#!/bin/bash
set -e

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m'

print_status() { echo -e "${BLUE}[INFO]${NC} $1"; }
print_success() { echo -e "${GREEN}[SUCCESS]${NC} $1"; }
print_warning() { echo -e "${YELLOW}[WARNING]${NC} $1"; }
print_error() { echo -e "${RED}[ERROR]${NC} $1"; }

# Global variable for commit message
COMMIT_MESSAGE=""

# Parse command line arguments - check if first arg is a command, otherwise treat as commit message
COMMAND=""
if [[ $# -gt 0 ]]; then
    case "$1" in
        build|clean|install|uninstall)
            COMMAND="$1"
            shift
            ;;
        *)
            # First argument is not a command, so default to build and treat all args as commit message
            COMMAND="build"
            ;;
    esac
else
    # No arguments, default to build
    COMMAND="build"
fi

# Any remaining arguments become the commit message
for arg in "$@"; do
    if [[ -z "$COMMIT_MESSAGE" ]]; then
        COMMIT_MESSAGE="$arg"
    else
        COMMIT_MESSAGE="$COMMIT_MESSAGE $arg"
    fi
done

# Function to automatically increment version
increment_version() {
    print_status "Incrementing version..."
    
    # Check if we're in a git repository
    if ! git rev-parse --git-dir > /dev/null 2>&1; then
        print_warning "Not in a git repository - skipping version increment"
        return 0
    fi
    
    # Get the highest version tag (not chronologically latest)
    LATEST_TAG=$(git tag -l 'v*.*.*' | sort -V | tail -n 1 || echo "v0.1.0")
    if [[ -z "$LATEST_TAG" ]]; then
        LATEST_TAG="v0.1.0"
    fi
    
    # Extract version components (remove 'v' prefix)
    VERSION=${LATEST_TAG#v}
    
    # Parse major.minor.patch using regex
    if [[ $VERSION =~ ^([0-9]+)\.([0-9]+)\.([0-9]+)$ ]]; then
        MAJOR=${BASH_REMATCH[1]}
        MINOR=${BASH_REMATCH[2]}
        PATCH=${BASH_REMATCH[3]}
    else
        print_error "Invalid version format in tag: $LATEST_TAG"
        print_error "Expected format: v0.1.0"
        return 1
    fi
    
    # Increment patch version
    NEW_PATCH=$((PATCH + 1))
    NEW_VERSION="v${MAJOR}.${MINOR}.${NEW_PATCH}"
    
    print_status "Current version: $LATEST_TAG"
    print_status "New version: $NEW_VERSION"
    
    # Stage all changes
    if git add . 2>/dev/null; then
        print_success "Staged all changes"
    else
        print_warning "Failed to stage changes (maybe not a git repository)"
    fi
    
    # Handle commit message - use global variable if set, otherwise prompt
    if [[ -z "$COMMIT_MESSAGE" ]]; then
        echo ""
        print_status "Please enter a meaningful commit message for version $NEW_VERSION:"
        echo -n "> "
        read -r COMMIT_MESSAGE
    fi
    
    # Check if user provided a message
    if [[ -z "$COMMIT_MESSAGE" ]]; then
        print_warning "No commit message provided. Using default message."
        COMMIT_MESSAGE="Automatic version increment"
    fi
    
    # Commit changes with user-provided message
    if git commit -m "Version $NEW_VERSION - $COMMIT_MESSAGE" 2>/dev/null; then
        print_success "Committed changes for version $NEW_VERSION"
    else
        print_warning "Failed to commit changes (maybe no changes to commit or not a git repository)"
    fi
    
    # Create new git tag
    if git tag "$NEW_VERSION" 2>/dev/null; then
        print_success "Created new version tag: $NEW_VERSION"
        
        # Push changes and tags to remote repository
        if git push 2>/dev/null; then
            print_success "Pushed changes to remote repository"
        else
            print_warning "Failed to push changes to remote repository"
        fi
        
        if git push --tags 2>/dev/null; then
            print_success "Pushed tags to remote repository"
        else
            print_warning "Failed to push tags to remote repository"
        fi
    else
        print_warning "Tag $NEW_VERSION already exists - using existing version"
        NEW_VERSION=$LATEST_TAG
        # Re-extract version components for existing tag
        VERSION=${NEW_VERSION#v}
        if [[ $VERSION =~ ^([0-9]+)\.([0-9]+)\.([0-9]+)$ ]]; then
            MAJOR=${BASH_REMATCH[1]}
            MINOR=${BASH_REMATCH[2]}
            NEW_PATCH=${BASH_REMATCH[3]}
        fi
    fi
    
