#include <ultra64.h>

#include "config.h"
#include "game_init.h"
#include "memory.h"
#include "print.h"
#include "segment2.h"

/**
 * This file handles printing and formatting the colorful text that
 * appears when printing things such as "PRESS START".
 */

struct TextLabel {
    u32 x;
    u32 y;
    s16 length;
    char buffer[50];
};

/**
 * Stores the text to be rendered on screen
 * and how they are to be rendered.
 */
struct TextLabel *sTextLabels[52];
s16 sTextLabelsCount = 0;

/**
 * Returns n to the exponent power, only for non-negative powers.
 */
s32 int_pow(s32 n, s32 exponent) {
    s32 result = 1;
    s32 i;

    for (i = 0; i < exponent; i++) {
        result = n * result;
    }

    return result;
}

/**
 * Formats an integer n for print by fitting it to width, prefixing with a negative,
 * and converting the base.
 */
void format_integer(s32 n, s32 base, char *dest, s32 *totalLength, u8 width, s8 zeroPad) {
    u32 powBase;
    s32 numDigits = 0;
    s32 i;
    s32 len = 0;
    s8 digit;
    s8 negative = FALSE;
    char pad;

    if (zeroPad == TRUE) {
        pad = '0';
    } else {
        pad = -1;
    }

    if (n != 0) {
        // Formats a negative number for negative prefix.
        if (n < 0) {
            n = -n;
            negative = TRUE;
        }

        // Increments the number of digits until length is long enough.
        while (TRUE) {
            powBase = int_pow(base, numDigits);

            if (powBase > (u32) n) {
                break;
            }

            numDigits++;
        }

        // Add leading pad to fit width.
        if (width > numDigits) {
            for (len = 0; len < width - numDigits; len++) dest[len] = pad;

            // Needs 1 length to print negative prefix.
            if (negative == TRUE) {
                len--;
            }
        }

        // Use 'M' prefix to indicate negative numbers.
        if (negative == TRUE) {
            dest[len] = 'M';
            len++;
        }

        // Transfer the digits into the proper base.
        for (i = numDigits - 1; i >= 0; i--) {
            powBase = int_pow(base, i);
            digit = n / powBase;

            // FIXME: Why doesn't [] match?
            if (digit < 10) {
                *(dest + len + numDigits - 1 - i) = digit + '0';
            } else {
                *(dest + len + numDigits - 1 - i) = digit + '7';
            }

            n -= digit * powBase;
        }
    } else // n is zero.
    {
        numDigits = 1;
        if (width > numDigits) {
            for (len = 0; len < width - numDigits; len++) dest[len] = pad;
        }
        dest[len] = '0';
    }

    *totalLength += numDigits + len;
}

/**
 * Determines the width of the number for printing, writing to 'width'.
 * Additionally, this determines if a number should be zero-padded,
 * writing to 'zeroPad'.
 */
void parse_width_field(const char *str, s32 *srcIndex, u8 *width, s8 *zeroPad) {
    s8 digits[12]; // unknown length
    s8 digitsLen = 0;
    s16 i;

    // If first character is 0, then the string should be zero padded.
    if (str[*srcIndex] == '0') {
        *zeroPad = TRUE;
    }

    // Read width digits up until the 'd' or 'x' format specifier.
    while (str[*srcIndex] != 'd' && str[*srcIndex] != 'x') {
        digits[digitsLen] = str[*srcIndex] - '0';

        if (digits[digitsLen] < 0 || digits[digitsLen] >= 10) // not a valid digit
        {
            *width = 0;
            return;
        }

        digitsLen++;
        (*srcIndex)++;
    }

    // No digits
    if (digitsLen == 0) {
        return;
    }

    // Sum the digits to calculate the total width.
    for (i = 0; i < digitsLen - 1; i++) {
        *width = *width + digits[i] * ((digitsLen - i - 1) * 10);
    }

    *width = *width + digits[digitsLen - 1];
}

/**
 * Takes a number, finds the intended base, formats the number, and prints it
 * at the given X & Y coordinates.
 *
 * Warning: this fails on too large numbers, because format_integer has bugs
 * related to overflow. For romhacks, prefer sprintf + print_text.
 */
void print_text_fmt_int(s32 x, s32 y, const char *str, s32 n) {
    char c = 0;
    s8 zeroPad = FALSE;
    u8 width = 0;
    s32 base = 0;
    s32 len = 0;
    s32 srcIndex = 0;

