/*
* Mr. 4th Dimention - Allen Webster
*
* 25.02.2016
*
* File editing view for 4coder
*
*/

// TOP

#include "4ed_meta.h"
#define FCPP_STRING_IMPLEMENTATION
#include "4coder_string.h"

#include "4cpp_types.h"
#include "4cpp_lexer_types.h"

#define FCPP_LEXER_IMPLEMENTATION
#include "4cpp_lexer.h"

#include "4coder_version.h"

struct Struct_Field{
    char *type;
    char *name;
};

void to_lower(char *src, char *dst){
    char *c, ch;
    for (c = src; *c != 0; ++c){
        ch = char_to_lower(*c);
        *dst++ = ch;
    }
    *dst = 0;
}

void to_lower(String *str){
    char *c;
    int i = 0;
    int size = str->size;
    for (c = str->str; i < size; ++c, ++i){
        *c = char_to_lower(*c);
    }
}

void to_upper(char *src, char *dst){
    char *c, ch;
    for (c = src; *c != 0; ++c){
        ch = char_to_upper(*c);
        *dst++ = ch;
    }
    *dst = 0;
}

void to_upper(String *str){
    char *c;
    int i = 0;
    int size = str->size;
    for (c = str->str; i < size; ++c, ++i){
        *c = char_to_upper(*c);
    }
}

void to_camel(char *src, char *dst){
    char *c, ch;
    int is_first = 1;
    for (c = src; *c != 0; ++c){
        ch = *c;
        if (char_is_alpha_numeric_true(ch)){
            if (is_first){
                is_first = 0;
                ch = char_to_upper(ch);
            }
            else{
                ch = char_to_lower(ch);
            }
        }
        else{
            is_first = 1;
        }
        *dst++ = ch;
    }
    *dst = 0;
}

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

void struct_begin(FILE *file, char *name){
    fprintf(file, "struct %s{\n", name);
}

void struct_fields(FILE *file, Struct_Field *fields, int count){
    int i;
    for (i = 0; i < count; ++i){
        fprintf(file, "    %s %s;\n", fields[i].type, fields[i].name);
    }
}

void struct_end(FILE *file){
    fprintf(file, "};\n\n");
}


void enum_begin(FILE *file, char *name){
    fprintf(file, "enum %s{\n", name);
}


char *keys_that_need_codes[] = {
    "back",
    "up",
    "down",
    "left",
    "right",
    "del",
    "insert",
    "home",
    "end",
    "page_up",
    "page_down",
    "esc",
    
    "mouse_left",
    "mouse_right",
    
    "f1",
    "f2",
    "f3",
    "f4",
    "f5",
    "f6",
    "f7",
    "f8",
    
    "f9",
    "f10",
    "f11",
    "f12",
    "f13",
    "f14",
    "f15",
    "f16",
};

char* generate_keycode_enum(){
    FILE *file;
    char *filename = "4coder_keycodes.h";
    int i, count;
    unsigned char code = 1;
    
    file = fopen(filename, "wb");
    fprintf(file, "enum Key_Code{\n");
    count = ArrayCount(keys_that_need_codes);
    for (i = 0; i < count; i){
        if (strcmp(keys_that_need_codes[i], "f1") == 0 && code < 0x7F){
            code = 0x7F;
        }
        switch (code){
            case '\n': code++; break;
            case '\t': code++; break;
            case 0x20: code = 0x7F; break;
            default:
            fprintf(file, "key_%s = %d,\n", keys_that_need_codes[i++], code++);
            break;
        }
    }
    fprintf(file, "};\n");
    
    fprintf(file,
            "static char*\n"
            "global_key_name(int key_code, int *size){\n"
            "char *result = 0;\n"
            "switch(key_code){\n"
            );
    for (i = 0; i < count; ++i){
        fprintf(file,
                "case key_%s: result = \"%s\"; *size = sizeof(\"%s\")-1; break;\n",
                keys_that_need_codes[i],
                keys_that_need_codes[i],
                keys_that_need_codes[i]
                );
    }
    fprintf(file,
            "}\n"
            "return(result);\n"
            "}\n"
            );
    
    fclose(file);
    return(filename);
}

//////////////////////////////////////////////////////////////////////////////////////////////////
char* bar_style_fields[] = {
    "bar",
    "bar_active",
    "base",
    "pop1",
    "pop2",
};

