/*
Builder for the 4coder_string.h header.
By Allen Webster
Created 21.01.2017 (dd.mm.yyyy)
*/

// TOP

#include "../4cpp/4cpp_lexer.h"
// TODO(allen): Make sure to only publish the 4coder_string.h if it builds and passes a series of tests.
#define FSTRING_IMPLEMENTATION
#include "../4coder_lib/4coder_string.h"

#include "../4tech_defines.h"
#include "../meta/4tech_meta_defines.h"
#include "../meta/4tech_file_moving.h"


#define BUILD_NUMBER_FILE "4coder_string_build_num.txt"

#define GENERATED_FILE "4coder_string.h"
#define INTERNAL_STRING "internal_4coder_string.cpp"

#define BACKUP_FOLDER ".." SLASH ".." SLASH "string_backup"
#define PUBLISH_FOLDER ".." SLASH "4coder_helper"


#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "../4coder_lib/4coder_mem.h"

#define V_MAJ_NUM 1
#define V_MIN_NUM 0

#define V_MAJ STR_(V_MAJ_NUM)
#define V_MIN STR_(V_MIN_NUM)

#include "../meta/meta_parser.cpp"

static b32
parse_build_number(char *file_name, i32 *major_out, i32 *minor_out, i32 *build_out){
    b32 result = false;
    String file = file_dump(file_name);
    
    if (file.str != 0){
        char *end_str = file.str + file.size;
        char *major_str = file.str;
        char *minor_str = major_str;
        for (; minor_str < end_str && *minor_str != '\n'; ++minor_str);
        ++minor_str;
        
        *major_out = 0;
        *minor_out = 0;
        *build_out = 0;
        
        if (major_str < end_str){
            char *build_str = minor_str;
            for (; build_str < end_str && *build_str != '\n'; ++build_str);
            ++build_str;
            
            if (build_str < end_str){
                char *ender = build_str;
                for (; ender < end_str && *ender != '\n'; ++ender);
                
                if (ender < end_str){
                    *ender = 0;
                }
                
                minor_str[-1] = 0;
                build_str[-1] = 0;
                
                *major_out = str_to_int_c(major_str);
                *minor_out = str_to_int_c(minor_str);
                *build_out = str_to_int_c(build_str);
                
                result = true;
            }
        }
        
        free(file.str);
    }
    
    return(result);
}

static void
save_build_number(char *file_name, i32 major, i32 minor, i32 build){
    FILE *out = fopen(file_name, "wb");
    fprintf(out, "%d\n", major);
    fprintf(out, "%d\n", minor);
    fprintf(out, "%d\n\n\n", build);
    fclose(out);
}

///////////////////////////////

#include "../meta/out_context.cpp"

//
// Meta Parse Rules
//

static void
print_function_body_code(String *out, Parse_Context *context, int32_t start){
    String pstr = {0}, lexeme = {0};
    Cpp_Token *token = 0;
    
    int32_t do_print = 0;
    int32_t nest_level = 0;
    int32_t finish = false;
    int32_t do_whitespace_print = false;
    int32_t is_first = true;
    
    for (; (token = get_token(context)) != 0; get_next_token(context)){
        if (do_whitespace_print){
            pstr = str_start_end(context->data, start, token->start);
            append_ss(out, pstr);
        }
        else{
            do_whitespace_print = true;
        }
        
        do_print = true;
        if (token->type == CPP_TOKEN_COMMENT){
            lexeme = get_lexeme(*token, context->data);
            if (check_and_fix_docs(&lexeme)){
                do_print = false;
            }
        }
        else if (token->type == CPP_TOKEN_BRACE_OPEN){
            ++nest_level;
        }
        else if (token->type == CPP_TOKEN_BRACE_CLOSE){
            --nest_level;
            if (nest_level == 0){
                finish = true;
            }
        }
        if (is_first){
            do_print = false;
            is_first = false;
        }
        
        if (do_print){
            pstr = get_lexeme(*token, context->data);
            append_ss(out, pstr);
        }
        
        start = token->start + token->size;
        
        if (finish){
            break;
        }
    }
}

internal void
file_move(char *path, char *file_name){
    copy_file(0, file_name, path, 0, file_name);
}

int main(){
    META_BEGIN();
    
    i32 size = (512 << 20);
    void *mem = malloc(size);
    memset(mem, 0, size);
    