    // Don't continue if there is no memory to do so.
    if ((sTextLabels[sTextLabelsCount] = mem_pool_alloc(gEffectsMemoryPool,
                                                        sizeof(struct TextLabel))) == NULL) {
        return;
    }

    sTextLabels[sTextLabelsCount]->x = x;
    sTextLabels[sTextLabelsCount]->y = y;

    c = str[srcIndex];

    while (c != 0) {
        if (c == '%') {
            srcIndex++;

            parse_width_field(str, &srcIndex, &width, &zeroPad);

            if (str[srcIndex] != 'd' && str[srcIndex] != 'x') {
                break;
            }
            if (str[srcIndex] == 'd') {
                base = 10;
            }
            if (str[srcIndex] == 'x') {
                base = 16;
            }

            srcIndex++;

            format_integer(n, base, sTextLabels[sTextLabelsCount]->buffer + len, &len, width, zeroPad);
        } else // straight copy
        {
            sTextLabels[sTextLabelsCount]->buffer[len] = c;
            len++;
            srcIndex++;
        }
        c = str[srcIndex];
    }

    sTextLabels[sTextLabelsCount]->length = len;
    sTextLabelsCount++;
}

/**
 * Prints text in the colorful lettering at given X, Y coordinates.
 */
void print_text(s32 x, s32 y, const char *str) {
    char c = 0;
    s32 length = 0;
    s32 srcIndex = 0;

    // Don't continue if there is no memory to do so.
    if ((sTextLabels[sTextLabelsCount] = mem_pool_alloc(gEffectsMemoryPool,
                                                        sizeof(struct TextLabel))) == NULL) {
        return;
    }

    sTextLabels[sTextLabelsCount]->x = x;
    sTextLabels[sTextLabelsCount]->y = y;

    c = str[srcIndex];

    // Set the array with the text to print while finding length.
    while (c != 0) {
        sTextLabels[sTextLabelsCount]->buffer[length] = c;
        length++;
        srcIndex++;
        c = str[srcIndex];
    }

    sTextLabels[sTextLabelsCount]->length = length;
    sTextLabelsCount++;
}

/**
 * Prints text in the colorful lettering centered at given X, Y coordinates.
 */
void print_text_centered(s32 x, s32 y, const char *str) {
    char c = 0;
    UNUSED s8 unused1 = 0;
    UNUSED s32 unused2 = 0;
    s32 length = 0;
    s32 srcIndex = 0;

    // Don't continue if there is no memory to do so.
    if ((sTextLabels[sTextLabelsCount] = mem_pool_alloc(gEffectsMemoryPool,
                                                        sizeof(struct TextLabel))) == NULL) {
        return;
    }

    c = str[srcIndex];

    // Set the array with the text to print while finding length.
    while (c != 0) {
        sTextLabels[sTextLabelsCount]->buffer[length] = c;
        length++;
        srcIndex++;
        c = str[srcIndex];
    }

    sTextLabels[sTextLabelsCount]->length = length;
    sTextLabels[sTextLabelsCount]->x = x - length * 12 / 2;
    sTextLabels[sTextLabelsCount]->y = y;
    sTextLabelsCount++;
}

/**
 * Converts a char into the proper colorful glyph for the char.
 */
s8 char_to_glyph_index(char c) {
    if (c >= 'A' && c <= 'Z') {
        return c - 55;
    }

    if (c >= 'a' && c <= 'z') {
        return c - 87;
    }

    if (c >= '0' && c <= '9') {
        return c - 48;
    }

    if (c == ' ') {
        return GLYPH_SPACE;
    }

    if (c == '!') {
        return GLYPH_EXCLAMATION_PNT; // !, JP only
    }

    if (c == '#') {
        return GLYPH_TWO_EXCLAMATION; // !!, JP only
    }

    if (c == '?') {
        return GLYPH_QUESTION_MARK; // ?, JP only
    }

    if (c == '&') {
        return GLYPH_AMPERSAND; // &, JP only
    }

    if (c == '%') {
        return GLYPH_PERCENT; // %, JP only
    }

    if (c == '*') {
        return GLYPH_MULTIPLY; // x
    }

    if (c == '+') {
        return GLYPH_COIN; // coin
    }

    if (c == ',') {
        return GLYPH_MARIO_HEAD; // Imagine I drew Mario's head
    }

