#!/usr/bin/env bash
# ─────────────────────────────────────────────────────────────────────────────
# Arcline OS — toolchain .deb builder
#
#   toolchain/build-tools.sh
#   ARCLINE_TOOLS_DIR=/path/to/checkouts toolchain/build-tools.sh
#
# For each tool in tools.list:
#   1. obtain source (local checkout if ARCLINE_TOOLS_DIR set, else git clone)
#   2. build a release binary (tries common Go layouts)
#   3. package a .deb into build/debs/
#
# Skips (with a warning) anything it cannot build — the OS image must never
# break because a tool repo is unreachable. Requires Go and dpkg-deb.
# ─────────────────────────────────────────────────────────────────────────────
set -euo pipefail
source "$(dirname "${BASH_SOURCE[0]}")/../scripts/common.sh"

VERSION="${VERSION:-0.1.0}"
ARCH="${ARCH:-amd64}"
SRC_DIR="$ROOT/build/toolchain-src"
LOCAL_TOOLS="${ARCLINE_TOOLS_DIR:-}"
TOOLS_LIST="$ROOT/toolchain/tools.list"

command -v go >/dev/null || die "go not found (toolchain build needs Go ≥ 1.21)"
command -v dpkg-deb >/dev/null || die "dpkg-deb not found"

mkdir -p "$SRC_DIR" "$DEB_DIR"
log "toolchain build → $DEB_DIR (version $VERSION, arch $ARCH)"

built=0; skipped=0

while IFS='|' read -r name repo desc; do
  [[ -n "$name" ]] || continue
  [[ "$name" != \#* ]] || continue

  # ── obtain source ─────────────────────────────────────────────────────────
  if [[ -n "$LOCAL_TOOLS" && -d "$LOCAL_TOOLS/$name" ]]; then
    SRC="$LOCAL_TOOLS/$name"
    log "using local checkout: $name"
  else
    SRC="$SRC_DIR/$name"
    if [[ ! -d "$SRC/.git" ]]; then
      log "cloning: $name"
      git clone --depth 1 --quiet "$repo" "$SRC" 2>/dev/null \
        || { warn "could not fetch $name (repo unreachable), skipping"; skipped=$((skipped+1)); continue; }
    fi
  fi

  # ── build ─────────────────────────────────────────────────────────────────
  BUILD=""
  for target in "./cmd/$name" "./cmd" "./" ; do
    if [[ -f "$SRC/$target/go.mod" || -f "$SRC/$target/main.go" ]]; then
      BUILD="$target"; break
    fi
  done
  if [[ -z "$BUILD" ]]; then
    warn "$name: no go.mod/main.go found in a known layout, skipping"
    skipped=$((skipped+1)); continue
  fi

  log "building: $name (go build $BUILD)"
  (
    cd "$SRC"
    go build -trimpath -mod=mod -ldflags "-s -w -X main.version=$VERSION" -o "$ROOT/build/$name" "$BUILD"
  ) || { warn "$name: go build failed, skipping"; skipped=$((skipped+1)); continue; }

  # ── package .deb ──────────────────────────────────────────────────────────
  PKG="$ROOT/build/pkg-$name"
  rm -rf "$PKG"
  mkdir -p "$PKG/DEBIAN" "$PKG/usr/bin"
  install -m0755 "$ROOT/build/$name" "$PKG/usr/bin/$name"
  cp "$ROOT/toolchain/debian/control.tmpl" "$PKG/DEBIAN/control"
  sed -i \
    -e "s/__NAME__/$name/g" \
    -e "s/__VERSION__/$VERSION/g" \
    -e "s/__ARCH__/$ARCH/g" \
    -e "s/__DESC__/${desc}/g" \
    "$PKG/DEBIAN/control"

  dpkg-deb --build --root-owner-group "$PKG" "$DEB_DIR/${name}_${VERSION}_${ARCH}.deb" >/dev/null
  log "packaged: ${name}_${VERSION}_${ARCH}.deb"
  built=$((built+1))
done < "$TOOLS_LIST"

rm -rf "$ROOT/build/pkg-"* "$ROOT/build/$name" 2>/dev/null || true

log "toolchain complete: $built built, $skipped skipped"
[[ $built -gt 0 ]] || warn "nothing was built — check repo access / ARCLINE_TOOLS_DIR"