/*
 * Copyright (C) 2010 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:
 *
 *     * 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 of Google Inc. 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
 * OWNER 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.
 */

WebInspector.DebuggerModel = function()
{
    this._paused = false;
    this._callFrames = [];
    this._breakpoints = {};
    this._sourceIDAndLineToBreakpointId = {};
    this._scripts = {};

    InspectorBackend.registerDomainDispatcher("Debugger", new WebInspector.DebuggerDispatcher(this));
}

WebInspector.DebuggerModel.Events = {
    DebuggerPaused: "debugger-paused",
    DebuggerResumed: "debugger-resumed",
    ParsedScriptSource: "parsed-script-source",
    FailedToParseScriptSource: "failed-to-parse-script-source",
    ScriptSourceChanged: "script-source-changed",
    BreakpointAdded: "breakpoint-added",
    BreakpointRemoved: "breakpoint-removed"
}

WebInspector.DebuggerModel.prototype = {
    continueToLine: function(sourceID, lineNumber)
    {
        function didSetBreakpoint(breakpointId, actualLineNumber)
        {
            if (!breakpointId)
                return;
            if (this.findBreakpoint(sourceID, actualLineNumber)) {
                InspectorBackend.removeBreakpoint(breakpointId);
                return;
            }
            if ("_continueToLineBreakpointId" in this)
                InspectorBackend.removeBreakpoint(this._continueToLineBreakpointId);
            this._continueToLineBreakpointId = breakpointId;
        }
        InspectorBackend.setBreakpoint(sourceID, lineNumber, "", true, didSetBreakpoint.bind(this));
        if (this._paused)
            InspectorBackend.resume();
    },

    setBreakpoint: function(sourceID, lineNumber, enabled, condition)
    {
        function didSetBreakpoint(breakpointId, actualLineNumber)
        {
            if (breakpointId)
                this._breakpointSetOnBackend(breakpointId, sourceID, actualLineNumber, condition, enabled, lineNumber, false);
        }
        InspectorBackend.setBreakpoint(sourceID, lineNumber, condition, enabled, didSetBreakpoint.bind(this));
    },

    removeBreakpoint: function(breakpointId)
    {
        InspectorBackend.removeBreakpoint(breakpointId);
        var breakpoint = this._breakpoints[breakpointId];
        delete this._breakpoints[breakpointId];
        delete this._sourceIDAndLineToBreakpointId[this._encodeSourceIDAndLine(breakpoint.sourceID, breakpoint.line)];
        this.dispatchEventToListeners(WebInspector.DebuggerModel.Events.BreakpointRemoved, breakpointId);
        breakpoint.dispatchEventToListeners("removed");
    },

    _breakpointSetOnBackend: function(breakpointId, sourceID, lineNumber, condition, enabled, originalLineNumber, restored)
    {
        var sourceIDAndLine = this._encodeSourceIDAndLine(sourceID, lineNumber);
        if (sourceIDAndLine in this._sourceIDAndLineToBreakpointId) {
            InspectorBackend.removeBreakpoint(breakpointId);
            return;
        }

        var url = this._scripts[sourceID].sourceURL;
        var breakpoint = new WebInspector.Breakpoint(this, breakpointId, sourceID, url, lineNumber, enabled, condition);
        breakpoint.restored = restored;
        breakpoint.originalLineNumber = originalLineNumber;
        this._breakpoints[breakpointId] = breakpoint;
        this._sourceIDAndLineToBreakpointId[sourceIDAndLine] = breakpointId;
        this.dispatchEventToListeners(WebInspector.DebuggerModel.Events.BreakpointAdded, breakpoint);
    },

    breakpointForId: function(breakpointId)
    {
        return this._breakpoints[breakpointId];
    },

    queryBreakpoints: function(filter)
    {
        var breakpoints = [];
        for (var id in this._breakpoints) {
           var breakpoint = this._breakpoints[id];
           if (filter(breakpoint))
               breakpoints.push(breakpoint);
        }
        return breakpoints;
    },

    findBreakpoint: function(sourceID, lineNumber)
    {
        var sourceIDAndLine = this._encodeSourceIDAndLine(sourceID, lineNumber);
        var breakpointId = this._sourceIDAndLineToBreakpointId[sourceIDAndLine];
        return this._breakpoints[breakpointId];
    },

    _encodeSourceIDAndLine: function(sourceID, lineNumber)
    {
        return sourceID + ":" + lineNumber;
    },

    reset: function()
    {
        this._paused = false;
        this._callFrames = [];
        this._breakpoints = {};
        delete this._oneTimeBreakpoint;
        this._sourceIDAndLineToBreakpointId = {};
        this._scripts = {};
    },

    scriptForSourceID: function(sourceID)
    {
        return this._scripts[sourceID];
    },

    scriptsForURL: function(url)
    {
        return this.queryScripts(function(s) { return s.sourceURL === url; });
    },

    queryScripts: function(filter)
    {
        var scripts = [];
        for (var sourceID in this._scripts) {
            var script = this._scripts[sourceID];
            if (filter(script))
                scripts.push(script);
        }
        return scripts;
    },

    editScriptSource: function(sourceID, scriptSource)
    {
        function didEditScriptSource(success, newBodyOrErrorMessage, callFrames)
        {
            if (success) {
                if (callFrames && callFrames.length)
                    this._callFrames = callFrames;
                this._updateScriptSource(sourceID, newBodyOrErrorMessage);
            } else
                WebInspector.log(newBodyOrErrorMessage, WebInspector.ConsoleMessage.MessageLevel.Warning);
        }
        InspectorBackend.editScriptSource(sourceID, scriptSource, didEditScriptSource.bind(this));
    },

