#!/bin/bash

#-----------------------------------------------------------------------------------------------
# Common Shared Functions for Unraid Scripts
#-----------------------------------------------------------------------------------------------

# Load Master.conf relative to calling script
load_master_conf() {
    local script_dir
    script_dir="$(cd "$(dirname "${BASH_SOURCE[1]}")" && pwd)"

    local master_conf="$script_dir/../Master.conf"

    if [ -f "$master_conf" ]; then
        source "$master_conf"
        echo "Loaded Master.conf from $master_conf"
    else
        echo "Error: Master.conf not found at $master_conf"
        exit 1
    fi
}

# Parse CLI arguments (flags + VAR=value overrides)
parse_args() {
    DRY_RUN=${DRY_RUN:-false}

    for ARG in "$@"; do
        if [[ "$ARG" == *=* ]]; then
            local VAR_NAME="${ARG%%=*}"
            local VAR_VALUE="${ARG#*=}"

            if declare -p "$VAR_NAME" &>/dev/null; then
                if [[ "$VAR_NAME" =~ ^[A-Za-z_][A-Za-z0-9_]*$ ]]; then
                    printf -v "$VAR_NAME" '%s' "$VAR_VALUE"
                    echo "Overriding $VAR_NAME -> $VAR_VALUE"
                else
                    echo "Warning: Invalid variable name $VAR_NAME"
                fi
            else
                echo "Warning: Unknown variable $VAR_NAME, ignoring."
            fi
        else
            case "$ARG" in
                --dry-run|-n)
                    DRY_RUN=true
                    ;;
                --help|-h)
                    echo "Usage: script [--dry-run|-n] [VAR=value ...]"
                    exit 0
                    ;;
                *)
                    echo "Warning: Unknown argument $ARG"
                    ;;
            esac
        fi
    done
}

# Validate integer (non-negative)
validate_int() {
    local name="$1"
    local value="$2"

    if ! [[ "${value:-}" =~ ^[0-9]+$ ]]; then
        echo "Error: $name must be a non-negative integer."
        exit 1
    fi
}

# Optional: require variable to be set
require_var() {
    local var="$1"
    if [[ -z "${!var:-}" ]]; then
        echo "Error: Required variable $var is not set."
        exit 1
    fi
}