#!/usr/bin/env bash

# Steam game compatibility checker for Linux
#
# Features:
# - Gets your games either via Steam Web API (owned library) or by scanning installed appmanifests.
# - Fetches system requirements from Steam Store API (no key required).
# - Compares against your system (CPU, RAM, GPU vendor, OS/arch) with simple heuristics.
# - Ranks games from most to least likely to run.
#
# Optional env vars (for full library):
#   STEAM_API_KEY  - Your Steam Web API key
#   STEAM_ID64     - Your 64-bit Steam ID
#
# Dependencies: curl, jq, awk, sed, grep, sort, lspci, free, uname
# Recommended:   timeout (coreutils) to guard slow network calls

set -euo pipefail

SCRIPT_NAME=${0##*/}
ABORT=0
on_abort() {
  ABORT=1
  log "Aborted by user"
  exit 130
}
trap on_abort INT TERM

# --------------------------- CLI args ---------------------------

usage() {
  cat << USAGE
Usage: $SCRIPT_NAME [--refresh] [--clear-cache] [--verbose] [--help]

Options:
  --refresh       Re-analyze all games and overwrite cache (ignore previous results).
	--clear-cache   Delete cached results before running (implies --refresh).
	-v, --verbose   Print detailed progress and HTTP/parse steps.
  -h, --help      Show this help message and exit.
USAGE
}

FORCE_REFRESH=0
CLEAR_CACHE=0
VERBOSE=0

parse_args() {
  while [[ $# -gt 0 ]]; do
    case "$1" in
      --refresh)
        FORCE_REFRESH=1
        shift
        ;;
      --clear-cache)
        CLEAR_CACHE=1
        FORCE_REFRESH=1
        shift
        ;;
      -v | --verbose)
        VERBOSE=1
        shift
        ;;
      -h | --help)
        usage
        exit 0
        ;;
      *)
        die "Unknown option: $1 (use --help)"
        ;;
    esac
  done
}

log() { printf "[%s] %s\n" "$SCRIPT_NAME" "$*" >&2; }
die() {
  printf "[%s] ERROR: %s\n" "$SCRIPT_NAME" "$*" >&2
  exit 1
}
vlog() { if [[ $VERBOSE -eq 1 ]]; then printf "[%s][verbose] %s\n" "$SCRIPT_NAME" "$*" >&2; fi; }

require_cmd() {
  command -v "$1" > /dev/null 2>&1 || die "Missing dependency: $1"
}

for cmd in curl jq awk sed grep sort lspci free uname; do
  require_cmd "$cmd"
done

HAS_TIMEOUT=0
if command -v timeout > /dev/null 2>&1; then
  HAS_TIMEOUT=1
fi

# Safe HTTP GET with optional timeout if available
http_get() {
  local url="$1"
  shift || true
  local ua="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124 Safari/537.36"
  if [[ $HAS_TIMEOUT -eq 1 ]]; then
    timeout 12s curl -sSL --compressed --retry 2 --retry-delay 0.5 --retry-connrefused \
      -H "User-Agent: $ua" -H 'Accept: application/json, text/plain, */*' "$url" "$@" 2> /dev/null
  else
    curl -sSL --compressed --retry 2 --retry-delay 0.5 --retry-connrefused \
      -H "User-Agent: $ua" -H 'Accept: application/json, text/plain, */*' "$url" "$@" 2> /dev/null
  fi
}

# --------------------------- System detection ---------------------------

SYSTEM_CPU_MODEL=""
SYSTEM_CPU_CLASS="unknown"
SYSTEM_GPU_VENDOR="unknown"
SYSTEM_RAM_GB=0
SYSTEM_ARCH="$(uname -m || echo unknown)"

to_int() { awk '{gsub(/[^0-9]/,""); if($0=="") print 0; else print $0}' <<< "$1"; }

detect_system() {
  # CPU model
  if command -v lscpu > /dev/null 2>&1; then
    SYSTEM_CPU_MODEL=$(lscpu | awk -F': *' '/Model name/ {print $2; exit}')
  fi
  if [[ -z $SYSTEM_CPU_MODEL && -r /proc/cpuinfo ]]; then
    SYSTEM_CPU_MODEL=$(awk -F': *' '/model name/ {print $2; exit}' /proc/cpuinfo)
  fi
  SYSTEM_CPU_MODEL=${SYSTEM_CPU_MODEL:-unknown}

