#!/bin/bash

# GitHub repository (update if needed)
REPO="${GITHUB_REPO:-Openpanel-dev/openpanel}"

# Components to find tags for
COMPONENTS=("worker" "api" "dashboard")

# Docker compose file path
DOCKER_COMPOSE_FILE="${DOCKER_COMPOSE_FILE:-./docker-compose.yml}"

# Color codes for output
GREEN='\033[0;32m'
BLUE='\033[0;34m'
YELLOW='\033[1;33m'
RED='\033[0;31m'
GRAY='\033[0;90m'
CYAN='\033[0;36m'
NC='\033[0m' # No Color

# Show usage
show_usage() {
    echo "Usage: $0 [COMMAND] [OPTIONS]"
    echo ""
    echo "Fetches the latest Git tags for worker, api, and dashboard components"
    echo ""
    echo "Commands:"
    echo "  apply            Apply the latest tags to docker-compose.yml"
    echo "  (none)           Show the latest tags (default)"
    echo ""
    echo "Options:"
    echo "  --list, -l       List all available tags"
    echo "  --repo REPO      Specify GitHub repository (default: $REPO)"
    echo "  --file FILE      Specify docker-compose file (default: $DOCKER_COMPOSE_FILE)"
    echo "  --help, -h       Show this help message"
    echo ""
    echo "Environment variables:"
    echo "  GITHUB_REPO           Set the GitHub repository"
    echo "  DOCKER_COMPOSE_FILE   Set the docker-compose file path"
    echo ""
    echo "Examples:"
    echo "  $0                    # Show latest tags"
    echo "  $0 apply              # Update docker-compose.yml with latest tags"
    echo "  $0 --list             # List all available tags"
    echo ""
    exit 0
}

# Parse arguments
LIST_ALL=false
APPLY_MODE=false
while [[ $# -gt 0 ]]; do
    case $1 in
        apply)
            APPLY_MODE=true
            shift
            ;;
        --list|-l)
            LIST_ALL=true
            shift
            ;;
        --repo)
            REPO="$2"
            shift 2
            ;;
        --file)
            DOCKER_COMPOSE_FILE="$2"
            shift 2
            ;;
        --help|-h)
            show_usage
            ;;
        *)
            echo -e "${RED}Unknown option: $1${NC}"
            show_usage
            ;;
    esac
done

# Check if jq is installed (required for JSON parsing)
if ! command -v jq &> /dev/null; then
    echo -e "${YELLOW}jq is required but not installed${NC}\n"
    echo -e "${CYAN}jq is a lightweight JSON processor needed to parse GitHub API responses.${NC}\n"
    
    # Detect OS and suggest installation
    if [[ -f /etc/os-release ]]; then
        . /etc/os-release
        OS_ID=$ID
    elif [[ "$OSTYPE" == "darwin"* ]]; then
        OS_ID="macos"
    else
        OS_ID="unknown"
    fi
    
    # Determine installation command
    case $OS_ID in
        ubuntu|debian)
            INSTALL_CMD="sudo apt-get update && sudo apt-get install -y jq"
            ;;
        rhel|centos|fedora)
            INSTALL_CMD="sudo yum install -y jq"
            ;;
        alpine)
            INSTALL_CMD="sudo apk add --no-cache jq"
            ;;
        macos)
            INSTALL_CMD="brew install jq"
            ;;
        *)
            echo -e "${RED}Could not detect your OS.${NC}"
            echo -e "${YELLOW}Please install jq manually:${NC}"
            echo -e "  ${GREEN}Ubuntu/Debian:${NC}  sudo apt-get update && sudo apt-get install -y jq"
            echo -e "  ${GREEN}RHEL/CentOS:${NC}    sudo yum install -y jq"
            echo -e "  ${GREEN}Alpine:${NC}         sudo apk add --no-cache jq"
            echo -e "  ${GREEN}macOS:${NC}          brew install jq"
            echo ""
            exit 1
            ;;
    esac
    
