local mp = require 'mp'


local auto_change = true
local av_map = {
    ["default"]      = "auto",
    ["DELL U2312HM"] = "coreaudio/AppleUSBAudioEngine:FiiO:DigiHug USB Audio:1a160000:3", -- FiiO DAC
    ["SONY TV  *00"] = "coreaudio/AppleGFXHDAEngineOutputDP:0:{D94D-8204-01010101}", -- HDMI
    ["Color LCD"]    = "coreaudio/AppleHDAEngineOutput:1B,0,1,1:0", -- Built-in
}

function set_audio_device(obs_display)
    if obs_display ~= nil and not auto_change then
        return
    end
    
    local display = obs_display or mp.get_property_native("display-names")
    if not display or not display[1] then
        --print("Invalid display return value: " .. tostring(display))
        return
    end

    local new_adev = av_map[display[1]] or av_map["default"]
    local current_adev = mp.get_property("audio-device", av_map["default"])
    if new_adev ~= current_adev then
        mp.osd_message("Audio device: " .. new_adev)
        mp.set_property("audio-device", new_adev)
    end
end

mp.observe_property("display-names", "native", function(name, value) set_audio_device(value) end)
mp.add_key_binding("", "set-audio-device", function() set_audio_device(nil) end)
mp.add_key_binding("", "toggle-switching", function() 
    auto_change = not auto_change
    mp.osd_message("Audio device switching: " .. tostring(auto_change)) 
end)