    # Update version strings in source code
    update_source_version "$NEW_VERSION"
    
    print_success "Version updated to ${NEW_VERSION}"
}

# Function to update version strings in source code
update_source_version() {
    local NEW_VERSION="$1"
    
    print_status "Updating version strings in source code..."
    
    # Replace hardcoded version strings in src/otp.c with the current git tag
    if [ -f "src/otp.c" ]; then
        # Update main menu version
        sed -i "s/OTP v[0-9]\+\.[0-9]\+\.[0-9]\+/OTP $NEW_VERSION/g" src/otp.c
        # Update ASCII output version
        sed -i "s/Version: v[0-9]\+\.[0-9]\+\.[0-9]\+/Version: $NEW_VERSION/g" src/otp.c
        # Update usage/help text version
        sed -i "s/Implementation v[0-9]\+\.[0-9]\+\.[0-9]\+/Implementation $NEW_VERSION/g" src/otp.c
        
        print_success "Updated version strings in src/otp.c to $NEW_VERSION"
    else
        print_warning "src/otp.c not found - skipping version string updates"
    fi
}

# Cross-platform build functions
check_cross_compiler() {
    if ! command -v aarch64-linux-gnu-gcc > /dev/null 2>&1; then
        print_error "ARM64/AArch64 cross-compiler not found!"
        print_error "Install with: sudo apt install gcc-aarch64-linux-gnu"
        print_error "Or on other distros: gcc-cross-aarch64"
        return 1
    fi
    return 0
}

upload_release_asset() {
    local api_url="$1"
    local token="$2"
    local version="$3"
    local filename="$4"
    local display_name="$5"
    
    if [ ! -f "$filename" ]; then
        print_warning "Binary $filename not found, skipping upload"
        return 1
    fi
    
    print_status "Uploading $filename as '$display_name' to release..."
    
    # Get release ID first
    local release_id=$(curl -s -H "Authorization: token $token" \
                       "$api_url/releases/tags/$version" | \
                       grep -o '"id":[0-9]*' | head -n1 | cut -d: -f2)
    
    if [ -z "$release_id" ]; then
        print_error "Could not get release ID for $version"
        return 1
    fi
    
    # Upload the asset using multipart/form-data
    curl -X POST "$api_url/releases/$release_id/assets" \
         -H "Authorization: token $token" \
         -F "attachment=@$filename;filename=$display_name"
    
    if [ $? -eq 0 ]; then
        print_success "Uploaded $filename as '$display_name' successfully"
    else
        print_warning "Failed to upload $filename"
        return 1
    fi
}

create_gitea_release() {
    local version="$1"
    
    # Read token from ~/.gitea_token
    if [ ! -f "$HOME/.gitea_token" ]; then
        print_error "No ~/.gitea_token found. Cannot create release."
        print_error "Create ~/.gitea_token with your Gitea access token"
        return 1
    fi
    
    local token=$(cat "$HOME/.gitea_token" | tr -d '\n\r')
    local api_url="https://git.laantungir.net/api/v1/repos/laantungir/otp"
    
    print_status "Creating Gitea release for $version..."
    
    # Create release
    local response=$(curl -s -X POST "$api_url/releases" \
         -H "Authorization: token $token" \
         -H "Content-Type: application/json" \
         -d "{\"tag_name\": \"$version\", \"name\": \"$version\", \"body\": \"Automated release for $version\"}")
    
    if echo "$response" | grep -q '"id"'; then
        print_success "Created release $version"
        
        # Upload binaries with descriptive names from build directory
        upload_release_asset "$api_url" "$token" "$version" "build/otp-x86_64" "otp-${version}-linux-x86_64"
        upload_release_asset "$api_url" "$token" "$version" "build/otp-arm64" "otp-${version}-linux-arm64"
    else
        print_warning "Release may already exist or creation failed"
        print_status "Response: $response"
        
