/*
 * Copyright 2011, Oliver Tappe <zooey@hirschkaefer.de>
 * Distributed under the terms of the MIT License.
 */


#include <stdio.h>
#include <string.h>

#include "DecisionProvider.h"


DecisionProvider::DecisionProvider(bool interactive)
        :
        fInteractive(interactive)
{
}


bool
DecisionProvider::YesNoDecisionNeeded(const BString& description,
        const BString& question, const BString& yes, const BString& no,
        const BString& defaultChoice)
{
        if (description.Length() > 0)
                printf("%s\n", description.String());

        bool haveDefault = defaultChoice.Length() > 0;

        while (true) {
                printf("%s [%s/%s]%s: ", question.String(), yes.String(), no.String(),
                        haveDefault
                                ? (BString(" (") << defaultChoice << ") ").String() : "");

                if (!fInteractive) {
                        printf("%s\n", yes.String());
                        return true;
                }

                char buffer[32];
                if (fgets(buffer, 32, stdin)) {
                        if (haveDefault &&  (buffer[0] == '\n' || buffer[0] == '\0'))
                                return defaultChoice == yes;
                        int length = strlen(buffer);
                        for (int i = 1; i <= length; ++i) {
                                if (yes.ICompare(buffer, i) == 0) {
                                        if (no.ICompare(buffer, i) != 0)
                                                return true;
                                } else if (no.Compare(buffer, i) == 0) {
                                        if (yes.ICompare(buffer, i) != 0)
                                                return false;
                                } else
                                        break;
                        }
                        fprintf(stderr, "*** please enter '%s' or '%s'\n", yes.String(),
                                no.String());
                }
        }
}