  # CPU class (very rough)
  lc_model=$(tr '[:upper:]' '[:lower:]' <<< "$SYSTEM_CPU_MODEL")
  if grep -qiE 'i9-|core\(tm\) i9| ryzen 9' <<< "$lc_model"; then
    SYSTEM_CPU_CLASS="tier4"
  elif grep -qiE 'i7-|core\(tm\) i7| ryzen 7' <<< "$lc_model"; then
    SYSTEM_CPU_CLASS="tier3"
  elif grep -qiE 'i5-|core\(tm\) i5| ryzen 5' <<< "$lc_model"; then
    SYSTEM_CPU_CLASS="tier2"
  elif grep -qiE 'i3-|core\(tm\) i3| ryzen 3| pentium|celeron|atom' <<< "$lc_model"; then
    SYSTEM_CPU_CLASS="tier1"
  else SYSTEM_CPU_CLASS="tier2"; fi

  # GPU vendor
  local vga
  vga=$(lspci 2> /dev/null | grep -iE 'vga|3d|display' | head -n1 || true)
  lc_vga=$(tr '[:upper:]' '[:lower:]' <<< "$vga")
  if grep -q 'nvidia' <<< "$lc_vga"; then
    SYSTEM_GPU_VENDOR="nvidia"
  elif grep -q -E 'amd|ati|radeon' <<< "$lc_vga"; then
    SYSTEM_GPU_VENDOR="amd"
  elif grep -q 'intel' <<< "$lc_vga"; then
    SYSTEM_GPU_VENDOR="intel"
  else SYSTEM_GPU_VENDOR="unknown"; fi

  # RAM GB
  local mem_kb
  mem_kb=$(awk '/MemTotal/ {print $2; exit}' /proc/meminfo 2> /dev/null || echo 0)
  if [[ $mem_kb -gt 0 ]]; then
    SYSTEM_RAM_GB=$(((mem_kb + 1023 * 1024) / (1024 * 1024)))
  else
    local mem_mb
    mem_mb=$(free -m | awk '/Mem:/ {print $2; exit}')
    SYSTEM_RAM_GB=$(((mem_mb + 1023) / 1024))
  fi
}

cpu_class_rank() {
  case "$1" in
    tier1) echo 1 ;;
    tier2) echo 2 ;;
    tier3) echo 3 ;;
    tier4) echo 4 ;;
    *) echo 2 ;;
  esac
}

required_cpu_rank_from_text() {
  local t
  t=$(tr '[:upper:]' '[:lower:]' <<< "$1")
  if grep -qE 'i9|ryzen 9' <<< "$t"; then
    echo 4
    return
  fi
  if grep -qE 'i7|ryzen 7' <<< "$t"; then
    echo 3
    return
  fi
  if grep -qE 'i5|ryzen 5' <<< "$t"; then
    echo 2
    return
  fi
  if grep -qE 'i3|ryzen 3|pentium|celeron|atom' <<< "$t"; then
    echo 1
    return
  fi
  echo 2
}

gpu_vendor_required_from_text() {
  local t
  t=$(tr '[:upper:]' '[:lower:]' <<< "$1")
  if grep -qE 'nvidia|geforce|gtx|rtx' <<< "$t"; then
    echo nvidia
    return
  fi
  if grep -qE 'amd|radeon|rx[ -]?[0-9]' <<< "$t"; then
    echo amd
    return
  fi
  if grep -qE 'intel( graphics| arc| iris| hd)' <<< "$t"; then
    echo intel
    return
  fi
  echo unknown
}

strip_html() {
  sed -E 's/<[^>]+>//g; s/&nbsp;/ /g; s/&amp;/\&/g; s/\r//g' <<< "$1"
}

