Chat-O-Matic/libs/librunview/RunView.cpp

/*
 * Copyright 2021, Jaidyn Levesque <jadedctrl@teknik.io>
 * All rights reserved. Distributed under the terms of the MIT license.
 */

#include "RunView.h"

#include <Cursor.h>
#include <Locale.h>
#include <MenuItem.h>
#include <PopUpMenu.h>
#include <ScrollBar.h>
#include <TextView.h>
#include <Window.h>


const uint32 kSearchDdg = 'RVse';
const uint32 kSearchDict = 'RVdc';


RunView::RunView(const char* name)
	:
	BTextView(name),
	fLastStyled(false),
	fUrlCursor(new BCursor(B_CURSOR_ID_FOLLOW_LINK)),
	fMouseDown(false),
	fSelecting(false)
{
	MakeEditable(false);
	SetStylable(true);
	AdoptSystemColors();
	SetViewCursor(B_CURSOR_SYSTEM_DEFAULT);

	text_run run = { 0, BFont(), ui_color(B_PANEL_TEXT_COLOR) };
	fDefaultRun = { 1, {run} };

	BFont urlFont;
	urlFont.SetFace(B_REGULAR_FACE | B_UNDERSCORE_FACE);
	text_run urlRun = { 0, urlFont, ui_color(B_LINK_TEXT_COLOR) };
	fUrlRun = { 1, {urlRun} };

	text_run urlHoverRun = { 0, urlFont, ui_color(B_LINK_HOVER_COLOR) };
	fUrlHoverRun = { 1, {urlHoverRun} };

	text_run urlVisitedRun = { 0, urlFont, ui_color(B_LINK_VISITED_COLOR) };
	fUrlVisitedRun = { 1, {urlVisitedRun} };
}


void
RunView::MessageReceived(BMessage* msg)
{
	switch (msg->what)
	{
		case kSearchDdg:
		case kSearchDict:
		{
			int32 start = 0;
			int32 end = 0;
			GetSelection(&start, &end);
			if (start == end)
				break;
			char* buffer = new char[end - start];
			GetText(start, end - start, buffer);

			// Build query
			BString query;
			if (msg->what == kSearchDict)
				query = "https://%lang%.wiktionary.org/w/index.php?search=%q%";
			else
				query = "https://duckduckgo.com/?q=%q%";

			BLanguage lang;
			if (BLocale().GetLanguage(&lang) == B_OK)
				query.ReplaceAll("%lang%", lang.Code());
			else
				query.ReplaceAll("%lang", "eo");

			query.ReplaceAll("%q%", BUrl::UrlEncode(BString(buffer)));

			// Send query
			BUrl url(query.String());
			if (url.IsValid())
				url.OpenWithPreferredApplication(true);
			break;
		}
		default:
			BTextView::MessageReceived(msg);
	}
}


void
RunView::Insert(const char* text, const text_run_array* runs)
{
	BString buf(text);

	int32 specStart = 0;
	int32 specEnd = 0;
	int32 lastEnd = 0;
	int32 length = buf.CountChars();

	while (_FindUrlString(buf, &specStart, &specEnd, lastEnd) == true) {
		if (lastEnd < specStart) {
			BString normie;
			buf.CopyCharsInto(normie, lastEnd, specStart - lastEnd);
			BTextView::Insert(normie.String(), runs);
		}
		BString special;
		buf.CopyCharsInto(special, specStart, specEnd - specStart);
		BTextView::Insert(special.String(), &fUrlRun);

		lastEnd = specEnd;
	}
	if (lastEnd < length) {
		BString remaining;
		buf.CopyCharsInto(remaining, lastEnd, length - lastEnd);
		BTextView::Insert(remaining.String(), runs);
	}
}


void
RunView::MouseDown(BPoint where)
{
	uint32 buttons = 0;
	Window()->CurrentMessage()->FindInt32("buttons", (int32*)&buttons);

	if (buttons & B_SECONDARY_MOUSE_BUTTON)
		_RightClickPopUp(where)->Go(ConvertToScreen(where), true, false);
	else
		BTextView::MouseDown(where);

	if ((buttons & B_PRIMARY_MOUSE_BUTTON) && OverUrl(where)) {
		fMouseDown = true;

