-- PROTOTYPE (ticket "Probe vehicle data and native passing in game"): throwaway, lives only on branch prototype/vehicle-probe.
-- Every INTERVAL it dumps every player-owned road vehicle, then groups them by street segment
-- so lanes (edge index) and oncoming traffic (opposite direction / turnaround edge) are visible in stdout.txt.
-- ponytail: module-local timer, not GameScriptState; fine for a probe, resets on reload.

local TAG = "[overtake_probe] "
local INTERVAL = 5.0
local elapsed = 0.0
local ticks = 0

local function p(s : string)
	print(TAG .. s)
end

local function edgeAt(mp : Engine.Component.MovePath) : EdgeId, boolean
	-- path.edges is 1-based, elements are EdgeIdDir userdata (tealdef says {EdgeId, boolean})
	local e = (mp.path.edges as {any})[mp.dyn.pathPos.edgeIndex + 1] as UtilPathfinding.EdgeIdDir
	if e == nil then return nil, nil end
	return e.edgeId, e.dir
end

local function turnaround(edge : EdgeId) : integer
	local tn = api.engine.getComponent(edge.entity, api.type.ComponentType.TRANSPORT_NETWORK) as Engine.Component.TransportNetwork
	if tn == nil or tn.turnaroundEdges == nil then return nil end
	return tn.turnaroundEdges[edge.index + 1]
end

-- EXPERIMENT: does api.cmd.debug.makeComponentExchangeCmd accept a MovePath, and does a positive
-- dyn.timeToIgnore make the follower ignore the vehicle ahead? Hypothesis only; nothing documents either.
local IGNORE_SECONDS = 10.0
local MAX_GAP = 40.0

local record Car
	v : integer
	pos : number
	speed : number
	dir : boolean
	mp : Engine.Component.MovePath
end

local function tryIgnore(follower : Car, leader : Car)
	local mp = follower.mp
	mp.dyn.timeToIgnore = IGNORE_SECONDS
	p(string.format("IGNORE_TEST send veh=%d leader=%d gap=%.1f v=%.2f leaderV=%.2f", follower.v, leader.v, math.abs(leader.pos - follower.pos), follower.speed, leader.speed))
	local cmd = api.cmd.debug.makeComponentExchangeCmd(follower.v, mp as Engine.Component)
	-- engine-state scripts can't pass a callback ("Error decoding argument #3"); the next dump shows the effect
	api.cmd.sendCommand(cmd)
end

local function dump(dt : number)
	local player = api.engine.util.getPlayer()
	local vehicles = api.engine.getEntitiesWithComponent(api.type.ComponentType.TRANSPORT_VEHICLE, { requireOwnedByPlayer = player })
	p(string.format("tick=%d dt=%s playerVehicles=%d", ticks, tostring(dt), #vehicles))

	local bySegment : {integer : {string}} = {}
	local byLane : {string : {Car}} = {}
	for _, v in ipairs(vehicles) do
		local lv = api.engine.getComponent(v, api.type.ComponentType.LAND_VEHICLE) as Engine.Component.LandVehicle
		local mp = api.engine.getComponent(v, api.type.ComponentType.MOVE_PATH) as Engine.Component.MovePath
		if lv ~= nil and not lv.isTram and mp ~= nil then
			local edge, dir = edgeAt(mp)
			local info = api.engine.system.landVehicleMoveSystem.getVehicleInfo(v)
			local seg = edge and edge.entity or -1
			local line = string.format(
				"veh=%d seg=%d lane=%s dir=%s turnaround=%s pos=%.1f speed=%.2f accel=%.2f blocked=%s state=%s standing=%.1f timeToIgnore=%.2f timeUntilAccel=%.2f occ=%s..%s brake=%.1f power=%s traction=%s",
				v, seg, tostring(edge and edge.index), tostring(dir), tostring(edge and turnaround(edge)),
				mp.dyn.pathPos.pos, mp.dyn.speed, mp.dyn.accel, tostring(mp.blocked), tostring(mp.state),
				mp.dyn.timeStanding, mp.dyn.timeToIgnore, mp.dyn.timeUntilAccel,
				tostring(mp.occupiedBackIndex), tostring(mp.occupiedFrontIndex), lv.dyn.brakingTimer,
				tostring(info and info.availPower), tostring(info and info.traction))
			p(line)
			if edge ~= nil then
				local key = seg .. ":" .. edge.index
				byLane[key] = byLane[key] or {}
				table.insert(byLane[key], { v = v, pos = mp.dyn.pathPos.pos, speed = mp.dyn.speed, dir = dir, mp = mp })
			end
			bySegment[seg] = bySegment[seg] or {}
			table.insert(bySegment[seg], string.format("%d(lane=%s,dir=%s,v=%.1f,blk=%s)", v, tostring(edge and edge.index), tostring(dir), mp.dyn.speed, tostring(mp.blocked)))
		end
	end
	for seg, list in pairs(bySegment) do
		if #list > 1 then
			p(string.format("SHARED seg=%d: %s", seg, table.concat(list, " ")))
		end
	end
	for _, cars in pairs(byLane) do
		for i = 1, #cars do
			for j = 1, #cars do
				local a, b = cars[i], cars[j]
				-- ponytail: assumes pos grows in driving direction when dir=true; the log shows whether that holds
				local ahead = (a.dir and b.pos > a.pos) or (not a.dir and b.pos < a.pos)
				if i ~= j and ahead and math.abs(b.pos - a.pos) < MAX_GAP then
					tryIgnore(a, b)
				end
			end
		end
	end
end

local ret : GameScript<table> = {
	update = function(_userParams : table, _state : GameScriptState<table>, dt : number) : nil
		ticks = ticks + 1
		elapsed = elapsed + dt
		if ticks == 1 then p("update running, first dt=" .. tostring(dt)) end
		if elapsed < INTERVAL then return end
		elapsed = 0.0
		xpcall(dump, function(err : any) p("ERROR " .. tostring(err)) end, dt)
	end,
}

return ret