#!/bin/bash
# vi:set ts=8 sw=4 et sta:
#
# Author: Clark J. Wang <dearvoid at gmail.com>
# 
# $Date$
# $HeadURL$
# $Revision$
#
#--------------------------------------------------------------------#

function trim_spaces
{
    if [ $# = 0 ]; then
        return
    fi

    local var_name=$1
    local var_value=$(eval "echo \"\$$var_name\"")
    var_value=$(echo "$var_value" | sed -e 's/^[ \t]\+//')
    var_value=$(echo "$var_value" | sed -e 's/[ \t]\+$//')
    eval "$var_name=\"$var_value\""
}

#--------------------------------------------------------------------#

function BEGIN
{
    if [ ! -e "$record_file" ]; then
        echo "$record_file not found"
        exit 1
    fi
}

#-- main ------------------------------------------------------------#

{
    BEGIN

    while true; do
        clear
        cat << END
Employee Info Additions
=======================
Enter the following details of the new employee:
Phone Number
Last Name
First Name
Middle Init
Dept #
Job Title
Date Hired

END

        # get the phone number
        while true; do
            echo -n "Phone Number (xx-xxxxxxxx): "
            read phone_number
            trim_spaces phone_number

            if [ ! "$phone_number" ]; then
                echo "Phone number not entered"
                continue
            fi

            if ! echo $phone_number | grep -Eq '^[0-9]{2}-[0-9]{8}$'; then
                echo "Invalid phone number"
                continue
            fi

            break
        done

        # get the last name
        while true; do
            echo -n "Last Name: "
            read last_name
            trim_spaces last_name

            if [ ! "$last_name" ]; then
                echo "Last name not entered"
                continue
            fi

            if ! echo $last_name | grep -Eq '^[a-zA-Z ]+$'; then
                echo "Last name can contain only alphabets and spaces"
                continue
            fi

            break
        done

        # get the first name
        while true; do
            echo -n "First Name: "
            read first_name
            trim_spaces first_name

            if [ ! "$first_name" ]; then
                echo "First name not entered"
                continue
            fi

            if ! echo $first_name | grep -Eq '^[a-zA-Z ]+$'; then
                echo "First name can contain only alphabets and spaces"
                continue
            fi

            break
        done

        # get the middle init
        while true; do
            echo -n "Middle Init: "
            read middle_init
            trim_spaces middle_init

            if [ ! "$middle_init" ]; then
                echo "Middle Init not entered"
                continue
            fi

            if ! echo $middle_init | grep -Eq '^[a-zA-Z ]+$'; then
                echo "Middle Init can contain only alphabets and spaces"
                continue
            fi

            break
        done

        # get the Dept #
        while true; do
            echo -n "Dept #: "
            read dept_no
            trim_spaces dept_no

            if [ ! "$dept_no" ]; then
                echo "Dept # not entered"
                continue
            fi

            if ! echo $dept_no | grep -Eq '^[0-9]+$'; then
                echo "Dept # can contain only digits"
                continue
            fi

            break
        done

        # get the Job Title
        while true; do
            echo -n "Job Title: "
            read job_title
            trim_spaces job_title

            if [ ! "$job_title" ]; then
                echo "Job Title not entered"
                continue
            fi

            if ! echo $job_title | grep -Eq '^[a-zA-Z ]+$'; then
                echo "Job Title can contain only alphabets and spaces"
                continue
            fi

            break
        done

        # get the Date Hired
        while true; do
            echo -n "Date Hired (dd-mm-yyyy): "
            read date_hired
            trim_spaces date_hired

            if [ ! "$date_hired" ]; then
                echo "Date Hired not entered"
                continue
            fi

            if ! echo $date_hired | grep -Eq '^[0-9]{2}-[0-9]{2}-[0-9]{4}$'; then
                echo "Invalid Date Hired"
                continue
            fi

            dd=${date_hired:0:2}
            mm=${date_hired:3:2}
            yy=${date_hired:6:4}
            if [ $dd -lt 1 -o $dd -gt 31 -o $mm -lt 1 -o $mm -gt 12 -o $yy -lt 1000 -o $yy -gt 9999 ]; then
                echo "Invalid Date Hired"
                continue
            fi

            break
        done

        if echo "$phone_number:$last_name:$first_name:$middle_init:$dept_no:$job_title:$date_hired" >> $record_file; then
            echo "Record Saved"
        fi

        echo -n "Add another? (y)es or (n)o: "
        read confirm
        if [ "$confirm" = y -o "$confirm" = Y ]; then
            continue
        else
            break
        fi
    done
}