		BUrl url(WordAt(where));
		if (url.IsValid() == true) {
			fLastClicked = url;
		}
	}
}


void
RunView::MouseUp(BPoint where)
{
	BTextView::MouseUp(where);

	if (fMouseDown && fSelecting == false && fLastClicked.IsValid() == true) {
		fLastClicked.OpenWithPreferredApplication(true);
		fLastClicked = BUrl();
		// When cursor moves off URL, change color
		fCurrentUrlRuns = fUrlVisitedRun;
	}
	fMouseDown = false;
	fSelecting = false;
}


void
RunView::MouseMoved(BPoint where, uint32 code, const BMessage* drag)
{
	if (fSelecting == true)
		return;

	// Change the cursor and "hover-over" highlight for URLs
	if (code == B_INSIDE_VIEW)
		if (OverUrl(where) == true) {
			int32 start = 0;
			int32 end = 0;
			FindWordAround(OffsetAt(where), &start, &end);
			if (fCurrentUrlEnd == 0
					|| (OffsetAt(where) < fCurrentUrlStart
						|| OffsetAt(where) > fCurrentUrlEnd))
			{
				if (fCurrentUrlEnd != 0)
					ReplaceRuns(fCurrentUrlStart, fCurrentUrlEnd,
						&fCurrentUrlRuns);
				fCurrentUrlRuns = *RunArray(start, end);
				fCurrentUrlStart = start;
				fCurrentUrlEnd = end;

				ReplaceRuns(start, end, &fUrlHoverRun);
			}
			SetViewCursor(fUrlCursor);
		}
		else {
			if (fCurrentUrlEnd != 0) {
				ReplaceRuns(fCurrentUrlStart, fCurrentUrlEnd, &fCurrentUrlRuns);
				fCurrentUrlStart = 0;
				fCurrentUrlEnd = 0;
			}
			SetViewCursor(B_CURSOR_SYSTEM_DEFAULT);
		}
}


void
RunView::Select(int32 startOffset, int32 endOffset)
{
	BTextView::Select(startOffset, endOffset);
	if (startOffset < endOffset) {
		fSelecting = true;
	}
}


void
RunView::Append(const char* text, rgb_color color, uint16 fontFace)
{
	BFont font;
	font.SetFace(fontFace);
	text_run run = { 0, font, color };
	text_run_array array = { 1, {run} };

	Insert(text, &array);
	fLastStyled = true;
}


void
RunView::Append(const char* text)
{
	if (fLastStyled == false)
		Insert(text);
	else
		Insert(text, &fDefaultRun);
	fLastStyled = false;
}


void
RunView::Replace(int32 start, int32 end, const char* text, text_run_array* runs)
{
	Delete(start, end);
	BTextView::Insert(start, text, strlen(text), runs);
}


void
RunView::ReplaceRuns(int32 start, int32 end, text_run_array* runs)
{
	char* buffer = new char[end - start];
	GetText(start, end - start, buffer);

	// Need to make sure nothing visibly changes to the user
	float current = ScrollBar(B_VERTICAL)->Value();
	int32 selStart = 0, selEnd = 0;
	GetSelection(&selStart, &selEnd);

	Replace(start, end, buffer, runs);

	ScrollBar(B_VERTICAL)->SetValue(current);
	if (end > 0)
		Select(selStart, selEnd);
}


BString
RunView::WordAt(BPoint point)
{
	int32 start = 0;
	int32 end = 0;
	BString word;

