// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.

using System.Collections.ObjectModel;
using System.Management.Automation.Provider;

using Dbg = System.Management.Automation;

namespace System.Management.Automation
{
    /// <summary>
    /// Exposes the Content nouns to the Cmdlet Providers to the Cmdlet base class. The methods of this class
    /// use the providers to perform operations.
    /// </summary>
    public sealed class ContentCmdletProviderIntrinsics
    {
        #region Constructors

        /// <summary>
        /// Hide the default constructor since we always require an instance of SessionState.
        /// </summary>
        private ContentCmdletProviderIntrinsics()
        {
            Dbg.Diagnostics.Assert(
                false,
                "This constructor should never be called. Only the constructor that takes an instance of SessionState should be called.");
        }

        /// <summary>
        /// Constructs a facade over the "real" session state API.
        /// </summary>
        /// <param name="cmdlet">
        /// An instance of the cmdlet.
        /// </param>
        /// <exception cref="ArgumentNullException">
        /// If <paramref name="cmdlet"/> is null.
        /// </exception>
        internal ContentCmdletProviderIntrinsics(Cmdlet cmdlet)
        {
            if (cmdlet == null)
            {
                throw PSTraceSource.NewArgumentNullException(nameof(cmdlet));
            }

            _cmdlet = cmdlet;
            _sessionState = cmdlet.Context.EngineSessionState;
        }

        /// <summary>
        /// Constructs a facade over the "real" session state API.
        /// </summary>
        /// <param name="sessionState">
        /// An instance of the sessionState.
        /// </param>
        /// <exception cref="ArgumentNullException">
        /// If <paramref name="sessionState"/> is null.
        /// </exception>
        internal ContentCmdletProviderIntrinsics(SessionStateInternal sessionState)
        {
            if (sessionState == null)
            {
                throw PSTraceSource.NewArgumentNullException(nameof(sessionState));
            }

            _sessionState = sessionState;
        }

        #endregion Constructors

        #region Public methods

        #region GetContentReader

        /// <summary>
        /// Gets the content reader for the item at the specified path.
        /// </summary>
        /// <param name="path">
        /// The path to the item to get the content reader for.
        /// </param>
        /// <returns>
        /// The IContentReader for the item(s) at the specified path.
        /// </returns>
        /// <exception cref="ArgumentNullException">
        /// If <paramref name="path"/> is null.
        /// </exception>
        /// <exception cref="ProviderNotFoundException">
        /// If the <paramref name="path"/> refers to a provider that could not be found.
        /// </exception>
        /// <exception cref="DriveNotFoundException">
        /// If the <paramref name="path"/> refers to a drive that could not be found.
        /// </exception>
        /// <exception cref="ItemNotFoundException">
        /// If <paramref name="path"/> does not contain glob characters and
        /// could not be found.
        /// </exception>
        /// <exception cref="NotSupportedException">
        /// If the provider that the <paramref name="path"/> refers to does
        /// not support this operation.
        /// </exception>
        /// <exception cref="ProviderInvocationException">
        /// If the provider threw an exception.
        /// </exception>
        public Collection<IContentReader> GetReader(string path)
        {
            Dbg.Diagnostics.Assert(
                _sessionState != null,
                "The only constructor for this class should always set the sessionState field");

            // Parameter validation is done in the session state object

            return _sessionState.GetContentReader(new string[] { path }, false, false);
        }