    # Ask user if they want to install
    read -p "$(echo -e ${GREEN}Would you like to install jq now? [Y/n]:${NC} )" -n 1 -r
    echo
    if [[ $REPLY =~ ^[Nn]$ ]]; then
        echo -e "${RED}jq is required to continue. Please install it manually.${NC}"
        exit 1
    fi
    
    # Install jq
    echo -e "${BLUE}Installing jq...${NC}\n"
    if eval "$INSTALL_CMD"; then
        echo -e "\n${GREEN}✓ jq installed successfully!${NC}\n"
    else
        echo -e "\n${RED}✗ Failed to install jq. Please install it manually.${NC}"
        exit 1
    fi
fi

# Check if user needs to be logged in (for apply mode)
if [ "$APPLY_MODE" = true ]; then
    # Check if Docker is available
    if ! command -v docker &> /dev/null; then
        echo -e "${RED}Error: Docker is not installed or not in PATH${NC}"
        exit 1
    fi
    
    # Check if logged into docker.openpanel.dev
    echo -e "${BLUE}Checking Docker registry authentication...${NC}\n"
    
    if ! docker info 2>/dev/null | grep -q "docker.openpanel.dev" && ! grep -q "docker.openpanel.dev" ~/.docker/config.json 2>/dev/null; then
        echo -e "${YELLOW}⚠ You need to login to the OpenPanel Docker registry first!${NC}\n"
        echo -e "${CYAN}To access the latest Docker images, you need:${NC}"
        echo -e "  1. Be a supporter (starts at \$20/month)"
        echo -e "  2. Get your API key from your supporter dashboard"
        echo -e "  3. Login to the registry with:\n"
        echo -e "${GREEN}     echo \"your_api_key\" | docker login docker.openpanel.dev -u user --password-stdin${NC}\n"
        echo -e "${GRAY}For more info: https://openpanel.dev/docs/self-hosting/supporter-access-latest-docker-images${NC}\n"
        
        read -p "$(echo -e ${YELLOW}Have you already logged in? [y/N]:${NC} )" -n 1 -r
        echo
        if [[ ! $REPLY =~ ^[Yy]$ ]]; then
            echo -e "${RED}Please login first and try again.${NC}"
            exit 1
        fi
    else
        echo -e "${GREEN}✓ Docker registry authentication OK${NC}\n"
    fi
fi

echo -e "${BLUE}Fetching tags from ${REPO}...${NC}\n"

# Fetch all tags from GitHub API
TAGS_JSON=$(curl -s "https://api.github.com/repos/${REPO}/tags")

# Check if we got valid JSON response
if [ -z "$TAGS_JSON" ]; then
    echo -e "${RED}Failed to fetch tags from GitHub API${NC}"
    exit 1
fi

# Check if repository has any tags
TAGS_CLEAN=$(echo "$TAGS_JSON" | tr -d '[:space:]')
if [ "$TAGS_CLEAN" == "[]" ]; then
    echo -e "${RED}No tags found in repository${NC}"
    echo -e "${YELLOW}Create tags using: git tag <tag-name> && git push origin <tag-name>${NC}"
    echo ""
    echo -e "${GRAY}Example tag naming patterns:${NC}"
    echo -e "  ${GRAY}- worker-v1.0.0${NC}"
    echo -e "  ${GRAY}- api-v1.0.0${NC}"
    echo -e "  ${GRAY}- dashboard-v1.0.0${NC}"
    exit 1
fi

# List all tags if requested
if [ "$LIST_ALL" = true ]; then
    echo -e "${GREEN}All available tags:${NC}\n"
    echo "$TAGS_JSON" | jq -r '.[] | "  \(.name) (\(.commit.sha[0:7]))"'
    echo ""
    exit 0
fi

# Function to find latest tag matching a component
get_latest_tag() {
    local component=$1
    local output_var_tag=$2
    local output_var_sha=$3
    
