#!/usr/bin/env bash
# Interactive manifest builder for the Project Loading scene.
#
#   ./loading.sh
#
# Walks you through 5 prompts, writes loading.json + loading.js, then
# refresh the Project Loading browser source in OBS.  Re-running uses
# previous answers as defaults — press Enter to keep them.
set -euo pipefail

DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
JSON="$DIR/loading.json"
JS="$DIR/loading.js"

# Reads a top-level field from the previous loading.json. Always exits 0;
# prints empty string if file/field is missing.
prev() {
  [[ -f "$JSON" ]] || return 0
  python3 - "$JSON" "$1" <<'PY' 2>/dev/null || true
import json, sys
try:
    d = json.load(open(sys.argv[1]))
    v = d.get(sys.argv[2])
    if v is None:                print('')
    elif isinstance(v, bool):    print('y' if v else 'n')
    else:                        print(v)
except Exception:
    pass
PY
}

ask() {
  # ask "question" "default" → echoes user input or default if blank
  local q="$1" def="${2:-}"
  local prompt="  $q"
  [[ -n "$def" ]] && prompt+="  [$def]"
  prompt+=": "
  local v
  read -rp "$prompt" v
  [[ -z "$v" && -n "$def" ]] && v="$def"
  printf '%s' "$v"
}

ask_yn() {
  local v; v=$(ask "$1" "${2:-y}")
  case "${v,,}" in
    y|yes|on|true|1)  printf 'true'  ;;
    n|no|off|false|0) printf 'false' ;;
    *)                printf 'true'  ;;
  esac
}

ask_int() {
  local v
  while :; do
    v=$(ask "$1" "${2:-}")
    [[ "$v" =~ ^[0-9]+$ ]] && { printf '%s' "$v"; return; }
    echo "  ✗ must be a whole number" >&2
  done
}

sanitize() {
  printf '%s' "${1:-}" \
    | tr -d '"\\' \
    | tr '\n\r\t' '   ' \
    | sed 's/  */ /g; s/^ //; s/ $//'
}
emit_str() { [[ -z "${1:-}" ]] && printf 'null' || printf '"%s"' "$1"; }

# ── Pull previous answers as defaults ───────────────
prev_game=$(prev game)
prev_subtitle=$(prev subtitle)
prev_count=$(prev countdownMin); [[ -z "$prev_count"  ]] && prev_count="5"
prev_camera=$(prev camera);      [[ -z "$prev_camera" ]] && prev_camera="y"
prev_mic=$(prev microphone);     [[ -z "$prev_mic"    ]] && prev_mic="y"

echo "── Project Loading manifest ──"
echo "  (press Enter to keep [defaults])"
echo

game=$(ask "Game" "$prev_game")
while [[ -z "$game" ]]; do
  echo "  ✗ Game is required" >&2
  game=$(ask "Game" "")
done

subtitle=$(ask    "Subtitle (mode / episode / note)" "$prev_subtitle")
countdown=$(ask_int "Countdown (minutes)"            "$prev_count")
camera=$(ask_yn   "Camera"                           "$prev_camera")
mic=$(ask_yn      "Microphone"                       "$prev_mic")

game=$(sanitize "$game")
subtitle=$(sanitize "$subtitle")

now_iso=$(date -u +%FT%TZ)
tmp="$JSON.tmp.$$"
cat > "$tmp" <<JSON
{
  "compiledAt":   "$now_iso",
  "game":         $(emit_str "$game"),
  "subtitle":     $(emit_str "$subtitle"),
  "countdownMin": $countdown,
  "camera":       $camera,
  "microphone":   $mic
}
JSON

if ! python3 -m json.tool "$tmp" >/dev/null 2>&1; then
  echo "  ✗ produced invalid JSON, leaving $tmp for inspection" >&2
  exit 1
fi
mv -f "$tmp" "$JSON"
{ printf 'window.__LOADING = '; cat "$JSON"; printf ';\n'; } > "$JS.tmp.$$"
mv -f "$JS.tmp.$$" "$JS"

echo
echo "  ✓ wrote $JSON"
echo "  ✓ wrote $JS"
echo "  → refresh the Project Loading browser source in OBS."