parse_ram_gb() {
  # Extract first RAM mention and convert to GB integer
  local text="$1"
  local num val
  # Prefer GB
  num=$(grep -oiE '([0-9]+)\s*(gb|gib)' <<< "$text" | head -n1 | grep -oiE '^[0-9]+' || true)
  if [[ -n $num ]]; then
    echo "$num"
    return
  fi
  # Try MB
  num=$(grep -oiE '([0-9]+)\s*(mb|mib)' <<< "$text" | head -n1 | grep -oiE '^[0-9]+' || true)
  if [[ -n $num ]]; then
    val=$(((num + 1023) / 1024))
    echo "$val"
    return
  fi
  echo 0
}

# --------------------------- Steam data ---------------------------

CONFIG_DIR="${XDG_CONFIG_HOME:-$HOME/.config}/steam-compat-check"
CONFIG_FILE="$CONFIG_DIR/credentials.conf"

# Cache for analyzed results
CACHE_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/steam-compat-check"
RESULTS_CACHE="$CACHE_DIR/results.tsv"

load_credentials() {
  # Prefer environment, else config file
  if [[ -n ${STEAM_API_KEY:-} && -n ${STEAM_ID64:-} ]]; then
    return 0
  fi
  if [[ -r $CONFIG_FILE ]]; then
    # shellcheck disable=SC1090
    . "$CONFIG_FILE" || true
  fi
  if [[ -z ${STEAM_API_KEY:-} || -z ${STEAM_ID64:-} ]]; then
    return 1
  fi
  return 0
}

save_credentials() {
  local key="$1" id="$2"
  mkdir -p "$CONFIG_DIR"
  chmod 700 "$CONFIG_DIR" 2> /dev/null || true
  umask 177
  cat > "$CONFIG_FILE" << EOF
# Saved by $SCRIPT_NAME
STEAM_API_KEY="$key"
STEAM_ID64="$id"
EOF
}

prompt_for_credentials() {
  if [[ ! -t 0 ]]; then
    die "STEAM_API_KEY/STEAM_ID64 not set and input is non-interactive. Export them or create $CONFIG_FILE."
  fi
  echo "Steam Web API credentials are required to scan your full library."
  echo
  echo "Where to get them:"
  echo "- Steam Web API Key: https://steamcommunity.com/dev/apikey"
  echo "  Log in, set any domain (e.g., 127.0.0.1), then copy the key."
  echo "- SteamID64 (17-digit ID starting with 765):"
  echo "  * Easiest: https://steamid.io/ (paste your profile URL to get the 64-bit ID)"
  echo "  * Or enable URL bar in Steam (Settings > Interface), open your profile; the URL contains the ID."
  echo
  local key id
  read -r -p "Enter Steam Web API Key: " key
  read -r -p "Enter Steam 64-bit ID (begins with 765…): " id
  if [[ -z $key || -z $id ]]; then
    die "Credentials not provided. Exiting."
  fi
  # Light validation for ID64
  if ! grep -qE '^765[0-9]{14}$' <<< "$id"; then
    log "Warning: Steam ID64 format unexpected; continuing anyway."
  fi
  STEAM_API_KEY="$key"
  STEAM_ID64="$id"
  export STEAM_API_KEY STEAM_ID64
  save_credentials "$STEAM_API_KEY" "$STEAM_ID64"
  log "Saved credentials to $CONFIG_FILE"
}

STEAM_DIRS=("$HOME/.steam/steam" "$HOME/.local/share/Steam")

find_steamapps_dirs() {
  local dirs=()
  for base in "${STEAM_DIRS[@]}"; do
    [[ -d $base ]] || continue
    if [[ -f "$base/steamapps/libraryfolders.vdf" ]]; then
      # Newer format includes nested objects with paths
      local paths
      paths=$(grep -oE '"path"\s+"[^"]+"' "$base/steamapps/libraryfolders.vdf" | sed -E 's/.*"([^"]+)"/\1/' || true)
      if [[ -n $paths ]]; then
        while IFS= read -r p; do
          [[ -d "$p/steamapps" ]] && dirs+=("$p/steamapps")
        done <<< "$paths"
      fi
    fi
    [[ -d "$base/steamapps" ]] && dirs+=("$base/steamapps")
  done
  # de-dupe
  printf "%s\n" "${dirs[@]}" 2> /dev/null | awk '!seen[$0]++'
}

