#!/usr/bin/env zsh
# Minimal PipeWire sink cycler using starred lines from wpctl status.
# Deps: pw-dump, jq, wpctl

set -euo pipefail

# Collect sink IDs (Audio/Sink nodes)
sinks=($(pw-dump | jq -r '.[] | select(.info.props."media.class"=="Audio/Sink") | .id'))
(( ${#sinks} )) || exit 0

# Get all lines containing a star (default indicators for various classes)
starred=$(wpctl status | grep -F '*') || true

# Extract numbers (IDs) from starred lines (the number before the first dot after the star)
typeset -a star_ids
while IFS= read -r line; do
  # Match: * <spaces> <number>.
  if [[ $line =~ [*][[:space:]]*([0-9]+)\. ]]; then
    star_ids+=("${match[1]}")
  fi
done <<< "$starred"

# Find first starred ID that is actually one of our sinks
current=""
for cid in "${star_ids[@]}"; do
  for s in "${sinks[@]}"; do
    if [[ $cid == $s ]]; then
      current=$cid
      break 2
    fi
  done
done

# Fallback if no starred sink matched
[[ -z $current ]] && current=${sinks[1]}

# Locate index of current in sinks (zsh arrays are 1-based)
idx=1
for i in {1..${#sinks[@]}}; do
  [[ ${sinks[$i]} == "$current" ]] && { idx=$i; break; }
done

# Compute next sink (wrap)
next=${sinks[$(( (idx % ${#sinks}) + 1 ))]}

# Switch default
wpctl set-default "$next" >/dev/null 2>&1 || exit 1

echo "Switched to sink $next"