        # Try to upload to existing release anyway
        upload_release_asset "$api_url" "$token" "$version" "build/otp-x86_64" "otp-${version}-linux-x86_64"
        upload_release_asset "$api_url" "$token" "$version" "build/otp-arm64" "otp-${version}-linux-arm64"
    fi
}

build_project() {
    print_status "Cleaning previous build..."
    make clean
    increment_version
    
    # Check for cross-compiler
    if ! check_cross_compiler; then
        print_warning "ARM64/AArch64 cross-compiler not available, building x86_64 only"
        
        # Build x86_64 only
        print_status "Building OTP project for x86_64..."
        make CC=gcc ARCH=x86_64
        if [ $? -eq 0 ]; then
            print_success "x86_64 build completed successfully"
        else
            print_error "x86_64 build failed"
            return 1
        fi
    else
        # Build both architectures
        print_status "Building OTP project for x86_64..."
        make CC=gcc ARCH=x86_64
        if [ $? -eq 0 ]; then
            print_success "x86_64 build completed successfully"
        else
            print_error "x86_64 build failed"
            return 1
        fi
        
        print_status "Building OTP project for ARM64/AArch64..."
        # Clean only object files, not the x86_64 binary
        rm -f src/*.o
        make CC=aarch64-linux-gnu-gcc ARCH=arm64
        if [ $? -eq 0 ]; then
            print_success "ARM64/AArch64 build completed successfully"
        else
            print_error "ARM64/AArch64 build failed"
            return 1
        fi
    fi
    
    # Clean up object files after successful build
    print_status "Cleaning up object files..."
    rm -f src/*.o
    
    # Create Gitea release with binaries
    if [ -f "$HOME/.gitea_token" ]; then
        create_gitea_release "$NEW_VERSION"
    else
        print_warning "No ~/.gitea_token found. Skipping release creation."
        print_warning "Create ~/.gitea_token with your Gitea access token to enable releases."
    fi
    
    print_success "Build completed successfully"
}

clean_project() {
    print_status "Cleaning build artifacts..."
    make clean
    # Remove build directory
    rm -rf build
    print_success "Clean completed"
}

install_project() {
    print_status "Installing OTP project..."
    make install
    if [ $? -eq 0 ]; then
        print_success "Installation completed"
    else
        print_error "Installation failed"
        return 1
    fi
}

uninstall_project() {
    print_status "Uninstalling OTP project..."
    make uninstall
    if [ $? -eq 0 ]; then
        print_success "Uninstallation completed"
    else
        print_error "Uninstallation failed"
        return 1
    fi
}

# Main script logic
case "$COMMAND" in
    build)
        build_project
        ;;
    clean)
        clean_project
        ;;
    install)
        install_project
        ;;
    uninstall)
        uninstall_project
        ;;
    *)
        echo "OTP Cipher Build Script"
        echo "Usage: $0 [command] [commit message]"
        echo ""
        echo "Arguments:"
        echo "  command      - {build|clean|install|uninstall} (default: build)"
        echo "  commit message - Text to use as commit message (optional, skips interactive prompt)"
        echo ""
        echo "Commands:"
        echo "  build     - Cross-compile for x86_64 and ARM64/AArch64 with automatic version increment (default)"
        echo "  clean     - Clean build artifacts and cross-compiled binaries"
        echo "  install   - Install to system (requires build first)"
        echo "  uninstall - Remove from system"
        echo ""
        echo "Build Output:"
        echo "  build/otp-x86_64  - Native x86_64 binary"
        echo "  build/otp-arm64   - ARM64/AArch64 binary for Raspberry Pi (if cross-compiler available)"
        echo ""
        echo "Gitea Integration:"
        echo "  - Automatically creates releases with binaries if ~/.gitea_token exists"
        echo "  - Requires: ARM64 cross-compiler (gcc-aarch64-linux-gnu)"
        echo ""
        echo "Examples:"
        echo "  $0"
        echo "  $0 \"Fixed checksum parsing bug\""
        echo "  $0 build \"Added new feature\""
        echo "  $0 clean"
        exit 1
        ;;
esac