#include "scope.h"
#include <vector>
#include "heap.h"

struct t_variable {
	//char	name[MAX_IDENTIFIER_LENGTH];
    std::string name;
	int		    type;
	int 	    length;
	int 	    address;
};

struct t_struct {
	//char		name[MAX_IDENTIFIER_LENGTH];
    std::string             name;
	std::vector<t_variable> members;
};

struct t_scope {
    std::vector<t_variable> variables;
    t_scope*                parent_scope;
};

static t_scope scope_global;
static t_scope* scope_current = &scope_global; 

void scope_init() {
    scope_current = &scope_global;
    scope_global.variables.clear();
}

void scope_open_local() {
    t_scope* new_scope = new t_scope;
    new_scope->parent_scope = scope_current;
    scope_current = new_scope;
}

void scope_close_local() {
    t_scope* closing_scope = scope_current;
    scope_current = scope_current->parent_scope;
    delete closing_scope;
}

const int scope_declare_variable(const std::string name, const int type, const int length) {
    for (t_variable v : scope_current->variables) { if (v.name == name) return -1; }
    const int address = heap_get_address();
    const t_variable var {name, type, length, address};
    scope_current->variables.push_back(var);
    return address;
}