    Partition part_ = make_part(mem, size);
    Partition *part = &part_;
    
    static Meta_Keywords meta_keywords[] = {
        {make_lit_string("API_EXPORT")        , Item_Function } ,
        {make_lit_string("API_EXPORT_INLINE") , Item_Function } ,
        {make_lit_string("API_EXPORT_MACRO")  , Item_Macro    } ,
        {make_lit_string("CPP_NAME")          , Item_CppName  } ,
        {make_lit_string("TYPEDEF") , Item_Typedef } ,
        {make_lit_string("STRUCT")  , Item_Struct  } ,
        {make_lit_string("UNION")   , Item_Union   } ,
        {make_lit_string("ENUM")    , Item_Enum    } ,
    };
    
    // NOTE(allen): Parse the internal string file.
    char *string_files[] = { INTERNAL_STRING, 0 };
    Meta_Unit string_unit = compile_meta_unit(part, ".", string_files, ExpandArray(meta_keywords));
    
    if (string_unit.parse == 0){
        Assert(!"Missing one or more input files!");
    }
    
    // NOTE(allen): Parse the version counter file
    i32 major_number = 0;
    i32 minor_number = 0;
    i32 build_number = 0;
    b32 parsed_version_counter = parse_build_number(BUILD_NUMBER_FILE, &major_number, &minor_number, &build_number);
    Assert(parsed_version_counter);
    
    if (V_MAJ_NUM < major_number){
        Assert(!"major version mismatch");
    }
    else if (V_MAJ_NUM > major_number){
        major_number = V_MAJ_NUM;
        minor_number = V_MIN_NUM;
        build_number = 0;
    }
    else{
        if (V_MIN_NUM < minor_number){
            Assert(!"minor version mismatch");
        }
        else if (V_MIN_NUM > minor_number){
            minor_number = V_MIN_NUM;
            build_number = 0;
        }
    }
    
    // NOTE(allen): Output
    String out = str_alloc(part, 10 << 20);
    Out_Context context = {0};
    
    // NOTE(allen): String Library
    if (begin_file_out(&context, GENERATED_FILE, &out)){
        Cpp_Token *token = 0;
        int32_t start = 0;
        
        Parse parse = string_unit.parse[0];
        Parse_Context pcontext = setup_parse_context(parse);
        
        for (; (token = get_token(&pcontext)) != 0; get_next_token(&pcontext)){
            if (!(token->flags & CPP_TFLAG_PP_BODY) &&
                token->type == CPP_TOKEN_IDENTIFIER){
                String lexeme = get_lexeme(*token, pcontext.data);
                if (match_ss(lexeme, make_lit_string("FSTRING_BEGIN"))){
                    start = token->start + token->size;
                    break;
                }
            }
        }
        
        append_sc(&out, "/*\n");
        
        append_sc(&out, GENERATED_FILE " - Version "V_MAJ"."V_MIN".");
        append_int_to_str(&out, build_number);
        append_sc(&out, "\n");
        
        append_sc(&out, STANDARD_DISCLAIMER);
        append_sc(&out,
                  "To include implementation: #define FSTRING_IMPLEMENTATION\n"
                  "To use in C mode: #define FSTRING_C\n");
        
        append_sc(&out, "*/\n");
        
        String pstr = {0};
        int32_t do_whitespace_print = true;
        
        for(;(token = get_next_token(&pcontext)) != 0;){
            if (do_whitespace_print){
                pstr = str_start_end(pcontext.data, start, token->start);
                append_ss(&out, pstr);
            }
            else{
                do_whitespace_print = true;
            }
            
