/*
 * Copyright (C) 2011 Google 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 GOOGLE 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 GOOGLE 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.
 */

/**
 * @interface
 */
WebInspector.TabbedEditorContainerDelegate = function() { }

WebInspector.TabbedEditorContainerDelegate.prototype = {
    /**
     * @param {!WebInspector.UISourceCode} uiSourceCode
     * @return {!WebInspector.SourceFrame}
     */
    viewForFile: function(uiSourceCode) { }
}

/**
 * @constructor
 * @extends {WebInspector.Object}
 * @param {!WebInspector.TabbedEditorContainerDelegate} delegate
 * @param {string} settingName
 * @param {string} placeholderText
 */
WebInspector.TabbedEditorContainer = function(delegate, settingName, placeholderText)
{
    WebInspector.Object.call(this);
    this._delegate = delegate;

    this._tabbedPane = new WebInspector.TabbedPane();
    this._tabbedPane.setPlaceholderText(placeholderText);
    this._tabbedPane.setTabDelegate(new WebInspector.EditorContainerTabDelegate(this));

    this._tabbedPane.closeableTabs = true;
    this._tabbedPane.element.id = "sources-editor-container-tabbed-pane";

    this._tabbedPane.addEventListener(WebInspector.TabbedPane.EventTypes.TabClosed, this._tabClosed, this);
    this._tabbedPane.addEventListener(WebInspector.TabbedPane.EventTypes.TabSelected, this._tabSelected, this);

    this._tabIds = new Map();
    this._files = {};

    this._previouslyViewedFilesSetting = WebInspector.settings.createSetting(settingName, []);
    this._history = WebInspector.TabbedEditorContainer.History.fromObject(this._previouslyViewedFilesSetting.get());
}

WebInspector.TabbedEditorContainer.Events = {
    EditorSelected: "EditorSelected",
    EditorClosed: "EditorClosed"
}

WebInspector.TabbedEditorContainer._tabId = 0;

WebInspector.TabbedEditorContainer.maximalPreviouslyViewedFilesCount = 30;

WebInspector.TabbedEditorContainer.prototype = {
    /**
     * @return {!WebInspector.View}
     */
    get view()
    {
        return this._tabbedPane;
    },

    /**
     * @type {!WebInspector.SourceFrame}
     */
    get visibleView()
    {
        return this._tabbedPane.visibleView;
    },

    /**
     * @param {!Element} parentElement
     */
    show: function(parentElement)
    {
        this._tabbedPane.show(parentElement);
    },

    /**
     * @param {!WebInspector.UISourceCode} uiSourceCode
     */
    showFile: function(uiSourceCode)
    {
        this._innerShowFile(uiSourceCode, true);
    },

    /**
     * @param {!WebInspector.UISourceCode} uiSourceCode
     */
    closeFile: function(uiSourceCode)
    {
        var tabId = this._tabIds.get(uiSourceCode);
        if (!tabId)
            return;
        this._closeTabs([tabId]);
    },

    /**
     * @return {!Array.<!WebInspector.UISourceCode>}
     */
    historyUISourceCodes: function()
    {
        // FIXME: there should be a way to fetch UISourceCode for its uri.
        var uriToUISourceCode = {};
        for (var id in this._files) {
            var uiSourceCode = this._files[id];
            uriToUISourceCode[uiSourceCode.uri()] = uiSourceCode;
        }

        var result = [];
        var uris = this._history._urls();
        for (var i = 0; i < uris.length; ++i) {
            var uiSourceCode = uriToUISourceCode[uris[i]];
            if (uiSourceCode)
                result.push(uiSourceCode);
        }
        return result;
    },

    _addScrollAndSelectionListeners: function()
    {
        if (!this._currentView)
            return;
        this._currentView.addEventListener(WebInspector.SourceFrame.Events.ScrollChanged, this._scrollChanged, this);
        this._currentView.addEventListener(WebInspector.SourceFrame.Events.SelectionChanged, this._selectionChanged, this);
    },

    _removeScrollAndSelectionListeners: function()
    {
        if (!this._currentView)
            return;
        this._currentView.removeEventListener(WebInspector.SourceFrame.Events.ScrollChanged, this._scrollChanged, this);
        this._currentView.removeEventListener(WebInspector.SourceFrame.Events.SelectionChanged, this._selectionChanged, this);
    },

    _scrollChanged: function(event)
    {
        var lineNumber = /** @type {number} */ (event.data);
        this._history.updateScrollLineNumber(this._currentFile.uri(), lineNumber);
        this._history.save(this._previouslyViewedFilesSetting);
    },

