#!/bin/bash
# Build a LEAN per-site artifact from a site profile (ADR-013 Phase 5).
#
# A site declares its plugins in a profile (deploy/site-profile.example.json).
# This resolves the hard-dependency closure, builds the frontend carrying only
# those plugins (via SITE_PLUGINS -> scripts/stage-frontend.mjs), and stages a
# backend tree containing core + only the chosen plugin dirs. A plugin a site
# did not choose ends up in neither the bundle nor the image.
#
# Usage: scripts/build-site.sh <site-profile.json> [output-dir]
set -euo pipefail

REPO="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
PROFILE="${1:?usage: build-site.sh <site-profile.json> [output-dir]}"
OUT="${2:-$REPO/build/site}"

[ -f "$PROFILE" ] || { echo "profile not found: $PROFILE"; exit 1; }

# Resolve the chosen plugins + their hard-dependency closure from the manifests.
CLOSURE=$(python3 - "$PROFILE" "$REPO" <<'PY'
import json, sys, os
profile_path, repo = sys.argv[1], sys.argv[2]
chosen = json.load(open(profile_path)).get('plugins', [])
plugins_dir = os.path.join(repo, 'plugins')

def deps(name):
    mpath = os.path.join(plugins_dir, name, 'manifest.json')
    if not os.path.exists(mpath):
        sys.exit(f'profile plugin not found on disk: {name}')
    out = []
    for dep in json.load(open(mpath)).get('dependencies', []):
        # name-only (strip any PEP440 range)
        for sep in '><=!~ ':
            dep = dep.split(sep)[0]
        out.append(dep.strip())
    return out

closure, seen = [], set()
def add(name):
    if name in seen: return
    seen.add(name)
    for d in deps(name): add(d)
    closure.append(name)
for p in chosen: add(p)
print(','.join(closure))
PY
)

echo "Site profile:  $PROFILE"
echo "Plugin closure: $CLOSURE"

# Frontend: build carrying only the closure's plugins.
echo "==> Building frontend (SITE_PLUGINS=$CLOSURE) ..."
( cd "$REPO/frontend" && SITE_PLUGINS="$CLOSURE" npm run build --silent )

# Backend: stage core + only the chosen plugin dirs.
echo "==> Staging backend into $OUT ..."
rm -rf "$OUT"
mkdir -p "$OUT/plugins"
rsync -a --exclude '__pycache__' --exclude '*.pyc' "$REPO/shopdb" "$OUT/"
for name in ${CLOSURE//,/ }; do
  rsync -a --exclude '__pycache__' --exclude '*.pyc' \
    "$REPO/plugins/$name" "$OUT/plugins/"
done
cp -r "$REPO/frontend/dist" "$OUT/frontend-dist"

echo ""
echo "Lean site staged at: $OUT"
echo "  backend plugins:   $(ls "$OUT/plugins" | tr '\n' ' ')"
echo "  (a plugin not listed is absent from both the backend tree and the bundle)"