char* main_style_fields[] = {
    "back",
    "margin",
    "margin_hover",
    "margin_active",
    "cursor",
    "at_cursor",
    "highlight",
    "at_highlight",
    "mark",
    "default",
    "comment",
    "keyword",
    "str_constant",
    "char_constant",
    "int_constant",
    "float_constant",
    "bool_constant",
    "preproc",
    "include",
    "special_character",
    "highlight_junk",
    "highlight_white",
    "paste",
    "undo",
    "next_undo",
};

static char*
make_style_tag(char *tag){
    char *str;
    int len;
    
    len = (int)strlen(tag);
    str = (char*)malloc(len + 1);
    to_camel(tag, str);
    str[len] = 0;
    
    return(str);
}

char style_index_function_start[] =
"inline u32*\n"
"style_index_by_tag(Style_Main_Data *s, u32 tag){\n"
" u32 *result = 0;\n"
" switch (tag){\n";

char style_index_function_end[] =
" }\n"
" return(result);\n"
"}\n\n";

char style_case[] = " case Stag_%s: result = &s->%s_color; break;\n";
char style_info_case[] = " case Stag_%s: result = &s->file_info_style.%s_color; break;\n";

char* generate_style(){
    char *filename = "4coder_style.h & 4ed_style.h";
    char filename_4coder[] = "4coder_style.h";
    char filename_4ed[] = "4ed_style.h";
    FILE *file;
    char *tag;
    int count, i;
    
    file = fopen(filename_4coder, "wb");
    enum_begin(file, "Style_Tag");
    {
        count = ArrayCount(bar_style_fields);
        for (i = 0; i < count; ++i){
            tag = make_style_tag(bar_style_fields[i]);
            fprintf(file, "Stag_%s,\n", tag);
            free(tag);
        }
        
        count = ArrayCount(main_style_fields);
        for (i = 0; i < count; ++i){
            tag = make_style_tag(main_style_fields[i]);
            fprintf(file, "Stag_%s,\n", tag);
            free(tag);
        }
    }
    struct_end(file);
    fclose(file);
    
    file = fopen(filename_4ed, "wb");
    struct_begin(file, "Interactive_Style");
    {
        count = ArrayCount(bar_style_fields);
        for (i = 0; i < count; ++i){
            fprintf(file, "u32 %s_color;\n", bar_style_fields[i]);
        }
    }
    struct_end(file);
    
    struct_begin(file, "Style_Main_Data");
    {
        count = ArrayCount(main_style_fields);
        for (i = 0; i < count; ++i){
            fprintf(file, "u32 %s_color;\n", main_style_fields[i]);
        }
        fprintf(file, "Interactive_Style file_info_style;\n");
    }
    struct_end(file);
    
    {
        fprintf(file, "%s", style_index_function_start);
        count = ArrayCount(bar_style_fields);
        for (i = 0; i < count; ++i){
            tag = make_style_tag(bar_style_fields[i]);
            fprintf(file, style_info_case, tag, bar_style_fields[i]);
            free(tag);
        }
        
        count = ArrayCount(main_style_fields);
        for (i = 0; i < count; ++i){
            tag = make_style_tag(main_style_fields[i]);
            fprintf(file, style_case, tag, main_style_fields[i]);
            free(tag);
        }
        fprintf(file, "%s", style_index_function_end);
    }
    
    fclose(file);
    
    return(filename);
}

//////////////////////////////////////////////////////////////////////////////////////////////////
typedef struct Argument_Breakdown{
    int count;
    String *param_string;
    String *param_name;
} Argument_Breakdown;

typedef struct Documentation{
    int param_count;
    String *param_name;
    String *param_docs;
    String return_doc;
    String main_doc;
    int see_also_count;
    String *see_also;
} Documentation;

typedef struct Function_Set{
    String *name;
    String *ret;
    String *args;
    
    String *macros;
    String *public_name;
    String *doc_string;
    
    int    *valid;
    
    Argument_Breakdown *breakdown;
    Documentation *doc;
} Function_Set;

void
zero_index(Function_Set fnc_set, int sig_count){
    fnc_set.name [sig_count] = string_zero();
    fnc_set.ret  [sig_count] = string_zero();
    fnc_set.args [sig_count] = string_zero();
    fnc_set.valid[sig_count] = 0;
}

