/*
  @! Separate out the codegen stage cause that can change
  @! Change type of Stage allocator 
  @! Look into stage allocator and perhaps 
    use it more often to reduce scenarios
    with 2 allocators, and simplify stuff
  @! Cleanup big int allocator
  @! Replace iterator interface

  @! Clean way to free all memory and reset the compiler
  @! Bring the Table<>
  @! Look into List, check if that's neccessary

  @! Compute time statistics inside context and expose them properly
 
  Probably want to implement a Red Black Tree then
  probably I wouldn't need any sort of heap based
  data structure.
  */

struct Lex_Stream{
  String stream;
  S64    iter;

  U8            *line_begin;
  Intern_String  file;
  S32            line;
  S32            inside_brace_paren;
  Array<Token *> indent_stack; // @scratch_allocated
};

struct Core_Ctx{
  Allocator *heap;
  Push_Arena perm_push_only;
  Push_Arena *perm; // Stores: AST, tokens, interns
  Scratch_Arena *scratch;
  Scratch_Arena *stage_arena;

  // Lexer stuff
  Lex_Stream   stream;
  Array<Token> tokens;
  Intern_Table interns;
  S64 token_iter;
  U32 token_debug_ids;

  // Types
  List<Ast_Type *> all_types;
  S32 type_ids;
  int lambda_ids;
  U64 unique_ids; // @Debug
  Map type_map;

  Ast_Module *language_base_module;

  List<Ast_File    *> files;
  List<Ast_Module  *> modules;
  List<Ast_Decl    *> ordered_decls;
  S32 base_language_ordered_decl_len;

  Ast_Scope         *currently_parsed_scope;
  Ast_File          *currently_parsed_file;
  U32 scope_ids;
  U32 scope_visit_id;

  List<String> module_folders;
  String module_folder;
  String exe_folder;
  String working_folder;
  List<Token *> files_to_link;

  String_Builder helper_builder;

  F64 generating_time_begin;
  F64 generating_time_end;
  F64 resolving_time_begin;
  F64 resolving_time_end;
  F64 total_time;
  F64 init_ctx_time_begin;
  F64 init_ctx_time_end;
  F64 parsing_time_begin;
  F64 parsing_time_end;

  bool color_codes_enabled;

  // Codegen stage mostly
  S64 indent;
  String_Builder gen;

  // Codegen stage configurables
  bool emit_line_directives;
  bool emit_type_info;
  String symbol_prefix;
  bool single_header_library_mode;
  String single_header_library_name;

  Token same_scope_token;
  Token null_token;
  /*#import meta
    for i in meta.keywords: print(f'Intern_String keyword_{i.lower()};')
    for i in meta.interns: print(f'Intern_String intern_{i.lower()};')

    */
  Intern_String keyword_struct;
  Intern_String keyword_union;
  Intern_String keyword_true;
  Intern_String keyword_default;
  Intern_String keyword_break;
  Intern_String keyword_false;
  Intern_String keyword_return;
  Intern_String keyword_switch;
  Intern_String keyword_assert;
  Intern_String keyword_if;
  Intern_String keyword_elif;
  Intern_String keyword_pass;
  Intern_String keyword_else;
  Intern_String keyword_for;
  Intern_String keyword_enum;
  Intern_String intern_typeof;
  Intern_String intern_sizeof;
  Intern_String intern_len;
  Intern_String intern_alignof;
  Intern_String intern_foreign;
  Intern_String intern_strict;
  Intern_String intern_void;
  Intern_String intern_flag;
  Intern_String intern_it;
  Intern_String intern_load;
  Intern_String intern_import;
  Intern_String intern_link;
  /*END*/

  Intern_String intern(String string){
    assert(string.len > 0);
    return intern_string(&interns, string);
  }
};

CORE_Static void init_type();
CORE_Static String compile_to_c_code();
CORE_Static Ast_Module *ast_module(Token *pos, Intern_String filename);
CORE_Static void insert_builtin_types_into_scope(Ast_Scope *p);
CORE_Static void insert_into_scope(Ast_Scope *scope, Ast_Decl *decl);
CORE_Static Ast_Type *type_incomplete(Ast *ast);
CORE_Static Ast_Expr *parse_expr(S64 minbp = 0);