/*
 * Mr. 4th Dimention - Allen Webster
 *
 * 25.02.2016
 *
 * Site generator for 4coder.
 *
 */

// TOP

#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
#define STB_IMAGE_RESIZE_IMPLEMENTATION
#include "stb_image_resize.h"
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb_image_write.h"

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

#include "../4ed_defines.h"
#include "../meta/4ed_meta_defines.h"

#include "../4coder_API/version.h"
#define FSTRING_IMPLEMENTATION
#include "../4coder_lib/4coder_string.h"
#include "../4cpp/4cpp_lexer.h"

#define FTECH_FILE_MOVING_IMPLEMENTATION
#include "../meta/4ed_file_moving.h"
#include "../meta/4ed_meta_parser.cpp"
#include "../meta/4ed_meta_keywords.h"
#include "4ed_abstract_document.cpp"

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

//
// Meta Parse Rules
//

internal void
do_html_output(Document_System *doc_system, char *dst_directory, Abstract_Item *doc){
    String out = make_string_cap(fm__push(10 << 20), 0, 10 << 20);
    Assert(out.str != 0);
    
    char doc_link[256];
    if (doc_get_link_string(doc, doc_link, sizeof(doc_link))){
        generate_document_html(&out, doc_system, doc);
        char *name = fm_str(dst_directory, "/", doc_link);
        fm_write_file(name, out.str, out.size);
        out.size = 0;
    }
}

// TODO(allen): replace the documentation declaration system with a straight up enriched text system
internal Abstract_Item*
generate_4coder_docs(Document_System *doc_system, char *code_directory, char *src_directory){
    Meta_Unit *custom_types_unit = fm_push_array(Meta_Unit, 1);
    Meta_Unit *lexer_funcs_unit = fm_push_array(Meta_Unit, 1);
    Meta_Unit *lexer_types_unit = fm_push_array(Meta_Unit, 1);
    Meta_Unit *string_unit = fm_push_array(Meta_Unit, 1);
    Meta_Unit *custom_funcs_unit = fm_push_array(Meta_Unit, 1);
    
    Enriched_Text *introduction = fm_push_array(Enriched_Text, 1);
    Enriched_Text *lexer_introduction = fm_push_array(Enriched_Text, 1);
    
    // NOTE(allen): Parse the code.
    *custom_types_unit = compile_meta_unit(code_directory, "4coder_API/types.h", ExpandArray(meta_keywords));
    Assert(custom_types_unit->count != 0);
    
    *lexer_funcs_unit = compile_meta_unit(code_directory, "4cpp/4cpp_lexer.h", ExpandArray(meta_keywords));
    Assert(lexer_funcs_unit->count != 0);
    
    *lexer_types_unit = compile_meta_unit(code_directory, "4cpp/4cpp_lexer_types.h", ExpandArray(meta_keywords));
    Assert(lexer_types_unit->count != 0);
    
    *string_unit = compile_meta_unit(code_directory, "string/internal_4coder_string.cpp", ExpandArray(meta_keywords));
    Assert(string_unit->count != 0);
    
    *custom_funcs_unit = compile_meta_unit(code_directory, "4ed_api_implementation.cpp", ExpandArray(meta_keywords));
    Assert(custom_funcs_unit->count != 0);
    
    // NOTE(allen): Compute and store variations of the custom function names
    Alternate_Names_Array *custom_func_names = fm_push_array(Alternate_Names_Array, 1);
    i32 name_count = custom_funcs_unit->set.count;
    custom_func_names->names = fm_push_array(Alternate_Name, name_count);
    memset(custom_func_names->names, 0, sizeof(*custom_func_names->names)*name_count);
    
    for (i32 i = 0; i < custom_funcs_unit->set.count; ++i){
        String name_string = custom_funcs_unit->set.items[i].name;
        String *macro = &custom_func_names->names[i].macro;
        String *public_name = &custom_func_names->names[i].public_name;
        
        *macro = str_alloc(name_string.size+4);
        to_upper_ss(macro, name_string);
        append_ss(macro, make_lit_string("_SIG"));
        
