-- manager/config.lua — Configuration constants, data tables, and lookup structures
-- Usage: local cfg = dofile("manager/config.lua")(log)

return function(log)

local C = {}

-------------------------------------------------
-- Default configuration (overridden by .manager_config)
-------------------------------------------------

C.DROPPER_NAME      = "minecraft:dropper_9"
C.BARREL_NAME       = "minecraft:barrel_0"
C.POLL_INTERVAL     = 2
C.MONITOR_SIDE      = "left"
C.SCAN_INTERVAL     = 120
C.SMELT_INTERVAL    = 3
C.SMELT_RESERVE     = 128
C.DEFRAG_INTERVAL   = 600
C.COMPOST_INTERVAL  = 3
C.ALERT_INTERVAL    = 15
C.CACHE_FILE        = ".inventory_cache"
C.SMELTER_MONITOR_SIDE = "top"
C.DISABLED_RECIPES_FILE = ".disabled_recipes"

-- Network
C.BROADCAST_CHANNEL  = 4200
C.ORDER_CHANNEL      = 4201
C.BROADCAST_INTERVAL = 1
C.CRAFT_CHANNEL      = 4203
C.CRAFT_REPLY_CHANNEL = 4204
C.SYSTEM_CHANNEL     = 4205

-- Crafting
C.CRAFT_TIMEOUT      = 15
C.GRID_TO_SLOT       = {1, 2, 3, 5, 6, 7, 9, 10, 11}

-- Compost (overridable via config file)
C.COMPOST_RESERVE    = 128
C.COMPOST_DROPPER    = "minecraft:dropper_10"
C.COMPOST_HOPPER     = "minecraft:hopper_0"

-- Peripheral
C.PERIPHERAL_CACHE_TTL = 5

-- Furnace types
C.FURNACE_TYPES = {
    "minecraft:furnace",
    "minecraft:smoker",
    "minecraft:blast_furnace",
}
C.SLOT_INPUT  = 1
C.SLOT_FUEL   = 2
C.SLOT_OUTPUT = 3

-------------------------------------------------
-- Config file loader
-------------------------------------------------

local CONFIG_FILE = ".manager_config"

function C.loadConfig()
    if not fs.exists(CONFIG_FILE) then return end
    local f = fs.open(CONFIG_FILE, "r")
    local data = f.readAll()
    f.close()
    local ok, cfg = pcall(textutils.unserialiseJSON, data)
    if not ok or not cfg then
        log.warn("CONFIG", "Failed to parse %s", CONFIG_FILE)
        return
    end
    C._raw = cfg
    if cfg.dropperName        then C.DROPPER_NAME        = cfg.dropperName        end
    if cfg.barrelName         then C.BARREL_NAME          = cfg.barrelName         end
    if cfg.monitorSide        then C.MONITOR_SIDE         = cfg.monitorSide        end
    if cfg.smelterMonitorSide then C.SMELTER_MONITOR_SIDE = cfg.smelterMonitorSide end
    if cfg.pollInterval       then C.POLL_INTERVAL        = cfg.pollInterval       end
    if cfg.scanInterval       then C.SCAN_INTERVAL        = cfg.scanInterval       end
    if cfg.smeltInterval      then C.SMELT_INTERVAL       = cfg.smeltInterval      end
    if cfg.defragInterval     then C.DEFRAG_INTERVAL      = cfg.defragInterval     end
    if cfg.compostInterval    then C.COMPOST_INTERVAL     = cfg.compostInterval    end
    if cfg.alertInterval      then C.ALERT_INTERVAL       = cfg.alertInterval      end
    if cfg.broadcastInterval  then C.BROADCAST_INTERVAL   = cfg.broadcastInterval  end
    if cfg.smeltReserve       then C.SMELT_RESERVE        = cfg.smeltReserve       end
    if cfg.broadcastChannel   then C.BROADCAST_CHANNEL    = cfg.broadcastChannel   end
    if cfg.orderChannel       then C.ORDER_CHANNEL        = cfg.orderChannel       end
    if cfg.craftChannel       then C.CRAFT_CHANNEL        = cfg.craftChannel       end
    if cfg.craftReplyChannel  then C.CRAFT_REPLY_CHANNEL  = cfg.craftReplyChannel  end
    if cfg.compostReserve     then C.COMPOST_RESERVE      = cfg.compostReserve     end
    if cfg.compostDropper     then C.COMPOST_DROPPER      = cfg.compostDropper     end
    if cfg.compostHopper      then C.COMPOST_HOPPER       = cfg.compostHopper      end
    if cfg.logLevel           then log.setLevel(cfg.logLevel)                      end
    log.info("CONFIG", "Loaded from %s", CONFIG_FILE)
end

-------------------------------------------------
-- Data tables
-------------------------------------------------

C.SMELTABLE        = dofile("data/smeltable.lua")
C.FUEL_LIST        = dofile("data/fuel.lua")
local _compostData = dofile("data/compostable.lua")
C.COMPOSTABLE      = _compostData.items
C.COMPOST_TRASH    = _compostData.trash
C.CRAFTABLE        = dofile("data/craftable.lua")
C.LOW_STOCK_ALERTS = dofile("data/alerts.lua")

-- Pre-build furnace compatibility sets for O(1) lookup
for _, recipe in pairs(C.SMELTABLE) do
    recipe.furnaceSet = {}
    for _, ft in ipairs(recipe.furnaces) do
        recipe.furnaceSet[ft] = true
    end
end

-- Pre-built smelt candidate lists per furnace type
C.smeltCandidatesByType = {}
do
    for _, ftype in ipairs(C.FURNACE_TYPES) do
        C.smeltCandidatesByType[ftype] = {}
    end
    for itemName, recipe in pairs(C.SMELTABLE) do
        local isFood = recipe.furnaceSet["minecraft:smoker"] or false
        for ft, _ in pairs(recipe.furnaceSet) do
            table.insert(C.smeltCandidatesByType[ft], { name = itemName, recipe = recipe, food = isFood })
        end
    end
    for _, list in pairs(C.smeltCandidatesByType) do
        table.sort(list, function(a, b)
            if a.food ~= b.food then return a.food end
            return a.name < b.name
        end)
    end
end

-- Build fuel set for quick lookup
C.FUEL_SET = {}
for _, f in ipairs(C.FUEL_LIST) do C.FUEL_SET[f.name] = true end

-- Build compostable set for quick lookup
C.COMPOSTABLE_SET = {}
for _, name in ipairs(C.COMPOSTABLE) do C.COMPOSTABLE_SET[name] = true end

return C

end