#!/bin/bash

# omarchy:summary=Restore channel and regional pacman defaults in an installed target
# omarchy:args=<stable|rc|edge> [target-root]
# omarchy:requires-sudo=true
# omarchy:hidden=true

set -euo pipefail

if (( $# < 1 || $# > 2 )); then
  echo "Usage: omarchy-apply-pacman <stable|rc|edge> [target-root]" >&2
  exit 1
fi

channel="$1"
case "$channel" in
  stable|rc|edge) ;;
  *) echo "Invalid pacman channel: $channel" >&2; exit 1 ;;
esac

# The ISO writes this plain-text marker before target finalization. Missing
# markers keep existing installations global; never source it as shell code.
etc="${2:-/}/etc"
region=global
if [[ -e $etc/omarchy/region ]]; then
  region=$(<"$etc/omarchy/region")
fi
case "$region" in
  global|cn) ;;
  *) echo "Unsupported region: $region (expected global or cn)" >&2; exit 1 ;;
esac

# Build both files before replacing either. Explicit refreshes retain backups;
# ordinary updates do not call this command or enforce regional defaults.
staging=$(mktemp -d)
trap 'rm -rf "$staging"' EXIT
cp "$OMARCHY_PATH/default/pacman/pacman-$channel.conf" "$staging/pacman.conf"
cp "$OMARCHY_PATH/default/pacman/mirrorlist-$channel" "$staging/mirrorlist"
if [[ $region != "global" ]]; then
  profile="$OMARCHY_PATH/default/regions/$region/pacman"
  printf '\n' >> "$staging/pacman.conf"
  cat "$profile/pacman.conf.append" >> "$staging/pacman.conf"
  cat "$profile/mirrorlist.append" >> "$staging/mirrorlist"
fi

mkdir -p "$etc/pacman.d"
for file in pacman.conf pacman.d/mirrorlist; do
  if [[ -e $etc/$file ]]; then
    cp -f "$etc/$file" "$etc/$file.bak"
  fi
done
install -m 644 "$staging/pacman.conf" "$etc/pacman.conf"
install -m 644 "$staging/mirrorlist" "$etc/pacman.d/mirrorlist"