/*
 * Copyright (c) 2019, ETH Zurich.
 * All rights reserved.
 *
 * This file is distributed under the terms in the attached LICENSE file.
 * If you do not find this file, copies can be found by writing to:
 * ETH Zurich D-INFK, Universitaetstrasse 6, CH-8092 Zurich. Attn: Systems Group.
 */

#ifndef SHELLY_H_
#define SHELLY_H_

// #define SHELLY_DEBUG_ON 1

#if defined(SHELLY_DEBUG_ON)
#define SHELLY_DEBUG(x...) debug_printf("[SHELLY_DEBUG] " x);
#else
#define SHELLY_DEBUG(x, ...) ((void)0)
#endif

#include <drivers/lpuart.h>
#include <drivers/gic_dist.h>
#include <aos/ump_chan.h>

#define ASCII_NL 10 // < new line
#define ASCII_CR 13 // < carriage return
#define ASCII_EOF 4 // < end of file
#define ASCII_EOT 3 // < end of text

#define SHELLY_BUF_SIZE 2048

//state that different for each client
struct shelly_st_local {
    uint32_t client_id;
    struct ump_recv_chan * recv_chan;
    struct ump_send_chan * send_chan;

};

//state that is shared for all clients
struct shelly_st_global {
    struct waitset * ws;
    bool did_init_filesystem;

    void * lpuart_base; // < virtual address of the lpuart device registers
    void * gic_base; // < virtual address of the gic device registers

    struct lpuart_s * uart_s; // < state of the uart driver
    struct gic_dist_s * gic_s; // < state of the gic driver

    u_int32_t num_clients;
    char buf[SHELLY_BUF_SIZE];
    size_t buffer_i;

    struct shelly_st_local * current_getchar_request; // < the getchar request that is currently being served, NULL if there is none.
};

bool is_newline(char c);
errval_t shelly_write_str(char * str);
void shelly_reset_buffer(void);
errval_t shelly_buffer_append(char c);
static void handle_client_request(void *arg, size_t header_size, void *header_buf, size_t payload_size);
static void send_response(struct shelly_st_local * local_state, errval_t err, char c, size_t payload_size, void *payload);
static void init_fs_on_demand(void);

#endif // ndef SHELLY_H_