#!/usr/bin/env bash
# HIY Build Engine
# Environment variables injected by hiy-server:
#   APP_ID, APP_NAME, REPO_URL, BRANCH, PORT, ENV_FILE, SHA, BUILD_DIR
set -euo pipefail

log() { echo "[hiy] $*"; }

log "=== HostItYourself Build Engine ==="
log "App:       $APP_NAME ($APP_ID)"
log "Repo:      $REPO_URL"
log "Branch:    $BRANCH"
log "Build dir: $BUILD_DIR"

# ── 1. Clone or pull ───────────────────────────────────────────────────────────
mkdir -p "$BUILD_DIR"
cd "$BUILD_DIR"

if [ -d ".git" ]; then
    log "Updating existing clone…"
    git fetch origin "$BRANCH" --depth=50
    git checkout "$BRANCH"
    git reset --hard "origin/$BRANCH"
else
    log "Cloning repository…"
    git clone --depth=50 --branch "$BRANCH" "$REPO_URL" .
fi

ACTUAL_SHA=$(git rev-parse HEAD)
log "SHA: $ACTUAL_SHA"

# ── 2. Detect build strategy ──────────────────────────────────────────────────
IMAGE_TAG="hiy/${APP_ID}:${ACTUAL_SHA}"
CONTAINER_NAME="hiy-${APP_ID}"

if [ -f "Dockerfile" ]; then
    log "Strategy: Dockerfile"
    docker build --tag "$IMAGE_TAG" .

elif [ -f "package.json" ] || [ -f "yarn.lock" ]; then
    log "Strategy: Node.js (Cloud Native Buildpack)"
    if ! command -v pack &>/dev/null; then
        log "ERROR: 'pack' CLI not found. Install it: https://buildpacks.io/docs/tools/pack/"
        exit 1
    fi
    pack build "$IMAGE_TAG" --builder paketobuildpacks/builder-jammy-base

elif [ -f "requirements.txt" ] || [ -f "pyproject.toml" ]; then
    log "Strategy: Python (Cloud Native Buildpack)"
    if ! command -v pack &>/dev/null; then
        log "ERROR: 'pack' CLI not found. Install it: https://buildpacks.io/docs/tools/pack/"
        exit 1
    fi
    pack build "$IMAGE_TAG" --builder paketobuildpacks/builder-jammy-base

elif [ -f "go.mod" ]; then
    log "Strategy: Go (Cloud Native Buildpack)"
    if ! command -v pack &>/dev/null; then
        log "ERROR: 'pack' CLI not found. Install it: https://buildpacks.io/docs/tools/pack/"
        exit 1
    fi
    pack build "$IMAGE_TAG" --builder paketobuildpacks/builder-jammy-base

elif [ -d "static" ] || [ -d "public" ]; then
    STATIC_DIR="static"
    [ -d "public" ] && STATIC_DIR="public"
    log "Strategy: Static files (Caddy) from ./$STATIC_DIR"
    cat > Dockerfile.hiy <<EOF
FROM caddy:2-alpine
COPY $STATIC_DIR /srv
EOF
    docker build --file Dockerfile.hiy --tag "$IMAGE_TAG" .
    rm -f Dockerfile.hiy

else
    log "ERROR: Could not detect build strategy."
    log "Add a Dockerfile, package.json, requirements.txt, go.mod, or a static/ directory."
    exit 1
fi

# ── 3. Ensure Docker network ───────────────────────────────────────────────────
docker network create hiy-net 2>/dev/null || true

# ── 4. Stop & remove previous container ───────────────────────────────────────
if docker ps -a --format '{{.Names}}' | grep -q "^${CONTAINER_NAME}$"; then
    log "Stopping old container…"
    docker stop "$CONTAINER_NAME" >/dev/null 2>&1 || true
    docker rm   "$CONTAINER_NAME" >/dev/null 2>&1 || true
fi

# ── 5. Start new container ────────────────────────────────────────────────────
log "Starting container ${CONTAINER_NAME}…"
ENV_FILE_ARG=()
if [ -n "${ENV_FILE:-}" ] && [ -f "$ENV_FILE" ]; then
    ENV_FILE_ARG=(--env-file "$ENV_FILE")
else
    log "No env file found at '${ENV_FILE:-}'; starting without one."
fi
docker run --detach \
    --name "$CONTAINER_NAME" \
    --network hiy-net \
    "${ENV_FILE_ARG[@]}" \
    --expose "$PORT" \
    --label "hiy.app=${APP_ID}" \
    --label "hiy.port=${PORT}" \
    --restart unless-stopped \
    --memory="512m" \
    --cpus="0.5" \
    "$IMAGE_TAG"

# ── 6. Update Caddy via its admin API ─────────────────────────────────────────
CADDY_API="${CADDY_API_URL:-http://localhost:2019}"
DOMAIN_SUFFIX="${DOMAIN_SUFFIX:-localhost}"

if curl --silent --fail "${CADDY_API}/config/" >/dev/null 2>&1; then
    CONTAINER_IP=$(docker inspect "$CONTAINER_NAME" \
        --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}')
    UPSTREAM="${CONTAINER_IP}:${PORT}"
    log "Updating Caddy: ${APP_ID}.${DOMAIN_SUFFIX} → ${UPSTREAM}"

    ROUTE_JSON=$(cat <<EOF
{
    "match":  [{"host": ["${APP_ID}.${DOMAIN_SUFFIX}"]}],
    "handle": [{"handler": "reverse_proxy", "upstreams": [{"dial": "${UPSTREAM}"}]}]
}
EOF
)
    # Upsert the route for this app.
    ROUTES=$(curl --silent "${CADDY_API}/config/apps/http/servers/hiy/routes" 2>/dev/null || echo "[]")
    # Remove existing route for the same host, then append the new one.
    UPDATED=$(echo "$ROUTES" | python3 -c "
import sys, json
routes = json.load(sys.stdin)
new_host = '${APP_ID}.${DOMAIN_SUFFIX}'
routes = [r for r in routes if new_host not in r.get('match',[{}])[0].get('host',[])]
routes.append(json.loads(sys.argv[1]))
print(json.dumps(routes))
" "$ROUTE_JSON")

    curl --silent --fail "${CADDY_API}/config/apps/http/servers/hiy/routes" \
        --header "Content-Type: application/json" \
        --request PUT \
        --data "$UPDATED" && log "Caddy updated." \
        || log "WARNING: Caddy update failed (app is running; fix routing manually)."
else
    log "Caddy admin API not reachable; skipping route update."
    log "Container $CONTAINER_NAME is running. Expose manually if needed."
fi

# ── 7. Prune old images ───────────────────────────────────────────────────────
log "Pruning old images (keeping last 3)…"
docker images "hiy/${APP_ID}" --format "{{.ID}}\t{{.CreatedAt}}" \
    | sort --reverse --key=2 \
    | tail -n +4 \
    | awk '{print $1}' \
    | xargs --no-run-if-empty docker rmi 2>/dev/null || true

log "=== Build complete: $APP_NAME @ $ACTUAL_SHA ==="