/*
 * FreeTypeGX is a wrapper class for libFreeType which renders a compiled
 * FreeType parsable font so a GX texture for Wii homebrew development.
 * Copyright (C) 2008 Armin Tamzarian
 * Modified by Dimok, 2015 for WiiU GX2
 *
 * This file is part of FreeTypeGX.
 *
 * FreeTypeGX is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * FreeTypeGX is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with FreeTypeGX.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <gui/FreeTypeGX.h>
#include <gui/video/CVideo.h>
#include <gui/video/shaders/Texture2DShader.h>

using namespace std;

#define ALIGN4(x) (((x) + 3) & ~3)

/**
 * Default constructor for the FreeTypeGX class for WiiXplorer.
 */
FreeTypeGX::FreeTypeGX(const uint8_t *fontBuffer, FT_Long bufferSize, bool lastFace) {
    int32_t faceIndex = 0;
    ftPointSize = 0;
    GX2InitSampler(&ftSampler, GX2_TEX_CLAMP_MODE_CLAMP_BORDER, GX2_TEX_XY_FILTER_MODE_LINEAR);

    FT_Init_FreeType(&ftLibrary);
    if (lastFace) {
        FT_New_Memory_Face(ftLibrary, (FT_Byte *) fontBuffer, bufferSize, -1, &ftFace);
        faceIndex = ftFace->num_faces - 1; // Use the last face
        FT_Done_Face(ftFace);
        ftFace = NULL;
    }
    FT_New_Memory_Face(ftLibrary, (FT_Byte *) fontBuffer, bufferSize, faceIndex, &ftFace);

    ftKerningEnabled = FT_HAS_KERNING(ftFace);
}

/**
 * Default destructor for the FreeTypeGX class.
 */
FreeTypeGX::~FreeTypeGX() {
    unloadFont();
    FT_Done_Face(ftFace);
    FT_Done_FreeType(ftLibrary);
}

/**
 * Convert a short char string to a wide char string.
 *
 * This routine converts a supplied short character string into a wide character string.
 * Note that it is the user's responsibility to clear the returned buffer once it is no longer needed.
 *
 * @param strChar   Character string to be converted.
 * @return Wide character representation of supplied character string.
 */

wchar_t *FreeTypeGX::charToWideChar(const char *strChar) {
    if (!strChar) { return NULL; }

    size_t len = strlen(strChar) + 1;
    wchar_t *strWChar = new(std::nothrow) wchar_t[len];
    if (!strWChar) { return NULL; }

    size_t bt = mbstowcs(strWChar, strChar, len);
    if (bt == (size_t) -1) {
        return NULL;
    }

    if (bt < --len) {
        strWChar[bt] = 0;
    }

    return strWChar;
}

char *FreeTypeGX::wideCharToUTF8(const wchar_t *strChar) {
    if (!strChar) {
        return NULL;
    }

    size_t len = 0;
    wchar_t wc;

    for (size_t i = 0; strChar[i]; ++i) {
        wc = strChar[i];
        if (wc < 0x80) {
            ++len;
        } else if (wc < 0x800) {
            len += 2;
        } else if (wc < 0x10000) {
            len += 3;
        } else {
            len += 4;
        }
    }

    char *pOut = new(std::nothrow) char[len];
    if (!pOut) {
        return NULL;
    }

    size_t n = 0;

    for (size_t i = 0; strChar[i]; ++i) {
        wc = strChar[i];
        if (wc < 0x80) {
            pOut[n++] = (char) wc;
        } else if (wc < 0x800) {
            pOut[n++] = (char) ((wc >> 6) | 0xC0);
            pOut[n++] = (char) ((wc & 0x3F) | 0x80);
        } else if (wc < 0x10000) {
            pOut[n++] = (char) ((wc >> 12) | 0xE0);
            pOut[n++] = (char) (((wc >> 6) & 0x3F) | 0x80);
            pOut[n++] = (char) ((wc & 0x3F) | 0x80);
        } else {
            pOut[n++] = (char) (((wc >> 18) & 0x07) | 0xF0);
            pOut[n++] = (char) (((wc >> 12) & 0x3F) | 0x80);
            pOut[n++] = (char) (((wc >> 6) & 0x3F) | 0x80);
            pOut[n++] = (char) ((wc & 0x3F) | 0x80);
        }
    }
    pOut[n] = '\0';
    return pOut;
}