        /// <summary>
        /// Gets the content reader for the item at the specified path.
        /// </summary>
        /// <param name="path">
        /// The path(s) to the item(s) to get the content reader for.
        /// </param>
        /// <param name="force">
        /// Passed on to providers to force operations.
        /// </param>
        /// <param name="literalPath">
        /// If true, globbing is not done on paths.
        /// </param>
        /// <returns>
        /// The IContentReader for the item(s) at the specified path.
        /// </returns>
        /// <exception cref="ArgumentNullException">
        /// If <paramref name="path"/> is null.
        /// </exception>
        /// <exception cref="ProviderNotFoundException">
        /// If the <paramref name="path"/> refers to a provider that could not be found.
        /// </exception>
        /// <exception cref="DriveNotFoundException">
        /// If the <paramref name="path"/> refers to a drive that could not be found.
        /// </exception>
        /// <exception cref="ItemNotFoundException">
        /// If <paramref name="path"/> does not contain glob characters and
        /// could not be found.
        /// </exception>
        /// <exception cref="NotSupportedException">
        /// If the provider that the <paramref name="path"/> refers to does
        /// not support this operation.
        /// </exception>
        /// <exception cref="ProviderInvocationException">
        /// If the provider threw an exception.
        /// </exception>
        public Collection<IContentReader> GetReader(string[] path, bool force, bool literalPath)
        {
            Dbg.Diagnostics.Assert(
                _sessionState != null,
                "The only constructor for this class should always set the sessionState field");

            // Parameter validation is done in the session state object

            return _sessionState.GetContentReader(path, force, literalPath);
        }

        /// <summary>
        /// </summary>
        /// <param name="path">
        /// </param>
        /// <param name="context">
        /// </param>
        /// <returns>
        /// </returns>
        /// <exception cref="ArgumentNullException">
        /// If <paramref name="path"/> is null.
        /// </exception>
        /// <exception cref="ProviderNotFoundException">
        /// If the <paramref name="path"/> refers to a provider that could not be found.
        /// </exception>
        /// <exception cref="DriveNotFoundException">
        /// If the <paramref name="path"/> refers to a drive that could not be found.
        /// </exception>
        /// <exception cref="ItemNotFoundException">
        /// If <paramref name="path"/> does not contain glob characters and
        /// could not be found.
        /// </exception>
        /// <exception cref="NotSupportedException">
        /// If the provider that the <paramref name="path"/> refers to does
        /// not support this operation.
        /// </exception>
        /// <exception cref="ProviderInvocationException">
        /// If the provider threw an exception.
        /// </exception>
        internal Collection<IContentReader> GetReader(
            string path,
            CmdletProviderContext context)
        {
            Dbg.Diagnostics.Assert(
                _sessionState != null,
                "The only constructor for this class should always set the sessionState field");

            // Parameter validation is done in the session state object

            return _sessionState.GetContentReader(new string[] { path }, context);
        }

        /// <summary>
        /// Gets the dynamic parameters for the get-content cmdlet.
        /// </summary>
        /// <param name="path">
        /// The path to the item if it was specified on the command line.
        /// </param>
        /// <param name="context">
        /// The context which the core command is running.
        /// </param>
        /// <returns>
        /// An object that has properties and fields decorated with
        /// parsing attributes similar to a cmdlet class.
        /// </returns>
        /// <exception cref="ProviderNotFoundException">
        /// If the <paramref name="path"/> refers to a provider that could not be found.
        /// </exception>
        /// <exception cref="DriveNotFoundException">
        /// If the <paramref name="path"/> refers to a drive that could not be found.
        /// </exception>
        /// <exception cref="ItemNotFoundException">
        /// If <paramref name="path"/> does not contain glob characters and
        /// could not be found.
        /// </exception>
        /// <exception cref="NotSupportedException">
        /// If the provider that the <paramref name="path"/> refers to does
        /// not support this operation.
        /// </exception>
        /// <exception cref="ProviderInvocationException">
        /// If the provider threw an exception.
        /// </exception>
        internal object GetContentReaderDynamicParameters(
            string path,
            CmdletProviderContext context)
        {
            Dbg.Diagnostics.Assert(
                _sessionState != null,
                "The only constructor for this class should always set the sessionState field");

