/*
 * This file is part of the MicroPython 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 <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>

#include "py/compile.h"
#include "py/runtime.h"
#include "py/repl.h"
#include "py/gc.h"
#include "py/gc_long_lived.h"
#include "py/frozenmod.h"
#include "py/mphal.h"
#if MICROPY_HW_ENABLE_USB
#include "irq.h"
#include "usb.h"
#endif
#include "lib/mp-readline/readline.h"
#include "lib/utils/pyexec.h"
#include "genhdr/mpversion.h"

pyexec_mode_kind_t pyexec_mode_kind = PYEXEC_MODE_FRIENDLY_REPL;
int pyexec_system_exit = 0;
STATIC bool repl_display_debugging_info = 0;

#define EXEC_FLAG_PRINT_EOF (1)
#define EXEC_FLAG_ALLOW_DEBUGGING (2)
#define EXEC_FLAG_IS_REPL (4)
#define EXEC_FLAG_SOURCE_IS_RAW_CODE (8)
#define EXEC_FLAG_SOURCE_IS_VSTR (16)
#define EXEC_FLAG_SOURCE_IS_FILENAME (32)

// parses, compiles and executes the code in the lexer
// frees the lexer before returning
// EXEC_FLAG_PRINT_EOF prints 2 EOF chars: 1 after normal output, 1 after exception output
// EXEC_FLAG_ALLOW_DEBUGGING allows debugging info to be printed after executing the code
// EXEC_FLAG_IS_REPL is used for REPL inputs (flag passed on to mp_compile)
STATIC int parse_compile_execute(const void *source, mp_parse_input_kind_t input_kind, int exec_flags, pyexec_result_t *result) {
 int ret = 0;
 uint32_t start = 0;

 // by default a SystemExit exception returns 0
 pyexec_system_exit = 0;

 nlr_buf_t nlr;
 if (nlr_push(&nlr) == 0) {
 mp_obj_t module_fun;
 #if MICROPY_MODULE_FROZEN_MPY
 if (exec_flags & EXEC_FLAG_SOURCE_IS_RAW_CODE) {
 // source is a raw_code object, create the function
 module_fun = mp_make_function_from_raw_code(source, MP_OBJ_NULL, MP_OBJ_NULL);
 } else
 #endif
 {
 #if MICROPY_ENABLE_COMPILER
 mp_lexer_t *lex;
 if (exec_flags & EXEC_FLAG_SOURCE_IS_VSTR) {
 const vstr_t *vstr = source;
 lex = mp_lexer_new_from_str_len(MP_QSTR__lt_stdin_gt_, vstr->buf, vstr->len, 0);
 } else if (exec_flags & EXEC_FLAG_SOURCE_IS_FILENAME) {
 lex = mp_lexer_new_from_file(source);
 } else {
 lex = (mp_lexer_t*)source;
 }
 // source is a lexer, parse and compile the script
 qstr source_name = lex->source_name;
 if (input_kind == MP_PARSE_FILE_INPUT) {
 mp_store_global(MP_QSTR___file__, MP_OBJ_NEW_QSTR(source_name));
 }
 mp_parse_tree_t parse_tree = mp_parse(lex, input_kind);
 module_fun = mp_compile(&parse_tree, source_name, MP_EMIT_OPT_NONE, exec_flags & EXEC_FLAG_IS_REPL);
 // Clear the parse tree because it has a heap pointer we don't need anymore.
 *((uint32_t volatile*) &parse_tree.chunk) = 0;
 #else
 mp_raise_msg(&mp_type_RuntimeError, translate("script compilation not supported"));
 #endif
 }

 // If the code was loaded from a file its likely to be running for a while so we'll long
 // live it and collect any garbage before running.
 if (input_kind == MP_PARSE_FILE_INPUT) {
 module_fun = make_obj_long_lived(module_fun, 6);
 gc_collect();
 }

