/* SPDX-License-Identifier: GPL-3.0-or-later */
/* Copyright 2022 Ivan Polyakov */

#include "app.h"
#include <stdlib.h>
#include <string.h>

/*!
 * \brief Selects a route handler based on requested path.
 * \param app Application instance.
 * \param req Request.
 * \return Pointer to route handler.
 */
static rpd_route *routes_fabric(rpd_app *app, rpd_req *req);

int rpd_app_create(rpd_app *app)
{
    app->running = app->routes_len = 0;
    app->routes = NULL;
    return 0;
}

int rpd_app_add_route(rpd_app *app, const char *path, rpd_route_cb cb,
    void *userdata)
{
    rpd_route route;
    if (rpd_route_init(&route, path, cb, userdata))
        return 1;

    app->routes = (rpd_route *) realloc(app->routes, sizeof(rpd_route) * (app->routes_len + 1));
    if (!app->routes)
        return 2;

    app->routes[app->routes_len++] = route;
    return 0;
}

void rpd_app_handle_request(rpd_app *app, rpd_req *req, rpd_res *res)
{
    rpd_route *route = routes_fabric(app, req);
    if (!route) {
        res->status = rpd_res_st_not_found;
        return;
    }

    route->cb(req, res, route->userdata);
}

static rpd_route *routes_fabric(rpd_app *app, rpd_req *req)
{
    const rpd_url *req_path, *route_path = 0;
    req_path = &req->path;

    for (int i = 0; i < app->routes_len; i++) {
        route_path = &app->routes[i].path;
        if (req_path->parts_len != route_path->parts_len)
            continue;

        int match = 1;
        for (int j = 0; j < route_path->parts_len && match; j++) {
            int cur_part_is_dyn = route_path->parts[i][0] == ':';
            if (!cur_part_is_dyn && strcmp(req_path->parts[i], route_path->parts[i])) {
                match = 0;
            }
        }

        if (!match)
            continue;

        rpd_keyval_init(&req->params, 0);
        rpd_url_params_parse_keys(&req->params, route_path);
        rpd_url_params_parse_vals(&req->params, req_path, route_path);
        return &app->routes[i];
    }
    return NULL;
}