list_installed_games() {
  local d appid name
  while IFS= read -r d; do
    [[ -d $d ]] || continue
    for mf in "$d"/appmanifest_*.acf; do
      [[ -f $mf ]] || continue
      appid=$(grep -oE '"appid"\s+"[0-9]+"' "$mf" | sed -E 's/.*"([0-9]+)"/\1/' | head -n1)
      name=$(grep -oE '"name"\s+"[^"]+"' "$mf" | sed -E 's/.*"([^"]+)"/\1/' | head -n1)
      if [[ -n $appid ]]; then
        printf "%s\t%s\n" "$appid" "${name:-Unknown}"
      fi
    done
  done < <(find_steamapps_dirs)
}

list_owned_games_via_api() {
  local key="${STEAM_API_KEY:-}" sid="${STEAM_ID64:-}"
  if [[ -z $key || -z $sid ]]; then
    return 1
  fi
  local url="https://api.steampowered.com/IPlayerService/GetOwnedGames/v0001/?key=${key}&steamid=${sid}&include_appinfo=1&include_played_free_games=1&format=json"
  http_get "$url" | jq -r '.response.games[]? | "\(.appid)\t\(.name)"' || return 1
}

fetch_appdetails_json() {
  local appid="$1"
  # Using store API (no key)
  local url="https://store.steampowered.com/api/appdetails?appids=${appid}&l=en&cc=us"
  http_get "$url" || true
}

extract_requirements_and_platforms() {
  # Input: JSON from appdetails; Output: TSV of fields
  # Fields: success, linux, windows, mac, min_text, rec_text, type
  local appid="$1" json="$2"
  # Some apps return {"APPID": {"success":true, "data":{...}}}
  local out
  out=$(jq -r --arg APP "$appid" '
		.[$APP] as $root | if ($root.success==true and ($root.data|type)=="object") then
			($root.data.platforms.linux // false) as $linux |
			($root.data.platforms.windows // false) as $windows |
			($root.data.platforms.mac // false) as $mac |
			($root.data.type // "") as $type |
			# Prefer Linux reqs when present
			($root.data.linux_requirements.minimum // $root.data.pc_requirements.minimum // "") as $min |
			($root.data.linux_requirements.recommended // $root.data.pc_requirements.recommended // "") as $rec |
			["ok", ($linux|tostring), ($windows|tostring), ($mac|tostring), ($min|tostring), ($rec|tostring), ($type|tostring)] | @tsv
		else
			["fail", "false", "false", "false", "", "", ""] | @tsv
		end' 2> /dev/null <<< "$json") || true
  if [[ -z $out ]]; then
    out=$'fail	false	false	false			'
  fi
  printf '%s\n' "$out"
}

# Read JSON from stdin (avoids storing large/binary data in variables)
extract_requirements_and_platforms_stdin() {
  local appid="$1"
  local out
  out=$(jq -r --arg APP "$appid" '
		.[$APP] as $root | if ($root.success==true and ($root.data|type)=="object") then
			($root.data.platforms.linux // false) as $linux |
			($root.data.platforms.windows // false) as $windows |
			($root.data.platforms.mac // false) as $mac |
			($root.data.type // "") as $type |
			($root.data.linux_requirements.minimum // $root.data.pc_requirements.minimum // "") as $min |
			($root.data.linux_requirements.recommended // $root.data.pc_requirements.recommended // "") as $rec |
			["ok", ($linux|tostring), ($windows|tostring), ($mac|tostring), ($min|tostring), ($rec|tostring), ($type|tostring)] | @tsv
		else
			["fail", "false", "false", "false", "", "", ""] | @tsv
		end' 2> /dev/null) || true
  if [[ -z $out ]]; then
    out=$'fail\tfalse\tfalse\tfalse\t\t\t'
  fi
  printf '%s\n' "$out"
}

score_game() {
  local linux_support="$1" min_txt="$2" rec_txt="$3"
  local score=0

