to reveal...

#rerolling item
reroll_item:
  type: item
  material: ender_eye
  display name: <&a>Click to re-roll...

night_market_handler:
  type: world
  events:

    after player clicks unrevealed_item in night_market:
    #a random item from a list as loot
    - define loot <list[iron_ingot|gold_ingot|diamond|netherite_ingot].random>
    - inventory set slot:<context.slot> d:<context.inventory> o:<[loot]>
    #these are the items (revealed and unrevealed) that you determine as procedural items above
    #the slot numbers are the slots in which there are items to reveal/revealed already
    #there are multiple ways of doing this (matchers and what not), I think this works for an example
    - define contents <context.inventory.slot[11|13|15|17]>
    - flag <player> night_market.contents:<[contents]>

    after player clicks reroll_item in night_market:
    #define the already rolled items
    - define rolls <player.flag[night_market.contents].if_null[<list>]>
    #check if they've rolled all items before they reroll
    #https://meta.denizenscript.com/Docs/Tags/contains_mat#listtag.contains_match
    #https://meta.denizenscript.com/Docs/Search/fallbacks#tag%20fallbacks
    ##this is optional, I just thought it'd make sense to have a check for it
    - if <[rolls].contains_match[unrevealed_item]> || !<[rolls].is_truthy>:
      - narrate "<&c>Roll every item first!"
      - stop

    #remove the previously saved contents
    - flag <player> night_market.contents:!
    #flag the player to track if they've rerolled or not
    - flag <player> night_market.rerolled
    #reopen the inventory
    - inventory open d:night_market

    #this is where you reset every players night market
    #in this example, this will only run at 12pm every Sunday
    after system time 12:00:
    #check if day is Sunday
    - if <util.time_now.day_of_week_name> != sunday:
      - stop
    - announce "<&a>Night Market <&7>has been reset!"
    #remove the night_market flag from every player that has it
    #https://meta.denizenscript.com/Docs/Tags/server.players_flagged#server.players_flagged
    - flag <server.players_flagged[night_market]> night_market:!