-- states/research.lua — the research tree.
--
-- Not a list: a 2D graph of nodes navigated with the arrow keys, where up/down
-- jump to the nearest node on the adjacent row. Nodes are drawn as icons with no
-- text label, so there is no on-screen name to relay -- the id is the only
-- identifier available, and the useful facts are whether the node is already
-- unlocked, whether it CAN be unlocked yet, and whether you can afford it.
--
-- Without that last part the screen is unusable by ear: pressing enter on an
-- unaffordable node simply does nothing.

local researchModel = require("models.research")

-- "alchemy_basics_2" -> "alchemy basics 2"
local function humanise(id)
	return (tostring(id):gsub("_", " "))
end

return {
	read = function(stateTable, menus)
		local nodeId = menus.getAnyUpvalue(stateTable, "currentNodeId")

		if nodeId == nil then
			return nil, nil
		end

		local parts = {humanise(nodeId)}

		local unlocked = researchModel.unlockedNodes and researchModel.unlockedNodes[nodeId]

		if unlocked then
			parts[#parts + 1] = "researched"
		else
			local okUnlockable, unlockable = pcall(researchModel.isUnlockable, nodeId)
			local okAfford, affordable = pcall(researchModel.canAffordNode, nodeId)

			if okUnlockable and not unlockable then
				parts[#parts + 1] = "locked"
			elseif okAfford and not affordable then
				parts[#parts + 1] = "cannot afford"
			else
				parts[#parts + 1] = "available"
			end
		end

		return table.concat(parts, ", "), tostring(nodeId) .. ":" .. tostring(unlocked)
	end,
}