  # Linux platform support
  if [[ $linux_support == "true" ]]; then
    score=$((score + 50))
  else
    score=$((score + 20)) # Assume Proton potential
  fi

  local min_plain rec_plain
  min_plain=$(strip_html "$min_txt")
  rec_plain=$(strip_html "$rec_txt")

  local min_ram rec_ram
  min_ram=$(parse_ram_gb "$min_plain")
  rec_ram=$(parse_ram_gb "$rec_plain")

  # RAM checks
  if [[ $min_ram -gt 0 ]]; then
    if [[ $SYSTEM_RAM_GB -ge $min_ram ]]; then score=$((score + 15)); else score=$((score - 30)); fi
  fi
  if [[ $rec_ram -gt 0 ]]; then
    if [[ $SYSTEM_RAM_GB -ge $rec_ram ]]; then score=$((score + 10)); else score=$((score - 10)); fi
  fi

  # CPU checks (very rough tiers)
  local req_rank sys_rank
  req_rank=$(required_cpu_rank_from_text "$min_plain $rec_plain")
  sys_rank=$(cpu_class_rank "$SYSTEM_CPU_CLASS")
  if [[ $sys_rank -ge $req_rank ]]; then score=$((score + 10)); else score=$((score - 10)); fi

  # GPU vendor hints
  local req_gpu vendor
  req_gpu=$(gpu_vendor_required_from_text "$min_plain $rec_plain")
  vendor="$SYSTEM_GPU_VENDOR"
  if [[ $req_gpu == "unknown" ]]; then
    score=$((score + 5))
  elif [[ $req_gpu == "$vendor" ]]; then
    score=$((score + 10))
  else
    score=$((score - 10))
  fi

  # 64-bit OS requirement
  if grep -qi '64-?bit' <<< "$min_plain $rec_plain"; then
    if [[ $SYSTEM_ARCH == "x86_64" || $SYSTEM_ARCH == "aarch64" ]]; then
      score=$((score + 5))
    else
      score=$((score - 20))
    fi
  fi

  printf "%s\t%s\t%s\n" "$score" "$min_ram" "$rec_ram"
}

print_header() {
  printf "%-5s  %-8s  %-6s  %-6s  %-8s  %-9s  %s\n" "Rank" "Score" "MinRAM" "RecRAM" "Linux" "ProtonDB" "Title"
}

check_network_or_exit() {
  # Quick probe to Steam Store API; exit early if not reachable
  local probe_url="https://store.steampowered.com/api/appdetails?appids=10&l=en&cc=us"
  if ! http_get "$probe_url" | jq -e '."10".success == true' > /dev/null 2>&1; then
    log "Warning: store.steampowered.com probe failed (network or rate-limit). Continuing and handling per-app."
  fi
}

is_known_tool_name() {
  local name_lc
  name_lc=$(tr '[:upper:]' '[:lower:]' <<< "$1")
  if grep -qE 'steam linux runtime|proton|compatibility tool' <<< "$name_lc"; then
    return 0
  fi
  return 1
}

ensure_cache_dir() {
  mkdir -p "$CACHE_DIR" 2> /dev/null || true
}

declare -A CACHE_MAP
load_cache_map() {
  CACHE_MAP=()
  if [[ -r $RESULTS_CACHE ]]; then
    while IFS= read -r raw_line; do
      # Normalize historical caches that contain literal "\t" instead of real tabs
      local norm_line
      norm_line=$(printf "%s" "$raw_line" | sed -E $'s/\\t/\t/g; s/\r$//')
      IFS=$'\t' read -r c_score c_appid c_linux c_min c_rec c_name c_pdb <<< "$norm_line"
      [[ -z ${c_appid:-} ]] && continue
      c_pdb=${c_pdb:-unknown}
      CACHE_MAP["$c_appid"]="$c_score\t$c_appid\t$c_linux\t$c_min\t$c_rec\t$c_name\t$c_pdb"
    done < "$RESULTS_CACHE"
  fi
}