            String lexeme = get_lexeme(*token, pcontext.data);
            
            int32_t do_print = true;
            if (match_ss(lexeme, make_lit_string("FSTRING_DECLS"))){
                append_sc(&out, "#if !defined(FCODER_STRING_H)\n#define FCODER_STRING_H\n\n");
                do_print = false;
                
                static int32_t RETURN_PADDING = 16;
                static int32_t SIG_PADDING = 35;
                
                for (int32_t j = 0; j < string_unit.set.count; ++j){
                    char line_[2048];
                    String line = make_fixed_width_string(line_);
                    Item_Node *item = string_unit.set.items + j;
                    
                    if (item->t == Item_Function){
                        //append_ss       (&line, item->marker);
                        //append_padding  (&line, ' ', RETURN_PADDING);
                        append_ss       (&line, item->ret);
                        append_padding  (&line, ' ', SIG_PADDING);
                        append_ss       (&line, item->name);
                        append_ss       (&line, item->args);
                        append_sc       (&line, ";\n");
                    }
                    else if (item->t == Item_Macro){
                        append_ss       (&line, make_lit_string("#ifndef "));
                        append_padding  (&line, ' ', 10);
                        append_ss       (&line, item->name);
                        append_s_char   (&line, '\n');
                        
                        append_ss       (&line, make_lit_string("# define "));
                        append_padding  (&line, ' ', 10);
                        append_ss       (&line, item->name);
                        append_ss       (&line, item->args);
                        append_s_char   (&line, ' ');
                        append_ss       (&line, item->body);
                        append_s_char   (&line, '\n');
                        
                        append_ss       (&line, make_lit_string("#endif"));
                        append_s_char   (&line, '\n');
                    }
                    else{
                        InvalidCodePath;
                    }
                    
                    append_ss(&out, line);
                }
                
                append_sc(&out, "\n#endif\n");
                
                // NOTE(allen): C++ overload definitions
                append_sc(&out, "\n#if !defined(FSTRING_C) && !defined(FSTRING_GUARD)\n\n");
                
                for (int32_t j = 0; j < string_unit.set.count; ++j){
                    char line_space[2048];
                    String line = make_fixed_width_string(line_space);
                    
                    Item_Node *item = &string_unit.set.items[j];
                    
                    if (item->t == Item_Function){
                        String cpp_name = item->cpp_name;
                        if (cpp_name.str != 0){
                            Argument_Breakdown breakdown = item->breakdown;
                            
                            append_ss     (&line, item->ret);
                            append_padding(&line, ' ', SIG_PADDING);
                            append_ss     (&line, cpp_name);
                            append_ss     (&line, item->args);
                            if (match_ss(item->ret, make_lit_string("void"))){
                                append_ss(&line, make_lit_string("{("));
                            }
                            else{
                                append_ss(&line, make_lit_string("{return("));
                            }
                            append_ss    (&line, item->name);
                            append_s_char(&line, '(');
                            
                            if (breakdown.count > 0){
                                for (int32_t i = 0; i < breakdown.count; ++i){
                                    if (i != 0){
                                        append_s_char(&line, ',');
                                    }
                                    append_ss(&line, breakdown.args[i].param_name);
                                }
                            }
                            else{
                                append_ss(&line, make_lit_string("void"));
                            }
                            
                            append_ss(&line, make_lit_string("));}\n"));
                            
