local timestamp = tonumber(ARGV[1])
local limit = tonumber(ARGV[2])
local expiry = tonumber(ARGV[3])
local amount = tonumber(ARGV[4])

if amount > limit then
    return false
end

local entry = redis.call('lindex', KEYS[1], limit - amount)

if entry and tonumber(entry) >= timestamp - expiry then
    return false
end

for i = 1, amount do
    redis.call('lpush', KEYS[1], timestamp)
end

redis.call('ltrim', KEYS[1], 0, limit - 1)
redis.call('expire', KEYS[1], expiry)

return true