#!/usr/bin/env bash
# =============================================================================
#  run_once_10-add-gentoo-overlays.sh.tmpl  (gentoo-only)
#  Add the GURU overlay to the portage repository list. GURU is the
#  community overlay (like AUR for arch) where packages like bun, eza,
#  sway, etc. live when they're not in the main tree.
#
#  Idempotent: skips if GURU is already enabled.
#  Guarded: this script is a no-op on non-gentoo boxes via the os_family
#  template conditional below — so topgrade/chezmoi apply never errors
#  on arch/debian where /var/db/repos/gentoo doesn't exist.
#
#  Run-order: 00 (bootstrap) → 05 (hosts) → 10 (overlays, here)
#  → 20 (packages) → 40 (sway)
# =============================================================================
set -euo pipefail

log() { printf '\033[1;34m[overlays]\033[0m %s\n' "$*"; }
die() { printf '\033[1;31m[overlays ERROR]\033[0m %s\n' "$*" >&2; exit 1; }

{{ if eq .os_family "gentoo" -}}
# --- gentoo: ensure GURU overlay is enabled ---
if [[ ! -d /var/db/repos/gentoo ]]; then
    die "/var/db/repos/gentoo missing — this doesn't look like a gentoo system"
fi

# GURU overlay — required for eza, lazygit, topgrade, etc.
if [[ -d /var/db/repos/guru ]]; then
    log "GURU overlay already enabled at /var/db/repos/guru — skipping"
else
    log "enabling GURU overlay via eselect repository"
    # `eselect repository` needs the overlays.xml index. If the cached
    # one is corrupt (lxml.etree.XMLSyntaxError), delete it and re-fetch.
    ESEL_REPO_CACHE="${HOME}/.cache/eselect-repo/repositories.xml"
    if [[ -f "$ESEL_REPO_CACHE" ]]; then
        # Quick sanity check: try to parse the XML. If invalid, delete.
        if ! python3 -c "import xml.etree.ElementTree as ET; ET.parse('$ESEL_REPO_CACHE')" 2>/dev/null; then
            log "WARN: $ESEL_REPO_CACHE is corrupt; removing and re-fetching"
            rm -f "$ESEL_REPO_CACHE"
        fi
    fi
    if ! sudo eselect repository list 2>&1 | grep -qi guru; then
        log "fetching overlays.xml index"
        sudo emaint sync --auto
    fi
    sudo eselect repository enable guru
    # Sync just the new repo so we don't re-pull the entire gentoo tree
    log "syncing GURU overlay"
    sudo emaint sync -r guru
    log "GURU overlay enabled and synced"
fi

# --- verify ---
log "enabled overlays:"
eselect repository list 2>&1 | sed 's/^/  /'

# Verify the GURU repo is readable
if [[ ! -f /var/db/repos/guru/profiles/repo_name ]]; then
    die "/var/db/repos/guru/profiles/repo_name missing — overlay didn't sync cleanly"
fi
GURU_NAME=$(cat /var/db/repos/guru/profiles/repo_name)
log "GURU repo verified: $GURU_NAME"

log "overlays ready"
{{ else -}}
# Not a gentoo box — nothing to do (guarded by os_family above).
log "skipping gentoo overlays (os_family={{ .os_family }}, not gentoo)"
{{ end -}}