#!/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 for -m flag
while [[ $# -gt 0 ]]; do
    case $1 in
        -m|--message)
            COMMIT_MESSAGE="$2"
            shift 2
            ;;
        *)
            # Keep other arguments for main logic
            break
            ;;
    esac
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 otp.c with the current git tag
    if [ -f "otp.c" ]; then
        # Update main menu version
        sed -i "s/OTP v[0-9]\+\.[0-9]\+\.[0-9]\+/OTP $NEW_VERSION/g" otp.c
        # Update ASCII output version
        sed -i "s/Version: v[0-9]\+\.[0-9]\+\.[0-9]\+/Version: $NEW_VERSION/g" otp.c
        # Update usage/help text version
        sed -i "s/Implementation v[0-9]\+\.[0-9]\+\.[0-9]\+/Implementation $NEW_VERSION/g" otp.c
        
        print_success "Updated version strings in otp.c to $NEW_VERSION"
    else
        print_warning "otp.c not found - skipping version string updates"
    fi
}

# Build functions
build_project() {
    print_status "Cleaning previous build..."
    make clean
    increment_version
    print_status "Building OTP project..."
    make
    if [ $? -eq 0 ]; then
        print_success "Build completed successfully"
    else
        print_error "Build failed"
        return 1
    fi
}

build_static() {
    print_status "Cleaning previous build..."
    make clean
    increment_version
    print_status "Building OTP project with static linking..."
    make static
    if [ $? -eq 0 ]; then
        print_success "Static build completed successfully"
    else
        print_error "Static build failed"
        return 1
    fi
}

clean_project() {
    print_status "Cleaning build artifacts..."
    make clean
    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 "${1:-build}" in
    build)
        build_project
        ;;
    static)
        build_static
        ;;
    clean)
        clean_project
        ;;
    install)
        install_project
        ;;
    uninstall)
        uninstall_project
        ;;
    *)
        echo "OTP Cipher Build Script"
        echo "Usage: $0 [-m \"commit message\"] {build|static|clean|install|uninstall}"
        echo ""
        echo "Options:"
        echo "  -m, --message \"text\"  - Specify commit message (skips interactive prompt)"
        echo ""
        echo "Commands:"
        echo "  build     - Build project with automatic version increment (default)"
        echo "  static    - Build with static linking and version increment"
        echo "  clean     - Clean build artifacts"
        echo "  install   - Install to system (requires build first)"
        echo "  uninstall - Remove from system"
        echo ""
        echo "Examples:"
        echo "  $0"
        echo "  $0 -m \"Fixed checksum parsing bug\""
        echo "  $0 --message \"Added new feature\" static"
        exit 1
        ;;
esac