/*  Starshatter OpenSource Distribution
    Copyright (c) 1997-2004, Destroyer Studios LLC.
    All Rights Reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * Neither the name "Destroyer Studios" nor the names of its contributors
      may be used to endorse or promote products derived from this software
      without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.

    SUBSYSTEM:    nGenEx.lib
    FILE:         RichTextBox.cpp
    AUTHOR:       John DiCamillo


    OVERVIEW
    ========
    Window class
*/

#include "MemDebug.h"
#include "RichTextBox.h"
#include "EventDispatch.h"
#include "Color.h"
#include "Bitmap.h"
#include "Font.h"
#include "FontMgr.h"
#include "Mouse.h"
#include "Screen.h"
#include "View.h"

// +--------------------------------------------------------------------+

RichTextBox::RichTextBox(ActiveWindow* p, int ax, int ay, int aw, int ah, DWORD aid, DWORD astyle)
: ScrollWindow(p->GetScreen(), ax, ay, aw, ah, aid, astyle, p)
{
    leading           = 2;

    char buf[32];
    sprintf_s(buf, "RichTextBox %d", id);
    desc = buf;
}

RichTextBox::RichTextBox(Screen* screen, int ax, int ay, int aw, int ah, DWORD aid, DWORD astyle)
: ScrollWindow(screen, ax, ay, aw, ah, aid, astyle)
{
    leading           = 2;

    char buf[32];
    sprintf_s(buf, "RichTextBox %d", id);
    desc = buf;
}

RichTextBox::~RichTextBox()
{
}

// +--------------------------------------------------------------------+

void
RichTextBox::SetText(const char* t)
{
    ActiveWindow::SetText(t);
    ScrollTo(0);
}

// +--------------------------------------------------------------------+

void
RichTextBox::DrawContent(const Rect& ctrl_rect)
{
    DrawTabbedText();
}

// +--------------------------------------------------------------------+

void
RichTextBox::DrawTabbedText()
{
    if (font && text.length()) {
        int border_size = 4;

        if (style & WIN_RAISED_FRAME && style & WIN_SUNK_FRAME)
        border_size = 8;

        Rect label_rect = rect;

        label_rect.x  = border_size;
        label_rect.y  = border_size;
        label_rect.w -= border_size * 2;
        label_rect.h -= border_size * 2;

        if (scroll_bar)
        label_rect.w -= SCROLL_TRACK;

        if (line_height < font->Height())
        line_height = font->Height();

        font->SetColor(fore_color);
        DrawRichText(label_rect);
    }
}

// +--------------------------------------------------------------------+

int RichTextBox::find_next_word_start(const char* text, int index)
{
    // step through intra-word space:
    while (text[index] && isspace(text[index]) &&
    (text[index] != '\t')                &&
    (text[index] != '\n')                &&
    (text[index] != '<'))
    index++;

    return index;
}

int RichTextBox::find_next_word_end(const char* text, int index)
{
    // check for leading newline or tag:
    if (text[index] == '\n' || text[index] == '\t' || text[index] == '<')
    return index;

    // step through intra-word space:
    while (text[index] && isspace(text[index]))
    index++;

    // step through word:
    while (text[index] && !isspace(text[index]) &&
    (text[index] != '-')                  &&
    (text[index] != '<'))
    index++;

    if (index) {
        if (text[index] != '-')
        return index-1;
        else
        return index;
    }

    return 0;
}

int RichTextBox::parse_hex_digit(char c)
{
    if (isalpha(c))
    return 10 + tolower(c) - 'a';

    else if (isdigit(c))
    return c - '0';

    return 0;
}

int RichTextBox::process_tag(const char* text, int index, Font*& font)
{
    if (text[index] == '<') {
        char tag[64];
        int  i = 0;

        while (text[index] && (text[index] != '>'))
        tag[i++] = text[index++];

        if (text[index] == '>')
        tag[i++] = text[index++];

        tag[i] = 0;

        switch (tag[1]) {
        case 'c':
        case 'C':   if (_strnicmp(tag+1, "color", 5) == 0) {
                int r = 0;
                int g = 0;
                int b = 0;

                if (i > 12) {
                    r = 16 * parse_hex_digit(tag[ 7]) + parse_hex_digit(tag[ 8]);
                    g = 16 * parse_hex_digit(tag[ 9]) + parse_hex_digit(tag[10]);
                    b = 16 * parse_hex_digit(tag[11]) + parse_hex_digit(tag[12]);
                }

                font->SetColor(Color(r,g,b));
            }
            break;

        case 'f':
        case 'F':   if (_strnicmp(tag+1, "font", 4) == 0) {
                Color current_color = Color::White;

                if (font)
                current_color = font->GetColor();

                tag[i-1] = 0;
                font = FontMgr::Find(tag+6);
                font->SetColor(current_color);
            }
            break;
        }
    }

    return index;
}

int
RichTextBox::GetNextTab(int xpos)
{
    for (int i = 0; i < 10; i++) {
        if (tab[i] > xpos)
        return tab[i];
    }

    return (xpos / 20) * 20 + 20;
}

void
RichTextBox::DrawRichText(Rect& text_rect)
{
    // clip the rect:
    Rect clip_rect = ClipRect(text_rect);
    clip_rect.h -= 8;

    if (clip_rect.w < 1 || clip_rect.h < 1)
    return;

    const char* t     = text.data();
    int count         = text.length();
    int nlines        = 0;

    int xpos          = 0;
    int block_start   = 0;
    int block_count   = 0;
    int curr_word_end = -1;
    int next_word_end = 0;
    int eol_index     = 0;

    int new_line      = 0;
    int x_offset      = 0;
    int y_offset      = 0;
    int length        = 0;

