# GPD Win Mini 2025 PipeWire EQ configuration
# Based on https://github.com/aarron-lee/gpd-win-tricks/tree/main/win_mini_equalizer
# Credit: @BrotherChenwk from the GPD Discord
{ pkgs, ... }:

let
  # The ALSA output device - may need adjustment based on PCI enumeration
  # Use `pactl list sinks short` or `pw-cli list-objects | grep alsa_output` to find the correct device
  alsaDevice = "alsa_output.pci-0000_c4_00.6.analog-stereo";

  pipewireConfig = pkgs.writeTextDir "share/pipewire/pipewire.conf.d/gpd-win-mini-2025.conf" ''
    # GPD Win Mini 2025 speaker EQ
    # Compensates for the small speakers' frequency response deficiencies
    context.modules = [
        { name = libpipewire-module-filter-chain
            args = {
                node.description = "GPD Win Mini EQ"
                media.name       = "GPD Win Mini EQ"
                filter.graph = {
                    nodes = [
                        {
                            type  = builtin
                            name  = eq_band_1
                            label = bq_lowshelf
                            control = { "Freq" = 32.0 "Q" = 1.41 "Gain" = -10.0 }
                        }
                        {
                            type  = builtin
                            name  = eq_band_2
                            label = bq_peaking
                            control = { "Freq" = 64.0 "Q" = 1.41 "Gain" = -10.0 }
                        }
                        {
                            type  = builtin
                            name  = eq_band_3
                            label = bq_peaking
                            control = { "Freq" = 125.0 "Q" = 1.41 "Gain" = 6.0 }
                        }
                        {
                            type  = builtin
                            name  = eq_band_4
                            label = bq_peaking
                            control = { "Freq" = 250.0 "Q" = 1.41 "Gain" = -3.0 }
                        }
                        {
                            type  = builtin
                            name  = eq_band_5
                            label = bq_peaking
                            control = { "Freq" = 500.0 "Q" = 1.41 "Gain" = 0.0 }
                        }
                        {
                            type  = builtin
                            name  = eq_band_6
                            label = bq_peaking
                            control = { "Freq" = 1000.0 "Q" = 1.41 "Gain" = -1.0 }
                        }
                        {
                            type  = builtin
                            name  = eq_band_7
                            label = bq_peaking
                            control = { "Freq" = 2000.0 "Q" = 1.41 "Gain" = -1.0 }
                        }
                        {
                            type  = builtin
                            name  = eq_band_8
                            label = bq_peaking
                            control = { "Freq" = 4000.0 "Q" = 1.41 "Gain" = 0.0 }
                        }
                        {
                            type  = builtin
                            name  = eq_band_9
                            label = bq_peaking
                            control = { "Freq" = 8000.0 "Q" = 1.41 "Gain" = 2.0 }
                        }
                        {
                            type  = builtin
                            name  = eq_band_10
                            label = bq_peaking
                            control = { "Freq" = 16000.0 "Q" = 2.0 "Gain" = 6.0 }
                        }
                        {
                            type  = builtin
                            name  = eq_band_11
                            label = bq_highshelf
                            control = { "Freq" = 4000.0 "Q" = 1.0 "Gain" = 6.0 }
                        }
                    ]
                    links = [
                        { output = "eq_band_1:Out" input = "eq_band_2:In" }
                        { output = "eq_band_2:Out" input = "eq_band_3:In" }
                        { output = "eq_band_3:Out" input = "eq_band_4:In" }
                        { output = "eq_band_4:Out" input = "eq_band_5:In" }
                        { output = "eq_band_5:Out" input = "eq_band_6:In" }
                        { output = "eq_band_6:Out" input = "eq_band_7:In" }
                        { output = "eq_band_7:Out" input = "eq_band_8:In" }
                        { output = "eq_band_8:Out" input = "eq_band_9:In" }
                        { output = "eq_band_9:Out" input = "eq_band_10:In" }
                        { output = "eq_band_10:Out" input = "eq_band_11:In" }
                    ]
                }

                audio.channels = 2
                audio.position = [ FL FR ]
                capture.props = {
                    node.name   = "GPD Win Mini EQ"
                    media.class = Audio/Sink
                    priority.driver = 1009
                    priority.session = 1009
                }
                playback.props = {
                    node.name   = "GPD Win Mini EQ Fixed"
                    node.passive = true
                    node.target = "${alsaDevice}"
                }
            }
        }
    ]
  '';
in
{
  services.pipewire.configPackages = [ pipewireConfig ];
}