    if (c == '-') {
        return GLYPH_STAR; // star
    }

    if (c == '.') {
        return GLYPH_PERIOD; // large shaded dot, JP only
    }

    if (c == '/') {
        return GLYPH_BETA_KEY; // beta key, JP only. Reused for Ü in EU.
    }

    return GLYPH_SPACE;
}

/**
 * Adds an individual glyph to be rendered.
 */
void add_glyph_texture(s8 glyphIndex) {
    const u8 *const *glyphs = segmented_to_virtual(main_hud_lut);

    gDPPipeSync(gDisplayListHead++);
    gDPSetTextureImage(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 1, glyphs[glyphIndex]);
    gSPDisplayList(gDisplayListHead++, dl_hud_img_load_tex_block);
}

#ifndef WIDESCREEN
/**
 * Clips textrect into the boundaries defined.
 */
void clip_to_bounds(s32 *x, s32 *y) {
    if (*x < TEXRECT_MIN_X) {
        *x = TEXRECT_MIN_X;
    }

    if (*x > TEXRECT_MAX_X) {
        *x = TEXRECT_MAX_X;
    }

    if (*y < TEXRECT_MIN_Y) {
        *y = TEXRECT_MIN_Y;
    }

    if (*y > TEXRECT_MAX_Y) {
        *y = TEXRECT_MAX_Y;
    }
}
#endif

/**
 * Renders the glyph that's set at the given position.
 */
void render_textrect(s32 x, s32 y, s32 pos) {
    s32 rectBaseX = x + pos * 12;
    s32 rectBaseY = 224 - y;
    s32 rectX;
    s32 rectY;

#ifndef WIDESCREEN
    // For widescreen we must allow drawing outside the usual area
    clip_to_bounds(&rectBaseX, &rectBaseY);
#endif
    rectX = rectBaseX;
    rectY = rectBaseY;
    gSPTextureRectangle(gDisplayListHead++, rectX << 2, rectY << 2, (rectX + 15) << 2,
                        (rectY + 15) << 2, G_TX_RENDERTILE, 0, 0, 4 << 10, 1 << 10);
}

/**
 * Renders the text in sTextLabels on screen at the proper locations by iterating
 * a for loop.
 */
void render_text_labels(void) {
    s32 i;
    s32 j;
    s8 glyphIndex;
    Mtx *mtx;

    if (sTextLabelsCount == 0) {
        return;
    }

    mtx = alloc_display_list(sizeof(*mtx));

    if (mtx == NULL) {
        sTextLabelsCount = 0;
        return;
    }

    guOrtho(mtx, 0.0f, SCREEN_WIDTH, 0.0f, SCREEN_HEIGHT, -10.0f, 10.0f, 1.0f);
    gSPPerspNormalize((Gfx *) (gDisplayListHead++), 0xFFFF);
    gSPMatrix(gDisplayListHead++, VIRTUAL_TO_PHYSICAL(mtx), G_MTX_PROJECTION | G_MTX_LOAD | G_MTX_NOPUSH);
    gSPDisplayList(gDisplayListHead++, dl_hud_img_begin);

    for (i = 0; i < sTextLabelsCount; i++) {
        for (j = 0; j < sTextLabels[i]->length; j++) {
            glyphIndex = char_to_glyph_index(sTextLabels[i]->buffer[j]);

            if (glyphIndex != GLYPH_SPACE) {
#ifdef VERSION_EU
                // Beta Key was removed by EU, so glyph slot reused.
                // This produces a colorful Ü.
                if (glyphIndex == GLYPH_BETA_KEY) {
                    add_glyph_texture(GLYPH_U);
                    render_textrect(sTextLabels[i]->x, sTextLabels[i]->y, j);

                    add_glyph_texture(GLYPH_UMLAUT);
                    render_textrect(sTextLabels[i]->x, sTextLabels[i]->y + 3, j);
                } else {
                    add_glyph_texture(glyphIndex);
                    render_textrect(sTextLabels[i]->x, sTextLabels[i]->y, j);
                }
#else
                add_glyph_texture(glyphIndex);
                render_textrect(sTextLabels[i]->x, sTextLabels[i]->y, j);
#endif
            }
        }

        mem_pool_free(gEffectsMemoryPool, sTextLabels[i]);
    }

    gSPDisplayList(gDisplayListHead++, dl_hud_img_end);

    sTextLabelsCount = 0;
}
