extends RefCounted
const DURATION := 600.0
const IDS := [
	"gamma_cannon", "beam_laser", "machine_gun", "missile_launcher", "unguided_missile",
	"incendiary_missile", "radiation_laser", "artillery_cannon", "external_turret", "pulse_laser",
	"recycler", "virus", "titanium_armor", "combat_drones", "teleport", "cloak",
	"mine_layer", "flares", "solar_shield_charge", "auxiliary_shield",
	"afterburner", "shield_charge", "repair_drones",
]
const COSTS := {
	"auxiliary_shield":{"uranium":45,"aluminium":40,"titanium":30,"silicon":15},
	"pulse_laser":{"uranium":40,"aluminium":35,"titanium":25,"copper":15},
	"external_turret":{"iron":50,"titanium":35,"aluminium":25,"sulfur":20},
	"gamma_cannon":{"uranium":45,"titanium":30,"aluminium":20},
	"beam_laser":{"uranium":30,"aluminium":30,"iron":15},
	"machine_gun":{"iron":30,"titanium":20,"sulfur":15},
	"missile_launcher":{"iron":40,"sulfur":30,"uranium":15},
	"unguided_missile":{"iron":30,"sulfur":25,"aluminium":15},
	"recycler":{"iron":25,"aluminium":25,"titanium":15},
	"virus":{"uranium":25,"aluminium":30,"titanium":15},
	"titanium_armor":{"titanium":45,"iron":30},
	"combat_drones":{"iron":35,"titanium":25,"uranium":20},
	"teleport":{"uranium":45,"aluminium":30,"titanium":20},
	"cloak":{"uranium":35,"aluminium":30,"titanium":20},
	"mine_layer":{"iron":30,"sulfur":25,"uranium":15},
	"flares":{"sulfur":25,"aluminium":20,"iron":15},
	"solar_shield_charge":{"uranium":25,"aluminium":35,"titanium":15},
	"afterburner":{"iron":25,"sulfur":30,"aluminium":20},
	"shield_charge":{"uranium":30,"aluminium":25,"titanium":20},
	"repair_drones":{"iron":30,"titanium":25,"aluminium":20},
	"incendiary_missile":{"iron":45,"sulfur":60,"uranium":30,"copper":12,"mercury":6},
	"radiation_laser":{"uranium":60,"aluminium":45,"silicon":18,"copper":12},
	"artillery_cannon":{"iron":75,"titanium":45,"nickel":15,"tungsten":10},
}

static func definition(id: String) -> ItemDefinition:
	return load("res://resources/items/%s.tres" % id) as ItemDefinition if id in IDS else null

static func ensure_offers(progress: Resource) -> void:
	if not progress.laboratory_offers.is_empty() or not progress.laboratory_project.is_empty(): return
	var pool := IDS.duplicate()
	for id in progress.laboratory_unlocks: pool.erase(id)
	pool.shuffle()
	for id in pool.slice(0,3): progress.laboratory_offers.append(id)

static func can_start(captain: Resource, id: String) -> bool:
	var progress: Resource = captain.expedition
	if progress.freighter_rooms.get("expansion_1","") != "laboratory" or not progress.laboratory_project.is_empty(): return false
	if id not in progress.laboratory_offers or id not in IDS or progress.laboratory_unlocks.get(id,false): return false
	for key in COSTS[id]:
		if int(captain.minerals.get(key,0)) < int(COSTS[id][key]): return false
	return true

static func start(captain: Resource, id: String) -> bool:
	if not can_start(captain,id): return false
	for key in COSTS[id]: captain.minerals[key] = int(captain.minerals.get(key,0))-int(COSTS[id][key])
	captain.expedition.laboratory_project = id
	captain.expedition.laboratory_duration = research_duration(captain)
	captain.expedition.laboratory_remaining = captain.expedition.laboratory_duration
	captain.emit_changed()
	captain.expedition.emit_changed()
	return true

static func research_duration(captain: Resource) -> float:
	return DURATION * (1.0 - captain.get_skill_bonus("scientist"))

static func advance(progress: Resource, delta: float) -> bool:
	if progress.laboratory_project.is_empty() or delta <= 0.0: return false
	progress.laboratory_remaining = maxf(0.0,progress.laboratory_remaining-delta)
	if progress.laboratory_remaining <= 0.00001:
		progress.laboratory_remaining = 0.0
		progress.laboratory_unlocks[progress.laboratory_project] = true
		progress.laboratory_project = ""
		progress.laboratory_offers.clear()
		ensure_offers(progress)
		progress.emit_changed()
	return true