/*
* Copyright (C) 2023 Johnny Richard
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef AST_H
#define AST_H
#include <stdint.h>
#include "string_view.h"

#define ast_visitor_visit(visitor, node) ast_node_accept_visitor(node, (ast_visitor_t *) visitor);

typedef enum {
  TYPE_I32
} type_t;

typedef struct ast_visitor_t ast_visitor_t;
typedef struct ast_node_t ast_node_t;

typedef struct ast_return_stmt_t {
  uint32_t number;
} ast_return_stmt_t;

typedef struct ast_function_declaration_t {
  string_view_t name;
  type_t  return_type;
  ast_node_t* body;
} ast_function_declaration_t;

typedef struct ast_visitor_t {
  void (*visit_function)(struct ast_visitor_t *, ast_function_declaration_t *);
  void (*visit_return_stmt)(struct ast_visitor_t *, ast_return_stmt_t *);
} ast_visitor_t;

typedef enum {
  AST_UNKOWN_NODE,
  AST_FUNCTION_DECLARATION,
  AST_RETURN_STMT
} ast_node_kind_t;

typedef union {
  ast_function_declaration_t function;
  ast_return_stmt_t return_stmt;
} ast_node_data_t;

typedef struct ast_node_t {
  void (*accept_visitor)(ast_node_t *, ast_visitor_t *);
  ast_node_kind_t kind;
  ast_node_data_t data;
} ast_node_t;

void ast_node_accept_visitor(ast_node_t *node, ast_visitor_t *visitor);

ast_node_t* ast_node_new();
void ast_node_destroy(ast_node_t *node);

void ast_node_init_function_declaration(ast_node_t* node, string_view_t name, type_t return_type, ast_node_t *body);
void ast_node_init_return_stmt(ast_node_t* node, uint32_t number);

#endif /* AST_H */