#!/usr/bin/env bash
# build-stack.sh — orchestrate the Ulicraft stack: offline prep then bring-up.
#
# Phases:
#   preflight   always — verify .env + required tools
#   --prep      ONLINE  — render configs, build landing, mirror mods + air-gap,
#                         fetch launcher, pre-bake the server volume
#   --up        OFFLINE — docker compose up -d the full stack
#   (no flag)   preflight + print what each phase would do, then exit
#
# Cautious by design: halts on the first missing var, missing tool, or failed
# step. Each sub-script is itself responsible for its own integrity checks.
set -euo pipefail

cd "$(dirname "$0")/.."   # repo root
COMPOSE=(docker compose)

# ---- helpers ---------------------------------------------------------------
log()  { printf '\n\033[1;32m==>\033[0m %s\n' "$*"; }
warn() { printf '\033[1;33m!!\033[0m %s\n' "$*" >&2; }
die()  { printf '\033[1;31mxx\033[0m %s\n' "$*" >&2; exit 1; }

need_tool() { command -v "$1" >/dev/null 2>&1 || die "missing required tool: $1"; }
have_script() { [ -x "tooling/$1" ] || die "missing/not-executable: tooling/$1"; }

# ---- preflight -------------------------------------------------------------
preflight() {
  log "preflight"
  [ -f .env ] || die ".env not found (copy .env.example and fill it)"
  # shellcheck disable=SC1091
  set -a; . ./.env; set +a
  : "${BASE_DOMAIN:?BASE_DOMAIN unset in .env}"
  : "${HOST_LAN_IP:?HOST_LAN_IP unset in .env}"
  : "${RCON_PASSWORD:?RCON_PASSWORD unset in .env}"

  need_tool docker
  ${COMPOSE[@]} version >/dev/null 2>&1 || die "docker compose plugin not available"
  need_tool envsubst
  need_tool jq
  need_tool curl
  need_tool sha1sum
  command -v pnpm >/dev/null 2>&1 || warn "pnpm not found — landing build will be skipped if absent"

  echo "  BASE_DOMAIN=${BASE_DOMAIN}  HOST_LAN_IP=${HOST_LAN_IP}"
  echo "  preflight ok"
}

# ---- online prep -----------------------------------------------------------
prep() {
  log "PHASE prep (requires internet)"

  log "render configs"
  have_script render-config.sh
  tooling/render-config.sh

  log "build landing page → www/"
  if command -v pnpm >/dev/null 2>&1; then
    ( cd landing && pnpm install --frozen-lockfile && BASE_DOMAIN="${BASE_DOMAIN}" pnpm run build )
  else
    warn "pnpm absent — skipping landing build"
  fi

  log "mirror mod jars (offline pack)"
  have_script mirror-mods.sh
  tooling/mirror-mods.sh

  log "mirror full air-gap upstream (meta/libraries/assets/client.jar)"
  have_script mirror-airgap.sh
  tooling/mirror-airgap.sh

  log "fetch launcher releases"
  have_script fetch-launcher.sh
  tooling/fetch-launcher.sh

  log "fetch authlib-injector.jar (server JVM agent → drasl)"
  if [ -f runtime/authlib-injector.jar ]; then
    echo "  runtime/authlib-injector.jar present — skipping"
  else
    ai_url="$(curl -fsSL https://api.github.com/repos/yushijinhun/authlib-injector/releases/latest \
      | jq -r '.assets[] | select(.name|test("authlib-injector-[0-9].*\\.jar$")) | .browser_download_url' | head -1)"
    [ -n "$ai_url" ] && [ "$ai_url" != "null" ] || die "could not resolve authlib-injector release asset"
    curl -fSL --retry 3 -o runtime/authlib-injector.jar "$ai_url"
    echo "  downloaded $(basename "$ai_url")"
  fi

  log "pre-bake server volume (TYPE=NEOFORGE install, one-shot, online)"
  # Bring minecraft up once so itzg installs NeoForge + mods into the volume,
  # then stop it. The party then runs offline against the baked volume.
  "${COMPOSE[@]}" up -d minecraft
  warn "watch logs until 'Done' then re-run with --up; or automate a readiness probe"
}

# ---- offline bring-up ------------------------------------------------------
# Modes select which optional layers come up (override files):
#   core    base only (dnsmasq, drasl, minecraft, mc-backup, caddy auth+packwiz)
#   static  + apex landing page + launcher downloads
#   mirror  + full air-gap upstream mirror (tls internal on :443)
#   full    static + mirror (default)
up() {
  local mode="${1:-full}"
  local -a files=(-f docker-compose.yml)
  case "$mode" in
    core)   ;;
    static) files+=(-f docker-compose.static.yml) ;;
    mirror) files+=(-f docker-compose.mirror.yml) ;;
    full)   files+=(-f docker-compose.static.yml -f docker-compose.mirror.yml) ;;
    *) die "unknown up mode: '$mode' (use core|static|mirror|full)" ;;
  esac
  log "PHASE up (mode=$mode)"
  have_script render-config.sh
  tooling/render-config.sh          # cheap; ensures configs match current .env
  "${COMPOSE[@]}" "${files[@]}" up -d
  log "stack up (mode=$mode). apex: http://${BASE_DOMAIN}  auth: http://auth.${BASE_DOMAIN}"
}

# ---- dispatch --------------------------------------------------------------
preflight
case "${1:-}" in
  --prep) prep ;;
  --up)   up "${2:-full}" ;;
  "")     cat <<EOF

Nothing run. Choose a phase:
  $0 --prep            # ONLINE: render, build landing, mirror everything, pre-bake server
  $0 --up [mode]       # bring the stack up; mode = core|static|mirror|full (default full)
                       #   core   = no static site, no mirror
                       #   static = + apex landing + launcher downloads
                       #   mirror = + full air-gap upstream mirror (:443)
                       #   full   = static + mirror

Sub-scripts expected in tooling/: render-config.sh, mirror-mods.sh,
mirror-airgap.sh, fetch-launcher.sh  (built in their own commits — see plan/12).
EOF
    ;;
  *) die "unknown arg: $1 (use --prep or --up [core|static|mirror|full])" ;;
esac