#!/usr/bin/env bash
# stream.sh — interactive pre-stream helper.
#
#   ./stream.sh
#
# Prompts for game + title + countdown, resolves the game to a Twitch
# category id via ../search-game.py, updates the channel via ../set-channel.py,
# and writes stream.json next to this script for any overlay / starting-soon
# timer / status page that wants to read the manifest.
#
# Re-running uses your previous answers as defaults — press Enter to keep them.
#
# Output path can be overridden with STREAM_JSON=/path/to/file.json ./stream.sh
set -euo pipefail

DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
BOT_DIR="$(cd "$DIR/.." && pwd)"
JSON="${STREAM_JSON:-$DIR/stream.json}"

SEARCH_GAME="$BOT_DIR/search-game.py"
SET_CHANNEL="$BOT_DIR/set-channel.py"

# Reads a top-level field from the previous stream.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])
    print('' if v is None else 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_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=$(prev game)
prev_game_id=$(prev gameId)
prev_title=$(prev title)
prev_count=$(prev countdownMin); [[ -z "$prev_count" ]] && prev_count="5"

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

# Resolve Game via Twitch search → exact directory entry. The picker prints
# "<id>\t<name>" to stdout on success, or non-zero on no-match / cancel.
# Re-running and accepting the previous game unchanged reuses the cached id
# so we don't burn an API call to re-resolve a known answer.
have_twitch=0
[[ -x "$SEARCH_GAME" ]] && have_twitch=1

game=""; game_id=""
while :; do
  query=$(ask "Game (search)" "$prev_game")
  if [[ -z "$query" ]]; then
    echo "  ✗ Game is required" >&2
    continue
  fi
  if (( have_twitch )); then
    # Reuse cached id only if it looks like a real Twitch numeric id. A past
    # bug (search-game.py prompt leaking into stdout) wrote "Pick: 506462"
    # here; the regex makes sure such corruption falls back to a fresh search
    # instead of getting passed straight to PATCH /helix/channels.
    if [[ -n "$prev_game_id" && "$query" == "$prev_game" && "$prev_game_id" =~ ^[0-9]+$ ]]; then
      game="$prev_game"; game_id="$prev_game_id"
      echo "  ↻ reusing cached: $game (id=$game_id)"
      break
    fi
    if line=$("$SEARCH_GAME" "$query"); then
      IFS=$'\t' read -r game_id game <<<"$line"
      break
    fi
    # search-game.py already printed its own error; loop and re-ask
  else
    # no twitch helper available — accept the raw input, no id resolution
    game="$query"; game_id=""
    break
  fi
done

title=$(ask     "Title (Twitch stream title)" "$prev_title")
countdown=$(ask_int "Countdown (minutes)"     "$prev_count")

game=$(sanitize "$game")
title=$(sanitize "$title")

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

echo
echo "  ✓ wrote $JSON"

# ── Push to Twitch (game + title) via the broadcaster token ─────────────
# Soft-fail: a Twitch hiccup must not block the local manifest from being
# written — anything reading stream.json can still load offline.
# Title falls back to the game name when the user left it blank.
if (( have_twitch )) && [[ -x "$SET_CHANNEL" && -n "$game_id" ]]; then
  twitch_title="${title:-$game}"
  echo
  if ! "$SET_CHANNEL" --game-id "$game_id" "$twitch_title"; then
    echo "  ! Twitch sync failed (manifest still saved) — fix and re-run if needed" >&2
  fi
fi