/**
 * Clears all loaded font glyph data.
 *
 * This routine clears all members of the font map structure and frees all allocated memory back to the system.
 */
void FreeTypeGX::unloadFont() {
    map<int16_t, ftGX2Data>::iterator itr;
    map<wchar_t, ftgxCharData>::iterator itr2;

    for (itr = fontData.begin(); itr != fontData.end(); itr++) {
        for (itr2 = itr->second.ftgxCharMap.begin(); itr2 != itr->second.ftgxCharMap.end(); itr2++) {
            if (itr2->second.texture) {
                if (itr2->second.texture->surface.image) {
                    free(itr2->second.texture->surface.image);
                }

                delete itr2->second.texture;
                itr2->second.texture = NULL;
            }
        }
    }

    fontData.clear();
}

/**
 * Caches the given font glyph in the instance font texture buffer.
 *
 * This routine renders and stores the requested glyph's bitmap and relevant information into its own quickly addressible
 * structure within an instance-specific map.
 *
 * @param charCode  The requested glyph's character code.
 * @return A pointer to the allocated font structure.
 */
ftgxCharData *FreeTypeGX::cacheGlyphData(wchar_t charCode, int16_t pixelSize) {
    map<int16_t, ftGX2Data>::iterator itr = fontData.find(pixelSize);
    if (itr != fontData.end()) {
        map<wchar_t, ftgxCharData>::iterator itr2 = itr->second.ftgxCharMap.find(charCode);
        if (itr2 != itr->second.ftgxCharMap.end()) {
            return &itr2->second;
        }
    }
    //!Cache ascender and decender as well
    ftGX2Data *ftData = &fontData[pixelSize];

    FT_UInt gIndex;
    uint16_t textureWidth = 0, textureHeight = 0;
    if (ftPointSize != pixelSize) {
        ftPointSize = pixelSize;
        FT_Set_Pixel_Sizes(ftFace, 0, ftPointSize);
        ftData->ftgxAlign.ascender = (int16_t) ftFace->size->metrics.ascender >> 6;
        ftData->ftgxAlign.descender = (int16_t) ftFace->size->metrics.descender >> 6;
        ftData->ftgxAlign.max = 0;
        ftData->ftgxAlign.min = 0;
    }

    gIndex = FT_Get_Char_Index(ftFace, (FT_ULong) charCode);
    if (gIndex != 0 && FT_Load_Glyph(ftFace, gIndex, FT_LOAD_DEFAULT | FT_LOAD_RENDER) == 0) {
        if (ftFace->glyph->format == FT_GLYPH_FORMAT_BITMAP) {
            FT_Bitmap *glyphBitmap = &ftFace->glyph->bitmap;

            textureWidth = ALIGN4(glyphBitmap->width);
            textureHeight = ALIGN4(glyphBitmap->rows);
            if (textureWidth == 0) {
                textureWidth = 4;
            }
            if (textureHeight == 0) {
                textureHeight = 4;
            }

            ftgxCharData *charData = &ftData->ftgxCharMap[charCode];
            charData->renderOffsetX = (int16_t) ftFace->glyph->bitmap_left;
            charData->glyphAdvanceX = (uint16_t) (ftFace->glyph->advance.x >> 6);
            charData->glyphAdvanceY = (uint16_t) (ftFace->glyph->advance.y >> 6);
            charData->glyphIndex = (uint32_t) gIndex;
            charData->renderOffsetY = (int16_t) ftFace->glyph->bitmap_top;
            charData->renderOffsetMax = (int16_t) ftFace->glyph->bitmap_top;
            charData->renderOffsetMin = (int16_t) glyphBitmap->rows - ftFace->glyph->bitmap_top;

            //! Initialize texture
            charData->texture = new GX2Texture;
            GX2InitTexture(charData->texture, textureWidth, textureHeight, 1, 0, GX2_SURFACE_FORMAT_UNORM_R5_G5_B5_A1, GX2_SURFACE_DIM_TEXTURE_2D, GX2_TILE_MODE_LINEAR_ALIGNED);

            loadGlyphData(glyphBitmap, charData);

            return charData;
        }
    }
    return NULL;
}

/**
 * Locates each character in this wrapper's configured font face and proccess them.
 *
 * This routine locates each character in the configured font face and renders the glyph's bitmap.
 * Each bitmap and relevant information is loaded into its own quickly addressible structure within an instance-specific map.
 */
uint16_t FreeTypeGX::cacheGlyphDataComplete(int16_t pixelSize) {
    uint32_t i = 0;
    FT_UInt gIndex;

