#ifndef SEMA_H
#define SEMA_H

#include "ast.h"
#include "collection.h"
#include <stddef.h>
#include <stdio.h>

typedef enum {
    Type_None,
    Type_Int,
    Type_Char,
    Type_Float,
    Type_Double,
    Type_Bool,
    Type_Void,
    Type_Pointer,
    Type_Function,
} TypeTy;

typedef enum {
    TypeSpec_Const = 1 << 0,
    TypeSpec_Short = 1 << 1,
    TypeSpec_Long = 1 << 2,
    TypeSpec_Long2 = 1 << 3,
    TypeSpec_Unsigned = 1 << 4,
} TypeSpec;

typedef struct Type Type;

struct Type {
    TypeTy ty;
    TypeSpec spec;
    union {
        struct {
            Type* inner;
            TypeSpec spec;
        } pointer;
        struct {
            Type* return_type;
            ARRAY_FIELD(Type*, params);
        } function;
    };
};

void type_print(FILE* file, const Type* type);

typedef enum {
    Sym_Declar,
    Sym_Param,
} SymTy;

typedef struct {
    SymTy ty;
    union {
        struct {
            Type* type;
        } declar;
        struct {
            Type* type;
            size_t idx;
        } param;
    };
} Sym;

typedef struct {
    int _;
} LabelSym;

typedef struct Sema Sema;

Sema* sema_new(void);
void sema_free(Sema* s);

void sema_scope_enter(Sema* s);
void sema_scope_leave(Sema* s);

void sema_function_enter(Sema* s, AstSpec spec, AstDeclar* declar);
void sema_function_leave(Sema* s);

void sema_visit_stmt(Sema* s, AstStmt* stmt);
void sema_visit_expr(Sema* s, AstExpr* expr);

#endif