/*
 * Copyright (C) 2016 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
 */

WI.ThreadTreeElement = class ThreadTreeElement extends WI.GeneralTreeElement
{
    constructor(target)
    {
        super("thread", target.displayName);

        this._target = target;

        this._idleTreeElement = new WI.IdleTreeElement;
    }

    // Public

    get target() { return this._target; }

    refresh()
    {
        this.removeChildren();

        this._updateStatus();

        let targetData = WI.debuggerManager.dataForTarget(this._target);
        let callFrames = targetData.callFrames;

        if (targetData.pausing || !callFrames.length) {
            this.appendChild(this._idleTreeElement);
            this.expand();
            return;
        }

        let activeCallFrame = WI.debuggerManager.activeCallFrame;
        let activeCallFrameTreeElement = null;

        let renderCallFrames = (callFrames, shouldSelectActiveFrame) => {
            let blackboxedCallFrameGroupStartIndex = undefined;

            // Add one extra iteration to handle call stacks that start blackboxed.
            for (let i = 0; i < callFrames.length + 1; ++i) {
                let callFrame = callFrames[i];

                if (callFrame?.blackboxed && WI.settings.experimentalCollapseBlackboxedCallFrames.value) {
                    blackboxedCallFrameGroupStartIndex ??= i;
                    continue;
                }

                if (blackboxedCallFrameGroupStartIndex !== undefined) {
                    let blackboxedCallFrameGroup = callFrames.slice(blackboxedCallFrameGroupStartIndex, i);
                    blackboxedCallFrameGroupStartIndex = undefined;

                    if (!WI.debuggerManager.shouldAutoExpandBlackboxedCallFrameGroup(blackboxedCallFrameGroup)) {
                        this.appendChild(new WI.BlackboxedGroupTreeElement(blackboxedCallFrameGroup));
                        continue;
                    }

                    for (let blackboxedCallFrame of blackboxedCallFrameGroup)
                        this.appendChild(new WI.CallFrameTreeElement(blackboxedCallFrame));
                }

                if (!callFrame)
                    continue;

                let callFrameTreeElement = new WI.CallFrameTreeElement(callFrame);
                if (shouldSelectActiveFrame && callFrame === activeCallFrame)
                    activeCallFrameTreeElement = callFrameTreeElement;
                this.appendChild(callFrameTreeElement);
            }
        };

        renderCallFrames(callFrames, true);

        if (activeCallFrameTreeElement) {
            activeCallFrameTreeElement.select(true, true);
            activeCallFrameTreeElement.isActiveCallFrame = true;
        }

        let currentStackTrace = targetData.asyncStackTrace;
        while (currentStackTrace) {
            console.assert(currentStackTrace.callFrames.length, "StackTrace should have non-empty call frames array.");
            if (!currentStackTrace.callFrames.length)
                break;

            let boundaryCallFrame;
            if (currentStackTrace.topCallFrameIsBoundary) {
                boundaryCallFrame = currentStackTrace.callFrames[0];
                console.assert(boundaryCallFrame.nativeCode && !boundaryCallFrame.sourceCodeLocation);
            } else {
                // Create a generic native CallFrame for the asynchronous boundary.
                const functionName = WI.UIString("(async)");
                const nativeCode = true;
                boundaryCallFrame = new WI.CallFrame(null, null, null, functionName, null, null, nativeCode);
            }

            const isAsyncBoundaryCallFrame = true;
            this.appendChild(new WI.CallFrameTreeElement(boundaryCallFrame, isAsyncBoundaryCallFrame));

            let startIndex = currentStackTrace.topCallFrameIsBoundary ? 1 : 0;
            renderCallFrames(startIndex ? currentStackTrace.callFrames.slice(startIndex) : currentStackTrace.callFrames);

            if (currentStackTrace.truncated) {
                let truncatedTreeElement = new WI.GeneralTreeElement("truncated-call-frames", WI.UIString("Call Frames Truncated"));
                truncatedTreeElement.selectable = false;
                this.appendChild(truncatedTreeElement);
            }

            currentStackTrace = currentStackTrace.parentStackTrace;
        }

        this.expand();
    }

    // Protected (GeneralTreeElement)

    onattach()
    {
        super.onattach();

        this.refresh();
        this.expand();
    }

    populateContextMenu(contextMenu, event)
    {
        let targetData = WI.debuggerManager.dataForTarget(this._target);

        contextMenu.appendItem(WI.UIString("Resume Thread"), () => {
            WI.debuggerManager.continueUntilNextRunLoop(this._target);
        }, !targetData.paused);

        super.populateContextMenu(contextMenu, event);
    }

    // Private

    _updateStatus()
    {
        this.status = null;

        if (!this.element)
            return;

        let targetData = WI.debuggerManager.dataForTarget(this._target);
        if (!targetData.paused)
            return;

        if (!this._statusButton) {
            let tooltip = WI.UIString("Resume Thread");
            this._statusButton = new WI.TreeElementStatusButton(WI.ImageUtilities.useSVGSymbol("Images/Resume.svg", "resume", tooltip));
            this._statusButton.addEventListener(WI.TreeElementStatusButton.Event.Clicked, function(event) {
                WI.debuggerManager.continueUntilNextRunLoop(this._target);
            }, this);
            this._statusButton.element.addEventListener("mousedown", (event) => {
                // Prevent tree element from being selected.
                event.stopPropagation();
            });
        }

        this.status = this._statusButton.element;
    }
};