            // Parameter validation is done in the session state object

            return _sessionState.GetContentReaderDynamicParameters(path, context);
        }

        #endregion GetContentReader

        #region GetContentWriter

        /// <summary>
        /// Gets the content writer for the item(s) at the specified path.
        /// </summary>
        /// <param name="path">
        /// The path to the item(s) to get the content writer for.
        /// </param>
        /// <returns>
        /// The IContentWriter for the item(s) at the specified path.
        /// </returns>
        /// <exception cref="ArgumentNullException">
        /// If <paramref name="path"/> is null.
        /// </exception>
        /// <exception cref="ProviderNotFoundException">
        /// If the <paramref name="path"/> refers to a provider that could not be found.
        /// </exception>
        /// <exception cref="DriveNotFoundException">
        /// If the <paramref name="path"/> refers to a drive that could not be found.
        /// </exception>
        /// <exception cref="ItemNotFoundException">
        /// If <paramref name="path"/> does not contain glob characters and
        /// could not be found.
        /// </exception>
        /// <exception cref="NotSupportedException">
        /// If the provider that the <paramref name="path"/> refers to does
        /// not support this operation.
        /// </exception>
        /// <exception cref="ProviderInvocationException">
        /// If the provider threw an exception.
        /// </exception>
        public Collection<IContentWriter> GetWriter(string path)
        {
            Dbg.Diagnostics.Assert(
                _sessionState != null,
                "The only constructor for this class should always set the sessionState field");

            // Parameter validation is done in the session state object

            return _sessionState.GetContentWriter(new string[] { path }, false, false);
        }

        /// <summary>
        /// Gets the content writer for the item(s) at the specified path.
        /// </summary>
        /// <param name="path">
        /// The path(s) to the item(s) to get the content writer for.
        /// </param>
        /// <param name="force">
        /// Passed on to providers to force operations.
        /// </param>
        /// <param name="literalPath">
        /// If true, globbing is not done on paths.
        /// </param>
        /// <returns>
        /// The IContentWriter for the item(s) at the specified path.
        /// </returns>
        /// <exception cref="ArgumentNullException">
        /// If <paramref name="path"/> is null.
        /// </exception>
        /// <exception cref="ProviderNotFoundException">
        /// If the <paramref name="path"/> refers to a provider that could not be found.
        /// </exception>
        /// <exception cref="DriveNotFoundException">
        /// If the <paramref name="path"/> refers to a drive that could not be found.
        /// </exception>
        /// <exception cref="ItemNotFoundException">
        /// If <paramref name="path"/> does not contain glob characters and
        /// could not be found.
        /// </exception>
        /// <exception cref="NotSupportedException">
        /// If the provider that the <paramref name="path"/> refers to does
        /// not support this operation.
        /// </exception>
        /// <exception cref="ProviderInvocationException">
        /// If the provider threw an exception.
        /// </exception>
        public Collection<IContentWriter> GetWriter(string[] path, bool force, bool literalPath)
        {
            Dbg.Diagnostics.Assert(
                _sessionState != null,
                "The only constructor for this class should always set the sessionState field");

            // Parameter validation is done in the session state object

            return _sessionState.GetContentWriter(path, force, literalPath);
        }

        /// <summary>
        /// </summary>
        /// <param name="path">
        /// </param>
        /// <param name="context">
        /// </param>
        /// <returns>
        /// </returns>
        /// <exception cref="ArgumentNullException">
        /// If <paramref name="path"/> is null.
        /// </exception>
        /// <exception cref="ProviderNotFoundException">
        /// If the <paramref name="path"/> refers to a provider that could not be found.
        /// </exception>
        /// <exception cref="DriveNotFoundException">
        /// If the <paramref name="path"/> refers to a drive that could not be found.
        /// </exception>
        /// <exception cref="ItemNotFoundException">
        /// If <paramref name="path"/> does not contain glob characters and
        /// could not be found.
        /// </exception>
        /// <exception cref="NotSupportedException">
        /// If the provider that the <paramref name="path"/> refers to does
        /// not support this operation.
        /// </exception>
        /// <exception cref="ProviderInvocationException">
        /// If the provider threw an exception.
        /// </exception>
        internal Collection<IContentWriter> GetWriter(
            string path,
            CmdletProviderContext context)
        {
            Dbg.Diagnostics.Assert(
                _sessionState != null,
                "The only constructor for this class should always set the sessionState field");

