///////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  File:   Manifest.cs
//
//  Note:   Creates and binds endpoints using a manifest.
//

using System;
using System.Text;
using System.Collections;

using Microsoft.SingSharp;
using Microsoft.Singularity;
using Microsoft.Singularity.Channels;
using Microsoft.Singularity.Directory;
using Microsoft.Singularity.Extending;
using Microsoft.Singularity.Io;
using Microsoft.Singularity.Memory;
using Microsoft.Singularity.Xml;

namespace Microsoft.Singularity.Loader
{
    /// <summary>
    /// This is a placeholder class for an application's manifest.
    /// At present the application manifest is represented by a hashtable.
    /// The hashtable has several important properties:
    ///  - name: the name of the application
    ///  - path: path to the application executable
    /// </summary>
    public class Manifest
    {
        /// <summary>
        /// We treat the application manifest as a collection of
        /// key, value pairs.
        /// </summary>
        private Hashtable! data = new Hashtable();
        private const string pipeContract = "Microsoft.Singularity.Io.UnicodePipeContract";

        private string name;
        private string path;
        private string publisher;
        private string[] privileges = null;

        private readonly XmlNode! applicationNode;
        private readonly XmlNode! processNode;
        private readonly XmlNode  categoriesNode;

        /// <summary>
        /// Create a manifest object from the given xml representation
        /// </summary>
        [Microsoft.Contracts.NotDelayed]
        public Manifest(byte[] xml)
        {
            Kernel.Waypoint(2600);
            XmlReader! reader = new XmlReader(xml);
            XmlNode! doc = (!)reader.Parse();
            Kernel.Waypoint(2601);

            this(doc);
        }

        [Microsoft.Contracts.NotDelayed]
        public Manifest(IoMemory memory)
        {
            Kernel.Waypoint(2600);
            XmlReader! reader = new XmlReader(memory);
            XmlNode! doc = (!)reader.Parse();
            Kernel.Waypoint(2601);

            this(doc);
        }

        [Microsoft.Contracts.NotDelayed]
        private Manifest(XmlNode! doc)
        {
            XmlNode app = (!)doc.GetChild("application");
            name = app["name"];
            publisher = app["publisher"];
            XmlNode proc = null;
            foreach (XmlNode! process in app.Children) {
                if (process.Name != "process") {
                    continue;
                }
                if (process.GetAttribute("main", "false") == "true") {
                    path = process["path"];
                    proc = process;
                    break;
                }
            }
            applicationNode = app;
            XmlNode! processNode = this.processNode = (!)proc;

            base();

            XmlNode privsNode = applicationNode.GetChild("privileges");
            if (privsNode != null) {
                int pCount = 0;
                foreach (XmlNode! privilegeNode in privsNode.Children) {
                    if (privilegeNode.Name != "privilege")
                        continue;
                    if (privilegeNode.GetAttribute("name", null) != null) {
                        pCount++;
                    }
                }
                if (pCount != 0) {
                    privileges = new string[pCount];
                    pCount = 0;
                    foreach (XmlNode! privilegeNode in privsNode.Children) {
                        if (privilegeNode.Name != "privilege")
                            continue;
                        String privilege = privilegeNode.GetAttribute("name", null);
                        if (privilege != null) {
                            privileges[pCount++] = privilege;
                        }
                    }
                }
            }

            categoriesNode = processNode.GetChild("categories");
            if (categoriesNode != null) {
                    return;
            }
#if false
            string ns = child["namespace"];
            string name = child["name"];
            string value = child["value"];

            if (name != null && value != null) {
                DataItem item = new DataItem(ns, name, value);
                data[name] = item;
            }
            else {
                throw new Exception("Invalid manifest");
            }
#endif
            Kernel.Waypoint(2602);
        }

        public object GetProperty(object! name)
        {
            return data[name];
        }

        public void SetProperty(object! name, object value)
        {
            data[name] = value;
        }