    Font* rich_font   = font;
    rich_font->SetColor(fore_color);

    if (smooth_scroll) {
        double fraction = smooth_offset - (int) smooth_offset;

        y_offset = (int) ((1-fraction) * (rich_font->Height() + leading));
    }

    // while there is still text:
    while (block_start < count) {
        bool found_tag = false;

        do {
            found_tag = false;

            if (t[block_start] == '<') {
                block_start = process_tag(t, block_start, rich_font);
                found_tag = true;
            }

            else if (t[block_start] == '\t') {
                block_start++;
                x_offset = GetNextTab(x_offset);

                if (x_offset > text_rect.w) {
                    nlines++;
                    if (nlines > top_index)
                    y_offset += rich_font->Height() + leading;
                    x_offset = 0;
                    new_line = false;
                }

                found_tag = true;
            }

            else if (t[block_start] == '\r') {
                block_start++;

                if (t[block_start] == '\n')
                block_start++;

                nlines++;
                if (nlines > top_index)
                y_offset += rich_font->Height() + leading;
                x_offset = 0;
                new_line = false;

                found_tag = true;
            }

            else if (t[block_start] == '\n') {
                block_start++;

                if (t[block_start] == '\r')
                block_start++;

                nlines++;
                if (nlines > top_index)
                y_offset += rich_font->Height() + leading;
                x_offset = 0;
                new_line = false;

                found_tag = true;
            }
        }
        while (found_tag);

        next_word_end = find_next_word_end(t, block_start);

        if (!next_word_end || next_word_end == curr_word_end) {
            new_line = true;
        }

        else if (t[next_word_end] == '\n') {
            eol_index = curr_word_end = next_word_end;
            new_line = true;
        }

        else {
            int word_len = next_word_end - block_start + 1;

            length = rich_font->StringWidth(t+block_start, word_len);

            // if this word was too long, wrap to next line:
            if (x_offset + length > text_rect.w) {
                nlines++;
                if (nlines > top_index)
                y_offset += rich_font->Height() + leading;
                x_offset = 0;
                new_line = false;
            }

            // is there a trailing newline?
            curr_word_end = next_word_end;

            // check for a newline in the next block of white space:
            eol_index = 0;
            const char* eol = &t[curr_word_end+1];
            while (*eol && isspace(*eol) && *eol != '\n')
            eol++;

            if (*eol == '\n') {
                eol_index = eol - t;
                new_line = true;
            }
        }

        block_count = curr_word_end - block_start + 1;

        if (block_count > 0) {
            length = rich_font->StringWidth(t+block_start, block_count);
        }

        // there was a single word longer than the entire line:
        else {
            block_count = next_word_end - block_start + 1;
            length = rich_font->StringWidth(t+block_start, block_count);
            curr_word_end = next_word_end;
        }

        if (length > 0 && nlines >= top_index && nlines < top_index+page_size) {
            int x1 = text_rect.x + x_offset + rect.x;
            int y1 = text_rect.y + y_offset + rect.y;

            rich_font->DrawString(t+block_start, block_count, x1, y1, clip_rect);
        }

        if (new_line) {
            nlines++;
            if (nlines > top_index)
            y_offset += rich_font->Height() + leading;
            x_offset = 0;
            new_line = false;
        }

        else if (length < 1 || text[next_word_end] == '-') {
            x_offset += length;
        }

        else {
            x_offset += length + rich_font->SpaceWidth();
        }

        if (eol_index > 0)
        curr_word_end = eol_index;

        block_start = find_next_word_start(t, curr_word_end+1);
    }

    line_count = nlines;
}

// +--------------------------------------------------------------------+

int RichTextBox::OnMouseMove(int x, int y)
{
    if (captured) {
        ActiveWindow* test = GetCapture();

        if (test != this) {
            captured = false;
        }

        else {
            if (scrolling == SCROLL_THUMB) {
                mouse_y = y - rect.y - TRACK_START;

                int dest = (int) ((double) mouse_y/track_length * (line_count-1));
                ScrollTo(dest);
            }
        }
    }

    return ActiveWindow::OnMouseMove(x,y);
}

// +--------------------------------------------------------------------+

int RichTextBox::OnLButtonDown(int x, int y)
{
    return ScrollWindow::OnLButtonDown(x,y);
}

// +--------------------------------------------------------------------+

int RichTextBox::OnLButtonUp(int x, int y)
{
    return ScrollWindow::OnLButtonUp(x,y);
}

// +--------------------------------------------------------------------+

int RichTextBox::OnMouseWheel(int wheel)
{
    return ScrollWindow::OnMouseWheel(wheel);
}

// +--------------------------------------------------------------------+

int RichTextBox::OnClick()
{
    int fire_click = !scrolling;

    if (scrolling == SCROLL_THUMB)
    scrolling = SCROLL_NONE;

    if (fire_click)
    return ActiveWindow::OnClick();

    return 0;
}

// +--------------------------------------------------------------------+

int RichTextBox::OnKeyDown(int vk, int flags)
{
    return ScrollWindow::OnKeyDown(vk, flags);
}