#!/bin/bash

#==BEGIN Define script parameters==
declare -Ag appRollCall # Associative array for storing app status
declare -Ag fileRollCall # Associative array for storing file status
declare -Ag dirRollCall # Associative array for storing dir status

#===BEGIN Declare local script functions===
checkapp() {
    # Desc: If arg is a command, save result in assoc array 'appRollCall'
    # Usage: checkapp arg1 arg2 arg3 ...
    # Input: global assoc. array 'appRollCall'
    # Output: adds/updates key(value) to global assoc array 'appRollCall'
    local returnState    
    #echo "DEBUG:$(date +%S.%N)..Starting checkapp function."
    #echo "DEBUG:args: $@"
    #echo "DEBUG:returnState:$returnState"

    #===Process Args===
    for arg in "$@"; do
	#echo "DEBUG:processing arg:$arg"
	if command -v $arg 1>/dev/null 2>&1; then # Check if arg is a valid command
	    appRollCall[$arg]="true";
	    #echo "DEBUG:appRollCall[$arg]:"${appRollCall[$arg]}
	    if ! [ "$returnState" = "false" ]; then returnState="true"; fi
	else
	    appRollCall[$arg]="false"; returnState="false";
	fi
    done
    
    #for key in "${!appRollCall[@]}"; do echo "DEBUG:$key => ${appRollCall[$key]}"; done
    #echo "DEBUG:evaluating returnstate. returnState:"$returnState

    #===Determine function return code===
    if [ "$returnState" = "true" ]; then
	#echo "DEBUG:checkapp returns true for $arg";
	return 0;
    else
	#echo "DEBUG:checkapp returns false for $arg";
	return 1;
    fi
} # Check that app exists
checkfile() {
    # Desc: If arg is a file path, save result in assoc array 'fileRollCall'
    # Usage: checkfile arg1 arg2 arg3 ...
    # Input: global assoc. array 'fileRollCall'
    # Output: adds/updates key(value) to global assoc array 'fileRollCall';
    # Output: returns 0 if app found, 1 otherwise
    local returnState

    #===Process Args===
    for arg in "$@"; do
	#echo "DEBUG:processing arg:$arg"
	if [ -f "$arg" ]; then
	    fileRollCall["$arg"]="true";
	    #echo "DEBUG:fileRollCall[\"$arg\"]:"${fileRollCall["$arg"]}
	    if ! [ "$returnState" = "false" ]; then returnState="true"; fi
	else
	    fileRollCall["$arg"]="false"; returnState="false";
	fi
    done

    #for key in "${!fileRollCall[@]}"; do echo "DEBUG:fileRollCall key [$key] is:${fileRollCall[$key]}"; done
    #echo "DEBUG:evaluating returnstate. returnState:"$returnState
    
    #===Determine function return code===
    if [ "$returnState" = "true" ]; then
	#echo "DEBUG:checkapp returns true for $arg";
	return 0;
    else
	#echo "DEBUG:checkapp returns false for $arg";
	return 1;
    fi
} # Check that file exists
checkdir() {
    # Desc: If arg is a dir path, save result in assoc array 'dirRollCall'
    # Usage: checkdir arg1 arg2 arg3 ...
    # Input: global assoc. array 'dirRollCall'
    # Output: adds/updates key(value) to global assoc array 'dirRollCall';
    # Output: returns 0 if app found, 1 otherwise
    local returnState

    #===Process Args===
    for arg in "$@"; do
	#echo "DEBUG:processing arg:$arg"
	if [ -d "$arg" ]; then
	    dirRollCall["$arg"]="true";
	    #echo "DEBUG:dirRollCall[\"$arg\"]:"${dirRollCall["$arg"]}
	    if ! [ "$returnState" = "false" ]; then returnState="true"; fi
	else
	    dirRollCall["$arg"]="false"; returnState="false";
	fi
    done

    #for key in "${!dirRollCall[@]}"; do echo "DEBUG:dirRollCall key [$key] is:${dirRollCall[$key]}"; done
    #echo "DEBUG:evaluating returnstate. returnState:"$returnState
    
    #===Determine function return code===
    if [ "$returnState" = "true" ]; then
	#echo "DEBUG:checkapp returns true for $arg";
	return 0;
    else
	#echo "DEBUG:checkapp returns false for $arg";
	return 1;
    fi
} # Check that dir exists
#===END Declare local script functions===
#==END Define script parameters==

#==BEGIN sample code==
if checkapp cat; then echo "cat found."; fi
if checkapp gpg; then echo "gpg found."; fi
if checkapp emaaaacs; then echo "emaaaacs found."; fi
#==END sample code==

#==BEGIN Display errors==
#===BEGIN Display Missing Apps===
missingApps="Missing apps  :"
#for key in "${!appRollCall[@]}"; do echo "DEBUG:$key => ${appRollCall[$key]}"; done
for key in "${!appRollCall[@]}"; do
    value="${appRollCall[$key]}"
    if [ "$value" = "false" ]; then
	#echo "DEBUG:Missing apps: $key => $value";
	missingApps="$missingApps""$key "
	appMissing="true"
    fi
done
if [ "$appMissing" = "true" ]; then  # Only indicate if an app is missing.
    echo "$missingApps" 1>&2;
fi
#===END Display Missing Apps===

#===BEGIN Display Missing Files===
missingFiles="Missing files:"
#for key in "${!fileRollCall[@]}"; do echo "DEBUG:$key => ${fileRollCall[$key]}"; done
for key in "${!fileRollCall[@]}"; do
    value="${fileRollCall[$key]}"
    if [ "$value" = "false" ]; then
	#echo "DEBUG:Missing files: $key => $value";
	missingFiles="$missingFiles""$key "
	fileMissing="true"
    fi
done
if [ "$fileMissing" = "true" ]; then  # Only indicate if an app is missing.
    echo "$missingFiles" 1>&2;
fi
#===END Display Missing Files===

#===BEGIN Display Missing Directories===
missingDirs="Missing dirs:"
#for key in "${!dirRollCall[@]}"; do echo "DEBUG:$key => ${dirRollCall[$key]}"; done
for key in "${!dirRollCall[@]}"; do
    value="${dirRollCall[$key]}"
    if [ "$value" = "false" ]; then
	#echo "DEBUG:Missing dirs: $key => $value";
	missingDirs="$missingDirs""$key "
	dirMissing="true"
    fi
done
if [ "$dirMissing" = "true" ]; then  # Only indicate if an dir is missing.
    echo "$missingDirs" 1>&2;
fi
#===END Display Missing Directories===

#===BEGIN Display Failed Functions===
if [ ${#failedFunctions} -gt 0 ]; then # Only indicate if an function failed.
    echo "Failed functions:${failedFunctions[@]}" 1>&2;
fi
#===END Display Failed Functions===

#==END Display errors==