-- Testing
local async function iter(i)
    asyncio.yield(0)
    for i = 1, 5 do
        print('Waiting 1 second because iterators')
        asyncio.sleep(1)
        print('Finished waiting, yield-ing ' .. i .. '...')
        asyncio.yield('#' .. i)
    end

    print('Finished iterating!')
end

print('Hello from the test file, waiting for other mods to load...')
asyncio.defer()
print('Done, starting iteration.')

async for i, _ in iter(1) do
    print('Hello from the asyncio code!')
    print('Got ' .. i)
end

print('Iterating over all items')
async for k, _ in asyncio.pairs(minetest.registered_items) do
    print('Heavy operation:', k)
end
print('Done')

minetest.register_chatcommand('/alua', {
    privs = {server=true},
    help = 'Executes asyncio lua commands.',

    -- This function has to use minetest.chat_send_player as it is executed
    --  asynchronously and return values aren't sent to non-asynchronous
    --  functions.
    func = async function(name, param)
        local func, msg = asyncio.loadstring(param)
        if not func then
            minetest.chat_send_player(name, 'Load error: ' .. tostring(msg))
            return
        end
        local good, msg = pcall(func)
        if good then
            minetest.chat_send_player(name, 'Code executed.')
        else
            minetest.chat_send_player(name, 'Error executing code: ' ..
                tostring(msg))
        end
    end,
})

-- More testing
local lock = asyncio.Lock()
local async function do_something()
    print('Acquiring lock...')
    lock:acquire()
    print('Acquired the lock, doing something...')
    asyncio.sleep(5)
    print('Releasing the lock...')
    lock:release()
end

for i = 1, 5 do
    asyncio.run_async(do_something)
end

-- Wait for the above functions to finish.
lock:acquire()
lock:release()

-- Events
local event = asyncio.Event()
local async function do_something_else()
    print('Waiting on the event...')
    event:wait()
    print('Event triggered, waiting 5 seconds.')
    asyncio.sleep(5)
    print('Done.')
end

for i = 1, 5 do
    asyncio.run_async(do_something_else)
end

-- Set the event
asyncio.sleep(5)
print('Running event:set()...')
event:set()
print('Finished running event:set().')