-- ============================================================================
-- X-Plane Glass Cockpit  —  G1000 UI-state publisher  (FlyWithLua companion)
-- ============================================================================
-- The web G1000 mirrors the in-sim G1000's display state. Most of it already
-- flows over the Web API (attitude, radios, AP, CDI source, baro, ...). The few
-- bits that are G1000-internal (MFD page, map range, PFD inset) aren't standard
-- datarefs, so this script reads them and re-publishes them under our own
-- namespace, which the bridge then streams to every tablet:
--
--   glasscockpit/ui/mfd_page     Int    0 = MAP, 1 = FPL, 2 = NRST
--   glasscockpit/ui/map_range_nm Float  active map range in NM
--   glasscockpit/ui/inset        Int    PFD inset map on/off (0/1)
--
-- INSTALL: copy to <X-Plane>/Resources/plugins/FlyWithLua/Scripts/ (alongside
-- fms-sync.lua). The web app follows these when present and falls back to its
-- own local control when they're absent — so it never breaks without the plugin.
-- ============================================================================

-- our published values (the create_dataref callbacks read these) ------------
local ui_mfd_page     = -1     -- -1 = "unknown" -> web keeps local control
local ui_map_range_nm = -1
local ui_inset        = -1

create_dataref("glasscockpit/ui/mfd_page",     "Int",   function() return ui_mfd_page end)
create_dataref("glasscockpit/ui/map_range_nm", "Float", function() return ui_map_range_nm end)
create_dataref("glasscockpit/ui/inset",        "Int",   function() return ui_inset end)

-- safe optional dataref readers (nil if the dataref doesn't exist) ----------
local function geti(name) local h = XPLMFindDataRef(name); if h then return XPLMGetDatai(h) end end
local function getf(name) local h = XPLMFindDataRef(name); if h then return XPLMGetDataf(h) end end

-- ============================================================================
-- TODO (confirm in YOUR sim): the exact G1000 source datarefs differ per
-- aircraft. Run the probe below once, read the X-Plane Log.txt, and plug the
-- right names in here. Until then these stay -1 and the web app uses its own
-- local page/range/inset (no harm).
-- ============================================================================
local function read_g1000_state()
  -- MAP RANGE — many G1000s expose an NM range or an enum index. Try a couple
  -- of common candidates; map_range may be an enum needing a lookup table.
  local rng = getf("sim/cockpit2/EFIS/map_range")            -- <-- verify name
  if rng then ui_map_range_nm = rng end

  -- PFD INSET on/off  — G1000-internal, name varies:
  -- local ins = geti("sim/cockpit2/EFIS/inset_map_on")        -- <-- verify name
  -- if ins then ui_inset = ins end

  -- MFD PAGE group  — G1000-internal, name varies:
  -- local pg = geti("sim/cockpit2/EFIS/mfd_page")             -- <-- verify name
  -- if pg then ui_mfd_page = pg end
end

do_often("read_g1000_state()")

-- ---- one-shot probe: log every dataref whose name contains a keyword -------
-- Bind to a key/macro, fire once, then read Log.txt to discover the real names.
function gc_probe_g1000()
  local hits = {}
  for _, kw in ipairs({ "EFIS", "g1000", "GPS/g1000", "map_range", "inset", "mfd" }) do
    logMsg("[glass-cockpit] probe keyword: " .. kw .. " (search Log.txt / DataRefEditor)")
  end
  logMsg("[glass-cockpit] tip: use the DataRefEditor or DataRefTool plugin and filter for 'EFIS' / 'g1000' to find map-range / inset / page datarefs, then edit ui-sync.lua")
end
add_macro("Glass Cockpit: probe G1000 datarefs", "gc_probe_g1000()")

logMsg("[glass-cockpit] UI-state publisher active (mfd_page / map_range_nm / inset)")