String
file_dump(char *filename){
    String result = {0};
    FILE *file = fopen(filename, "rb");
    
    if (file){
        fseek(file, 0, SEEK_END);
        result.size = ftell(file);
        fseek(file, 0, SEEK_SET);
        
        result.memory_size = result.size + 1;
        result.str = (char*)malloc(result.memory_size);
        
        fread(result.str, 1, result.size, file);
        result.str[result.size] = 0;
        
        fclose(file);
    }
    
    return(result);
}

String
get_first_line(String source){
    String line = {0};
    int pos = find(source, 0, '\n');
    
    line = substr(source, 0, pos);
    
    return(line);
}

String
get_next_line(String source, String line){
    String next = {0};
    int pos = (int)(line.str - source.str) + line.size;
    int start = 0;
    
    if (pos < source.size){
        assert(source.str[pos] == '\n');
        start = pos + 1;
        
        if (start < source.size){
            pos = find(source, start, '\n');
            next = substr(source, start, pos - start);
        }
    }
    
    return(next);
}

int
is_comment(String str){
    int result = 0;
    if (str.size >= 2){
        if (str.str[0] == '/' &&
            str.str[1] == '/'){
            result = 1;
        }
    }
    return(result);
}

struct Parse{
    Cpp_Token_Stack tokens;
};

int
check_and_fix_docs(String *lexeme){
    int result = false;
    
    if (lexeme->size > 4){
        if (lexeme->str[0] == '/'){
            if (lexeme->str[1] == '*'){
                if (lexeme->str[lexeme->size - 2] == '*'){
                    if (lexeme->str[lexeme->size - 1] == '/'){
                        result = true;
                        lexeme->str += 2;
                        lexeme->size -= 4;
                    }
                }
            }
        }
    }
    
    return(result);
}

enum Doc_Note_Type{
    DOC_PARAM,
    DOC_RETURN,
    DOC,
    DOC_SEE
};

static String
doc_note_string[] = {
    make_lit_string("DOC_PARAM"),
    make_lit_string("DOC_RETURN"),
    make_lit_string("DOC"),
    make_lit_string("DOC_SEE"),
};

String
doc_parse_note(String source, int *pos){
    String result = {0};
    
    int p = *pos;
    int start = p;
    for (; p < source.size; ++p){
        if (source.str[p] == '('){
            break;
        }
    }
    if (p != source.size){
        result = make_string(source.str + start, p - start);
        result = skip_chop_whitespace(result);
    }
    *pos = p;
    
    return(result);
}

String
doc_parse_note_string(String source, int *pos){
    String result = {0};
    
    assert(source.str[*pos] == '(');
    
    int p = *pos + 1;
    int start = p;
    
    int nest_level = 0;
    
    for (; p < source.size; ++p){
        if (source.str[p] == ')'){
            if (nest_level == 0){
                break;
            }
            else{
                --nest_level;
            }
        }
        else if (source.str[p] == '('){
            ++nest_level;
        }
    }
    if (p != source.size){
        result = make_string(source.str + start, p - start);
        result = skip_chop_whitespace(result);
        ++p;
    }
    *pos = p;
    
    return(result);
}

String
doc_parse_parameter(String source, int *pos){
    String result = {0};
    
    int p = *pos;
    int start = p;
    
    for (; p < source.size; ++p){
        if (source.str[p] == ','){
            break;
        }
    }
    if (p != source.size){
        result = make_string(source.str + start, p - start);
        result = skip_chop_whitespace(result);
        ++p;
    }
    *pos = p;
    
    return(result);
}

String
doc_parse_last_parameter(String source, int *pos){
    String result = {0};
    
    int p = *pos;
    int start = p;
    
    for (; p < source.size; ++p){
        if (source.str[p] == ')'){
            break;
        }
    }
    if (p == source.size){
        result = make_string(source.str + start, p - start);
        result = skip_chop_whitespace(result);
    }
    *pos = p;
    
    return(result);    
}

void
perform_doc_parse(String doc_string, Documentation *doc){
    int keep_parsing = true;
    int pos = 0;
    
