--[[
  tests/probes_config.lua — regression tests for the three testbed bugs:
    1. probes.all() must accept per-WAN tcp targets (tables or
       "host:port" strings) instead of dereferencing a nil global.
    2. config.load() must find UCI wan sections named wan_a / wan_b
       (hyphens are not valid UCI identifiers) and map them onto the
       internal wan-a / wan-b ids.
    3. main.lua --dry-run: covered by the daemon dry-run smoke check
       ("(DRY RUN)" banner + "exited after 1 cycles").

  Pure-Lua, no root, no network (exec is not invoked by these paths
  except via injected stubs / disabled probes).
]]

package.path = package.path .. ";./src/?.lua"

local probes = require("balancerlite.probes")
local config = require("balancerlite.config")

local passed = 0
local failed = 0
local function check(name, ok, detail)
  if ok then
    passed = passed + 1
    print("  PASS  " .. name)
  else
    failed = failed + 1
    print("  FAIL  " .. name .. (detail and ("  " .. detail) or ""))
  end
end

-- -----------------------------------------------------------------
-- TEST 1: probes.all with per-WAN tcp targets (the drive_cycle crash)
-- -----------------------------------------------------------------
print("\n[1] probes.all per-WAN tcp targets")
do
  -- All probe types disabled except TCP; use a dead local port so
  -- nc fails fast (connect refused, no network dependency).
  local P = probes.new({
    tcp_targets  = {},               -- global list intentionally empty
    tcp_enabled  = true,
    icmp_enabled = false,
    dns_enabled  = false,
    wg_enabled   = false,
    tcp_timeout  = 1,
  })

  -- Table form
  local r = probes.all(P, "lo", { { host = "127.0.0.1", port = 1 } }, nil)
  check("returns 1 result", #r == 1, "got " .. tostring(#r))
  check("probe is tcp", r[1] and r[1].name == "tcp")
  check("no crash on empty global list", true)

  -- String form
  local P2 = probes.new({
    tcp_targets  = {},
    tcp_enabled  = true,
    icmp_enabled = false,
    dns_enabled  = false,
    wg_enabled   = false,
    tcp_timeout  = 1,
  })
  local r2 = probes.all(P2, "lo", { "127.0.0.1:1" }, nil)
  check("string form returns 1 result", #r2 == 1, "got " .. tostring(#r2))
  check("string form probe is tcp", r2[1] and r2[1].name == "tcp")

  -- nil override → falls back to global list
  local P3 = probes.new({
    tcp_targets  = { { host = "127.0.0.1", port = 1 } },
    tcp_enabled  = true,
    icmp_enabled = false,
    dns_enabled  = false,
    wg_enabled   = false,
    tcp_timeout  = 1,
  })
  local r3 = probes.all(P3, "lo", nil, nil)
  check("nil override uses global", #r3 == 1, "got " .. tostring(#r3))

  -- Empty per-WAN list → no tcp probes at all
  local P4 = probes.new({
    tcp_targets  = { { host = "127.0.0.1", port = 1 } },
    tcp_enabled  = true,
    icmp_enabled = false,
    dns_enabled  = false,
    wg_enabled   = false,
  })
  local r4 = probes.all(P4, "lo", {}, nil)
  check("empty override yields no results", #r4 == 0, "got " .. tostring(#r4))
end

