#!/usr/bin/env bash
# One-command local CASAN Control Plane for demos and offline evaluation.
# Platform-only: Core stays a non-blocking sensor/enforcer and local spool.
set -uo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
SOURCE_ROOT="$(cd "$SCRIPT_DIR/../../.." && pwd)"
COMMAND="${1:-start}"
[[ $# -gt 0 ]] && shift || true

TARGET="${CASAN_APP_ROOT:-$PWD}"
OPEN_BROWSER=1
while [[ $# -gt 0 ]]; do
  case "$1" in
    --root) TARGET="${2:-}"; shift 2 ;;
    --no-open) OPEN_BROWSER=0; shift ;;
    *) echo "casan dashboard: unknown argument: $1" >&2; exit 64 ;;
  esac
done

TARGET="$(cd "$TARGET" 2>/dev/null && pwd)" || {
  echo "casan dashboard: project root does not exist: $TARGET" >&2
  exit 66
}
[[ -f "$TARGET/.casan/config.json" ]] || {
  echo "casan dashboard: $TARGET is not an adopted CASAN project" >&2
  exit 65
}
[[ -f "$SOURCE_ROOT/package.json" ]] || {
  echo "casan dashboard: Platform source bundle is incomplete" >&2
  exit 1
}

STATE_DIR="${CASAN_CONTROL_PLANE_STATE_DIR:-$TARGET/.specify/state/control-plane}"
mkdir -p "$STATE_DIR"
API_PID_FILE="$STATE_DIR/api.pid"
UI_PID_FILE="$STATE_DIR/ui.pid"
API_LOG="$STATE_DIR/api.log"
UI_LOG="$STATE_DIR/ui.log"
DASHBOARD_URL="${CASAN_DASHBOARD_URL:-http://127.0.0.1:5174}"

alive() {
  local file="$1" pid
  [[ -f "$file" ]] || return 1
  pid="$(sed -n '1p' "$file" 2>/dev/null || true)"
  [[ "$pid" =~ ^[0-9]+$ ]] && kill -0 "$pid" 2>/dev/null
}

enroll() {
  python3 - "$TARGET/.casan/config.json" "$DASHBOARD_URL" <<'PY'
import json
import os
import sys
import tempfile

path, url = sys.argv[1:3]
with open(path, "r", encoding="utf-8") as handle:
    config = json.load(handle)
control_plane = config.get("control_plane")
if not isinstance(control_plane, dict):
    control_plane = {}
control_plane.update({
    "dashboard_url": url.rstrip("/"),
    "delivery": "local_spool",
    "receipt_links_enabled": True,
})
config["control_plane"] = control_plane
directory = os.path.dirname(path)
fd, temporary = tempfile.mkstemp(prefix=".config.", suffix=".tmp", dir=directory)
try:
    with os.fdopen(fd, "w", encoding="utf-8") as handle:
        json.dump(config, handle, ensure_ascii=False, indent=2)
        handle.write("\n")
        handle.flush()
        os.fsync(handle.fileno())
    os.replace(temporary, path)
finally:
    if os.path.exists(temporary):
        os.unlink(temporary)
PY
}

open_dashboard() {
  python3 - "$DASHBOARD_URL" <<'PY'
import sys
import webbrowser
raise SystemExit(0 if webbrowser.open(sys.argv[1], new=2) else 1)
PY
}

case "$COMMAND" in
  start)
    if alive "$API_PID_FILE" && alive "$UI_PID_FILE"; then
      enroll
      echo "CASAN_CONTROL_PLANE_READY url=$DASHBOARD_URL project=$TARGET"
      [[ "$OPEN_BROWSER" == "1" ]] && open_dashboard || true
      exit 0
    fi
    python3 - "$SOURCE_ROOT" "$TARGET" "$API_LOG" "$UI_LOG" "$API_PID_FILE" "$UI_PID_FILE" <<'PY'
import os
import subprocess
import sys

source, target, api_log, ui_log, api_pid, ui_pid = sys.argv[1:7]
environment = os.environ.copy()
environment["CASAN_APP_ROOT"] = target
with open(api_log, "ab", buffering=0) as api_output:
    api = subprocess.Popen(
        [os.path.join(source, "node_modules", ".bin", "tsx"), "src/main.ts"],
        cwd=os.path.join(source, "packages", "casan-control-panel", "backend"),
        env=environment,
        stdin=subprocess.DEVNULL,
        stdout=api_output,
        stderr=subprocess.STDOUT,
        start_new_session=True,
    )
with open(ui_log, "ab", buffering=0) as ui_output:
    ui = subprocess.Popen(
        [
            os.path.join(source, "node_modules", ".bin", "vite"),
            "--host", "127.0.0.1", "--port", "5174",
        ],
        cwd=os.path.join(source, "packages", "casan-control-panel", "frontend"),
        stdin=subprocess.DEVNULL,
        stdout=ui_output,
        stderr=subprocess.STDOUT,
        start_new_session=True,
    )
for path, pid in ((api_pid, api.pid), (ui_pid, ui.pid)):
    with open(path, "w", encoding="utf-8") as handle:
        handle.write("%s\n" % pid)
PY
    ready=0
    for _attempt in $(seq 1 60); do
      if curl -fsS "http://127.0.0.1:3010/api/v1/project" >/dev/null 2>&1 \
        && curl -fsS "$DASHBOARD_URL" >/dev/null 2>&1; then
        ready=1
        break
      fi
      sleep 0.25
    done
    if [[ "$ready" != "1" ]]; then
      echo "casan dashboard: Control Plane did not become ready" >&2
      echo "API log: $API_LOG" >&2
      echo "UI log: $UI_LOG" >&2
      exit 1
    fi
    enroll
    echo "CASAN_CONTROL_PLANE_READY url=$DASHBOARD_URL project=$TARGET"
    echo "logs=$STATE_DIR"
    [[ "$OPEN_BROWSER" == "1" ]] && open_dashboard || true
    ;;
  status)
    api="stopped"; ui="stopped"
    alive "$API_PID_FILE" && api="running"
    alive "$UI_PID_FILE" && ui="running"
    echo "CASAN_CONTROL_PLANE_STATUS api=$api ui=$ui url=$DASHBOARD_URL project=$TARGET"
    [[ "$api" == "running" && "$ui" == "running" ]]
    ;;
  stop)
    for file in "$API_PID_FILE" "$UI_PID_FILE"; do
      if alive "$file"; then
        pid="$(sed -n '1p' "$file")"
        kill "$pid"
      fi
      rm -f "$file"
    done
    echo "CASAN_CONTROL_PLANE_STOPPED project=$TARGET"
    ;;
  open)
    enroll
    echo "$DASHBOARD_URL"
    open_dashboard
    ;;
  *)
    echo "casan: usage: casan dashboard <start|status|stop|open> [--root path] [--no-open]" >&2
    exit 64
    ;;
esac