#!/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"; }

# 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"
    
    # Create new git tag
    if git tag "$NEW_VERSION" 2>/dev/null; then
        print_success "Created new version tag: $NEW_VERSION"
    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 file for compatibility
    echo "${NEW_VERSION#v}" > VERSION
    print_success "Updated VERSION file to ${NEW_VERSION#v}"
    
    # Generate version.h header file
    mkdir -p src
    cat > src/version.h << EOF
/*
 * Auto-Generated Version Header
 * DO NOT EDIT THIS FILE MANUALLY - Generated by build script
 */

#ifndef VERSION_H
#define VERSION_H

#define VERSION_MAJOR ${MAJOR}
#define VERSION_MINOR ${MINOR}
#define VERSION_PATCH ${NEW_PATCH}
#define VERSION_STRING "${MAJOR}.${MINOR}.${NEW_PATCH}"
#define VERSION_TAG "${NEW_VERSION}"

/* Build information */
#define BUILD_DATE "$(date +%Y-%m-%d)"
#define BUILD_TIME "$(date +%H:%M:%S)"
#define BUILD_TIMESTAMP "$(date '+%Y-%m-%d %H:%M:%S')"

/* Git information */
#define GIT_HASH "$(git rev-parse --short HEAD 2>/dev/null || echo 'unknown')"
#define GIT_BRANCH "$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo 'unknown')"

/* Display versions */
#define VERSION_DISPLAY "${NEW_VERSION}"
#define VERSION_FULL_DISPLAY "${NEW_VERSION} ($(date '+%Y-%m-%d %H:%M:%S'), $(git rev-parse --short HEAD 2>/dev/null || echo 'unknown'))"

/* Version API functions */
const char* get_version(void);
const char* get_version_full(void);
const char* get_build_info(void);

#endif /* VERSION_H */
EOF

    # Generate version.c implementation file
    cat > src/version.c << EOF
/*
 * Auto-Generated Version Implementation
 * DO NOT EDIT THIS FILE MANUALLY - Generated by build script
 */

#include "version.h"

const char* get_version(void) {
    return VERSION_TAG;
}

const char* get_version_full(void) {
    return VERSION_FULL_DISPLAY;
}

const char* get_build_info(void) {
    return "Built on " BUILD_DATE " at " BUILD_TIME " from commit " GIT_HASH " on branch " GIT_BRANCH;
}
EOF

    print_success "Generated version header files"
}

# 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
    rm -f VERSION src/version.h src/version.c
    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
        ;;
    version)
        increment_version
        print_status "Version information generated"
        ;;
    *)
        echo "OTP Cipher Build Script"
        echo "Usage: $0 {build|static|clean|install|uninstall|version}"
        echo ""
        echo "Commands:"
        echo "  build     - Build project with automatic version increment (default)"
        echo "  static    - Build with static linking"
        echo "  clean     - Clean build artifacts and generated files"
        echo "  install   - Install to system (requires build first)"
        echo "  uninstall - Remove from system"
        echo "  version   - Generate version files only"
        exit 1
        ;;
esac