	FindWordAround(OffsetAt(point), &start, &end, &word);
	return word;
}


void
RunView::FindWordAround(int32 offset, int32* start, int32* end, BString* _word)
{
	int32 lineOffset = OffsetAt(LineAt(offset));
	const char* lineBuff = GetLine(LineAt(offset));
	BString line(lineBuff);
	delete lineBuff;

	int32 wordStart = line.FindLast(" ", offset - lineOffset) + 1;
	int32 wordEnd = line.FindFirst(" ", offset - lineOffset);

	if (wordStart == B_ERROR)
		wordStart = 0;
	if (wordEnd == B_ERROR)
		wordEnd = line.CountChars();

	*start = lineOffset + wordStart;
	*end = lineOffset + wordEnd;

	if (_word != NULL)
		line.CopyCharsInto(*_word, wordStart, wordEnd - wordStart);
}


const char*
RunView::GetLine(int32 line)
{
	int32 length = 0; 
	int32 startOffset = OffsetAt(line);
	int32 maxLength = TextLength() - startOffset;
	while (length < maxLength && ByteAt(startOffset + length) != '\n')
		length++;

	char* buffer = new char[length];
	GetText(startOffset, length, buffer);
	return buffer;
}


bool
RunView::OverText(BPoint where)
{
	int32 offset = OffsetAt(where);
	BPoint point = PointAt(offset);
	if (point.x + 10 < where.x)
		return false;
	return true;
}


bool
RunView::OverUrl(BPoint where)
{
	if (OverText(where) == false)
		return false;

	int32 offset = OffsetAt(where);
	text_run_array* rArray = RunArray(offset, offset + 1);
	text_run run = rArray->runs[0];
	text_run urlRun = fUrlRun.runs[0];
	text_run urlHover = fUrlHoverRun.runs[0];
	text_run urlVisit = fUrlVisitedRun.runs[0];

	if (run.font.Face() == urlRun.font.Face()
			&& (run.color == urlRun.color || run.color == urlHover.color
				|| run.color == urlVisit.color))
		return true;
	return false;
}


void
RunView::ScrollToBottom()
{
	ScrollToOffset(TextLength());
}


BPopUpMenu*
RunView::_RightClickPopUp(BPoint where)
{
	BPopUpMenu* menu = new BPopUpMenu("rightClickPopUp");
	BMenuItem* ddgSearch =
		new BMenuItem("Search" B_UTF8_ELLIPSIS, new BMessage(kSearchDdg));
	BMenuItem* dictSearch =
		new BMenuItem("Dictionary" B_UTF8_ELLIPSIS, new BMessage(kSearchDict));
	BMenuItem* copy =
		new BMenuItem("Copy", new BMessage(B_COPY), 'C', B_COMMAND_KEY);
	BMenuItem* selectAll = new BMenuItem("Select all",
		new BMessage(B_SELECT_ALL), 'A', B_COMMAND_KEY);

	// Try and ensure we have something selected
	int32 start = 0;
	int32 end = 0;
	GetSelection(&start, &end);

	if (start == end && OverText(where) == true) {
		start = 0;
		end = 0;
		FindWordAround(OffsetAt(where), &start, &end);
		Select(start, end);
	}
	copy->SetEnabled(start < end);
	dictSearch->SetEnabled(start < end);
	ddgSearch->SetEnabled(start < end);

	menu->AddItem(ddgSearch);
	menu->AddItem(dictSearch);
	menu->AddSeparatorItem();
	menu->AddItem(copy);
	menu->AddItem(selectAll);
	menu->SetTargetForItems(this);
	return menu;
}


bool
RunView::_FindUrlString(BString text, int32* start, int32* end, int32 offset)
{
	int32 urlOffset = text.FindFirst("://", offset);
	int32 urlStart = text.FindLast(" ", urlOffset) + 1;
	int32 urlEnd = text.FindFirst(" ", urlOffset);
	if (urlStart == B_ERROR)	urlStart = 0;
	if (urlEnd == B_ERROR)		urlEnd = text.CountChars();

	if (urlOffset != B_ERROR) {
		*start = urlStart;
		*end = urlEnd;
		return true;
	}
	return false;
}