    int param_count = 0;
    int see_count = 0;
    
    do{
        String doc_note = doc_parse_note(doc_string, &pos);
        if (doc_note.size == 0){
            keep_parsing = false;
        }
        else{
            int doc_note_type;
            if (string_set_match(doc_note_string, ArrayCount(doc_note_string), doc_note, &doc_note_type)){
                
                doc_parse_note_string(doc_string, &pos);
                
                switch (doc_note_type){
                    case DOC_PARAM:
                    ++param_count;
                    break;
                    
                    case DOC_SEE:
                    ++see_count;
                    break;
                }
            }
        }
    }while(keep_parsing);
    
    if (param_count + see_count > 0){
        int memory_size = sizeof(String)*(2*param_count + see_count);
        doc->param_name = (String*)malloc(memory_size);
        doc->param_docs = doc->param_name + param_count;
        doc->see_also   = doc->param_docs + param_count;
        
        doc->param_count = param_count;
        doc->see_also_count = see_count;
    }
    
    int param_index = 0;
    int see_index = 0;
    
    keep_parsing = true;
    pos = 0;
    do{
        String doc_note = doc_parse_note(doc_string, &pos);
        if (doc_note.size == 0){
            keep_parsing = false;
        }
        else{
            int doc_note_type;
            if (string_set_match(doc_note_string, ArrayCount(doc_note_string), doc_note, &doc_note_type)){
                
                String doc_note_string = doc_parse_note_string(doc_string, &pos);
                
                switch (doc_note_type){
                    case DOC_PARAM:
                    {
                        assert(param_index < param_count);
                        int param_pos = 0;
                        String param_name = doc_parse_parameter(doc_note_string, &param_pos);
                        String param_docs = doc_parse_last_parameter(doc_note_string, &param_pos);
                        doc->param_name[param_index] = param_name;
                        doc->param_docs[param_index] = param_docs;
                        ++param_index;
                    }break;
                    
                    case DOC_RETURN:
                    {
                        doc->return_doc = doc_note_string;
                    }break;
                    
                    case DOC:
                    {
                        doc->main_doc = doc_note_string;
                    }break;
                    
                    case DOC_SEE:
                    {
                        assert(see_index < see_count);
                        doc->see_also[see_index++] = doc_note_string;
                    }break;
                }
            }
            else{
                fprintf(stderr, "warning: invalid doc note %.*s\n", doc_note.size, doc_note.str);
            }
        }
    }while(keep_parsing);
}

char*
generate_custom_headers(){
#define API_H "4coder_custom_api.h"
#define API_DOC "4coder_API.html"
    
    char *filename = API_H " & " API_DOC;
    
    Function_Set function_set = {0};
    
    // NOTE(allen): Documentation
    String code_data[2];
    code_data[0] = file_dump("4ed_api_implementation.cpp");
    code_data[1] = file_dump("win32_api_impl.cpp");
    Parse parses[2];
    
    int max_name_size = 0;
    int line_count = 0;
    
    for (int J = 0; J < 2; ++J){
        String *code = &code_data[J];
        Parse *parse = &parses[J];
        
        // TODO(allen): KILL THIS FUCKIN' Cpp_File FUCKIN' NONSENSE HORSE SHIT!!!!!
        Cpp_File file;
        file.data = code->str;
        file.size = code->size;
        
        parse->tokens = cpp_make_token_stack(512);
        cpp_lex_file(file, &parse->tokens);
        
        int count = parse->tokens.count;
        Cpp_Token *tokens = parse->tokens.tokens;
        
        Cpp_Token *token = tokens;
        
        for (int i = 0; i < count; ++i, ++token){
            if (token->type == CPP_TOKEN_IDENTIFIER &&
                !(token->flags & CPP_TFLAG_PP_BODY)){
                String lexeme = make_string(file.data + token->start, token->size);
                if (match(lexeme, "API_EXPORT")){
                    for (; i < count; ++i, ++token){
                        if (token->type == CPP_TOKEN_PARENTHESE_OPEN){
                            break;
                        }
                    }
                    
                    if (i < count){
                        --i;
                        --token;
                        
                        if (token->type == CPP_TOKEN_IDENTIFIER){
                            ++line_count;
                            