# --------------------------- ProtonDB integration ---------------------------

fetch_protondb_tier() {
  local appid="$1"
  local url="https://www.protondb.com/api/v1/reports/summaries/${appid}.json"
  # Returns minimal JSON including .tier, .confidence; we only need .tier
  local tier
  tier=$(http_get "$url" | jq -r 'try .tier // "unknown"' 2> /dev/null || true)
  if [[ -z $tier || $tier == "null" ]]; then
    echo "unknown"
  else
    tr '[:upper:]' '[:lower:]' <<< "$tier" | tr -d '\r\n'
  fi
}

protondb_allowed() {
  local tier
  tier=$(tr '[:upper:]' '[:lower:]' <<< "${1:-}")
  case "$tier" in
    platinum | native | gold | silver | unknown | "") return 0 ;;
    bronze | pending | borked | unsupported | broken) return 1 ;;
    *) return 0 ;;
  esac
}

main() {
  parse_args "$@"
  detect_system
  log "System: CPU=[$SYSTEM_CPU_MODEL] class=$SYSTEM_CPU_CLASS | GPU=$SYSTEM_GPU_VENDOR | RAM=${SYSTEM_RAM_GB}GB | Arch=$SYSTEM_ARCH"

  local tmpdir
  tmpdir=$(mktemp -d)
  trap '[[ -n "${tmpdir:-}" ]] && rm -rf "$tmpdir"' EXIT

  local games_tsv="$tmpdir/games.tsv"
  : > "$games_tsv"

  # Ensure credentials exist: load from env/config or prompt, else exit
  if ! load_credentials; then
    prompt_for_credentials
  fi

  # Fail fast if we cannot reach the store API to avoid noisy per-app errors
  check_network_or_exit

  if list_owned_games_via_api > "$games_tsv" 2> /dev/null; then
    log "Fetched owned games via Steam Web API"
  fi

  if [[ ! -s $games_tsv ]]; then
    die "No games found from Steam Web API. Check STEAM_API_KEY/STEAM_ID64 and network connectivity."
  fi

  # Fail fast if we cannot reach the store API to avoid noisy per-app errors
  check_network_or_exit

  ensure_cache_dir
  if [[ $CLEAR_CACHE -eq 1 ]] && [[ -f $RESULTS_CACHE ]]; then
    rm -f "$RESULTS_CACHE" || true
    log "Cleared cache: $RESULTS_CACHE"
  fi
  if [[ $FORCE_REFRESH -eq 0 ]]; then
    load_cache_map
  else
    CACHE_MAP=()
  fi

  local results_combined="$tmpdir/results.tsv"
  : > "$results_combined"