    # Use jq for JSON parsing
    local tag=$(echo "$TAGS_JSON" | jq -r "[.[] | select(.name | contains(\"${component}\"))] | .[0] | .name" 2>/dev/null)
    local sha=$(echo "$TAGS_JSON" | jq -r "[.[] | select(.name | contains(\"${component}\"))] | .[0] | .commit.sha" 2>/dev/null)
    
    if [ -z "$tag" ] || [ "$tag" == "null" ]; then
        echo -e "${RED}✗${NC} ${component}: No matching tag found"
        echo
        return 1
    fi
    
    echo -e "${GREEN}✓${NC} ${component}:"
    echo -e "  Tag: ${YELLOW}${tag}${NC}"
    echo -e "  SHA: ${sha}"
    echo
    
    # Return values via eval (for compatibility with older bash)
    if [ -n "$output_var_tag" ]; then
        eval "$output_var_tag='$tag'"
    fi
    if [ -n "$output_var_sha" ]; then
        eval "$output_var_sha='$sha'"
    fi
    
    return 0
}

# Function to apply tags to docker-compose.yml
apply_tags() {
    echo -e "${CYAN}Applying tags to ${DOCKER_COMPOSE_FILE}...${NC}\n"
    
    # Check if docker-compose file exists
    if [ ! -f "$DOCKER_COMPOSE_FILE" ]; then
        echo -e "${RED}Error: Docker compose file not found: ${DOCKER_COMPOSE_FILE}${NC}"
        exit 1
    fi
    
    # Create a backup
    local backup_file="${DOCKER_COMPOSE_FILE}.backup.$(date +%Y%m%d_%H%M%S)"
    cp "$DOCKER_COMPOSE_FILE" "$backup_file"
    echo -e "${GRAY}Created backup: ${backup_file}${NC}\n"
    
    local updated=0
    local failed=0
    
    for component in "${COMPONENTS[@]}"; do
        # Get tag and SHA for this component
        local component_tag=""
        local component_sha=""
        get_latest_tag "$component" component_tag component_sha >/dev/null 2>&1
        
        if [ -z "$component_sha" ] || [ "$component_sha" == "null" ]; then
            echo -e "${RED}✗${NC} ${component}: Skipping (no tag found)"
            ((failed++))
            continue
        fi
        
        # Get first 4 characters of SHA
        local short_sha="${component_sha:0:4}"
        
        # New image tag format
        local new_image="docker.openpanel.dev/openpanel-dev/${component}:main-${short_sha}"
        
        # Find and replace the image line in docker-compose.yml
        # Look for lines like: image: something{component}something
        if grep -q "image:.*${component}" "$DOCKER_COMPOSE_FILE"; then
            # Use sed to replace the entire image line
            if [[ "$OSTYPE" == "darwin"* ]]; then
                # macOS sed syntax
                sed -i '' "s|image:.*${component}.*|image: ${new_image}|g" "$DOCKER_COMPOSE_FILE"
            else
                # Linux sed syntax
                sed -i "s|image:.*${component}.*|image: ${new_image}|g" "$DOCKER_COMPOSE_FILE"
            fi
            echo -e "${GREEN}✓${NC} Updated ${component}: ${CYAN}${new_image}${NC}"
            ((updated++))
        else
            echo -e "${YELLOW}⚠${NC} ${component}: No matching image line found in docker-compose.yml"
            ((failed++))
        fi
    done
    
    echo ""
    echo -e "${BLUE}Summary:${NC}"
    echo -e "  Updated: ${GREEN}${updated}${NC}"
    echo -e "  Failed:  ${RED}${failed}${NC}"
    echo -e "  Backup:  ${GRAY}${backup_file}${NC}"
    echo ""
    
    if [ $updated -gt 0 ]; then
        echo -e "${GREEN}Successfully updated docker-compose.yml!${NC}"
    fi
}

# Main execution
if [ "$APPLY_MODE" = true ]; then
    # Apply mode: update docker-compose.yml
    # First, show all tags
    for component in "${COMPONENTS[@]}"; do
        get_latest_tag "$component"
    done
    
    # Then apply them
    apply_tags
else
    # Default mode: just show the tags
    for component in "${COMPONENTS[@]}"; do
        get_latest_tag "$component"
    done
    
    echo -e "${GRAY}Tip: Use --list to see all available tags, or 'apply' to update docker-compose.yml${NC}"
    echo -e "${BLUE}Done!${NC}"
fi