/*
    FileHandler - Copyright (c) 2012 Fatbag <X-Fi6@phppoll.org>

    Permission to use, copy, modify, and/or distribute this software for any
    purpose with or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include <stdint.h>
#include <memory.h>
#include <stdio.h>
#include <setjmp.h> //Used by libpng
#include "bmp/read_bmp.h"
#include "libjpeg-turbo/jpeglib.h"
#include "libpng/png.h"
#define NOWINDOWS
#include "FileHandler.hpp"

namespace File {

enum SoundType {
    FSND_WAV,
    FSND_XA,
    FSND_UTK,
    FSND_MP3,
    FSND_COUNT
};

static uint8_t * ReadWAV(Image_t * Image, const uint8_t * InData, size_t FileSize);
static uint8_t * ReadXA(Image_t * Image, const uint8_t * InData, size_t FileSize);
static uint8_t * ReadUTK(Image_t * Image, const uint8_t * InData, size_t FileSize);
static uint8_t * ReadMP3(Image_t * Image, const uint8_t * InData, size_t FileSize);

static const uint8_t Signature[] = {
    'R', //WAV
    'X', //XA
    'U', //UTK
    0xFF //MP3
};
static uint8_t* (* const ImageFunction[])(Image_t*, const uint8_t*, size_t) = {
    ReadWAV,
    ReadXA,
    ReadUTK,
    ReadMP3
};

Image_t * ReadImageFile(const char * Filename){
    uint8_t * InData = File::ReadFile(Filename);
    if(InData == NULL) return NULL;
    
    if(File::FileSize < 4){
        free(InData);
        File::Error = FERR_INVALIDDATA;
        return NULL;
    }

    Image_t * Image = (Image_t*) malloc(sizeof(Image_t));
    if(Image == NULL){
        free(InData);
        File::Error = FERR_MEMORY;
        return NULL;
    }

    uint8_t * OutData = NULL;
    for(int i=0; i<FIMG_COUNT; i++){
        if(InData[0] == Signature[i]){
            OutData = ImageFunction[i](Image, InData, File::FileSize);
            free(InData);
            if(OutData == NULL){
                File::Error = FERR_INVALIDDATA;
                return NULL;
            }
            return Image;
        }
    }

    free(InData);
    File::Error = FERR_UNRECOGNIZED;
    return NULL;
}

static uint8_t * ReadBMP(Image_t * Image, const uint8_t * InData, size_t FileSize){
    bmpheader_t BMPHeader;
    if(!bmp_read_header(&BMPHeader, InData, FileSize)){
        return NULL;
    }
    
    uint8_t * OutData = (uint8_t*) malloc(BMPHeader.DecompressedSize);
    if(OutData == NULL){
        return NULL;
    }
    if(!bmp_read_data(&BMPHeader, InData, OutData)){
        free(OutData);
        return NULL;
    }
    
    Image->Width = BMPHeader.biWidth;
    Image->Height = BMPHeader.biHeight;
    Image->Format = FIMG_BGR24;
    Image->Data = OutData;
    return OutData;
}

static uint8_t * ReadJPG(Image_t * Image, const uint8_t * InData, size_t FileSize){
    //Initialize
    jpeg_decompress_struct cinfo;
    jpeg_error_mgr jerr;
    cinfo.err = jpeg_std_error(&jerr);
    jpeg_create_decompress(&cinfo);
    jpeg_mem_src(&cinfo, (unsigned char*) InData, FileSize);
    if(jpeg_read_header(&cinfo, TRUE) != JPEG_HEADER_OK){
        jpeg_destroy_decompress(&cinfo);
        return NULL;
    }
    cinfo.out_color_space = JCS_EXT_BGR;
    if(!jpeg_start_decompress(&cinfo)){
        jpeg_destroy_decompress(&cinfo);
        return NULL;
    }

    //Read
    unsigned row_stride = cinfo.output_width * cinfo.output_components;
    uint8_t * OutData = (uint8_t*) malloc(cinfo.output_width * cinfo.output_height * cinfo.output_components);
    if(OutData == NULL){
        jpeg_finish_decompress(&cinfo);
        jpeg_destroy_decompress(&cinfo);
        return NULL;
    }
    for(unsigned i=cinfo.output_height; i; i--){
        //According to the libjpeg documentation,
        //jpeg_read_scanlines can only really read 1 scanline at a time.
        //We need to convert to bottom-up format anyway.
        uint8_t * Location = OutData + (i-1)*row_stride;
        if(!jpeg_read_scanlines(&cinfo, &Location, 1)){
            free(OutData);
            jpeg_finish_decompress(&cinfo);
            jpeg_destroy_decompress(&cinfo);
            return NULL;
        }
    }

    //Close up
    jpeg_finish_decompress(&cinfo);
    jpeg_destroy_decompress(&cinfo);
    if(Image){
        Image->Width = cinfo.output_width;
        Image->Height = cinfo.output_height;
        Image->Format = FIMG_BGR24;
        Image->Data = OutData;
    }
    return OutData;
}

struct pngdata_t {
    const uint8_t * buffer;
    size_t size;
};
static void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length){
    pngdata_t *pngdata = (pngdata_t *) png_get_io_ptr(png_ptr);
    if(length > pngdata->size) png_error(png_ptr, "");
	memcpy(data, pngdata->buffer, length);
	pngdata->buffer += length;
    pngdata->size -= length;
}
static uint8_t * ReadPNG(Image_t * Image, const uint8_t * InData, size_t FileSize){
    pngdata_t pngdata;
    
    png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
    if(png_ptr == NULL) return 0;
    png_infop info_ptr = png_create_info_struct(png_ptr);
    if(info_ptr == NULL){
        png_destroy_read_struct(&png_ptr, NULL, NULL);
        return NULL;
    }
    if(setjmp(png_jmpbuf(png_ptr))){
        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
        return NULL;
    }
    
    pngdata.buffer = InData;
    pngdata.size = FileSize;
    png_set_read_fn(png_ptr, &pngdata, user_read_data);
    png_set_user_limits(png_ptr, 4096, 4096);
    png_read_png(png_ptr, info_ptr,
        PNG_TRANSFORM_STRIP_16 | PNG_TRANSFORM_STRIP_ALPHA |
        PNG_TRANSFORM_PACKING | PNG_TRANSFORM_GRAY_TO_RGB | PNG_TRANSFORM_BGR, NULL);
    
    //png_get_IHDR does not work in high-level mode.
    unsigned width = png_get_image_width(png_ptr, info_ptr);
    unsigned height = png_get_image_height(png_ptr, info_ptr);
    uint8_t * OutData = (uint8_t *) malloc(width*height*3);
    if(OutData == NULL){
        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
        return NULL;
    }
    
    uint8_t **Scanlines = png_get_rows(png_ptr, info_ptr);
    for(unsigned i=0; i<height; i++)
        memcpy(OutData + i*width*3, Scanlines[height-i-1], width*3);
    
    png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
    Image->Width = width;
    Image->Height = height;
    Image->Format = FIMG_BGR24;
    Image->Data = OutData;
    return OutData;
}

static uint8_t * ReadTGA(Image_t * Image, const uint8_t * InData, size_t FileSize){
    return NULL;
}

}