        *public_name = str_alloc(name_string.size);
        to_lower_ss(public_name, name_string);
        
        fm_align();
    }
    
    // NOTE(allen): Load enriched text materials
    *introduction = load_enriched_text(src_directory, "introduction.txt");
    *lexer_introduction = load_enriched_text(src_directory, "lexer_introduction.txt");
    
    // NOTE(allen): Put together the abstract document
    Abstract_Item *doc = begin_document_description(doc_system, "4coder API Docs", "custom_docs", true);
    
    add_table_of_contents(doc);
    
    begin_section(doc, "Introduction", "introduction");
    add_enriched_text(doc, introduction);
    end_section(doc);
    
    begin_section(doc, "4coder Systems", "4coder_systems");
    add_todo(doc);
    end_section(doc);
    
    begin_section(doc, "Types and Functions", "types_and_functions");
    {
        begin_section(doc, "Function List", 0);
        add_element_list(doc, custom_funcs_unit, custom_func_names, AltName_Public_Name);
        end_section(doc);
        begin_section(doc, "Type List", 0);
        add_element_list(doc, custom_types_unit);
        end_section(doc);
        begin_section(doc, "Function Descriptions", 0);
        add_full_elements(doc, custom_funcs_unit, custom_func_names, AltName_Public_Name);
        end_section(doc);
        begin_section(doc, "Type Descriptions", 0);
        add_full_elements(doc, custom_types_unit);
        end_section(doc);
    }
    end_section(doc);
    
    begin_section(doc, "String Library", "string_library");
    {
        begin_section(doc, "String Library Intro", 0);
        add_todo(doc);
        end_section(doc);
        begin_section(doc, "String Function List", 0);
        add_element_list(doc, string_unit);
        end_section(doc);
        begin_section(doc, "String Function Descriptions", 0);
        add_full_elements(doc, string_unit);
        end_section(doc);
    }
    end_section(doc);
    
    begin_section(doc, "Lexer Library", "lexer_library");
    {
        begin_section(doc, "Lexer Intro", 0);
        add_enriched_text(doc, lexer_introduction);
        end_section(doc);
        begin_section(doc, "Lexer Function List", 0);
        add_element_list(doc, lexer_funcs_unit);
        end_section(doc);
        begin_section(doc, "Lexer Type List", 0);
        add_element_list(doc, lexer_types_unit);
        end_section(doc);
        begin_section(doc, "Lexer Function Descriptions", 0);
        add_full_elements(doc, lexer_funcs_unit);
        end_section(doc);
        begin_section(doc, "Lexer Type Descriptions", 0);
        add_full_elements(doc, lexer_types_unit);
        end_section(doc);
    }
    end_section(doc);
    
    end_document_description(doc);
    
    return(doc);
}

internal Abstract_Item*
generate_page(Document_System *doc_system, char *code_directory, char *src_directory, char *source_text, char *big_title, char *small_name){
    Enriched_Text *home = fm_push_array(Enriched_Text, 1);
    *home = load_enriched_text(src_directory, source_text);
    
    Abstract_Item *doc = make_document_from_text(doc_system, big_title, small_name, home);
    if (doc == 0){
        fprintf(stdout, "warning: could not create document %s from file %s\n", small_name, source_text);
    }
    
    return(doc);
}

internal String
push_string(i32 size){
    String str = {0};
    str.memory_size = size;
    str.str = fm_push_array(char, size);
    fm_align();
    return(str);
}

internal void
do_image_resize(char *src_file, char *dst_file, char *extension, i32 w, i32 h){
    Temp temp = fm_begin_temp();
    
    i32 x = 0, y = 0, channels = 0;
    stbi_uc *image = stbi_load(src_file, &x, &y, &channels, 0);
    if (image != 0){
        stbi_uc *resized_image = fm_push_array(stbi_uc, w*h*channels);
        stbir_resize_uint8(image, x, y, x*channels, resized_image, w, h, w*channels, channels);
        
        if (match_cc(extension, "png")){
            stbi_write_png(dst_file, w, h, channels, resized_image, w*channels);
        }
        
        free(image);
    }
    
    fm_end_temp(temp);
}

internal void
generate_site(char *code_directory, char *asset_directory, char *src_directory, char *dst_directory){
    Document_System doc_system = create_document_system();
    
    struct Site_Asset{
        char *filename;
        char *extension;
        char *name;
        u32 type;
    };
    enum Site_Asset_Type{
        SiteAsset_None,
        SiteAsset_Generic,
        SiteAsset_Image,
    };
    
