--[[
  clip-notify.lua  v3
  ───────────────────────────────────────────────────────
  "Clip Saved" chime for OBS Studio.
  Plays a sound + logs to OBS when the replay buffer saves.

  Install:
    1. Place this file + your .wav in the same folder.
    2. OBS → Tools → Scripts → "+" → select clip-notify.lua
    3. Set your chime file & volume, hit Test.
  ───────────────────────────────────────────────────────
--]]

obs = obslua

local cfg = {
  play_sound       = true,
  sound_path       = "",
  chime_volume     = 80,   -- 0–100
  notify_on_record = false,
}

-- ── Platform ──────────────────────────────────────────
local is_windows = package.config:sub(1,1) == "\\"
local is_mac, is_linux = false, false
if not is_windows then
  local f = io.popen("uname -s 2>/dev/null")
  if f then
    local u = f:read("*l"); f:close()
    is_mac   = (u == "Darwin")
    is_linux = not is_mac
  end
end

-- ── FFI (Windows only) ────────────────────────────────
local ffi, winmm
local ffi_ok = false

if is_windows then
  local ok; ok, ffi = pcall(require, "ffi")
  if ok then
    ffi.cdef[[
      /* winmm */
      int   __stdcall PlaySoundA(const char* pszSound, void* hmod, unsigned long fdwSound);
      unsigned long __stdcall waveOutSetVolume(void* hwo, unsigned long dwVolume);
      unsigned long __stdcall waveOutGetVolume(void* hwo, unsigned long* pdwVolume);
    ]]
    local ok2; ok2, winmm = pcall(ffi.load, "winmm")
    ffi_ok = ok2
    if ffi_ok then
      obs.blog(obs.LOG_INFO, "[clip-notify] winmm FFI ready")
    else
      obs.blog(obs.LOG_WARNING, "[clip-notify] winmm failed to load — sound disabled")
    end
  end
end

-- ── Volume helpers ────────────────────────────────────
-- waveOutSetVolume: low word = left, high word = right (each 0x0000–0xFFFF)
local function pct_to_dword(pct)
  local v = math.floor((math.max(0, math.min(100, pct)) / 100) * 0xFFFF)
  return v + v * 0x10000
end

-- ── Sound playback ────────────────────────────────────
local SND_FILENAME  = 0x00020000
local SND_ASYNC     = 0x00000001
local SND_NODEFAULT = 0x00000002

local function play_chime(path)
  if not cfg.play_sound or path == "" then return end

  if is_windows then
    if not ffi_ok then return end

    -- Save current wave-out volume
    local prev = ffi.new("unsigned long[1]", 0)
    winmm.waveOutGetVolume(nil, prev)
    local saved = prev[0]

    -- Apply our volume
    winmm.waveOutSetVolume(nil, pct_to_dword(cfg.chime_volume))

    -- Fire async — returns immediately
    winmm.PlaySoundA(path, nil, SND_FILENAME + SND_ASYNC + SND_NODEFAULT)

    -- Restore original volume after the chime has finished (1.5s headroom)
    obs.timer_add(function()
      winmm.waveOutSetVolume(nil, saved)
      obs.remove_current_callback()
    end, 1500)

  elseif is_mac then
    -- afplay -v accepts 0.0–1.0
    local vol = string.format("%.2f", cfg.chime_volume / 100)
    os.execute(string.format('afplay -v %s "%s" &', vol, path))

  elseif is_linux then
    -- paplay --volume: 0–65536 (100% = 65536)
    local vol = math.floor((cfg.chime_volume / 100) * 65536)
    os.execute(string.format(
      'paplay --volume=%d "%s" 2>/dev/null || aplay "%s" 2>/dev/null &',
      vol, path, path))
  end
end

-- ── Handlers ─────────────────────────────────────────
local function on_clip_saved()
  play_chime(cfg.sound_path)
  local filename = ""
  if obs.obs_frontend_get_last_replay ~= nil then
    local raw = obs.obs_frontend_get_last_replay()
    if raw and raw ~= "" then
      filename = raw:match("([^/\\]+)$") or raw
    end
  end
  obs.blog(obs.LOG_INFO, "[clip-notify] Clip saved → " .. (filename ~= "" and filename or "done"))
end

local function on_recording_saved()
  if not cfg.notify_on_record then return end
  play_chime(cfg.sound_path)
  obs.blog(obs.LOG_INFO, "[clip-notify] Recording saved.")
end

local function on_event(event)
  if     event == obs.OBS_FRONTEND_EVENT_REPLAY_BUFFER_SAVED then on_clip_saved()
  elseif event == obs.OBS_FRONTEND_EVENT_RECORDING_STOPPED   then on_recording_saved()
  end
end

-- ── Script UI ─────────────────────────────────────────
function script_properties()
  local p = obs.obs_properties_create()

  obs.obs_properties_add_bool(p, "play_sound", "Enable chime sound")

  obs.obs_properties_add_path(p, "sound_path",
    "Chime sound file (.wav)",
    obs.OBS_PATH_FILE,
    "WAV Files (*.wav);;All Files (*.*)",
    script_path())

  obs.obs_properties_add_int_slider(p, "chime_volume", "Volume", 0, 100, 1)

  obs.obs_properties_add_bool(p, "notify_on_record",
    "Also chime when a recording is saved")

  obs.obs_properties_add_button(p, "test_btn", "▶  Test Chime Now",
    function() on_clip_saved(); return true end)

  return p
end

function script_defaults(s)
  obs.obs_data_set_default_bool  (s, "play_sound",       true)
  obs.obs_data_set_default_string(s, "sound_path",       "")
  obs.obs_data_set_default_int   (s, "chime_volume",     80)
  obs.obs_data_set_default_bool  (s, "notify_on_record", false)
end

function script_update(s)
  cfg.play_sound       = obs.obs_data_get_bool  (s, "play_sound")
  cfg.sound_path       = obs.obs_data_get_string(s, "sound_path")
  cfg.chime_volume     = obs.obs_data_get_int   (s, "chime_volume")
  cfg.notify_on_record = obs.obs_data_get_bool  (s, "notify_on_record")
  if cfg.sound_path == "" then
    cfg.sound_path = script_path() .. "clip-saved.wav"
  end
end

function script_load(s)
  script_update(s)
  obs.obs_frontend_add_event_callback(on_event)
  obs.blog(obs.LOG_INFO, "[clip-notify] v3 loaded.")
end

function script_unload()
  obs.blog(obs.LOG_INFO, "[clip-notify] Unloaded.")
end

function script_description()
  return [[<h3>🎬 Clip Notify &nbsp;<small>v3</small></h3>
<p>Plays a chime the moment your replay buffer clip is saved.</p>
<p><b>Windows:</b> native winmm — no subprocess, instant.<br>
<b>macOS:</b> afplay &nbsp;|&nbsp; <b>Linux:</b> paplay / aplay</p>
<br>
<b>Setup:</b> pick your .wav, set volume, hit <b>Test Chime Now</b>.]]
end