#!/usr/bin/env bash
# Launch Global (Gleam + Plushie). Scrubs non-latin-1 env and sets graphics libs.
set -euo pipefail

ROOT="$(cd "$(dirname "$0")/.." && pwd)"
cd "$ROOT"

# --- Erlang on PATH (Gleam dies with "Program not found: erl" without it) ---
if ! command -v erl >/dev/null 2>&1; then
  if command -v nix >/dev/null 2>&1; then
    ERL_OUT="$(
      nix --extra-experimental-features 'nix-command flakes' build --no-link \
        --print-out-paths --builders '' \
        nixpkgs#beamPackages.erlang 2>/dev/null | head -1
    )" || true
    if [[ -n "${ERL_OUT:-}" && -x "$ERL_OUT/bin/erl" ]]; then
      export PATH="$ERL_OUT/bin:$PATH"
    fi
  fi
  # Common Nix store fallbacks already present on this machine
  if ! command -v erl >/dev/null 2>&1; then
    for d in /nix/store/*-erlang-*/bin; do
      if [[ -x "$d/erl" ]]; then
        export PATH="$d:$PATH"
        break
      fi
    done
  fi
fi
if ! command -v erl >/dev/null 2>&1; then
  echo "error: erl not found. Gleam needs Erlang to run (target=erlang)." >&2
  echo "  nix shell nixpkgs#beamPackages.erlang nixpkgs#gleam -c gleam run" >&2
  echo "  # or: nix develop   (from this flake)" >&2
  exit 1
fi

# --- renderer ---
if [[ -z "${PLUSHIE_BINARY_PATH:-}" ]]; then
  if [[ -x "$ROOT/bin/plushie-renderer" ]]; then
    export PLUSHIE_BINARY_PATH="$ROOT/bin/plushie-renderer"
  elif [[ -x "$ROOT/result/lib/global/bin/plushie-renderer" ]]; then
    export PLUSHIE_BINARY_PATH="$ROOT/result/lib/global/bin/plushie-renderer"
  fi
fi

# --- packaged shortcut ---
if [[ "${1:-}" == "--packaged" ]]; then
  shift
  if [[ ! -x "$ROOT/result/bin/global" ]]; then
    echo "No ./result/bin/global — run: nix build .#global --builders ''" >&2
    exit 1
  fi
  exec "$ROOT/result/bin/global" "$@"
fi

if [[ -z "${PLUSHIE_BINARY_PATH:-}" || ! -x "$PLUSHIE_BINARY_PATH" ]]; then
  echo "Fetching plushie-renderer..."
  "$ROOT/scripts/fetch-renderer"
  export PLUSHIE_BINARY_PATH="$ROOT/bin/plushie-renderer"
fi

# --- graphics libs (NixOS) ---
if command -v nix >/dev/null 2>&1; then
  GFX="$(
    nix --extra-experimental-features 'nix-command flakes' eval --raw --impure --expr '
      let
        pkgs = import <nixpkgs> {};
        lib = pkgs.lib;
      in
      lib.makeLibraryPath (with pkgs; [
        wayland libxkbcommon libGL vulkan-loader
        libx11 libxcursor libxi libxrandr libffi
      ])
    ' 2>/dev/null || true
  )"
  if [[ -n "${GFX:-}" ]]; then
    export LD_LIBRARY_PATH="${GFX}${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
  fi
fi

# --- drop non-latin-1 env (nu prompts crash Plushie env FFI) ---
while IFS= read -r k; do
  unset -v "$k" 2>/dev/null || true
done < <(python3 -c '
import os
for k, v in list(os.environ.items()):
    try:
        k.encode("latin-1"); v.encode("latin-1")
    except UnicodeEncodeError:
        if k.replace("_","").isalnum():
            print(k)
')

exec gleam run "$@"