#include "cache.h"
#include "parse-options.h"
#include "string-list.h"

static int boolean = 0;
static int integer = 0;
static unsigned long magnitude = 0;
static timestamp_t timestamp;
static int abbrev = 7;
static int verbose = -1; /* unspecified */
static int dry_run = 0, quiet = 0;
static char *string = NULL;
static char *file = NULL;
static int ambiguous;
static struct string_list list = STRING_LIST_INIT_NODUP;

static struct {
        int called;
        const char *arg;
        int unset;
} length_cb;

static int length_callback(const struct option *opt, const char *arg, int unset)
{
        length_cb.called = 1;
        length_cb.arg = arg;
        length_cb.unset = unset;

        if (unset)
                return 1; /* do not support unset */

        *(int *)opt->value = strlen(arg);
        return 0;
}

static int number_callback(const struct option *opt, const char *arg, int unset)
{
        *(int *)opt->value = strtol(arg, NULL, 10);
        return 0;
}

static int collect_expect(const struct option *opt, const char *arg, int unset)
{
        struct string_list *expect;
        struct string_list_item *item;
        struct strbuf label = STRBUF_INIT;
        const char *colon;

        if (!arg || unset)
                die("malformed --expect option");

        expect = (struct string_list *)opt->value;
        colon = strchr(arg, ':');
        if (!colon)
                die("malformed --expect option, lacking a colon");
        strbuf_add(&label, arg, colon - arg);
        item = string_list_insert(expect, strbuf_detach(&label, NULL));
        if (item->util)
                die("malformed --expect option, duplicate %s", label.buf);
        item->util = (void *)arg;
        return 0;
}

__attribute__((format (printf,3,4)))
static void show(struct string_list *expect, int *status, const char *fmt, ...)
{
        struct string_list_item *item;
        struct strbuf buf = STRBUF_INIT;
        va_list args;

        va_start(args, fmt);
        strbuf_vaddf(&buf, fmt, args);
        va_end(args);

        if (!expect->nr)
                printf("%s\n", buf.buf);
        else {
                char *colon = strchr(buf.buf, ':');
                if (!colon)
                        die("malformed output format, output lacking colon: %s", fmt);
                *colon = '\0';
                item = string_list_lookup(expect, buf.buf);
                *colon = ':';
                if (!item)
                        ; /* not among entries being checked */
                else {
                        if (strcmp((const char *)item->util, buf.buf)) {
                                printf("-%s\n", (char *)item->util);
                                printf("+%s\n", buf.buf);
                                *status = 1;
                        }
                }
        }
        strbuf_release(&buf);
}

int cmd_main(int argc, const char **argv)
{
        const char *prefix = "prefix/";
        const char *usage[] = {
                "test-parse-options <options>",
                "",
                "A helper function for the parse-options API.",
                NULL
        };
        struct string_list expect = STRING_LIST_INIT_NODUP;
        struct option options[] = {
                OPT_BOOL(0, "yes", &boolean, "get a boolean"),
                OPT_BOOL('D', "no-doubt", &boolean, "begins with 'no-'"),
                { OPTION_SET_INT, 'B', "no-fear", &boolean, NULL,
                  "be brave", PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 1 },
                OPT_COUNTUP('b', "boolean", &boolean, "increment by one"),
                OPT_BIT('4', "or4", &boolean,
                        "bitwise-or boolean with ...0100", 4),
                OPT_NEGBIT(0, "neg-or4", &boolean, "same as --no-or4", 4),
                OPT_GROUP(""),
                OPT_INTEGER('i', "integer", &integer, "get a integer"),
                OPT_INTEGER('j', NULL, &integer, "get a integer, too"),
                OPT_MAGNITUDE('m', "magnitude", &magnitude, "get a magnitude"),
                OPT_SET_INT(0, "set23", &integer, "set integer to 23", 23),
                OPT_DATE('t', NULL, &timestamp, "get timestamp of <time>"),
                OPT_CALLBACK('L', "length", &integer, "str",
                        "get length of <str>", length_callback),
                OPT_FILENAME('F', "file", &file, "set file to <file>"),
                OPT_GROUP("String options"),
                OPT_STRING('s', "string", &string, "string", "get a string"),
                OPT_STRING(0, "string2", &string, "str", "get another string"),
                OPT_STRING(0, "st", &string, "st", "get another string (pervert ordering)"),
                OPT_STRING('o', NULL, &string, "str", "get another string"),
                OPT_NOOP_NOARG(0, "obsolete"),
                OPT_STRING_LIST(0, "list", &list, "str", "add str to list"),
                OPT_GROUP("Magic arguments"),
                OPT_ARGUMENT("quux", "means --quux"),
                OPT_NUMBER_CALLBACK(&integer, "set integer to NUM",
                        number_callback),
                { OPTION_COUNTUP, '+', NULL, &boolean, NULL, "same as -b",
                  PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH },
                { OPTION_COUNTUP, 0, "ambiguous", &ambiguous, NULL,
                  "positive ambiguity", PARSE_OPT_NOARG | PARSE_OPT_NONEG },
                { OPTION_COUNTUP, 0, "no-ambiguous", &ambiguous, NULL,
                  "negative ambiguity", PARSE_OPT_NOARG | PARSE_OPT_NONEG },
                OPT_GROUP("Standard options"),
                OPT__ABBREV(&abbrev),
                OPT__VERBOSE(&verbose, "be verbose"),
                OPT__DRY_RUN(&dry_run, "dry run"),
                OPT__QUIET(&quiet, "be quiet"),
                OPT_CALLBACK(0, "expect", &expect, "string",
                             "expected output in the variable dump",
                             collect_expect),
                OPT_END(),
        };
        int i;
        int ret = 0;

        argc = parse_options(argc, (const char **)argv, prefix, options, usage, 0);

        if (length_cb.called) {
                const char *arg = length_cb.arg;
                int unset = length_cb.unset;
                show(&expect, &ret, "Callback: \"%s\", %d",
                     (arg ? arg : "not set"), unset);
        }
        show(&expect, &ret, "boolean: %d", boolean);
        show(&expect, &ret, "integer: %d", integer);
        show(&expect, &ret, "magnitude: %lu", magnitude);
        show(&expect, &ret, "timestamp: %"PRItime, timestamp);
        show(&expect, &ret, "string: %s", string ? string : "(not set)");
        show(&expect, &ret, "abbrev: %d", abbrev);
        show(&expect, &ret, "verbose: %d", verbose);
        show(&expect, &ret, "quiet: %d", quiet);
        show(&expect, &ret, "dry run: %s", dry_run ? "yes" : "no");
        show(&expect, &ret, "file: %s", file ? file : "(not set)");

        for (i = 0; i < list.nr; i++)
                show(&expect, &ret, "list: %s", list.items[i].string);

        for (i = 0; i < argc; i++)
                show(&expect, &ret, "arg %02d: %s", i, argv[i]);

        return ret;
}