    _updateScriptSource: function(sourceID, scriptSource)
    {
        var script = this._scripts[sourceID];
        var oldSource = script.source;
        script.source = scriptSource;

        // Clear and re-create breakpoints according to text diff.
        var diff = Array.diff(oldSource.split("\n"), script.source.split("\n"));
        for (var id in this._breakpoints) {
            var breakpoint = this._breakpoints[id];
            if (breakpoint.sourceID !== sourceID)
                continue;
            breakpoint.remove();
            var lineNumber = breakpoint.line - 1;
            var newLineNumber = diff.left[lineNumber].row;
            if (newLineNumber === undefined) {
                for (var i = lineNumber - 1; i >= 0; --i) {
                    if (diff.left[i].row === undefined)
                        continue;
                    var shiftedLineNumber = diff.left[i].row + lineNumber - i;
                    if (shiftedLineNumber < diff.right.length) {
                        var originalLineNumber = diff.right[shiftedLineNumber].row;
                        if (originalLineNumber === lineNumber || originalLineNumber === undefined)
                            newLineNumber = shiftedLineNumber;
                    }
                    break;
                }
            }
            if (newLineNumber !== undefined)
                this.setBreakpoint(sourceID, newLineNumber + 1, breakpoint.enabled, breakpoint.condition);
        }

        this.dispatchEventToListeners(WebInspector.DebuggerModel.Events.ScriptSourceChanged, { sourceID: sourceID, oldSource: oldSource });
    },

    get callFrames()
    {
        return this._callFrames;
    },

    _pausedScript: function(details)
    {
        this._paused = true;
        this._callFrames = details.callFrames;
        if ("_continueToLineBreakpointId" in this) {
            InspectorBackend.removeBreakpoint(this._continueToLineBreakpointId);
            delete this._continueToLineBreakpointId;
        }
        this.dispatchEventToListeners(WebInspector.DebuggerModel.Events.DebuggerPaused, details);
    },

    _resumedScript: function()
    {
        this._paused = false;
        this._callFrames = [];
        this.dispatchEventToListeners(WebInspector.DebuggerModel.Events.DebuggerResumed);
    },

    _parsedScriptSource: function(sourceID, sourceURL, lineOffset, columnOffset, length, scriptWorldType)
    {
        var script = new WebInspector.Script(sourceID, sourceURL, "", lineOffset, columnOffset, length, undefined, undefined, scriptWorldType);
        this._scripts[sourceID] = script;
        this.dispatchEventToListeners(WebInspector.DebuggerModel.Events.ParsedScriptSource, sourceID);
    },

    _failedToParseScriptSource: function(sourceURL, source, startingLine, errorLine, errorMessage)
    {
        var script = new WebInspector.Script(null, sourceURL, source, startingLine, errorLine, errorMessage, undefined);
        this.dispatchEventToListeners(WebInspector.DebuggerModel.Events.FailedToParseScriptSource, script);
    }
}

WebInspector.DebuggerModel.prototype.__proto__ = WebInspector.Object.prototype;

WebInspector.DebuggerEventTypes = {
    JavaScriptPause: 0,
    JavaScriptBreakpoint: 1,
    NativeBreakpoint: 2
};

WebInspector.DebuggerDispatcher = function(debuggerModel)
{
    this._debuggerModel = debuggerModel;
}

WebInspector.DebuggerDispatcher.prototype = {
    pausedScript: function(details)
    {
        this._debuggerModel._pausedScript(details);
    },

    resumedScript: function()
    {
        this._debuggerModel._resumedScript();
    },

    debuggerWasEnabled: function()
    {
        WebInspector.panels.scripts.debuggerWasEnabled();
    },

    debuggerWasDisabled: function()
    {
        WebInspector.panels.scripts.debuggerWasDisabled();
    },

    parsedScriptSource: function(sourceID, sourceURL, lineOffset, columnOffset, length, scriptWorldType)
    {
        this._debuggerModel._parsedScriptSource(sourceID, sourceURL, lineOffset, columnOffset, length, scriptWorldType);
    },

    failedToParseScriptSource: function(sourceURL, source, startingLine, errorLine, errorMessage)
    {
        this._debuggerModel._failedToParseScriptSource(sourceURL, source, startingLine, errorLine, errorMessage);
    },

    breakpointResolved: function(breakpointId, sourceID, lineNumber, condition, enabled, originalLineNumber)
    {
        this._debuggerModel._breakpointSetOnBackend(breakpointId, sourceID, lineNumber, condition, enabled, originalLineNumber, true);
    },

    didCreateWorker: function()
    {
        var workersPane = WebInspector.panels.scripts.sidebarPanes.workers;
        workersPane.addWorker.apply(workersPane, arguments);
    },

    didDestroyWorker: function()
    {
        var workersPane = WebInspector.panels.scripts.sidebarPanes.workers;
        workersPane.removeWorker.apply(workersPane, arguments);
    }
}