#!/bin/bash
# Shared utility methods

function printerr() {
    echo -e "\e[31m[ERROR]\e[0m $1"
}

function msg() {
    if [[ $VERBOSE -gt 0 ]]; then
        echo "$1"
    fi
}


function buildTemplate() {
    local CONFIG_FILE=""
    local SEPARATOR="§"
    declare -A ADDITIONALS

    while [[ "$#" -gt 0 ]]
    do
        case $1 in
        -f|--input-file)
            CONFIG_FILE="$2"
            ;;
        -t|--template)
            local SOURCE_FILE="$2"
            ;;
        -o|--output)
            local OUTPUT_FILE="$2"
            ;;
        -s|--separator)
            SEPARATOR="$2"
            ;;
        --add)
            arrIN=(${2//=/ })
            ADDITIONALS[${arrIN[0]}]=${arrIN[1]}
            ;;
        esac
        shift
    done

    if [[ -z $CONFIG_FILE ]]; then
        printerr "Impossible to call ${FUNCNAME} without passing a config file file"
        exit 1
    else 
        source "$CONFIG_FILE"
    fi
    if [[ -z $OUTPUT_FILE ]]; then
        printerr "Impossible to call ${FUNCNAME} without passing an output file"
        exit 1
    fi
    if [[ -z $SOURCE_FILE ]]; then
        printerr "Impossible to call ${FUNCNAME} without passing a template file"
        exit 1
    fi

    TMPFILE=`mktemp`

    cp "$SOURCE_FILE" "$OUTPUT_FILE"

    for config_key in "${!CONFIG[@]}"; do
        cp "$OUTPUT_FILE" "$TMPFILE"
        config_value="${CONFIG[$config_key]}"
        cat "$TMPFILE" | sed -e "s~${SEPARATOR}${config_key}${SEPARATOR}~${config_value}~g" > "$OUTPUT_FILE"
    done

    for config_key in "${!ADDITIONALS[@]}"; do
        cp "$OUTPUT_FILE" "$TMPFILE"
        config_value="${ADDITIONALS[$config_key]}"
        cat "$TMPFILE" | sed -e "s~${SEPARATOR}${config_key}${SEPARATOR}~${config_value}~g" > "$OUTPUT_FILE"
    done

}