#!/usr/bin/env bash
# One-time (or cold-cache) environment bring-up:
#   - installs/activates a pinned Emscripten SDK
#   - checks for bison
#   - fetches vpinball + libwinevbs at their pinned commits into vendor/
#   - applies this project's patches to both
#
# Safe to re-run: skips work that's already done at the pinned versions.
set -euo pipefail

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
source "$ROOT_DIR/scripts/versions.sh"

VENDOR_DIR="$ROOT_DIR/vendor"
EMSDK_DIR="$ROOT_DIR/emsdk"

echo "== Checking bison =="
if ! command -v bison >/dev/null 2>&1; then
   echo "ERROR: bison not found on PATH. Install bison >= ${BISON_MIN_VERSION} and re-run." >&2
   exit 1
fi
echo "Found: $(bison --version | head -1)"

echo "== Setting up Emscripten SDK ${EMSDK_VERSION} =="
if [ ! -d "$EMSDK_DIR" ]; then
   git clone --depth 1 https://github.com/emscripten-core/emsdk.git "$EMSDK_DIR"
fi
(
   cd "$EMSDK_DIR"
   if [ "$(cat .installed-version 2>/dev/null || true)" != "$EMSDK_VERSION" ]; then
      ./emsdk install "$EMSDK_VERSION"
      ./emsdk activate "$EMSDK_VERSION"
      echo "$EMSDK_VERSION" > .installed-version
   fi
)
echo "emsdk ready at $EMSDK_DIR (source $EMSDK_DIR/emsdk_env.sh before building)"

fetch_pinned() {
   local name="$1" url="$2" sha="$3" dest="$4"
   local sentinel="$dest/.vpinball-wasm-sha"

   if [ -f "$sentinel" ] && [ "$(cat "$sentinel")" = "$sha" ]; then
      echo "$name already at pinned commit $sha, skipping fetch."
      return
   fi

   echo "== Fetching $name @ $sha =="
   rm -rf "$dest"
   mkdir -p "$dest"
   curl -sL "$url/archive/${sha}.tar.gz" -o "/tmp/${name}-${sha}.tar.gz"
   tar xzf "/tmp/${name}-${sha}.tar.gz" -C "$dest" --strip-components=1
   rm -f "/tmp/${name}-${sha}.tar.gz"
   git -C "$dest" init -q
   git -C "$dest" add -A
   # -c user.name/user.email (not --author) are needed here: --author only sets
   # the commit's author field, but git also requires a *committer* identity,
   # which a fresh CI container has no ~/.gitconfig to supply. Scoped to this
   # one invocation only - doesn't touch any persistent git config.
   git -C "$dest" -c user.name="vpinball-wasm setup" -c user.email="noreply@localhost" \
      commit -q -m "vendor: $name @ $sha" --author="vpinball-wasm setup <noreply@localhost>"
   echo "$sha" > "$sentinel"
}

apply_patches() {
   local name="$1" dest="$2"
   local patch_dir="$ROOT_DIR/patches/$name"
   [ -d "$patch_dir" ] || return 0

   for patch in "$patch_dir"/*.patch; do
      [ -e "$patch" ] || continue
      echo "== Applying $(basename "$patch") to $name =="
      if git -C "$dest" apply --reverse --check "$patch" 2>/dev/null; then
         echo "  already applied, skipping."
      else
         git -C "$dest" apply "$patch"
      fi
   done
}

mkdir -p "$VENDOR_DIR"
fetch_pinned "vpinball" "https://github.com/vpinball/vpinball" "$VPINBALL_SHA" "$VENDOR_DIR/vpinball"
fetch_pinned "libwinevbs" "https://github.com/vpinball/libwinevbs" "$LIBWINEVBS_SHA" "$VENDOR_DIR/libwinevbs"

apply_patches "vpinball" "$VENDOR_DIR/vpinball"
apply_patches "libwinevbs" "$VENDOR_DIR/libwinevbs"

echo ""
echo "== Setup complete =="
echo "Next: source $EMSDK_DIR/emsdk_env.sh && ./scripts/build-deps.sh"