#!/usr/bin/env bash
# Build the OffTail Tailscale core into an iOS .xcframework via gomobile, from the Go shim in ../gocore.
# Output: modules/officer-net/ios/libs/TailCore.xcframework (gitignored; the podspec vendors it when present).
#
# Unlike bw-vault (which fetches a prebuilt Bitwarden release asset), Tailscale publishes no third-party
# gomobile framework — WE produce it once with `gomobile bind`, then vendor it. PROVEN working on
# Go 1.26 + Xcode 26: binds tailscale.com (tsnet/ipn/wgengine/magicsock/netstack) to arm64 + sim.
#
# Requires: Go + gomobile + gobind on PATH:
#   go install golang.org/x/mobile/cmd/gomobile@latest
#   go install golang.org/x/mobile/cmd/gobind@latest
#
# Keep TAILSCALE_REF paired with the Headscale version you run — Headscale tracks a specific Tailscale
# client protocol version, and a core built far ahead of it will fail to register.
set -euo pipefail

TAILSCALE_REF="${TAILSCALE_REF:-v1.102.0}"

HERE="$(cd "$(dirname "$0")/.." && pwd)"          # modules/officer-net
GOCORE="$HERE/gocore"
OUT="$HERE/ios/libs/TailCore.xcframework"

export PATH="$(go env GOPATH)/bin:$PATH"
command -v gomobile >/dev/null 2>&1 || { echo "✗ gomobile not on PATH — go install golang.org/x/mobile/cmd/gomobile@latest"; exit 1; }

cd "$GOCORE"
[ -f go.mod ] || go mod init officer.dev/tailcore
echo "→ pinning tailscale.com@${TAILSCALE_REF}"
go get "tailscale.com@${TAILSCALE_REF}"
# gomobile (Go 1.26) needs x/mobile as a tool dep AND bind imported, or `go mod tidy` prunes it and the
# bind fails with "missing golang.org/x/mobile dependency".
go get -tool golang.org/x/mobile/cmd/gobind
go get golang.org/x/mobile/bind

echo "→ gomobile bind -target=ios (compiles the whole Tailscale core; a few minutes)"
mkdir -p "$HERE/ios/libs"
rm -rf "$OUT"
gomobile bind -target=ios -o "$OUT" ./

[ -d "$OUT" ] || { echo "✗ bind produced no framework" >&2; exit 1; }
echo "✔ built $OUT"; du -sh "$OUT"