-- S3 (+S4): 80% GET single / 15% GET list / 5% POST.
-- The mix exposes the store-actor channel round-trip on urus, mutex
-- contention on axum, and gen_server message-pass on cowboy without
-- making writes the bottleneck.

-- Locate common.lua next to this script regardless of cwd (see s2 for why).
package.path = (debug.getinfo(1, "S").source:match("^@(.*[/\\])") or "./") .. "?.lua;" .. package.path
local common = require("common")
wrk.headers = common.headers
wrk.headers["Content-Type"] = "application/json"

math.randomseed(os.time() + (os.getpid and os.getpid() or 0))

-- A small pool of pre-built JSON bodies. Building one fresh per request
-- in Lua would taint the bench with Lua's GC overhead.
local body_pool = {}
for i = 1, 64 do
  body_pool[i] = string.format(
    [[{"name":"user%d","email":"u%d@example.test"}]], i, i)
end

request = function()
  local r = math.random()
  if r < 0.80 then
    return wrk.format("GET", "/api/v1/users/" .. math.random(1, 10000))
  elseif r < 0.95 then
    return wrk.format("GET", "/api/v1/users")
  else
    local body = body_pool[math.random(1, #body_pool)]
    return wrk.format("POST", "/api/v1/users", nil, body)
  end
end