    _selectionChanged: function(event)
    {
        var range = /** @type {!WebInspector.TextRange} */ (event.data);
        this._history.updateSelectionRange(this._currentFile.uri(), range);
        this._history.save(this._previouslyViewedFilesSetting);
    },

    /**
     * @param {!WebInspector.UISourceCode} uiSourceCode
     * @param {boolean=} userGesture
     */
    _innerShowFile: function(uiSourceCode, userGesture)
    {
        if (this._currentFile === uiSourceCode)
            return;

        this._removeScrollAndSelectionListeners();
        this._currentFile = uiSourceCode;

        var tabId = this._tabIds.get(uiSourceCode) || this._appendFileTab(uiSourceCode, userGesture);
        
        this._tabbedPane.selectTab(tabId, userGesture);
        if (userGesture)
            this._editorSelectedByUserAction();
        
        this._currentView = this.visibleView;
        this._addScrollAndSelectionListeners();

        var eventData = { currentFile: this._currentFile, userGesture: userGesture };
        this.dispatchEventToListeners(WebInspector.TabbedEditorContainer.Events.EditorSelected, eventData);
    },

    /**
     * @param {!WebInspector.UISourceCode} uiSourceCode
     * @return {string}
     */
    _titleForFile: function(uiSourceCode)
    {
        var maxDisplayNameLength = 30;
        var title = uiSourceCode.displayName(true).trimMiddle(maxDisplayNameLength);
        if (uiSourceCode.isDirty() || uiSourceCode.hasUnsavedCommittedChanges())
            title += "*";
        return title;
    },

    /**
     * @param {string} id
     * @param {string} nextTabId
     */
    _maybeCloseTab: function(id, nextTabId)
    {
        var uiSourceCode = this._files[id];
        var shouldPrompt = uiSourceCode.isDirty() && uiSourceCode.project().canSetFileContent();
        // FIXME: this should be replaced with common Save/Discard/Cancel dialog.
        if (!shouldPrompt || confirm(WebInspector.UIString("Are you sure you want to close unsaved file: %s?", uiSourceCode.name()))) {
            uiSourceCode.resetWorkingCopy();
            if (nextTabId)
                this._tabbedPane.selectTab(nextTabId, true);
            this._tabbedPane.closeTab(id, true);
            return true;
        }
        return false;
    },

    /**
     * @param {!Array.<string>} ids
     */
    _closeTabs: function(ids)
    {
        var dirtyTabs = [];
        var cleanTabs = [];
        for (var i = 0; i < ids.length; ++i) {
            var id = ids[i];
            var uiSourceCode = this._files[id];
            if (uiSourceCode.isDirty())
                dirtyTabs.push(id);
            else
                cleanTabs.push(id);
        }
        if (dirtyTabs.length)
            this._tabbedPane.selectTab(dirtyTabs[0], true);
        this._tabbedPane.closeTabs(cleanTabs, true);
        for (var i = 0; i < dirtyTabs.length; ++i) {
            var nextTabId = i + 1 < dirtyTabs.length ? dirtyTabs[i + 1] : null;
            if (!this._maybeCloseTab(dirtyTabs[i], nextTabId))
                break;
        }
    },

    /**
     * @param {!WebInspector.UISourceCode} uiSourceCode
     */
    addUISourceCode: function(uiSourceCode)
    {
        var uri = uiSourceCode.uri();
        if (this._userSelectedFiles)
            return;

        var index = this._history.index(uri)
        if (index === -1)
            return;

        var tabId = this._tabIds.get(uiSourceCode) || this._appendFileTab(uiSourceCode, false);

        if (!this._currentFile)
            return;

        // Select tab if this file was the last to be shown.
        if (!index) {
            this._innerShowFile(uiSourceCode, false);
            return;
        }

        var currentProjectType = this._currentFile.project().type();
        var addedProjectType = uiSourceCode.project().type();
        var snippetsProjectType = WebInspector.projectTypes.Snippets;
        if (this._history.index(this._currentFile.uri()) && currentProjectType === snippetsProjectType && addedProjectType !== snippetsProjectType)
            this._innerShowFile(uiSourceCode, false);
    },

    /**
     * @param {!WebInspector.UISourceCode} uiSourceCode
     */
    removeUISourceCode: function(uiSourceCode)
    {
        this.removeUISourceCodes([uiSourceCode]);
    },

