#!/bin/bash
# Laboratori Cloud - Docker Compose Validation Script
# Part of: "Corso Soluzioni Cloud"
#
# Description: Validates docker-compose.yml syntax using 'docker compose config'
# Usage: ./scripts/validate-compose.sh [path-to-compose-file]

# Color codes for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

# Function to print error message
print_error() {
    echo -e "${RED}[ERROR]${NC} $1" >&2
}

# Function to print success message
print_success() {
    echo -e "${GREEN}[SUCCESS]${NC} $1"
}

# Function to print info message
print_info() {
    echo "[INFO] $1"
}

# Function to print usage
print_usage() {
    cat << EOF
Usage: $0 [path-to-compose-file]

Validates a docker-compose.yml file using 'docker compose config' without deploying.

Arguments:
  path-to-compose-file    Path to the docker-compose.yml file to validate

Options:
  -h, --help              Show this help message

Examples:
  $0 docker-compose.yml
  $0 labs/01-iam/docker-compose.yml

Exit codes:
  0 - Validation successful
  1 - Validation failed or file not found
EOF
}

# Check for help flag
if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
    print_usage
    exit 0
fi

# Check if argument is provided
if [ -z "$1" ]; then
    print_error "No compose file specified"
    echo ""
    print_usage
    exit 1
fi

COMPOSE_FILE="$1"

# Check if file exists
if [ ! -f "$COMPOSE_FILE" ]; then
    print_error "File not found: $COMPOSE_FILE"
    exit 1
fi

print_info "Validating compose file: $COMPOSE_FILE"

# Get the directory of the compose file
COMPOSE_DIR=$(dirname "$COMPOSE_FILE")

# Try to validate using docker compose config
# We redirect stderr to stdout to capture error messages
VALIDATION_OUTPUT=$(cd "$COMPOSE_DIR" && docker compose -f "$(basename "$COMPOSE_FILE")" config 2>&1)
VALIDATION_EXIT=$?

if [ $VALIDATION_EXIT -eq 0 ]; then
    print_success "Compose file validation passed"
    print_info "YAML syntax is valid and all directives are recognized"
    exit 0
else
    print_error "Compose file validation failed"
    echo ""
    echo "Docker Compose output:"
    echo "$VALIDATION_OUTPUT"
    exit 1
fi