local policies_key = KEYS[1]
local policies_json = ARGV[1]

local decoded, policies = pcall(cjson.decode, policies_json or '')
if not decoded or type(policies) ~= 'table' then
    return cjson.encode({status = 'invalid'})
end

local seen = {}
for _, policy in ipairs(policies) do
    if type(policy) ~= 'table' or type(policy.upstreamId) ~= 'string' or policy.upstreamId == '' or
        type(policy.revision) ~= 'string' or not string.match(policy.revision, '^[0-9]+$') or
        policy.revision == '0' or type(policy.enabled) ~= 'boolean' or seen[policy.upstreamId] then
        return cjson.encode({status = 'invalid'})
    end
    seen[policy.upstreamId] = true
end

redis.call('DEL', policies_key)
for _, policy in ipairs(policies) do
    redis.call('HSET', policies_key, policy.upstreamId, cjson.encode(policy))
end
return cjson.encode({status = 'ok'})