                            if (max_name_size < token->size){
                                max_name_size = token->size;
                            }
                        }
                    }
                }
            }
        }
    }
    
    int memory_size = (sizeof(String)*6 + sizeof(int) + sizeof(Argument_Breakdown) + sizeof(Documentation))*line_count;
    
    function_set.name        = (String*)malloc(memory_size);
    function_set.ret         = function_set.name + line_count;
    function_set.args        = function_set.ret + line_count;
    function_set.macros      = function_set.args + line_count;
    function_set.public_name = function_set.macros + line_count;
    function_set.doc_string  = function_set.public_name + line_count;
    function_set.valid       = (int*)(function_set.doc_string + line_count);
    function_set.breakdown   = (Argument_Breakdown*)(function_set.valid + line_count);
    function_set.doc         = (Documentation*)(function_set.breakdown + line_count);
    
    memset(function_set.name, 0, memory_size);
    
    int sig_count = 0;
    for (int J = 0; J < 2; ++J){
        String *code = &code_data[J];
        Parse *parse = &parses[J];
        
        // TODO(allen): KILL THIS FUCKIN' Cpp_File FUCKIN' NONSENSE HORSE SHIT!!!!!
        Cpp_File file;
        file.data = code->str;
        file.size = code->size;
        
        int count = parse->tokens.count;
        Cpp_Token *tokens = parse->tokens.tokens;
        
        Cpp_Token *token = 0;
        
        // NOTE(allen): Header Parse
        token = tokens;
        for (int i = 0; i < count; ++i, ++token){
            if (token->type == CPP_TOKEN_IDENTIFIER &&
                !(token->flags & CPP_TFLAG_PP_BODY)){
                String lexeme = make_string(file.data + token->start, token->size);
                if (match(lexeme, "API_EXPORT")){
                    ++i;
                    ++token;
                    if (i < count){
                        Cpp_Token *ret_start_token = token;
                        
                        for (; i < count; ++i, ++token){
                            if (token->type == CPP_TOKEN_PARENTHESE_OPEN){
                                break;
                            }
                        }
                        
                        Cpp_Token *args_start_token = token;
                        
                        if (i < count){
                            --i;
                            --token;
                            
                            function_set.name[sig_count] = make_string(file.data + token->start, token->size);
                            
                            int size = token->start - ret_start_token->start;
                            String ret = make_string(file.data + ret_start_token->start, size);
                            ret = chop_whitespace(ret);
                            function_set.ret[sig_count] = ret;
                            
                            for (; i < count; ++i, ++token){
                                if (token->type == CPP_TOKEN_PARENTHESE_CLOSE){
                                    break;
                                }
                            }
                            
                            if (i < count){
                                int size = token->start + token->size - args_start_token->start;;
                                function_set.args[sig_count] =
                                    make_string(file.data + args_start_token->start, size);
                                function_set.valid[sig_count] = true;
                                
                                int arg_count = 1;
                                Cpp_Token *arg_token = args_start_token;
                                for (; arg_token < token; ++arg_token){
                                    if (arg_token->type == CPP_TOKEN_COMMA){
                                        ++arg_count;
                                    }
                                }
                                
                                Argument_Breakdown *breakdown = &function_set.breakdown[sig_count];
                                breakdown->count = arg_count;
                                
                                int memory_size = (sizeof(String)*2)*arg_count;
                                
                                breakdown->param_string = (String*)malloc(memory_size);
                                breakdown->param_name = breakdown->param_string + arg_count;
                                
                                memset(breakdown->param_string, 0, memory_size);
                                
                                int arg_index = 0;
                                arg_token = args_start_token + 1;
                                int param_string_start = arg_token->start;
                                
                                for (; arg_token <= token; ++arg_token){
                                    if (arg_token->type == CPP_TOKEN_COMMA ||
                                        arg_token->type == CPP_TOKEN_PARENTHESE_CLOSE){
                                        
                                        int size = arg_token->start - param_string_start;
                                        String param_string = make_string(file.data + param_string_start, size);
                                        param_string = chop_whitespace(param_string);
                                        breakdown->param_string[arg_index] = param_string;
                                        
