#ifndef INCLUDED_AST_H
#define INCLUDED_AST_H

#include "parse.h"

#include <stddef.h>
#include <stdint.h>

typedef enum {
    AST_TYPE_LIST,
    AST_TYPE_SYMBOL,
    AST_TYPE_VECTOR,
    AST_TYPE_INT,
    AST_TYPE_FLOAT,
    AST_TYPE_STRING,
    AST_TYPE_QUOTE,
    AST_TYPE_NULL,
} AstType;

typedef struct {
    AstType type;
    size_t line;
    size_t col;
} AstNode;

typedef struct {
    AstNode parent;
    size_t nchildren;
    AstNode **children;
} AstListNode;

typedef struct {
    AstNode parent;
    size_t nchildren;
    AstNode **children;
} AstVectorNode;

typedef struct {
    AstNode parent;
    int64_t value;
} AstIntNode;

typedef struct {
    AstNode parent; 
    double value;
} AstFloatNode;

typedef struct {
    AstNode parent;
    char *value;
    size_t length;
} AstStringNode;

typedef struct {
    AstNode parent;
    bool is_property;
    char *name;
    size_t name_length;
    bool skip_free;
} AstSymbolNode;

typedef enum {
    AST_QUOTE_NONE = 0,
    AST_QUOTE_COMMA,
    AST_QUOTE_SPLICE,
    AST_QUOTE_NORM,
    AST_QUOTE_BACK,
} AstQuoteType;

typedef struct {
    AstNode parent;
    AstQuoteType type;
    AstNode *form;
} AstQuoteNode;

typedef enum {
    AST_ERROR_PARSE,
    AST_ERROR_BUILD
} AstErrorType;

typedef struct _AstErrorList {
    struct _AstErrorList *next;
    AstErrorType type;
    union {
        ParseError *parse;
        struct {
            Token token;
            size_t off; // from start of token
            char *msg;
        } build;
    };
} AstErrorList;

void ast_init_parser(void);
void ast_deinit_parser(void);

AstNode *ast_next_toplevel(TokenStream *stream, AstErrorList **err);

void destroy_ast_node(void *node);

AstErrorList *ast_error_list_pop(AstErrorList **list);
void ast_error_list_free_one(AstErrorList *list);
void ast_error_list_free_all(AstErrorList *list);

char *ast_escape_string(const char *input, size_t input_len, size_t *out_len);
void ast_prin1_node(AstNode *node, FILE *stream);
char *ast_prin1_node_to_string(AstNode *node, size_t *out_len);
void ast_format_error(AstErrorList *err, const char *file_name, FILE *stream);

#endif