            // Parameter validation is done in the session state object

            return _sessionState.GetContentWriter(new string[] { path }, context);
        }

        /// <summary>
        /// Gets the dynamic parameters for the set-content and add-content cmdlet.
        /// </summary>
        /// <param name="path">
        /// The path to the item if it was specified on the command line.
        /// </param>
        /// <param name="context">
        /// The context which the core command is running.
        /// </param>
        /// <returns>
        /// An object that has properties and fields decorated with
        /// parsing attributes similar to a cmdlet class.
        /// </returns>
        /// <exception cref="ProviderNotFoundException">
        /// If the <paramref name="path"/> refers to a provider that could not be found.
        /// </exception>
        /// <exception cref="DriveNotFoundException">
        /// If the <paramref name="path"/> refers to a drive that could not be found.
        /// </exception>
        /// <exception cref="ItemNotFoundException">
        /// If <paramref name="path"/> does not contain glob characters and
        /// could not be found.
        /// </exception>
        /// <exception cref="NotSupportedException">
        /// If the provider that the <paramref name="path"/> refers to does
        /// not support this operation.
        /// </exception>
        /// <exception cref="ProviderInvocationException">
        /// If the provider threw an exception.
        /// </exception>
        internal object GetContentWriterDynamicParameters(
            string path,
            CmdletProviderContext context)
        {
            Dbg.Diagnostics.Assert(
                _sessionState != null,
                "The only constructor for this class should always set the sessionState field");

            // Parameter validation is done in the session state object

            return _sessionState.GetContentWriterDynamicParameters(path, context);
        }

        #endregion GetContentWriter

        #region ClearContent

        /// <summary>
        /// Clears the content from the item(s) specified by the path.
        /// </summary>
        /// <param name="path">
        /// The path to the item(s) to clear the content from.
        /// </param>
        /// <exception cref="ArgumentNullException">
        /// If <paramref name="path"/> is null.
        /// </exception>
        /// <exception cref="ProviderNotFoundException">
        /// If the <paramref name="path"/> refers to a provider that could not be found.
        /// </exception>
        /// <exception cref="DriveNotFoundException">
        /// If the <paramref name="path"/> refers to a drive that could not be found.
        /// </exception>
        /// <exception cref="ItemNotFoundException">
        /// If <paramref name="path"/> does not contain glob characters and
        /// could not be found.
        /// </exception>
        /// <exception cref="NotSupportedException">
        /// If the provider that the <paramref name="path"/> refers to does
        /// not support this operation.
        /// </exception>
        /// <exception cref="ProviderInvocationException">
        /// If the provider threw an exception.
        /// </exception>
        public void Clear(string path)
        {
            Dbg.Diagnostics.Assert(
                _sessionState != null,
                "The only constructor for this class should always set the sessionState field");