                                        for (Cpp_Token *param_name_token = arg_token - 1;
                                             param_name_token->start > param_string_start;
                                             --param_name_token){
                                            if (param_name_token->type == CPP_TOKEN_IDENTIFIER){
                                                int start = param_name_token->start;
                                                int size = param_name_token->size;
                                                breakdown->param_name[arg_index] = make_string(file.data + start, size);
                                                break;
                                            }
                                        }
                                        
                                        ++arg_index;
                                        
                                        ++arg_token;
                                        if (arg_token <= token){
                                            param_string_start = arg_token->start;
                                        }
                                        --arg_token;
                                    }
                                }
                            }
                        }
                    }
                    
                    if (!function_set.valid[sig_count]){
                        function_set.ret[sig_count] = string_zero();
                        function_set.name[sig_count] = string_zero();
                        function_set.args[sig_count] = string_zero();
                        // TODO(allen): get warning line numbers
                        fprintf(stderr, "custom_api_spec.cpp(???) : generator warning : invalid function signature\n");
                    }
                    ++sig_count;
                }
            }
        }
        
        // NOTE(allen): Documentation Parse
        token = tokens;
        for (int i = 0; i < count; ++i, ++token){
            if (token->type == CPP_TOKEN_IDENTIFIER &&
                !(token->flags & CPP_TFLAG_PP_BODY)){
                String lexeme = make_string(file.data + token->start, token->size);
                if (match(lexeme, "API_EXPORT")){
                    for (; i < count; ++i, ++token){
                        if (token->type == CPP_TOKEN_PARENTHESE_OPEN){
                            break;
                        }
                    }
                    
                    if (i < count){
                        --i;
                        --token;
                        
                        if (token->type == CPP_TOKEN_IDENTIFIER){
                            lexeme = make_string(file.data + token->start, token->size);
                            int match = 0;
                            if (string_set_match(function_set.name, sig_count, lexeme, &match)){
                                for (; i < count; ++i, ++token){
                                    if (token->type == CPP_TOKEN_COMMENT){
                                        lexeme = make_string(file.data + token->start, token->size);
                                        if (check_and_fix_docs(&lexeme)){
                                            function_set.doc_string[match] = lexeme;
                                            perform_doc_parse(lexeme, &function_set.doc[match]);
                                            break;
                                        }
                                    }
                                    else if (token->type == CPP_TOKEN_BRACE_OPEN){
                                        break;
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
    
    for (int i = 0; i < sig_count; ++i){
        String name_string = function_set.name[i];
        String *macro = function_set.macros + i;
        String *public_name = function_set.public_name + i;
        
        macro->size = 0;
        macro->memory_size = name_string.size+4;
        
        macro->str = (char*)malloc(macro->memory_size);
        copy(macro, name_string);
        to_upper(macro);
        append(macro, make_lit_string("_SIG"));
        
        
        public_name->size = 0;
        public_name->memory_size = name_string.size;
        
        public_name->str = (char*)malloc(public_name->memory_size);
        copy(public_name, name_string);
        to_lower(public_name);
    }
    
    // NOTE(allen): Header
    FILE *file = fopen(API_H, "wb");
    
    for (int i = 0; i < sig_count; ++i){
        String ret_string   = function_set.ret[i];
        String args_string  = function_set.args[i];
        String macro_string = function_set.macros[i];
        
        fprintf(file, "#define %.*s(n) %.*s n%.*s\n",
                macro_string.size, macro_string.str,
                ret_string.size, ret_string.str,
                args_string.size, args_string.str
                );
    }
    
    fprintf(file, "extern \"C\"{\n");
    for (int i = 0; i < sig_count; ++i){
        String name_string  = function_set.name[i];
        String macro_string = function_set.macros[i];
        
        fprintf(file, "    typedef %.*s(%.*s_Function);\n",
                macro_string.size, macro_string.str,
                name_string.size, name_string.str);
    }
    fprintf(file, "}\n");
    
    fprintf(file, "struct Application_Links{\n");
    fprintf(file,
            "    void *memory;\n"
            "    int memory_size;\n"
            );
    for (int i = 0; i < sig_count; ++i){
        String name_string  = function_set.name[i];
        String public_string = function_set.public_name[i];
        
        fprintf(file, "    %.*s_Function *%.*s;\n",
                name_string.size, name_string.str,
                public_string.size, public_string.str);
    }
    fprintf(file,
            "    void *cmd_context;\n"
            "    void *system_links;\n"
            "    void *current_coroutine;\n"
            "    int type_coroutine;\n"
            );
    fprintf(file, "};\n");
    
    fprintf(file, "#define FillAppLinksAPI(app_links) do{");
    for (int i = 0; i < sig_count; ++i){
        String name = function_set.name[i];
        String public_string = function_set.public_name[i];
        
        fprintf(file,
                "\\\n"
                "app_links->%.*s = %.*s;",
                public_string.size, public_string.str,
                name.size, name.str
                );
    }
    fprintf(file, " } while(false)\n");
    
    fclose(file);
    