 // execute code
 mp_hal_set_interrupt_char(CHAR_CTRL_C); // allow ctrl-C to interrupt us
 start = mp_hal_ticks_ms();
 mp_call_function_0(module_fun);
 mp_hal_set_interrupt_char(-1); // disable interrupt
 nlr_pop();
 ret = 0;
 if (exec_flags & EXEC_FLAG_PRINT_EOF) {
 mp_hal_stdout_tx_strn("\x04", 1);
 }
 } else {
 // uncaught exception
 // FIXME it could be that an interrupt happens just before we disable it here
 mp_hal_set_interrupt_char(-1); // disable interrupt
 // print EOF after normal output
 if (exec_flags & EXEC_FLAG_PRINT_EOF) {
 mp_hal_stdout_tx_strn("\x04", 1);
 }
 // check for SystemExit
 if (mp_obj_is_subclass_fast(mp_obj_get_type((mp_obj_t)nlr.ret_val), &mp_type_SystemExit)) {
 // at the moment, the value of SystemExit is unused
 ret = pyexec_system_exit;
 } else {
 if ((mp_obj_t) nlr.ret_val != MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_reload_exception))) {
 mp_obj_print_exception(&mp_plat_print, (mp_obj_t)nlr.ret_val);
 }
 ret = PYEXEC_EXCEPTION;
 }
 }
 if (result != NULL) {
 result->return_code = ret;
 if (ret != 0) {
 mp_obj_t return_value = (mp_obj_t)nlr.ret_val;
 result->exception_type = mp_obj_get_type(return_value);
 result->exception_line = -1;

 if (mp_obj_is_exception_instance(return_value)) {
 size_t n, *values;
 mp_obj_exception_get_traceback(return_value, &n, &values);
 if (values != NULL) {
 result->exception_line = values[n - 2];
 }
 }
 }
 }

 // display debugging info if wanted
 if ((exec_flags & EXEC_FLAG_ALLOW_DEBUGGING) && repl_display_debugging_info) {
 mp_uint_t ticks = mp_hal_ticks_ms() - start; // TODO implement a function that does this properly
 printf("took " UINT_FMT " ms\n", ticks);
 // qstr info
 {
 size_t n_pool, n_qstr, n_str_data_bytes, n_total_bytes;
 qstr_pool_info(&n_pool, &n_qstr, &n_str_data_bytes, &n_total_bytes);
 printf("qstr:\n n_pool=" UINT_FMT "\n n_qstr=" UINT_FMT "\n "
 "n_str_data_bytes=" UINT_FMT "\n n_total_bytes=" UINT_FMT "\n",
 (unsigned)n_pool, (unsigned)n_qstr, (unsigned)n_str_data_bytes, (unsigned)n_total_bytes);
 }

 #if MICROPY_ENABLE_GC
 // run collection and print GC info
 gc_collect();
 gc_dump_info();
 #endif
 }

 if (exec_flags & EXEC_FLAG_PRINT_EOF) {
 mp_hal_stdout_tx_strn("\x04", 1);
 }

 return ret;
}

#if MICROPY_ENABLE_COMPILER
#if MICROPY_REPL_EVENT_DRIVEN

typedef struct _repl_t {
 // This structure originally also held current REPL line,
 // but it was moved to MP_STATE_VM(repl_line) as containing
 // root pointer. Still keep structure in case more state
 // will be added later.
 //vstr_t line;
 bool cont_line;
} repl_t;

repl_t repl;

STATIC int pyexec_raw_repl_process_char(int c);
STATIC int pyexec_friendly_repl_process_char(int c);

void pyexec_event_repl_init(void) {
 MP_STATE_VM(repl_line) = vstr_new(32);
 repl.cont_line = false;
 // no prompt before printing friendly REPL banner or entering raw REPL
 readline_init(MP_STATE_VM(repl_line), "");
 if (pyexec_mode_kind == PYEXEC_MODE_RAW_REPL) {
 pyexec_raw_repl_process_char(CHAR_CTRL_A);
 } else {
 pyexec_friendly_repl_process_char(CHAR_CTRL_B);
 }
}

