configure

#!/bin/bash
set -euo pipefail

# SwiftOpenUI configure script
# Sets up the open-source Swift toolchain and Wasm SDK for cross-platform builds.

SWIFT_VERSION="6.2.4"
WASM_SDK_URL="https://download.swift.org/swift-${SWIFT_VERSION}-release/wasm-sdk/swift-${SWIFT_VERSION}-RELEASE/swift-${SWIFT_VERSION}-RELEASE_wasm.artifactbundle.tar.gz"
WASM_SDK_CHECKSUM="32fdb8772d73bb174f77b5c59bc88a0d55003d75712832129394d3465158fb43"
WASM_SDK_NAME="swift-${SWIFT_VERSION}-RELEASE_wasm"
SWIFTLY_HOME="${SWIFTLY_HOME_DIR:-$HOME/.swiftly}"

# Source swiftly env if available (ensures swiftly-managed swift is on PATH)
if [ -f "$SWIFTLY_HOME/env.sh" ]; then
    # shellcheck disable=SC1091
    source "$SWIFTLY_HOME/env.sh"
fi

RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[0;33m'
CYAN='\033[0;36m'
NC='\033[0m'

info()  { echo -e "${CYAN}[info]${NC} $1"; }
ok()    { echo -e "${GREEN}[ok]${NC} $1"; }
warn()  { echo -e "${YELLOW}[warn]${NC} $1"; }
fail()  { echo -e "${RED}[error]${NC} $1"; exit 1; }

echo ""
echo "SwiftOpenUI — configure"
echo "======================="
echo ""

# --------------------------------------------------------------------------
# 1. Check / install swiftly
# --------------------------------------------------------------------------
if command -v swiftly &>/dev/null; then
    ok "swiftly found: $(swiftly --version 2>&1 | head -1)"
else
    info "swiftly not found. Installing..."
    SWIFTLY_PKG=$(mktemp /tmp/swiftly.XXXXXX.pkg)
    curl -fSL https://download.swift.org/swiftly/darwin/swiftly.pkg -o "$SWIFTLY_PKG"
    installer -pkg "$SWIFTLY_PKG" -target CurrentUserHomeDirectory
    rm -f "$SWIFTLY_PKG"

    # Init swiftly (non-interactive)
    "$SWIFTLY_HOME/bin/swiftly" init --quiet-shell-followup 2>/dev/null || true

    # Source env for this session
    if [ -f "$SWIFTLY_HOME/env.sh" ]; then
        # shellcheck disable=SC1091
        source "$SWIFTLY_HOME/env.sh"
    fi
    hash -r 2>/dev/null || true

    if command -v swiftly &>/dev/null; then
        ok "swiftly installed successfully"
    else
        warn "swiftly installed but not on PATH yet."
        echo "    Run: source \"$SWIFTLY_HOME/env.sh\""
        echo "    Then re-run ./configure"
        exit 1
    fi
fi

# --------------------------------------------------------------------------
# 2. Check / install open-source Swift toolchain
# --------------------------------------------------------------------------
check_toolchain() {
    local ver
    ver=$(swift --version 2>&1 | head -1)
    # Xcode's Swift: "Apple Swift version 6.2.4 (swiftlang-6.2.4.1.4 clang-...)"
    # Open-source:   "Apple Swift version 6.2.4 (swift-6.2.4-RELEASE)"
    if echo "$ver" | grep -q "swiftlang-"; then
        return 1  # Xcode toolchain (no Wasm backend)
    fi
    return 0  # Open-source toolchain
}

if check_toolchain; then
    ok "Open-source Swift toolchain active: $(swift --version 2>&1 | head -1)"
else
    warn "Xcode's Swift is active (lacks Wasm backend)."
    info "Installing open-source Swift $SWIFT_VERSION via swiftly..."

    if swiftly list 2>/dev/null | grep -q "$SWIFT_VERSION"; then
        info "Swift $SWIFT_VERSION already installed, switching..."
        swiftly use "$SWIFT_VERSION"
    else
        swiftly install --use "$SWIFT_VERSION"
    fi

    # Re-source env to pick up the new toolchain PATH
    if [ -f "$SWIFTLY_HOME/env.sh" ]; then
        source "$SWIFTLY_HOME/env.sh"
    fi
    hash -r 2>/dev/null || true

    if check_toolchain; then
        ok "Switched to open-source Swift: $(swift --version 2>&1 | head -1)"
    else
        fail "Failed to switch to open-source toolchain. Xcode's Swift is still active."
    fi
fi

# --------------------------------------------------------------------------
# 3. Check / install Wasm SDK
# --------------------------------------------------------------------------
if swift sdk list 2>/dev/null | grep -q "$WASM_SDK_NAME"; then
    ok "Wasm SDK already installed: $WASM_SDK_NAME"
else
    info "Installing Wasm SDK ($WASM_SDK_NAME)..."
    swift sdk install "$WASM_SDK_URL" --checksum "$WASM_SDK_CHECKSUM"
    if swift sdk list 2>/dev/null | grep -q "$WASM_SDK_NAME"; then
        ok "Wasm SDK installed: $WASM_SDK_NAME"
    else
        fail "Wasm SDK installation failed."
    fi
fi

# --------------------------------------------------------------------------
# 4. Verify builds
# --------------------------------------------------------------------------
echo ""
info "Verifying macOS build..."
if swift build 2>&1 | tail -1 | grep -q "Build complete"; then
    ok "macOS build OK"
else
    warn "macOS build had issues (may be expected if not on macOS)"
fi

info "Verifying Wasm build..."
WASM_OUTPUT=$(swift build --swift-sdk "$WASM_SDK_NAME" 2>&1)
if echo "$WASM_OUTPUT" | grep -q "Build complete"; then
    ok "Wasm build OK"
else
    warn "Wasm build failed:"
    echo "$WASM_OUTPUT" | grep -E "error:" | head -5
fi

# --------------------------------------------------------------------------
# Done
# --------------------------------------------------------------------------
echo ""
echo "======================="
echo "Configuration complete."
echo ""
echo "Build commands:"
echo "  swift build                                  # macOS (native SwiftUI)"
echo "  swift build --swift-sdk $WASM_SDK_NAME       # WebAssembly"
echo "  swift test                                   # Run tests"
echo ""
echo "Run examples:"
echo "  swift run HelloWorld"
echo "  swift run Counter"
echo "  swift run Showcase1"
echo "  swift run Showcase2"
echo ""
echo "Note: To use the open-source toolchain in new shells, ensure"
echo "swiftly's env is sourced: source \"$SWIFTLY_HOME/env.sh\""
echo ""