                            append_ss(&out, line);
                        }
                    }
                }
                
                append_sc(&out, "\n#endif\n");
            }
            
            else if (match_ss(lexeme, make_lit_string("API_EXPORT_MACRO"))){
                token = get_next_token(&pcontext);
                if (token && token->type == CPP_TOKEN_COMMENT){
                    token = get_next_token(&pcontext);
                    if (token && token->type == CPP_PP_DEFINE){
                        for (;(token = get_next_token(&pcontext)) != 0;){
                            if (!(token->flags & CPP_TFLAG_PP_BODY)){
                                break;
                            }
                        }
                        if (token != 0){
                            get_prev_token(&pcontext);
                        }
                        do_print = false;
                        do_whitespace_print = false;
                    }
                }
            }
            
            else if (match_ss(lexeme, make_lit_string("API_EXPORT")) ||
                     match_ss(lexeme, make_lit_string("API_EXPORT_INLINE"))){
                if (!(token->flags & CPP_TFLAG_PP_BODY)){
                    if (match_ss(lexeme, make_lit_string("API_EXPORT_INLINE"))){
                        append_sc(&out, "#if !defined(FSTRING_GUARD)\n");
                    }
                    else{
                        append_sc(&out, "#if defined(FSTRING_IMPLEMENTATION)\n");
                    }
                    print_function_body_code(&out, &pcontext, start);
                    append_sc(&out, "\n#endif");
                    do_print = false;
                }
            }
            
            else if (match_ss(lexeme, make_lit_string("CPP_NAME"))){
                Cpp_Token *token_start = token;
                int32_t has_cpp_name = false;
                
                token = get_next_token(&pcontext);
                if (token && token->type == CPP_TOKEN_PARENTHESE_OPEN){
                    token = get_next_token(&pcontext);
                    if (token && token->type == CPP_TOKEN_IDENTIFIER){
                        token = get_next_token(&pcontext);
                        if (token && token->type == CPP_TOKEN_PARENTHESE_CLOSE){
                            has_cpp_name = true;
                            do_print = false;
                        }
                    }
                }
                
                if (!has_cpp_name){
                    token = set_token(&pcontext, token_start);
                }
            }
            
            else if (token->type == CPP_TOKEN_COMMENT){
                if (check_and_fix_docs(&lexeme)){
                    do_print = false;
                }
            }
            
            else if (token->type == CPP_PP_INCLUDE){
                token = get_next_token(&pcontext);
                
                if (token && token->type == CPP_PP_INCLUDE_FILE){
                    lexeme = get_lexeme(*token, pcontext.data);;
                    lexeme.size -= 2;
                    lexeme.str += 1;
                    
                    char space[512];
                    String str = make_fixed_width_string(space);
                    append_ss(&str, lexeme);
                    terminate_with_null(&str);
                    String dump = file_dump(str.str);
                    if (dump.str){
                        append_ss(&out, dump);
                    }
                    else{
                        lexeme.size += 2;
                        lexeme.str -= 1;
                        append_sc(&out, "#error Could not find ");
                        append_ss(&out, lexeme);
                        append_sc(&out, "\n");
                    }
                    free(dump.str);
                }
                
                do_print = false;
            }
            
            if ((token = get_token(&pcontext)) != 0){
                if (do_print){
                    pstr = get_lexeme(*token, pcontext.data);
                    append_ss(&out, pstr);
                }
                start = token->start + token->size;
            }
        }
        pstr = str_start_end(pcontext.data, start, parse.code.size);
        append_ss(&out, pstr);
        
        end_file_out(context);
    }
    
    // NOTE(allen): Publish the new file.  (Would like to be able to automatically test the result before publishing).
    {
        make_folder_if_missing(BACKUP_FOLDER SLASH V_MAJ SLASH V_MIN, 0);
        file_move(BACKUP_FOLDER SLASH V_MAJ SLASH V_MIN, INTERNAL_STRING);
        file_move(BACKUP_FOLDER SLASH V_MAJ SLASH V_MIN, GENERATED_FILE);
        //file_move(PUBLISH_FOLDER, GENERATED_FILE);
        delete_file(GENERATED_FILE);
        printf("published "GENERATED_FILE": v%d.%d.%d\n", major_number, minor_number, build_number);
        save_build_number(BUILD_NUMBER_FILE, major_number, minor_number, build_number + 1);
    }
    
    META_FINISH();
}

#define FTECH_FILE_MOVING_IMPLEMENTATION
#include "../meta/4tech_file_moving.h"

// BOTTOM