STATIC int pyexec_raw_repl_process_char(int c) {
 if (c == CHAR_CTRL_A) {
 // reset raw REPL
 mp_hal_stdout_tx_str("raw REPL; CTRL-B to exit\r\n");
 goto reset;
 } else if (c == CHAR_CTRL_B) {
 // change to friendly REPL
 pyexec_mode_kind = PYEXEC_MODE_FRIENDLY_REPL;
 vstr_reset(MP_STATE_VM(repl_line));
 repl.cont_line = false;
 pyexec_friendly_repl_process_char(CHAR_CTRL_B);
 return 0;
 } else if (c == CHAR_CTRL_C) {
 // clear line
 vstr_reset(MP_STATE_VM(repl_line));
 return 0;
 } else if (c == CHAR_CTRL_D) {
 // input finished
 } else {
 // let through any other raw 8-bit value
 vstr_add_byte(MP_STATE_VM(repl_line), c);
 return 0;
 }

 // indicate reception of command
 mp_hal_stdout_tx_str("OK");

 if (MP_STATE_VM(repl_line)->len == 0) {
 // exit for a soft reset
 mp_hal_stdout_tx_str("\r\n");
 vstr_clear(MP_STATE_VM(repl_line));
 return PYEXEC_FORCED_EXIT;
 }

 int ret = parse_compile_execute(MP_STATE_VM(repl_line), MP_PARSE_FILE_INPUT, EXEC_FLAG_PRINT_EOF | EXEC_FLAG_SOURCE_IS_VSTR, NULL);
 if (ret & PYEXEC_FORCED_EXIT) {
 return ret;
 }

reset:
 vstr_reset(MP_STATE_VM(repl_line));
 mp_hal_stdout_tx_str(">");

 return 0;
}

STATIC int pyexec_friendly_repl_process_char(int c) {
 int ret = readline_process_char(c);

 if (!repl.cont_line) {

 if (ret == CHAR_CTRL_A) {
 // change to raw REPL
 pyexec_mode_kind = PYEXEC_MODE_RAW_REPL;
 mp_hal_stdout_tx_str("\r\n");
 pyexec_raw_repl_process_char(CHAR_CTRL_A);
 return 0;
 } else if (ret == CHAR_CTRL_B) {
 // reset friendly REPL
 mp_hal_stdout_tx_str("\r\n");
 mp_hal_stdout_tx_str(MICROPY_FULL_VERSION_INFO);
 mp_hal_stdout_tx_str("\r\n");
 // mp_hal_stdout_tx_str("Type \"help()\" for more information.\r\n");
 goto input_restart;
 } else if (ret == CHAR_CTRL_C) {
 // break
 mp_hal_stdout_tx_str("\r\n");
 goto input_restart;
 } else if (ret == CHAR_CTRL_D) {
 // exit for a soft reset
 mp_hal_stdout_tx_str("\r\n");
 vstr_clear(MP_STATE_VM(repl_line));
 return PYEXEC_FORCED_EXIT;
 }

 if (ret < 0) {
 return 0;
 }

 if (!mp_repl_continue_with_input(vstr_null_terminated_str(MP_STATE_VM(repl_line)))) {
 goto exec;
 }

 vstr_add_byte(MP_STATE_VM(repl_line), '\n');
 repl.cont_line = true;
 readline_note_newline("... ");
 return 0;

 } else {

 if (ret == CHAR_CTRL_C) {
 // cancel everything
 mp_hal_stdout_tx_str("\r\n");
 repl.cont_line = false;
 goto input_restart;
 } else if (ret == CHAR_CTRL_D) {
 // stop entering compound statement
 goto exec;
 }

 if (ret < 0) {
 return 0;
 }

 if (mp_repl_continue_with_input(vstr_null_terminated_str(MP_STATE_VM(repl_line)))) {
 vstr_add_byte(MP_STATE_VM(repl_line), '\n');
 readline_note_newline("... ");
 return 0;
 }

exec: ;
 int ret = parse_compile_execute(MP_STATE_VM(repl_line), MP_PARSE_SINGLE_INPUT, EXEC_FLAG_ALLOW_DEBUGGING | EXEC_FLAG_IS_REPL | EXEC_FLAG_SOURCE_IS_VSTR, NULL);
 if (ret & PYEXEC_FORCED_EXIT) {
 return ret;
 }

input_restart:
 vstr_reset(MP_STATE_VM(repl_line));
 repl.cont_line = false;
 readline_init(MP_STATE_VM(repl_line), ">>> ");
 return 0;
 }
}

uint8_t pyexec_repl_active;
int pyexec_event_repl_process_char(int c) {
 pyexec_repl_active = 1;
 int res;
 if (pyexec_mode_kind == PYEXEC_MODE_RAW_REPL) {
 res = pyexec_raw_repl_process_char(c);
 } else {
 res = pyexec_friendly_repl_process_char(c);
 }
 pyexec_repl_active = 0;
 return res;
}

