#!/bin/bash

set -e
set -o pipefail

# Usage function
usage() {
    echo "Usage: wild-config <yaml_key_path>"
    echo ""
    echo "Read a value from ./config.yaml using a YAML key path."
    echo ""
    echo "Examples:"
    echo "  wild-config 'cluster.name'           # Get cluster name"
    echo "  wild-config 'apps.myapp.replicas'    # Get app replicas count"
    echo "  wild-config 'services[0].name'       # Get first service name"
    echo ""
    echo "Options:"
    echo "  -h, --help  Show this help message"
}

# Parse arguments
while [[ $# -gt 0 ]]; do
    case $1 in
        -h|--help)
            usage
            exit 0
            ;;
        -*)
            echo "Unknown option $1"
            usage
            exit 1
            ;;
        *)
            if [ -z "${KEY_PATH}" ]; then
                KEY_PATH="$1"
            else
                echo "Too many arguments"
                usage
                exit 1
            fi
            shift
            ;;
    esac
done

if [ -z "${KEY_PATH}" ]; then
    echo "Error: YAML key path is required"
    usage
    exit 1
fi

if [ ! -f "./config.yaml" ]; then
    echo "Error: ./config.yaml not found in current directory"
    exit 1
fi

# Use yq to extract the value from the YAML file
result=$(yq eval ".${KEY_PATH}" ./config.yaml)

# Check if result is null (key not found)
if [ "${result}" = "null" ]; then
    echo "Error: Key path '${KEY_PATH}' not found in ./config.yaml" >&2
    exit 1
fi

echo "${result}"