    Site_Asset asset_list[] = {
        {"4coder_logo_low_green.png", "png", "4coder_logo", SiteAsset_Image   },
        {"screen_1.png",              "png", "screen_1",    SiteAsset_Image   },
        {"screen_2.png",              "png", "screen_2",    SiteAsset_Image   },
        {"screen_3.png",              "png", "screen_3",    SiteAsset_Image   },
        {"4coder_icon.ico",           "ico", "4coder_icon", SiteAsset_Generic },
    };
    
    for (u32 i = 0; i < ArrayCount(asset_list); ++i){
        Site_Asset *asset = &asset_list[i];
        
        char *name = fm_str(asset_directory, "/", asset->filename);
        
        switch (asset_list[i].type){
            case SiteAsset_Generic:
            {
                add_generic_file(&doc_system, name, asset->extension, asset->name);
            }break;
            
            case SiteAsset_Image:
            {
                add_image_description(&doc_system, name, asset->extension, asset->name);
            }break;
            
            default: InvalidCodePath;
        }
    }
    
    char *cdir = code_directory;
    char *sdir = src_directory;
    Document_System *docs = &doc_system;
    
    generate_4coder_docs(docs, cdir, sdir);
    
    // TODO(allen): From the text file get the          "Big Title" and        "smallname".
    generate_page(docs, cdir, sdir, "home.txt"        , "4coder Home"        , "home"        );
    generate_page(docs, cdir, sdir, "docs.txt"        , "4coder API Docs"    , "custom_docs_2" );
    generate_page(docs, cdir, sdir, "feature_list.txt", "4coder Feature List", "features"    );
    generate_page(docs, cdir, sdir, "binding_list.txt", "4coder Binding List", "bindings"    );
    generate_page(docs, cdir, sdir, "roadmap.txt"     , "4coder Roadmap"     , "roadmap"     );
    generate_page(docs, cdir, sdir, "tutorials.txt"   , "4coder Tutorials"   , "tutorials"   );
    
    for (Basic_Node *node = doc_system.doc_list.head;
         node != 0;
         node = node->next){
        Abstract_Item *doc = NodeGetData(node, Abstract_Item);
        Assert(doc->item_type == ItemType_Document);
        do_html_output(&doc_system, dst_directory,  doc);
    }
    
    for (Basic_Node *node = doc_system.file_list.head;
         node != 0;
         node = node->next){
        Abstract_Item *file = NodeGetData(node, Abstract_Item);
        Assert(file->item_type == ItemType_GenericFile);
        
        char *file_name = fm_str(file->name, ".", file->extension);
        fm_copy_file(fm_str(file_name), fm_str(dst_directory, "/", file_name));
    }
    
    for (Basic_Node *node = doc_system.img_list.head;
         node != 0;
         node = node->next){
        Abstract_Item *img = NodeGetData(node, Abstract_Item);
        Assert(img->item_type == ItemType_Image);
        
        for (Basic_Node *node = img->img_instantiations.head;
             node != 0;
             node = node->next){
            Image_Instantiation *inst = NodeGetData(node, Image_Instantiation);
            
            char img_link[256];
            if (img_get_link_string(img, img_link, sizeof(img_link), inst->w, inst->h)){
                char *dest_file = fm_str(dst_directory, "/", img_link);
                do_image_resize(img->source_file, dest_file, img->extension, inst->w, inst->h);
            }
        }
    }
}

int main(int argc, char **argv){
    META_BEGIN();
    fm_init_system();
    
    if (argc == 5){
        generate_site(argv[1], argv[2], argv[3], argv[4]);
    }
    
    META_FINISH();
}

// BOTTOM