    FT_ULong charCode = FT_Get_First_Char(ftFace, &gIndex);
    while (gIndex != 0) {
        if (cacheGlyphData(charCode, pixelSize) != NULL) { ++i; }
        charCode = FT_Get_Next_Char(ftFace, charCode, &gIndex);
    }
    return (uint16_t) (i);
}

/**
 * Loads the rendered bitmap into the relevant structure's data buffer.
 *
 * This routine does a simple byte-wise copy of the glyph's rendered 8-bit grayscale bitmap into the structure's buffer.
 * Each byte is converted from the bitmap's intensity value into the a uint32_t RGBA value.
 *
 * @param bmp   A pointer to the most recently rendered glyph's bitmap.
 * @param charData  A pointer to an allocated ftgxCharData structure whose data represent that of the last rendered glyph.
 */

void FreeTypeGX::loadGlyphData(FT_Bitmap *bmp, ftgxCharData *charData) {
    charData->texture->surface.image = (uint8_t *) memalign(charData->texture->surface.alignment, charData->texture->surface.imageSize);
    if (!charData->texture->surface.image) {
        return;
    }

    memset(charData->texture->surface.image, 0x00, charData->texture->surface.imageSize);

    uint8_t *src = (uint8_t *) bmp->buffer;
    uint16_t *dst = (uint16_t *) charData->texture->surface.image;
    uint32_t x, y;

    for (y = 0; y < bmp->rows; y++) {
        for (x = 0; x < bmp->width; x++) {
            uint8_t intensity = src[y * bmp->width + x] >> 3;
            dst[y * charData->texture->surface.pitch + x] = intensity ? ((intensity << 11) | (intensity << 6) | (intensity << 1) | 1) : 0;
        }
    }
    GX2Invalidate(GX2_INVALIDATE_MODE_CPU_TEXTURE, charData->texture->surface.image, charData->texture->surface.imageSize);
}

/**
 * Determines the x offset of the rendered string.
 *
 * This routine calculates the x offset of the rendered string based off of a supplied positional format parameter.
 *
 * @param width Current pixel width of the string.
 * @param format	Positional format of the string.
 */
int16_t FreeTypeGX::getStyleOffsetWidth(uint16_t width, uint16_t format) {
    if (format & FTGX_JUSTIFY_LEFT) {
        return 0;
    } else if (format & FTGX_JUSTIFY_CENTER) {
        return -(width >> 1);
    } else if (format & FTGX_JUSTIFY_RIGHT) { return -width; }
    return 0;
}

/**
 * Determines the y offset of the rendered string.
 *
 * This routine calculates the y offset of the rendered string based off of a supplied positional format parameter.
 *
 * @param offset	Current pixel offset data of the string.
 * @param format	Positional format of the string.
 */
int16_t FreeTypeGX::getStyleOffsetHeight(int16_t format, uint16_t pixelSize) {
    std::map<int16_t, ftGX2Data>::iterator itr = fontData.find(pixelSize);
    if (itr == fontData.end()) { return 0; }

    switch (format & FTGX_ALIGN_MASK) {
        case FTGX_ALIGN_TOP:
            return itr->second.ftgxAlign.descender;

        case FTGX_ALIGN_MIDDLE:
        default:
            return (itr->second.ftgxAlign.ascender + itr->second.ftgxAlign.descender + 1) >> 1;

        case FTGX_ALIGN_BOTTOM:
            return itr->second.ftgxAlign.ascender;

        case FTGX_ALIGN_BASELINE:
            return 0;

        case FTGX_ALIGN_GLYPH_TOP:
            return itr->second.ftgxAlign.max;

        case FTGX_ALIGN_GLYPH_MIDDLE:
            return (itr->second.ftgxAlign.max + itr->second.ftgxAlign.min + 1) >> 1;

        case FTGX_ALIGN_GLYPH_BOTTOM:
            return itr->second.ftgxAlign.min;
    }
    return 0;
}

