-- Text Adventure -- main loop (starter).
--
-- Finish the TODOs so the game plays as described in the chapter
-- page.
--
-- Run from this folder:
--   cd projects/04-text-adventure/starter
--   lua main.lua

local world = require("world")

local current_room_id = world.start_id
local inventory = {}

-- TODO: write `describe(room)` that prints:
--   -- <room.name> --
--   <room.description>
--   Items here: <comma-separated items>     (only if room has items)
--   Exits: <comma-separated exit names>
local function describe(room)
    -- your code here
end

-- TODO: write `go(direction)` that looks up the exit on the current
-- room. If the exit exists, change current_room_id and describe the
-- new room. Otherwise print "You cannot go that way."
local function go(direction)
    -- your code here
end

-- TODO: write `take(item_name)` that looks for item_name in the
-- current room's items list. If found, remove it from the room and
-- add it to inventory. Print confirmation. If not found, print
-- "There is no <item> here." Return true if the player just picked
-- up the gold coin so the main loop can end.
local function take(item_name)
    -- your code here
    return false
end

-- TODO: write `show_inventory()` that prints inventory items
-- separated by commas. If empty, print "You are carrying nothing."
local function show_inventory()
    -- your code here
end

-- Helper: split a typed line into a verb and an argument.
local function parse(input)
    local words = {}
    for w in string.gmatch(input, "%S+") do
        table.insert(words, w)
    end
    local verb = words[1]
    local arg = words[2]
    -- Items like "gold coin" are two words. Join everything after the
    -- verb into one argument string.
    if #words > 2 then
        arg = table.concat(words, " ", 2)
    end
    return verb, arg
end

describe(world.rooms[current_room_id])

while true do
    io.write("> ")
    local input = io.read()
    if input == nil then break end

    local verb, arg = parse(input)

    -- TODO: dispatch the verb to the right function.
    -- Suggested verbs: look, go, take, inv, quit.
    -- Remember to break out of the loop after quit or after take()
    -- returns true (gold coin picked up).
end