  local count=0
  local total
  total=$(wc -l < "$games_tsv" | tr -d ' ')
  [[ -z $total ]] && total=0
  while IFS=$'\t' read -r appid name; do
    [[ $ABORT -eq 1 ]] && break
    [[ -n $appid ]] || continue
    if is_known_tool_name "$name"; then
      vlog "[$((count + 1))/$total] Skipping compatibility tool: $name ($appid)"
      continue
    fi
    # If cached, reuse; else analyze and cache
    if [[ $FORCE_REFRESH -eq 0 && -n ${CACHE_MAP[$appid]+isset} ]]; then
      # Normalize to include ProtonDB column if older cache lacked it
      IFS=$'\t' read -r c_score c_a c_linux c_min c_rec c_name c_pdb <<< "${CACHE_MAP[$appid]}"
      c_pdb=${c_pdb:-unknown}
      vlog "[$((count + 1))/$total] Cache hit: $name ($appid) | ProtonDB=$c_pdb"
      printf "%s\t%s\t%s\t%s\t%s\t%s\t%s\n" "$c_score" "$c_a" "$c_linux" "$c_min" "$c_rec" "$c_name" "$c_pdb" >> "$results_combined"
      continue
    fi
    count=$((count + 1))
    log "Analyzing: $name ($appid) [$count/$total]"
    local row url
    url="https://store.steampowered.com/api/appdetails?appids=${appid}&l=en&cc=us"
    vlog "[$count/$total] Fetching store appdetails: $url"
    # Be gentle with the store API
    sleep 0.1
    row=$(http_get "$url" | extract_requirements_and_platforms_stdin "$appid" || true)
    if [[ -z $row ]]; then continue; fi
    local status linux _windows _mac min_txt rec_txt type
    IFS=$'\t' read -r status linux _windows _mac min_txt rec_txt type <<< "$row"
    vlog "[$count/$total] Parsed store data: status=$status linux=$linux type=$type"
    # Occasionally Steam returns success=false spuriously; retry once
    if [[ $status != "ok" ]]; then
      vlog "[$count/$total] Store status=fail; retrying once..."
      sleep 0.3
      row=$(http_get "$url" | extract_requirements_and_platforms_stdin "$appid" || true)
      IFS=$'\t' read -r status linux _windows _mac min_txt rec_txt type <<< "$row"
      vlog "[$count/$total] After retry: status=$status"
    fi
    # Try filtered endpoint that often bypasses age/region gates
    if [[ $status != "ok" ]]; then
      local url2="https://store.steampowered.com/api/appdetails?appids=${appid}&filters=platforms,linux_requirements,pc_requirements,type&l=en&cc=us"
      vlog "[$count/$total] Retrying with filters: $url2"
      sleep 0.1
      row=$(http_get "$url2" | extract_requirements_and_platforms_stdin "$appid" || true)
      IFS=$'\t' read -r status linux _windows _mac min_txt rec_txt type <<< "$row"
      vlog "[$count/$total] Filtered fetch status=$status"
    fi
    if [[ $status != "ok" ]]; then continue; fi
    if [[ $type != "game" && $type != "dlc" && $type != "" ]]; then continue; fi
    # ProtonDB tier
    [[ $ABORT -eq 1 ]] && break
    local pdb_tier
    vlog "[$count/$total] Fetching ProtonDB tier for appid=$appid"
    pdb_tier=$(fetch_protondb_tier "$appid")
    vlog "[$count/$total] ProtonDB tier=$pdb_tier"

    # Compute hardware-based score
    local score_line s_score s_min_ram s_rec_ram
    score_line=$(score_game "$linux" "$min_txt" "$rec_txt")
    IFS=$'\t' read -r s_score s_min_ram s_rec_ram <<< "$score_line"

    # Gate by ProtonDB: if bronze or below -> mark unplayable and force low score
    if ! protondb_allowed "$pdb_tier"; then
      s_score=-999
    fi

    printf "%s\t%s\t%s\t%s\t%s\t%s\t%s\n" "$s_score" "$appid" "$linux" "$s_min_ram" "$s_rec_ram" "$name" "$pdb_tier" >> "$results_combined"
    vlog "[$count/$total] Scored and recorded: score=$s_score min=${s_min_ram}G rec=${s_rec_ram}G"
  done < "$games_tsv"

  if [[ ! -s $results_combined ]]; then
    die "No compatible entries parsed from store API."
  fi

  print_header
  local rank=0
  sort -t $'\t' -k1,1nr -k6,6 "$results_combined" | while IFS=$'\t' read -r score appid linux min_ram rec_ram name pdb_tier; do
    rank=$((rank + 1))
    local display_name="$name"
    if ! protondb_allowed "$pdb_tier"; then
      display_name="$name [UNPLAYABLE]"
    fi
    printf "%-5s  %-8s  %-6s  %-6s  %-8s  %-9s  %s\n" "$rank" "$score" "${min_ram}G" "${rec_ram}G" "$linux" "${pdb_tier:-unknown}" "$display_name"
  done

  # Persist updated results for future runs (only current library entries)
  cp -f "$results_combined" "$RESULTS_CACHE" 2> /dev/null || cat "$results_combined" > "$RESULTS_CACHE"
}

main "$@"