#include "cache.h"
#include "config.h"
#include "string-list.h"

/*
 * This program exposes the C API of the configuration mechanism
 * as a set of simple commands in order to facilitate testing.
 *
 * Reads stdin and prints result of command to stdout:
 *
 * get_value -> prints the value with highest priority for the entered key
 *
 * get_value_multi -> prints all values for the entered key in increasing order
 *                   of priority
 *
 * get_int -> print integer value for the entered key or die
 *
 * get_bool -> print bool value for the entered key or die
 *
 * get_string -> print string value for the entered key or die
 *
 * configset_get_value -> returns value with the highest priority for the entered key
 *                      from a config_set constructed from files entered as arguments.
 *
 * configset_get_value_multi -> returns value_list for the entered key sorted in
 *                              ascending order of priority from a config_set
 *                              constructed from files entered as arguments.
 *
 * iterate -> iterate over all values using git_config(), and print some
 *            data for each
 *
 * Examples:
 *
 * To print the value with highest priority for key "foo.bAr Baz.rock":
 *      test-config get_value "foo.bAr Baz.rock"
 *
 */

static const char *scope_name(enum config_scope scope)
{
        switch (scope) {
        case CONFIG_SCOPE_SYSTEM:
                return "system";
        case CONFIG_SCOPE_GLOBAL:
                return "global";
        case CONFIG_SCOPE_REPO:
                return "repo";
        case CONFIG_SCOPE_CMDLINE:
                return "cmdline";
        default:
                return "unknown";
        }
}
static int iterate_cb(const char *var, const char *value, void *data)
{
        static int nr;

        if (nr++)
                putchar('\n');

        printf("key=%s\n", var);
        printf("value=%s\n", value ? value : "(null)");
        printf("origin=%s\n", current_config_origin_type());
        printf("name=%s\n", current_config_name());
        printf("scope=%s\n", scope_name(current_config_scope()));

        return 0;
}

static int early_config_cb(const char *var, const char *value, void *vdata)
{
        const char *key = vdata;

        if (!strcmp(key, var))
                printf("%s\n", value);

        return 0;
}

int cmd_main(int argc, const char **argv)
{
        int i, val;
        const char *v;
        const struct string_list *strptr;
        struct config_set cs;

        if (argc == 3 && !strcmp(argv[1], "read_early_config")) {
                read_early_config(early_config_cb, (void *)argv[2]);
                return 0;
        }

        setup_git_directory();

        git_configset_init(&cs);

        if (argc < 2) {
                fprintf(stderr, "Please, provide a command name on the command-line\n");
                goto exit1;
        } else if (argc == 3 && !strcmp(argv[1], "get_value")) {
                if (!git_config_get_value(argv[2], &v)) {
                        if (!v)
                                printf("(NULL)\n");
                        else
                                printf("%s\n", v);
                        goto exit0;
                } else {
                        printf("Value not found for \"%s\"\n", argv[2]);
                        goto exit1;
                }
        } else if (argc == 3 && !strcmp(argv[1], "get_value_multi")) {
                strptr = git_config_get_value_multi(argv[2]);
                if (strptr) {
                        for (i = 0; i < strptr->nr; i++) {
                                v = strptr->items[i].string;
                                if (!v)
                                        printf("(NULL)\n");
                                else
                                        printf("%s\n", v);
                        }
                        goto exit0;
                } else {
                        printf("Value not found for \"%s\"\n", argv[2]);
                        goto exit1;
                }
        } else if (argc == 3 && !strcmp(argv[1], "get_int")) {
                if (!git_config_get_int(argv[2], &val)) {
                        printf("%d\n", val);
                        goto exit0;
                } else {
                        printf("Value not found for \"%s\"\n", argv[2]);
                        goto exit1;
                }
        } else if (argc == 3 && !strcmp(argv[1], "get_bool")) {
                if (!git_config_get_bool(argv[2], &val)) {
                        printf("%d\n", val);
                        goto exit0;
                } else {
                        printf("Value not found for \"%s\"\n", argv[2]);
                        goto exit1;
                }
        } else if (argc == 3 && !strcmp(argv[1], "get_string")) {
                if (!git_config_get_string_const(argv[2], &v)) {
                        printf("%s\n", v);
                        goto exit0;
                } else {
                        printf("Value not found for \"%s\"\n", argv[2]);
                        goto exit1;
                }
        } else if (!strcmp(argv[1], "configset_get_value")) {
                for (i = 3; i < argc; i++) {
                        int err;
                        if ((err = git_configset_add_file(&cs, argv[i]))) {
                                fprintf(stderr, "Error (%d) reading configuration file %s.\n", err, argv[i]);
                                goto exit2;
                        }
                }
                if (!git_configset_get_value(&cs, argv[2], &v)) {
                        if (!v)
                                printf("(NULL)\n");
                        else
                                printf("%s\n", v);
                        goto exit0;
                } else {
                        printf("Value not found for \"%s\"\n", argv[2]);
                        goto exit1;
                }
        } else if (!strcmp(argv[1], "configset_get_value_multi")) {
                for (i = 3; i < argc; i++) {
                        int err;
                        if ((err = git_configset_add_file(&cs, argv[i]))) {
                                fprintf(stderr, "Error (%d) reading configuration file %s.\n", err, argv[i]);
                                goto exit2;
                        }
                }
                strptr = git_configset_get_value_multi(&cs, argv[2]);
                if (strptr) {
                        for (i = 0; i < strptr->nr; i++) {
                                v = strptr->items[i].string;
                                if (!v)
                                        printf("(NULL)\n");
                                else
                                        printf("%s\n", v);
                        }
                        goto exit0;
                } else {
                        printf("Value not found for \"%s\"\n", argv[2]);
                        goto exit1;
                }
        } else if (!strcmp(argv[1], "iterate")) {
                git_config(iterate_cb, NULL);
                goto exit0;
        }

        die("%s: Please check the syntax and the function name", argv[0]);

exit0:
        git_configset_clear(&cs);
        return 0;

exit1:
        git_configset_clear(&cs);
        return 1;

exit2:
        git_configset_clear(&cs);
        return 2;
}