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#define _POSIX_C_SOURCE 200809L
#include <libgen.h>
#include <limits.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <gs.h>
#include <gtk-3.0/gtk/gtk.h>
#include <jansson.h>
#include "config.h"
#include "log.h"

#define CONFIG_PATH_SUFFIX "/.config/ap_client/config"

struct config _config;
const struct config *config = (const struct config *)&_config;

bool is_logged_in()
{
    if (!(config->access_token) || !*(config->access_token) ||
            !(config->instance_url) || !*(config->instance_url)) {
        return false;
    }
    return true;
}

const char *get_access_token()
{
    return (const char *)config->access_token;
}

const char *get_instance_url()
{
    return (const char *)config->instance_url;
}

bool is_registered()
{
    if (!(_config.client_id) || !*(_config.client_id) ||
            !(_config.client_secret) || !*(_config.client_secret) ||
            !(_config.instance_url) || !*(_config.instance_url)) {
        return false;
    }
    return true;
}

char *get_config_path()
{
    char *home = getenv("HOME");
    if (!home || !*home) {
        return NULL;
    }
    char config_path[PATH_MAX];
    g_strlcpy(config_path, home, sizeof(config_path));
    g_strlcat(config_path, CONFIG_PATH_SUFFIX, sizeof(config_path));
    return strdup(config_path);
}

void config_load()
{
    json_t *root;
    json_error_t error;

    char *path = get_config_path();
    root = json_load_file(path, 0, &error);
    if (!root) {
        log_msg(LOG_WARNING, "config_load", "json parse error: line %d: %s",
                error.line, error.text);
        free(path);
        return;
    }
    free(path);

    if (!json_is_object(root)) {
        log_msg(LOG_WARNING, "config_load", "json root is not object");
        json_decref(root);
        return;
    }

    json_t *instance_url = json_object_get(root, "instance_url");
    if (json_is_string(instance_url)) {
        _config.instance_url = strdup(json_string_value(instance_url));
    }

    json_t *client_id = json_object_get(root, "client_id");
    if (json_is_string(client_id)) {
        _config.client_id = strdup(json_string_value(client_id));
    }

    json_t *client_secret = json_object_get(root, "client_secret");
    if (json_is_string(client_secret)) {
        _config.client_secret = strdup(json_string_value(client_secret));
    }

    json_t *access_token = json_object_get(root, "access_token");
    if (json_is_string(access_token)) {
        _config.access_token = strdup(json_string_value(access_token));
    }

    json_decref(root);
}

int config_save()
{
    json_t *root;
    json_error_t error;

    root = json_pack_ex(&error, 1, "{s:s, s:s, s:s, s:s}", "instance_url",
            _config.instance_url, "client_id", _config.client_id,
            "client_secret", _config.client_secret, "access_token",
            _config.access_token);

    if (!root) {
        log_msg(LOG_WARNING, "register_app", "json pack error: line %d: %s",
                error.line, error.text);
        return -1;
    }

    char *config_path = get_config_path();
    struct stat st;
    char *dir = dirname(config_path);
    if (stat(dir, &st)) {
        if (mkdir(dir, S_IRWXU)) {
            free(config_path);
            log_msg(LOG_WARNING, "config_save", "failed to create config dir");
            return -1;
        }
    }
    free(config_path);

    if (json_dump_file(root, get_config_path(), 0)) {
        log_msg(LOG_WARNING, "config_save", "unable to save json");
        json_decref(root);
        return -1;
    }

    json_decref(root);
    return 0;
}

void config_set_client_id(const char *cid)
{
    _config.client_id = strdup(cid);
}

void config_set_client_secret(const char *cs)
{
    _config.client_secret = strdup(cs);
}

void config_set_instance_url(const char *iu)
{
    _config.instance_url = strdup(iu);
}

void config_set_access_token(const char *a)
{
    _config.access_token = strdup(a);
}

void config_cleanup()
{
    if (_config.client_id)
        free(_config.client_id);
    if (_config.client_secret)
        free(_config.client_secret);
    if (_config.instance_url)
        free(_config.instance_url);
    if (_config.access_token)
        free(_config.access_token);
}