#!/bin/bash
# https://stackoverflow.com/questions/10118381/bash-script-to-automatically-test-program-output-c

# If number of arguments less then 1; print usage and exit
if [ $# -lt 1 ]; then
    printf "Usage: %s <application>\n" "$0" >&2
    exit 1
fi

bin="$1"                        # The application (from command arg)
diff="colordiff -ya"                    # Diff command, or what ever
folder="Comp2019/meta1"

# An array, do not have to declare it, but is supposedly faster
# declare -a file_base=("file1" "file2" "file3")
file_base=($(ls -1 ${folder} -I "*.out"))

# Loop the array
for file in "${file_base[@]}"; do
    # Padd file_base with suffixes
    file_in="${folder}/$file"                           # The in file
    file_out="${file//.dgo/}"
    file_out_val="${folder}/${file_out//.go/}.out"      # The out file to check against
    file_out_tst="$(mktemp)"                            # The outfile from test application

    # Validate infile exists (do the same for out validate file)
    if [ ! -f "$file_in" ]; then
        printf "In file %s is missing\n" "$file_in"
        continue;
    fi
    if [ ! -f "$file_out_val" ]; then
        printf "Validation file %s is missing\n" "$file_out_val"
        continue;
    fi

    printf "Testing against %s\n" "$file_in"

    # Run application, redirect in file to app, and output to out file
    "./$bin" < "$file_in" > "$file_out_tst"

    # Execute diff
    echo "----------------------------------------------------------------------------------"
    $diff "$file_out_tst" "$file_out_val"
    e_code=$?
    echo "----------------------------------------------------------------------------------"

    # Check exit code from previous command (ie diff)
    # We need to add this to a variable else we can't print it
    # as it will be changed by the if [
    # If not 0 then the files differ (at least with diff)
    if [ $e_code != 0 ]; then
            printf "TEST FAIL: %s\n" "$e_code"
    else
            printf "TEST OK!: %s\n" "$e_code"
    fi

    # Pause by prompt
    read -p "Enter a/q to abort, anything else to continue: " input_data
    # If input is "a" then abort
    [ "$input_data" == "a" ] && break
    [ "$input_data" == "q" ] && break

done

# Clean exit with status 0
exit 0