    /**
     * @param {!Array.<!WebInspector.UISourceCode>} uiSourceCodes
     */
    removeUISourceCodes: function(uiSourceCodes)
    {
        var tabIds = [];
        for (var i = 0; i < uiSourceCodes.length; ++i) {
            var uiSourceCode = uiSourceCodes[i];
            var tabId = this._tabIds.get(uiSourceCode);
            if (tabId)
                tabIds.push(tabId);
        }
        this._tabbedPane.closeTabs(tabIds);
    },

    /**
     * @param {!WebInspector.UISourceCode} uiSourceCode
     */
    _editorClosedByUserAction: function(uiSourceCode)
    {
        this._userSelectedFiles = true;
        this._history.remove(uiSourceCode.uri());
        this._updateHistory();
    },

    _editorSelectedByUserAction: function()
    {
        this._userSelectedFiles = true;
        this._updateHistory();
    },

    _updateHistory: function()
    {
        var tabIds = this._tabbedPane.lastOpenedTabIds(WebInspector.TabbedEditorContainer.maximalPreviouslyViewedFilesCount);

        /**
         * @param {string} tabId
         * @this {WebInspector.TabbedEditorContainer}
         */
        function tabIdToURI(tabId)
        {
            return this._files[tabId].uri();
        }
        
        this._history.update(tabIds.map(tabIdToURI.bind(this)));
        this._history.save(this._previouslyViewedFilesSetting);
    },

    /**
     * @param {!WebInspector.UISourceCode} uiSourceCode
     * @return {string}
     */
    _tooltipForFile: function(uiSourceCode)
    {
        return uiSourceCode.originURL();
    },

    /**
     * @param {!WebInspector.UISourceCode} uiSourceCode
     * @param {boolean=} userGesture
     * @return {string}
     */
    _appendFileTab: function(uiSourceCode, userGesture)
    {
        var view = this._delegate.viewForFile(uiSourceCode);
        var title = this._titleForFile(uiSourceCode);
        var tooltip = this._tooltipForFile(uiSourceCode);

        var tabId = this._generateTabId();
        this._tabIds.put(uiSourceCode, tabId);
        this._files[tabId] = uiSourceCode;

        var savedSelectionRange = this._history.selectionRange(uiSourceCode.uri());
        if (savedSelectionRange)
            view.setSelection(savedSelectionRange);
        var savedScrollLineNumber = this._history.scrollLineNumber(uiSourceCode.uri());
        if (savedScrollLineNumber)
            view.scrollToLine(savedScrollLineNumber);

        this._tabbedPane.appendTab(tabId, title, view, tooltip, userGesture);

        this._updateFileTitle(uiSourceCode);
        this._addUISourceCodeListeners(uiSourceCode);
        return tabId;
    },

    /**
     * @param {!WebInspector.Event} event
     */
    _tabClosed: function(event)
    {
        var tabId = /** @type {string} */ (event.data.tabId);
        var userGesture = /** @type {boolean} */ (event.data.isUserGesture);

        var uiSourceCode = this._files[tabId];
        if (this._currentFile === uiSourceCode) {
            this._removeScrollAndSelectionListeners();
            delete this._currentView;
            delete this._currentFile;
        }
        this._tabIds.remove(uiSourceCode);
        delete this._files[tabId];

        this._removeUISourceCodeListeners(uiSourceCode);

        this.dispatchEventToListeners(WebInspector.TabbedEditorContainer.Events.EditorClosed, uiSourceCode);

        if (userGesture)
            this._editorClosedByUserAction(uiSourceCode);
    },

    /**
     * @param {!WebInspector.Event} event
     */
    _tabSelected: function(event)
    {
        var tabId = /** @type {string} */ (event.data.tabId);
        var userGesture = /** @type {boolean} */ (event.data.isUserGesture);

        var uiSourceCode = this._files[tabId];
        this._innerShowFile(uiSourceCode, userGesture);
    },

    /**
     * @param {!WebInspector.UISourceCode} uiSourceCode
     */
    _addUISourceCodeListeners: function(uiSourceCode)
    {
        uiSourceCode.addEventListener(WebInspector.UISourceCode.Events.TitleChanged, this._uiSourceCodeTitleChanged, this);
        uiSourceCode.addEventListener(WebInspector.UISourceCode.Events.WorkingCopyChanged, this._uiSourceCodeWorkingCopyChanged, this);
        uiSourceCode.addEventListener(WebInspector.UISourceCode.Events.WorkingCopyCommitted, this._uiSourceCodeWorkingCopyCommitted, this);
        uiSourceCode.addEventListener(WebInspector.UISourceCode.Events.SavedStateUpdated, this._uiSourceCodeSavedStateUpdated, this);
    },

