#ifndef AMALGAM_AST_H
#define AMALGAM_AST_H

#include "defs.h"
#include "std/buffer_view.h"
#include "std/buffer.h"
#include "std/misc.h"
#include "std/scoped_allocator.h"
#include "std/hash_map.h"
#include "binop_type.h"

#include <setjmp.h>

/* General error */
#define AST_ERR -1
#define AST_ERR_DEF_DUP -20

typedef struct FunctionDecl FunctionDecl;
typedef struct FunctionCall FunctionCall;
typedef struct LhsExpr LhsExpr;
typedef struct Import Import;
typedef struct String String;
typedef struct Variable Variable;
typedef struct Number Number;
typedef struct Binop Binop;

typedef union {
    void *data;
    FunctionDecl *func_decl;
    FunctionCall *func_call;
    LhsExpr *lhs_expr;
    Import *import;
    String *string;
    Number *number;
    Variable *variable;
    Binop *binop;
} AstValue;

typedef enum {
    AST_NONE,
    AST_FUNCTION_DECL,
    AST_FUNCTION_CALL,
    AST_LHS,
    AST_IMPORT,
    AST_STRING,
    AST_NUMBER,
    AST_VARIABLE,
    AST_BINOP
} AstType;

typedef enum {
    AST_NOT_RESOLVED,
    AST_RESOLVING,
    AST_RESOLVED
} AstResolveStatus;

typedef struct {
    AstValue value;
    AstType type;
    AstResolveStatus resolve_status;
} Ast;

struct Scope {
    Buffer ast_objects;
    HashMap/*(key=BufferView, value=Ast)*/ named_objects;
};

struct FunctionDecl {
    Scope body;
};

struct FunctionCall {
    BufferView name;
    Buffer/*Ast*/ args;
};

struct LhsExpr {
    int is_const;
    BufferView type_name;
    BufferView var_name;
    Ast rhs_expr;
};

struct Import {
    BufferView path;
};

struct String {
    BufferView str;
};

struct Number {
    union {
        i64 integer;
        f64 floating;
    } value;
    bool is_integer;
};

struct Variable {
    BufferView name;
    Ast resolved_variable;
};

struct Binop {
    Ast lhs;
    Ast rhs;
    BinopType type;
    /* Is the binop already ordered - no need to reorder it */
    bool grouped;
};

typedef struct {
    jmp_buf env;
    Parser *parser;
} AstCompilerContext;

Ast ast_none();
void ast_init(Ast *self, void *value, AstType type);
BufferView ast_get_name(Ast *self);

CHECK_RESULT int funcdecl_init(FunctionDecl *self, ScopedAllocator *allocator);
CHECK_RESULT int funccall_init(FunctionCall *self, BufferView name, ScopedAllocator *allocator);
void lhsexpr_init(LhsExpr *self, int isConst, BufferView var_name);
void import_init(Import *self, BufferView path);
CHECK_RESULT int string_init(String *self, BufferView str);
void number_init(Number *self, i64 value, bool is_integer);
void variable_init(Variable *self, BufferView name);
void binop_init(Binop *self);

CHECK_RESULT int scope_init(Scope *self, ScopedAllocator *allocator);
CHECK_RESULT int scope_add_child(Scope *self, Ast *child);
/* longjump to compiler env on failure */
void scope_resolve(Scope *self, AstCompilerContext *context);

#endif