/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Dan Mosedale <dmose@mozilla.org>
 *   Myk Melez <myk@mozilla.org>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

interface nsIURI;
interface nsIFile;
interface nsIUTF8StringEnumerator;
interface nsIHandlerApp;
interface nsIMutableArray;
interface nsIInterfaceRequestor;

typedef long nsHandlerInfoAction;

/**
 * nsIHandlerInfo gives access to the information about how a given protocol
 * scheme or MIME-type is handled.
 */
[scriptable, uuid(325e56a7-3762-4312-aec7-f1fcf84b4145)]
interface nsIHandlerInfo : nsISupports {
    /**
     * The type of this handler info.  For MIME handlers, this is the MIME type.
     * For protocol handlers, it's the scheme.
     * 
     * @return String representing the type.
     */
    readonly attribute ACString type;

    /**
     * A human readable description of the handler type
     */
    attribute AString description;

    /**
     * The application the user has said they want associated with this content
     * type. This is not always guaranteed to be set!!
     */
    attribute nsIHandlerApp preferredApplicationHandler;

    /**
     * Applications that can handle this content type.
     *
     * The list will include the preferred handler, if any.  Elements of this
     * array are nsIHandlerApp objects, and this attribute will always reference
     * an array, whether or not there are any possible handlers.  If there are
     * no possible handlers, the array will contain no elements, so just check
     * its length (nsIArray::length) to see if there are any possible handlers.
     */
    readonly attribute nsIMutableArray possibleApplicationHandlers;

    /**
     * Indicates whether a default application handler exists,
     * i.e. whether launchWithFile with action = useSystemDefault is possible
     * and defaultDescription will contain usable information.
     */
    readonly attribute boolean hasDefaultHandler;

    /**
     * A pretty name description of the associated default application. Only
     * usable if hasDefaultHandler is true.
     */
    readonly attribute AString defaultDescription;

    /**
     * Launches the application with the specified URI, in a way that
     * depends on the value of preferredAction. preferredAction must be
     * useHelperApp or useSystemDefault.
     *  
     * @note Only the URI scheme is used to determine how to launch.  This is
     * essentially a pass-by-value operation.  This means that in the case of
     * a file: URI, the handler that is registered for file: will be launched
     * and our code will not make any decision based on the content-type or
     * extension, though the invoked file: handler is free to do so. 
     *
     * @param aURI
     *        The URI to launch this application with
     *
     * @param aWindowContext 
     *        The window to parent the dialog against, and, if a web handler
     *        is chosen, it is loaded in this window as well.  This parameter
     *        may be ultimately passed nsIURILoader.openURI in the case of a
     *        web handler, and aWindowContext is null or not present, web
     *        handlers will fail.  We need to do better than that; bug 394483
     *        filed in order to track.
     *       
     * @throw NS_ERROR_INVALID_ARG if preferredAction is not valid for this
     * call. Other exceptions may be thrown.
     */
    void launchWithURI(in nsIURI aURI, 
                       [optional] in nsIInterfaceRequestor aWindowContext);

    /**
     * preferredAction is how the user specified they would like to handle
     * this content type: save to disk, use specified helper app, use OS
     * default handler or handle using navigator; possible value constants
     * listed below
     */
    attribute nsHandlerInfoAction preferredAction;

    const long saveToDisk = 0;
    /**
     * Used to indicate that we know nothing about what to do with this.  You
     * could consider this to be not initialized.
     */
    const long alwaysAsk = 1;
    const long useHelperApp = 2;
    const long handleInternally = 3;
    const long useSystemDefault = 4;

    /**
     * alwaysAskBeforeHandling: if true, we should always give the user a
     * dialog asking how to dispose of this content.
     */
    attribute boolean alwaysAskBeforeHandling;
};