#else // MICROPY_REPL_EVENT_DRIVEN

int pyexec_raw_repl(void) {
 vstr_t line;
 vstr_init(&line, 32);

raw_repl_reset:
 mp_hal_stdout_tx_str("raw REPL; CTRL-B to exit\r\n");

 for (;;) {
 vstr_reset(&line);
 mp_hal_stdout_tx_str(">");
 for (;;) {
 int c = mp_hal_stdin_rx_chr();
 if (c == CHAR_CTRL_A) {
 // reset raw REPL
 goto raw_repl_reset;
 } else if (c == CHAR_CTRL_B) {
 // change to friendly REPL
 mp_hal_stdout_tx_str("\r\n");
 vstr_clear(&line);
 pyexec_mode_kind = PYEXEC_MODE_FRIENDLY_REPL;
 return 0;
 } else if (c == CHAR_CTRL_C) {
 // clear line
 vstr_reset(&line);
 } else if (c == CHAR_CTRL_D) {
 // input finished
 break;
 } else {
 // let through any other raw 8-bit value
 vstr_add_byte(&line, c);
 }
 }

 // indicate reception of command
 mp_hal_stdout_tx_str("OK");

 if (line.len == 0) {
 // exit for a soft reset
 mp_hal_stdout_tx_str("\r\n");
 vstr_clear(&line);
 return PYEXEC_FORCED_EXIT;
 }

 int ret = parse_compile_execute(&line, MP_PARSE_FILE_INPUT, EXEC_FLAG_PRINT_EOF | EXEC_FLAG_SOURCE_IS_VSTR, NULL);
 if (ret & PYEXEC_FORCED_EXIT) {
 return ret;
 }
 }
}

int pyexec_friendly_repl(void) {
 vstr_t line;
 vstr_init(&line, 32);

#if defined(USE_HOST_MODE) && MICROPY_HW_HAS_LCD
 // in host mode, we enable the LCD for the repl
 mp_obj_t lcd_o = mp_call_function_0(mp_load_name(qstr_from_str("LCD")));
 mp_call_function_1(mp_load_attr(lcd_o, qstr_from_str("light")), mp_const_true);
#endif

friendly_repl_reset:
 mp_hal_stdout_tx_str("\r\n");
 mp_hal_stdout_tx_str(MICROPY_FULL_VERSION_INFO);
 mp_hal_stdout_tx_str("\r\n");
 // mp_hal_stdout_tx_str("Type \"help()\" for more information.\r\n");

 // to test ctrl-C
 /*
 {
 uint32_t x[4] = {0x424242, 0xdeaddead, 0x242424, 0xdeadbeef};
 for (;;) {
 nlr_buf_t nlr;
 printf("pyexec_repl: %p\n", x);
 mp_hal_set_interrupt_char(CHAR_CTRL_C);
 if (nlr_push(&nlr) == 0) {
 for (;;) {
 }
 } else {
 printf("break\n");
 }
 }
 }
 */

 for (;;) {
 input_restart:

 #if MICROPY_HW_ENABLE_USB
 if (usb_vcp_is_enabled()) {
 // If the user gets to here and interrupts are disabled then
 // they'll never see the prompt, traceback etc. The USB REPL needs
 // interrupts to be enabled or no transfers occur. So we try to
 // do the user a favor and reenable interrupts.
 if (query_irq() == IRQ_STATE_DISABLED) {
 enable_irq(IRQ_STATE_ENABLED);
 mp_hal_stdout_tx_str("PYB: enabling IRQs\r\n");
 }
 }
 #endif

 vstr_reset(&line);
 int ret = readline(&line, ">>> ");
 mp_parse_input_kind_t parse_input_kind = MP_PARSE_SINGLE_INPUT;