    // NOTE(allen): Documentation
    file = fopen(API_DOC, "wb");
    
#define CODE_STYLE "font-family: \"Courier New\", Courier, monospace; text-align: left;"
    
#define BACK_COLOR   "#FAFAFA"
#define TEXT_COLOR   "#0D0D0D"
#define CODE_BACK    "#DFDFDF"
    
#define POP_COLOR_1  "#309030"
#define POP_BACK_1   "#E0FFD0"
#define VISITED_LINK "#A0C050"
    
#define POP_COLOR_2  "#005000"
    
    fprintf(file,
            "<html lang=\"en-US\">\n"
            "<head>\n"
            "<title>4coder API Docs</title>\n"
            "<style>\n"
            
            "body { "
            "background: " BACK_COLOR "; "
            "color: " TEXT_COLOR "; "
            "}\n"
            
            // H things
            "h1,h2,h3,h4 { "
            "color: " POP_COLOR_1 "; "
            "margin: 0; "
            "}\n"
            
            "h4 { "
            "font-size: 1.1em; "
            "}\n"
            
            // ANCHORS
            "a { "
            "color: " POP_COLOR_1 "; "
            "text-decoration: none; "
            "}\n"
            "a:visited { "
            "color: " VISITED_LINK "; "
            "}\n"
            "a:hover { "
            "background: " POP_BACK_1 "; "
            "}\n"
            
            // LIST
            "ul { "
            "list-style: none; "
            "padding: 0; "
            "margin: 0; "
            "}\n"
            "li { "
            "padding-left: 1em;"
            "text-indent: -.7em;"
            "}\n"
            "li:before { "
            "content: \"4\"; "
            "color: " POP_COLOR_2 "; "
            "font-family:\"Webdings\"; "
            "}\n"
            
            "</style>\n"
            "</head>\n"
            "<body>\n"
            "<div style='font-family:Arial; margin: 0 auto; "
            "width: 900px; text-align: justify; line-height: 1.25;'>\n"
            "<h1 style='margin-top: 5mm; margin-bottom: 5mm;'>4coder API</h1>\n"
            );
    
    fprintf(file,
            "<h2>&sect;1 Introduction</h2>\n"
            "<div>\n"
            
            "<p>\n"
            "This is the documentation for " VERSION " The documentation has been made as "
            "accurate as possible but there may be errors. If you have questions or "
            "discover errors please contact <span style='"CODE_STYLE"'>editor@4coder.net</span>."
            "</p>\n"
            
            "<p>\n"
            "</p>\n"
            
            "</div>\n");
    
    fprintf(file, "<h2>&sect;2 Types and Functions</h2>\n");
    {
#undef SECTION
#define SECTION "2.1"
        
        fprintf(file,
                "<h3>&sect;"SECTION" Function List</h3>\n"
                "<ul>\n");
        
        for (int i = 0; i < sig_count; ++i){
            String name = function_set.public_name[i];
            fprintf(file,
                    "<li>\n"
                    "<a href='#%.*s_doc'>%.*s</a>\n"
                    "</li>\n",
                    name.size, name.str,
                    name.size, name.str
                    );
        }
        fprintf(file, "</ul>\n");
        
#undef SECTION
#define SECTION "2.2"
        
        fprintf(file, "<h3 style='margin-top: 5mm; margin-bottom: 5mm;'>&sect;"SECTION" Descriptions</h3>\n");
        for (int i = 0; i < sig_count; ++i){
            String name = function_set.public_name[i];
            
            fprintf(file,
                    "<div id='%.*s_doc' style='margin-bottom: 1cm;'>\n"
                    " <h4>&sect;"SECTION".%d: %.*s</h4>\n"
                    " <div style='"CODE_STYLE" margin-top: 3mm; margin-bottom: 3mm; font-size: .95em; "
                    "background: "CODE_BACK"; padding: 0.25em;'>",
                    name.size, name.str, i,
                    name.size, name.str
                    );
            
