/*
 * This file is part of the Micro Python project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013, 2014 Damien P. George
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>

#include "mpconfig.h"
#include "misc.h"
#include "qstr.h"
#include "misc.h"
#include "obj.h"
#include "stream.h"
#include MICROPY_HAL_H
#include "usb.h"
#include "uart.h"
#include "pybstdio.h"

// TODO make stdin, stdout and stderr writable objects so they can
// be changed by Python code.  This requires some changes, as these
// objects are in a read-only module (py/modsys.c).

// stdio is repeated on this UART object if it's not null
pyb_uart_obj_t *pyb_stdio_uart = NULL;

void stdout_tx_str(const char *str) {
    stdout_tx_strn(str, strlen(str));
}

void stdout_tx_strn(const char *str, mp_uint_t len) {
    if (pyb_stdio_uart != PYB_UART_NONE) {
        uart_tx_strn(pyb_stdio_uart, str, len);
    }
#if 0 && defined(USE_HOST_MODE) && MICROPY_HW_HAS_LCD
    lcd_print_strn(str, len);
#endif
    if (usb_vcp_is_enabled()) {
        usb_vcp_send_strn(str, len);
    }
}

void stdout_tx_strn_cooked(const char *str, mp_uint_t len) {
    // send stdout to UART and USB CDC VCP
    if (pyb_stdio_uart != PYB_UART_NONE) {
        uart_tx_strn_cooked(pyb_stdio_uart, str, len);
    }
    if (usb_vcp_is_enabled()) {
        usb_vcp_send_strn_cooked(str, len);
    }
}

int stdin_rx_chr(void) {
    for (;;) {
#if 0
#ifdef USE_HOST_MODE
        pyb_usb_host_process();
        int c = pyb_usb_host_get_keyboard();
        if (c != 0) {
            return c;
        }
#endif
#endif

        byte c;
        if (usb_vcp_recv_byte(&c) != 0) {
            return c;
        } else if (pyb_stdio_uart != PYB_UART_NONE && uart_rx_any(pyb_stdio_uart)) {
            return uart_rx_char(pyb_stdio_uart);
        }
        __WFI();
    }
}

/******************************************************************************/
// Micro Python bindings

#define STDIO_FD_IN  (0)
#define STDIO_FD_OUT (1)
#define STDIO_FD_ERR (2)

typedef struct _pyb_stdio_obj_t {
    mp_obj_base_t base;
    int fd;
} pyb_stdio_obj_t;

void stdio_obj_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
    pyb_stdio_obj_t *self = self_in;
    print(env, "<io.FileIO %d>", self->fd);
}

STATIC mp_uint_t stdio_read(mp_obj_t self_in, void *buf, mp_uint_t size, int *errcode) {
    pyb_stdio_obj_t *self = self_in;
    if (self->fd == STDIO_FD_IN) {
        for (uint i = 0; i < size; i++) {
            int c = stdin_rx_chr();
            if (c == '\r') {
                c = '\n';
            }
            ((byte*)buf)[i] = c;
        }
        return size;
    } else {
        *errcode = EPERM;
        return MP_STREAM_ERROR;
    }
}

STATIC mp_uint_t stdio_write(mp_obj_t self_in, const void *buf, mp_uint_t size, int *errcode) {
    pyb_stdio_obj_t *self = self_in;
    if (self->fd == STDIO_FD_OUT || self->fd == STDIO_FD_ERR) {
        stdout_tx_strn_cooked(buf, size);
        return size;
    } else {
        *errcode = EPERM;
        return MP_STREAM_ERROR;
    }
}

mp_obj_t stdio_obj___exit__(mp_uint_t n_args, const mp_obj_t *args) {
    return mp_const_none;
}
static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(stdio_obj___exit___obj, 4, 4, stdio_obj___exit__);

// TODO gc hook to close the file if not already closed

STATIC const mp_map_elem_t stdio_locals_dict_table[] = {
    { MP_OBJ_NEW_QSTR(MP_QSTR_read), (mp_obj_t)&mp_stream_read_obj },
    { MP_OBJ_NEW_QSTR(MP_QSTR_readall), (mp_obj_t)&mp_stream_readall_obj },
    { MP_OBJ_NEW_QSTR(MP_QSTR_readline), (mp_obj_t)&mp_stream_unbuffered_readline_obj},
    { MP_OBJ_NEW_QSTR(MP_QSTR_write), (mp_obj_t)&mp_stream_write_obj },
    { MP_OBJ_NEW_QSTR(MP_QSTR_close), (mp_obj_t)&mp_identity_obj },
    { MP_OBJ_NEW_QSTR(MP_QSTR___del__), (mp_obj_t)&mp_identity_obj },
    { MP_OBJ_NEW_QSTR(MP_QSTR___enter__), (mp_obj_t)&mp_identity_obj },
    { MP_OBJ_NEW_QSTR(MP_QSTR___exit__), (mp_obj_t)&stdio_obj___exit___obj },
};

STATIC MP_DEFINE_CONST_DICT(stdio_locals_dict, stdio_locals_dict_table);

STATIC const mp_stream_p_t stdio_obj_stream_p = {
    .read = stdio_read,
    .write = stdio_write,
    .is_text = true,
};

STATIC const mp_obj_type_t stdio_obj_type = {
    { &mp_type_type },
    .name = MP_QSTR_FileIO,
    // TODO .make_new?
    .print = stdio_obj_print,
    .getiter = mp_identity,
    .iternext = mp_stream_unbuffered_iter,
    .stream_p = &stdio_obj_stream_p,
    .locals_dict = (mp_obj_t)&stdio_locals_dict,
};

/// \moduleref sys
/// \constant stdin - standard input (connected to USB VCP, and optional UART object)
/// \constant stdout - standard output (connected to USB VCP, and optional UART object)
/// \constant stderr - standard error (connected to USB VCP, and optional UART object)
const pyb_stdio_obj_t mp_sys_stdin_obj = {{&stdio_obj_type}, .fd = STDIO_FD_IN};
const pyb_stdio_obj_t mp_sys_stdout_obj = {{&stdio_obj_type}, .fd = STDIO_FD_OUT};
const pyb_stdio_obj_t mp_sys_stderr_obj = {{&stdio_obj_type}, .fd = STDIO_FD_ERR};