-- -----------------------------------------------------------------
-- TEST 2: config.load maps UCI wan_a/wan_b sections to wan-a/wan-b
-- -----------------------------------------------------------------
print("\n[2] config.load wan section naming")
do
  local dir = "/tmp/bl_pcfg_" .. tostring(os.time()) .. "_" ..
              tostring(math.random(1000000))
  os.execute("mkdir -p " .. dir)
  local p = dir .. "/balancerlite"
  local f = io.open(p, "w")
  f:write([[
config general 'general'
    option host 'unit-test'

config health 'health'
    option probe_interval '1s'

config wan 'wan_a'
    option interface    'eth10'
    option address      '192.0.2.10/24'
    option gateway      '192.0.2.1'
    option preference   '90'

config wan 'wan_b'
    option interface    'eth11'
    option address      '198.51.100.10/24'
    option gateway      '198.51.100.1'
    option preference   '10'
]])
  f:close()

  local cfg, err = config.load(p)
  check("config loads", cfg ~= nil, tostring(err))
  check("two wans parsed", cfg and #cfg.wans == 2,
        cfg and tostring(#cfg.wans))
  check("wan-a interface from wan_a section",
        cfg and cfg.wans[1].interface == "eth10",
        cfg and tostring(cfg.wans[1].interface))
  check("wan-a address from wan_a section",
        cfg and cfg.wans[1].address == "192.0.2.10/24",
        cfg and tostring(cfg.wans[1].address))
  check("wan-a gateway from wan_a section",
        cfg and cfg.wans[1].gateway == "192.0.2.1",
        cfg and tostring(cfg.wans[1].gateway))
  check("wan-a preference from wan_a section",
        cfg and cfg.wans[1].preference == 90,
        cfg and tostring(cfg.wans[1].preference))
  check("wan-b interface from wan_b section",
        cfg and cfg.wans[2].interface == "eth11",
        cfg and tostring(cfg.wans[2].interface))
  check("wan-b gateway from wan_b section",
        cfg and cfg.wans[2].gateway == "198.51.100.1",
        cfg and tostring(cfg.wans[2].gateway))
  os.execute("rm -rf " .. dir)
end

-- -----------------------------------------------------------------
-- TEST 3: config.load still accepts hyphenated wan-a/wan-b sections
-- (back-compat)
-- -----------------------------------------------------------------
print("\n[3] config.load hyphenated sections (back-compat)")
do
  local dir = "/tmp/bl_pcfg2_" .. tostring(os.time()) .. "_" ..
              tostring(math.random(1000000))
  os.execute("mkdir -p " .. dir)
  local p = dir .. "/balancerlite"
  local f = io.open(p, "w")
  f:write([[
config wan 'wan-a'
    option interface 'eth20'
    option gateway   '10.20.0.1'

config wan 'wan-b'
    option interface 'eth21'
    option gateway   '10.21.0.1'
]])
  f:close()

  local cfg, err = config.load(p)
  check("config loads", cfg ~= nil, tostring(err))
  check("wan-a interface from wan-a section",
        cfg and cfg.wans[1].interface == "eth20",
        cfg and tostring(cfg.wans[1].interface))
  check("wan-b interface from wan-b section",
        cfg and cfg.wans[2].interface == "eth21",
        cfg and tostring(cfg.wans[2].interface))
  os.execute("rm -rf " .. dir)
end

-- -----------------------------------------------------------------
-- TEST 4: no wan sections at all → defaults, no crash
-- -----------------------------------------------------------------
print("\n[4] config.load zero wan sections")
do
  local dir = "/tmp/bl_pcfg3_" .. tostring(os.time()) .. "_" ..
              tostring(math.random(1000000))
  os.execute("mkdir -p " .. dir)
  local p = dir .. "/balancerlite"
  local f = io.open(p, "w")
  f:write([[
config general 'general'
    option host 'nowan'
]])
  f:close()

  local cfg, err = config.load(p)
  check("config loads", cfg ~= nil, tostring(err))
  check("two wans defaulted", cfg and #cfg.wans == 2)
  check("default iface eth0", cfg and cfg.wans[1].interface == "eth0",
        cfg and tostring(cfg.wans[1].interface))
  os.execute("rm -rf " .. dir)
end

-- -----------------------------------------------------------------
-- Done
-- -----------------------------------------------------------------
print(string.format("\n=== probes_config: %d/%d passed ===",
      passed, passed + failed))
if failed > 0 then os.exit(1) end