#!/usr/bin/env bash
#
# Bootstrap for the iOS receiver. Intended to be run on a Mac with Xcode 26.
# It installs XcodeGen (if absent) from the GitHub release (no Homebrew needed),
# generates the Xcode project, and builds/tests.
#
# Usage:
#   ./bootstrap.sh                 # generate + build for device
#   ./bootstrap.sh test            # generate + run the unit tests (simulator)
#   ./bootstrap.sh build-sim       # generate + build for the simulator
#   ./bootstrap.sh generate        # just generate the project
#
# Device install/signing is intentionally left to Xcode: open
# Receiver.xcodeproj, set your Apple ID on the Receiver target, and hit Run.
set -euo pipefail

IOS_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
TOOLS_DIR="$IOS_DIR/tools"
XCODEGEN_BIN="$TOOLS_DIR/xcodegen"
PROJ="$IOS_DIR/Receiver.xcodeproj"

# 1. Xcode
if ! command -v xcodebuild >/dev/null 2>&1; then
    echo "error: xcodebuild not found. Install Xcode (26.x) and select its CLI tools." >&2
    echo "       xcode-select --install   (or: sudo xcode-select -s /Applications/Xcode.app/Contents/Developer)" >&2
    exit 1
fi

# 2. XcodeGen: prefer a system copy, then a local install, else download latest.
if ! command -v xcodegen >/dev/null 2>&1 && [ ! -x "$XCODEGEN_BIN" ]; then
    echo "Installing XcodeGen into $TOOLS_DIR ..."
    mkdir -p "$TOOLS_DIR"
    url="https://github.com/yonaskolb/XcodeGen/releases/latest/download/xcodegen.zip"
    tmp="$(mktemp -d)"
    curl -fL "$url" -o "$tmp/xcodegen.zip"
    unzip -o -q "$tmp/xcodegen.zip" -d "$TOOLS_DIR"
    # The release zip extracts to a flat binary named "xcodegen".
    if [ ! -x "$XCODEGEN_BIN" ] && [ -f "$TOOLS_DIR/xcodegen" ]; then
        chmod +x "$XCODEGEN_BIN"
    fi
    rm -rf "$tmp"
fi
XCODEGEN="$(command -v xcodegen || echo "$XCODEGEN_BIN")"
if [ ! -x "$XCODEGEN" ] && [ ! -x "$XCODEGEN_BIN" ]; then
    echo "error: XcodeGen not found and download failed." >&2
    exit 1
fi
XCODEGEN="${XCODEGEN_BIN}"

generate() {
    "$XCODEGEN_BIN" generate --spec "$IOS_DIR/project.yml" --project "$IOS_DIR"
    echo "Generated $PROJ"
}

dest_sim() { echo "${IOS_DEST:-platform=iOS Simulator,name=iPhone 16}"; }

command="${1:-build}"
generate

case "$command" in
    generate)
        ;;
    build)
        xcodebuild -project "$PROJ" -scheme Receiver -destination "generic/platform=iOS" build
        ;;
    build-sim)
        xcodebuild -project "$PROJ" -scheme Receiver -destination "$(dest_sim)" build
        ;;
    test)
        xcodebuild test -project "$PROJ" -scheme Receiver -destination "$(dest_sim)" \
            -only-testing:ReceiverTests
        ;;
    *)
        echo "usage: bootstrap.sh [generate|build|build-sim|test]" >&2
        exit 1
        ;;
esac

echo "Done."