        // given an action find the corresponding category node
        public  XmlNode GetCategoryNode(string actionName) {
            if (categoriesNode == null) return null;
            if (actionName == null) {
                foreach (XmlNode! c in categoriesNode.Children) {
                    string name = c.GetAttribute("name","");
                    if (name != "console") return c;
                    bool present = c.GetAttribute("DefaultAction",false);
                    if (present) return c;
                }
                return null;
            }
            else {
                foreach (XmlNode! c in categoriesNode.Children) {
                    string a = c.GetAttribute("Action",null);
                    if (a != null && a == actionName) {
                        return c;
                    }
                }
                return null;
            }
        }

        public bool GetParameterCounts( string action,
                                        out int boolCount,
                                        out int longCount,
                                        out int stringCount,
                                        out int stringArrayCount)
        {
            XmlNode categoryNode;

            boolCount = 0;
            longCount = 0;

            stringCount = 0;
            stringArrayCount = 0;

            XmlNode boolParametersNode;
            XmlNode longParametersNode;
            XmlNode stringParametersNode;
            XmlNode stringArrayParametersNode;

            categoryNode = GetCategoryNode(action);

            if (categoryNode == null) {
                return true;
            }

            boolParametersNode = categoryNode.GetChild("BoolParameters");
            if (boolParametersNode != null) {
               boolCount = boolParametersNode.GetAttribute("length", 0);
            }

            longParametersNode = categoryNode.GetChild("LongParameters");
            if (longParametersNode != null) {
               longCount = longParametersNode.GetAttribute("length", 0);
            }

            stringParametersNode = categoryNode.GetChild("StringParameters");
            if (stringParametersNode != null) {
               stringCount = stringParametersNode.GetAttribute("length", 0);
            }

            stringArrayParametersNode = categoryNode.GetChild("StringArrayParameters");
            if (stringArrayParametersNode != null) {
               stringArrayCount = stringArrayParametersNode.GetAttribute("length", 0);
            }

            return true;

        }

        public int SetEndpoints(Process! process, string action)
        {
            // walk the XmlTree looking endpoints
            // these will be used by the binder to setup and transfer to
            // the starting process much like what is done for drivers

            XmlNode categoryNode;
            categoryNode = GetCategoryNode(action);

            if (categoryNode == null) {
#if DEBUG
                DebugStub.WriteLine("::: no category");
#endif
                return 0;
            }
            XmlNode endpoints = categoryNode.GetChild("endpoints");
            if (endpoints == null) {
                return 0;
            }
            int endpointCount = endpoints.GetAttribute("length", 0);
            if (endpointCount == 0) {
                return 0;
            }

            // now allocate memory for ep set
            process.SetEndpointCount(endpointCount);
            //DebugStub.WriteLine("Setting endpoint count to {0}", __arglist(endpointCount));
            return endpointCount;
        }

        public string Name
        {
            get {
                return name;
            }
        }

        public string Publisher
        {
            get {
                return publisher;
            }
        }

        public string Path
        {
            get {
                return path;
            }
        }

        public string[] Privileges
        {
            get {
                return privileges;
            }
        }

#if false
        public override string! ToString()
        {
            StringBuilder sb = new StringBuilder();

            sb.AppendFormat("<application name=\"{0}\">", Name);

            // the main executable
            sb.AppendFormat("<process main=\"true\" path=\"{0}\"/>", Path);

            foreach (DataItem item in data.Values) {
                if (item.Directory == null) {
                    sb.AppendFormat("<data name=\"{0}\" value=\"{1}\"/>",
                                    item.Name, item.Value);
                }
                else {
                    sb.AppendFormat("<data namespace=\"{0}\" name=\"{1}\" value=\"{2}\"/>",
                                    item.Directory, item.Name, item.Value);
                }
            }

            sb.Append("</process>");
            sb.Append("</application>");
            sb.Append("<signature>");
            sb.Append("</signature>");

            return sb.ToString();
        }

        public byte[] Serialize()
        {
            return (new UTF8Encoding()).GetBytes(ToString());
        }
#endif
    }
}