 if (ret == CHAR_CTRL_A) {
 // change to raw REPL
 mp_hal_stdout_tx_str("\r\n");
 vstr_clear(&line);
 pyexec_mode_kind = PYEXEC_MODE_RAW_REPL;
 return 0;
 } else if (ret == CHAR_CTRL_B) {
 // reset friendly REPL
 mp_hal_stdout_tx_str("\r\n");
 goto friendly_repl_reset;
 } else if (ret == CHAR_CTRL_C) {
 // break
 mp_hal_stdout_tx_str("\r\n");
 continue;
 } else if (ret == CHAR_CTRL_D) {
 // exit for a soft reset
 mp_hal_stdout_tx_str("\r\n");
 vstr_clear(&line);
 return PYEXEC_FORCED_EXIT;
 } else if (ret == CHAR_CTRL_E) {
 // paste mode
 mp_hal_stdout_tx_str("\r\npaste mode; Ctrl-C to cancel, Ctrl-D to finish\r\n=== ");
 vstr_reset(&line);
 for (;;) {
 char c = mp_hal_stdin_rx_chr();
 if (c == CHAR_CTRL_C) {
 // cancel everything
 mp_hal_stdout_tx_str("\r\n");
 goto input_restart;
 } else if (c == CHAR_CTRL_D) {
 // end of input
 mp_hal_stdout_tx_str("\r\n");
 break;
 } else {
 // add char to buffer and echo
 vstr_add_byte(&line, c);
 if (c == '\r') {
 mp_hal_stdout_tx_str("\r\n=== ");
 } else {
 mp_hal_stdout_tx_strn(&c, 1);
 }
 }
 }
 parse_input_kind = MP_PARSE_FILE_INPUT;
 } else if (vstr_len(&line) == 0) {
 continue;
 } else {
 // got a line with non-zero length, see if it needs continuing
 while (mp_repl_continue_with_input(vstr_null_terminated_str(&line))) {
 vstr_add_byte(&line, '\n');
 ret = readline(&line, "... ");
 if (ret == CHAR_CTRL_C) {
 // cancel everything
 mp_hal_stdout_tx_str("\r\n");
 goto input_restart;
 } else if (ret == CHAR_CTRL_D) {
 // stop entering compound statement
 break;
 }
 }
 }

 ret = parse_compile_execute(&line, parse_input_kind, EXEC_FLAG_ALLOW_DEBUGGING | EXEC_FLAG_IS_REPL | EXEC_FLAG_SOURCE_IS_VSTR, NULL);
 if (ret & PYEXEC_FORCED_EXIT) {
 return ret;
 }
 }
}

#endif // MICROPY_REPL_EVENT_DRIVEN
#endif // MICROPY_ENABLE_COMPILER

int pyexec_file(const char *filename, pyexec_result_t *result) {
 return parse_compile_execute(filename, MP_PARSE_FILE_INPUT, EXEC_FLAG_SOURCE_IS_FILENAME, result);
}

#if MICROPY_MODULE_FROZEN
int pyexec_frozen_module(const char *name) {
 void *frozen_data;
 int frozen_type = mp_find_frozen_module(name, strlen(name), &frozen_data);

 switch (frozen_type) {
 #if MICROPY_MODULE_FROZEN_STR
 case MP_FROZEN_STR:
 return parse_compile_execute(frozen_data, MP_PARSE_FILE_INPUT, 0, NULL);
 #endif

 #if MICROPY_MODULE_FROZEN_MPY
 case MP_FROZEN_MPY:
 return parse_compile_execute(frozen_data, MP_PARSE_FILE_INPUT, EXEC_FLAG_SOURCE_IS_RAW_CODE, NULL);
 #endif

 default:
 printf("could not find module '%s'\n", name);
 return false;
 }
}
#endif

mp_obj_t pyb_set_repl_info(mp_obj_t o_value) {
 repl_display_debugging_info = mp_obj_get_int(o_value);
 return mp_const_none;
}

MP_DEFINE_CONST_FUN_OBJ_1(pyb_set_repl_info_obj, pyb_set_repl_info);