#!/bin/bash
# VT_Player Build Script
# Builds the application with proper dependency checking

set -e

PROJECT_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
BUILD_OUTPUT="$PROJECT_ROOT/vt_player"

echo "════════════════════════════════════════════════════════════════"
echo "  VT_Player Build Script"
echo "════════════════════════════════════════════════════════════════"
echo ""

# Check if go is installed
if ! command -v go &> /dev/null; then
    echo "❌ ERROR: Go is not installed. Please install Go 1.21 or later."
    exit 1
fi

echo "📦 Go version:"
go version
echo ""

# Change to project directory
cd "$PROJECT_ROOT"

# Check for system dependencies (X11 development libraries)
echo "🔍 Checking system dependencies..."
MISSING_DEPS=()

# Check for essential X11 libraries needed by Fyne/GLFW
if ! pkg-config --exists x11 2>/dev/null; then
    MISSING_DEPS+=("libX11-devel")
fi
if ! pkg-config --exists xcursor 2>/dev/null; then
    MISSING_DEPS+=("libXcursor-devel")
fi
if ! pkg-config --exists xrandr 2>/dev/null; then
    MISSING_DEPS+=("libXrandr-devel")
fi
if ! pkg-config --exists gl 2>/dev/null; then
    MISSING_DEPS+=("mesa-libGL-devel")
fi

if [ ${#MISSING_DEPS[@]} -gt 0 ]; then
    echo "⚠️  Missing system dependencies: ${MISSING_DEPS[*]}"
    echo "📥 Attempting to install dependencies..."

    if [ -f "$PROJECT_ROOT/scripts/install-deps-linux.sh" ]; then
        bash "$PROJECT_ROOT/scripts/install-deps-linux.sh" || {
            echo "❌ Failed to install dependencies automatically"
            echo "Please run: sudo bash $PROJECT_ROOT/scripts/install-deps-linux.sh"
            exit 1
        }
    else
        echo "❌ Dependency installer not found"
        echo "Please install missing packages manually: ${MISSING_DEPS[*]}"
        exit 1
    fi
else
    echo "✓ System dependencies OK"
fi
echo ""

echo "🧹 Cleaning previous build..."
rm -f "$BUILD_OUTPUT" 2>/dev/null || true
go clean 2>/dev/null || true
echo "✓ Cleaned"
echo ""

echo "⬇️  Ensuring Go modules are downloaded..."
go mod download
go mod verify
echo "✓ Dependencies ready"
echo ""

echo "🔨 Building VT_Player..."
# Fyne needs cgo for GLFW/OpenGL bindings; build with CGO enabled.
export CGO_ENABLED=1
if go build -o "$BUILD_OUTPUT" .; then
    echo "✓ Build successful!"
    echo ""
    echo "════════════════════════════════════════════════════════════════"
    echo "✅ BUILD COMPLETE"
    echo "════════════════════════════════════════════════════════════════"
    echo ""
    echo "Output: $BUILD_OUTPUT"
    echo "Size: $(du -h "$BUILD_OUTPUT" | cut -f1)"
    echo ""
    echo "To run:"
    echo "  $PROJECT_ROOT/vt_player"
    echo ""
    echo "Or use the convenience script:"
    echo "  source $PROJECT_ROOT/scripts/alias.sh"
    echo "  vt_player"
    echo ""
else
    echo "❌ Build failed!"
    exit 1
fi