-- Personal fork: synergy notes for owned items (Russian).
-- Data comes prebuilt from dead_god_items.json, see
-- EID-localization-audit/build_synergy_table.py and features/eid_synergy_data.lua.
-- When the player owns item A and looks at item B that synergizes with A,
-- the relevant note is appended to B's description.

local MAX_SYNERGY_LINES = 3

local function synergyTableFor(desc)
	if EID.SynergyDataRU == nil then return nil end
	if desc.ObjType ~= EntityType.ENTITY_PICKUP then return nil end
	if desc.ObjVariant == PickupVariant.PICKUP_COLLECTIBLE then
		return EID.SynergyDataRU.coll[desc.ObjSubType]
	elseif desc.ObjVariant == PickupVariant.PICKUP_TRINKET then
		return EID.SynergyDataRU.trink[desc.ObjSubType]
	end
	return nil
end

local function anyPartnerOwned(entry)
	for _, partner in ipairs(entry.partners) do
		if EID:PlayersHaveCollectible(partner) then
			return true
		end
	end
	return false
end

local function synergyCondition(desc)
	if EID:getLanguage() ~= "ru" then return false end
	if EID.Config["DisplaySynergies"] == false then return false end
	local list = synergyTableFor(desc)
	if not list then return false end
	for _, entry in ipairs(list) do
		if anyPartnerOwned(entry) then
			return true
		end
	end
	return false
end

-- Removes leading "«Name»" chunks naming this very partner, so the line
-- does not read "Ladder: «Ladder» / ...". Leads naming other partners stay.
local function stripOwnNameLead(text, name)
	local lead = "«" .. name .. "»"
	while text:sub(1, #lead) == lead do
		text = text:sub(#lead + 1):match("^%s*[/:—,–-]?%s*(.-)%s*$")
	end
	return text
end

local function synergyCallback(desc)
	local list = synergyTableFor(desc)
	if not list then return desc end
	-- collect (partner, text) pairs for owned partners only
	local lines = {}
	for _, entry in ipairs(list) do
		for _, partner in ipairs(entry.partners) do
			if EID:PlayersHaveCollectible(partner) then
				lines[#lines + 1] = { partner = partner, text = entry.text }
				break
			end
		end
	end
	if #lines == 0 then return desc end
	-- NOTE: a line starting with "{{Blank}} " gets an invisible bullet (= no dot),
	-- and a line containing only "{{Blank}} " renders as an empty paragraph
	-- (printBulletPoints advances one lineHeight per #-segment unconditionally)
	desc.Description = desc.Description .. "#{{Blank}} #{{Blank}} Синергии:"
	for i = 1, math.min(#lines, MAX_SYNERGY_LINES) do
		-- NOTE: {{CollectibleID}} renders only the icon; the name is NOT
		-- auto-appended by the engine, so prepend the official item name here
		local partnerName = EID:getObjectName(EntityType.ENTITY_PICKUP, PickupVariant.PICKUP_COLLECTIBLE, lines[i].partner)
		local body = stripOwnNameLead(lines[i].text, partnerName)
		desc.Description = desc.Description .. "#{{Collectible" .. lines[i].partner .. "}} " .. partnerName .. ": " .. body
	end
	if #lines > MAX_SYNERGY_LINES then
		desc.Description = desc.Description .. "#…и ещё синергий: " .. (#lines - MAX_SYNERGY_LINES)
	end
	return desc
end

EID:addDescriptionModifier("EID Personal Synergy Notes", synergyCondition, synergyCallback)