    /**
     * @param {!WebInspector.UISourceCode} uiSourceCode
     */
    _removeUISourceCodeListeners: function(uiSourceCode)
    {
        uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.TitleChanged, this._uiSourceCodeTitleChanged, this);
        uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.WorkingCopyChanged, this._uiSourceCodeWorkingCopyChanged, this);
        uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.WorkingCopyCommitted, this._uiSourceCodeWorkingCopyCommitted, this);
        uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.SavedStateUpdated, this._uiSourceCodeSavedStateUpdated, this);
    },

    /**
     * @param {!WebInspector.UISourceCode} uiSourceCode
     */
    _updateFileTitle: function(uiSourceCode)
    {
        var tabId = this._tabIds.get(uiSourceCode);
        if (tabId) {
            var title = this._titleForFile(uiSourceCode);
            this._tabbedPane.changeTabTitle(tabId, title);
            if (uiSourceCode.hasUnsavedCommittedChanges())
                this._tabbedPane.setTabIcon(tabId, "editor-container-unsaved-committed-changes-icon", WebInspector.UIString("Changes to this file were not saved to file system."));
            else
                this._tabbedPane.setTabIcon(tabId, "");
        }
    },

    _uiSourceCodeTitleChanged: function(event)
    {
        var uiSourceCode = /** @type {!WebInspector.UISourceCode} */ (event.target);
        this._updateFileTitle(uiSourceCode);
        this._updateHistory();
    },

    _uiSourceCodeWorkingCopyChanged: function(event)
    {
        var uiSourceCode = /** @type {!WebInspector.UISourceCode} */ (event.target);
        this._updateFileTitle(uiSourceCode);
    },

    _uiSourceCodeWorkingCopyCommitted: function(event)
    {
        var uiSourceCode = /** @type {!WebInspector.UISourceCode} */ (event.target);
        this._updateFileTitle(uiSourceCode);
    },

    _uiSourceCodeSavedStateUpdated: function(event)
    {
        var uiSourceCode = /** @type {!WebInspector.UISourceCode} */ (event.target);
        this._updateFileTitle(uiSourceCode);
    },

    reset: function()
    {
        delete this._userSelectedFiles;
    },

    /**
     * @return {string}
     */
    _generateTabId: function()
    {
        return "tab_" + (WebInspector.TabbedEditorContainer._tabId++);
    },

    /**
     * @return {!WebInspector.UISourceCode} uiSourceCode
     */
    currentFile: function()
    {
        return this._currentFile;
    },

    __proto__: WebInspector.Object.prototype
}

/**
 * @constructor
 * @param {string} url
 * @param {!WebInspector.TextRange=} selectionRange
 * @param {number=} scrollLineNumber
 */
WebInspector.TabbedEditorContainer.HistoryItem = function(url, selectionRange, scrollLineNumber)
{
    /** @const */ this.url = url;
    /** @const */ this._isSerializable = url.length < WebInspector.TabbedEditorContainer.HistoryItem.serializableUrlLengthLimit;
    this.selectionRange = selectionRange;
    this.scrollLineNumber = scrollLineNumber;
}

WebInspector.TabbedEditorContainer.HistoryItem.serializableUrlLengthLimit = 4096;

/**
 * @param {!Object} serializedHistoryItem
 * @return {!WebInspector.TabbedEditorContainer.HistoryItem}
 */
WebInspector.TabbedEditorContainer.HistoryItem.fromObject = function (serializedHistoryItem)
{
    var selectionRange = serializedHistoryItem.selectionRange ? WebInspector.TextRange.fromObject(serializedHistoryItem.selectionRange) : undefined;
    return new WebInspector.TabbedEditorContainer.HistoryItem(serializedHistoryItem.url, selectionRange, serializedHistoryItem.scrollLineNumber);
}

WebInspector.TabbedEditorContainer.HistoryItem.prototype = {
    /**
     * @return {?Object}
     */
    serializeToObject: function()
    {
        if (!this._isSerializable)
            return null;
        var serializedHistoryItem = {};
        serializedHistoryItem.url = this.url;
        serializedHistoryItem.selectionRange = this.selectionRange;
        serializedHistoryItem.scrollLineNumber = this.scrollLineNumber;
        return serializedHistoryItem;
    }
}

