// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/shell/layout_test_controller.h"

#include "base/stringprintf.h"
#include "content/public/renderer/render_view.h"
#include "content/shell/shell_messages.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebCString.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebElement.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"

using WebKit::WebFrame;
using WebKit::WebElement;
using WebKit::WebSize;

namespace content {

namespace {

std::string DumpDocumentText(WebFrame* frame) {
  // We use the document element's text instead of the body text here because
  // not all documents have a body, such as XML documents.
  WebElement documentElement = frame->document().documentElement();
  if (documentElement.isNull())
    return std::string();
  return documentElement.innerText().utf8();
}

std::string DumpDocumentPrintedText(WebFrame* frame) {
  return frame->renderTreeAsText(WebFrame::RenderAsTextPrinting).utf8();
}

std::string DumpFramesAsText(WebFrame* frame, bool printing, bool recursive) {
  std::string result;

  // Cannot do printed format for anything other than HTML.
  if (printing && !frame->document().isHTMLDocument())
    return std::string();

  // Add header for all but the main frame. Skip emtpy frames.
  if (frame->parent() && !frame->document().documentElement().isNull()) {
    result.append("\n--------\nFrame: '");
    result.append(frame->name().utf8().data());
    result.append("'\n--------\n");
  }

  result.append(
      printing ? DumpDocumentPrintedText(frame) : DumpDocumentText(frame));
  result.append("\n");

  if (recursive) {
    for (WebFrame* child = frame->firstChild(); child;
         child = child->nextSibling()) {
      result.append(DumpFramesAsText(child, printing, recursive));
    }
  }
  return result;
}

std::string DumpFrameScrollPosition(WebFrame* frame, bool recursive) {
  std::string result;

  WebSize offset = frame->scrollOffset();
  if (offset.width > 0 || offset.height > 0) {
    if (frame->parent()) {
      result.append(
          base::StringPrintf("frame '%s' ", frame->name().utf8().data()));
    }
    result.append(
        base::StringPrintf("scrolled to %d,%d\n", offset.width, offset.height));
  }

  if (recursive) {
    for (WebFrame* child = frame->firstChild(); child;
         child = child->nextSibling()) {
      result.append(DumpFrameScrollPosition(child, recursive));
    }
  }
  return result;
}

}  // namespace

LayoutTestController::LayoutTestController(RenderView* render_view)
    : RenderViewObserver(render_view) {
}

LayoutTestController::~LayoutTestController() {
}

void LayoutTestController::DidFinishLoad(WebFrame* frame) {
  if (!frame->parent())
    Send(new ShellViewHostMsg_DidFinishLoad(routing_id()));
}

bool LayoutTestController::OnMessageReceived(const IPC::Message& message) {
  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP(LayoutTestController, message)
    IPC_MESSAGE_HANDLER(ShellViewMsg_CaptureTextDump, OnCaptureTextDump)
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()

  return handled;
}

void LayoutTestController::OnCaptureTextDump(bool as_text,
                                             bool printing,
                                             bool recursive) {
  WebFrame* frame = render_view()->GetWebView()->mainFrame();
  std::string dump;
  if (as_text) {
    dump = DumpFramesAsText(frame, printing, recursive);
  } else {
    WebFrame::RenderAsTextControls render_text_behavior =
        WebFrame::RenderAsTextNormal;
    if (printing)
      render_text_behavior |= WebFrame::RenderAsTextPrinting;
    dump = frame->renderTreeAsText(render_text_behavior).utf8();
    dump.append(DumpFrameScrollPosition(frame, recursive));
  }
  Send(new ShellViewHostMsg_TextDump(routing_id(), dump));
}

}  // namespace content