#!/bin/bash
# =============================================================================
# plugin/sbin/podman-config.sh
#
# "Konfiguration anlegen" — creates and synchronizes unraid-podman's
# configuration. Has two responsibilities, run as two subcommands:
#
#   podman-config.sh seed
#     First-install (or "file went missing") step: ensures
#     /boot/config/plugins/podman/ exists with its full directory skeleton,
#     and copies default config templates into it — but ONLY for files that
#     don't already exist. This is what makes plugin updates safe: an
#     existing user configuration is never overwritten (see
#     docs/ARCHITECTURE.md section 3.2 and section 7).
#
#   podman-config.sh sync
#     Boot-time step: copies the current, authoritative config from
#     /boot/config/plugins/podman/*.conf into /etc/containers/ (which lives
#     on Unraid's RAM-root and is empty again after every reboot). Run by
#     rc.podman on every `start`.
#
# Template source: the plugin ships its default config templates (from this
# repo's config/) to /usr/local/share/unraid-podman/templates/ at install
# time (see plugin/podman.plg) — that is what `seed` copies FROM, and
# /boot/config/plugins/podman/ is what it copies TO.
#
# Usage:
#   podman-config.sh seed
#   podman-config.sh sync
# =============================================================================

set -eu

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# shellcheck source=./podman-common.sh
. "$SCRIPT_DIR/podman-common.sh"

TEMPLATES_DIR="/usr/local/share/unraid-podman/templates"

# -----------------------------------------------------------------------------
# seed_file <template-filename> <dest-path>
#
# Copies a template into place only if the destination doesn't already
# exist. This single rule is what protects user customizations across
# plugin updates — see docs/ARCHITECTURE.md section 7, "Persistenz-Strategie".
# -----------------------------------------------------------------------------
seed_file() {
  local template_name="$1"
  local dest_path="$2"
  local src_path="$TEMPLATES_DIR/$template_name"

  if [ -f "$dest_path" ]; then
    podman_log "config: $dest_path already exists, leaving untouched"
    return 0
  fi

  if [ ! -f "$src_path" ]; then
    podman_log_error "config: template missing: $src_path (plugin install incomplete?)"
    return 1
  fi

  mkdir -p "$(dirname "$dest_path")"
  cp "$src_path" "$dest_path"
  podman_log "config: seeded $dest_path from template $template_name"
}

cmd_seed() {
  podman_log "config: seeding /boot/config/plugins/podman/ (first install or repair)"

  # Full directory skeleton — see docs/ARCHITECTURE.md section 4.1 and
  # plugin/boot-config/plugins/podman/README.md for the reference layout.
  mkdir -p \
    "$PODMAN_BOOT_DIR" \
    "$PODMAN_NETWORKS_BOOT_DIR" \
    "$PODMAN_BACKUP_DIR/packages" \
    "$PODMAN_BACKUP_DIR/config"

  seed_file "podman.cfg.example"   "$PODMAN_CFG_FILE"
  seed_file "containers.conf"      "$PODMAN_BOOT_DIR/containers.conf"
  seed_file "storage.conf"         "$PODMAN_BOOT_DIR/storage.conf"
  seed_file "registries.conf"      "$PODMAN_BOOT_DIR/registries.conf"
  seed_file "policy.json"          "$PODMAN_BOOT_DIR/policy.json"

  # Autostart files: empty by default, `touch` is the "seed" here (no
  # template content to copy — see docs/ARCHITECTURE.md section 12).
  [ -f "$PODMAN_AUTOSTART_FILE" ] || { touch "$PODMAN_AUTOSTART_FILE"; podman_log "config: created empty $PODMAN_AUTOSTART_FILE"; }
  [ -f "$PODMAN_AUTOSTART_DELAY_FILE" ] || { touch "$PODMAN_AUTOSTART_DELAY_FILE"; podman_log "config: created empty $PODMAN_AUTOSTART_DELAY_FILE"; }
  [ -f "$PODMAN_PLUGIN_LOG" ] || touch "$PODMAN_PLUGIN_LOG"

  podman_log "config: seeding complete"
}

cmd_sync() {
  podman_load_cfg

  if [ ! -d "$PODMAN_BOOT_DIR" ]; then
    podman_log_error "config: $PODMAN_BOOT_DIR does not exist — run 'podman-config.sh seed' first"
    return 1
  fi

  podman_log "config: syncing $PODMAN_BOOT_DIR/*.conf -> $PODMAN_ETC_DIR/"
  mkdir -p "$PODMAN_ETC_DIR"

  local any_missing=0
  for f in containers.conf storage.conf registries.conf policy.json; do
    if [ ! -f "$PODMAN_BOOT_DIR/$f" ]; then
      podman_log_error "config: missing $PODMAN_BOOT_DIR/$f (run 'podman-config.sh seed')"
      any_missing=1
      continue
    fi
    cp "$PODMAN_BOOT_DIR/$f" "$PODMAN_ETC_DIR/$f"
  done

  if [ "$any_missing" -ne 0 ]; then
    return 1
  fi

  # storage.conf's graphroot/runroot are environment-specific (depend on
  # STORAGE_PATH from podman.cfg), so they are appended here at sync time
  # rather than hardcoded in the template — see config/storage.conf's own
  # comment on this split.
  {
    echo ""
    echo "# --- appended at boot by podman-config.sh sync, from podman.cfg ---"
    echo "[storage]"
    echo "driver = \"overlay\""
    echo "graphroot = \"$PODMAN_GRAPHROOT\""
    echo "runroot = \"/var/run/containers/storage\""
  } >> "$PODMAN_ETC_DIR/storage.conf"

  podman_log "config: sync complete"
}

case "${1:-}" in
  seed) cmd_seed ;;
  sync) cmd_sync ;;
  *)
    echo "usage: $0 {seed|sync}" >&2
    exit 1
    ;;
esac