/**
 * Copyright (c) 2013-2014 Yuichi Nishiwaki and other picrin contributors.
 *
 * 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.
 */

#ifndef PICRIN_H__
#define PICRIN_H__

#if defined(__cplusplus)
extern "C" {
#endif

#include <stddef.h>
#include <stdbool.h>
#include <setjmp.h>
#include <stdio.h>
#include <stdint.h>
#include <limits.h>
#include <assert.h>

#include "xvect/xvect.h"
#include "xhash/xhash.h"
#include "xfile/xfile.h"
#include "xrope/xrope.h"

#include "config.h"
#include "picrin/util.h"
#include "picrin/value.h"

typedef struct pic_code pic_code;

typedef struct {
  int argc, retc;
  pic_code *ip;
  pic_value *fp;
  struct pic_env *env;
  int regc;
  pic_value *regs;
  struct pic_env *up;
} pic_callinfo;

typedef struct pic_block {
  struct pic_block *prev;
  int depth;
  struct pic_proc *in, *out;
  unsigned refcnt;
} pic_block;

typedef struct {
  int argc;
  char **argv, **envp;

  pic_block *blk;

  pic_value *sp;
  pic_value *stbase, *stend;

  pic_callinfo *ci;
  pic_callinfo *cibase, *ciend;

  pic_code *ip;

  pic_sym sDEFINE, sLAMBDA, sIF, sBEGIN, sQUOTE, sSETBANG;
  pic_sym sQUASIQUOTE, sUNQUOTE, sUNQUOTE_SPLICING;
  pic_sym sDEFINE_SYNTAX, sDEFINE_MACRO;
  pic_sym sDEFINE_LIBRARY, sIMPORT, sEXPORT;
  pic_sym sCONS, sCAR, sCDR, sNILP;
  pic_sym sADD, sSUB, sMUL, sDIV, sMINUS;
  pic_sym sEQ, sLT, sLE, sGT, sGE, sNOT;

  xhash syms;                   /* name to symbol */
  xhash sym_names;              /* symbol to name */
  int sym_cnt;
  int uniq_sym_cnt;

  xhash global_tbl;
  pic_value *globals;
  size_t glen, gcapa;

  xhash macros;

  pic_value lib_tbl;
  struct pic_lib *lib;

  jmp_buf *jmp;
  struct pic_error *err;
  struct pic_jmpbuf *try_jmps;

  struct pic_heap *heap;
  struct pic_object *arena[PIC_ARENA_SIZE];
  int arena_idx;

  char *native_stack_start;
} pic_state;

typedef pic_value (*pic_func_t)(pic_state *);

void *pic_alloc(pic_state *, size_t);
#define pic_malloc(pic,size) pic_alloc(pic,size) /* obsoleted */
void *pic_realloc(pic_state *, void *, size_t);
void *pic_calloc(pic_state *, size_t, size_t);
struct pic_object *pic_obj_alloc(pic_state *, size_t, enum pic_tt);
struct pic_object *pic_obj_alloc_unsafe(pic_state *, size_t, enum pic_tt);
void pic_free(pic_state *, void *);

void pic_gc_run(pic_state *);
pic_value pic_gc_protect(pic_state *, pic_value);
int pic_gc_arena_preserve(pic_state *);
void pic_gc_arena_restore(pic_state *, int);

pic_state *pic_open(int argc, char *argv[], char **envp);
void pic_close(pic_state *);

void pic_define(pic_state *, const char *, pic_value); /* automatic export */
pic_value pic_ref(pic_state *, const char *);
void pic_set(pic_state *, const char *, pic_value);

struct pic_proc *pic_get_proc(pic_state *);
int pic_get_args(pic_state *, const char *, ...);
void pic_defun(pic_state *, const char *, pic_func_t);
void pic_defmacro(pic_state *, const char *, struct pic_proc *);
void pic_defvar(pic_state *, const char *, pic_value);

bool pic_equal_p(pic_state *, pic_value, pic_value);

pic_sym pic_intern(pic_state *, const char *, size_t);
pic_sym pic_intern_cstr(pic_state *, const char *);
const char *pic_symbol_name(pic_state *, pic_sym);
pic_sym pic_gensym(pic_state *, pic_sym);
bool pic_interned_p(pic_state *, pic_sym);

char *pic_strdup(pic_state *, const char *);
char *pic_strndup(pic_state *, const char *, size_t);

pic_value pic_read(pic_state *, const char *);
pic_list pic_parse_file(pic_state *, FILE *); /* #f for incomplete input */
pic_list pic_parse_cstr(pic_state *, const char *);

pic_value pic_load(pic_state *, const char *);

pic_value pic_apply(pic_state *, struct pic_proc *, pic_value);
pic_value pic_apply0(pic_state *, struct pic_proc *);
pic_value pic_apply1(pic_state *, struct pic_proc *, pic_value);
pic_value pic_apply2(pic_state *, struct pic_proc *, pic_value, pic_value);
pic_value pic_apply3(pic_state *, struct pic_proc *, pic_value, pic_value, pic_value);
pic_value pic_apply4(pic_state *, struct pic_proc *, pic_value, pic_value, pic_value, pic_value);
pic_value pic_apply5(pic_state *, struct pic_proc *, pic_value, pic_value, pic_value, pic_value, pic_value);
pic_value pic_apply_trampoline(pic_state *, struct pic_proc *, pic_value);
pic_value pic_eval(pic_state *, pic_value);
struct pic_proc *pic_compile(pic_state *, pic_value);
pic_value pic_macroexpand(pic_state *, pic_value);

void pic_in_library(pic_state *, pic_value);
struct pic_lib *pic_make_library(pic_state *, pic_value);
struct pic_lib *pic_find_library(pic_state *, pic_value);

#define pic_deflibrary(spec)                                            \
  pic_deflibrary_helper__(GENSYM(i), GENSYM(prev_lib), spec)
#define pic_deflibrary_helper__(i, prev_lib, spec)                      \
  for (int i = 0; ! i; )                                                \
    for (struct pic_lib *prev_lib; ! i; )                               \
      for ((prev_lib = pic->lib), pic_make_library(pic, pic_read(pic, spec)), pic_in_library(pic, pic_read(pic, spec)); ! i++; pic->lib = prev_lib)

void pic_import(pic_state *, pic_value);
void pic_export(pic_state *, pic_sym);

noreturn void pic_abort(pic_state *, const char *);
noreturn void pic_errorf(pic_state *, const char *, ...);
void pic_warnf(pic_state *, const char *, ...);
pic_str *pic_get_backtrace(pic_state *);

/* obsoleted */
noreturn static inline void pic_error(pic_state *pic, const char *msg)
{
  pic_errorf(pic, msg);
}
static inline void pic_warn(pic_state *pic, const char *msg)
{
  pic_warnf(pic, msg);
}

const char *pic_errmsg(pic_state *);

pic_value pic_write(pic_state *, pic_value); /* returns given obj */
pic_value pic_fwrite(pic_state *, pic_value, xFILE *);
void pic_printf(pic_state *, const char *, ...);
pic_value pic_display(pic_state *, pic_value);
pic_value pic_fdisplay(pic_state *, pic_value, xFILE *);
/* obsoleted macros */
#define pic_debug(pic,obj) pic_write(pic,obj)
#define pic_fdebug(pic,obj,file) pic_fwrite(pic,obj,file)

#if defined(__cplusplus)
}
#endif

#endif