            String ret = function_set.ret[i];
            fprintf(file,
                    "%.*s app->%.*s(\n"
                    "<div style='margin-left: 4mm;'>",
                    ret.size, ret.str, name.size, name.str);
            
            Argument_Breakdown *breakdown = &function_set.breakdown[i];
            int arg_count = breakdown->count;
            for (int j = 0; j < arg_count; ++j){
                String param_string = breakdown->param_string[j];
                if (j < arg_count - 1){
                    fprintf(file, "%.*s,<br>", param_string.size, param_string.str);
                }
                else{
                    fprintf(file, "%.*s<br>", param_string.size, param_string.str);
                }
            }
            
            fprintf(file,
                    "</div>)\n"
                    "</div>\n");
            
            if (function_set.doc_string[i].size == 0){
                fprintf(file, "No documentation generated for this function, assume it is non-public.\n");
                fprintf(stderr, "warning: no documentation string for %.*s\n", name.size, name.str);
            }
            
#define DOC_HEAD_OPEN  "<div style='margin-top: 3mm; margin-bottom: 3mm; color: "POP_COLOR_1";'><b><i>"
#define DOC_HEAD_CLOSE "</i></b></div>"
            
#define DOC_ITEM_OPEN  "<div style='margin-left: 5mm; margin-right: 5mm;'>"
#define DOC_ITEM_CLOSE "</div>"
            
            Documentation *doc = &function_set.doc[i];
            
            int doc_param_count = doc->param_count;
            if (doc_param_count > 0){
                fprintf(file, DOC_HEAD_OPEN"Parameters"DOC_HEAD_CLOSE);
                
                for (int j = 0; j < doc_param_count; ++j){
                    String param_name = doc->param_name[j];
                    String param_docs = doc->param_docs[j];
                    
                    // TODO(allen): check that param_name is actually
                    // a parameter to this function!
                    
                    fprintf(file,
                            "<div>\n"
                            "<div style='font-weight: 600;'>%.*s</div>\n"
                            "<div style='margin-bottom: 6mm;'>"DOC_ITEM_OPEN"%.*s"DOC_ITEM_CLOSE"</div>\n"
                            "</div>\n",
                            param_name.size, param_name.str,
                            param_docs.size, param_docs.str
                            );
                }
            }
            
            String ret_doc = doc->return_doc;
            if (ret_doc.size != 0){
                fprintf(file, DOC_HEAD_OPEN"Return"DOC_HEAD_CLOSE);
                fprintf(file,
                        DOC_ITEM_OPEN"%.*s"DOC_ITEM_CLOSE,
                        ret_doc.size, ret_doc.str
                        );
            }
            
            String main_doc = doc->main_doc;
            if (main_doc.size != 0){
                fprintf(file, DOC_HEAD_OPEN"Description"DOC_HEAD_CLOSE);
                fprintf(file,
                        DOC_ITEM_OPEN"%.*s"DOC_ITEM_CLOSE,
                        main_doc.size, main_doc.str
                        );
            }
            
            int doc_see_count = doc->see_also_count;
            if (doc_see_count > 0){
                fprintf(file, DOC_HEAD_OPEN"See Also"DOC_HEAD_CLOSE);
                
                for (int j = 0; j < doc_see_count; ++j){
                    String see_also = doc->see_also[j];
                    fprintf(file,
                            DOC_ITEM_OPEN"<a href='#%.*s_doc'>%.*s</a>"DOC_ITEM_CLOSE,
                            see_also.size, see_also.str,
                            see_also.size, see_also.str
                            );
                }
            }
            
            fprintf(file, "</div><hr>\n");
        }
    }
    
    fprintf(file,
            "</div>\n"
            "</body>\n"
            "</html>\n"
            );
    
    fclose(file);

    return(filename);
}

int main(){
    char *filename = 0;
    
    filename = generate_keycode_enum();
    filename = generate_style();
    filename = generate_custom_headers();
}

// BOTTOM