/**
 * nsIMIMEInfo extends nsIHandlerInfo with a bunch of information specific to
 * MIME content-types. There is a one-to-many relationship between MIME types
 * and file extensions. This means that a MIMEInfo object may have multiple
 * file extensions associated with it.  However, the reverse is not true.
 *
 * MIMEInfo objects are generally retrieved from the MIME Service
 * @see nsIMIMEService
 */
[scriptable, uuid(a4011016-81a1-47d9-b01e-19a2272ae89b)]
interface nsIMIMEInfo : nsIHandlerInfo {
    /**
     * Gives you an array of file types associated with this type.
     *
     * @return Number of elements in the array.
     * @return Array of extensions.
     */
    nsIUTF8StringEnumerator getFileExtensions();

    /**
     * Set File Extensions. Input is a comma delimited list of extensions.
     */
    void setFileExtensions(in AUTF8String aExtensions);
 
    /**
     * Returns whether or not the given extension is
     * associated with this MIME info.
     *
     * @return TRUE if the association exists. 
     */
    boolean extensionExists(in AUTF8String aExtension);

    /**
     * Append a given extension to the set of extensions
     */
    void appendExtension(in AUTF8String aExtension);

    /**
     * Returns the first extension association in
     * the internal set of extensions.
     *
     * @return The first extension.
     */
    attribute AUTF8String primaryExtension;
    
    /**
     * The MIME type of this MIMEInfo.
     * 
     * @return String representing the MIME type.
     * 
     * @deprecated  use nsIHandlerInfo::type instead.
     */
    readonly attribute ACString MIMEType;

    /**
     * Mac Type and creator types
     */
    attribute PRUint32 macType;
    attribute PRUint32 macCreator;

    /**
     * Returns whether or not these two nsIMIMEInfos are logically
     * equivalent.
     *
     * @returns PR_TRUE if the two are considered equal
     */
    boolean equals(in nsIMIMEInfo aMIMEInfo);

    /**
     * Launches the application with the specified file, in a way that
     * depends on the value of preferredAction. preferredAction must be
     * useHelperApp or useSystemDefault.
     *
     * @param aFile The file to launch this application with.
     *
     * @throw NS_ERROR_INVALID_ARG if action is not valid for this function.
     * Other exceptions may be thrown.
     */
    void launchWithFile(in nsIFile aFile);
};

/**
 * nsIHandlerApp represents an external application that can handle content
 * of some sort (either a MIME type or a protocol).
 *
 * FIXME: now that we've made nsIWebHandlerApp inherit from nsIHandlerApp,
 * we should also try to make nsIWebContentHandlerInfo inherit from or possibly
 * be replaced by nsIWebHandlerApp (bug 394710).
 */
[scriptable, uuid(b504f39e-d88a-4435-8e0d-e13f1070f7e7)]
interface nsIHandlerApp : nsISupports {

    /**
     * Human readable name for the handler
     */
    attribute AString name;

    /**
     * Whether or not the given handler app is logically equivalent to the
     * invokant (i.e. they represent the same app).
     * 
     * Two apps are the same if they are both either local or web handlers
     * and their executables/URI templates are the same in a string comparison.
     *
     * @param aHandlerApp the handler app to compare to the invokant
     *
     * @returns true if the two are logically equivalent, false otherwise
     */
    boolean equals(in nsIHandlerApp aHandlerApp);
};

/**
 * nsILocalHandlerApp is a local OS-level executable
 */
[scriptable, uuid(9812be73-273c-478c-8170-c3e0db08ae7c)]
interface nsILocalHandlerApp : nsIHandlerApp {

    /**
     * Pointer to the executable file used to handle content
     */
    attribute nsIFile executable;
};

/**
 * nsIWebHandlerApp is a web-based handler, as speced by the WhatWG HTML5
 * draft.  Currently, only GET-based handlers are supported.  At some point, 
 * we probably want to work with WhatWG to spec out and implement POST-based
 * handlers as well.
 */
[scriptable, uuid(7521a093-c498-45ce-b462-df7ba0d882f6)]
interface nsIWebHandlerApp : nsIHandlerApp {

    /**
     * Template used to construct the URI to GET.  Template is expected to have
     * a %s in it, and the escaped URI to be handled is inserted in place of 
     * that %s, as per the HTML5 spec.
     */
    attribute AUTF8String uriTemplate;
};
