#ifndef BYEBUG
#define BYEBUG

#include <ruby.h>
#include <ruby/debug.h>

typedef struct rb_trace_arg_struct rb_trace_point_t;

/* flags */
#define CTX_FL_SUSPEND      (1<<1)
#define CTX_FL_TRACING      (1<<2)
#define CTX_FL_SKIPPED      (1<<3)
#define CTX_FL_DEAD         (1<<4)
#define CTX_FL_ENABLE_BKPT  (1<<5)
#define CTX_FL_FORCE_MOVE   (1<<6)
#define CTX_FL_CATCHING     (1<<7)

/* macro functions */
#define CTX_FL_TEST(c,f)  ((c)->flags & (f))
#define CTX_FL_SET(c,f)   do { (c)->flags |= (f); } while (0)
#define CTX_FL_UNSET(c,f) do { (c)->flags &= ~(f); } while (0)

/* types */
typedef enum {
  CTX_STOP_NONE,
  CTX_STOP_STEP,
  CTX_STOP_BREAKPOINT,
  CTX_STOP_CATCHPOINT
} ctx_stop_reason;

typedef struct debug_frame_t {
    struct debug_frame_t *prev;
    char *file;
    int line;
    VALUE method_id;
    VALUE defined_class;
    VALUE binding;
    VALUE self;
} debug_frame_t;

typedef struct {
  debug_frame_t *stack;
  int stack_size;
  int flags;
  ctx_stop_reason stop_reason;
  int dest_frame;
  int lines;                   /* # of lines in dest_frame before stopping */
  int steps;                   /* # of steps before stopping */
  int stop_frame;              /* frame number after which we must stop */
  char *last_file;
  int last_line;
} debug_context_t;

/* functions */
extern VALUE Init_context(VALUE mByebug);
extern VALUE Context_create();
extern VALUE Context_dup(debug_context_t *context);
extern void reset_stepping_stop_points(debug_context_t *context);

extern void push_frame(debug_context_t *context, char* file, int lineno,
                       VALUE method_id, VALUE defined_class, VALUE binding,
                       VALUE self);

extern void pop_frame(debug_context_t *context);

extern void update_frame(debug_frame_t *context, char* file, int lineno,
                         VALUE method_id, VALUE defined_class, VALUE binding,
                         VALUE self);

/* utility functions */
static inline int
classname_cmp(VALUE name, VALUE klass)
{
    VALUE mod_name;
    VALUE class_name = (Qnil == name) ? rb_str_new2("main") : name;
    if (klass == Qnil) return(0);
    mod_name = rb_mod_name(klass);
    return (mod_name != Qnil && rb_str_cmp(class_name, mod_name) == 0);
}

/* breakpoints & catchpoints */
enum bp_type {BP_POS_TYPE, BP_METHOD_TYPE};
enum hit_condition {HIT_COND_NONE, HIT_COND_GE, HIT_COND_EQ, HIT_COND_MOD};

typedef struct {
  int id;
  enum bp_type type;
  VALUE source;
  union
  {
      int line;
      ID  mid;
  } pos;
  VALUE expr;
  VALUE enabled;
  int hit_count;
  int hit_value;
  enum hit_condition hit_condition;
} breakpoint_t;

extern VALUE catchpoint_hit_count(VALUE catchpoints, VALUE exception, VALUE *exception_name);
extern VALUE find_breakpoint_by_pos(VALUE breakpoints, VALUE source, VALUE pos,
                                    VALUE binding);
extern VALUE find_breakpoint_by_method(VALUE breakpoints, VALUE klass,
                                       VALUE mid, VALUE binding, VALUE self);
extern void Init_breakpoint(VALUE mByebug);

#endif