/**
 * @constructor
 * @param {!Array.<!WebInspector.TabbedEditorContainer.HistoryItem>} items
 */
WebInspector.TabbedEditorContainer.History = function(items)
{
    this._items = items;
    this._rebuildItemIndex();
}

/**
 * @param {!Array.<!Object>} serializedHistory
 * @return {!WebInspector.TabbedEditorContainer.History}
 */
WebInspector.TabbedEditorContainer.History.fromObject = function(serializedHistory)
{
    var items = [];
    for (var i = 0; i < serializedHistory.length; ++i)
        items.push(WebInspector.TabbedEditorContainer.HistoryItem.fromObject(serializedHistory[i]));
    return new WebInspector.TabbedEditorContainer.History(items);
}

WebInspector.TabbedEditorContainer.History.prototype = {
    /**
     * @param {string} url
     * @return {number}
     */
    index: function(url)
    {
        var index = this._itemsIndex[url];
        if (typeof index === "number")
            return index;
        return -1;
    },

    _rebuildItemIndex: function()
    {
        this._itemsIndex = {};
        for (var i = 0; i < this._items.length; ++i) {
            console.assert(!this._itemsIndex.hasOwnProperty(this._items[i].url));
            this._itemsIndex[this._items[i].url] = i;
        }
    },

    /**
     * @param {string} url
     * @return {!WebInspector.TextRange|undefined}
     */
    selectionRange: function(url)
    {
        var index = this.index(url);
        return index !== -1 ? this._items[index].selectionRange : undefined;
    },

    /**
     * @param {string} url
     * @param {!WebInspector.TextRange=} selectionRange
     */
    updateSelectionRange: function(url, selectionRange)
    {
        if (!selectionRange)
            return;
        var index = this.index(url);
        if (index === -1)
            return;
        this._items[index].selectionRange = selectionRange;
    },

    /**
     * @param {string} url
     * @return {number|undefined}
     */
    scrollLineNumber: function(url)
    {
        var index = this.index(url);
        return index !== -1 ? this._items[index].scrollLineNumber : undefined;
    },

    /**
     * @param {string} url
     * @param {number} scrollLineNumber
     */
    updateScrollLineNumber: function(url, scrollLineNumber)
    {
        var index = this.index(url);
        if (index === -1)
            return;
        this._items[index].scrollLineNumber = scrollLineNumber;
    },

    /**
     * @param {!Array.<string>} urls
     */
    update: function(urls)
    {
        for (var i = urls.length - 1; i >= 0; --i) {
            var index = this.index(urls[i]);
            var item;
            if (index !== -1) {
                item = this._items[index];
                this._items.splice(index, 1);
            } else
                item = new WebInspector.TabbedEditorContainer.HistoryItem(urls[i]);
            this._items.unshift(item);
            this._rebuildItemIndex();
        }
    },

    /**
     * @param {string} url
     */
    remove: function(url)
    {
        var index = this.index(url);
        if (index !== -1) {
            this._items.splice(index, 1);
            this._rebuildItemIndex();
        }
    },
    
    /**
     * @param {!WebInspector.Setting} setting
     */
    save: function(setting)
    {
        setting.set(this._serializeToObject());
    },
    
    /**
     * @return {!Array.<!Object>}
     */
    _serializeToObject: function()
    {
        var serializedHistory = [];
        for (var i = 0; i < this._items.length; ++i) {
            var serializedItem = this._items[i].serializeToObject();
            if (serializedItem)
                serializedHistory.push(serializedItem);
            if (serializedHistory.length === WebInspector.TabbedEditorContainer.maximalPreviouslyViewedFilesCount)
                break;
        }
        return serializedHistory;
    },


    /**
     * @return {!Array.<string>}
     */
    _urls: function()
    {
        var result = [];
        for (var i = 0; i < this._items.length; ++i)
            result.push(this._items[i].url);
        return result;
    }
}

/**
 * @constructor
 * @implements {WebInspector.TabbedPaneTabDelegate}
 * @param {!WebInspector.TabbedEditorContainer} editorContainer
 */
WebInspector.EditorContainerTabDelegate = function(editorContainer)
{
    this._editorContainer = editorContainer;
}

WebInspector.EditorContainerTabDelegate.prototype = {
    /**
     * @param {!WebInspector.TabbedPane} tabbedPane
     * @param {!Array.<string>} ids
     */
    closeTabs: function(tabbedPane, ids)
    {
        this._editorContainer._closeTabs(ids);
    }
}