/**
 * Processes the supplied text string and prints the results at the specified coordinates.
 *
 * This routine processes each character of the supplied text string, loads the relevant preprocessed bitmap buffer,
 * a texture from said buffer, and loads the resultant texture into the EFB.
 *
 * @param x Screen X coordinate at which to output the text.
 * @param y Screen Y coordinate at which to output the text. Note that this value corresponds to the text string origin and not the top or bottom of the glyphs.
 * @param text  NULL terminated string to output.
 * @param color Optional color to apply to the text characters. If not specified default value is ftgxWhite: (GXColor){0xff, 0xff, 0xff, 0xff}
 * @param textStyle Flags which specify any styling which should be applied to the rendered string.
 * @return The number of characters printed.
 */

uint16_t FreeTypeGX::drawText(CVideo *video, int16_t x, int16_t y, int16_t z, const wchar_t *text, int16_t pixelSize, const glm::vec4 &color, uint16_t textStyle, uint16_t textWidth, const float &textBlur, const float &colorBlurIntensity,
                              const glm::vec4 &blurColor, const float &superSamplingScale) {
    if (!text) { return 0; }

    uint16_t fullTextWidth = (textWidth > 0) ? textWidth : getWidth(text, pixelSize);
    uint16_t x_pos = x, printed = 0;
    uint16_t x_offset = 0, y_offset = 0;
    FT_Vector pairDelta;

    if (textStyle & FTGX_JUSTIFY_MASK) {
        x_offset = getStyleOffsetWidth(fullTextWidth, textStyle);
    }
    if (textStyle & FTGX_ALIGN_MASK) {
        y_offset = getStyleOffsetHeight(textStyle, pixelSize);
    }

    int32_t i = 0;
    while (text[i]) {
        ftgxCharData *glyphData = cacheGlyphData(text[i], pixelSize);

        if (glyphData != NULL) {
            if (ftKerningEnabled && i > 0) {
                FT_Get_Kerning(ftFace, fontData[pixelSize].ftgxCharMap[text[i - 1]].glyphIndex, glyphData->glyphIndex, FT_KERNING_DEFAULT, &pairDelta);
                x_pos += (pairDelta.x >> 6);

            }
            copyTextureToFramebuffer(video, glyphData->texture, x_pos + glyphData->renderOffsetX + x_offset, y + glyphData->renderOffsetY - y_offset, z, color, textBlur, colorBlurIntensity, blurColor, superSamplingScale);

            x_pos += glyphData->glyphAdvanceX;
            ++printed;
        }
        ++i;
    }

    return printed;
}


/**
 * Processes the supplied string and return the width of the string in pixels.
 *
 * This routine processes each character of the supplied text string and calculates the width of the entire string.
 * Note that if precaching of the entire font set is not enabled any uncached glyph will be cached after the call to this function.
 *
 * @param text  NULL terminated string to calculate.
 * @return The width of the text string in pixels.
 */
uint16_t FreeTypeGX::getWidth(const wchar_t *text, int16_t pixelSize) {
    if (!text) { return 0; }

    uint16_t strWidth = 0;
    int32_t i = 0;
    while (text[i]) {
        strWidth += getCharWidth(text[i], pixelSize, i > 0 ? text[i - 1] : 0);
        ++i;
    }
    return strWidth;
}

/**
 * Single char width
 */
uint16_t FreeTypeGX::getCharWidth(const wchar_t wChar, int16_t pixelSize, const wchar_t prevChar) {
    uint16_t strWidth = 0;
    ftgxCharData *glyphData = cacheGlyphData(wChar, pixelSize);

    if (glyphData != NULL) {
        if (ftKerningEnabled && prevChar != 0x0000) {
            FT_Vector pairDelta;
            FT_Get_Kerning(ftFace, fontData[pixelSize].ftgxCharMap[prevChar].glyphIndex, glyphData->glyphIndex, FT_KERNING_DEFAULT, &pairDelta);
            strWidth += pairDelta.x >> 6;
        }
        strWidth += glyphData->glyphAdvanceX;
    }

