#!/usr/bin/env bash
# Fetches the helper tools FlightTube ships inside its bundle.
#
# They are not in git (~130MB together). Run this once before building.
#
#   ffmpeg / ffprobe  static arm64 binaries, shipped as Tauri sidecars
#   python + yt-dlp   a portable interpreter plus the yt-dlp zipapp
#
# yt-dlp is deliberately NOT the official yt-dlp_macos build: that is a
# PyInstaller one-file binary which unpacks ~37MB on every invocation, costing
# about eight seconds per call. The 3MB zipapp on a portable interpreter starts
# in under half a second. macOS ships only Python 3.9 and yt-dlp needs 3.10+,
# which is why the interpreter has to come along.
set -euo pipefail

TRIPLE="${1:-aarch64-apple-darwin}"
ROOT="$(cd "$(dirname "$0")/.." && pwd)"
BIN="$ROOT/src-tauri/binaries"
RES="$ROOT/src-tauri/resources"
TMP="$(mktemp -d)"
trap 'rm -rf "$TMP"' EXIT
mkdir -p "$BIN" "$RES"

echo "Fetching ffmpeg and ffprobe (static arm64)…"
# Homebrew's ffmpeg links a dozen dylibs and cannot be relocated into a bundle.
for tool in ffmpeg ffprobe; do
  curl -fsSL -A "Mozilla/5.0" -o "$TMP/$tool.zip" "https://www.osxexperts.net/${tool}9arm.zip"
  unzip -o -q "$TMP/$tool.zip" -d "$TMP"
  install -m 0755 "$TMP/$tool" "$BIN/$tool-$TRIPLE"
done

echo "Fetching the yt-dlp zipapp…"
curl -fsSL -o "$RES/yt-dlp.pyz" \
  https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp

echo "Fetching a portable Python…"
PY_TAG="$(curl -fsSL -H 'User-Agent: flighttube-build' \
  https://api.github.com/repos/astral-sh/python-build-standalone/releases/latest \
  | python3 -c 'import json,sys; print(json.load(sys.stdin)["tag_name"])')"
PY_ASSET="cpython-3.12.14+${PY_TAG}-${TRIPLE}-install_only_stripped.tar.gz"
curl -fsSL -o "$TMP/python.tar.gz" \
  "https://github.com/astral-sh/python-build-standalone/releases/download/${PY_TAG}/${PY_ASSET// /%20}"
rm -rf "$RES/python"
tar -xzf "$TMP/python.tar.gz" -C "$TMP"
mv "$TMP/python" "$RES/python"

echo "Trimming the interpreter to what yt-dlp needs…"
P="$RES/python"
rm -rf "$P/include" "$P/share" "$P/lib/pkgconfig" \
       "$P/lib/python3.12/test" "$P/lib/python3.12/idlelib" \
       "$P/lib/python3.12/tkinter" "$P/lib/python3.12/lib2to3" \
       "$P/lib/python3.12/ensurepip" "$P/lib/python3.12/turtledemo" \
       "$P/lib/python3.12/config-3.12-darwin"
find "$P" -name "libpython*.a" -delete
find "$P" -name "__pycache__" -type d -prune -exec rm -rf {} + 2>/dev/null || true

echo "Verifying:"
"$BIN/ffmpeg-$TRIPLE" -version | head -1
"$P/bin/python3.12" "$RES/yt-dlp.pyz" --version