::  metadata-push-hook [landscape]:
::
/-  *group, *invite-store, store=metadata-store, group-store
/+  default-agent, verb, dbug, grpl=group, push-hook,
    resource, mdl=metadata, gral=graph, agentio
~%  %group-hook-top  ..part  ~
|%
+$  card  card:agent:gall
::
++  config
  ^-  config:push-hook
  :*  %metadata-store
      /all
      update:store
      %metadata-update
      %metadata-pull-hook
      2  2
  ==
::
+$  agent  (push-hook:push-hook config)
::
+$  state-null  ~
+$  state-zero  [%0 ~]
::
+$  versioned-state
  $%  state-null
      state-zero
  ==
--
::
::
=+
  ^=  hook-core
  |_  =bowl:gall
  +*  io    ~(. agentio bowl)
      pass   pass:io
  ++  watch-groups  (~(watch-our pass /groups) %group-store /groups)
  --
::
=|  state-zero
=*  state  -
%-  agent:dbug
%+  verb  |
^-  agent:gall
%-  (agent:push-hook config)
^-  agent
|_  =bowl:gall
+*  this        .
    def         ~(. (default-agent this %|) bowl)
    grp       ~(. grpl bowl)
    met       ~(. mdl bowl)
    gra       ~(. gral bowl)
    io        ~(. agentio bowl)
    hc        ~(. hook-core bowl) 
    pass      pass:io
::
++  on-init
  :_  this
  ~[watch-groups:hc]
::
++  on-save  !>(state)
++  on-load
  |=  =vase
  =+  !<(old=versioned-state vase)
  ?:  ?=([%0 ~] old)  `this
  :_  this
  ~[watch-groups:hc]
::
++  on-poke
  |=  [=mark =vase]
  |^  ^-  (quip card _this)
  ?+  mark  (on-poke:def mark vase)
    %metadata-hook-update  metadata-hook-update
    %noun                  noun
  ==
  ::
  ++  metadata-hook-update
    =+  !<(=hook-update:store vase)
    ?.  ?=(%req-preview -.hook-update)
      (on-poke:def mark vase)
    ?>  =(entity.group.hook-update our.bowl)
    =/  =group-preview:store
      (get-preview:met group.hook-update)
    :_  this
    =-  [%pass / %agent [src.bowl %metadata-pull-hook] %poke -]~
    metadata-hook-update+!>(`hook-update:store`[%preview group-preview])
  ::
  ++  noun
    ?+  q.vase  ~|("unknown noun poke" !!)
    ::
        %clean-dm
      =+  .^(sharing=(set resource) (scry:io %gx dap.bowl /sharing/noun))
      :_  this
      %+  murn  ~(tap in sharing)
      |=  rid=resource
      ^-  (unit card)
      ?@  (rush name.rid ;~(pfix (jest 'dm--') fed:ag))  ~
      `(poke-self:pass push-hook-action+!>([%remove rid]))
    ==
  --
::
++  on-agent
  |=  [=wire =sign:agent:gall]
  ?.  ?=([%groups ~] wire)
    (on-agent:def wire sign)
  ?+  -.sign  (on-agent:def wire sign)
    %kick  :_(this ~[watch-groups:hc])
  ::
      %fact
    ?.  =(p.cage.sign %group-update-0)  `this
    =+  !<(=update:group-store q.cage.sign)
    ?.  ?=(%remove-members -.update)  `this
    |^
    =/  graphs=(set resource)
      (hosting-graphs resource.update)
    :_  this
    %+  weld
       (turn ~(tap in graphs) (cury revoke %graph-push-hook))
    ?.  =(entity.resource.update our.bowl)  ~
    (revoke %metadata-push-hook resource.update)^~
    ::
    ++  revoke
      |=  [=dude:gall rid=resource]
      =/  =action:push-hook  [%revoke ships.update rid]
      =/  =cage              push-hook-action+!>(action)
      (poke-our:pass dude cage)
    ::
    ++  hosting-graphs
      |=  rid=resource
      ^-  (set resource)
      =/  graphs=associations:store
        (app-metadata-for-group:met resource.update %graph)
      %-  ~(gas in *(set resource))
      %+  murn  ~(tap in ~(key by graphs))
      |=  [app=term graph=resource]
      ?.  =(our.bowl entity.graph)  ~
      `graph
    --
  ==
++  on-watch  on-watch:def
++  on-leave  on-leave:def
++  on-peek   on-peek:def
++  on-arvo   on-arvo:def
++  on-fail   on-fail:def
::
++  transform-proxy-update
  |=  vas=vase
  ^-  (quip card (unit vase))
  =/  =update:store  !<(update:store vas)
  :-  ~
  ?.  ?=(?(%add %remove %edit) -.update)
    ~
  =/  role=(unit (unit role-tag))
    (role-for-ship:grp group.update src.bowl)
  ?~  role  ~
  =/  metadatum=(unit metadatum:store)
    (peek-metadatum:met %groups group.update)
  ?:  ?&  ?=(~ metadatum)
          (is-managed:grp group.update)
      ==
    ~
  ?:  ?&  ?=(^ metadatum)
          !(is-managed:grp group.update)
      ==
    ~
  ?^  u.role
    ?:  ?=(?(%admin %moderator) u.u.role)
      `vas
    ~
  ?.  ?=(%add -.update)  ~
  ?:  ?&  ?=(^ metadatum)
          =(src.bowl entity.resource.resource.update)
          ?=(%member-metadata vip.u.metadatum)
      ==
    `vas
  ~
::
++  resource-for-update  resource-for-update:met
++  take-update
  |=   =vase
  ^-  [(list card) agent]
  `this
::
++  initial-watch
  |=  [=path rid=resource]
  ^-  vase
  =/  group
    (scry-group:grp rid)
  =/  =associations:store
    (metadata-for-group:met rid)
  ?>  ?=(^ group)
  ?>  (~(has in members.u.group) src.bowl)
  !>  ^-  update:store
  [%initial-group rid associations]
::
--