    return strWidth;
}

/**
 * Processes the supplied string and return the height of the string in pixels.
 *
 * This routine processes each character of the supplied text string and calculates the height of the entire string.
 * Note that if precaching of the entire font set is not enabled any uncached glyph will be cached after the call to this function.
 *
 * @param text  NULL terminated string to calculate.
 * @return The height of the text string in pixels.
 */
uint16_t FreeTypeGX::getHeight(const wchar_t *text, int16_t pixelSize) {
    if (text == NULL) {
        return 0;
    }

    int16_t strMax = 0, strMin = 0;
    int32_t i = 0;
    while (text[i]) {
        ftgxCharData *glyphData = cacheGlyphData(text[i], pixelSize);

        if (glyphData != NULL) {
            strMax = glyphData->renderOffsetMax > strMax ? glyphData->renderOffsetMax : strMax;
            strMin = glyphData->renderOffsetMin > strMin ? glyphData->renderOffsetMin : strMin;
        }

        ++i;
    }

    return strMax + strMin;
}

/**
 * Copies the supplied texture quad to the EFB.
 *
 * This routine uses the in-built GX quad builder functions to define the texture bounds and location on the EFB target.
 *
 * @param texObj	A pointer to the glyph's initialized texture object.
 * @param texWidth  The pixel width of the texture object.
 * @param texHeight The pixel height of the texture object.
 * @param screenX   The screen X coordinate at which to output the rendered texture.
 * @param screenY   The screen Y coordinate at which to output the rendered texture.
 * @param color Color to apply to the texture.
 */
void FreeTypeGX::copyTextureToFramebuffer(CVideo *pVideo, GX2Texture *texture, int16_t x, int16_t y, int16_t z, const glm::vec4 &color, const float &defaultBlur, const float &blurIntensity, const glm::vec4 &blurColor,
                                          const float &superSamplingScale) {
    static const float imageAngle = 0.0f;
    static const float blurScale = (2.0f);

    float offsetLeft = blurScale * (1.0f / superSamplingScale) * ((float) x + 0.5f * (float) texture->surface.width) * (float) pVideo->getWidthScaleFactor();
    float offsetTop = blurScale * (1.0f / superSamplingScale) * ((float) y - 0.5f * (float) texture->surface.height) * (float) pVideo->getHeightScaleFactor();

    float widthScale = blurScale * (1.0f / superSamplingScale) * (float) texture->surface.width * pVideo->getWidthScaleFactor();
    float heightScale = blurScale * (1.0f / superSamplingScale) * (float) texture->surface.height * pVideo->getHeightScaleFactor();

    glm::vec3 positionOffsets(offsetLeft, offsetTop, (float) z);

    //! blur doubles  due to blur we have to scale the texture
    glm::vec3 scaleFactor(widthScale, heightScale, 1.0f);

    glm::vec3 blurDirection;
    blurDirection[2] = 1.0f;

    Texture2DShader::instance()->setShaders();
    Texture2DShader::instance()->setAttributeBuffer();
    Texture2DShader::instance()->setAngle(imageAngle);
    Texture2DShader::instance()->setOffset(positionOffsets);
    Texture2DShader::instance()->setScale(scaleFactor);
    Texture2DShader::instance()->setTextureAndSampler(texture, &ftSampler);

    if (blurIntensity > 0.0f) {
        //! glow blur color
        Texture2DShader::instance()->setColorIntensity(blurColor);

        //! glow blur horizontal
        blurDirection[0] = blurIntensity;
        blurDirection[1] = 0.0f;
        Texture2DShader::instance()->setBlurring(blurDirection);
        Texture2DShader::instance()->draw();

        //! glow blur vertical
        blurDirection[0] = 0.0f;
        blurDirection[1] = blurIntensity;
        Texture2DShader::instance()->setBlurring(blurDirection);
        Texture2DShader::instance()->draw();
    }

    //! set text color
    Texture2DShader::instance()->setColorIntensity(color);

    //! blur horizontal
    blurDirection[0] = defaultBlur;
    blurDirection[1] = 0.0f;
    Texture2DShader::instance()->setBlurring(blurDirection);
    Texture2DShader::instance()->draw();

    //! blur vertical
    blurDirection[0] = 0.0f;
    blurDirection[1] = defaultBlur;
    Texture2DShader::instance()->setBlurring(blurDirection);
    Texture2DShader::instance()->draw();
}