            // Parameter validation is done in the session state object

            _sessionState.ClearContent(new string[] { path }, false, false);
        }

        /// <summary>
        /// Clears the content from the item(s) specified by the path.
        /// </summary>
        /// <param name="path">
        /// The path(s) to the item(s) to clear the content from.
        /// </param>
        /// <param name="force">
        /// Passed on to providers to force operations.
        /// </param>
        /// <param name="literalPath">
        /// If true, globbing is not done on paths.
        /// </param>
        /// <exception cref="ArgumentNullException">
        /// If <paramref name="path"/> is null.
        /// </exception>
        /// <exception cref="ProviderNotFoundException">
        /// If the <paramref name="path"/> refers to a provider that could not be found.
        /// </exception>
        /// <exception cref="DriveNotFoundException">
        /// If the <paramref name="path"/> refers to a drive that could not be found.
        /// </exception>
        /// <exception cref="ItemNotFoundException">
        /// If <paramref name="path"/> does not contain glob characters and
        /// could not be found.
        /// </exception>
        /// <exception cref="NotSupportedException">
        /// If the provider that the <paramref name="path"/> refers to does
        /// not support this operation.
        /// </exception>
        /// <exception cref="ProviderInvocationException">
        /// If the provider threw an exception.
        /// </exception>
        public void Clear(string[] path, bool force, bool literalPath)
        {
            Dbg.Diagnostics.Assert(
                _sessionState != null,
                "The only constructor for this class should always set the sessionState field");

            // Parameter validation is done in the session state object

            _sessionState.ClearContent(path, force, literalPath);
        }

        /// <summary>
        /// Clears the content from the specified item(s)
        /// </summary>
        /// <param name="path">
        /// The path to the item(s) to clear the content from.
        /// </param>
        /// <param name="context">
        /// The context under which the command is running.
        /// </param>
        /// <exception cref="ArgumentNullException">
        /// If <paramref name="path"/> is null.
        /// </exception>
        /// <exception cref="ProviderNotFoundException">
        /// If the <paramref name="path"/> refers to a provider that could not be found.
        /// </exception>
        /// <exception cref="DriveNotFoundException">
        /// If the <paramref name="path"/> refers to a drive that could not be found.
        /// </exception>
        /// <exception cref="ItemNotFoundException">
        /// If <paramref name="path"/> does not contain glob characters and
        /// could not be found.
        /// </exception>
        /// <exception cref="NotSupportedException">
        /// If the provider that the <paramref name="path"/> refers to does
        /// not support this operation.
        /// </exception>
        /// <exception cref="ProviderInvocationException">
        /// If the provider threw an exception.
        /// </exception>
        internal void Clear(string path, CmdletProviderContext context)
        {
            Dbg.Diagnostics.Assert(
                _sessionState != null,
                "The only constructor for this class should always set the sessionState field");

            // Parameter validation is done in the session state object

            _sessionState.ClearContent(new string[] { path }, context);
        }

        /// <summary>
        /// Gets the dynamic parameters for the clear-content cmdlet.
        /// </summary>
        /// <param name="path">
        /// The path to the item if it was specified on the command line.
        /// </param>
        /// <param name="context">
        /// The context which the core command is running.
        /// </param>
        /// <returns>
        /// An object that has properties and fields decorated with
        /// parsing attributes similar to a cmdlet class.
        /// </returns>
        /// <exception cref="ProviderNotFoundException">
        /// If the <paramref name="path"/> refers to a provider that could not be found.
        /// </exception>
        /// <exception cref="DriveNotFoundException">
        /// If the <paramref name="path"/> refers to a drive that could not be found.
        /// </exception>
        /// <exception cref="ItemNotFoundException">
        /// If <paramref name="path"/> does not contain glob characters and
        /// could not be found.
        /// </exception>
        /// <exception cref="NotSupportedException">
        /// If the provider that the <paramref name="path"/> refers to does
        /// not support this operation.
        /// </exception>
        /// <exception cref="ProviderInvocationException">
        /// If the provider threw an exception.
        /// </exception>
        internal object ClearContentDynamicParameters(string path, CmdletProviderContext context)
        {
            Dbg.Diagnostics.Assert(
                _sessionState != null,
                "The only constructor for this class should always set the sessionState field");

            // Parameter validation is done in the session state object

            return _sessionState.ClearContentDynamicParameters(path, context);
        }

        #endregion ClearContent

        #endregion Public methods

        #region private data

        private Cmdlet _cmdlet;
        private SessionStateInternal _sessionState;

        #endregion private data
    }
}

